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  • 1.
    Acuña, G. J.
    et al.
    Facultad de Ingeniería Sanitaria y Ambiental, Universidad Pontificia Bolivariana, Montería, Colombia.
    Berger, M.
    University of Liège, Dept. of Electrical Engineering and Computer Science, Liege, Belgium.
    Campana, Pietro Elia
    Mälardalens universitet, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Campos, R. A.
    Universidade Federal De Santa Catarina, Departamento De Engenharia Civil, Florianopolis, Brazil.
    Canales, F. A.
    Department of Civil and Environmental, Universidad de la Costa, Barranquilla, Colombia.
    Cantor, D.
    Universidad Nacional De Colombia, Sede Medellín, Medellin, Colombia.
    Ciapała, B.
    AGH University of Science and Technology, Department of Fossil Fuels, Centre for Sustainable Development and Energy Efficiency, Krakow, Poland.
    Cioccolanti, L.
    eCampus University, Centro di Ricerca per l’Energia, l’Ambiente e il Territorio, Via Isimbardi 10, Novedrate, Italy.
    De Felice, M.
    European Commission, Joint Research Centre, Petten, Netherlands.
    de Oliveira Costa Souza Rosa, C.
    European Commission, Joint Research Centre, Petten, Netherlands.
    Teaching about complementarity - proposal of classes for university students - including exercises2022Ingår i: Complementarity of Variable Renewable Energy Sources, Elsevier , 2022, s. 687-713Kapitel i bok, del av antologi (Övrigt vetenskapligt)
    Abstract [en]

    The idea behind this chapter is to provide teachers and students with material that can be used while studying renewable energy sources with special attention paid to their complementary characteristics. The questions and exercises included below refer to chapters presented in the book. In case of any questions, we provide the readers with contact details to chapters corresponding authors who would be happy in assisting you in case of any queries.

  • 2.
    Anbalagan, Anbarasan
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    A passage to wastewater nutrient recovery units: Microalgal-Bacterial bioreactors2018Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    In recent years, the microalgal–bacterial process has been considered to be a very attractive engineering solution for wastewater treatment. However, it has not been widely studied in the context of conventional wastewater treatment design under Swedish conditions. The technology holds several advantages: as a CO2 sink, ability to withstand cold conditions, ability to grow under low light, fast settling without chemical precipitation, and reducing the loss of valuable nutrients (CO2, N2, N2O, PO4). The process also provides the option to be operated either as mainstream (treatment of municipal wastewater) or side stream (treatment of centrate from anaerobic digesters) to reduce the nutrient load of the wastewater. Furthermore, the application is not only limited to wastewater treatment; the biomass can be used to synthesise platform chemicals or biofuels and can be followed by recovery of ammonium and phosphate for use in agriculture.

    In the present study, the feasibility of applying the process in Swedish temperature and light conditions was investigated by implementing microalgae within the activated sludge process. In this context, the supporting operational and performance indicators (hydraulic retention time (HRT), sludge retention time (SRT) and nutrients removal) were evaluated to support naturally occurring consortia in photo-sequencing and continuous bioreactor configuration. Furthermore, CO2 uptake and light spectrum-mediated nutrient removal were investigated to reduce the impact on climate and the technical challenges associated with this type of system.

    The results identified effective retention times of 6 and 4 days (HRT = SRT) under limited lighting to reduce the electrical consumption. From the perspective of nitrogen removal, the process demands effective CO2 input either in the mainstream or side stream treatment. The incorporation of a vertical absorption column demonstrated effective CO2 mass transfer to support efficient nitrogen and phosphorus removal as a side stream treatment. However, the investigation of a continuous single-stage process as the mainstream showed a requirement for a lower SRT in comparison to semi-continuous operation due to faster settlability, regardless of inorganic carbon. Furthermore, the process showed an effective reduction of influent phosphorus and organic compounds (i.e. COD/TOC) load in the wastewater as a result of photosynthetic aeration. Most importantly, the operation was stable at the temperature equivalent of wastewater (12 and 13 ˚C), under different lighting (white, and red-blue wavelengths) and retention times (6 and 1.5 d HRT) with complete nitrification. Additionally, the biomass production was stable with faster settling properties without any physiochemical separation.

    The outcomes of this thesis on microalgal–bacterial nutrient removal demonstrates that (1) photosynthesis-based aeration at existing wastewater conditions under photo-sequential and continuous photobioreactor setup, (2) flocs with rapid settling characteristics at all studied retention times, (3) the possibility of increasing carbon supplementation to achieve higher carbon to nitrogen balance in the photobioreactor, and (4) most importantly, nitrification-based microalgal biomass uptake occurred at all spectral distributions, lower photosynthetic active radiation and existing wastewater conditions.

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  • 3.
    Andersson, Henny
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Thorin, Eva
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Lindmark, Johan
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Schwede, Sebastian
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Jansson, Joakim
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Suhonen, Anssi
    Savonia University of Applied Sciences.
    Jääskeläinen, Ari
    Savonia University of Applied Sciences.
    Reijonen, Tero
    Savonia University of Applied Sciences.
    Laatikainen, Reino
    University of Eastern Finland.
    Heitto, Anneli
    Finnoflag.
    Hakalehto, Elias
    Finnoflag.
    Technical Output Report – Pilot A in Sweden2014Rapport (Övrigt vetenskapligt)
  • 4.
    Bergenheim, Veronica
    Mälardalens högskola, Institutionen för biologi och kemiteknik.
    Effects of nicotine on GABAA subunit expression in the rat brain2007Studentuppsats
    Abstract [en]

    Smoking is a worldwide problem and it is the second major cause of death. People often try to quit, but few succeed mainly because of withdrawal symptoms such as irritability, anxiety, increased appetite, hyperventilation and difficulty concentrating.

    The overall aim of this project was to study neurochemical changes in the brain following sensitization to nicotine which could give more information about what causes an individual to go from using drugs to abusing the drugs. Therefore, we investigated messenger ribonucleic acid (mRNA) expression of several genes known to be involved in the mesolimbic dopamine pathway in the nucleus accumbens, caudate putamen, prefrontal cortex and medial prefrontal cortex using real-time polymerase chain reaction (real-time PCR).

    The results showed that in the nucleus accumbens, mRNA expression of gamma-aminobutyric acid (GABA) Aα1 subunit receptor and GABA transporter 3 (GAT-3) were significantly increased following nicotine administration, while in the caudate putamen no difference in expression was observed. In prefrontal cortex, the expression of adrenergic subunit receptor α2A was significantly increased following hexamethonium administration. In medial prefrontal cortex a significant decrease of expression of GAT-1 was shown following nicotine and hexamethonium administration, while a decrease of CART expression only was shown following nicotine administration.

    Overall, these changes in the GABA system may help to explain the mechanism of nicotine sensitization.

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  • 5.
    Björklund, Stefan
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Microtubule associated proteins 1B and 1S: interactions with NR1 and NR3A2008Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats
    Abstract [en]

     

    In previous studies the carboxyl-terminus of microtubule-associated protein 1S was shown to interact with the N-methyl-D-aspartate receptor subunit NR3A (Eriksson et. al.)1.  In this study, interactions between three truncations of the microtubule-associated proteins 1B and one truncation of the microtubule-associated protein 1S carboxyl-terminus and the N-methyl-D-aspartate receptor subunits NR1 and NR3A were examined. The study showed that an interaction occurred between amino acids 2167 to 2365 of the microtubule-associated protein 1B and NR3A.  That region of microtubule associated protein 1B corresponds to a microtubule-binding region in the light chain. It has been shown in earlier studies (Reviewed in Halpain S. et a12, Riederer, BM.  et.al3.) that the light chain is a active part of the protein that have been post translational cleaved. The MAP 1 proteins are present in all tissue but has higher concentrations in the Post Synaptic Density of neurons in the central nervous system.  The N-methyl-D-aspartate receptors are present in glial cells and in the dendritic shafts of the central nervous system neurons (Eriksson et. al.)1 . The diseases were these proteins may play a part is mainly memory destructive diseases such as Alzheimers disease and in muscular dystrophy, but these assumptions are still being speculated.

     

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  • 6.
    Chabo, Ablahad
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling. Mälardalens högskola, Institutionen för biologi och kemiteknik.
    Treatment of a mantle cell lymphoma cell line with cannabinoids and cytostatics: - effects on DNA synthesis and ceramide metabolism2009Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Mantle cell lymphoma (MCL) is an aggressive B-cell malignancy with bad prognosis, which predominates in males with advanced age. However, studies of the endocannabinoid system and how it affects tumour behaviour provides the basis for designing innovative therapeutic strategies that could open new opportunities for treatment of patient with MCL. It has earlier been shown that the cannabinoid receptor ligand (R)-(+)-methanandamide (R-MA) induce cell death in MCL by accumulation of ceramide. Ceramide has a pro-apoptotic effect on the cell but could be metabolized by the enzymes glucosylceramide synthase (GCS) and sphingosine kinase 1 (SphK1) to molecules with pro-proliferative effect. Therefore, treatments with R-MA on Jeko-1 MCL cell line were performed in this study to determine interference in the proliferative behaviour as well as in the gene expression of the enzymes GCS and SphK1. In addition, treatments with chemotherapeutic substances, such as doxorubicin or cytarabine (Ara-C), and combinations of R-MA and chemotherapeutic substance, were performed for the same reason. Results showed that the proliferation behaviour of Jeko cells remained unaffected when treated with R-MA, in contrast to the decreased proliferative effects shown when treated with cytostatics or combinations of R-MA and cytostatics. Furthermore, a tendency for up-regulation of GCS and SphK1 expression was recognized when cells were treated with cytostatics or combination of cytostatics and R-MA, in contrast to cells treated with R-MA alone. Although, R-MA alone had a tendency for a small down-regulation of GCS expression, it contributed to a potential elevation of GCS expression when combined with Ara-C or doxorubicin. It is believed that the effect from upregulated levels of the metabolizing enzymes GCS and SphK1 is balanced by, earlier observed, up-regulations of the ceramide synthesis enzymes.

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  • 7.
    Chen, Haoqian
    et al.
    Qingdao Univ, Coll Comp Sci & Technol, Ningxia Rd 308, Qingdao 266071, Peoples R China..
    Sui, Yi
    Qingdao Univ, Coll Comp Sci & Technol, Ningxia Rd 308, Qingdao 266071, Peoples R China.;Univ Tokyo, Ctr Spatial Informat Sci, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778568, Japan..
    Shang, Wen-long
    Beijing Univ Technol, Coll Metropolitan Transportat, Beijing Key Lab Traff Engn, Beijing 100124, Peoples R China.;Beijing Jiao Tong Univ, Sch Traff & Transportat, Beijing 100044, Peoples R China..
    Sun, Rencheng
    Qingdao Univ, Coll Comp Sci & Technol, Ningxia Rd 308, Qingdao 266071, Peoples R China..
    Chen, Zhiheng
    Univ Tokyo, Ctr Spatial Informat Sci, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778568, Japan..
    Wang, Changying
    Qingdao Univ, Coll Comp Sci & Technol, Ningxia Rd 308, Qingdao 266071, Peoples R China..
    Han, Chunjia
    Birkbeck Univ London, Dept Management, London WC1E 7HX, England..
    Zhang, Yuqian
    China Inst Marine Human Factors Engn, Yingshanhong Rd 117, Qingdao 266400, Peoples R China..
    Zhang, Haoran
    Mälardalens universitet, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Univ Tokyo, Ctr Spatial Informat Sci, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778568, Japan.
    Towards renewable public transport: Mining the performance of electric buses using solar-radiation as an auxiliary power source2022Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 325, artikel-id 119863Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Transforming the road public transport to run on renewable energy is vital solution to achieve carbon neutral and net zero goals. This paper evaluates the potential of using solar radiation-generated electricity as an auxiliary power supplementary for the battery of electric buses, based on a developed framework that using publicly street-view panoramas, GPS trajectory data and DEM data as input parameters of solar radiation model. A case study of Qingdao, China with 547 bus routes, 28,661 street-view panoramas shows that the solar-radiation electricity generated at noon during the operation accounts for about one-fifth, one-eighth of the total elec-tricity consumption of a bus traveling one kilometer in a sunny day and a cloudy day, respectively. Spatial variability shows significant solar-radiation power generation advantages in newly-launched areas and expressway. The solar power generated in a sunny day can make a bus half of passengers and with air conditioner off at least one extra trip in 2:1 replacement schedule, and nearly close to one extra trip in 4:3 replacement schedule. A correlated relation between the solar-radiation power generation benefit and the operation schedule of electric buses is observed, implying that the high cost of 2:1 replacement schedule for long-distance routes during summer or winter can be reduced. The proposed framework can help us evaluate and understand the feasibility of solar radiation-generated electricity energy of electric bus fleets covering the large-scale urban areas at different times, locations, and weather conditions, so as to support effective decisions at better planning of PV-integrated electric buses.

  • 8.
    Daianova, Lilia
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik.
    Thorin, Eva
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik.
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik.
    Dotzauer, Erik
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik.
    Locally produced bioethanol for a regional self-sufficient transport fuel system2009Konferensbidrag (Refereegranskat)
  • 9.
    de Maré, L
    et al.
    Lund Institute of Technology, Sweden.
    Velut, S
    Lund Institute of Technology, Sweden.
    Ledung, Erika
    Mälardalens högskola, Institutionen för biologi och kemiteknik.
    Cimander, C
    Novozymes Biopharma AB, Lund, Sweden .
    Norrman, Bo
    Mälardalens högskola, Institutionen för biologi och kemiteknik.
    Karlsson, E
    Lund Institute of Technology, Lund, Sweden.
    Holst, O
    Lund Institute of Technology, Lund, Sweden.
    Hagander, P
    Lund Institute of Technology, Sweden.
    A cultivation technique for E. coli fed-batch cultivations operating close to the maximum oxygen transfer capacity of the reactor2005Ingår i: Biotechnology Letters, ISSN 0141-5492, Vol. 27, nr 14, s. 983-990Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A cultivation strategy combining the advantages of temperature-limited fed-batch and probing feeding control is presented. The technique was evaluated in fed-batch cultivations with E. coli BL21(DE3) producing xylanase in a 3 liter bioreactor. A 20% increase in cell mass was achieved and the usual decrease in specific enzyme activity normally observed during the late production phase was diminished with the new technique. The method was further tested by growing E. coli W3110 in a larger bioreactor (50 l). It is a suitable cultivation technique when the O2 transfer capacity of the reactor is reached and it is desired to continue to produce the recombinant protein.

  • 10.
    Huopana, Tuomas
    et al.
    University of Eastern Finland, Finland.
    Niska, Harri
    University of Eastern Finland, Finland.
    Kolehmainen, Mikko
    University of Eastern Finland, Finland.
    Jääskeläinen, Ari
    Savonia University of Applied Sciences, Finland.
    Antikainen, Eero
    Savonia University of Applied Sciences, Finland.
    Schwede, Sebastian
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Thorin, Eva
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Klintenberg, Patrik
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Hakalehto, Elias
    Finnoflag, Finland.
    Ahrens, Thorsten
    Ostfalia University of Applied Sciences, Germany.
    Sustainability assessment of biorefinery and dry digestion systems: Case:Sweden2014Rapport (Övrigt vetenskapligt)
  • 11.
    Huopanaa, Tuomas
    et al.
    University of Eastern Finland.
    Niska, Harri
    University of Eastern Finland.
    Jääskeläinen, Ari
    Savonia University of Appled Sciences, Finland.
    Lõõnik, Jaan
    Estonian Regional and Local Development Agency, Estland.
    den Boer, Emilia
    Wroclaw University of Technology, Polen.
    Song, Han
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik. Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Thorin, Eva
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik. Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    A REGIONAL MODEL FOR SUSTAINABLE BIOGAS  PRODUCTION: Case study: North Savo, Finland. REMOWE Report, Integrated report no: O5.3.3, O5.3.6, O5.4.3, O5.4.4, O5.6.12012Rapport (Refereegranskat)
  • 12.
    Johansson, LarsErik
    et al.
    Mälardalens högskola, Institutionen för biologi och kemiteknik.
    Aldaeus, F
    Royal Institute of Technology, Sweden.
    Jonsson, G
    Mälardalens högskola, Institutionen för matematik och fysik.
    Hamp, S
    Mälardalens högskola, Institutionen för biologi och kemiteknik.
    Roeraade, J
    Royal Institute of Technology, Sweden.
    Determination of conductivity of bacteria by using cross-flow filtration2006Ingår i: Biotechnology letters, ISSN 0141-5492, E-ISSN 1573-6776, Vol. 28, nr 8, s. 601-603Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An important property of the bacterial surface is its conductivity. To obtain reliable conductivity values, it is essential to handle the cells as gently as possible during the measurement procedure. We have developed a method where a standard conductivity meter is used in combination with cross-flow filtration, thus avoiding repeated centrifugation and resuspension. With this method, the conductivity of Bacillus subtilis was determined to be 7000 mu S/cm, which is a deviation from previously published data by almost an order of a magnitude.

  • 13.
    Jonfelt, Clara
    et al.
    Uppsala University, Sweden.
    Zambrano, Jesús
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Lindblom, Erik
    Stockholm Vatten, Sweden.
    Nehrenheim, Emma
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Key parameters for modelling Anammox process with N2O emissions2017Ingår i: French Federation of Biotechnology - Bioreactors Symposium 2017: Innovative approaches in bioreactors design and operation, France, 2017Konferensbidrag (Refereegranskat)
    Abstract [en]

    In this paper, a sensitivity analysis and a calibration were applied to a recent published model used to replicate N2O emissions in an Anammox process of a moving-bed biofilm reactor (MBBR). The model used in this study was designed to replicate a one-stage nitrification-Anammox system in a MBBR at Hammarby-Sjöstad pilot plant (Stockholm, Sweden), whichtreats of anaerobic digestion liquor. The aeration was intermittently (45/15 minutes - on/off). During the aeration, a 1.5 mg/L DO set-point was set. Three main measurements wereobtained: NH4 in water, N2O in both water and gas phase.The sensitivity analysis was done via the one-at-a-time method, where one parameter at a timeis changed (in our case, 10%) from its nominal value and the model output is quantified. Next,the most sensitive parameters were used in the model calibration. Results indicate that the biofilm porosity (η [-]), biofilm density (ρ [gTS/m3]), maximum biofilmthickness (Lmax [mm]) and boundary layer thickness of the biofilm (L0 [μm]) were the mostsensitive parameters of the model. These parameters performed the model calibration.

  • 14.
    Larsericsdotter, Helén
    et al.
    Mälardalens högskola, Institutionen för biologi och kemiteknik.
    Oscarsson, Sven
    Mälardalens högskola, Institutionen för biologi och kemiteknik.
    Buijs, Jos
    Mälardalens högskola, Institutionen för biologi och kemiteknik. Uppsala University,, Sweden.
    Thermodynamic Analysis of Proteins Adsorbed on Silica Particles: Electrostatic Effects.2001Ingår i: Journal of colloid and interface science, ISSN 0021-9797, Vol. 237, nr 1, s. 98-103Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Electrostatic effects on protein adsorption were investigated using differential scanning calorimetry (DSC) and adsorption isotherms. The thermal denaturation of lysozyme, ribonuclease A (RNase), and alpha-lactalbumin in solution and adsorbed onto silica nanoparticles was examined at three concentrations of cations: 10 and 100 mM of sodium and 100 mM of sodium to which 10 mM of calcium was added. The parameters investigated were the denaturation enthalpy (DeltaH), the temperature at which the denaturation transition was half-completed (T(m)), and the temperature range of the denaturation transition. For lysozyme and RNase, adsorption isotherms depend strongly on the ionic strength. At low ionic strength both proteins have a high affinity for the silica particles and adsorption is accompanied by a 15-25% reduction in DeltaH and a 3-6 degrees C decrease in T(m), indicating that the adsorbed state of the proteins is destabilized. Also, an increase in the width of the denaturation transition is observed, signifying a larger conformational heterogeneity of the surface bound proteins. At higher ionic strengths, both with and without the addition of calcium, no significant adsorption-induced alteration in DeltaH was observed for all three proteins. The addition of calcium, however, decreases the width of the denaturation transition for lysozyme and RNase in the adsorbed state.

  • 15.
    Lindmark, Johan
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik. Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Developing the anaerobic digestion process through technology integration2014Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    Process optimization is needed for the development and expansion of the biogas industry and to meet the ever growing demand for methane. This thesis explores process technologies for the development of the anaerobic digestion process and includes pre-treatments, studies on the effects of different mixing modes and evaluation of a water treatment technology.

    Two pre-treatments were evaluated, mechanical and electroporation, for treatment of ley crop silage. Mechanical treatment included two milling machines designed for recycling of paper, Grubben deflaker and Krima disperser, and showed an increased biogas production of 59 % and 43 % respectively as well as a positive energy balance and economic results.. Electroporation increased the biogas production with 16 %, however, development is needed to increase its energy efficiency.

    Digester mixing has an effect on the digestion result. The performed review and experiments show that the mixing demand increases with organic loading. Excessive mixing during process start up, instabilities and shock loads leads to increased volatile fatty acid concentrations and process inhibition. Reduction of mixing reduces the effects of process instabilities and periodical mixing with mixing breaks has been shown to be beneficial for biogas production.

    A high temperature membrane filtration unit was evaluated at 70 °C, 90 °C and 110 °C to determine separation efficiencies, permeation speed when treating process water at a biogas plant.  Improved separation can increase the capacity of the substrate pre-processing and reduce process related problems. The results show a total solids separation of 60 %, and an increasing filtration speed with temperature with fluxes of between 113 and 464 L/ h m2. The substrate pre-processing could theoretically handle up to 29 % more substrate as a result.

    Integration of these technologies in a biogas plant show that the pre-treatments studied exhibits a good performance when integrated and that mixing reduction has the potential to lower the process electricity demand by 23 % in the performed case study. However, even though the membrane filtration unit shows promising results it would demand a relatively high energy consumption and lead to limited benefits to a process already at it maximum organic loading.

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  • 16.
    Lindmark, Johan
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Lagerkvist, Anders
    Division of Waste Science and Technology, Luleå University of Technology, Luleå, Sweden.
    Nilsson, Erik
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Carlsson, My
    AnoxKaldnes AB, Lund, Sweden.
    Thorin, Eva
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Dahlquist, Erik
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Evaluating the effects of electroporation pre-treatment on the biogas yield from ley crop silage.2014Ingår i: Applied Biochemistry and Biotechnology, ISSN 0273-2289, E-ISSN 1559-0291, Vol. 174, nr 7, s. 2616-2625Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Exploiting the full biogas potential of some types of biomass is challenging. The complex structures of lignocellulosic biomass are difficult to break down and thus require longer retention times for the nutrients to become biologically available. It is possible to increase the digestibility of the substrate by pre-treating the material before digestion. This paper explores a pre-treatment of ley crop silage that uses electrical fields, known as electroporation (EP). Different settings of the EP equipment were tested, and the results were analyzed using a batch digestion setup. The results show that it is possible to increase the biogas yield with 16 % by subjecting the substrates to 65 pulses at a field strength of 96 kV/cm corresponding to a total energy input of 259 Wh/kg volatile solid (VS). However, at 100 pulses, a lower field strength of 48 kV/cm and the same total energy input, no effects of the treatment were observed. The energy balance of the EP treatment suggests that the yield, in the form of methane, can be up to double the electrical energy input of the process.

  • 17.
    Lindmark, Johan
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik.
    Nilsson, Erik
    Lagerkvist, Anders
    Luleå University of Technology, Division of Waste Science and Technology.
    Andreas, Lale
    Luleå University of Technology, Division of Waste Science and Technology.
    Carlsson, My
    Luleå University of Technology, Division of Waste Science and Technology.
    Thorin, Eva
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik.
    Dahlquist, Erik
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik.
    Pretreatment of Substrate for Increased Biogas Production2010Konferensbidrag (Refereegranskat)
  • 18.
    Lönnqvist, Tomas
    et al.
    KTH, Energi och klimatstudier, ECS.
    Olsson, Jesper
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. MDH.
    Espinosa, Cecilia
    Center for Promotion of Sustainable Technology (CPTS).
    Birbuet, Juan Cristóbal
    Center for Promotion of Sustainable Technology (CPTS).
    Silveira, Semida
    KTH.
    Dahlquist, Erik
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Thorin, Eva
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Persson, Per-Erik
    VAFAB Miljö AB.
    Lindblom, Sandra
    VAFAB Miljö AB.
    Khatiwada, Dilip
    KTH.
    The potential for waste to biogas in La Paz and El Alto in Bolivia2013Ingår i: 1st International Water Association Conference on HolisticSludge Management, 2013, Västerås Sweden, 2013Konferensbidrag (Refereegranskat)
    Abstract [en]

    In the cities of La Paz and El Alto, 573 tons of organic material are disposed in landfills every day. These residues can be used to produce biogas and recycle nutrients, thus alleviating environmental impacts related to waste management. Technical solutions are evaluated through a multicriteria analysis with the purpose of defining a strategy for implementing waste-to-biogas in the two cities. As a result, the development for waste-to-biogas-system is defined in three steps. Step 1 consists of an active extraction system of landfill gas in the already existing landfills. Step 2 implies the establishment of a dry-digestion biogas facility based on present waste collection practices, that is, not segregated waste. Step 3 consists of a biogas plant using dry digestion for processing source segregated bio-waste. The economic feasibility of these three steps is evaluated. Despite prevailing fossil fuels subsidies in the country, implementing waste-to-biogas turn out feasible in the country provided the digestate is commercialized as bio-fertilizer or erosion control material and additional services such as waste collection and deposition are computed in the total economy of the biogas production plant.

  • 19.
    Mabecua, Fastudo Jorge
    et al.
    Mälardalens universitet, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Schwede, Sebastian
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Lucas, C.
    Department of Chemical Engineering, Eduardo Mondlane University, Maputo, Mozambique.
    Klintenberg, Patrik
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Agro-waste, a solution for rural electrification?: Assessing biomethane potential of agro-waste in inhambane province, southern mozambique2021Ingår i: Water, E-ISSN 2073-4441, Vol. 13, nr 7, artikel-id 939Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this study, we investigated the biomethane potential of cassava peels from the four most common varieties of cassava grown in Inhambane Province in Mozambique, Chinhembue, Cussi, Cizangara and Nhassumbi. Agro-wastes from coconut wood and jambolan wood processing were also analyzed to give a complete analysis of the most significant sources of agro-waste in the province. The macromolecular composition (carbohydrates, lipids and proteins) was determined and used to calculate the theoretical maximum biochemical methane potential (BMP). The results show that cassava fiber and cassava peel, which are considered to be waste, are viable resources for biomethane production. Further, the results show that cassava fiber and cassava peel have a higher biomethane potential compared with sawdust, and are therefore more suitable for biomethane production. A study to investigate the effect of toxic cyanogenic glycosides and lignin on cassava peels, using pre-treatment techniques to enhance biogas yield, should be carried out. An estimate of how much electricity can be generated based on the availability of agro-waste (cassava residues) and the amount of biomethane produced in our laboratory experiment was carried out. The amount of electricity that can be produced is enough to provide a valuable contribution to the production process in small and medium sized enterprises (SMEs) and in the cassava industry, or some other use in the rural setting. 

  • 20.
    Malmberg, Jennie
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    The neuroanatomical  expression profile of novel  membrane proteins.: The effect of macronutrients on gene expression.2008Självständigt arbete på avancerad nivå (magisterexamen), 20 poäng / 30 hpStudentuppsats
    Abstract [en]

    Worldwide obesity is an increasing problem. Apart from the fact that obesity greatly  impairs the health, quality and length of life for the affected individuals, it is also has the  potential to become a major socioeconomic problem in a near future. However preventive  actions require an understanding of the cause. Before the psychological influence on  eating can be evaluated a profound understanding of the biological regulatory system and  how this interacts with the food consumed is required. On the assumption that food  consumption is regulated by interplay between food and genes, the food itself may  influence the genes that regulate consumption, hence change the expression levels of the  genes regulating food intake.     To evaluate the interplay between food and gene expression, the project contained several  parts, reflecting different aspects of the area of research. The feeding studies had in  common that they were initial trials in a larger project. The results of these will be  evaluated and used in combination with further studies.     The mice typed for food preference illustrate the complexity of the feeding regulatory  system by pointing out the differences between individuals even in a relatively small  group of animals. Mice in general like food high in fat and here the animals that showed a  preference for sugar also showed a significant increase in their intake of chow. Since  chow consists mainly of carbohydrates the results might indicate a preference not for  sucrose in particular but for carbohydrates in general. The effect this may have on other  studies is still unclear as further studies are needed to determine whether the difference  may be the result of an innate genetic difference.      Leucine has been previously shown to reduce the total caloric intake. When given in  combination with palatable food the addition of Leucine primarily reduced the intake of  chow. From a dietary perspective this would translate to a preference to sweets and fast  food at the expense of food with more nutritious content.     The RT-PCR analysis’s gives clues to how the energy regulatory circuitry responds to the  intake of selected macronutrients. When it comes to gene expression there is a significant  effect of macronutrients on the gene expression levels. The common theme for many of  the genes tested seems to be down regulation of satiety signals, as if to support over  feeding on palatable diets and in many cases sucrose in particular.     The intake of macronutrients such as sugar or fat has been showed to have an effect on  the feeding regulatory circuitry, demonstrated by the change in gene expression levels.   The response to said macronutrients is site specific which is clearly shown both by RTPCR analysis of samples from different parts of the brain, such as the brainstem or  hypothalamus, and by immunohistochemistry of selected areas. The  immunohistochemistry also confirms that the novel Oxytocin receptor-antagonist, who is  injected IP, actually passes over the blood-brain barrier and has an actual affect on the  regions of interest. The areas affected by the antagonist can be visualized and identified  through the staining of active sites.

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  • 21.
    Molin, Elin
    et al.
    Dalarna Univ, Energy Technol, SE-79188 Falun, Sweden.;PPAM Solkraft AB, Corp Res, SE-59072 Ljungsbro, Sweden..
    Stridh, Bengt
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Molin, Andreas
    PPAM Solkraft AB, Corp Res, SE-59072 Ljungsbro, Sweden.;Linkoping Univ, Dept Management & Engn, Div Energy Syst, SE-58183 Linkoping, Sweden..
    Waeckelgard, Ewa
    Dalarna Univ, Energy Technol, SE-79188 Falun, Sweden..
    Experimental Yield Study of Bifacial PV Modules in Nordic Conditions2018Ingår i: IEEE Journal of Photovoltaics, ISSN 2156-3381, E-ISSN 2156-3403, Vol. 8, nr 6, s. 1457-1463Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This study reports on the first full-year field study in Sweden using bifacial photovoltaic modules. The two test sites are located on flat roofs with a low albedo of 0.05 in Linkoping (58 degrees N) and were studied fromDecember 2016 to November 2017. Site 1 has monofacial and bifacial modules with a 40 degrees tilt facing south, which is optimal for annual energy yield for monofacial modules at this location. Site 2 has monofacial 40 degrees tilt south-facing modules and bifacial vertical east-west orientated modules. The annual bifacial energy gain (BGE) was5% at site 1 and1% at site 2 for albedo 0.05. The difference in power temperature coefficients between bifacial and monofacial modules was estimated to influence BG(E) by + 0.4 and + 0.1 percentage points on site 1 and 2, respectively. A higher albedo could be investigated on a sunny day with fresh snow for the bifacial east-west modules. The specific yield was 7.57 kWh/kW(p), which was a yield increase of 48% compared with tar paper at similar solar conditions.

  • 22.
    Naqvi, Muhammad
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Department of Chemical Engineering and Technology, KTH.
    Yan, Jinyue
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling. Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Dahlquist, Erik
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling. Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Bio-refinery system in a pulp mill for methanol production with comparison of pressurized black liquor gasification and dry gasification using direct causticization2012Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 90, nr 1, s. 24-31Artikel i tidskrift (Övrigt vetenskapligt)
    Abstract [en]

    Black liquor gasification (BLG) for bio-fuel or electricity production at the modern pulp mills is a field incontinuous evolution and the efforts are considerably driven by the climate change, fuel security, andrenewable energy. This paper evaluates and compares two BLG systems for methanol production: (i) oxygenblown pressurized thermal BLG; and (ii) dry BLG with direct causticization, which have beenregarded as the most potential technology candidates for the future deployment. A key objective is toassess integration possibilities of BLG technologies with the reference Kraft pulp mill producing1000 air dried tonnes (ADt) pulp/day replacing conventional recovery cycle. The study was performedto compare the systems’ performance in terms of potential methanol production, energy efficiency,and potential CO2 reductions. The results indicate larger potential of black liquor conversion to methanolfrom the pressurized BLG system (about 77 million tonnes/year of methanol) than the dry BLG system(about 30 million tonnes/year of methanol) utilizing identical amount of black liquor available worldwide(220 million tDS/year). The potential CO2 emissions reduction from the transport sector is substantiallyhigher in pressurized BLG system (117 million tonnes/year CO2 reductions) as compared to dry BLGsystem (45 million tonnes/year CO2 reductions). However, the dry BLG system with direct causticizationshows better results when considering consequences of additional biomass import. In addition,comparison of methanol production via BLG with other bio-refinery products, e.g. hydrogen, dimethylether (DME) and bio-methane, has also been discussed.

  • 23.
    Nordlander, Eva
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    System studies of Anaerobic Co-digestion Processes2017Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    Production of biogas through anaerobic digestion is one pathway to achieving the European Union (EU) goals of reducing greenhouse gas emissions, increasing the share of renewable energy, and improving energy efficiency. In this thesis, two different models (Anaerobic Digestion Model No. 1 and an artificial neural network) are used to simulate a full-scale co-digester in order to evaluate the feasibility of such models. This thesis also includes models of two systems to study the inclusion of microalgae in biogas plants and wastewater treatment plants. One of the studies is a life-cycle assessment in which replacement of the ley crop with microalgae is evaluated. The other study concerns the inclusion of microalgae in case studies of biological treatment in three wastewater treatment plants. Finally, the co-digestion between microalgae and sewage sludge has been simulated to evaluate the effect on biogas and methane yield. The results showed that Anaerobic Digestion Model No.1 and the artificial neural network are suitable for replicating the dynamics of a full-scale co-digestion plant. For the tested period, the artificial neural network showed a better fit for biogas and methane content than the Anaerobic Digestion Model No. 1. Simulations showed that co-digestion with microalgae tended to reduce biomethane production. However, this depended on the species and biodegradability of the microalgae. The results also showed that inclusion of microalgae could decrease carbon dioxide emissions in both types of plants and decrease the energy demand of the studied wastewater treatment plants. The extent of the decrease in the wastewater treatment plants depended on surface volume. In the biogas plant, the inclusion of microalgae led to a lower net energy ratio for the methane compared to when using ley crop silage. Both studies show that microalgae cultivation is best suited for use in summer in the northern climate.

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  • 24.
    Nordlander, Eva
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Eva, Thorin
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Yan, JinYue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. KTH-Royal Institute of Technology, Stockholm, Sweden.
    Investigating the possibility of applying an ADM1 based model to a full-scale co-digestion plant2017Ingår i: Biochemical engineering journal, ISSN 1369-703X, E-ISSN 1873-295X, Vol. 120, s. 73-83Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This study investigated the possibility of using a model based on the anaerobic digestion model no. 1 (ADM1) on a full-scale 4000 m3 digester in order to understand how such theoretical models can be applied to a real industrial process. The industrial scale digester co-digests the organic fraction of municipal solid waste, grease trap sludge, and ley crop silage with varying feed rates and amounts of volatile solids. A year of process data was collected. Biogas flow, methane content/flow, and ammonia nitrogen were the variables that the model was best at predicting (index of agreement at 0.78, 0.61/0.77, and 0.68, respectively). The model was also used to investigate the effect of increasing the volatile solids (VS) concentration entering the digester. According to simulation results, increasing the influent VS concentration will increase biogas and methane outflow (from 1.5 million Nm3 methane to more than 2 million Nm3 methane), but decrease the amounts of biogas/methane per unit of volatile solids (from about 264 Nm3methane per tonne VS to below 215 Nm3 methane per tonne VS).

  • 25.
    Nordlander, Eva
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik.
    Thorin, Eva
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik.
    Yan, Jinyue
    KTH.
    Modeling of a full-scale biogas plant using a dynamic neural network2013Konferensbidrag (Refereegranskat)
  • 26.
    Olander, Frida
    Mälardalens högskola, Institutionen för biologi och kemiteknik.
    The extracellular fibrinogen-binding protein (Efb) from S. aureus binds divalently to fibrinogen and gives rise to a specific antibody response2008Självständigt arbete på avancerad nivå (magisterexamen), 20 poäng / 30 hpStudentuppsats
    Abstract [en]

    Staphylococcus aureus is an important human and animal pathogen that causes a wide range of infections. These infections can be very serious and sometimes hard to get rid of, because of the many virulence factors the bacteria produce during infections.

    This project was a research of the extracellular fibrinogen-binding protein, Efb, which is a 15.9 kDa protein that has been shown to be an important virulence factor during S. aureus infections.

    The purpose with the project was to find out if the protein has more than one binding site to fibrinogen and if people produce antibodies against Efb.

    This was performed with methods such as affinity chromatography, ELISA, coagulation test and western blot. It was shown that Efb has two binding sites to fibrinogen. One is placed on the C-terminal part of Efb and the other on the N-terminal. It was also shown that the production of antibodies against Efb rises significantly in people during an ongoing infection.

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  • 27.
    Paz, Ana
    et al.
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Wester, Lars
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Combustion of rapeseed oil for heat production2007Ingår i: IGEC III Conf, 2007Konferensbidrag (Refereegranskat)
  • 28.
    Rudovica, Vita
    et al.
    Univ Latvia, Dept Analyt Chem, Riga, Latvia..
    Rotter, Ana
    Natl Inst Biol, Marine Biol Stn Piran, Piran, Slovenia..
    Gaudencio, Susana P.
    NOVA Univ Lisbon, NOVA Sch Sci & Technol, Associate Lab I4HB Inst Hlth & Bioecon, Dept Chem,UCIBIO Appl Mol Biosci Unit, Caparica, Portugal..
    Novoveska, Lucie
    Scottish Assoc Marine Sci, Oban, Argyll, Scotland..
    Akguel, Fusun
    Burdur Mehmet Akif Ersoy Univ, Fac Sci & Arts, Dept Mol Biol & Genet, Burdur, Turkey..
    Akslen-Hoel, Linn Kristin
    Moreforsking AS, Lesund, Norway..
    Alexandrino, Diogo A. M.
    Univ Porto, Interdisciplinary Ctr Marine & Environm Res, Matosinhos, Portugal..
    Anne, Olga
    Klaipeda Univ, Dept Engn, Klaipeda, Lithuania..
    Arbidans, Lauris
    Univ Latvia, Dept Analyt Chem, Riga, Latvia..
    Atanassova, Miroslava
    Moreforsking AS, Lesund, Norway..
    Beldowska, Magdalena
    Univ Gdansk, Inst Oceanog, Gdynia, Poland..
    Beldowski, Jacek
    Polish Acad Sci, Inst Oceanol, Sopot, Poland..
    Bhatnagar, Amit
    LUT Univ, LUT Sch Engn Sci, Dept Separat Sci, Mikkeli, Finland..
    Bikovens, Oskars
    Latvian State Inst Wood Chem, Riga, Latvia..
    Bisters, Valdis
    Univ Latvia, Dept Environm Sci, Riga, Latvia..
    Carvalho, Maria F.
    Univ Porto, Interdisciplinary Ctr Marine & Environm Res, Matosinhos, Portugal.;Univ Porto, Inst Biomed Sci Abel Salazar, Porto, Portugal..
    Catala, Teresa S.
    Carl von Ossietzky Univ Oldenburg, Inst Chem & Biol Marine Environm ICBM, ICBM MPI Bridging Grp Marine Geochem, Oldenburg, Germany..
    Dubnika, Arita
    Riga Tech Univ, Fac Mat Sci & Appl Chem, Rudolfs Cimdins Riga Biomat Innovat & Dev Ctr, Inst Gen Chem Engn, Riga, Latvia.;Riga Tech Univ, Baltic Biomat Ctr Excellence, Riga, Latvia..
    Erdogan, Aysegul
    Ege Univ Applicat & Res Ctr Testing & Anal EGE MA, Izmir, Turkey..
    Ferrans, Laura
    Linnaeus Univ, Dept Biol & Environm Sci, Kalmar, Sweden..
    Haznedaroglu, Berat Z.
    Bogazici Univ, Inst Environm Sci, Istanbul, Turkey..
    Setyobudi, Roy Hendroko
    Univ Muhammadiyah Malang, Waste Lab, Malang, Indonesia..
    Graca, Bozena
    Univ Gdansk, Inst Oceanog, Gdynia, Poland..
    Grinfelde, Inga
    Latvia Univ Life Sci & Technol, Lab Forest & Water Resources, Jelgava, Latvia..
    Hogland, William
    Linnaeus Univ, Dept Biol & Environm Sci, Kalmar, Sweden..
    Ioannou, Efstathia
    Natl & Kapodistrian Univ Athens, Dept Pharm, Sect Pharmacognosy & Chem Nat Prod, Athens, Greece..
    Jani, Yahya
    Malmö universitet, Institutionen för Urbana Studier (US), Sweden.
    Katarzyte, Marija
    Klaipeda Univ, Marine Res Inst, Klaipeda, Lithuania..
    Kikionis, Stefanos
    Natl & Kapodistrian Univ Athens, Dept Pharm, Sect Pharmacognosy & Chem Nat Prod, Athens, Greece..
    Klun, Katja
    Natl Inst Biol, Marine Biol Stn Piran, Piran, Slovenia..
    Kotta, Jonne
    Univ Tartu, Estonian Marine Inst, Tallinn, Estonia..
    Kriipsalu, Mait
    Estonian Univ Life Sci, Chair Rural Bldg & Water Management, Tartu, Estonia..
    Labidi, Jalel
    Univ Basque Country, Dept Chem & Environm Engn, Donostia San Sebastian, Spain..
    Bilela, Lada Lukic
    Univ Sarajevo, Fac Sci, Dept Biol, Sarajevo, Bosnia & Herceg..
    Martinez-Sanz, Marta
    CEI UAM CSIC, CIAL CSIC UAM, Inst Food Sci Res, Madrid, Spain..
    Oliveira, Juliana
    NOVA Univ Lisbon, NOVA Sch Sci & Technol, Associate Lab I4HB Inst Hlth & Bioecon, Dept Chem,UCIBIO Appl Mol Biosci Unit, Caparica, Portugal..
    Ozola-Davidane, Ruta
    Univ Latvia, Dept Environm Sci, Riga, Latvia..
    Pilecka-Ulcugaceva, Jovita
    Latvia Univ Life Sci & Technol, Lab Forest & Water Resources, Jelgava, Latvia..
    Pospiskova, Kristyna
    CAS, Dept Nanobiotechnol, Biol Ctr, ISB, Ceske Budejovice, Czech Republic.;Palacky Univ, Reg Ctr Adv Technol & Mat, Czech Adv Technol & Res Inst, Olomouc, Czech Republic..
    Rebours, Celine
    Moreforsking AS, Lesund, Norway..
    Roussis, Vassilios
    Natl & Kapodistrian Univ Athens, Dept Pharm, Sect Pharmacognosy & Chem Nat Prod, Athens, Greece..
    Lopez-Rubio, Amparo
    IATA CSIC, Inst Agrochem & Food Technol, Valencia, Spain..
    Safarik, Ivo
    CAS, Dept Nanobiotechnol, Biol Ctr, ISB, Ceske Budejovice, Czech Republic.;Palacky Univ, Reg Ctr Adv Technol & Mat, Czech Adv Technol & Res Inst, Olomouc, Czech Republic..
    Schmieder, Frank
    Linnaeus Univ, Dept Biol & Environm Sci, Kalmar, Sweden..
    Stankevica, Karina
    Univ Latvia, Dept Environm Sci, Riga, Latvia..
    Tamm, Toomas
    Estonian Univ Life Sci, Chair Rural Bldg & Water Management, Tartu, Estonia..
    Tasdemir, Deniz
    GEOMAR Ctr Marine Biotechnol, GEOMAR Helmholtz Ctr Ocean Res, Res Unit Marine Nat Prod Chem, Kiel, Germany.;Univ Kiel, Fac Math & Nat Sci, Kiel, Germany..
    Torres, Cristiana
    NOVA Univ Lisbon, NOVA Sch Sci & Technol, Associate Lab I4HB Inst Hlth & Bioecon, Dept Chem,UCIBIO Appl Mol Biosci Unit, Caparica, Portugal..
    Varese, Giovanna Cristina
    Univ Torino, Mycotheca Univ Taurinensis, Dept Life Sci & Syst Biol, Turin, Italy..
    Vincevica-Gaile, Zane
    Univ Latvia, Dept Environm Sci, Riga, Latvia..
    Zekker, Ivar
    Univ Tartu, Inst Chem, Tartu, Estonia..
    Burlakovs, Juris
    Univ Latvia, Dept Environm Sci, Riga, Latvia..
    Valorization of Marine Waste: Use of Industrial By-Products and Beach Wrack Towards the Production of High Added-Value Products2021Ingår i: Frontiers in Marine Science, E-ISSN 2296-7745, Vol. 8, artikel-id 723333Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    Biomass is defined as organic matter from living organisms represented in all kingdoms. It is recognized to be an excellent source of proteins, polysaccharides and lipids and, as such, embodies a tailored feedstock for new products and processes to apply in green industries. The industrial processes focused on the valorization of terrestrial biomass are well established, but marine sources still represent an untapped resource. Oceans and seas occupy over 70% of the Earth's surface and are used intensively in worldwide economies through the fishery industry, as logistical routes, for mining ores and exploitation of fossil fuels, among others. All these activities produce waste. The other source of unused biomass derives from the beach wrack or washed-ashore organic material, especially in highly eutrophicated marine ecosystems. The development of high-added-value products from these side streams has been given priority in recent years due to the detection of a broad range of biopolymers, multiple nutrients and functional compounds that could find applications for human consumption or use in livestock/pet food, pharmaceutical and other industries. This review comprises a broad thematic approach in marine waste valorization, addressing the main achievements in marine biotechnology for advancing the circular economy, ranging from bioremediation applications for pollution treatment to energy and valorization for biomedical applications. It also includes a broad overview of the valorization of side streams in three selected case study areas: Norway, Scotland, and the Baltic Sea.</p>

  • 29.
    Salman, Chaudhary Awais
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Schwede, Sebastian
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Thorin, Eva
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Enhancing biomethane production by integrating pyrolysis and anaerobic digestion processes2017Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 204, s. 1074-1083Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The anaerobic digestion of source-separated organic waste is a mature and increasingly used process for biomethane production. However, the efficient use of different fractions of waste is a big concern in anaerobic digestion plants. This study proposes the use of a new process configuration that couples the anaerobic digestion of biodegradable waste with the pyrolysis of lignocellulosic or green waste. The biochar obtained from pyrolysis was added to a digester as an adsorbent to increase the biomethane content and to support the development of a stable microbial community. In addition, the bio-oil and syngas produced by the pyrolysis process were reformed into syngas and then converted to biomethane via methanation. Modelling and simulations were performed for the proposed novel process. The results showed an approximately 1.2-fold increase in the biomethane volume produced. An overall efficiency of 67% was achieved, whereas the stand-alone anaerobic digestion system had an efficiency of only 52%. The results also indicated a high annual revenue for the integrated process compared to that for an alternative treatment (incineration) of green waste.

  • 30.
    Schwede, Sebastian
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Thorin, Eva
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Lindmark, Johan
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Klintenberg, Patrik
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Jääskelainen, A
    Savonia Univ Appl Sci, Environm Engn, Kuopio, Finland.
    Suhonen, A.
    Savonia Univ Appl Sci, Environm Engn, Kuopio, Finland.
    Laatikainen, R.
    Univ Eastern Finland, Sch Pharm, Kuopio, Finland.
    Hakalehto, E.
    Univ Eastern Finland, Sch Pharm, Kuopio, Finland.
    Using slaughterhouse waste in a biochemical-based biorefinery – results from pilot scale tests2017Ingår i: Environmental technology, ISSN 0959-3330, E-ISSN 1479-487X, s. 1275-1284Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A novel biorefinery concept was piloted using protein-rich slaughterhouse waste, chicken manureand straw as feedstocks. The basic idea was to provide a proof of concept for the production ofplatform chemicals and biofuels from organic waste materials at non-septic conditions. Thedesired biochemical routes were 2,3-butanediol and acetone–butanol fermentation. The resultsshowed that hydrolysis resulted only in low amounts of easily degradable carbohydrates.However, amino acids released from the protein-rich slaughterhouse waste were utilized andfermented by the bacteria in the process. Product formation was directed towards acidogeniccompounds rather than solventogenic products due to increasing pH-value affected by ammoniarelease during amino acid fermentation. Hence, the process was not effective for 2,3-butanediolproduction, whereas butyrate, propionate,γ-aminobutyrate and valerate were predominantlyproduced. This offered fast means for converting tedious protein-rich waste mixtures intoutilizable chemical goods. Furthermore, the residual liquid from the bioreactor showedsignificantly higher biogas production potential than the corresponding substrates. Thecombination of the biorefinery approach to produce chemicals and biofuels with anaerobicdigestion of the residues to recover energy in form of methane and nutrients that can beutilized for animal feed production could be a feasible concept for organic waste utilization.

  • 31.
    Skvaril, Jan
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Kyprianidis, Konstantinos
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Dahlquist, Erik
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Applications of near-infrared spectroscopy (NIRS) in biomass energy conversion processes: A review2017Ingår i: Applied spectroscopy reviews (Softcover ed.), ISSN 0570-4928, E-ISSN 1520-569X, Vol. 52, nr 8, s. 675-728Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    Biomass used in energy conversion processes is typically characterized by high variability, making its utilization challenging. Therefore, there is a need for a fast and non-destructive method to determine feedstock/product properties and directly monitor process reactors. The near-infrared spectroscopy (NIRS) technique together with advanced data analysis methods offers a possible solution. This review focuses on the introduction of the NIRS method and its recent applications to physical, thermochemical, biochemical and physiochemical biomass conversion processes represented mainly by pelleting, combustion, gasification, pyrolysis, as well as biogas, bioethanol, and biodiesel production. NIRS has been proven to be a reliable and inexpensive method with a great potential for use in process optimization, advanced control, or product quality assurance.

  • 32.
    Svensson, L M
    et al.
    Lund University, Sweden.
    Christensson, K
    Mälardalens högskola, Akademin för hälsa, vård och välfärd. Lund University, Sweden.
    Björnsson, L
    Lund University, Sweden.
    Biogas production from crop residues on a farm-scale level in Sweden: scale, choice of substrate and utilisation rate most important parameters for financial feasibility.2006Ingår i: Bioprocess and biosystems engineering (Print), ISSN 1615-7591, E-ISSN 1615-7605, Vol. 29, nr 2, s. 137-142Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Anaerobic digestion would enable the energy potential of agricultural crop residues such as ley crops and sugar beet tops to be harnessed in Sweden. In the present study, the financial prospects of single-stage fed-batch high-solids digestion on three different scales, 51, 67, and 201 kW, were calculated on the basis of experimental results and observations. In addition to scale, the effects of methane yield and fertiliser recovery (compared to green manuring) was investigated by testing different substrate mixtures. The biogas was disposed as heat, combined heat and power, or as vehicle fuel. Besides the positive effect of scale, the results indicate the importance of choosing substrates with a high methane yield and high nitrogen content, and the necessity of fully utilising both the capacity of the equipment installed and the energy carriers produced. Net unit costs of 5.3 and 8.1 ct/kWh were achieved (201 kW), heat and vehicle fuel, respectively.

  • 33.
    Thorin, Eva
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Lindmark, Johan
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Schwede, Sebastian
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Freidank, Tim
    Ostfalia University of Applied Sciences.
    Drescher-Hartung, Silvia
    Ostfalia University of Applied Sciences.
    Daukšys, Vygintas
    Klaipeda University.
    Ahrens, Thorsten
    Ostfalia University of Applied Sciences.
    POSSIBILITES FOR OPTIMIZATION OF THE DRY DIGESTION PROCESS2014Rapport (Övrigt vetenskapligt)
    Ladda ner fulltext (pdf)
    fulltext
  • 34.
    Thorin, Eva
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Nordlander, Eva
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Lindmark, Johan
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Schwede, Sebastian
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Jansson, Joakim
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Hakalehto, Elias
    Finnoflag.
    Heitto, Anneli
    Finnoflag.
    Jääskeläinen, Ari
    Savonia University of Applied Sciences.
    Suhonen,, Anssi
    Savonia University of Applied Sciences.
    Den Boer, Emilia
    Wrocław University of Technology.
    Possibilites for Optimization of Biorefinery process2014Rapport (Övrigt vetenskapligt)
  • 35.
    Waara, Sylvia
    et al.
    Mälardalens högskola, Institutionen för samhällsteknik. Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Waara, Karl-Otto
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Forsberg, Åke
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Fridolfsson, Magnus
    Performance of a constructed wetland system for treatment of landfill leachate.2008Ingår i: Waste 2008. Waste and Resource management-A shared responsibility, 2008, s. 655-667Konferensbidrag (Refereegranskat)
    Abstract [en]

    The performance of a constructed wetland for treatment of landfill leachate has been evaluated based upon data obtained during 4 years (2003-2006). It consists of a series of 10 ponds with a total capacity of 52.000 m3 covering 8 ha. Using univariate and multivariate statistics (PCA) the reduction pattern of a large number of chemical parameters including heavy metals has been investigated in 3 parts of the wetland with equal volume. Analyses show that many parameters are removed to the greatest extent in the first part of the system (e.g. many heavy metals, total suspended solids) or the second part of the system (N-NH4) while other parameters such as total nitrogen are more gradually reduced (10 ton/year removed).  Toxicity testing with 5 bioassays showed that toxicity was sometimes observed at the inlet but no toxicity was observed at the outlet for 4 of the test species. The data presented will be used for optimizing the treatment process as well as to improve the monitoring program.

  • 36.
    Wang, C. S.
    et al.
    Tianjin Univ, Key Lab Smart Grid, Minist Educ, Tianjin 30072, Peoples R China..
    Yan, Jinyue
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. Royal Inst Technol, Sch Chem Sci & Engn, S-10044 Stockholm, Sweden..
    Jia, H. J.
    Tianjin Univ, Key Lab Smart Grid, Minist Educ, Tianjin 30072, Peoples R China..
    Wu, J. Z.
    Cardiff Univ, Sch Engn, Cardiff CF24 3AA, S Glam, Wales..
    Yu, J. C.
    State Grid Tianjin Elect Power Co, Tianjin 300010, Peoples R China..
    Xu, T.
    Tianjin Univ, Key Lab Smart Grid, Minist Educ, Tianjin 30072, Peoples R China..
    Zhang, Y.
    Malardalen Univ, Sch Sustainable Dev Soc & Technol, S-72123 Vasteras, Sweden..
    Renewable and distributed energy integration with mini/microgrids2019Ingår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 237, s. 920-923Artikel i tidskrift (Övrigt vetenskapligt)
  • 37.
    Zafar, Muhammad Abdullah
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Optimization of Combined heat and power plant (CHP) integrated with transportation fuel2018Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Regional energy system consists of the three sections heat, electricity and transport. The alternatives of fossil fuels are getting importance in research fields to reduce its adverse effect on the environment, especially in the transport sector. The bioethanol is focusing on recent years to reduce the greenhouse gas (GHG) emission and energy dependence on other countries.

    This study focus on analyzing the energy system including the heat and power plant integrating with transportation fuel production with the best utilization of the locally available energy resources. The four regions of vastmanland Vasteras, Koping, Norberg, Skinskatterberg are considered for the energy resources due to its large arable land. The data regarding local energy resources (household waste, peat and wood chips, coal) used in CHP plant are taken from the different bureau and some are assumed as seen in the previous year's trends. The four crops ( winter wheat, spring wheat, spring barley, and oats) are focused for biofuel production in the integrated plant. It is very difficult to predict the crops production and its hectares areas because it is dependent upon the weather conditions. The passenger cars only considered for calculating the biofuel demand in considered regions because data is easily available.

    The dynamic model is developed for the optimization of the ethanol plant integrated with CHP plant to reduce the system cost and reduction of the greenhouse gas (GHG) emission.  The mixed integer programming is the best way for system optimization and it developed with the help of the GAMS, which is best suited for complex problems.

     The four case studies are analyzed in which different parameters are changed from 2017 to 2030 years. In the first scenario, all parameters are changed next fourteen years with previous trends. The vehicle's number run on gasoline, straw production hectares area and its production are changed in second, third and fourth scenarios respectively.

     The CHP produce the heat and electricity with local fuels and import fuels which have the cheapest production prices. The fuel E05 and tall oil pitch are also considered to use in the system but due to its heavy prices is not used. The region heat and electricity demand satisfied by importing to the region as compared to produce with some sources are very high prices.  The huge amount of ethanol is produced in each scenario because demand is very little in regions, large amount exported all scenario.  The ethanol import in the last three years of the second scenario because the production of ethanol is less and demand is high. The ethanol demand and production is equal from 3rd year to 5th year in the fourth scenario. The exported ethanol l to another region can provide the fuel to more than 500,000 passenger cars in each scenario.

    The ethanol utilization in the region can reduce the CO2 emission effectively. The first scenario emitted 120-140Kt CO2 during fourteen years while it reduced to 89 Kt and 77 Kt in the third and fourth scenario. It reduced 36% and 45% CO2 if  10%/year and 50%/years vehicles run by gasoline cars shifted to E85.

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