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  • 1.
    Han, Song
    et al.
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Dotzauer, Erik
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Thorin, Eva
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Jan, Yinyue
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Annual performance analysis and comparison of pellet production integrated with an existing combined heat and power plant2011Inngår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 102, nr 10, s. 6317-6325Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Three optional pellet production processes integrated with an existing biomass-based CHP plant using different raw materials (wood chips and solid hydrolysis residues) are studied. The year is divided into 12 periods, and the integrated biorefinery systems are modeled and simulated for each period. The annual economic performance of three integrated biorefinery systems is analyzed based on the simulation results. The option of pellet production integrated with the existing CHP plant with the exhaust flue gas and superheated steam as drying mediums has the lowest specific pellet production cost of 105 €/tpellet, the shortest payback time of less than 2 years and the greatest CO2 reduction of the three options. An advantage in common among the three options is a dramatic increase of the total annual power production and significant CO2 reduction in spite of a small decrease of power efficiency.

  • 2. Jianguo, Li
    et al.
    Shaokai, Zhang
    Li, Hailong
    Mälardalens högskola, Akademin för innovation, design och teknik. Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Xinhua, Ouyang
    Liulian, Huang
    Yonghao, Ni
    Lihui, Chen
    Cellulase pretreatment for enhancing cold caustic extraction-based separation of hemicelluloses and cellulose from cellulosic fibers2018Inngår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 251, s. 1-6Artikkel i tidsskrift (Fagfellevurdert)
  • 3.
    Krustok, Ivo
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Odlare, Monica
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Truu, Jaak
    University of Tartu, Estonia.
    Nehrenheim, Emma
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Inhibition of nitrification in municipal wastewater treating photobioreactors: effect on algal growth and nutrient uptake2016Inngår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 202, s. 238-243Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The effect of inhibiting nitrification on algal growth and nutrient uptake was studied in photobioreactors treating municipal wastewater. As previous studies have indicated that algae prefer certain nitrogen species to others, and because nitrifying bacteria are inhibited by microalgae, it is important to shed more light on these interactions. In this study allylthiourea (ATU) was used to inhibit nitrification in wastewater-treating photobioreactors. The nitrification-inhibited reactors were compared to control reactors with no ATU added.

    Microalgae had higher growth in the inhibited reactors, resulting in a higher chlorophyll a concentration. The species mix also differed, with Chlorella and Scenedesmus being the dominant genera in the control reactors and Cryptomonas and Chlorella dominating in the inhibited reactors. The nitrogen speciation in the reactors after 8 days incubation was also different in the two setups, with N existing mostly as NH4-N in the inhibited reactors and as NO3-N in the control reactors.

  • 4.
    Li, Y.
    et al.
    Tsinghua University, Beijing, China.
    Jin, Y.
    Tsinghua University, Beijing, China.
    Borrion, A.
    University College London, London, United Kingdom.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Li, J.
    Tsinghua University, Beijing, China.
    Effects of organic composition on mesophilic anaerobic digestion of food waste2017Inngår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 244, s. 213-224Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Anaerobic digestion of food waste (FW) has been widely investigated, however, little is known about the influence of organic composition on the FW digestion process. This study aims to identify the optimum composition ratios of carbohydrate (CA), protein (CP) and lipid (EE) for maintaining high methane yield and process stability. The results show that the CA–CP–EE ratio was significantly correlated with performance and degradability parameters. Controlling the CA–CP–EE ratio higher than 1.89 (CA higher than 8.3%, CP lower than 5.0%, and EE lower than 5.6%) could be an effective way to maintain stable digestion and achieve higher methane production (385–627 mL/g VS) and shorter digestion retention (196–409 h). The CA-CP-EE ratio could be used as an important indicator for digestion performance. To effectively evaluate organic reduction, the concentration and removal efficiency of organic compositions in both solid phases and total FW should be considered. 

  • 5.
    Li, Y.
    et al.
    Tsinghua University, Beijing, China.
    Jin, Y.
    Tsinghua University, Beijing, China.
    Borrion, A.
    University College London, London, United Kingdom.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Li, J.
    Tsinghua University, Beijing, China.
    Effects of organic composition on the anaerobic biodegradability of food waste2017Inngår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 243, s. 836-845Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This work investigated the influence of carbohydrates, proteins and lipids on the anaerobic digestion of food waste (FW) and the relationship between the parameters characterising digestion. Increasing the concentrations of proteins and lipids, and decreasing carbohydrate content in FW, led to high buffering capacity, reduction of proteins (52.7–65.0%) and lipids (57.4–88.2%), and methane production (385–627 mLCH4/g volatile solid), while achieving a short retention time. There were no significant correlations between the reduction of organics, hydrolysis rate constant (0.25–0.66 d−1) and composition of organics. Principal Component Analysis revealed that lipid, C, and N contents as well as the C/N ratio were the principal components for digestion. In addition, methane yield, the final concentrations of total ammonia nitrogen and free ammonia nitrogen, final pH values, and the reduction of proteins and lipids could be predicted by a second-order polynomial model, in terms of the protein and lipid weight fraction. 

  • 6.
    Li, Yangyang
    et al.
    Tsinghua University.
    Jin, Yiying
    Tsinghua University.
    Borrion, Aiduan
    University College London.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Current status of food waste generation and management in China2019Inngår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 273, s. 654-665Artikkel i tidsskrift (Fagfellevurdert)
  • 7.
    Lu, H.
    et al.
    East China University of Science and Technology, Shanghai, China.
    Yu, X.
    East China University of Science and Technology, Shanghai, China.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Tu, S. -T
    East China University of Science and Technology, Shanghai, China.
    Schwede, Sebastian
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Lipids extraction from wet Chlorella pyrenoidosa sludge using recycled [BMIM]Cl2019Inngår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 291, artikkel-id 121819Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this study, experiments on pretreating one species of microalgae (Chlorella pyrenoidosa) using one kind of ionic liquid (IL) of [BMIM]Cl were conducted. The aim of this work is to evaluate the recycling efficacy of expensive IL solvent for effective cell disruption. It was indicated that the molecular structure of IL was stable during the recycling test. Five times antisolvent precipitation of microalgae debris after lipid extraction using methanol recovered 99.8% IL with the energy consumption of 4.46 MJ per kg dry Chlorella pyrenoidosa. The chromatography was used to separate IL and hydrolysates, resulting in the IL loss below 1.97 g per kg dry Chlorella pyrenoidosa. © 2019 Elsevier Ltd

  • 8. M, Naqvi
    et al.
    Yan, Jinyue
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Dahlquist, Erik
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Black liquor gasification integrated in pulp and paper mills: A critical review2010Inngår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 101, nr 21, s. 8001-8015Artikkel i tidsskrift (Annet vitenskapelig)
  • 9.
    Naqvi, M.
    et al.
    KTH.
    Yan, Jinyue
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Dahlquist, Erik
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Energy conversion performance of black liquor gasification to hydrogen production using direct causticization with CO2 capture2012Inngår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 110, s. 637-644Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper estimates potential hydrogen production via dry black liquor gasification system with direct causticization integrated with a reference pulp mill. The advantage of using direct causticization is elimination of energy intensive lime kiln. Pressure swing adsorption is integrated in the carbon capture process for hydrogen upgrading. The energy conversion performance of the integrated system is compared with other bio-fuel alternatives and evaluated based on system performance indicators. The results indicated a significant hydrogen production potential (about 141 MW) with an energy ratio of about 0.74 from the reference black liquor capacity (about 243.5 MW) and extra biomass import (about 50 MW) to compensate total energy deficit. About 867,000 tonnes of CO2 abatement per year is estimated i.e. combining CO2 capture and CO2 offset from hydrogen replacing motor gasoline. The hydrogen production offers a substantial motor fuel replacement especially in regions with large pulp and paper industry e.g. about 63% of domestic gasoline replacement in Sweden. (C) 2012 Elsevier Ltd. All rights reserved.

  • 10.
    Naqvi, Muhammad
    et al.
    Department of Chemical Engineering/Energy Processes, Royal Institute of Technology.
    Yan, Jinyue
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Fröling, M.
    Department of Chemical and Biological Engineering, Chalmers University of Technology.
    Bio-refinery system of DME or CH4 production from black liquor gasification in pulp mills2010Inngår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 101, nr 3, s. 937-944Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    There is great interest in developing black liquor gasification technology over recent years for efficient recovery of bio-based residues in chemical pulp mills. Two potential technologies of producing dimethyl ether (DME) and methane (CH4) as alternative fuels from black liquor gasification integrated with the pulp mill have been studied and compared in this paper. System performance is evaluated based on: (i) comparison with the reference pulp mill, (ii) fuel to product efficiency (FTPE) and (iii) biofuel production potential (BPP). The comparison with the reference mill shows that black liquor to biofuel route will add a highly significant new revenue stream to the pulp industry. The results indicate a large potential of DME and CH4 production globally in terms of black liquor availability. BPP and FTPE of CH4 production is higher than DME due to more optimized integration with the pulping process and elimination of evaporation unit in the pulp mill.

  • 11.
    Nehrenheim, Emma
    et al.
    Mälardalens högskola, Institutionen för samhällsteknik. Mälardalens högskola, Akademin för ekonomi, samhälle och teknik.
    Gustafsson, Jon-Petter
    KTH.
    Kinetic sorption modelling of Cu, Ni, Zn, Pb and Cr ions to pine bark and blast furnace slag by using batch experiments2008Inngår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 99, nr 6, s. 1571-1577Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Storm water and landfill leachate can both contain significant amounts of toxic metals such as Zn, Cu, Pb, Cr and Ni. Pine bark and blast furnace slag are both residual waste products that have shown a large potential for metal removal from contaminated water. There are however many variables that must be optimized in order to achieve efficient metal retention. One of these variables is the time of which the solution is in contact with each unit of filter material. Metal sorption was studied in two laboratory experiments to improve the knowledge of the effects of contact time. The results showed that pine bark was generally more efficient than blast furnace slag when the metal concentrations were relatively small, whereas blast furnace slag sorbed most metals to a larger extent at increased metal loads. In addition, sorption to blast furnace slag was found to be faster than metal binding to pine bark. A pseudo-second-order kinetic model was able to describe the data well within 1000 s of reaction time. 

  • 12.
    Nehrenheim, Emma
    et al.
    Mälardalens högskola, Institutionen för samhällsteknik.
    Waara, Sylvia
    Johansson Westholm, Lena
    Mälardalens högskola, Institutionen för samhällsteknik.
    Metal retention on pine bark and blast furnace slag - on-site experiment for treatment of low strenght landfill leachate2008Inngår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 99, nr 5, s. 998-1005Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Treatment of landfill leachate using blast furnace slag and pine bark as reactive sorbents was studied in an in situ column experiment at the Lilla Nyby landfill site in Eskilstuna, Sweden. The columns were filled with approximately 10 1 of each sorbent and leachate was supplied at three different flow rates during a period of 4 months. Samples of inflow and outflow were collected three times a week and were analyzed for physical and chemical parameters, including concentrations of some metals, and toxicity. It was found that pine bark removed metals more efficiently than did the blast furnace slags; that Zn was most efficiently retained in the filters and that both retention time and initial concentration played an important role in the sorption process. It was also observed that the pine bark column did not release COD. No toxicity of the untreated or the treated leachate was found with the test organisms and test responses used.  

  • 13.
    Nizami, A. S.
    et al.
    King Abdulaziz Univ, CEES, Jeddah, Saudi Arabia.
    Rehan, M.
    King Abdulaziz Univ, CEES, Jeddah, Saudi Arabia.
    Waqas, M.
    King Abdulaziz Univ, CEES, Jeddah, Saudi Arabia.
    Naqvi, Muhammad
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Ouda, O. K. M.
    Prince Mohamed Bin Fahd Univ, Al Khobar, Saudi Arabia.
    Shahzad, K.
    King Abdulaziz Univ, CEES, Jeddah, Saudi Arabia.
    Miandad, R.
    King Abdulaziz Univ, CEES, Jeddah, Saudi Arabia.
    Khan, M. Z.
    Aligarh Muslim Univ, Uttar Pradesh, India.
    Syamsiro, M.
    Janabadra Univ, Indonesia.
    Ismail, I. M. I.
    King Abdulaziz Univ, CEES, Jeddah, Saudi Arabia.
    Pant, Deepak
    Flemish Inst Technol Res VITO, Mol, Belgium.
    Waste biorefineries: Enabling circular economies in developing countries2017Inngår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 241, s. 1101-1117Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper aims to examine the potential of waste biorefineries in developing countries as a solution to current waste disposal problems and as facilities to produce fuels, power, heat, and value-added products. The waste in developing countries represents a significant source of biomass, recycled materials, chemicals, energy, and revenue if wisely managed and used as a potential feedstock in various biorefinery technologies such as fermentation, anaerobic digestion (AD), pyrolysis, incineration, and gasification. However, the selection or integration of biorefinery technologies in any developing country should be based on its waste characterization. Waste biorefineries if developed in developing countries could provide energy generation, land savings, new businesses and consequent job creation, savings of landfills costs, GHG emissions reduction, and savings of natural resources of land, soil, and groundwater. The challenges in route to successful implementation of biorefinery concept in the developing countries are also presented using life cycle assessment (LCA) studies.

  • 14.
    Olsson, Jesper
    et al.
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Feng, Xin Mei
    JTI, Swedish Inst Agr & Environm Engn, SE-75007 Uppsala, Sweden .
    Ascue, Johnny
    JTI, Swedish Inst Agr & Environm Engn, SE-75007 Uppsala, Sweden .
    Gentili, Francesco G.
    Swedish Univ Agr Sci, Dept Wildlife Fish & Environm Studies, SE-90183 Umea, Sweden .
    Shabiimam, M. A.
    Indian Inst Technol, Ctr Environm Sci & Engn, Bombay 400076, Maharashtra, India.
    Nehrenheim, Emma
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Thorin, Eva
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Co-digestion of cultivated microalgae and sewage sludge from municipal waste water treatment2014Inngår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 171, s. 203-210Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this study two wet microalgae cultures and one dried microalgae culture were co-digested in different proportions with sewage sludge in mesophilic and thermophilic conditions. The aim was to evaluate if the co-digestion could lead to an increased efficiency of methane production compared to digestion of sewage sludge alone. The results showed that co-digestion with both wet and dried microalgae, in certain proportions, increased the biochemical methane potential (BMP) compared with digestion of sewage sludge alone in mesophilic conditions. The BMP was significantly higher than the calculated BMP in many of the mixtures. This synergetic effect was statistically significant in a mixture containing 63% (w/w VS based) undigested sewage sludge and 37% (w/w VS based) wet algae slurry, which produced 23% more methane than observed with undigested sewage sludge alone. The trend was that thermophilic co-digestion of microalgae and undigested sewage sludge did not give the same synergy.

  • 15.
    Starfelt, Fredrik
    et al.
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Thorin, Eva
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Dotzauer, Erik
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Yan, Jinyue
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Performance evaluation of adding ethanol production into an existing combined heat and power plant2010Inngår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 101, nr 2, s. 613-618Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this paper, the configuration and performance of a polygeneration system are studied by modelling the integration of a lignocellulosic wood-to-ethanol process with an existing combined heat and power (CHP) plant. Data from actual plants are applied to validate the simulation models. The integrated polygeneration system reaches a total efficiency of 50%, meeting the heating load in the district heating system. Excess heat from the ethanol production plant supplies 7.9MWto the district heating system, accounting for 17.5% of the heat supply at full heating load. The simulation results show that the production of ethanol from woody biomass is more efficient when integrated with a CHP plant compared to a stand-alone production plant. The total biomass consumption is reduced by 13.9% while producing the same amounts of heat, electricity and ethanol fuel as in the stand-alone configurations. The results showed that another feature of the integrated polygeneration system is the longer annual operating period compared to existing cogeneration. Thus, the renewable electricity production is increased by 2.7% per year.

  • 16.
    Wen, Zhenzhong
    et al.
    School of Mechanical and Power Engineering, East China University of Science and Technology.
    Yu, Xinhai
    School of Mechanical and Power Engineering, East China University of Science and Technology.
    Tu, Shan-Tung
    School of Mechanical and Power Engineering, East China University of Science and Technology.
    Yan, Jinyue
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Dahlquist, Erik
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Intensification of biodiesel synthesis using zigzag micro-channel reactors2009Inngår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 100, nr 12, s. 3054-3060Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Zigzag micro-channel reactors have been fabricated and used for continuous alkali-catalyzed biodiesel synthesis. The influences of the main geometric parameters on the performance of the micro-channel reactors were experimentally studied. It has been found that the zigzag micro-channel reactor with smaller channel size and more turns produces smaller droplets which result in higher efficiency of biodiesel synthesis. Compared to conventional stirred reactors, the time for high methyl ester conversion can be shortened significantly with the methyl ester yield of 99.5% at the residence time of only 28 s by using the optimized zigzag micro-channel reactor, which also exhibits less energy consumption for the same amount of biodiesel during biodiesel synthesis. The results indicate that zigzag micro-channel reactors can be designed as compact and mini-fuel processing plant for distributive applications.

  • 17. Z, Wen
    et al.
    X, Yu
    S.T, Tu
    Yan, Jinyue
    Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling.
    Biodiesel production from waste cooking oil catalyzed by TiO2-MgO mixed oxides2010Inngår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 101, nr 24, s. 9570-9576Artikkel i tidsskrift (Annet vitenskapelig)
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