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Westholm, Lena JohanssonORCID iD iconorcid.org/0000-0003-0231-564X
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Publications (10 of 39) Show all publications
Sylwan, I., Runtti, H., Thorin, E., Zambrano, J. & Westholm, L. J. (2018). BIOCHAR ADSORPTION FOR SEPARATION OF HEAVY METALSIN MUNICIPAL WASTEWATER TREATMENT. In: : . Paper presented at SMICE2018, Sludge management in a circular economy, Rome, May 23-25, 2018.
Open this publication in new window or tab >>BIOCHAR ADSORPTION FOR SEPARATION OF HEAVY METALSIN MUNICIPAL WASTEWATER TREATMENT
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2018 (English)Conference paper, Poster (with or without abstract) (Other academic)
Keywords
biochar, adsorption, municipal wastewater, sludge, heavy metals, Ni, Pb, adsorption isotherm, Langmuir, Freundlich, Redlich-Peterson
National Category
Water Engineering
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-39348 (URN)
Conference
SMICE2018, Sludge management in a circular economy, Rome, May 23-25, 2018
Projects
SMET - Separation of heavy metals in municipal wastewater treatment
Available from: 2018-05-30 Created: 2018-05-30 Last updated: 2018-05-31Bibliographically approved
Khokhotva, O. P. & Westholm, L. J. (2017). The impact of surface properties of modified pine bark on the mechanism of sorption of heavy metals from aqueous media. Journal of Water Chemistry and Technology, 39(3), 148-154
Open this publication in new window or tab >>The impact of surface properties of modified pine bark on the mechanism of sorption of heavy metals from aqueous media
2017 (English)In: Journal of Water Chemistry and Technology, ISSN 1063-455X, Vol. 39, no 3, p. 148-154Article in journal (Refereed) Published
Abstract [en]

The surface properties of pine bark before and after the treatment with urea solution and the adsorption of Cu(II), Ni(II) and Zn(II) from aqueous solutions at different pH values have been studied. Types of active sorption sites, their surface concentration and change after the bark treatment with urea solution were determined. The results of potentiometric titration were processed by using ProtoFit and FITEQL software programs. The data obtained make it possible to conclude that in the extraction mechanism of heavy metals from water the share of ion exchange decreases and the share of complexation increases. The impact of alkaline and alkaline earth metals in the range of their concentrations up to 3000 mg/dm3 on Cu(II) extraction from model aqueous solutions was also investigated. 

Place, publisher, year, edition, pages
Allerton Press Incorporation, 2017
National Category
Environmental Sciences
Identifiers
urn:nbn:se:mdh:diva-36146 (URN)10.3103/S1063455X17030055 (DOI)000405488600005 ()2-s2.0-85024112076 (Scopus ID)
Available from: 2017-07-27 Created: 2017-07-27 Last updated: 2017-08-10Bibliographically approved
Repo, E., Warchoł, J. K., Johansson Westholm, L. & Sillanpää, M. (2015). Steel slag as a low-cost sorbent for metal removal in the presence of chelating agents. Journal of Industrial and Engineering Chemistry, 27, 115-125
Open this publication in new window or tab >>Steel slag as a low-cost sorbent for metal removal in the presence of chelating agents
2015 (English)In: Journal of Industrial and Engineering Chemistry, ISSN 1226-086X, E-ISSN 1876-794X, Vol. 27, p. 115-125Article in journal (Refereed) Published
Abstract [en]

Industrial byproduct, steel slag was used as a low-cost sorbent for the removal of Co(II), Ni(II), Cd(II), and Pb(II) from aqueous solutions containing chelating agents; EDTA, citrate, and oxalate. Equilibrium and kinetic studies were conducted. Clear dependency between speciation of metals and their sorption behavior was observed. Precipitation and adsorption were suggested as main mechanisms. Diffusion played an important role in the kinetics of metal removal. Notable leaching of elements was observed when steel slag was in contact with the solutions under study. Modification with chitosan was successfully used to prevent leaching and improve the sorption capacity of steel slag.

Keywords
Adsorption, Byproduct slag, EDTA, Low-cost sorbent, Metal chelates, Water treatment, Chelation, Costs, Leaching, Lead, Metals, Slags, Sorption, Chelating agent, Industrial by-products, Kinetic study, Low cost sorbents, Metal chelate, Sorption behaviors, Sorption capacities, Chemicals removal (water treatment)
National Category
Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-27678 (URN)10.1016/j.jiec.2014.12.025 (DOI)000357225200016 ()2-s2.0-84930817863 (Scopus ID)
Available from: 2015-03-06 Created: 2015-03-06 Last updated: 2017-12-04Bibliographically approved
Hokkanen, S., Repo, E., Johansson Westholm, L., Lou, S., Sainio, T. & Sillanpää, M. (2014). Adsorption of Ni2+, Cd2+, PO4 3- and NO3 - from aqueous solutions by nanostructured microfibrillated cellulose modified with carbonated hydroxyapatite. Chemical Engineering Journal, 252, 64-74
Open this publication in new window or tab >>Adsorption of Ni2+, Cd2+, PO4 3- and NO3 - from aqueous solutions by nanostructured microfibrillated cellulose modified with carbonated hydroxyapatite
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2014 (English)In: Chemical Engineering Journal, ISSN 1385-8947, Vol. 252, p. 64-74Article in journal (Refereed) Published
Abstract [en]

The adsorption of Ni2+, Cd2+, PO4 3- and NO3 - by carbonated hydroxyapatite (CHA) modified microfibrillated cellulose (MFC) was studied in the aqueous solution. The modified adsorbent was characterized using elemental analysis, FTIR, SEM and EDAX analysis. The adsorption studies were conducted in batch mode. The effects of pH, contact time, the concentration of metals and the regeneration efficiency were studied. The removal of Ni2+, Cd2+, PO4 3- and NO3 - was not pH dependent. The maximum removal capacities of the CHA/MFC adsorbent for Ni2+, Cd2+, PO4 3- and NO3 - were 2.021, 1.224, 0.843 and 0.209mmol/g, respectively. The Langmuir and Sips models were representative to simulate adsorption isotherms. The results of adsorption kinetic indicate that adsorption was very fast for all studied compounds.

Keywords
Adsorption, Carbonated hydroxyapatite (CHA), Isotherms, Nanocellulose, Water treatment
National Category
Engineering and Technology Natural Sciences
Identifiers
urn:nbn:se:mdh:diva-25228 (URN)10.1016/j.cej.2014.04.101 (DOI)000339601000009 ()2-s2.0-84901198503 (Scopus ID)
Available from: 2014-06-13 Created: 2014-06-13 Last updated: 2016-05-13Bibliographically approved
Johansson Westholm, L., Repo, E. & Sillanpää, M. (2014). Filter materials for metal removal from mine drainage-a review. Environmental science and pollution research international, 21(15), 9109-9128
Open this publication in new window or tab >>Filter materials for metal removal from mine drainage-a review
2014 (English)In: Environmental science and pollution research international, ISSN 0944-1344, E-ISSN 1614-7499, Vol. 21, no 15, p. 9109-9128Article in journal (Refereed) Published
Abstract [en]

A large number of filter materials, organic and inorganic, for removal of heavy metals in mine drainage have been reviewed. Bark, chitin, chitosan, commercial ion exchangers, dairy manure compost, lignite, peat, rice husks, vegetal compost, and yeast are examples of organic materials, while bio-carbons, calcareous shale, dolomite, fly ash, limestone, olivine, steel slag materials and zeolites are examples of inorganic materials. The majority of these filter materials have been investigated in laboratory studies, based on various experimental set-ups (batch and/or column tests) and different conditions. A few materials, for instance steel slag materials, have also been subjects to field investigations under real-life conditions. The results from these investigations show that steel slag materials have the potential to remove heavy metals under different conditions. Ion exchange has been suggested as the major metal removal mechanisms not only for steel slag but also for lignite. Other suggested removal mechanisms have also been identified. Adsorption has been suggested important for activated carbon, precipitation for chitosan and sulphate reduction for olivine. General findings indicate that the results with regard to metal removal vary due to experimental set ups, composition of mine drainage and properties of filter materials and the discrepancies between studies renders normalisation of data difficult. However, the literature reveals that Fe, Zn, Pb, Hg and Al are removed to a large extent. Further investigations, especially under real-life conditions, are however necessary in order to find suitable filter materials for treatment of mine drainage. 

Keywords
Adsorption, Inorganic materials, Metal removal, Mining wastewater, Normalisation, Organic materials
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:mdh:diva-25796 (URN)10.1007/s11356-014-2903-y (DOI)000340460500017 ()24781327 (PubMedID)2-s2.0-84905715717 (Scopus ID)
Available from: 2014-08-20 Created: 2014-08-20 Last updated: 2017-12-05Bibliographically approved
Nilsson, C., Renman, G., Johansson Westholm, L., Renman, A. & Drizo, A. (2013). Effect of organic load on phosphorus and bacteria removal from wastewater using alkaline filter materials. Water Research, 47(16), 6289-6297
Open this publication in new window or tab >>Effect of organic load on phosphorus and bacteria removal from wastewater using alkaline filter materials
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2013 (English)In: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 47, no 16, p. 6289-6297Article in journal (Refereed) Published
Abstract [en]

The organic matter released from septic tanks can disturb the subsequent step in on-site wastewater treatment such as the innovative filters for phosphorus removal. This study investigated the effect of organic load on phosphorus (P) and bacteria removal by reactive filter materials under real-life treatment conditions. Two long-term column experiments were conducted at very short hydraulic residence times (average ~5.5h), using wastewater with high (mean ~120mgL-1) and low (mean ~20mgL-1) BOD7 values. Two alkaline filter materials, the calcium-silicate material Polonite and blast furnace slag (BFS), were tested for the removal capacity of total P, total organic carbon (TOC) and Enterococci. Both experiments showed that Polonite removed P significantly (p<0.01) better than BFS. An increase in P removal efficiency of 29.3% was observed for the Polonite filter at the lower concentration of BOD7 (p<0.05). Polonite was also better than BFS with regard to removal of TOC, but there were no significant differences between the two filter materials with regard to removal of Enterococci. The reduction in Enterococci was greater in the experiment using wastewater with high BOD7, an effect attributable to the higher concentration of bacteria in that wastewater. Overall, the results demonstrate the importance of extensive pre-treatment of wastewater to achieve good phosphorus removal in reactive bed filters and prolonged filter life.

Place, publisher, year, edition, pages
Elsevier, 2013
National Category
Engineering and Technology
Identifiers
urn:nbn:se:mdh:diva-21937 (URN)10.1016/j.watres.2013.08.001 (DOI)000326910000031 ()2-s2.0-84885371045 (Scopus ID)
Available from: 2013-10-14 Created: 2013-10-14 Last updated: 2017-12-06Bibliographically approved
Johansson Westholm, L., Drizo, A. & Renman, G. (2011). The use of blast furnace and electric arc furnace steel slag in water pollution control. In: Proceedings of the 6th European Slag Conference, 20-22 October, Madrid, Spain: . Paper presented at 6th European Slag Conference, 20-22 October, 2011, Madrid, Spain (pp. 103-113).
Open this publication in new window or tab >>The use of blast furnace and electric arc furnace steel slag in water pollution control
2011 (English)In: Proceedings of the 6th European Slag Conference, 20-22 October, Madrid, Spain, 2011, p. 103-113Conference paper, Published paper (Refereed)
Abstract [en]

Filter technology has proved to be successful with regard to removal of pollutants from varying wastewater streams. A large number of filter materials have been investigated with promising results, among them several steel and iron slag materials. However, despite significant scientific evidence over the past 15 years on the efficiency of steel slag in P removal in particular from a variety of wastewaters around the world, currently there are very few full-scale steel slag filters in operation. In this paper we will present research efforts and experiences in using blast furnace slag in Sweden and electric arc furnace steel slag in Vermont, USA and hindrances faced in obtaining regulatory approvals for this innovative technology.

Series
Euroslag Publication, ISSN 1617-5867 ; 5
National Category
Other Engineering and Technologies
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-21803 (URN)
Conference
6th European Slag Conference, 20-22 October, 2011, Madrid, Spain
Available from: 2013-10-07 Created: 2013-10-07 Last updated: 2016-01-14Bibliographically approved
Johansson Westholm, L. (2010). The Use of Blast Furnace Slag for Removal of Phosphorus from Wastewater in Sweden—A Review. Water, 2(4), 826-837
Open this publication in new window or tab >>The Use of Blast Furnace Slag for Removal of Phosphorus from Wastewater in Sweden—A Review
2010 (English)In: Water, ISSN 2073-4441, Vol. 2, no 4, p. 826-837Article in journal (Refereed) Published
Abstract [en]

 Research on Phosphorus (P) removal capacity by blast furnace slags (BFS) has been undertaken in Sweden for the last decade. Both laboratory experiments and field trials have been carried out. While laboratory investigations revealed that BFS has a high P-sorption capacity (95–100%), P removal in field trials was much lower, ranging from 40 to 53%. In addition, a number of problems have been observed in BFS field testing including clogging, sulfuric odor and environmental (regulatory) concerns about possible leaching of heavy metals from the slag. In spite of these problems, and questioning by the environmental regulatory authorities, research continues to provide evidence that BFS can be regarded as a suitable filter media, and attempts have also been undertaken in order to further improve the P-removal capacity of this adsorbing material.

Place, publisher, year, edition, pages
MPDI: MPDI Publishing, Switzerland, 2010
National Category
Other Environmental Engineering
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-11765 (URN)10.3390/w2040826 (DOI)000208555800007 ()
Available from: 2011-02-07 Created: 2011-02-07 Last updated: 2014-06-17Bibliographically approved
Nehrenheim, E., Rodriguez, A., Odlare, M. & Johansson Westholm, L. (2009). Wastewater phosphorous removal by blast furnace slag: Laboratory and field investigations in Sweden. In: : . Paper presented at IWA Specialist conference, Nov 11-14 Kathmandu, Nepal.
Open this publication in new window or tab >>Wastewater phosphorous removal by blast furnace slag: Laboratory and field investigations in Sweden
2009 (English)Conference paper, Published paper (Refereed)
National Category
Engineering and Technology
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-10237 (URN)
Conference
IWA Specialist conference, Nov 11-14 Kathmandu, Nepal
Projects
BIOREXCLEAN
Available from: 2010-09-03 Created: 2010-09-03 Last updated: 2013-12-17Bibliographically approved
Nehrenheim, E., Waara, S. & Johansson Westholm, L. (2008). Metal retention on pine bark and blast furnace slag - on-site experiment for treatment of low strenght landfill leachate. Bioresource Technology, 99(5), 998-1005
Open this publication in new window or tab >>Metal retention on pine bark and blast furnace slag - on-site experiment for treatment of low strenght landfill leachate
2008 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 99, no 5, p. 998-1005Article in journal (Refereed) Published
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.  

National Category
Engineering and Technology
Identifiers
urn:nbn:se:mdh:diva-4076 (URN)10.1016/j.biortech.2007.03.006 (DOI)000253250900013 ()2-s2.0-37049029593 (Scopus ID)
Available from: 2007-03-26 Created: 2007-03-26 Last updated: 2017-12-14Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-0231-564X

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