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Ejlertsson, Jörgen
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Publications (10 of 44) Show all publications
Magnusson, B., Ekstrand, E.-M., Karlsson, A. & Ejlertsson, J. (2018). Combining high-rate aerobic wastewater treatment with anaerobic digestion of waste activated sludge at a pulp and paper mill. Water Science and Technology, 77(8), 2068-2076
Open this publication in new window or tab >>Combining high-rate aerobic wastewater treatment with anaerobic digestion of waste activated sludge at a pulp and paper mill
2018 (English)In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732, Vol. 77, no 8, p. 2068-2076Article in journal (Refereed) Published
Abstract [en]

The activated sludge process within the pulp and paper industry is generally run to minimize the production of waste activated sludge (WAS), leading to high electricity costs from aeration and relatively large basin volumes. In this study, a pilot-scale activated sludge process was run to evaluate the concept of treating the wastewater at high rate with a low sludge age. Two 150 L containers were used, one for aeration and one for sedimentation and sludge return. The hydraulic retention time was decreased from 24 hours to 7 hours, and the sludge age was lowered from 12 days to 2–4 days. The methane potential of the WAS was evaluated using batch tests, as well as continuous anaerobic digestion (AD) in 4 L reactors in mesophilic and thermophilic conditions. Wastewater treatment capacity was increased almost four-fold at maintained degradation efficiency. The lower sludge age greatly improved the methane potential of the WAS in batch tests, reaching 170 NmL CH4/g VS at a sludge age of 2 days. In addition, the continuous AD showed a higher methane production at thermophilic conditions. Thus, the combination of high-rate wastewater treatment and AD of WAS is a promising option for the pulp and paper industry.

Keywords
Activated sludge, sludge age, anaerobic digestion, biochemical methane potential, CSTR, pulp and paper
National Category
Bioprocess Technology
Identifiers
urn:nbn:se:liu:diva-146089 (URN)10.2166/wst.2018.120 (DOI)29722692 (PubMedID)
Available from: 2018-05-07 Created: 2018-05-07 Last updated: 2018-05-31Bibliographically approved
Ometto, F., Berg, A., Björn, A., Safaric, L., Svensson, B. H., Karlsson, A. & Ejlertsson, J. (2018). Inclusion of Saccharina latissima in conventional anaerobic digestion systems. Environmental technology, 39(5), 628-639
Open this publication in new window or tab >>Inclusion of Saccharina latissima in conventional anaerobic digestion systems
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2018 (English)In: Environmental technology, ISSN 0959-3330, E-ISSN 1479-487X, Vol. 39, no 5, p. 628-639Article in journal (Refereed) Published
Abstract [en]

Loading macroalgae into existing anaerobic digestion (AD) plants allows us to overcome challenges such as low digestion efficiencies, trace elements limitation, excessive salinity levels and accumulation of volatile fatty acids (VFAs), observed while digesting algae as a single substrate. In this work, the co-digestion of the brown macroalgae Saccharina latissima with mixed municipal wastewater sludge (WWS) was investigated in mesophilic and thermophilic conditions. The hydraulic retention time (HRT) and the organic loading rate (OLR) were fixed at 19 days and 2.1 g l-1 d-1of volatile solids (VS), respectively. Initially, WWS was digested alone. Subsequently, a percentage of the total OLR (20%, 50% and finally 80%) was replaced by S. latissima biomass. Optimal digestion conditions were observed at medium-low algae loading (=50% of total OLR) with an average methane yield close to [Formula: see text] and [Formula: see text] in mesophilic and thermophilic conditions, respectively. The conductivity values increased with the algae loading without inhibiting the digestion process. The viscosities of the reactor sludges revealed decreasing values with reduced WWS loading at both temperatures, enhancing mixing properties.

Place, publisher, year, edition, pages
Taylor & Francis, 2018
Keywords
Seaweed; biomethane; co-digestion; salinity; viscosity
National Category
Water Treatment
Identifiers
urn:nbn:se:liu:diva-146067 (URN)10.1080/09593330.2017.1309075 (DOI)000427166700008 ()28317451 (PubMedID)2-s2.0-85017127668 (Scopus ID)
Available from: 2018-03-27 Created: 2018-03-27 Last updated: 2018-06-13Bibliographically approved
Larsson, M., Truong, X.-b., Björn, A., Ejlertsson, J., Svensson, B., Bastviken, D. & Karlsson, A. (2017). Anaerobic digestion of wastewater from the production of bleached chemical thermo-mechanical pulp: higher methane production for hardwood than softwood. Journal of chemical technology and biotechnology (1986), 2(1), 140-151
Open this publication in new window or tab >>Anaerobic digestion of wastewater from the production of bleached chemical thermo-mechanical pulp: higher methane production for hardwood than softwood
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2017 (English)In: Journal of chemical technology and biotechnology (1986), ISSN 0268-2575, E-ISSN 1097-4660, Vol. 2, no 1, p. 140-151Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: Chemical thermo-mechanical pulp (CTMP) mills holds a large biomethane potential in their wastewater. Their broadened market has involved increased bleaching and utilisation of different raw materials. Therefore, the main aim of this study was to obtain and maintain a stable anaerobic digestion (AD) process, with a high methane yield and total organic carbon (TOC) reduction, when digesting CTMP wastewater, from different production protocols including shifts in raw material and bleaching. A lab-scale upflow anaerobic sludge bed (UASB) reactor was used for the tests.

RESULTS: The variations in raw material (aspen, birch and spruce) and consequently in TOC-loading (3.6-6.6 kg TOC m-3 and day-1) did not affect the UASB process negatively. Methane production values from 360 to 500 NmL g TOC-1 were obtained, with the highest yield for wastewater from the production of birch- followed by aspenand spruce pulp. The acetic acid and fTOC reduction ranged 90 to 95% and 61 to 73%, respectively.

CONCLUSIONS: The stable process performance maintained during shifts in raw material for pulp production show that AD is feasible for CTMP mills with a diversified product portfolio. Furthermore, the increased use of hardwood and bleaching will most likely increase their potential as a biomethane producer.

Place, publisher, year, edition, pages
John Wiley & Sons, 2017
Keywords
biogas, wastewater treatment, UASB, CTMP, softwood, hardwood
National Category
Water Engineering
Identifiers
urn:nbn:se:liu:diva-122338 (URN)10.1002/jctb.4980 (DOI)000389443600017 ()
Funder
Swedish Energy Agency, 32802–1
Note

At the time for thesis presentation publication was in status: Manuscript

At the time for thesis presentation manuscript was named: Anaerobic digestion of wastewater from the production of bleached chemical thermo-mechanical pulp: The effect of changes in raw material composition

Funding agencies: Swedish Energy Agency [32802-1]; Scandinavian Biogas Fuels AB; Poyry Sweden AB; BillerudKorsnas AB; Purac AB; SCA

Available from: 2015-10-29 Created: 2015-10-29 Last updated: 2017-12-18Bibliographically approved
Björn, A., Borgström, Y., Ejlertsson, J., Karlsson, A., Nilsson, F. & Svensson, B. (2016). Biogasproduktion inom svensk pappers- och massaporduktion : Syntes av möjligheter och begränsningar samt teknisk utvärdering: Bilaga 2 Etablering/effektivisering av biogasproduktion inom svensk pappers- och massaindustri. Linköping: Linköping University Electronic Press
Open this publication in new window or tab >>Biogasproduktion inom svensk pappers- och massaporduktion : Syntes av möjligheter och begränsningar samt teknisk utvärdering: Bilaga 2 Etablering/effektivisering av biogasproduktion inom svensk pappers- och massaindustri
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2016 (Swedish)Report (Other academic)
Abstract [sv]

Linköpings Universitet har tillsammans med Pöyry och Scandinavian Biogas Fuels drivit projektet ”Etablering/effektivisering av  biogasproduktion inom svensk pappers- och massaproduktion”. Potentialen hos det organiska materialet i avloppsvatten från svensk pappers- och massaindustri (PMI) till biogasproduktion skattades vid projektstart till 100 milj. Nm3 metan per år (1 TWh). Denna rapport är en syntes av resultaten från projektet med syfte att ge visa hur de genererade resultaten kan omsättas i teknisk praktik med tillhörande ekonomiska insatser. Syftet är att ge underlag och stöd till PMI-branschen och externa intressenter, som överväger att implementera biogasproduktion inom PMI.

Substraten för biogasproduktion som återfinns i pappers- och massaindustrins avloppsvatten och slam kännetecknas av stora volymer med låga COD-halter. Detta kräver rötningstekniker, som tillåter mycket korta uppehållstider jämfört med mer traditionellt utformade biogasanläggningar för att inte tankstorleken ska bli för stor. Två tekniker, som utvecklats inom projektet, klarar detta: EGSB (expanded granular sludge bed) och CSTR (completely stirred tank reactor) med slamåterföring. Dessa tekniker har därför utvärderats för tre olika typbruk, ett CTMP-bruk, ett TMP-bruk och ett sulfatmassabruk. Resultaten från dessa experimentella studier är utgångspunkten för i utvärderingen i föreliggande rapport. För varje processkoncept har en grov kostnadsuppskattning (±20 %) gjorts för den investering som krävs för biogasproduktion.

En EGSB på ett TMP-bruk med ett totalavlopp på 1500 m3/h, där hela blekeriavloppet från peroxidblekningen och en del av det övriga avloppet behandlas i en 4000 m3 reaktor förväntas ge 2,5 milj Nm3 metan/år. Investeringskostnaden för anläggningen uppskattas till 75 milj. SEK (±20 %).

En EGSB på ett CTMP-bruk med ett totalavlopp på 170 m3/h där hela avloppet behandlas i en 3000 m3 reaktor förväntas ge 1,8 milj Nm3 metan/år. Investeringskostnaden för anläggningen uppskattas till 64 milj. SEK (±20%).

En CSTR med slamåterföring som körs på bioslam från ett sulfatmassabruk där ett bioslamflöde på 46 m3/h behandlas i en 4000 m3 reaktor förväntas ge 1,0 milj Nm3 metan/år. I denna design är strategin för den aeroba bioreningen ändrad för att producera ett bioslam optimerat för att ge högsta möjliga biogaspotential. Detta innebär produktion av större mängd slam, som i största mån kan rötas till metan, dvs mängd metan per mängd rötat organiskt material samtidigt som COD-reduktionen i vattenreningen bibehålls. Investeringskostnaden för anläggningen uppskattas till 32 milj. SEK (±20%).

Baserat på de COD-kvantiteter som når de luftade dammarna inom PMIs vattenreningssystem förbrukas årligen ca 0,8 TWh el. Införande av biogasproduktion i massaindustrins spillvattenrening skulle reducera mängden COD med mellan 30-50%, vilket får till följd att den årliga elförbrukningen i samband med den aeroba reningen går ner med ca 0,2-0,4 TWh. Detta innebär alltså ett energitillskott av 0,9 – 1,1 TWh givet att hela den tillgängliga biogaspotentialen skulle byggas ut. Till detta kommer eventuella vinster relaterade till slamhanteringen.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2016. p. 26
National Category
Environmental Sciences Environmental Biotechnology Energy Engineering Social Sciences Interdisciplinary
Identifiers
urn:nbn:se:liu:diva-127126 (URN)
Available from: 2016-04-14 Created: 2016-04-14 Last updated: 2018-01-10Bibliographically approved
Moestedt, J., Nordell, E., Shakeri Yekta, S., Lundgren, J., Marti, M., Sundberg, C., . . . Björn, A. (2016). Effects of trace element addition on process stability during anaerobic co-digestion of OFMSW and slaughterhouse waste. Waste Management, 47(Pt A), 11-20
Open this publication in new window or tab >>Effects of trace element addition on process stability during anaerobic co-digestion of OFMSW and slaughterhouse waste
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2016 (English)In: Waste Management, ISSN 0956-053X, E-ISSN 1879-2456, Vol. 47, no Pt A, p. 11-20Article in journal (Refereed) Published
Abstract [en]

This study used semi-continuous laboratory scale biogas reactors to simulate the effects of trace-element addition in different combinations, while degrading the organic fraction of municipal solid waste and slaughterhouse waste. The results show that the combined addition of Fe, Co and Ni was superior to the addition of only Fe, Fe and Co or Fe and Ni. However, the addition of only Fe resulted in a more stable process than the combined addition of Fe and Co, perhaps indicating a too efficient acidogenesis and/or homoacetogenesis in relation to a Ni-deprived methanogenic population. The results were observed in terms of higher biogas production (+9%), biogas production rates (+35%) and reduced VFA concentration for combined addition compared to only Fe and Ni. The higher stability was supported by observations of differences in viscosity, intraday WA-and biogas kinetics as well as by the 16S rRNA gene and 16S rRNA of the methanogens.(c) 2015 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2016
Keywords
Trace elements; Anaerobic digestion; OFMSW; Methanogenic population; Viscosity
National Category
Renewable Bioenergy Research Environmental Sciences related to Agriculture and Land-use
Identifiers
urn:nbn:se:liu:diva-124642 (URN)10.1016/j.wasman.2015.03.007 (DOI)000367857900003 ()25827257 (PubMedID)
Note

Funding Agencies|Swedish Energy Agency; Linkoping University; Tekniska verken i Linkoping AB; Scandinavian Biogas Fuels AB; NSR AB; Kemira OYJ

Available from: 2016-02-08 Created: 2016-02-08 Last updated: 2018-01-10
Larsson, M., Truong, X.-b., Björn, A., Ejlertsson, J., Bastviken, D., Svensson, B. & Karlsson, A. (2015). Anaerobic digestion of alkaline bleaching wastewater from a Kraft pulp and paper mill using UASB technique. Environmental technology, 36(12), 1489-1498
Open this publication in new window or tab >>Anaerobic digestion of alkaline bleaching wastewater from a Kraft pulp and paper mill using UASB technique
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2015 (English)In: Environmental technology, ISSN 0959-3330, E-ISSN 1479-487X, Vol. 36, no 12, p. 1489-1498Article in journal (Refereed) Published
Abstract [en]

Anaerobic digestion of alkaline kraft elemental chlorine-free bleaching wastewater in two mesophilic, lab-scale upflow anaerobic sludge bed reactors resulted in significantly higher biogas production (250 ± 50 vs. 120 ± 30 NmL g [Formula: see text]) and reduction of filtered total organic carbon (fTOC) (60 ± 5 vs. 43 ± 6%) for wastewater from processing of hardwood (HW) compared with softwood (SW). In all cases, the gas production was likely underestimated due to poor gas separation in the reactors. Despite changes in wastewater characteristics, a stable anaerobic process was maintained with hydraulic retention times (HRTs) between 7 and 14 h. Lowering the HRT (from 13.5 to 8.5 h) did not significantly affect the process, and the stable performance at 8.5 h leaves room for further decreases in HRT. The results show that this type of wastewater is suitable for a full-scale implementation, but the difference in methane potential between SW and HW is important to consider both regarding process dimensioning and biogas yield optimization.

Place, publisher, year, edition, pages
Taylor & Francis: STM, Behavioural Science and Public Health Titles, 2015
Keywords
UASB; alkaline kraft ECF bleaching wastewater; anaerobic digestion; hardwood; softwood
National Category
Water Engineering
Identifiers
urn:nbn:se:liu:diva-114883 (URN)10.1080/09593330.2014.994042 (DOI)000350448200002 ()25441833 (PubMedID)
Funder
Swedish Energy Agency
Available from: 2015-03-05 Created: 2015-03-05 Last updated: 2017-12-04
Larsson, M., Svedlund, M., Karlsson, M., Truong, X.-b., Ejlertsson, J., Björn, A., . . . Karlsson, A. (2015). Effects of temperature on UASB digestion of wastewater from a millproducing recovered fiberbased board. In: : . Paper presented at Green Gas Research Outlook Sweden (GGROS).
Open this publication in new window or tab >>Effects of temperature on UASB digestion of wastewater from a millproducing recovered fiberbased board
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2015 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-114900 (URN)
Conference
Green Gas Research Outlook Sweden (GGROS)
Funder
Swedish Energy Agency
Available from: 2015-03-05 Created: 2015-03-05 Last updated: 2015-03-20
Larsson, M., Ekstrand, E.-M., Truong, X.-b., Nilsson, F., Ejlertsson, J., Svensson, B., . . . Björn, A. (2015). The biomethane potential of chemical thermo-mechanical pulp wastewaters in relation to their chemical composition.
Open this publication in new window or tab >>The biomethane potential of chemical thermo-mechanical pulp wastewaters in relation to their chemical composition
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2015 (English)Manuscript (preprint) (Other academic)
Abstract [en]

This study evaluates the biomethane potential of composite pulping and bleaching chemical thermo-mechanical pulp (CTMP) wastewaters in relation to their composition of organic compounds, as well as to their sulphur contents. The biomethane potential was determined in batch experiments and the CTMP wastewaters from production of bleached spruce-, birch- and aspen pulp and unbleached spruce pulp were analysed for dissolved lignin, carbohydrates, wood extractives, acetic acid and total sulphur content. The biomethane potential obtained for the wastewaters ranged from 350 to 670 NmL g TOC-1 with the highest yield for wastewater from the production of bleached birch CTMP followed by bleached aspen-, bleached spruce- and unbleached spruce CTMP. The main differences in wastewater composition were related to the raw material used for the pulp production, i.e. softwood vs. hardwood. The compounds mainly promoting the biomethane production were acetic acid, xylose, wood extractives, triglycerides and steryl esters, whereas dissolved lignin, sulphur, arabinose, mannose, lignans and free fatty-/resin acids lowered the potential. However, the individual contribution of each variable was not possible to evaluate due to covariations among them.

Keywords
CTMP; bleaching; softwood; hardwood; biomethane potential; dissolved lignin; carbohydrates; wood extractives
National Category
Water Engineering
Identifiers
urn:nbn:se:liu:diva-122339 (URN)
Available from: 2015-10-29 Created: 2015-10-29 Last updated: 2016-05-04Bibliographically approved
Larsson, M., Truong, X.-b., Ejlertsson, J., Bastviken, D., Björn, A., Svensson, B., . . . Karlsson, A. (2014). Anaerobic wastewater treatment and biogas production at TMP and CTMP mills in Sweden.. In: : . Paper presented at International Mechanical Pulping Conference (IMPC), Helsingfors, Finland, 2-5 juni, 2014.
Open this publication in new window or tab >>Anaerobic wastewater treatment and biogas production at TMP and CTMP mills in Sweden.
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2014 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-114928 (URN)
Conference
International Mechanical Pulping Conference (IMPC), Helsingfors, Finland, 2-5 juni, 2014
Funder
Swedish Energy Agency
Available from: 2015-03-05 Created: 2015-03-05 Last updated: 2015-09-21
Ejlertsson, J., Karlsson, A., Björn, A., Nilsson, F., Truong, X.-b., Magnusson, B., . . . Svensson, B. (2014). Biogas from pulp and paper industry effluents.. In: : . Paper presented at Conference on European Biogas Association (EBA), Alkmaar regionen, Nederländerna, 29 Sep – 2 Oct, 2014..
Open this publication in new window or tab >>Biogas from pulp and paper industry effluents.
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2014 (English)Conference paper, Oral presentation only (Other academic)
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-114926 (URN)
Conference
Conference on European Biogas Association (EBA), Alkmaar regionen, Nederländerna, 29 Sep – 2 Oct, 2014.
Funder
Swedish Energy Agency
Available from: 2015-03-05 Created: 2015-03-05 Last updated: 2015-09-21
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