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Life cycle assessment of combination of anaerobic digestion andpyrolysis: focusing on different options for biogas use
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013).ORCID iD: 0000-0002-8300-2786
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013).ORCID iD: 0000-0002-6293-8657
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences (from 2013).ORCID iD: 0000-0003-1065-1221
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013).ORCID iD: 0000-0001-9655-9682
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2019 (English)In: Advances in Geosciences, ISSN 1680-7340, Vol. 49, p. 57-66Article in journal (Refereed) Published
Abstract [en]

The combination of anaerobic digestion and pyrolysistechnologies could be a novel energy-biochar productionsystem to maximize energy and nutrient recovery frompulp and paper mill sludge. Herein, the life-cycle energy productionand emissions reduction of sludge treatment from atypical pulp and paper mill were investigated, in which alternativeuses of biogas for industrial or household application,in different regions of the world, were assessed. Thethree scenarios considered for different end-uses of biogasare: (A) biogas for vehicle fuel in the transportation sectorin Sweden, (B) biogas for heat and electricity in the powersector in Brazil, and (C) biogas for cooking in households inChina. The results of Environmental Life-Cycle Assessment(E-LCA) show that for all these three scenarios, the use ofbiogas and pyrolysis gas contributes most to emissions mitigation,while the dewatering and drying processes carriedout on the sludge, contribute the most to the environmentalemissions. Addition of biochar to the soil, contributes significantlyto a reduction in global warming by sequesteringcarbon in the soil. Compared to scenarios B and C, ScenarioA, in which biogas substitutes gasoline in transportation, andheat from combusted pyrolysis gases is used for district heatingin Sweden, demonstrates the highest environmental performancefor all the evaluated impact categories.

Place, publisher, year, edition, pages
Copernicus GmbH , 2019. Vol. 49, p. 57-66
Keywords [en]
Biochar, paper mill sludge, forest soil, LCA
National Category
Natural Sciences
Research subject
Environmental and Energy Systems
Identifiers
URN: urn:nbn:se:kau:diva-74802DOI: 10.5194/adgeo-49-57-2019OAI: oai:DiVA.org:kau-74802DiVA, id: diva2:1352580
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FOSBEAvailable from: 2019-09-19 Created: 2019-09-19 Last updated: 2019-11-14Bibliographically approved

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Publisher's full texthttps://www.adv-geosci.net/49/57/2019/

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Mohammadi, AliGovindarajan, VenkateshSandberg, MariaEskandari, SamiehGranström, Karin

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