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Biochar produced from wood waste for soil remediation in Sweden: Carbon sequestration and other environmental impacts

Papageorgiou, Asterios and Azzi, Elias S. and Enell, Anja and Sundberg, Cecilia (2021). Biochar produced from wood waste for soil remediation in Sweden: Carbon sequestration and other environmental impacts. Science of the Total Environment. 776 , 145953
[Research article]

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Abstract

The use of biochar to stabilize soil contaminants is emerging as a technique for remediation of contaminated soils. In this study, an environmental assessment of systems where biochar produced from wood waste with energy recovery is used for remediation of soils contaminated with polycyclic aromatic hydrocarbons (PAH) and metal(loid)s was performed. Two soil remediation options with biochar (on-and off-site) are considered and compared to landfilling. The assessment combined material and energy flow analysis (MEFA), life cycle assess-ment (LCA), and substance flow analysis (SFA). The MEFA indicated that on-site remediation can save fuel and backfill material compared to off-site remediation and landfilling. However, the net energy production by pyrol-ysis of wood waste for biochar production is 38% lower than incineration. The LCA showed that both on-site and off-site remediation with biochar performed better than landfilling in 10 of the 12 environmental impact catego-ries, with on-site remediation performing best. Remediation with biochar provided substantial reductions in cli-mate change impact in the studied context, owing to biochar carbon sequestration being up to 4.5 times larger than direct greenhouse gas emissions from the systems. The two biochar systems showed increased impacts only in ionizing radiation and fossils because of increased electricity consumption for biochar production. They also resulted in increased biomass demand to maintain energy production. The SFA indicated that leaching of PAH from the remediated soil was lower than from landfilled soil. For metal(loid)s, no straightforward conclusion could be made, as biochar had different effects on their leaching and for some elements the results were sensitive to water infiltration assumptions. Hence, the reuse of biocharremediated soils requires further evaluation, with site-specific information. Overall, in Sweden's current context, the biochar remediation technique is an environmentally promising alternative to landfilling worth investigating further.(c) 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/).

Authors/Creators:Papageorgiou, Asterios and Azzi, Elias S. and Enell, Anja and Sundberg, Cecilia
Title:Biochar produced from wood waste for soil remediation in Sweden: Carbon sequestration and other environmental impacts
Series Name/Journal:Science of the Total Environment
Year of publishing :2021
Volume:776
Article number:145953
Number of Pages:13
Publisher:ELSEVIER
ISSN:0048-9697
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
Keywords:Metal(loid)s, Polycyclic aromatic hydrocarbons, Material and energy flow analysis, Life cycle assessment, Substance flow analysis
URN:NBN:urn:nbn:se:slu:epsilon-p-112072
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-112072
Additional ID:
Type of IDID
DOI10.1016/j.scitotenv.2021.145953
Web of Science (WoS)000647601500011
ID Code:24378
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Energy and Technology
Deposited By: SLUpub Connector
Deposited On:03 Jun 2021 11:03
Metadata Last Modified:03 Jun 2021 11:11

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