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Effects of moisture on emissions of methane, nitrous oxide and carbon dioxide from food and garden waste composting
Swedish Univ Agr Sci SLU, Dept Energy & Technol, Box 7032, SE-75007 Uppsala, Sweden..
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Resources, Energy and Infrastructure. Swedish Univ Agr Sci SLU, Dept Energy & Technol, Box 7032, SE-75007 Uppsala, Sweden..ORCID iD: 0000-0001-5979-9521
Swedish Univ Agr Sci SLU, Dept Mol Sci, Box 7015, SE-75007 Uppsala, Sweden..
Swedish Univ Agr Sci SLU, Dept Energy & Technol, Box 7032, SE-75007 Uppsala, Sweden..
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2019 (English)In: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 240, article id UNSP 118165Article in journal (Refereed) Published
Abstract [en]

Globally, waste generation is continually increasing, with landfill as the main destination for biological waste. Composting is a simple alternative for handling waste, but when poorly managed poses a risk of greenhouse gas emissions. The moisture content of substrate affects emissions of methane (CH4) and nitrous oxide (N2O) from composting, but the scale and mechanisms behind these effects are poorly understood. This study examined effects of different moisture levels (44-66%) on CH4, N2O and carbon dioxide (CO2) emissions during 20 days of composting food and garden waste under controlled conditions (55 degrees C, 16% oxygen) in a 200-L reactor. Total CO2 emissions were 400-500 g CO2-C kg(-1) initial C. Total CH4 emissions were highest, 35 g CH4-C kg(-1) initial C, for the wettest substrate (66% moisture) and decreased exponentially with declining moisture content, with the lowest total emissions, 0.04 g CH4-C kg(-1) initial C, observed with the driest substrate. Total N2O emissions were negatively correlated with moisture content, decreasing from 1.2 g N2O-N kg(-1) initial N at 44% moisture to 0.3 g N2O-N kg(-1) initial N at 59%, but the wettest substrate (66% moisture) had the highest N2O emissions, 1.4 g N2O-N kg(-1) initial N. NH4-N accumulated in the wettest material, suggesting that the increased N2O emissions were due to reduced oxygen availability. The results indicate potential to reduce greenhouse gas emissions from large-scale composting by adjusting the moisture content at different stages of composting, thus lowering its overall environmental impact. This finding can be used in guidelines for large-scale composting process to avoid moisture conditions causing large greenhouse gas emissions. Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD , 2019. Vol. 240, article id UNSP 118165
Keywords [en]
Degradation, Greenhouse gas, Methane, Nitrous oxide, Reactor, Thermophilic
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:kth:diva-262929DOI: 10.1016/j.jclepro.2019.118165ISI: 000487936100114Scopus ID: 2-s2.0-85071751577OAI: oai:DiVA.org:kth-262929DiVA, id: diva2:1374193
Note

QC 20191129

Available from: 2019-11-29 Created: 2019-11-29 Last updated: 2019-11-29Bibliographically approved

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Sundberg, Cecilia

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