The impact of landfilling and composting on greenhouse gas emissions – A review

• Published in: Bioresource technology 2009-08, Vol.100 (16), p.3792-3798
• Main Authors: Lou, X.F., Nair, J.
• Format: Article
• Language: English
• Subjects: Applied sciences; Bacteria, Anaerobic - metabolism; Biological and medical sciences; Biological treatment of sewage sludges and wastes; Biotechnology; carbon dioxide; Carbon Dioxide - metabolism; carbon sequestration; Composting; degradation; Environment and pollution; Exact sciences and technology; Fundamental and applied biological sciences. Psychology; Greenhouse Effect; Greenhouse gas; greenhouse gases; Industrial applications and implications. Economical aspects; Landfilling; landfills; literature reviews; methane; Methane - metabolism; MSW composts; Municipal solid waste; Pollution; Refuse Disposal - methods; Soil - analysis; Waste management; Wastes
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2008.12.006

Municipal solid waste is a significant contributor to greenhouse gas emissions through decomposition and life-cycle activities processes. The majority of these emissions are a result of landfilling, which remains the primary waste disposal strategy internationally. As a result, countries have been incorporating alternative forms of waste management strategies such as energy recovery from landfill gas capture, aerobic landfilling (aerox landfills), pre-composting of waste prior to landfilling, landfill capping and composting of the organic fraction of municipal solid waste. As the changing global climate has been one of the major environmental challenges facing the world today, there is an increasing need to understand the impact of waste management on greenhouse gas emissions. This review paper serves to provide an overview on the impact of landfilling (and its various alternatives) and composting on greenhouse gas emissions taking into account streamlined life cycle activities and the decomposition process. The review suggests greenhouse gas emissions from waste decomposition are considerably higher for landfills than composting. However, mixed results were found for greenhouse gas emissions for landfill and composting operational activities. Nonetheless, in general, net greenhouse gas emissions for landfills tend to be higher than that for composting facilities.