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Title: Climate-change and health effects of using rice husk for biocharcompost: Comparing three pyrolysis systems
Contributor(s): Mohammadi, Ali (author); Cowie, Annette  (author); Anh Mai, Thi Lan (author); Brandao, Miguel (author); Anaya de la Rosa, Ruy (author); Kristiansen, Paul  (author)orcid ; Joseph, Stephen  (author)
Publication Date: 2017
DOI: 10.1016/j.jclepro.2017.06.026
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Abstract: This study presents a comparative analysis of the environmental impacts of different biochar-compost (COMBI) systems in North Vietnam relative to the conventional practice of open burning of rice husks. Three COMBI systems, using different pyrolysis technologies (pyrolytic cook-stove, brick kiln and the BigChar 2200 unit) for conversion of rice husk into biochar were modelled. Biochar was assumed to be composted with manure and straw, and the biochar-compost produced from each system was assumed to be applied to paddy rice fields. Life Cycle Assessment (LCA) showed that the three COMBI systems significantly improved environmental and health impacts of rice husk management in spring and summer compared with open burning, in terms of climate change, particulate matter (PM) and human toxicity (HT) impacts. The differences between the three COMBI systems in the climate change and PM impacts were not significant, possibly due to the large uncertainties. In all systems, the suppression of soil CH4 emissions is the major contributor to the reduced climate effect for the COMBI systems, comprising 56% in spring and 40% in summer. The greatest reduction in the HT impact was offered by the BigChar 2200 system, where biochar is produced in a large-scale plant in which pyrolysis gases are used to generate heat rather than released into the atmosphere.
Publication Type: Journal Article
Source of Publication: Journal of Cleaner Production, v.162, p. 260-272
Publisher: Elsevier BV
Place of Publication: Netherlands
ISSN: 0959-6526
Field of Research (FOR): 050204 Environmental Impact Assessment
070108 Sustainable Agricultural Development
050301 Carbon Sequestration Science
Socio-Economic Objective (SEO): 960302 Climate Change Mitigation Strategies
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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