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Pile mixing increases greenhouse gas emissions during composting of dairy manure

Permanent URL:
http://handle.nal.usda.gov/10113/49254
Abstract:
The effect of pile mixing on greenhouse gas (GHG) emissions during dairy manure composting was determined using large flux chambers designed to completely cover replicate pilot-scale compost piles. GHG emissions from compost piles that were mixed four times during the 80day trial were approximately 20% higher than emissions from unmixed (static) piles. For both treatments, carbon dioxide (CO₂), methane (CH₄), and nitrous oxide (N₂O) accounted for 75-80%, 18-21%, and 2-4% of GHG emissions, respectively. Seventy percent of CO₂ emissions and 95% of CH₄ emissions from all piles occurred within first 23days. By contrast, 80-95% of N₂O emissions occurred after this period. Mixed and static piles released 2 and 1.6kg GHG (CO₂-Eq.) for each kg of degraded volatile solids (VS), respectively. Our results suggest that to minimize GHG emissions, farmers should store manure in undisturbed piles or delay the first mixing of compost piles for approximately 4weeks.
Author(s):
Ahn, H.K. , Mulbry, W. , White, J.W. , Kondrad, S.L.
Subject(s):
composting , dairy manure , gas emissions , greenhouse gases , carbon dioxide , methane , nitrous oxide , mixing
Format:
p. 2904-2909.
Note:
Includes references
Source:
Bioresource technology 2011 Feb., v. 102, no. 3
Language:
English
Publisher:
[New York, NY]: Elsevier Ltd.
Year:
2011
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
File:
Download [PDF File]
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.