Measurements of N2O from Composted Organic Wastes

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• 作者：Peter Czepiel ; Ellen Douglas ; Robert Harriss ; and Patrick Crill
• 刊名：Environmental Science & Technology
• 出版年：1996
• 出版时间：August 1996
• 年：1996
• 卷：30
• 期：8
• 页码：2519 - 2525
• 全文大小：258K
• 年卷期：v.30,no.8(August 1996)
• ISSN：1520-5851

文摘

The current atmospheric mixing ratio of nitrous oxide(N₂O), a chemically significant trace gas, isincreasing at a rate of 0.25-0.31% yr^-1,apparentlywell correlated with human activity. Better quantification of all N₂O sources is required in effortstostabilize this rate of increase. N₂O emissionsfromthe composting of wastewater sludge and livestockwastes were measured during 1993 and 1994 usingenclosure methods. Static chambers were placed onthe surface of the compost piles, and N₂Omixingratios within the chamber headspace were measuredover time from which fluxes were calculated. Theflux measurements resulted in mass-based emissionfactors of 0.7 g of N₂O (dry kg)^-1 and 0.5 gof N₂O(dry kg)^-1 for the sludge compost and thelivestockwaste compost, respectively. The derived emissionfactors were used in conjunction with recent wastegeneration and disposal statistics to estimatepotential global N₂O emissions from the treatmentoforganic wastes. Livestock waste treatment appearsto hold the greatest N₂O potential with estimatedglobalemissions of 1.2 × 10¹² g of N₂Oyr^-1.