Influence of Aeration on NH₃, CH₄ and N₂O Emissions during Kitchen Waste Composting

Abstract:

Because of high moisture content and compact structure, composting kitchen waste would discharge by-products such as leachate, ammonia (NH₃), and greenhouse gases, and these can cause secondary environmental pollution. In this study, continuous measurements of gas emissions were carried out and detailed gas emission patterns were obtained using forced aeration system at aerations of 2·10^-4 (T1), 4·10^-4 (A2) and 6·10^-4 ( (A3) m³·kgDM^-1·min^-1. During the experiment, temperature and oxygen content were determined, and continuous measurements of NH₃ and gaseous emissions (CH₄, N₂O, and NH₃) were taken. The results indicated that the aeration had a significant effect on NH₃, CH₄ and N₂O emission (p<0.05). The highest concentration of NH₃, CH₄ and N₂O were all observed in the treatment of T2. The productions of NH₃ were reduced by 59.6% and 33.7%, and greenhouse gases (GHG) were reduced by 50.8% and 40.5% for T1 and T2 that compared to T3, respectively. Obviously, the aeration has great influence on NH₃ and GHG emissions. In this study, the aeration was 2·10^-4 m³·kgDM^-1·min^-1 in favor of NH₃ and GHG reduction.

• Periodical: Advanced Materials Research (Volumes 864-867)
• Pages: 1904-1908
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.864-867.1904
• Online since: December 2013
• Authors: Hong Yu Zhang*, Guo Xue Li, Hong Fei Wei
• Keywords: Aeration, CH₄, Composting, Kitchen Waste, N₂O, NH₃

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