He Y, Inamori Y, Mizuochi M, Kong H, Iwami N, Sun T
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, PR China.
Sci Total Environ. 2000 May 24;254(1):65-74. doi: 10.1016/s0048-9697(00)00439-3.
Emissions of N2O and CH4 from an aerated composting system were investigated using small-scale simulated reactors. The results show relatively high emissions of N2O at the beginning of composting, in proportion to the application amount of food waste. After 2 days, the N2O emission decreased to 0.53 ppmv on average, near to the background level in the atmosphere (0.45 ppmv). The addition of composted cattle manure increased N2O emissions not only at the beginning of composting, but also during the later period and resulted in two peak emission curves. Good correlation was observed between the N2O concentration at the air outlet and NO2- concentration in waste, suggesting a generation pathway for N2O from NO2- to N2O. Methane was only detected in treatments containing composted cattle manure. The high emission of methane illustrates the involvement of anoxic/anaerobic microorganisms with the addition of composted manure. The result suggests the existence of anoxic or anaerobic microsite inside the waste particles even though ventilation was employed during the composting process.
使用小型模拟反应器研究了曝气堆肥系统中N2O和CH4的排放情况。结果表明，堆肥开始时N2O排放相对较高，与食物垃圾的施用量成比例。2天后，N2O排放平均降至0.53 ppmv，接近大气中的背景水平（0.45 ppmv）。添加堆肥牛粪不仅在堆肥开始时增加了N2O排放，在后期也增加了排放，并导致出现两个排放峰值曲线。在出气口的N2O浓度与废物中的NO2-浓度之间观察到良好的相关性，表明存在从NO2-到N2O的N2O生成途径。仅在含有堆肥牛粪的处理中检测到甲烷。甲烷的高排放表明添加堆肥后有缺氧/厌氧微生物参与。结果表明，尽管在堆肥过程中采用了通风措施，但废物颗粒内部仍存在缺氧或厌氧微环境。
