摘要
采用静态好氧工艺研究了含氮量分别为32.4g·kg-1、45.3g·kg-1和58.2g·kg-1的厨余垃圾(N0、N1、N2)与木屑混合堆制时,堆肥过程中不同形态氮的转化及其氮损失规律.结果表明,堆肥中堆体全氮含量呈先升后降趋势,部分有机氮转化为铵氮导致堆体pH升高,在通风和高温的联合作用下,NH3挥发出堆体造成一定的氮损失.随着底物含氮量的增加,NH3挥发速率和氮损失率均呈上升趋势.堆肥结束时N0、N1、N2的堆体全氮含量分别下降了16.4%、26.3%和21.7%,NH3累计挥发量分别为7.0g·kg-1、9.8g·kg-1和29.4g·kg-1,堆肥氮损失率分别为35·0%、49.9%和53.0%.NH3挥发主要集中在高温阶段的中后期,是厨余堆肥氮损失的主要原因.
This study investigated nitrogen transformation and loss during the composting of food wastes with added sawdust. Three kinds of food wastes （ defined as N0 , N1 and N2 ） were used, containing 32.4 g·kg^-1,45.3 g·kg^-1 and 58.2 g·kg^-1 of nitrogen. An aerated static pile compost system was employed to compost the food wastes. The results showed that total nitrogen in the compost first increased and then decreased. Part of the organic nitrogen was transformed into ammonium and which resulted in increased pH of the composting pile. Under the combined effect of high temperature and ventilation, ammonia volatilization from the pile led to nitrogen loss. As the nitrogen content in the food wastes increased, the rate of ammonia emissions and amount of nitrogen loss from the pile was also enhanced. At the end of eomposting, the accumulated ammonia emissions from all three food wastes, N0, N1 and N2, were 7.0g·kg^-1 , 9. 8 g·kg^-1 and 29.4 g·kg^-1 , respectively. The content of total nitrogen decreased by 16.4% , 26. 3% and 21. 7% , respectively. The lost amount of nitrogen was 35.0% , 49.9% and 53.0% of the initial total nitrogen amount. Most ammonia volatilization took place in the intermediate and later composting phases at high temperature. Nitrogen losses were attributed mostly to ammonia volatilization.
出处
《环境科学学报》
CAS
CSCD
北大核心
2007年第6期993-999,共7页
Acta Scientiae Circumstantiae
基金
国家高技术研究发展计划(863)项目(No.2001AA644020)
国家重点基础研究发展规划(973)项目(No.2005CB724203)~~
关键词
厨余垃圾
堆肥
氮素转化
氨挥发
ood wastes
composting
nitrogen transformation
ammonia volatilization
