城市生活垃圾好氧堆肥中氨气变化及其影响

THE CHANGE IN AMMONIA AND ITS EFFECT DURING AEROBIC COMPOSTING OF MUNICIPAL SOLID WASTES

堆肥过程中氮素损失比较严重,而氨气挥发是氮损失的主要途径。利用城市生活垃圾进行好氧堆肥,研究其堆肥过程中氨气变化规律及其对堆肥性质的影响。结果表明:在堆肥期间,氨气含量先增加后减小,最后基本稳定在5 mg/kg左右;而全氮含量先降低后增加;硝态氮含量先降低后增加;铵态氮是先快速增加,后缓慢减小至稳定;pH值先下降后升高,最终稳定在中性范围内;w(C)/w(N)先增加后下降;有机质含量显著下降。

A heavy loss of nitrogen occurs in the process of composting,whereas the ammonia volatilization is the primary path.Municipal solid wastes（MSW）composting with aerobic composting technology was studied on the change of ammonia and its effect on character of composting in the process of composting.The results showed that ammonia content had a increase after decrease till to 5 mg /kg;the dynamic variations of content of the total nitrogen first decreased and then increased;amino nitrogen content had a slow reduction after a significant increase until a stabilization,on the contrary,nitrate nitrogen content first decreased and then increased;pH appeared decreased first and then increased till neutral state;C /N ratio showed reduction first and then increased;organic matter content decreased obviously during the composting.