堆体覆盖物对城市污泥堆肥保氮效果研究

摘要

Bentonite and wormcast were used as mulching material, and indoor simulation experiments were carried out to study the effect of the superstratum of pile on preserving nitrogen during municipal sludge composting. The results showed that wormcast combined with bentonite could play a good role in preserving nitrogen during municipal sludge composting. The effect of covering the pile with wormcast firstly and bentonite secondly was better than that of covering the pile with bentonite firstly and wormcast secondly. Compared to control, the accumulative amount of ammonia emission of the treatment of covering the pile with wormcast firstly and with bentonite secondly decreased by 79. 58%.%以城市污泥和面包虫屎为堆肥物料,选取膨润土和蚯蚓粪作为堆体覆盖物,采用室内模拟堆肥方法,研究了堆体覆盖物在堆肥过程中的保氮效果.结果表明:联合使用膨润土和蚯蚓粪可以起到较好的保氮作用,并且堆肥物料表面先覆盖蚯蚓粪再覆盖膨润土的效果优于先覆盖膨润土再覆盖蚯蚓粪,其7d的NH3累积释放量较对照降低79.58％.