城镇污泥蚯蚓堆肥硝化进程及其影响因素

发布时间：2018-03-16 20:50

  本文选题：城镇污泥　切入点：蚯蚓堆肥　出处：《环境科学学报》2017年08期 　论文类型：期刊论文

【摘要】：硝化是城镇污泥蚯蚓堆肥稳定化的最后一个阶段,研究硝化进程及其影响因素对减少蚯蚓堆肥过程中的NH_4~+积累、氮素损失和加快蚯蚓堆肥稳定化过程具有重要意义.文章考察了蚯蚓生物量、环境温度以及好氧条件对蚯蚓堆肥NH_4~+、NO_3~-变化的影响.结果发现,蚯蚓生物量对NH_4~+、NO_3~-含量变化影响较大,并存在显著的跃变特点,即当蚯蚓生物量超过一定数量时,会显著加快氨化和硝化速率.环境温度显著影响堆肥氨化作用,影响大小顺序为25℃20℃15℃;环境温度仅对蚯蚓堆肥硝化速率产生影响,但不改变堆肥的硝化进程.蚯蚓堆肥好氧条件对硝化影响大于对氨化的影响,好氧条件优劣不但影响硝化进程还影响硝化速率,氧环境条件好的蚯蚓堆肥硝化进程启动早,硝化速率高.
[Abstract]:Nitrification is the last stage of stabilization of earthworm compost from urban sludge. The process of nitrification and its influencing factors on reducing NH4 ~ accumulation in earthworm compost were studied. Nitrogen loss and accelerating the stabilization process of earthworm compost are of great significance. The effects of earthworm biomass, environmental temperature and aerobic conditions on the changes of NH _ 4 ~ no _ 3- in earthworm compost were investigated. The effect of earthworm biomass on NH _ 4 ~ no _ 3 ~ + content was significant, and there was a significant jump characteristic, that is, when the biomass of earthworm exceeded a certain amount, the rate of ammoniation and nitrification would be significantly accelerated, and the environmental temperature significantly affected the ammoniation of compost. The order of influence was 25 鈩，

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