复合塔式生态滤池中氮素迁移转化

构建复合塔式生态滤池进行污水处理实验,对含氮污水通过系统各处理单元前后4种氮形态变化和浓度分布进行探讨。比较各单元进出水水质变化,研究各单元总氮和硝氮的去除效果以及对系统总去除率的贡献。结合装置构造特点,系统分析了氮素在复合塔式生态滤池中的迁移转化规律及除氮机制,并创新性应用δ15N-NO3-方法加以佐证。研究结果表明,复合塔式生态滤池工艺对总氮和硝氮均有很好的去除作用,实验污水中氮污染以硝氮为主,总氮去除主要取决于硝氮的去除;复合塔式生态滤池中硝化-反硝化交替作用明显,为不同形态氮的相关转化以及氮的去除创造了优越的条件。

Nitrogen transformation in compound tower ecological filter

The compound tower ecological filter was built to carry out the sewage treatment experiment.When sewage flowed through each treatment unit of the system, the variation of nitrogen forms and concentration distribution were discussed.By comparing the properties of influent and effluent, the removal efficiency of total nitrogen and nitrate in each treatment unit was studied, and the contribution of each unit to system total nitrogen removal rate was calculated.Nitrogen transformation and the mechanism of nitrogen removal in the compound tower ecological filter were analyzed systematically combining with the construction features of ecological filter, and 15N-NO3 method was used to prove the conclusion.The results showed that compound tower ecological filter could remove total nitrogen and nitrate effectively, and the removal of total nitrogen depended on the removal of nitrate, because there was high content of nitrate in the sewage.The study also indicated that compound tower ecological filter had obvious alternative action of nitrification-denitrification, which created the superior condition for the transformation of different nitrogen forms and the nitrogen removal.