城市污水处理厂高溶解氧尾水脱氮研究

Study on the Nitrogen Removing Capacity along the Path of Biological Denitrification Filter

本实验通过运行反硝化生物滤池中试实验装置处理城市污水处理厂尾水,研究了高溶解氧进水条件下的滤池脱氮效果,通过滤池沿程溶解氧浓度变化,沿程脱氮性能、沿程反硝化优势菌种的测定,我们得出:反硝化生物滤池去除总氮主要集中在滤池上半部分随着滤池深度减少,反硝化微生物丰度越高,反硝化微生物主要集中在滤池上半部分。通过DNA鉴定,滤池中主要有4种反硝化菌株,分别是Acidovorax sp.、Derxia、Dechloromonas sp和Thauera sp。在实际工程应用中应采取措施降低反硝化滤池进水溶解氧浓度,提高滤池缺氧区占比,提高滤池的脱氮性能。

The study accord to run the anti nitrification in a biofilter test experimental device for treatment of municipal sewage treatment plant tail water, high dissolved oxygen inhibited denitrification within the BAF process, the concentration of dissolved oxygen in the filter along the direction of the water presenting a decreasing trend, by detecting the filter along the process effluent total nitrogen was found, total nitrogen removal mainly concentrated in the filter part. According to the degradation rate can be seen as the filter depth reduction, denitrifying microbial abundance is high, denitrifying microorganisms mainly concentrated in the upper part of the filter. Through the identification of DNA filter, there are mainly 4 kinds of denitrifyingbacteria were Acidovorax sp., Derxia, Dechtoromonas sp.and Thauera sp.