同步硝化反硝化中试装置脱氮及微生物特性研究

Nitrogen removal and microbial characterisation for simultaneous nitrification and denitrification in a pilot study

针对国家污水排放标准进一步提高的需求,采用一种具备同步硝化反硝化功能的新型工艺,以武汉某污水处理厂市政污水为处理对象进行中试,探究了该工艺对污染物的去除效果及其同步硝化反硝化脱氮机理。并对新工艺与污水厂原氧化沟工艺的污泥样本进行微生物群落分析及功能预测。结果表明,新工艺对污水中总氮有较高的去除率,出水总氮稳定在5 mg/L以下,其同步硝化反硝化脱氮机理以好氧-缺氧微环境理论中描述的脱氮方式为主。系统长期在低溶解氧条件下运行引起污泥中菌种群落变化,对氮氧化物转化为氮气的氮循环通路有更好的转化效果。

Due to the high requirement of effluent standards in wastewater treatment,this paper evaluated a new process with simultaneous nitrification and denitrification.The effect of the process on pollutant removal and its mechanism of simultaneous nitrification and denitrification were investigated in a municipal wastewater treatment plant of Wuhan.Samples of the new process and the original oxidation ditch process sludge from the wastewater plant were also obtained for microbial community analysis and functional prediction.The results show that the new process has a high removal rate of total nitrogen from the effluent,with the total nitrogen in the effluent stabilised below 5mg/L.Its synchronous nitrification denitrification mechanism could be attributed to the aerobic-anoxic microenvironment theory.The system operates under low dissolved oxygen conditions for a long time causing changes in the bacterial community in the sludge,which has a better conversion effect on the pathway of nitrogen oxides to nitrogen gas.