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在污水处理厂进行CANON工艺小试.试验以污水处理厂A/O除磷工艺出水为基质,启动并运行CANON生物滤柱.第48 d时,反应器氨氮去除率连续10 d大于90%,总氮去除率在70%以上,CANON生物滤柱启动成功.第49~129 d,反应器内部DO控制在较低水平(0.2~0.5 mg·L~(-1)),出水几乎不含氨氮.最大出水总氮浓度为15.6 mg·L~(-1),超过一级A排放标准,硝化细菌(NOB)出现了过量增殖的现象.第129、169和213 d对滤柱进行反冲洗,使得反应器长期总氮去除率大于70%,出水总氮浓度小于12 mg·L~(-1).出水氨氮和总氮浓度达到了一级A标准,硝化细菌得到了有效抑制.结果表明,反冲洗几乎不会影响滤层结构,对滤料生物膜厚度和功能微生物活性影响较小,对硝化细菌抑制作用较大.在实际工程应用中可以通过定期反冲洗维持CANON工艺稳定运行.
The CANON process was carried out in a wastewater treatment plant.The CANON biofilter was started and operated on the A / O effluent from the wastewater treatment plant.At the 48th day, the ammonia nitrogen removal rate of the reactor was more than 90% for 10 days, The total nitrogen removal rate was over 70%, and the CANON biofilter was started successfully. During the 49th to 129th days, the DO inside the reactor was controlled at a relatively low level (0.2-0.5 mg · L -1) . The maximum concentration of total nitrogen in effluent was 15.6 mg · L -1, exceeding the effluent standard of Grade A, and overbred proliferation of nitrifying bacteria (NOB) was observed.At the 129th, 129th and 213th days, The results showed that the total nitrogen removal rate of the reactor was more than 70% and the effluent nitrogen concentration was less than 12 mg · L -1 .The effluent ammonia nitrogen and total nitrogen concentration reached the first class A standard, and the nitrifying bacteria were effectively inhibited.The results showed that, Backwash hardly affects the structure of the filter layer, and has little effect on the biofilm thickness and functional microbial activity of the filter media, and has a greater inhibitory effect on the nitrifying bacteria. In practical engineering applications, the CANON process can be stably operated through regular backwashing.