反硝化生物滤池处理乡镇污水厂尾水的脱氮效能研究  

Study on the Nitrogen Removal Efficacy of Denitrification Biofilter in the Treatment of Tailwater from Township Sewage Plant

作　　者：袁绍春[1,2] 王钦 吕波[2,4] 文浩舟 YUAN Shaochun;WANG Qin;LV Bo;WEN Haozhou(Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education,Chongqing Jiaotong University,400074;Chongqing Municipal Research Institute of Design,401120;Chongqing Engineering Laboratory of Environmental Hydraulic Engineering,Chongqing Jiaotong University,400074;Chongqing Academy of Science and Technology,401123:Chongqing,China)

机构地区：[1]重庆交通大学水利水运工程教育部重点实验室,400074 [2]重庆市市政设计研究院有限公司,401120 [3]重庆交通大学环境水利工程重庆市工程实验室,400074 [4]重庆市科学技术研究院,401123:重庆

出　　处：《水处理技术》2024年第11期107-112,共6页Technology of Water Treatment

基　　金：重庆市自然科学基金资助项目(No.cstc2020jcyj-msxmX1000)。

摘　　要：针对乡镇污水厂尾水碳源不足的特点,通过模型试验研究了HRT、碳氮比(C/N)、碳源种类对反硝化生物滤池(DNBF)深度脱氮效果的影响。结果表明,在HRT为60~80 min,C/N为4.5~5.5,以玉米芯浸泡液作为碳源时,DNBF具有良好的脱氮效果,出水水质稳定且能满足《四川省岷江、沱江流域水污染物排放标准》DB 51/2311-2016的排放限值。DNBF处理效能与原水C/N和工艺HRT显著相关,当HRT降至40 min以下时,出水COD明显升高;当C/N降至4.5以下时,填料层内出现不同程度的NO_(2)^(-)-N积累问题。DNBF最佳运行参数为HRT=60 min、C/N=5.5、以玉米芯浸泡液为碳源,此条件下其出水TN、NO_(3)^(-)-N、NH_(4)^(+)-N、COD、TP平均浓度分别为7.77、3.98、1.13、24.23、0.27 mg/L,对应的平均去除率分别为67.18%、68.46%、47.95%、74.04%、38.99%,脱氮效果以及对其它污染物的去除效果良好。In view of the characteristics of insufficient carbon sources in the tailwater of township sewage plants,the effects of HRT,carbon-nitrogen ratio(C/N)and carbon source types on the advanced nitrogen removal efficiency of denitrification biofilter(DNBF)were studied through model tests.The results showed that the DNBF had a good nitrogen removal effect and stable effluent quality under the HRT of 60~80 min,the C/N ratio of 4.5~5.5 and corncob soak solution as a carbon source,which could meet the Discharge Standard of Water Pollutants for Minjiang River and Tuojiang River Basins in Sichuan Province(DB 51/2311-2016).The DNBF treatment efficiency is significantly related to raw water C/N and process HRT.When HRT drops below 40 min,the effluent COD increases obviously;when C/N drops below 4.5,different degrees of NO_(2)^(-)-N accumulation problems occur in the packing layer.The optimum operation parameters of DNBF were HRT=60 min,C/N=5.5 and corncob soaking solution as a carbon source.Under this condition,the average concentrations of TN,NO_(3)^(-)-N,ammonia nitrogen,COD and TP in the effluent were 7.77,3.98,1.13,24.23,0.27 mg/L respectively.The corresponding average removal rates were 67.18%,68.46%,47.95%,74.04%and 38.99%respectively.The nitrogen removal effect and the removal of other pollutants are good.

关 键 词：反硝化生物滤池 碳源 碳氮比 水力停留时间 脱氮 

分 类 号：X703[环境科学与工程—环境工程]