摘要
呼和浩特市某污水处理厂设计规模为5×10^4m^3/d,原采用CASTX艺,出水主要指标均劣于《城镇污水处理厂污染物排放标准》(GB18918-2002)一级B标准,为使出水水质达到一级A标准,提标改造工程采用了MBBR+活性砂滤池工艺。提标改造工程完成至今已运行2年多,在进水水质远超设计值的情况下,其处理出水水质依然能够达到一级A标准,具有较好的处理效果。改造后,平均出水COD、BOD5、氨氮、TN、TP分别为23.5、4.5、1.58、12.3、0.28mg/L;系统在实际进水各主要指标的最大冲击负荷超过设计值200%,以及呼市冬季平均水温在8~12℃时,亦具有良好的处理效果,表明系统具有较好的耐冲击及耐低温性能;平均总氮去除率超过80%,回流比不超过300%,好氧区填料上反硝化菌群丰度为11.44%,揭示好氧过程中可能存在着同步硝化反硝化现象;系统内主要的硝化菌群、反硝化菌群数量高于改造前,且填料上硝化菌群丰度达到14.6%,高于活性污泥中的6.98%,优势菌属分别为Nitrosomonas和Nitrospira;同时检出系统中有ANAMMOX菌存在。
A WWTP in Hohhot City had design treatment capacity of 5×10^4 m^3/d, with CAST as the biological process. The main indexes of the effluent were inferior to the class B grade I standard of the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant ( GB 18918-2002 ). MBBR and active sand filter technology was adopted to improve the effluent quality level to the class A grade I . WWTP had been retrofitted for more than two years. In the case that the influent water quality was far worse than the design value, the effluent water quality could still achieve the design expectation , e. g. the class A , and the system had a good treatment effect. After the retrofitting, the average effluent COD, BOD5, ammonia nitrogen, TN, TP were 23. 5 mg/L, 4. 5 mg/L, 1.58 mg/L, 12. 3 mg/L, 0. 28 mg/L, respectively, which could meet class A grade I standard. Although the maximum impact load of the main indexes exceeded the design value by 200% and the average water temperature was 8-12 ℃,the process also had good treatment effect and good resistance to impact and low temperature. The average TN removal of the process was over 80%, and the reflux ratio was less than 300%. The abundance of denitrifying bacteria in the aerobic zone was 11. 44%, which indicated that the simultaneous nitrification and denitrification occurred in the aerobic process. The number of main nitrifying bacteria and denitrifying bacteria in the system was higher than that before retrofitting. The abundance of nitrifying bacteria on the suspended carrier reached 14. 6%, which was higher than 6. 98% in activated sludge. The dominant nitrifying bacteria was Nitrosomonas and Nitrospira;there were also ANAMMOX bacteria in the process.
作者
高伟楠
周川
纪海霞
程树辉
王洪刚
吴迪
GAO Wei-nan;ZHOU Chuan;JI Hai-xia;CHENG Shu-hui;WANG Hong-gang;WU Di(Beijing General Municipal Engineering Design & Research Institute Co. Ltd., Beijing 100082 , China;Qingdao Spring Water Treatment Co. Ltd., Qingdao 266555 , China)
出处
《中国给水排水》
CAS
CSCD
北大核心
2019年第10期53-59,共7页
China Water & Wastewater
