BNR生物强化脱氮+MBR工艺升级改造污水厂

Retrofit of a WWTP by Biological Nutrient Removal and Membrane Bioreactor Process

某污水厂的生物池由原25 × 10^4 m^3/d的T型氧化沟工艺升级为40 × 10^4 m^3/d的BNR生物强化脱氮工艺。泥水分离选用MBR工艺。为保障旱季、雨季、冬季、夏季及高浓度有机废水冲击等复杂工况下的实时处理效果,配套建设了 Smart BNR控制系统。全线运行后,出水COD≤16 mg/L、BOD5 ≤2mg/L、NH3 -N≤0.36 mg/L、TN≤14.8 mg/L,满足《地表水环境质量标准》(GB 3838- 2002) IV类标准(TN除外)。整个膜车间的工艺设备系统总投资约2亿元,平均电耗约0. 19 kW·h/m^3.目前该项目已顺利通过环境保护竣工验收。

An aeration tank of a WWTP was retrofitted from the original T-shape oxidation ditch with capacity of 250 000 m^3/d to BNR process with capacity of 400 000 m^3/d. MBR process was applied for its sludge and effluent separation. To guarantee the real time effluent performance for difference seasons of dry, storm, winter, summer and the high organic wastewater load, etc., Smart BNR control system was applied. After full operation, the effluent COD, BOD5, NH3 - N, and TN were no more than 16 mg/L, 2 mg/L, 0. 36 mg/L, and 14. 8 mg/L respectively, which stably met level IV criteria ( except total nitrogen ) of Environmental Quality Standard for Surface Water ( GB 3838 - 2002 ). The whole equipment investment in the membrane workshop was about 200 million yuan, and the average electricity cost was 0. 19 kW · h/m^3. Now it has passed the completion acceptance of environmental protection.