一体化MBR组合工艺(CWT)处理工业园区混合污水

Application of Integrated MBR Combined Process in Industrial Wastewater Treatment

工业园区混合污水水质复杂,含有一定量的难降解有机物或有毒有害物质,采用常规工艺处理很难达到较高的排放标准。采用强化预处理+一体化MBR(CWT)+高级氧化组合工艺处理某工业园区综合排放污水,出水水质可稳定达到北京市《城镇污水处理厂污染物排放标准》(DB 11/890—2012)的B标准。运行结果表明,预处理阶段采用多核絮凝药剂,投加量为100~200mg/L,可去除20%的COD;CWT强化生化降解,COD去除率可达到60%~80%,出水COD可稳定在30~40 mg/L;高级氧化采用臭氧催化氧化技术,COD去除率可达30%~50%,出水COD稳定低于30 mg/L。高级氧化单元的综合成本约为0.04~0.05元/mg COD。

The quality of mixed sewage produced in industrial parks is complex and contains a cer- tain amount of refractory organics or toxic and hazardous substances, which is difficult to meet higher dis- charge standards with conventional treatment process. A combined process of enhanced pretreatment, CWT （Compact Wastewater Treatment System） and advanced oxidation process was applied to deal with integrated sewage in an industrial park. It was showed that effluent quality could meet level B criteria in Beijing local Discharge Standard of Water Pollutants for Municipal Wastewater Treatment Plant （ DB 11/ 890- 2012）. It was indicated that 20% of COD could be removed by adding polynuclear flocculants （100 -200 mg/L） in the pretreatment stage. After CWT enhanced biochemical degradation process, the removal rate of COD could reach 60% - 80%, and the concentration of effluent COD could be stabilized at 30- 40 mg/L. Ozone catalytic oxidation technology was used for advanced oxidation reaction, after which COD could be further removed by 30% -50% and the concentration of effluent COD was stably below 30 mg/L. The combined costof the advanced oxidation unit is about 0.04 -0.05 CNY/mgCOD.