Abstract:

Electrocoagulation-MBR technology has been carried out to deeply treat petrochemical wastewater. The results show that the best running conditions are as flows：adopting iron-carbon electrode，the current density is 45mA/cm²， water velocity between plates is 6 mm/s，energy consumption is 1.17 kW·h/t， hydraulic retention time（HRT） of MBR is 6 h， dissolved oxygen （DO） is 2.0-2.5 mg/L. Under these conditions，the removing rates of both COD_Cr and oils exceed 70%，the removing rates of both BOD and ammonia-nitrogen exceed 80%. The quality of effluent water achieves that of water recycle.

Key words: electrocoagulation, membrane bioreactor, petrochemical wastewater, advanced treatment, regenerated water recycle

摘要：

采用电絮凝-MBR组合工艺深度处理石化工业废水，结果表明该组合工艺的最佳运行条件为：电絮凝工艺采用铁-碳电极，电流密度为45 mA/cm²，极板间的水流速度6 mm/s，此时废水处理能耗为1.17 kW.h/t；MBR工艺水力停留时间(HRT)为6 h，溶解氧(DO)控制在2.0～2.5 mg/L。在上述最佳条件下COD_Cr、石油类的去除率均在70%以上，BOD和氨氮的去除率均在80%以上，出水水质达到了中水回用水质标准。

关键词: 电絮凝, MBR, 石化废水, 深度处理, 中水回用

CLC Number: 

• X703.1