臭氧+生化联合处理外排稠油污水试验

Experimental Study on the Combined Treatment of the Heavy Oil Produced Water by Ozone and Biochemical Process

以国内某油田稠油产出水经隔油-气浮工艺处理后的出水为处理对象,考察了臭氧投加量、停留时间、药剂投加量对超稠油污水COD去除率的影响。结果表明,当预氧化进水COD平均值为497.8 mg/L,臭氧投加浓度(按臭氧发生器功率-空气量-臭氧量图计算)为100 mg/L,停留时间为3 h,絮凝剂PFS和PAM投加浓度分别为75 mg/L和30 mg/L,水解酸化/接触氧化工艺停留时间为60 h,臭氧催化氧化后PFS与PAM的投加浓度分别为100 mg/L和30 mg/L,臭氧投加浓度为120 mg/L时,最终出水COD均值为40.2 mg/L,满足辽宁省《污水综合排放标准(DB21/1627—2008)》中的一级标准要求。

Taking the heavy oil produced water that has treated by oil separation and gas flotation in some oilfield in China as the processing object, the influence of the ozone dosage, retention time and coagulant dosage on the removal rate of the COD of the super heavy oil is studied. The result shows that the final effluent COD can be reduced to 40.2 mg/L averagely when the pre-oxidization influent COD is 497.8 mg/L averagely, the ozone concentration （calculated according to diagram of ozone generator power-air concentration-ozone concentration） is 100 mg/L, the retention time is 3 h, the concentration of two coagulants （PFS and PAM） is 75 ml/L and 30 mg/L respectively, the retention time of hydrolytic acidification/contact oxidation process is 60 h, the concentration of two coagulants （PFS and PAM） after ozone catalytic oxidation is 100 mg/L and 30 mg/L respectively, the ozone concentration is 120 mg/L, which can satisfy the primary standard required by sewage discharge standard （DB21/1627-2008） of Liaoning Province.