混凝和微滤膜组合工艺处理稠油污水的研究

Study on heavy oil produced water treatment by coagulation-microfiltration combination

以辽河油田某稠油污水处理厂外排水为对象，采用混凝与微滤膜（MF）处理相结合的方法，从操作压差、膜孔径、混凝处理等多个角度对稠油污水膜分离及组合工艺进行条件优化和效果分析．确定选择0．5μm孔径膜、O．25MPa操作压差为膜最佳操作运行条件；通过常规的混凝和膜分离联合处理方法可有效去除稠油废水中悬浮性及部分可溶性有机污染物，处理后出水COD平均浓度86～97mg／L，去除率达到43．4％；且膜清洗通量能够恢复96．8％．结果表明该工艺远优于传统工艺，可以作为稠油污水二级处理保障工艺．

A series of experiments were carried out for heavy oil produced water treatment in coagulation- microfiltration system. It could resolve the problem that produced water missing emission control regulations. This paper studied some factors for heavy oil produced water microfiltration treatment such as transmembrane pressure, pore diameter, and coagulation effect. The optimal operation condition was 0.5 μm pore diameter and the most favorable pressure was 0.25 MPa for microfiltration. The results showed that it is feasible to separate the pollutants from heavy oil produced water by combined method. At the optimal conditions,the COD content in the filtrate was 86~97 mg/L. The COD removal ratio can reach above 43.4%. The suspended and dissolved organic substances could be separated by different molecular weigh. The recovery of membrane flux can reach up to 96.8%. The combined method can arrive at the emission control regulations.