油田钻井废水的物化组合处理技术

对化学混凝-膜分离、化学混凝-活性碳吸附组合工艺处理油田钻井废水进行了试验研究。通过对4种混凝剂混凝对比试验，确定最佳混凝剂为聚合氯化铁(PFC)。在pH=8.1，助凝剂聚丙烯酰胺(PAM，质量分数0.5%)投加量w(PAM)为10mL·L^-1，PFC(质量分数10%)投加量w(KC-87)为10mL·L^-1的条件下，化学需氧量（COD）去除率达95.3%。混凝出水经膜分离深度处理后，没有达到排放要求。混凝出水经活性炭深度处理获得了较好的效果。在选取的4种活性炭中，KC-87粉末状果壳活性炭的吸附效果最好，在吸附时间为1h、投加量w(KC-87)为3g·L^-1的条件下，可使混凝出水中COD的去除率达75.3%。经PFC化学混凝和KC-87活性炭吸附组合工艺处理后，废水COD总去除率达到97.4%，其他污染物也得到了明显的去除，使得最终出水达到了国家废水综合排放标准一级水平。

Treatment of drilling wastewater from oil field by coagulation combining with membrane separation and activated carbon adsorption

The drilling wastewater from oil field was treated through chemical coagulation combining with membrane separation and activated carbon adsorption. Four kinds of coagulants, one membrane and four types of activated carbons were investigated. Poly ferric chloride (PFC) was found to be the best one among the four coagulants, and the COD removal efficiency was 95.3% when PFC of 100mL·L^-1and PAM of 10mL·L^-1were added without pH adjustment. The wastewater pretreated by PFC was further treated by a membrane and activated carbons, respectively. It was found that the activated carbon as the second treatment process achieved an expected result, while the membrane separation did not. The activated carbon powder KC-87 reached maximum COD removal efficiency of 75.3% when KC-87 of 3g was added to 1L wastewater after 1h adsorption. With the combined treatment by PFC coagulation and KC0-87 adsorption at the optimal conditions, the total COD removal efficiency reached 97.4%, and the treated wastewater reached the first class level of the Integrated Wastewater Discharge Standard.