钻井污水是石油、天然气开采过程中产生的成分复杂、COD_Cr高、色度大的废水,其达标排放是环境保护中较难解决的问题。实验研究发现,采用PAC絮凝剂絮凝和Fenton试剂化学氧化两步方法可使钻井污水达到排放标准。介绍了实验过程,通过正交实验方法给出了最佳操作条件,分析了絮凝和化学氧化的各个因素对结果的影响。实验结果表明,采用“絮凝和化学氧化”两步方法可使钻井污水的色度和COD_Cr同时达标,COD_Cr去除率达95%。

Well drilling sewage from the exploitation of petroleum or natural gas, which is characterized by complicated composition, high COD_Cr and high chroma, is difficult to be treated to meet the environmental protection standard. Experimental study results show that a combination of PAC flocculation and Fenton chemical oxidation method could be competent to treat the sewage satisfactorily. The optimum recipe for the treatment is decided by orthogonal experiments, and the effects of important factors of PAC flocculation and Fenton chemical oxidation on the COD_Cr of sewage have been investigated systematically. Experimental results show that the chroma and COD_Cr of sewage treated by flocculation and chemical oxidation method met the sewage drainage standard and the removal rate of COD_Cr is 95%.