微电解技术处理钻井污水的试验研究

采用铁屑/活性炭微电解法,对化学混凝处理后的钻井污水进行试验研究,得出最佳工艺条件:起始pH为1.0、铁/炭质量比为10、反应时间3h,宜选择活性炭、铸铁作为微电解法的材料。多因素正交试验表明:对CODCr去除能力的影响顺序为:起始pH>液固比>铁/炭质量比,对两种有代表性的活性炭分别确定了最佳工艺条件。在四川普光气田普光A-2井现场试验表明,化学混凝——铁屑/活性炭微电解处理钻井污水,能够达到《污水综合排放标准》(GB8978—1996)一级标准要求。

Experimental Research on the Petroleum Drilling Wastewater Treatment by Microelectrolysis Techniques

The iron scrap/active carbon microelectrolysis techniques was adopted, and the drilling wastewater after chemical coagulation treated was used in the experiment. The best technique conditions were: iron carbon mass ratio was 10, reaction time was 3h and the initial pH was 1.0, and active carbon and cast iron were the suitable materials. The results of multiple factors orthogonal design indicated that: the sequence influencing CODCr removal rate was initial pH>fluid/solid ratio> iron /carbon ratio. Two kinds of active carbon were used to determine the best technique conditions. Field experiments in Puguang A-2 drilling sites,Sichuan Puguang Gas Field showed that, chemical coagulation-iron scrap/active carbon microelectrolysis technique was suitable for drilling wastewater treatment, and the treated water could meet Grade I of Integrated wastewater discharge standard (GB 8978-1996)