铁碳微电解-Fenton氧化处理海上废弃钻井液液相实验

为处理海上油田废弃钻井液,以我国海上油田广泛使用的有机正电胶钻井液为例,研究采用铁碳微电解-Fenton氧化处理工艺可行性.结果表明,废弃有机正电胶钻井液及其固液分离后的废水COD超过废水排放标准.优化铁碳微电解-Fenton氧化的适宜条件:微电解时间不低于3h;双氧水质量分数为0.5%,氧化时间为2h.铁碳微电解-Fenton氧化处理工艺对废弃钻井液废液COD有较明显的处理效果,但一轮次处理无法达到排放标准.铁碳微电解-Fenton氧化—次氯酸钠深度氧化以及多轮次铁碳微电解-Fenton氧化处理可以使固液分离后的废弃钻井液达到工业污水排放二级标准.

The disposal of wastewater of drilling fluid by process integration of Fe-C microeletrolysis-fenton oxidation for offshore oilfield

To protect ecological environment of Bohai gulf,waste drilling fluid must be disposed in off-shore oilfield.Fe/C microelectrolysis-Fenton oxidation method was investigated for the wastewater of organic positive gel drilling,which was applied widely in Bohai bay oilfield.The influence of reaction time to microelectrolysis,the dosage of H2O2 and reaction time to Fenton reaction are investigated.The optimal conditions of the treatment were determined as follows:reaction time 3h for microe1ectrolysis method,while the dosage of hydrogen peroxide 0.5%,and reaction time 120min for the Fenton meth-od.Because of high COD value of wastewater,treatment by Fe/C Microeletrolysis-Fenton oxidation cannot meet the requirement of discharge standard.Process integration of Fe/C Microeletrolysis-Fenton oxidation-sodium hypochlorite can decrease the COD value of wastewater significantly.After process of Fe/C Microeletrolysis-Fenton oxidation-sodium hypochlorite,multi-time treatment can meet secondary discharge standard by process integration of Fe/C Microeletrolysis-Fenton oxidation.