混凝-臭氧氧化法处理三磺泥浆体系钻井废水

三磺泥浆体系钻井废水经混凝处理后的出水化学需氧量(Chemical Oxygen Demand, COD)值稳定在350~600 mg/L，水中残留的COD物质可絮凝性很差. 对水中残留COD物质的主要来源进行了初步的分析. 采用混凝-臭氧氧化法处理三磺泥浆体系钻井废水，在6000 mg/L石灰和2000 mg/L硫酸亚铁(FeSO4)的混凝作用下，COD的脱除率为77.2%；对混凝出水采用臭氧氧化法处理，随初始pH值的升高，臭氧氧化效果增强，随COD值降低，臭氧指数(Ozone Index, OI)显著增大；在pH值为12.5下氧化5 min, COD的氧化去除率达81.2%；混凝-臭氧氧化法两步反应的COD总去除率为95.7%，出水无色，COD<100 mg/L，达到了排放标准.

Treatment of Drilling Wastewater Correlated with Three-sulfonated Mud System by Coagulation-Ozone Oxidation Process

The chemical oxygen demand (COD) value of effluent of drilling wastewater correlated with three-sulfonated mud system after coagulation was about 350~600 mg/L, and the residual organic substance in effluent after coagulation was discussed. The COD removal rate on coagulation was 77.2% with 6000 mg/L lime and 2000 mg/L ferrous sulfate and 81.2% by ozone oxidation at pH 12.5 and 5 min. The COD removal rate increased with the increase of pH, and ozone index (OI) increased with the decrease of COD value. The total COD removal rate after coagulation and ozone oxidation was 95.7%. The effluent purified was colorless and its COD value was less than 100 mg/L, which reaches the wastewater discharge standard.