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以重庆某页岩气井钻井废水经混凝处理后的出水为研究对象,采用臭氧法对钻井废水进行深度氧化处理。结果表明,溶液初始pH对钻井废水的臭氧氧化过程具有很大影响,与酸性环境相比,碱性环境更能促进O_3分解产生更多具有强氧化能力的羟基自由基;COD去除率随着臭氧投加量和反应时间的增加而逐渐增大,水中大量存在的Cl~-、SO_4~(2-)、Ca~(2+)和Mg~(2+)等无机离子对钻井废水的COD去除率影响不大。在pH=11.2、臭氧投加量8 mg/min和反应时间60 min的优化工艺条件下,COD和TOC的去除率分别为48.35%和50.28%。
Taking the effluent from the drilling wastewater of a shale gas well in Chongqing after coagulation treatment as the research object, the drilling wastewater was deeply oxidized by the ozone method. The results showed that the initial pH of the solution had a great influence on the ozone oxidation process of drilling wastewater. Compared with the acidic environment, the alkaline environment could promote the decomposition of O_3 to produce more hydroxyl radicals with strong oxidizing ability. The removal rate of COD decreased with the increase of ozone Dosage and reaction time, the removal of COD from drilling wastewater by inorganic ions such as Cl ~ -, SO_4 ~ (2 -), Ca ~ (2+) and Mg ~ (2+) Rate is not affected. Under the optimal conditions of pH = 11.2, ozone dosage 8 mg / min and reaction time 60 min, the removal rates of COD and TOC were 48.35% and 50.28%, respectively.