混凝/催化氧化/微电解三元组合技术处理油田压裂废液

摘要

The composition of hydrofracturing waste fluid is complicated ,with high viscosity and chemical oxygen demand (COD) and so it is hard to be degraded by biochemical treatment ,causeing serious pollution to the environments .A new method of treating hydrofracturing waste fluid is put forward ,which is the combination of the coagulation ,catalytic oxidation and iron chipping micro -electrolysis and the optimal conditions of each reactions are given .The results show that after the treatment of the combined process ,viscosity could be reduced to 1 .5 mPa・s ,the removal rate of COD is more than 98% , COD could be reduced to less than 150 mg/L and the treated wastewater can meet the requirements of the national second -level discharge standard .The analysis result shows that lixivium from solidified sludge cake of per unit operation complies with the requirements of “Standard for Pollution Control on the Storage and Disposal Site for General Industrial Solid Wastes” .%油田压裂废液成分复杂、粘度高、COD高且难降解，对环境造成较大污染。提出了化学混凝／催化氧化／微电解三元组合技术处理压裂废液的新方法，确定了各步骤的最佳工艺条件。结果表明，压裂废液经化学混凝／催化氧化／微电解三元组合技术处理后，粘度降至1．5 mPa・s ，COD去除率＞98％，COD＜150 mg／L ，达到国家污水排放2级标准。各单元过程形成的泥饼浸出液分析结果符合GB 18599—2001《一般工业固体废物贮存、处置场污染控制标准》第一类技术要求。