氧化絮凝-三维电极法处理页岩气返排液

Treatment of shale gas fracturing fluid by oxidation flocculation-three-dimension electrode method

采用以二氧化钛为粒子电极,铝板为阳极,钛板为阴极形成的三维电化学体系对经氧化絮凝预处理的页岩气返排液进行深度处理。通过单因素实验得到最佳频率、占空比及二氧化钛投加量。依据响应面分析结果预测的最佳工艺条件:pH=7.33,电流为58.01 m A,处理时间为39.44 min。在最佳工艺条件下,模型预测COD去除率为92.3%,与实际值误差为1.4%。采用氧化絮凝-三维电极法处理页岩气返排液,出水可达到排放标准要求。

The shale gas fracturing liquid which experienced oxidation flocculation pre-treatment has been treated indepth by a three-dimension electrochemical system formed with titanium dioxide as particle electrode,aluminumplate as anode and titanium plate as cathode.By means of single-factor experiments,the optimum frequency,dutyratio and titanium dioxide dosage are obtained.The best process conditions predicted according to the responsesurface analysis results are as follows：pH=7.33,I=58.01 mA,and treatment time 39.44 min.Under the optimumconditions,the predicted COD removing rate of the model is 92.3%.The error compared with the actual value is1.4%.By oxidation flocculation-three-dimension electrode method,the effluent can meet the requirements for thedischarge standard.