Study On The Treatment Technology Of Shale Gas Fracturing Flowback Water In Two-electrode Electro-peroxone Process

Fracturing flowback water is a kind of industrial wastewater generated during shale gas exploration and difficult to handle.The degradation of colloid and organic matter is the key to its reuse and discharge.According to the water quality and characteristics of fracturing flowback water,the study developed a new treatment technology combined electro-peroxone with electrocoagulation for fracturing flowback water.The feasibility and dynamic mechanism of the two processes for the fracturing fluids treatment were discussed.Compared with ozone oxidation,electroflocculation,electroflocculation-electrocatalytic oxidation and electrocoagulation-electrocatalytic ozone oxidation treatment technology can achieve a COD removal rate of 82.4%for 90 min,and the COD removal effect is significantly better than other techniques at current density of 50m A/cm²..Compared with the three wastewater treatment technologies,the medium-weight average molecular weight?1920Da?is almost completely removed after treatment.The reaction kinetic constant k and current utilization efficiency increase significantly.In this process,Electro-peroxone have a good synergistic effect.Compared with the electroflocculation and electrocatalytic ozone treatment processes,the Electro-peroxone combined with electrocoagulation requires about 1/2 of the electricity to achieve the same COD removal.Compared with double-electrode and single-electrode treatment of electrolysis of chlorine and H₂O₂,the results show that the degradation rate of phenol by double-electrode electrolysis of chlorine and H₂O₂oxidation process was k=0.42,which was twice the rate of one-electrode treatment.Compared with single-electrode oxidation,double-electrode treatment of electrolysis of chlorine and H₂O₂ has the highest COD degradation efficiency.The degradation rate of COD at 24 m A for 24 h is 29%.