Study on the Degradation of Oilfield Wastewater Treatment by Three-Dimensional Electrode

The COD value is the main control index of sewage standard. The method of three-dimensional electrocatalytic oxidation is studied for deep treatment of oilfield sewage. The oxidation mechanism and the structure of the three-dimensional electrode reactor are analyzed and optimized. A series of single factor experimental results show that each control parameter has different influences on COD removal rate in the process of oxidative degradation. Based on the experimental study of electrode materials, electrode filled particles, electrolysis current and resident time of sewage, when the system condition are DSA electrode-F plate, the electrode particles of activated carbons:glass beads:quartz sands = 5:2:2, the electrolysis current of 6 A and the retention time of 50 min, the sewage by oxidized treatment meets the discharge standard of COD ≤ 50 mg·L-1. The SEM result analysis of DSA electrode-F plate before and after using for a period of time shows the electrode material is stable, and no dissolution and corrosion occur. The UV-Vis absorption spectroscopy analysis of water samples in the wavelength range of 200 - 600 nm shows pollutants in sewage are degraded into small molecules, and refractory organic pollutants are effectively removed.