Electrochemical Treatment of Reverse Osmosis Concentrate of Oil Refining Wastewater by Mn-Sn-Ce/gamma-Al2O3 Particle Electrode

The reverse osmosis concentrate of oil refining wastewater was studied with a three-dimensional electrode reactor (TDER). The particle electrode was Mn-Sn-Ce modified γ-Al₂O₃ as and anode was DSA^® type anode. Higher chemical oxygen demand (COD) and phenolic compounds removal was achieved in TDER with Mn-Sn-Ce/γ-Al₂O₃ comparing with γ-Al₂O₃, and particle electrode of Mn-Sn-Ce/γ-Al₂O₃ was beneficial to the improvement of COD and phenolic compounds removal efficiency. Under the optimum condition [Mn-Sn-Ce/γ-Al₂O₃ 100g/500mL, current density=30(mA/cm²), pH=6.5 and treatment time=60(min)], the phenolic and COD compounds removal efficiencies of wastewater were 98.48% and 95.50%. X-ray photoelectron spectroscopy, XRD powder diffraction, Brunauer-Emmett-Teller test and Scanning electron microscope were performed to characterize Mn-Sn-Ce/γ-Al₂O₃.