Treatment of Dye Wastewater by Flocculation and Sedimentation-Micro-electrolysis-Fenton Oxidation Process

Abstract

This paper adopts the flocculation and sedimentation-micro-electrolysis-Fenton oxidation process to treat dye wastewater. The optimized treatment conditions are as follows: in the flocculation and sedimentation stage, the PAC and PAM dosages should both be 1ml/L, in the micro-electrolysis stage, the influent should be of pH3.5, and the hydraulic retention time should be 6h, and in the Fenton reaction, the dosage of H₂O₂ should be 0.6ml/L. The results of operation for 15 consecutive days under the optimal conditions show that the combined process can reduce the COD in the raw water from over 1500mg/L to below 1000mg/L, and that the system can obviously increase the biodegradability (BOD₅/COD) of the raw water.