| Abstract:The paper investigated the effect of electrocoagulation, chemical coagulation and the combined process on the removal of CODCr and color from the diluted cotton pulping black liquor. The results showed that when initial pH was 9.0, current density was 150 A/m2 and treatment time was 90 min, the removal rates of CODCr and color were 64.0% and 88.6% respectively by electrocoagulation method. Both initial wastewater consistency and NaCl consistency had little effect on the removal efficiency. When initial pH was 6, PAC dosage was 500 mg/L and PAM dosage was 3 mg/L, the removal rates of CODCr and color were 39.3% and 78.2% respectively by chemical coagulation method. When initial pH was 9.0, PAC dosage was 200 mg/L, current density was 100 A/m2 and treatment time was 60 min, the removal rates of CODCr and color were 64.4% and 91.3% respectively by the combined method. |
