Research on coagulation and sedimentation -SBR on treating preserved fruit wastewater

By adjusting the pH of wastewater, the preserved fruit wastewater was treated by applied Coagulation and sedimentation-SBR composite process. The results of the experiments have shown that the treating effect was superior when the pH was 5. COD removal rate was 7.52%, turbidity removal rate was 25.59%, and decolorization rate was 15.46%; The treating effect was superior on using 200 mg/L of PAC when the preserved fruit wastewater was treated by PAC. COD removal rate was 23.56%, turbidity removal rate was 86.64%, and decolorization rate was 71.58%. Chromaticity declined from 400 Pt-Co to 50 Pt-Co; In the course of composite process, SBR was used as secondary treatment after the primary treatment. The effect on turbidity removal rate, decolorization rate and Chromaticity were very little, but COD removal rate had reached at 45.18%.