Coagulation/Ultrafiltration Process for Treatment of Da Huofang Reservoir Water in Low Temperature and Low Turbidity Period

The treatment efficiency of Da Huofang Reservoir water in low temperature and low turbidity period by Coagulation/Ultrafiltration process was investigated in pilot study, and the water quality treated by the process was compared with that by the traditional treatment process. When coagulant dosage is 30 mg/L, the average removal rates of turbidity, CODMn and UV254 were 89.2%, 47.3% and 52.8% respectively in the coagulation/ultrafiltration process, and the treatment efficiency was obviously superior to the traditional process. In the study of operation parameters optimization for Coagulation/Ultrafiltration process, the optimum membrane flux was determined that was 50 L/m2h. The cleaning membrane water was treated by coagulation sedimentation process, and the quality of effluent was good which was mixed with raw water for reuse, and the experiment indicated that this method did not affect the stable operation of Coagulation/Ultrafiltration process, eventually the water recycling rate was improved from 89% to 96.5%.