Treatment of low temperature and low turbidity water by coagulation-ultrafiltration process

The water treatment of Songhua River in the period of low temperature and low turbidity water was investigated by coagulation-UF process in pilot equipment,and the water quality treated by the process was compared with the traditional disposal water.The experimental results showed that in coagulation-UF process,the turbidity of outlet effluent was below 0.3 NTU;the removal rate of CODMn was 50%～58% and the outlet effluent color was 6～8 by using coagulant concentration of 20 mg/L polyaluminium chloride.Furthermore,membrane permeability was improved with the addition of coagulant.Therefore,coagulation-UF process is an effective technique for treating low temperature water with low turbidity.