A Study of Treatment of Low-Turbidity, Low-Temperature Water by Enhanced Coagulation

In view of the difficulties caused by the low-temperature, low-turbidity water source in Han River in winter to the water treatment in water plants, the results of treatment of low-temperature, low-turbidity water with three different coagulant aids, i.e., polymerized dially dimethyl ammonium chloride(HCA), active silicic acid and Polyacrylamide(PAM)were studied. The results showed that when basicity improver was added in first to adjust the pH value and then HCA and polymerized aluminum chloride(PAC)were used in combination, the results of coagulation were greatly improved, and that, compared to other coagulant aids, the said agents are easy to dose and do not cause additional cost for civil works to the water plants and, therefore, can be widely used in water plants for the treatment of low-temperature, low-turbidity water.