As a complementary measures, the enhanced coagulation process was used for the treatment of domestic sewage at low temperature, The resuits showed that the treating effect of single coagulant PAC was better than that of other single coagulants when temperature was lower than 12℃; dosing coagulant aid PAM could raise turbidity removal rate at a smaller range; in consideration of practical application, dosing single coagulant PAC could bc determined to be the optimal dosing way; under the condition of the optimal coagulation, the average removal...