Abstract
The influences of coagulant species, dose, water turbidity, and pollution situation of raw water on the results of enhanced coagulation have been investigated targeted at water contaminated by chemical agent. Ferric trichloride and polymeric aluminum ferric chloride (PAFC) acted as coagulant, poly dimethyl diallyl ammonium chloride (HCA) worked as coagulant aid and paraoxon acted as simulation agent of chemical agent VX in this process. The results show that: enhanced coagulation process cannot remove effectively chemical agent (paraoxon) in raw water; the result of treatment by PAFC and PAFC+HCA is better than that by FeCl3 and FeCl3+HCA; the addition of certain amount of HCA based on the condition that coagulant has been added will improve removal rate of both chemical agent and turbidity; the bigger the turbidity of raw water is, the higher the removal rate of paraoxon will be.
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