The natural organic matter(NOM) in water may produce carcinogens in the chlorination process. It is necessary to find a highly efficient method of NOM removal. In this paper

the effects of hydraulic conditions

pH value and Al

2

(SO

4

)

3

dosage on coagulation are studied with the enhanced coagulation technology. The results show that the enhanced coagulation technology can remove NOM efficiently

while controlling the residual Aluminum within the standard. The TOC decreases quickly with increasing  Al

2

(SO

4

)

3

dosage

but the removal rate remains stable when dosage is over 0.2 mmol/L. The residual Aluminum decreases with the rising of pH value until 8.0

and then increases. The TOC of residual organic matters is controlled at about 1.4 mg/L and residual aluminum is kept below 0.05 mg/L in water with pH value of 8.0 and  Al

2

(SO

4

)

3

dosage of 0.3 mmol/L.