To ensure the security of urban drinking water

a study was conducted by taking the water source of Mopanshan Reservoir as the research sample

which has low temperature

low turbidity

high chroma

and is rich in natural organic matter. In the study

different disinfectant methods such as liquid chlorine

sodium hypochlorite

and chloramine disinfection were carried out in conventional water treatment process. The study indicated that the disinfection of liquid chlorine and sodium hypochlorite resulted in the formation of trichloroacetaldehyde. However

for the chloramine disinfection method

when the weight ratio of sodium hypochlorite and ammonium sulfate reached 4∶1 (2 mg/L∶0.46 mg/L)

the by-product of disinfection especially trichloroacetaldehyde decreased significantly. Moreover

the disinfection lasted longer

which provided more stable disinfection effect for pipe-network water. Chloramine disinfection method was superior to conventional liquid chlorine and sodium hypochlorite disinfection in the decrease of by-products produced in drinking water disinfection

and its indexes met the requirements of Drinking Water Health Standards (GB5749-2006)

which solved the problem of overmuch trichloroacetaldehyde in pipe-network water.