Inactivation of Zooplankton and Influence on water quality security of Disinfection Byproduct with Current Potential Disinfectant of Chlorine and Chloramines

摘要

The inactivation removal of Copepod of Zooplankton with different disinfectants, Chlorine and Chloramines, were investigated in a southern China waterworks. The experimental results showed that Copepod inactivation rates were 70% and 90% respectively under chlorine dosage of 2.0mg/L and 2.5mg/L when contacting for 30 min. The inactivation rates were 90% and 100% respectively under same dosage condition for Chloramines disinfection. In the range of pH 3.5-10, the inactivation rates still maintained more than 80% with chloramines, but in the case of chlorine, it declined rapidly as pH value was increased from 6 to 10. In the range of organic content from 3 to 6mg/L, inactivation rate of chlorine decreased from 90% to 40%, while for chloramines it still kept at about 70% under the organic content of 6mg/L condition. The GC-MS examination indicated that total organic substance by chlorine disinfection was increased to 96 species from 83 species of raw water, in which 16 species of halogenated disinfection byproduct occurred in treated water. But for chloramines, only 2 species were observed in treated water. The results of Ames test showed that MR value of water sample by chlorination was higher than that by chloramines at the same doses.