Effect of various factors on chlorine inactivating Cryptosporidium in water.

In order to study the effect of Cl2 inactivating Cryptosporidium in water,different factors as Cl2 concentration,contact time,pH,temperature,turbidity and organic content which might influence the inactivation were studied by using fluorescence staining method.With the Cryptosporidium concentration was 1×106/mL,turbidity 1.0NTU,temperature 22 ℃,pH 7.0,and after 360 min reaction,under the condition that the Cl2 concentrations was 6.3mg/L,the inactivation ratio could be more than 99%.The lower turbidity was,the higher inactivating ratio could be received.If the inactivating time achieved 900min,it could meet the presetting inactivation ratio with turbidity 0.1~20.0 NTU.The ability of Cl2 inactivating Cryptosporidium was stronger under acidic condition than that in alkali circumstance.With the increasing temperature,the inactivating effect was increased.When the reaction system contained different concentration of organics(0~10.0 mg/L) and the inactivating time 360min,the inactivation ratio reduced with concentration increasing.Besides,when the inactivating time achieved 900min,the inactivation ratio could achieve 99%.