Abstract
In order to study the effect of chlorine (Cl2) inactivating Cryptosporidium and Giardia 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 and Giardia was 1×106 cysts/mL, turbidity 1.0NTU, temperature 22°C, pH 7.0, and after 280 min reaction, under the condition that the Cl2 concentrations was 8.0mg/L, the inactivation ratio could be more than 99%. With increases in turbidity, the inactivating effect decreased. If the inactivating time achieved 360 min, it could meet the presetting inactivation ratio with turbidity 0.1~10.0 NTU. The inactivating capability of Cl2 was found to be stronger under acidic than that under alkalic conditions. Inactivation rate improves with a temperature increase from 5 to 25°C, but decreases beyond this.
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