Inactivation of Cryptosporidium and Giardia by Chlorine in Water

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.

• Periodical: Advanced Materials Research (Volumes 726-731)
• Pages: 392-395
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.726-731.392
• Online since: August 2013
• Authors: Zhi Lin Ran, Shao Feng Li
• Keywords: Chlorine, Cryptosporidium, Effect Factors, Giardia, Inactivation

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