Abstract

ABRAMOVICH, B. et al. The action of different coagulants to remove Cryptosporidium during the process of water treatment. Rev. argent. microbiol. [online]. 2004, vol.36, n.2, pp.92-96. ISSN 0325-7541.

Cryptosporidium is one of the microorganisms of main concern from the point of view of Public Health, being a priority problem for water treatment plants and water regulatory institutions. Due to its small size and resistance to chlorination, Cryptosporidium removal during the process of drinking water treatmentis a hard task. The effectiveness of different coagulants commonly used in the process of removal of oocysts was analyzed. Thetechnique used was the Jar Test. It was found that: 1) coagulants with the addition of polimeric coadjuvants produce over 2 logs of oocyst removal; 2) a low value in turbidity does not necessarily mean optimal parasite removal, and 3) the addition of polyelectrolites to ferric chloride diminishes variability, both in final turbidity and Cryptosporidium removal.

Keywords : Cryptosporidium; water; drinking water treatment; coagulants.

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