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Journal Article

# Disinfection of Amoebic Cysts in Water with Free Chlorine

Alan J. Rubin, John P. Engel and Otis J. Sproul
Journal (Water Pollution Control Federation)
Vol. 55, No. 9, Annual Conference Issue (Sep., 1983), pp. 1174-1182
Stable URL: http://www.jstor.org/stable/25042055
Page Count: 9

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## Abstract

Cysts of the amoeba Naegleria gruberi were inactivated by free chlorine at 25°C; kinetics of the process were studied at pH 5, 7, and 9. Results deviated from Chick's law, as do the results obtained with other organisms. Two other models fit the data more successfully. As expected, HOCl was more effective as a disinfectant than ${\rm OCl}^{-}$. Except for the effect on chlorine hydrolysis, pH was of little importance. The Watson's law coefficient of dilution was close to one. Comparison of C·t products suggests that cysts of N. gruberi at pH 7 are about equally as sensitive to chlorine as are other amoebas but are much more resistant than are bacteria and poliovirus.

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