An observational study on the effectiveness of point-of-use chlorination

J. Scott Meschke, Laura A. McLaughlin, Karen Levy, Nicola K. Beck, Gwy Am Shin, Joseph N. Eisenberg

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

22 Citas (Scopus)


Although the efficacy of chlorine disinfection under controlled laboratory conditions is well known, the effectiveness of chlorine under field point-of-use (POU) conditions is still not clearly understood and may be impacted by a variety of factors. This study evaluated the effectiveness of POU chlorine disinfection in rural Ecuador under typical use conditions and compared this effectiveness with the efficacy in controlled laboratory conditions. While reductions of indicator organisms were slightly higher in households that used chlorination, no significant differences were seen between households employing POU chlorination and the households with no chlorination (1-1.5 log 10 median reductions for chlorinating households and 0.31-0.55 log 10 for nonchlorinating households, depending on the indicator organism). In contrast, significant reduction of all test organisms was found when simulating POU conditions in the laboratory. This study demonstrates that POU chlorination can he considerably less effective under actual field conditions than would be predicted based on its laboratory efficacy (3-5 log 10 median reductions for chlorinated and 0-0.3 log 10 for nonchlorinated samples). Human factors (including improper storage and chlorine dosing) and uncontrolled water quality effects are hypothesized to impact significantly the effectiveness of chlorine disinfection.

Idioma originalInglés
Páginas (desde-hasta)48-53
Número de páginas6
PublicaciónJournal of Environmental Health
EstadoPublicada - abr. 2009


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