Chlorine residual efficiency in inactivating bacteria from secondary contamination in Isfahan, 2002.
East Mediterr Health J
; 11(3): 425-34, 2005 May.
Article
em En
| MEDLINE
| ID: mdl-16602463
ABSTRACT
To investigate the inactivation of potential pathogens, we evaluated survival rates for Escherichia coli, Enterococcus faecalis, Aeromonas hydrophila and Salmonella typhi in samples taken from the Isfahan drinking water system. Chlorine residual, pH, temperature and total organic carbon levels were measured. The organism most sensitive to chlorine was A. hydrophila. It was inactived in < 100 minutes at chlorine levels of 0.11 mg/L to 0.90 mg/L. The other 3 organisms showed higher resistance. E. coli tolerated 0.30 mg/L chlorine for > 1000 minutes while Ent. faecalis and S. typhi survived at total chlorine concentration of 0.50 mg/L for 100 minutes. We concluded that total chlorine levels of less than 0.71 mg/L in water supply systems cannot provide the recommended safety levels.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Microbiologia da Água
/
Cloro
/
Purificação da Água
Tipo de estudo:
Guideline
Limite:
Humans
País/Região como assunto:
Asia
Idioma:
En
Revista:
East Mediterr Health J
Assunto da revista:
MEDICINA
Ano de publicação:
2005
Tipo de documento:
Article