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Examination of the behaviour of Escherichia coli in biofilms established in laboratory-scale units receiving chlorinated and chloraminated water.
Momba, Maggy N. B. Cloete, T. E. Venter, S. N. Kfir, B.
Momba, Maggy N. B.
Cloete, T. E.
Venter, S. N.
Kfir, B.
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Abstract
Groundwater was treated with chlorine and chloramine to study the incorporation and survival of Escherichia coli in developing biofilms in laboratory-scale units. Membrane filter and standard spread plate procedure were used to enumerate coliform and heterotrophic plate count bacteria respectively. Within 96 h the adhesion of heterotrophic plate count bacteria on stainless steel coupons was obvious in all systems, with a higher number of organisms (4 log cfu cmÿ2) noted for the non-disinfected water. Attachment of E. coli added 24 h after the formation of young biofilms was obvious on stainless steel coupons exposed to the non-disinfected water (9 cfu cmÿ2) and chlorinated water (2 cfu cmÿ2). A significant difference between E. coli counts in the non-disinfected water and chloraminated water, and the chlorinated and chloraminated water, was found. However, the ANOVA test indicated no significant difference in E. coli counts for the non-disinfected water and chlorinated water. This investigation revealed the effectiveness of chloramine in preventing the attachment of E. coli in developing biofilm.
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Date
1998-12-01
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Elsevier
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Momba 68.pdf
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Keywords
E. coli, Biolm, Chlorinated water, Chloraminated water
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Attribution-NonCommercial-ShareAlike 4.0 International