International Rainwater Cistern Systems Conference
Khon Kaen, Thailand
- January, 1987
Section F: Water Quality
A Case History of Disinfection
of Water in Rural Areas of Mexico
Michael C. R. Owen
Cheyne Owen Ltd.
Charles P. Gerba
Department of Microbiology and Immunology
University of Arizona
Effective use rainwater as a source of water supply in rural
and urban areas of the world, requires storage and containment in surface
reservoirs, cisterns or tanks. While the purity of rainwater can be high when
initially collected, especially in rural areas away from industrial air
pollution, storage of water for long periods of time can subject this valuable
resource to contamination from disease vectors, blowing dust and dirt,
bacterial contamination from collection surfaces and direct contamination.
The purpose of this paper is to provide a case history of an
alternative disinfection method whereby water storage vessels may be rendered
virtually free of pathogenic and nuisance microorganisms for long periods of
time, thus providing a reliable disinfected water supply
A silver based colloidal suspension of silver in a protein
carrier has been used successfully throughout Mexico to disinfect rural, urban,
and institutional water tanks for up to one year by coating the inside
surfaces. When dry the coating becomes har, but slowly redisolves and
disinfects the water over a long period of time. Recent laboratory research
confirms the efficacy of this disinfection method.
PDF of full document (17pp, 440kb)
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