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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/25518

Title: Impact of Water Quality on Solar Disinfection (SODIS): Investigating a Natural Coagulant Pretreatment on the Photoinactivation of Escherichia coli
Authors: Wilson, Sarah
Advisor: Andrews, Susan
Department: Civil Engineering
Keywords: solar disinfection
drinking water treatment
Escherichia coli
pretreatment
coagulation
Moringa oleifera
Issue Date: 30-Dec-2010
Abstract: Solar water disinfection (SODIS) is the process of treating microbiologically contaminated water in clear plastic bottles through exposure to sunlight. One of the major limiting factors of this treatment is source water quality. This work investigates the impact of organic matter and turbidity on SODIS efficiency. Organic matter was found to decrease bacterial inactivation to a much greater extent than the presence of inorganic particles. The ability of moringa oleifera seed emulsion to clarify source waters was investigated as a coagulation pretreatment. This coagulant is most effective in highly turbid, high humic content waters, and achieves up to 1-log bacterial removal. The combined moringa oleifera coagulation-SODIS treatment sequence was tested in highly coloured natural source water and was found to reduce the sunlight exposure time required by up to 2 hours. Treated water should be consumed immediately following the individual or combined treatments due to the potential for bacterial regrowth.
URI: http://hdl.handle.net/1807/25518
Appears in Collections:Master
Department of Civil Engineering - Master theses

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