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The effect of pH, coagulation and chlorination on the production of potable water from eutrophied surface water

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dc.contributor.author Basson ND en
dc.date.accessioned 2016-09-26T06:08:59Z
dc.date.available 2016-09-26T06:08:59Z
dc.date.submitted 2000 en
dc.identifier.uri http://hdl.handle.net/20.500.11892/164447
dc.description.abstract The eutrophic nature of the water in the middle Vaal River gives rise to many operational difficulties and high treatment costs at water purification plants using this source for the supply of potable water. At the Balkfontein plant of Goudveld Water possible causes for the problems were identified. It was decided, from a quality and cost point of view, to evaluate and optimise existing processes and process configurations rather than to investigate the implementation of new and advanced technologies. The aims of this study were to: 1. Investigate, on bench scale, the effects of pH, dosage and point of chlorine dosing and coagulant type and dosage on a) the removal of algae and algal products b) the formation of trihalomethanes (THMs). 2. Identify from these investigations optimal process conditions of pH, chlorine dosage and dosing point and coagulants for the Balkfontein plant. 3. Verify plant performance, when operating under these conditions, by means of full- scale investigations. The final conclusions of this study are: 1. Efficient removal of chlorophyll-α and algal cells can be obtained by; a) increasing the coagulant dosage or adding a cationic poly-electrolyte as secondary coagulant. b) applying intermediate chlorination. c) If pre-chlorination is excluded from the treatment process, increasing the coagulation pH by adding lime results in an increased removal of chlorophyll-α. 2. Removal of organic substances is enhanced by replacing pre-chlorination with intermediate chlorination. 3. Trihalomethanes formation potential (THMFP) is reduced by replacing pre- chlorinating with intermediate chlorination. 4. Increasing the coagulation pH, however, adversely affects: a) organic removal (measured as DOC) and consequently probably enhances the formation of THMs b) the removal of some algal species. en
dc.language English en
dc.subject Hydraulic engineering en
dc.title The effect of pH, coagulation and chlorination on the production of potable water from eutrophied surface water en
dc.type Masters degree en
dc.description.degree MSc (Waterbenutting) en

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