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dc.contributor.advisorKey, D.L.
dc.contributor.authorSiguba, Maxhobandile
dc.date.accessioned2022-03-10T11:11:25Z
dc.date.available2022-03-10T11:11:25Z
dc.date.issued2005
dc.identifier.urihttp://hdl.handle.net/11394/8874
dc.description>Magister Scientiae - MScen_US
dc.description.abstractA comparative study of electrolysers using different anodic materials for the electrolysis of brine (sodium chloride) for the production of sodium hypochlorite as a source of A comparative study of electrolysers using different anodic materials for the electrolysis of brine (sodium chloride) for the production of sodium hypochlorite as a source of available chlorine for disinfection of rural water supplies has been undertaken. The electrolyser design used was tubular in form, having two chambers i.e. anode inside and cathode outside, separated by a tubular inorganic ceramic membrane. The anode was made of titanium rod coated with a thin layer of platinum and a further coat of metal oxide. The cathode was made of stainless steel wire. available chlorine for disinfection of rural water supplies has been undertaken. The electrolyser design used was tubular in form, having two chambers i.e. anode inside and cathode outside, separated by a tubular inorganic ceramic membrane. The anode was made of titanium rod coated with a thin layer of platinum and a further coat of metal oxide. The cathode was made of stainless steel wire. An assessment of these electrolysers was undertaken by studying the effects of some variable parameters i.e. current, voltage and sodium chloride concentration. The flow rate was kept unchanged at 50ml/h anolyte and 140ml/h catholyte since it was found to be optimum flow rate for chlorine generation. Figures of merit of the electrolysers were calculated on the basis of three sets of measurements. Analytical methods used for the determination of sodium hypochlorite concentration were iodometric and N, N-Diethyl-p- Phenylenediamine (DPD) titration methods. The DPD titration method was used to determine the chlorine concentration of less than 1mg/L, while the iodometric titration method was used to determine chlorine concentration of ImgIL and above. Sodium chlorate present in the hypochlorite solution was also determined using a spectrophotometric method. The cobalt oxide electrolyser has been shown to be superior as compared to the ruthenium dioxide and manganese dioxide electrolysers in terms of hypochlorite generation. Sodium chlorate was present but at concentration levels not hazardous for use in dosing water for drinking purposes. Analysis of hydroxyl radicals was undertaken since there were claims that these are produced during brine electrolysis. Hydroxyl radical analysis was not successful, since sodium hypochlorite and hypochlorous acid interfere using the analytical method described in this study.en_US
dc.language.isoenen_US
dc.publisherUniversity of the Western Capeen_US
dc.subjectAcid constanten_US
dc.subjectCurrent efficiencyen_US
dc.subjectDepartment of Water Affairs and Forestry (DWAF)en_US
dc.subjectDimensionally stable anodes (DSA)en_US
dc.subjectDimethyl sulfoxide (DMSO)en_US
dc.subjectCobalt oxide titanium anodes (COTA)en_US
dc.subjectFerrous Ammonium Sulphate (FAS)en_US
dc.titleThe Development of Appropriate Brine Electrolysers for Disinfection of Rural water suppliesen_US
dc.rights.holderUniversity of the Western Capeen_US


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