Modelling of Escherichia coli removal by a low-cost combined drinking water treatment system

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dc.contributor.authorSiwila, Stephenen_ZA
dc.contributor.authorBrink, Isobel C.en_ZA
dc.date.accessioned2022-04-12T08:39:11Zen_ZA
dc.date.available2022-04-12T08:39:11Zen_ZA
dc.date.issued2020-08en_ZA
dc.descriptionCITATION: Siwila, Stephen & Brink, Isobel C. 2020. Modelling of Escherichia coli removal by a low-cost combined drinking water treatment system. Water Supply, 20(5):1757–1775, doi:10.2166/ws.2020.084.en_ZA
dc.descriptionThe original publication is available at: https://iwaponline.comen_ZA
dc.description.abstractENGLISH ABSTRACT: This work presents mathematical modelling of Escherichia coli (E. coli) removal by a multi-barrier point-of-use drinking water system. The modelled system is a combination of three treatment stages: filtration by geotextile fabric followed by filtration and disinfection by silver-coated ceramic granular media (SCCGM) then granular activated carbon (GAC) filtration. The presented models accounted for removal mechanisms by each treatment stage. E. coli was modelled as a microbial particle. E. coli inactivation by SCCGM was modelled using the Chick’s, Chick-Watson, Collins-Selleck and complete mix system bacterial inactivation kinetic models, which were considered adequately representative for describing the removal. Geotextile removal was modelled using colloidal filtration theory (CFT) for hydrosol deposition in fibrous media. The filtration removal contributions by the SCCGM and GAC were modelled using CFT for removal of colloidal particles by granular media. The model results showed that inactivation by silver in the SCCGM was the main bacterial removal mechanism. Geotextile and GAC also depicted appreciable removals. The theoretical modelling approach used is important for design and optimization of the multi-barrier system and can support future research in terms of material combinations, system costs, etc. Collector diameter, particle size, filtration velocity and contact time were identified as critical parameters for E. coli removal efficiency.en_ZA
dc.description.versionPublisher's versionen_ZA
dc.format.extent19 pagesen_ZA
dc.identifier.citationSiwila, Stephen & Brink, Isobel C. 2020. Modelling of Escherichia coli removal by a low-cost combined drinking water treatment system. Water Supply, 20(5):1757–1775, doi:10.2166/ws.2020.084en_ZA
dc.identifier.issn1607-0798 (online)en_ZA
dc.identifier.issn1606-9749 (print)en_ZA
dc.identifier.otherdoi:10.2166/ws.2020.084en_ZA
dc.identifier.urihttp://hdl.handle.net/10019.1/124448en_ZA
dc.language.isoen_ZAen_ZA
dc.publisherIWA Publishingen_ZA
dc.rights.holderAuthors retain copyrighten_ZA
dc.subjectDrinking water -- Purificationen_ZA
dc.subjectColloidal filtration theoryen_ZA
dc.subjectEscherichia colien_ZA
dc.subjectColloidsen_ZA
dc.subjectWater-supply engineeringen_ZA
dc.titleModelling of Escherichia coli removal by a low-cost combined drinking water treatment systemen_ZA
dc.typeArticleen_ZA
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