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Evaluation of the natural coagulant Moringa oleifera as a pretreatment for SODIS in contaminated turbid water

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Show simple item record Keogh, Michael B. Elmusharaf, Khalifa Borde, Preeti McGuigan, Kevin G. 2017-10-13T08:43:53Z 2017-10-13T08:43:53Z 2017
dc.description peer-reviewed en_US
dc.description.abstract Solar Disinfection of water (SODIS) is a treatment method that traditionally exposes low turbidity water filled in clear bottles to direct sunlight up to 6 h. Typically, water should have turbidity lower than 30 NTU before solar exposure; however turbidities of water sources in communities vary and can reach higher than 200 NTU. In order to reduce turbidity, flocculating agents like Moringa oleifera (Moringa) may be used. In this study we assess the efficacy of Moringa to clear turbid water as a pretreatment for SODIS. We initially evaluate two preparations– powdered seeds and an aqueous filtrate of the seeds, to determine if these can benefit SODIS in turbid, E. coli contaminated water (Experiment 1). We show that powdered Moringa seeds reduce turbidity best and that SODIS treatment of highly turbid water was effective regardless of reduced turbidity. Overnight, however; a bio-active sludge layer formed. We then determined if 24 h Moringa pretreatment and decanting can maintain water quality over an extended period (Experiment 2). After 24 h Moringa treatment showed a 2.1 log reduction in E. coli, increasing following SODIS (6-log) E. coli without nightly recovery or sludge formation. Untreated turbid controls showed SODIS disinfection after 6 h direct sunlight; however, nightly regrowth and sludge layer formation occurred by 48 h. These results suggest that SODIS is capable of inactivating bacteria in highly turbid water at 6 h; however, active biofilm sludge layers formed by 48 h. We conclude that, for longer term water storage, we find a combination of Moringa seed powder pretreatment prior to SODIS to be optimal. en_US
dc.language.iso eng en_US
dc.publisher Elsevier en_US
dc.relation.ispartofseries Solar Energy;158, pp. 448-454
dc.subject SODIS en_US
dc.subject Moringa oleifera en_US
dc.subject water treatment en_US
dc.subject turbidity en_US
dc.subject flocculation en_US
dc.title Evaluation of the natural coagulant Moringa oleifera as a pretreatment for SODIS in contaminated turbid water en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US 2017-10-13T08:17:14Z
dc.description.version PUBLISHED
dc.identifier.doi 10.1016/j.solener.2017.10.010
dc.contributor.sponsor RCSI Research Committee Bahrain en_US
dc.contributor.sponsor HRH Princess Haya Bint Al Hussein Foundation en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US
dc.internal.rssid 2725778
dc.internal.copyrightchecked Yes
dc.identifier.journaltitle Solar Energy
dc.description.status peer-reviewed

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