Electrochemically activated water as an alternative to chlorine for decentralized disinfection

Handle URI:
http://hdl.handle.net/10754/575679
Title:
Electrochemically activated water as an alternative to chlorine for decentralized disinfection
Authors:
Ghebremichael, Kebreab A.; Muchelemba, E.; Petruševski, Branislav; Amy, Gary L.
Abstract:
Electrochemically activated (ECA) water is being extensively studied and considered as an alternative to chlorine for disinfection. Some researchers claim that ECA is by and large a chlorine solution, while others claim the presence of reactive oxygen species such as ozone and hydroxyl radicals in addition to chlorine. This study compares sodium hypochlorite (NaOCl) and ECA in terms of disinfection efficacy, trihalomethanes (THMs) formation, stability and composition. The studies were carried out under different process conditions (pH 5,7 and 9, disinfectant concentrations of 2-5 mg/L and dissolved organic carbon (DOC) concentration of 2-4 mg/L). The results indicated that in the presence of low DOC (<2 mg/L) ECA showed better disinfection efficacy for Escherichia coli inactivation, formed lower THM and had better stability compared with NaOCl at both pH 5 and 7. Stability studies of stock solutions showed that over a period of 30 days, ECA decayed by only 5% while NaOCl decayed by 37.5% at temperatures of 4 °C. In a fresh ECA of 200 mg/L chlorine, about 5.3 mg/L ozone and 36.9 mg/L ClO2 were detected. The study demonstrates that ECA could be a suitable alternative to NaOCl where decentralized production and use are required. © IWA Publishing 2011.
KAUST Department:
Water Desalination and Reuse Research Center (WDRC); Biological and Environmental Sciences and Engineering (BESE) Division
Publisher:
IWA Publishing
Journal:
Journal of Water Supply: Research and Technology—AQUA
Issue Date:
Jun-2011
DOI:
10.2166/aqua.2011.034
Type:
Article
ISSN:
00037214
Sponsors:
The authors would like to thank the Coca-Cola Company for supporting the research by financing the MSc study and by providing access to analytical facilities.
Appears in Collections:
Articles; Water Desalination and Reuse Research Center (WDRC); Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorGhebremichael, Kebreab A.en
dc.contributor.authorMuchelemba, E.en
dc.contributor.authorPetruševski, Branislaven
dc.contributor.authorAmy, Gary L.en
dc.date.accessioned2015-08-24T08:35:42Zen
dc.date.available2015-08-24T08:35:42Zen
dc.date.issued2011-06en
dc.identifier.issn00037214en
dc.identifier.doi10.2166/aqua.2011.034en
dc.identifier.urihttp://hdl.handle.net/10754/575679en
dc.description.abstractElectrochemically activated (ECA) water is being extensively studied and considered as an alternative to chlorine for disinfection. Some researchers claim that ECA is by and large a chlorine solution, while others claim the presence of reactive oxygen species such as ozone and hydroxyl radicals in addition to chlorine. This study compares sodium hypochlorite (NaOCl) and ECA in terms of disinfection efficacy, trihalomethanes (THMs) formation, stability and composition. The studies were carried out under different process conditions (pH 5,7 and 9, disinfectant concentrations of 2-5 mg/L and dissolved organic carbon (DOC) concentration of 2-4 mg/L). The results indicated that in the presence of low DOC (<2 mg/L) ECA showed better disinfection efficacy for Escherichia coli inactivation, formed lower THM and had better stability compared with NaOCl at both pH 5 and 7. Stability studies of stock solutions showed that over a period of 30 days, ECA decayed by only 5% while NaOCl decayed by 37.5% at temperatures of 4 °C. In a fresh ECA of 200 mg/L chlorine, about 5.3 mg/L ozone and 36.9 mg/L ClO2 were detected. The study demonstrates that ECA could be a suitable alternative to NaOCl where decentralized production and use are required. © IWA Publishing 2011.en
dc.description.sponsorshipThe authors would like to thank the Coca-Cola Company for supporting the research by financing the MSc study and by providing access to analytical facilities.en
dc.publisherIWA Publishingen
dc.subjectAnolyteen
dc.subjectDisinfectionen
dc.subjectE. colien
dc.subjectECAen
dc.subjectSodium hypochloriteen
dc.subjectTHMen
dc.titleElectrochemically activated water as an alternative to chlorine for decentralized disinfectionen
dc.typeArticleen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.identifier.journalJournal of Water Supply: Research and Technology—AQUAen
dc.contributor.institutionDepartment of Urban Water and Sanitation, UNESCO-IHE, Westvest 7, 2601 DA Delft, Netherlandsen
kaust.authorAmy, Gary L.en
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