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Article: Electron microscopic investigation of the bactericidal action of electrochemical disinfection in comparison with chlorination, ozonation and Fenton reaction

TitleElectron microscopic investigation of the bactericidal action of electrochemical disinfection in comparison with chlorination, ozonation and Fenton reaction
Authors
KeywordsChlorination
Electrochemical
Free radical
Ozonation
Scanning electron microscopy (SEM)
Wastewater disinfection
Issue Date2004
PublisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/procbio
Citation
Process Biochemistry, 2004, v. 39 n. 11, p. 1421-1426 How to Cite?
AbstractLaboratory experiments were carried out to investigate the mechanisms of electrochemical (EC) disinfection of artificial wastewater contaminated by Escherichia coli culture. Comparative disinfection tests with chlorine, ozone and hydroxyl (·OH-) radicals produced by the Fenton reaction were also conducted. It was demonstrated that the EC process was highly effective for wastewater disinfection. Investigation with scanning electron microscopy (SEM) showed different appearances of damage to in the surface morphology and structure of the cells after different forms of disinfection. Substantial leakage of intracellular materials was found for the E. coli cells after EC disinfection, which was also observed for the cells treated by the Fenton reaction. However, such cell lysis was noticeable to a less extent for the ozonated cells and hardly noticeable for the chlorinated cells. Electron microscopic examination suggested that the cells were likely inactivated during the EC process by the chemical products with an oxidising power similar to that of hydroxyl radicals and much stronger than that of chlorine. The SEM results support the hypothesis that the predominant killing action of EC disinfection is provided by high-energy intermediate EC products. Therefore, in addition to electro-chlorination, the great capacity of EC disinfection may be attributable to the generation of short-lived germicidal agents, such as free radicals. © 2003 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/71663
ISSN
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorDiao, HFen_HK
dc.contributor.authorLi, XYen_HK
dc.contributor.authorGu, JDen_HK
dc.contributor.authorShi, HCen_HK
dc.contributor.authorXie, ZMen_HK
dc.date.accessioned2010-09-06T06:34:02Z-
dc.date.available2010-09-06T06:34:02Z-
dc.date.issued2004en_HK
dc.identifier.citationProcess Biochemistry, 2004, v. 39 n. 11, p. 1421-1426en_HK
dc.identifier.issn0032-9592en_HK
dc.identifier.urihttp://hdl.handle.net/10722/71663-
dc.description.abstractLaboratory experiments were carried out to investigate the mechanisms of electrochemical (EC) disinfection of artificial wastewater contaminated by Escherichia coli culture. Comparative disinfection tests with chlorine, ozone and hydroxyl (·OH-) radicals produced by the Fenton reaction were also conducted. It was demonstrated that the EC process was highly effective for wastewater disinfection. Investigation with scanning electron microscopy (SEM) showed different appearances of damage to in the surface morphology and structure of the cells after different forms of disinfection. Substantial leakage of intracellular materials was found for the E. coli cells after EC disinfection, which was also observed for the cells treated by the Fenton reaction. However, such cell lysis was noticeable to a less extent for the ozonated cells and hardly noticeable for the chlorinated cells. Electron microscopic examination suggested that the cells were likely inactivated during the EC process by the chemical products with an oxidising power similar to that of hydroxyl radicals and much stronger than that of chlorine. The SEM results support the hypothesis that the predominant killing action of EC disinfection is provided by high-energy intermediate EC products. Therefore, in addition to electro-chlorination, the great capacity of EC disinfection may be attributable to the generation of short-lived germicidal agents, such as free radicals. © 2003 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/procbioen_HK
dc.relation.ispartofProcess Biochemistryen_HK
dc.rightsProcess Biochemistry. Copyright © Elsevier Ltd.en_HK
dc.subjectChlorinationen_HK
dc.subjectElectrochemicalen_HK
dc.subjectFree radicalen_HK
dc.subjectOzonationen_HK
dc.subjectScanning electron microscopy (SEM)en_HK
dc.subjectWastewater disinfectionen_HK
dc.titleElectron microscopic investigation of the bactericidal action of electrochemical disinfection in comparison with chlorination, ozonation and Fenton reactionen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1359-5113&volume=39&spage=1421&epage=1426&date=2004&atitle=Electron+microscopic+investigation+of+the+bactericidal+action+of+electrochemical+disinfection+in+comparison+with+chlorination,+ozonation+and+Fenton+reactionen_HK
dc.identifier.emailLi, XY: xlia@hkucc.hku.hken_HK
dc.identifier.emailGu, JD: jdgu@hkucc.hku.hken_HK
dc.identifier.authorityLi, XY=rp00222en_HK
dc.identifier.authorityGu, JD=rp00701en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/S0032-9592(03)00274-7en_HK
dc.identifier.scopuseid_2-s2.0-3042808855en_HK
dc.identifier.hkuros89776en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-3042808855&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume39en_HK
dc.identifier.issue11en_HK
dc.identifier.spage1421en_HK
dc.identifier.epage1426en_HK
dc.identifier.isiWOS:000223089500013-
dc.identifier.scopusauthoridDiao, HF=7004492029en_HK
dc.identifier.scopusauthoridLi, XY=26642887900en_HK
dc.identifier.scopusauthoridGu, JD=7403129601en_HK
dc.identifier.scopusauthoridShi, HC=8379847000en_HK
dc.identifier.scopusauthoridXie, ZM=36055453500en_HK

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