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Article: Electron microscopic investigation of the bactericidal action of electrochemical disinfection in comparison with chlorination, ozonation and Fenton reaction
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TitleElectron microscopic investigation of the bactericidal action of electrochemical disinfection in comparison with chlorination, ozonation and Fenton reaction
 
AuthorsDiao, HF2
Li, XY1
Gu, JD1
Shi, HC2
Xie, ZM1
 
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
 
CitationProcess Biochemistry, 2004, v. 39 n. 11, p. 1421-1426 [How to Cite?]
DOI: http://dx.doi.org/10.1016/S0032-9592(03)00274-7
 
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.
 
ISSN0032-9592
 
DOIhttp://dx.doi.org/10.1016/S0032-9592(03)00274-7
 
ISI Accession Number IDWOS:000223089500013
 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorDiao, HF
 
dc.contributor.authorLi, XY
 
dc.contributor.authorGu, JD
 
dc.contributor.authorShi, HC
 
dc.contributor.authorXie, ZM
 
dc.date.accessioned2010-09-06T06:34:02Z
 
dc.date.available2010-09-06T06:34:02Z
 
dc.date.issued2004
 
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.
 
dc.description.natureLink_to_subscribed_fulltext
 
dc.identifier.citationProcess Biochemistry, 2004, v. 39 n. 11, p. 1421-1426 [How to Cite?]
DOI: http://dx.doi.org/10.1016/S0032-9592(03)00274-7
 
dc.identifier.doihttp://dx.doi.org/10.1016/S0032-9592(03)00274-7
 
dc.identifier.epage1426
 
dc.identifier.hkuros89776
 
dc.identifier.isiWOS:000223089500013
 
dc.identifier.issn0032-9592
 
dc.identifier.issue11
 
dc.identifier.openurl
 
dc.identifier.scopuseid_2-s2.0-3042808855
 
dc.identifier.spage1421
 
dc.identifier.urihttp://hdl.handle.net/10722/71663
 
dc.identifier.volume39
 
dc.languageeng
 
dc.publisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/procbio
 
dc.relation.ispartofProcess Biochemistry
 
dc.relation.referencesReferences in Scopus
 
dc.rightsProcess Biochemistry. Copyright © Elsevier Ltd.
 
dc.subjectChlorination
 
dc.subjectElectrochemical
 
dc.subjectFree radical
 
dc.subjectOzonation
 
dc.subjectScanning electron microscopy (SEM)
 
dc.subjectWastewater disinfection
 
dc.titleElectron microscopic investigation of the bactericidal action of electrochemical disinfection in comparison with chlorination, ozonation and Fenton reaction
 
dc.typeArticle
 
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Author Affiliations
  1. The University of Hong Kong
  2. Tsinghua University