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 Field
Value
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
Author Affiliations
  1. The University of Hong Kong
  2. Tsinghua University