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dc.contributor.authorHayes, J.C.
dc.contributor.authorGarvey, Mary
dc.contributor.authorFogarty, Andrew M.
dc.contributor.authorClifford, Eoghan
dc.contributor.authorRowan, Neil J.
dc.identifier.citationHayes, J.C., Garvey, M., Fogarty, A.M., Clifford, E., Rowan, N.J.(2012). Inactivation of recalcitrant protozoan oocysts and bacterial endospores in drinking water using high-intensity pulsed light irradiation.. Water Science & Technology: Water Supply. 64(6), 1218-1225. doi: 10.2166/ws.2012.017en_US
dc.identifier.otherArticles - Life and Physical Sciences AITen_US
dc.description.abstractThis constitutes the first study to compare the use of high-intensity pulsed UV light (PUV) irradiation for the novel destruction of harmful protozoan (Cryptosporidium parvum Iowa isolate) oocysts and bacterial (Clostridium perfringens ATCC 13124 and Bacillus cereus ATCC 11178) endospores in artificially-spiked water where these organisms are resistant to conventional chlorination. Experimental results revealed that all three test organisms in their dormant recalcitrant state required extended levels of pulsing to achieve significant reductions in numbers compared to other similarly PUV-treated Escherichia coli ATCC 25922 that is a non-spore forming indicator of faecal pollution in water. 120 pulses at 900 V or 16.2 J per pulse (equivalent to a UV dose of 8.39 μJ cm 2) were required to achieve ca. 2 log C. perfringens spore numbers, whereas a similar level of PUV irradiation reduced both C. parvum oocysts and B. cereus endospores by ca. 5 log orders. A comparative ca. 5 log reduction of E. coli cell numbers was achieved after only 25 pulses at 900 V (equivalent to a UV dose of 1.74 μJ cm 2). A clear trend emerged where the order of resistance to PUV-irradiation observed was C. perfringens endospores > C. parvum oocysts, B. cereus endospores > E. coli cells. This study suggests disinfection kinetic data for the more resistant C. perfringens endospores can be used as a measure of estimating disinfection efficacy of PUV treatments for C. parvum oocysts in water, avoiding the need to use complex animal or cell culture infectivity models that are only available in specialised laboratories with highly trained technicians. This study will inform future studies exploring scale-up of PUV at waste-water treatment plants.en_US
dc.publisherIWA Publishingen_US
dc.relation.ispartofWater Science & Technology: Water Supplyen_US
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Ireland*
dc.subjectCryptosporidium parvum oocystsen_US
dc.subjectIndicator speciesen_US
dc.subjectNovel water treatmenten_US
dc.subjectPulsed UV lighten_US
dc.subjectRecalcitrant bacterial endosporesen_US
dc.titleInactivation of recalcitrant protozoan oocysts and bacterial endospores in drinking water using high-intensity pulsed light irradiation.en_US
dc.identifier.doidoi: 10.2166/ws.2012.017
dc.rights.accessOpen Accessen_US
dc.subject.departmentFaculty of Science and Healthen_US

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Attribution-NonCommercial-NoDerivs 3.0 Ireland
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 3.0 Ireland