Chlorine dioxide by-products in drinking water and their control by powdered activated carbon

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dc.contributor.authorGrabeel, Margaret N.en
dc.contributor.committeechairHoehn, Robert C.en
dc.contributor.committeememberDietrich, Andrea M.en
dc.contributor.committeememberGallagher, Daniel L.en
dc.contributor.departmentEnvironmental Engineeringen
dc.date.accessioned2014-03-14T21:52:22Zen
dc.date.adate2009-12-23en
dc.date.available2014-03-14T21:52:22Zen
dc.date.issued1992-05-05en
dc.date.rdate2009-12-23en
dc.date.sdate2009-12-23en
dc.description.abstractThe concentrations of chlorine dioxide (CI02), chlorine, chlorite (CIO2), and chlorate (CI03) were evaluated following pretreatment of raw water by CI02 at water treatment plants in New Castle, Pennsylvania; Charleston, West Virginia; Skagit, Washington; and Columbus, Georgia. Chlorite and chlorate concentrations were unaffected by any of the water treatment processes and did not vary as a function of time of travel in the distribution system. Chlorine dioxide, which was analyzed on-site at two water treatment plants, reformed in the clear well and in the distribution system following post chlorination. The chlorite-removal capability of powdered activated carbon (PAC) was evaluated in both laboratory- and pilot-scale studies. Chlorite removal by PAC in laboratory studies decreased with increasing pH over a range from pH 5.5 to 7.5 and varied with the type of PAC. Chlorite was reduced to chloride at pHs ranging from 5.5 to 7.5, but CI03- formed at the pH 5.5 through 6.0. The pilot plant study; which was conducted at Newport News, Virginia; evaluated CI02 removal by PAC enmeshed in a floc blanket in a pulsed-bed, solids-contact clarifier. An average of 27 percent of the CI02 was removed when the PAC dose was 10 mg/L PAC and 57 percent when it was 20 mg/L PAC. Chlorate was not removed by PAC, but the concentrations could be reduced if the CIOz generator was properly operated.en
dc.description.degreeMaster of Scienceen
dc.format.extentxi, 166 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-12232009-020452en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-12232009-020452/en
dc.identifier.urihttp://hdl.handle.net/10919/46394en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1992.G72.pdfen
dc.relation.isformatofOCLC# 27408112en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1992.G72en
dc.subject.lcshCarbon, Activateden
dc.subject.lcshChlorine dioxideen
dc.subject.lcshDrinking wateren
dc.titleChlorine dioxide by-products in drinking water and their control by powdered activated carbonen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineEnvironmental Planningen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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