Effects of storage on water treatment plant sludges

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dc.contributor.authorCumbie, William E.en
dc.contributor.committeecochairHoehn, Robert C.en
dc.contributor.committeememberNovak, John T.en
dc.contributor.committeememberKnocke, William R.en
dc.contributor.departmentSanitary Engineeringen
dc.date.accessioned2014-03-14T21:49:14Zen
dc.date.adate2012-11-09en
dc.date.available2014-03-14T21:49:14Zen
dc.date.issued1985-12-27en
dc.date.rdate2012-11-09en
dc.date.sdate2012-11-09en
dc.description.abstractThe effects of in-basin storage of sludge on the iron, manganese, and TOC removal of water treatment plant (WTP) clarifiers and on the dewatering characteristics of sludge were examined. The use of chlorine dioxide as a preoxidant to retard observed detrimental effects was also investigated. Sludge samples that were stored over a period of 120 days were found to release up to ten times the original supernatant concentration of iron and manganese from the sludge into the overlying supernatant liquor when sludge redox potential values decreased below +100 mV. Organic carbon also increased in the supernatant but to a lesser extent. Sludge dewatering characteristics as measured by specific resistance and capillary suction time were found to improve when sludge redox potential readings remained over 100 mV but varied greatly when readings were below this level. Field monitoring and sampling of the clarifiers at Lee Hall WTP and Harwood's Mill WTP from April to July showed that the removal efficiencies of the clarifiers was not related to in-basin sludge storage. This conflicted with a later portion of the study and was thought to be due to the lack of standardized sampling techniques. The final phase of the investigation dealt with the use of chlorine dioxide to retard the negative effects of in-basin storage of sludge. Sludge accumulation in clarifiers resulted in decreased iron and manganese removal efficiencies when chlorine dioxide was not used. Addition of chlorine dioxide improved the iron and manganese removal efficiencies of the clarifiers. Sludge dewatering characteristics were found to improve with the use of chlorine dioxide as a preoxidant.en
dc.description.degreeMaster of Scienceen
dc.format.extentxi, 100 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-11092012-040020en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-11092012-040020/en
dc.identifier.urihttp://hdl.handle.net/10919/45542en
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1985.C96.pdfen
dc.relation.isformatofOCLC# 13488785en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1985.C96en
dc.subject.lcshSewage lagoonsen
dc.subject.lcshSewage sludgeen
dc.subject.lcshSewage -- Oxidationen
dc.titleEffects of storage on water treatment plant sludgesen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineSanitary Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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