Aging and Copper Corrosion By-Product Release: Role of Common Anions, Impact of Silica and Chlorine, and Mitigating Release in New Pipe

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dc.contributor.authorPowers, Kimberly Aliceen
dc.contributor.committeechairEdwards, Marc A.en
dc.contributor.committeememberGallagher, Daniel L.en
dc.contributor.committeememberDietrich, Andrea M.en
dc.contributor.departmentCivil Engineeringen
dc.date.accessioned2014-03-14T20:31:00Zen
dc.date.adate2001-01-24en
dc.date.available2014-03-14T20:31:00Zen
dc.date.issued2000-12-15en
dc.date.rdate2002-01-24en
dc.date.sdate2001-01-22en
dc.description.abstractIt is desirable to reduce leaching of copper from home plumbing because of environmental concerns and to comply with stringent regulation of copper in wastewater and drinking water. The solubility of the scale (oxidized copper rust layer) on the copper pipe wall, which directly contacts drinking water, is a key factor controlling the maximum soluble copper release. Gradual replacement of soluble Cu(OH)2 scale to less soluble scale is desirable and occurs through a process known as "aging. The presence of sulfate, bicarbonate and orthophosphate in water can quickly convert Cu(OH)2 to less soluble solids. In some cases, this produces a desirable short-term reduction in copper solubility, but over longer time periods formation of these solids can be detrimental because they interfere with formation of very low solubility tenorite (CuO)or malachite phases. Likewise, silica present in water can sorb to Cu(OH)2 and hinder aging to low solubility tenorite, while the presence of chlorine can hasten aging by a chemical reaction with cupric species that has never been previously observed in the drinking water field. Mild chemical treatments that might be used to accelerate aging, and which could be applied to reduce environmental impacts of newly installed copper pipe, were successfully tested. Chemical pretreatments using lime, caustic, soda ash or chlorine reduced copper release by as much as 84% compared to new pipes without pretreatment.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-01222001-143422en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-01222001-143422/en
dc.identifier.urihttp://hdl.handle.net/10919/31019en
dc.publisherVirginia Techen
dc.relation.haspartetd.pdfen
dc.relation.haspartetd2.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectsilicaen
dc.subjectcupric hydroxideen
dc.subjectpre-treatmenten
dc.subjectAgingen
dc.subjectsolubilityen
dc.subjectsorptionen
dc.titleAging and Copper Corrosion By-Product Release: Role of Common Anions, Impact of Silica and Chlorine, and Mitigating Release in New Pipeen
dc.typeThesisen
thesis.degree.disciplineEnvironmental Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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