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Occurrence of cyclo-siloxanes in wastewater treatment plants - quantification and monitoring

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dc.contributor.authorKulkarni, Harshad Vijay, author
dc.contributor.authorOmur-Ozbek, Pinar, advisor
dc.contributor.authorCarlson, Kenneth, committee member
dc.contributor.authorDooley, Gregory, committee member
dc.date.accessioned2007-01-03T08:34:07Z
dc.date.available2014-01-01T08:10:42Z
dc.date.issued2012
dc.description.abstractSiloxanes are persistent, bio-accumulative and toxic emerging contaminants introduced to wastewater from common healthcare and biomedical products, and various industrial processes. They remain unchanged through wastewater treatment and a considerable portion ends up in surface waters through effluent discharge. 30 to 60 ng/L Decamethylcyclopentasiloxane (D5) was detected in two UK Rivers, while ~400 ng/L of D5 may be found in wastewater effluents. Hence, siloxanes are under consideration by Canadian Environmental Assessment Agency and UK Environment Agency for drinking water regulations. Siloxanes are hydrophobic and also accumulate in activated sludge and biogas, causing mechanical problems due to scaling. This research aims: to quantify the siloxanes in sludge samples obtained from Loveland, CO wastewater treatment plant (WWTP); and to study their removal. A method was developed to effectively extract siloxanes from activated sludge samples using liquid extraction followed by quantification with gas chromatography/mass spectrometry. Results for Loveland Wastewater Treatment Plant samples indicated that Octamethylcyclotetrasiloxane (D4) and Decamethylcyclopentasiloxane D5 are present up to 17.11 µg/g dried-sludge. The effectiveness of H2O2 in siloxane removal was investigated. Sludge samples were spiked with D4 and D5 at 12 mg/g and were treated with 1ml, 3ml, and 5ml of 30% H2O2 for 1hr, 2hr, and 3hr reaction time each. Results indicated a 72% reduction in D4 and D5 levels after 3 hrs.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.identifierKULKARNI_colostate_0053N_11561.pdf
dc.identifierETDF2012400430CVEE
dc.identifier.urihttp://hdl.handle.net/10217/73667
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartof2000-2019
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subjectcogeneration
dc.subjectwastewater utilities
dc.subjectgas chromatography-mass spectrometry
dc.subjectcyclosiloxanes
dc.subjectbiogas
dc.titleOccurrence of cyclo-siloxanes in wastewater treatment plants - quantification and monitoring
dc.typeText
dcterms.embargo.expires2014-01-01
dcterms.embargo.terms2014-01-01
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
thesis.degree.disciplineCivil and Environmental Engineering
thesis.degree.grantorColorado State University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science (M.S.)

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