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Analysis of octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane in wastewater, sludge and river samples by headspace gas chromatography/mass spectrometry

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dc.contributor.authorZhang, Yu, author
dc.contributor.authorÖmür-Özbek, Pinar, advisor
dc.contributor.authorCarlson, Kenneth, committee member
dc.contributor.authorDooley, Gregory, committee member
dc.date.accessioned2007-01-03T06:51:13Z
dc.date.available2015-09-30T06:30:24Z
dc.date.issued2014
dc.description.abstractSiloxanes are commonly used in cosmetic and personal care products, healthcare products and many industrial applications. Because siloxanes are persistent, they end up in the wastewater and go untreated through the wastewater treatment units, which lead to contamination of the surface waters through effluent discharge. Siloxanes tend to be adsorbed onto or absorbed by the activated sludge in the wastewater treatment process. In the digesters, the siloxanes volatilize and accumulate in the biogas, which leads to mechanical problems due to scaling. The two most common siloxanes detected in wastewaters and sludge are: octamethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5). For this study, the D4 and D5 in wastewater and sludge samples were monitored using headspace gas chromatography/mass spectrometry. Samples were collected from the City of Loveland Wastewater Treatment Plant (WWTP), Loveland, CO and the Drake Wastewater Reclamation Facilities (WWRF), Fort Collins, CO. The levels of D4 were in the range of 0.7-11.3 ng•mL-1 in wastewater and 0.3-1.8 µg•g-1 dry solid in the sludge from Drake WWRF; 1.0-6.7 ng•mL-1 in wastewater and 0.3-1.7 µg•g-1 dry solid in the sludge from Loveland WWTP. D5 levels were determined in the range of 0.4-10.4 ng•mL-1 in wastewater and 3.2-31.4 µg•g-1 dry solid in the sludge from Drake WWRF; 0.5-14.0 ng•mL-1 in wastewater and 2.5-18.9 µg•g-1 dry solid in the sludge from Loveland WWTP. The concentrations of D4 and D5 were higher in this study compared to other researches in other countries and the concentrations in waste activated sludge were in a comparable range. The concentrations of D4 and D5 in the receiving water body near the discharging points were below the limit of detection. The average mass loadings in the influent were 53.1 and 159.9 g•d-1 of D4 and 155.3 and 225.3 g•d-1 of D5 respectively in two plants.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.identifierZhang_colostate_0053N_12523.pdf
dc.identifier.urihttp://hdl.handle.net/10217/84580
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relationwwdl
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.subjectGCMS
dc.subjectheadspace
dc.subjectOctamethylcyclotetraxiloxane
dc.subjectwastewater
dc.subjectsludge
dc.subjectDecamethylcyclopentasiloxane
dc.titleAnalysis of octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane in wastewater, sludge and river samples by headspace gas chromatography/mass spectrometry
dc.typeText
dcterms.embargo.expires2015-09-30
dcterms.embargo.terms2015-09-30
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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