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dc.contributor.authorPark, Chulen_US
dc.date.accessioned2014-03-14T20:42:13Z
dc.date.available2014-03-14T20:42:13Z
dc.date.issued2002-07-23en_US
dc.identifier.otheretd-07302002-033607en_US
dc.identifier.urihttp://hdl.handle.net/10919/34253
dc.description.abstractThis research was designed to investigate the effect of cations on activated sludge characteristics and also to determine their influence on digestion performance. For this purpose, cations in solution and in floc were evaluated along with various activated sludge characteristics and the collected waste activated sludge underwent both anaerobic and aerobic digestion. It was found that large amounts of biopolymer (protein + polysaccharide) remained in the effluent of WWTP that received high influent sodium but had low iron and aluminum in floc. However, sludges from plants with high sodium and high iron and aluminum dewatered well and produced high quality effluents, suggesting that iron and aluminum have significant positive effects on floc properties. Following anaerobic digestion, a significant increase in solution protein occurred and correlations between solution protein, ammonium production, percentile volatile solids reduction and iron in floc were obtained. These data indicate that iron-linked protein is released to solution when iron is reduced and its degradation is responsible for volatile solids reduction in anaerobic digestion. In aerobic digestion, polysaccharide in solution increased along with calcium, magnesium and inorganic nitrogen. This implies that divalent cation-bound biopolymer might be the primary organic fraction that is degraded under aerobic digestion. Combined (anaerobic/aerobic) digestion was performed and produced further volatile solids destruction with discrete cation and biopolymer response during each phase of digestion. These results support the theory that two types of organic matter with different cation bindings are present in floc and each type is degraded under different digestion processes.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartthesis.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectactivated sludgeen_US
dc.subjectconditioningen_US
dc.subjectflocen_US
dc.subjectdewateringen_US
dc.subjectcationsen_US
dc.subjectironen_US
dc.subjectvolatile solids reductionen_US
dc.subjectaluminumen_US
dc.subjectproteinen_US
dc.subjectpolysaccharideen_US
dc.subjectaerobic digestionen_US
dc.subjectanaerobic digestionen_US
dc.titleCations and activated sludge floc structureen_US
dc.typeThesisen_US
dc.contributor.departmentEnvironmental Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineEnvironmental Planningen_US
dc.contributor.committeechairNovak, John T.en_US
dc.contributor.committeememberRandall, Clifford W.en_US
dc.contributor.committeememberLove, Nancy G.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07302002-033607/en_US
dc.date.sdate2002-07-30en_US
dc.date.rdate2003-08-01
dc.date.adate2002-08-01en_US


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