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Bacterial extracellular polymers and flocculation of activated sludges

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dc.contributor.authorKajornatiyudh, Sittipornen
dc.contributor.committeechairNovak, O.T.en
dc.contributor.committeememberRandall, Clifford W.en
dc.contributor.committeememberHoehn, Robert C.en
dc.contributor.committeememberKnocke, William R.en
dc.contributor.committeememberBenoit, Robert E.en
dc.contributor.departmentEnvironmental Science and Engineeringen
dc.date.accessioned2015-05-14T16:36:14Zen
dc.date.available2015-05-14T16:36:14Zen
dc.date.issued1986en
dc.description.abstractThe extracellular polymers produced by bacteria play an important role in bacterial aggregation or bacterial flocculation in secondary waste treatment. The mechanisms responsible for this floc formation are thought to be polymer induced adsorption and interparticle bridging among bacterial cells or between bacterial cells and inorganic colloids. The efficiency of the processes following flocculation in the treatment line such as sedimentation, sludge thickening, and sludge dewatering depends on the extent of this bacterial flocculation. In this research, sludge samples from under various substrate conditions were examined for type, molecular weight, physical characteristics„ and quantity of extracellular polymers so that the general characteristics of the various polymers could be established. An attempt was made to determine if a relationship exists between the state of bacterial aggregation and the polymer characteristics. This research also investigated the sludge physical properties. The effect of various parameters such as pH, divalent cation (mixture and concentration), and mixing (period and intensity) on dewatering properties were studied. A major goal of this study was to develop a flocculation model for activated sludge. This model could be used to determine if plants can increase the efficiency of waste treatment and sludge thickening and sludge dewatering processes.en
dc.description.degreePh. D.en
dc.format.extentxiii, 171 leavesen
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttp://hdl.handle.net/10919/52313en
dc.language.isoen_USen
dc.publisherVirginia Polytechnic Institute and State Universityen
dc.relation.isformatofOCLC# 13912570en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1986.K346en
dc.subject.lcshSewage -- Purification -- Activated sludge processen
dc.subject.lcshSewage -- Purification -- Flocculationen
dc.subject.lcshBiopolymers -- Analysisen
dc.titleBacterial extracellular polymers and flocculation of activated sludgesen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineEnvironmental Science and Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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