Effect of Solids Retention Time on Activated Sludge Properties and Effluent Quality

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dc.contributor.authorPhillips, Gary Pelhamen
dc.contributor.committeechairNovak, John T.en
dc.contributor.committeememberBoardman, Gregory D.en
dc.contributor.committeememberRandall, Clifford W.en
dc.contributor.departmentEnvironmental Engineeringen
dc.date.accessioned2014-03-14T21:52:59Zen
dc.date.adate1998-09-09en
dc.date.available2014-03-14T21:52:59Zen
dc.date.issued1998-08-26en
dc.date.rdate1999-09-09en
dc.date.sdate1998-08-26en
dc.description.abstractThe effect of solids retention time (SRT) or sludge age on activated sludge properties and effluent quality was investigated using laboratory scale reactors. It was found that an increase in SRT resulted in an increase in effluent solution polysaccharide, with the < 3,000 daltons (3K) size fraction contributing up to 68 percent of solution polysaccharides. The feed consisted of low molecular weight, readily degradable protein, suggesting that the observed increases in protein and polysaccharide were due to increased release of exocellular microbial product (EMP). The increase in solution protein and polysaccharide resulted in an increase in effluent chemical oxygen demand (COD). The increase in effluent COD was not accompanied by a similar increase in effluent biological oxygen demand (BOD), indicating that the EMPs released were resistant to biodegradation. At the highest SRT, the resistance to shear decreased and the capillary suction time (CST) increased. Following an initial increase, the sludge volume index (SVI) decreased at higher SRT.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-8998-12279en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-8998-12279/en
dc.identifier.urihttp://hdl.handle.net/10919/46517en
dc.publisherVirginia Techen
dc.relation.haspartthes_gpp.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectSolids retention timeen
dc.subjectactivated sludgeen
dc.subjecteffluenten
dc.subjectCODen
dc.subjectBODen
dc.subjectproteinen
dc.subjectpolysaccharideen
dc.subjectbiopolymeren
dc.subjectexocellular microbial producten
dc.subjectsettlingen
dc.titleEffect of Solids Retention Time on Activated Sludge Properties and Effluent Qualityen
dc.typeThesisen
thesis.degree.disciplineEnvironmental Planningen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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