Changes in Dewatering Properties Between the Thermophilic and Mesophilic Stages in TPAD Systems

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dc.contributor.authorBivins, Jason Leeen
dc.contributor.committeechairNovak, John T.en
dc.contributor.committeememberLove, Nancy G.en
dc.contributor.committeememberRandall, Clifford W.en
dc.contributor.departmentEnvironmental Engineeringen
dc.date.accessioned2014-03-14T20:50:14Zen
dc.date.adate2000-12-18en
dc.date.available2014-03-14T20:50:14Zen
dc.date.issued2000-11-27en
dc.date.rdate2001-12-18en
dc.date.sdate2000-12-18en
dc.description.abstractTemperature-phased anaerobic digestion (TPAD) has become increasingly appealing in recent years due to the pathogen destruction capabilities of the system. However, there has also been concern about the dewatering properties of the sludges created by these systems. A laboratory study was conducted at Virginia Tech to determine the effect of thermophilic solids retention time (SRT) on sludge dewatering properties, to characterize system parameters associated with dewatering, and to understand the mechanisms causing changes in dewatering properties between the thermophilic and mesophilic phases. The study showed that while anaerobic digestion caused dewatering properties to deteriorate, sludges varied little with thermophilic SRT. Acidogenesis was essentially complete after 1.5 days. Subsequent mesophilic digestion resulted in little change to dewatering properties and modest reductions in conditioning doses, but substantial reductions in biopolymer (protein + polysaccharides) occurred. It appears that thermophilic anaerobic digestion creates or releases colloidal materials that cause dewatering to be poor and subsequent mesophilic digestion for 15 days does little to improve sludge properties of TPAD systems.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-12182000-114810en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-12182000-114810/en
dc.identifier.urihttp://hdl.handle.net/10919/36254en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartThesis(PDF).pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectconditioningen
dc.subjectbiopolymeren
dc.subjectdewateringen
dc.subjectdigestionen
dc.subjectanaerobicen
dc.subjectmesophilicen
dc.subjectthermophilicen
dc.titleChanges in Dewatering Properties Between the Thermophilic and Mesophilic Stages in TPAD Systemsen
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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