Optimizing dewatering polymer usage and resulting percent cake solids at the Hornsby Bend Biosolids Management Plant

dc.contributor.advisorLawler, Desmond F.
dc.creatorGockowski, Mark Andrew
dc.creator.orcid0000-0002-3934-5298
dc.date.accessioned2018-02-07T21:04:01Z
dc.date.available2018-02-07T21:04:01Z
dc.date.created2017-12
dc.date.issued2017-12-08
dc.date.submittedDecember 2017
dc.date.updated2018-02-07T21:04:02Z
dc.description.abstractThe City of Austin (CoA) employs anaeraboic digestion at Hornsby Bend Biosolids Management Plant (HBBMP) to treat the sludge generated from upstream wastewater treatment. HBBMP applies a polymer solution to the digested sludge, and the conditioned sludge is then passed through a belt filter press for final dewatering. Recent data indicate that the final solids content of the sludge cake after dewatering (cake %TS) has fallen below CoA targets. The purpose of this research is to optimize the sludge conditioning process to maximize cake %TS, as well as evaluate potential impacts of upstream magnesium hydroxide addition on sludge volumes and final cake %TS. The polymer optimization investigation involves analysis of four measures of sludge dewaterability: specific resistance to filtration (SRF), capillary suction time (CST), specific CST and calculated cake %TS. SRF, CST, specific CST, and calculated cake %TS data are presented for sludges treated with different polymer solutions. The precipitates investigation involves analysis of upstream added magnesium hydroxide data. Theoretical calculations are presented to determine the maximum and minimum daily mass of precipitates formed and conveyed to HBBMP. These theoretical precipitate mass data are compared with historical data for total daily volume of sludge dewatered and total daily mass of dewatered sludge produced by the belt filter presses. The results of these investigations show that, at the bench scale, a BASF Zetag 8819 polymer solution containing 0.035-0.0525 mL raw polymer per 100 mL of sludge at 0.25%-0.4% concentration, aged for 10-30 minutes prior to application, will improve sludge dewaterability most and most consistently. Additionally, there was no evidence of a change in the volume of sludge processed or mass of sludge cake produced as a result of increased upstream magnesium hydroxide addition.
dc.description.departmentCivil, Architectural, and Environmental Engineering
dc.format.mimetypeapplication/pdf
dc.identifierdoi:10.15781/T2QF8K201
dc.identifier.urihttp://hdl.handle.net/2152/63563
dc.language.isoen
dc.subjectSludge
dc.subjectDewatering
dc.subjectPolymer
dc.subjectBelt filter press
dc.titleOptimizing dewatering polymer usage and resulting percent cake solids at the Hornsby Bend Biosolids Management Plant
dc.typeThesis
dc.type.materialtext
thesis.degree.departmentCivil, Architectural, and Environmental Engineering
thesis.degree.disciplineEnvironmental and Water Resources Engineering
thesis.degree.grantorThe University of Texas at Austin
thesis.degree.levelMasters
thesis.degree.nameMaster of Science in Engineering

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