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Characterising sedimentation velocity of primary waste water solids and effluents.
Abood, Kareem; Das, Tanmoy; Lester, Daniel R; Usher, Shane P; Stickland, Anthony D; Rees, Catherine; Eshtiaghi, Nicky; Batstone, Damien J.
Afiliación
  • Abood K; Australian Centre for Water and Environmental Biotechnology, The University of Queensland, St. Lucia, Brisbane, 4072, Queensland, Australia. Electronic address: K.Abood@uq.net.au.
  • Das T; School of Engineering, RMIT University, 124 La Trobe St., Carlton, Melbourne, 3000, Victoria, Australia; Department of Chemical Engineering, The University of Melbourne, Victoria 3010, Australia. Electronic address: s3696708@student.rmit.edu.au.
  • Lester DR; School of Engineering, RMIT University, 124 La Trobe St., Carlton, Melbourne, 3000, Victoria, Australia. Electronic address: daniel.lester@rmit.edu.au.
  • Usher SP; ARC Centre of Excellence for Enabling Eco-Efficient Beneficiation of Minerals, Department of Chemical Engineering, The University of Melbourne, Grattan St, Parkville, Melbourne, 3010, Victoria, Australia. Electronic address: spusher@unimelb.edu.au.
  • Stickland AD; ARC Centre of Excellence for Enabling Eco-Efficient Beneficiation of Minerals, Department of Chemical Engineering, The University of Melbourne, Grattan St, Parkville, Melbourne, 3010, Victoria, Australia. Electronic address: stad@unimelb.edu.au.
  • Rees C; Melbourne Water Corporation, 990 La Trobe St., Docklands, Melbourne, 3008, Victoria, Australia. Electronic address: catherine.rees@melbournewater.com.au.
  • Eshtiaghi N; School of Engineering, RMIT University, 124 La Trobe St., Carlton, Melbourne, 3000, Victoria, Australia. Electronic address: nicky.eshtiaghi@rmit.edu.au.
  • Batstone DJ; Australian Centre for Water and Environmental Biotechnology, The University of Queensland, St. Lucia, Brisbane, 4072, Queensland, Australia. Electronic address: d.batstone@uq.edu.au.
Water Res ; 219: 118555, 2022 Jul 01.
Article en En | MEDLINE | ID: mdl-35561619
Sedimentation in waste water is a heavily studied topic, but mainly focused on hindered and compression settling in secondary sludge, a largely monodispersed solids, where bulk sedimentation velocity is effectively described by functions such as double Vesilind (Takacs). However, many waste water solids, including primary sludge and anaerobic digester effluent are polydispersed, for which application of velocity functions is not well understood. These systems are also subject to large concentration gradients, and poor availability of settling velocity functions has limited design and computational fluid dynamic (CFD) analysis of these units. In this work, we assess the use of various sedimentation functions in single and multi-dimensional domains, comparing model results against multiple batch settling tests at a range of high and low concentrations. Both solids concentration and sludge bed height (interface) over time are measured and compared. The method incorporates uncertainty analysis using Monte Carlo regression, DIRECT (dividing rectangles), and Newton optimisation. It was identified that a double Vesilind (Takacs) model was most effective in the dilute regime (<1%v/v), but could not effectively fit high solids concentrations (>1%v/v) without a substantial (50%) decrease in effective maximum sedimentation velocity (V0). Other parameters (Rh, Rp) did not change. A power law velocity model (Diehl) was significantly less predictive at low concentrations, and not significantly better at higher concentrations. The optimised model (with reduction in V0) was tested vs a standard (optimised) double Vesilind velocity model in a simple primary sedimentation unit, and resulted in deviation from -12% to +18% in solids capture prediction from underload to overload (washout) conditions, indicating that the effect is important in CFD based analysis of these systems.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Aguas del Alcantarillado / Aguas Residuales Tipo de estudio: Health_economic_evaluation / Prognostic_studies Idioma: En Revista: Water Res Año: 2022 Tipo del documento: Article Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Aguas del Alcantarillado / Aguas Residuales Tipo de estudio: Health_economic_evaluation / Prognostic_studies Idioma: En Revista: Water Res Año: 2022 Tipo del documento: Article Pais de publicación: Reino Unido