Estimating the hindered-settling flux function from a batch test in a cone

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Abstract

The hindered-settling velocity function for the modelling, simulation and control of secondary settling tanks can be determined from batch tests. The conventional method is to measure the velocity of the descending sludge-supernatant interface (sludge blanket) as the change in height over time in a vessel with constant cross-sectional area. Each such experiment provides one point on the flux curve since, under idealizing assumptions (monodisperse suspension, no wall-effects), the concentration of sludge remains constant just below the sludge blanket until some wave from the bottom reaches it. A newly developed method of estimation, based on the theory of nonlinear hyperbolic partial differential equations, is applied to both synthetic and experimental data. The method demonstrates that a substantial portion of the flux function may be estimated from a single batch test in a conical vessel. The new method takes into consideration that during an ideal settling experiment in a cone, the concentration just below the sludge blanket increases with time since the mass of suspended solids occupy a reduced volume over time.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • University of Concepción
  • University of Pretoria
  • Mälardalen University
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Kemiteknik
  • Matematik

Nyckelord

Originalspråkengelska
Sidor (från-till)244-253
Antal sidor10
TidskriftChemical Engineering Science
Volym192
Tidigt onlinedatum2018 jul 17
StatusPublished - 2018 dec 31
PublikationskategoriForskning
Peer review utfördJa