Calibration of a compressive gravity thickening model from a single batch settling curve

K. F. Cacossa, D. A. Vaccari

Research output: Contribution to journalConference articlepeer-review

18 Scopus citations

Abstract

A compressive gravity thickening model was calibrated from a single batch settling curve. This model was originally formulated in terms of the total suspended solids concentration, C, the dynamic pressure gradient, ?P/?z, and the gradient corresponding to the compressive yield strength, ?σ(y)/?z. Fitch demonstrated that the model could be formulated in terms of C and the solids concentration gradient, ?C/?z. Utilizing this formulation the model was calibrated with data generated from elementary quantitative analysis of the steady-state conditions attained in continuous thickening experiments. In this investigation the model was calibrated from a single batch settling curve. This was done using the down-hill simplex optimization method proposed by Nelder and Mead in a curve-fitting capacity. The optimization routine adjusted the model coefficients in order to reduce the discrepancy between the simulated results of the model and the corresponding experimental batch settling data. When calibrated by this method the model was found to accurately predict experimental continuous thickening behavior observed for the same sludge.

Original languageEnglish
Pages (from-to)107-116
Number of pages10
JournalWater Science and Technology
Volume30
Issue number8 pt 8
DOIs
StatePublished - 1994
EventProceedings of the 17th Biennial Conference of the International Association on Water Quality. Part 8 - Budapest, Hung
Duration: 24 Jul 199430 Jul 1994

Keywords

  • Activated sludge
  • Batch
  • Calibration
  • Compression
  • Modeling
  • Sedimentation
  • Simulation
  • Thickening

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