Dynamic modeling of sludge compaction and consolidation processes in wastewater secondary settling tanks

A. Abusam, K.J. Keesman

Research output: Contribution to journalArticleAcademicpeer-review

11 Citations (Scopus)

Abstract

The double exponential settling model is the widely accepted model for wastewater secondary settling tanks. However, this model does not estimate accurately solids concentrations in the settler underflow stream, mainly because sludge compression and consolidation processes are not considered. In activated sludge systems, accurate estimation of the solids in the underflow stream will facilitate the calibration process and can lead to correct estimates of particularly kinetic parameters related to biomass growth. Using principles of compaction and consolidation, as in soil mechanics, a dynamic model of the sludge consolidation processes taking place in the secondary settling tanks is developed and incorporated to the commonly used double exponential settling model. The modified double exponential model is calibrated and validated using data obtained from a full-scale wastewater treatment plant. Good agreement between predicted and measured data confirmed the validity of the modified model
Original languageEnglish
Pages (from-to)51-56
JournalWater Environment Research
Volume81
Issue number1
DOIs
Publication statusPublished - 2009

Keywords

  • activated-sludge
  • sewage sludges
  • clarifier
  • plants

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