The effect of chemical settling on the kinetics and design of activated sludge for tannery wastewaters

D. Orhon*, S. Sözen, E. Ubay Çokgör, E. Ates Genceli

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

25 Citations (Scopus)


The effect of chemical settling of tannery wastewaters on the kinetic behaviour and performance of activated sludge process is investigated on the basis of experimentally supported model evaluations. Experiments involved besidese conventional characterization, detailed COD fractionation and assessment of major kinetic and stoichiometric coefficients by means of respirometric measurements. A multi-component model based on the endogenous decay concept was used for the kinetic interpretation and design of activated sludge. Results indicated that chemical settling as a pretreatment step induced a totally different kinetic pattern, significantly improving the biological treatability of tannery wastewaters. Design implications were evaluated in terms of major parameters of practical importance, such as effluent quality, activated sludge composition, aeration volume, oxygen demand and sludge generation.

Original languageEnglish
Pages (from-to)355-362
Number of pages8
JournalWater Science and Technology
Issue number4-5 -5 pt 4
Publication statusPublished - 1998
EventProceedings of the 1998 19th Biennial Conference of the International Association on Water Quality. Part 1 (of 9) - Vancouver, Can
Duration: 21 Jun 199826 Jun 1998


  • Characterization
  • Chemical settling
  • COD fractionation
  • Endogenous decay model
  • Process kinetics
  • Tannery wastewaters


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