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Optimization of the activated sludge anoxic reactor configuration as a means to control nutrient removal kinetically

Authors
Journal
Water Research
0043-1354
Publisher
Elsevier
Publication Date
Volume
41
Issue
8
Identifiers
DOI: 10.1016/j.watres.2007.01.007
Keywords
  • Activated Sludge
  • Denitrification
  • Kinetics
  • Optimization
  • Biodegradable Organic Substrates
  • Oxygen Inhibition
  • Anoxic Reactor Configuration
  • Staging
Disciplines
  • Design

Abstract

Abstract Factors influencing the determination of optimum reactor configuration for activated sludge denitrification are investigated in this paper. A kinetic optimization method is presented to evaluate optimal pre- and post-denitrification bioreactor stages. Applying the method developed, simulation studies were carried out to investigate the impacts of the ratio of the influent readily biodegradable and slowly biodegradable substrates and the oxygen entering the denitrification zones on the optimal anoxic reactor configuration. In addition, the paper describes the effects of the slowly biodegradable substrate on the denitrification efficiency using external substrate dosing, and it demonstrates kinetic considerations concerning the hydrolysis process. It has been shown that as a function of the biodegradable substrate composition, the stage system design with three optimized reactor compartments can effectively increase reaction rates in the denitrification zones, and can provide flexibility for varying operation conditions.

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