Modeling Predation Processes in Activated Sludge

Ni, Bing-Jie, Rittmann, Bruce E. and Yu, Han-Qing (2010) Modeling Predation Processes in Activated Sludge. Biotechnology and Bioengineering, 105 6: 1021-1030. doi:10.1002/bit.22632

Author Ni, Bing-Jie
Rittmann, Bruce E.
Yu, Han-Qing
Title Modeling Predation Processes in Activated Sludge
Journal name Biotechnology and Bioengineering   Check publisher's open access policy
ISSN 0006-3592
Publication date 2010-04
Sub-type Article (original research)
DOI 10.1002/bit.22632
Volume 105
Issue 6
Start page 1021
End page 1030
Total pages 10
Place of publication Hoboken, NJ United States
Publisher John Wiley and Sons
Language eng
Formatted abstract
Predation by protozoa plays an important role in activated sludge. In this work, the kinetics for protozoan predation of active bacteria (XH), extracellular polymeric substances (EPS), and intracellular storage products (XSTO) are added into a previously expanded unified model that describes the dynamics of EPS, XSTO, and soluble microbial products (SMP). The new biomass growth - decay - predation model describes the biomass fractions, soluble organic components, and oxygen-uptake rates considering EPS, XSTO, and predators during dynamic operating conditions in activated sludge. Model calibration using batch experimental data provides the new parameter values for predation processes and insights into mechanisms involving predators. The calibrated value of the maximum specific growth rate for the predators is much slower than for the bacteria, confirming that predators are relatively slow growers. However, the predators and bacteria have similar decay rates and dissolved oxygen affinities. Model testing with results independent of the calibration data shows two things. First, the model and calibrated parameters accurately simulate the independent results when predators are present. Second, eliminating predation by high salinity significantly lowers the OUR, and this is captured by the model.
Keyword Activated sludge
Batch experiments
Expanded unified model
Model development and calibration
Predation processes
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Advanced Water Management Centre Publications
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Citation counts: TR Web of Science Citation Count  Cited 12 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 14 times in Scopus Article | Citations
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