The competitive growth of floc-forming and filamentous bacteria: A model for activated sludge bulking

A. O. Lau, P. F. Strom, D. Jenkins

Research output: Contribution to journalArticle

55 Scopus citations

Abstract

A mathematical model was developed to describe the observed relationship between dissolved oxygen concentration, organic loading, and activated sludge bulking at low DO concentrations. The objective of this research was to model filamentous activated sludge bulking to explain the observed relationships between organic loading and DO concentrations required to prevent bulking. The model incorporated diffusion and utilization of both a carbonaceous substrate (glucose) and DO in a floc composed of a single strain of a floc-forming microorganism (Citrobacter sp.) and a single strain of a filamentous microorganism (S. natans). With independently determined coefficients, the model was used to predict the effect of a variety of parameters (glucose and DO concentrations in the bulk liquid, floc diameter and shape) on the growth rates of the two microorganisms. Cases in which the filamentous organism outgrew the floc former were analogous to bulking in an activated sludge system.

Original languageEnglish (US)
Pages (from-to)52-61
Number of pages10
JournalJournal of the Water Pollution Control Federation
Volume56
Issue number1
StatePublished - Jan 1 1984
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Pollution

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