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 language||English (US)|
|Number of pages||10|
|Journal||Journal of the Water Pollution Control Federation|
|State||Published - Jan 1 1984|
All Science Journal Classification (ASJC) codes