Abstract
The conventional activated sludge process has been in use for many years for treating wastewater. In this paper a non-structured pseudo-homogeneous model was developed to describe the process. Volume changes as well as the external resistance between the forming flocs and substrate were considered in the model. The kinetic model together with the values of parameters were obtained from the literature. A retention time of 12 hr was found to give over 95% removal of the substrate from the wastewater. Floc diameter, retention time, fraction of biomass recycled, substrate and biomass feed concentration were found to be important factors in the overall efficiency of the treatment process.
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