Modeling the competition between floc-forming and filamentous bacteria in activated sludge waste water treatment systems II. A prototype mathematicalmodel based on kinetic selection and filamentous backbone theory

In this paper a prototype mathematical model is introduced which describes the growth of Aocs and filaments in activated sludge waste water treatment systems. The model is based on both kinetic selection and filamentous backb one theory. A stability analysis of the model is performed and it is shown that this model, in contrast with mathematical models only based on kinetic selection theory, is able to describe coexistence of both Aocs and filamen ts for a wide range of dilution rates. Afterwards the model is extended in order to describe a standard activated sludge waste water treatment system. (C) 2000 Elsevier Science Ltd. All rights reserved.