Modeling and Simulation of Municipal Wastewater Treatment Plants by Activated Sludge

Abstract A dedicated software has been developped for the dynamic simulation of a municipal wastewater treatment plant by activated sludge. The primary settler, the aeration tank of canal-type with air injection and the secondary settler are modelled. The biological reaction takes into account the solubility and the biodegradability of the pollution and the sensitivity of the biomass to oxygen. The software results are compared to the response of a full-size plant and of a pilot plant to time-dependent perturbations in flowratc and load, related to human activity and weather conditions.