SIMULATION OF THE BIOLOGICAL PURIFICATION PROCESS IN AN AEROTANK MIXER

Abstract

In the process of biological wastewater treatment, organic impurities, as well as nitrogen and phosphorus compounds are extracted. The mathematical model of biological purification relates the initial and final concentrations of components, the dose of the main reagent – activated sludge, the duration of wastewater treatment, and the process rate. When designing aerotanks, the main parameter to be determined is the required duration of the process, since it is the very parameter, along with treated wastewater consumption, that the required reactor volume for process implementation is determined. Aims and Objectives: to consider the existing Monod and Herbert models for calculating the aeration tank mixer; to perform an analysis of aeration tank-mixer techniques without recirculation of activated sludge and determination of kinetic constants of activated sludge in a flow and periodic experiment; to obtain the results of the main parameters of the aeration tank-mixer: the dependence of pollution concentrations of initial and final concentrations of activated sludge on time in the form of a mathematical model. As a result of the research, it was found that according to Monod mathematical mode, stable operation of the aeration tank is observed in the area of small values of the output concentration of pollutants. One of the important properties of an ideal mixer is that the output coninput concentration value. Absolute stability in real conditions is most likely impossible, since the kinetics of pollution consumption does not follow the Monod model at all. The considered methods for determining kinetic constants are suitable only for relatively simple models of the dynamics of the growth of activated sludge.