Air Dispersion Modelling and Simulation in Aeration Tanks

Abstract

The necessary oxygen concentration for the biological process depends on the organic matter present in wastewater characterized by organic matter reaction rate with oxygen, k. This article highlights the impact of the reaction coefficient on oxygen dispersion in water. The first stage of the research led to the determination of the ratio between the coefficient of reaction and the coefficient of dispersion on the vertical of the tank as k/εz ϵ [0.066 -0.79]. Starting from this ratio, the specific oxygen flow required for the aeration process was determined to obtain a minimum oxygen concentration of 2 mg/L in the bottom zone of the tank: for k=3, specific gas flow qg=1.

Energy Optimization of Wastewater Cleaning Technologies

“…4 and fig. 5), consists of two reaction loops: the first is a loop of a standard system for regulating a linear process with a PID regulator; the second one is a nonlinear fuzzy supervisor system (Ionescu, 2015;Xiea C., 2016;Ionescu, 2017 Advantages: it can be applied to classic regulation schemes already implemented in practice; can be used in systems with fast dynamics; easy to design. Disadvantages: can only be applied if the PID controller can be designed.…”