Numerical modeling of water pollution by products of chemical reactions from the activities of industrial facilities at variable and constant temperatures of the environment

Abstract

The work focuses on the behavior of heated effluents discharged at elevated temperatures into the Ilek River, which is located in the city of Aktobe, Kazakhstan, as a result of industrial activities. This study is aimed at studying the dispersion characteristics of heated effluents in the near and far fields at different flow rates and dynamic conditions of the river. The chemical reaction, which is formed as a result of the combination of the ejected substance and the substance in water, is numerically investigated. The work took into account the variable temperature of the river, which changes during the day, and the values were compared with the results of modeling at a constant river temperature. It was found that, although the emitted element HNO₂ does not exceed the maximum permissible value (MPC), but the resulting products (HNO₃,HCl) exceed the MPC several times and cause significant damage to the aquatic environment.

Keywords: Chemical products; Chemical reaction; Pollutant dispersion; Reynolds averaged Navier-Stokes (RANS); Variable temperature of medium.