Review article

This paper examines and analyzes the process of wastewater flow degassing in vertical shafts with transverseoverlaps, through which a stepwise flow drop occurs. Forthis purpose, modeling was performed in the ANSYSsoftware using the standard k -ε turbulence model and the Euler method for multiphase flows, which made it possibleto simulate the operation of the shaft and determinethe parameters of hydrogen sulfide emission basing onthe results of the numerical experiment. In addition,a laboratory experiment was performed to evaluate theeffect of the shaft design on the hydrogen sulfide emissionprocess using a 1:60 scale physical model. According tothe experimental results, the mass transfer coefficient of hydrogen sulfide in a vertical shaft with a stepwise flow drop ranges from 0,06×10-7 to 25,31×10-7 mg/s. The data obtained can have practical application in the development of methods for preventing emissions of harmful gases in wastewater disposal systems.