Ways to ensure environmental standards when harmful gaseous substances are released into the atmosphere from drainage networks based on modeling their operation

National Research Moscow State University of Civil Engineering, Moscow, Russia

^* Corresponding author: OrlovVA@mgsu.ru

Abstract

The issues of physical and mathematical modeling of the operation of a pressure-free drainage pipeline made of polymer material and ceramics are studied in order to prevent negative environmental consequences when harmful and toxic gases are released into the atmosphere of cities from the drainage network. Studies of the dynamics of changes in hydraulic and aerodynamic parameters during the flow of liquid and gas in the subsurface space of a ceramic pipeline are presented. An algorithm for solving the problem based on the calculation of hydrodynamic similarity criteria describing the phenomena of mass transfer as a result of forced air convection by using a mechanical ventilation system of aggressive airborne droplet mass over a water surface is compiled. Based on the results of the operation of a special automated calculation program, the total mass of harmful gases released from the water into the subsurface space of the pipeline, the time of removal of hydrogen sulfide entering the subsurface space in concentrations significantly exceeding their maximum permissible values in the city atmosphere, as well as the time of removal of gaseous substances depending on the filling of water in the gravity pipeline are determined.