Liquid and gas flow in the sewer network in the city of Perm

Abstract

The article describes the reasons for the formation of odors near the drainage system. The data on monitoring the section of the main unloading sewer in the city of Perm are presented. During the monitoring period, the samples of wastewater, atmospheric air quality have been taken, directly at the very point and at the border of the established sanitary protection zone (hereinafter referred to as the SPZ) or at the border of the nearest residential development (more than 30 m from the research point); in some points, the volume of the gas-air medium and the speed of gas movement in the sewer have been measured. Based on the studies carried out, the network parameters influencing the direction of gas movement have been determined. The calculation of the gaseous medium in the gravity reservoir under the influence of the entraining ability of the liquid and natural draft has been carried out. A gravity section has been taken for the calculation, located after the pressure head with the greatest length. Based on the results of the calculations, proposals are presented to change the direction of the gas-air medium, along with the direction of the wastewater flow.