ASSESSMENT OF RELATIVE PRESSURE IN THE SEWAGE NETWORK COLLECTOR

Abstract

Sewage networks are one of the main and important urban communications. When sewage move through the collector, harmful gases are released through leaks in wells, penetrate into the residential area of the city and causes a negative impact on the human organism, and also causes chemical deformation of collector and related facilities. One of the gases is hydrogen sulfide, which belongs to the II hazard category. The object of this study is the gravity sewage pipeline of the city, located after the stilling basin, considered in the article as the most problematic, in terms of high concentrations of hydrogen sulfide in the subroof space. The research methods used include the analysis of literature on the topic under study, experimental studies on measuring temperature, atmospheric pressure, studies of the concentration of emitted gases over time in the current collector - collected and systematized data on the constructive characteristics of the collector. Instrumental data on atmospheric air temperature and industrial emissions, atmospheric pressure and pollutant concentrations in industrial emissions of control points of sewage facilities during different seasons of the year are presented. The purpose of the article is to obtain the data necessary for calculating the natural draft depression of the air-gas mixture in the reservoir. According to the results of calculations based on the data collected during the annual period, conclusions are drawn about the absence of natural draft in the drainage collector and the need for taking measures to organize artificial ventilation of the collector, as well as calculating the depression created by the captivating ability of the fluid.