The emission of pollutants from wastewater disposal facilities has become a topic of increased interest, given its significant impact on the overall climate footprint of wastewater treatment plants. This paper presents comparative data in the field of air quality monitoring on the territory of domestic and industrial wastewater treatment plants abroad and in Russia. The issue of the influence of odors on human health is considered. Practical examples of the control of bad-smelling emissions are offered. A brief review of scientific papers on topics related to gaseous emissions from wastewater disposal systems is presented. Experimental studies of the quantities of specific components of the gas-air mixture above the surface of the waste liquid of the aeration tanks of the sewage treatment plants (CBS) of the city of Novoshakhtinsk, Rostov region are presented. Based on the analysis of the obtained results, technologies for reducing the amount of emissions from CBS facilities are considered.

Keywords: monitoring of air pollution, emissions, foul-smelling emissions, sulfur dioxide, aeration tank

The paper presents studies of the state of biologically active filtering material - vermicompost in the working area of ​​the aeration station at closed sewage treatment plants with an increased concentration of sulfur dioxide. The assessment of the filtering sorption properties was carried out using bioindication methods, namely, germination of test seeds under conditions of an increased content of sulfur dioxide. The bioindication method is considered fast and accurate, it allows to obtain reproducible results.Oat seeds, wheat seeds - representatives of monocotyledonous plants, as well as radish seeds - a dicotyledonous plant, were used as test seeds, as they are highly sensitive to harmful effects. The experiment took place in four stages with different time intervals. The indicator is the average length of development of the root system in the tested water compared to the control. The results showed that 60% of normal germination was recorded in monocotyledonous seeds, and 90% of normally germinated seeds were recorded in dicotyledons. According to the well-known method, the non-toxic properties of vermicompost was assessed based on the lengths of shoots and seed roots, which can be used as a load in installations for the biochemical purification of gases emitted into the air of the working area from closed wastewater treatment facilities. Such an installation can be a biofilter. Thus, the thickness of the load, the height of each of its constituent layers, affects the degree of its efficiency.

Keywords: sulfur dioxide, bioindication, closed treatment facilities, waste water, test seeds, germination of seeds, vermicompost