Review article

Currently, there exists a problem of hydrogen sulfide emission in wastewater disposal systems. The most intense emission is observed in pressure and non-pressure flow coupling structures - pressure damping chambers (PDC). As a result of the anaerobic respiration of bacteria, there is generated a large amount of sewer gases, including hydrogen sulfide, which is intensively released as a result of falling into the PDC. in this paper, it is proposed to eliminate the occurrence of anaerobic conditions by creating air ejection nodes at the pressure pipelines of sewer systems. On the base of using ANSYS CFx program, there has been developed a pipeline model with a diaphragm having an air tube connection. The results of modeling the volume fraction of a two-phase flow show the high efficiency of the proposed method. Due to the intake of air, it is possible to obtain a water-air mixture with oxygen content in the water stream equal to 78.7 mg / l, which will ensure aerobic conditions, slow down or completely eliminate the process of generating of sewer gases and releasing into the PDC.