EFFECT OF THERMAL AND PHYSICAL PROPERTIES ON MASS AND HEAT EXCHANGE PROCESSES IN "AIR - WATER" SYSTEM AT BIOLOGICAL SEWAGE TREATMENT IN AIR TANKS
Temperature of initial sewage and storm water effluents and outside air effects on the biological sewage treatment. The basic trend of effect of temperature condition of structural work is the change of utilization factor of oxygen in the air. The temperature effect of waste water on the concentration of oxygen in air tanks leads to the change of activity of vital functions of microorganisms. The temperature increase beyond the bounds of physiological norms results in death of microorganisms, while decreasing the temperature causes just the decline of activity of microorganisms, and, consequently, to the less consumption of oxygen and treatment deterioration. Sharp fluctuations of the sewage temperature during twenty-four hours cause the decline of activity of microorganisms and require adaptation to the changing terms and conditions. At low temperatures the viscidity of water increases considerably. In winter, when the biological oxidation capacity falls, the air tanks have to work with larger amount of silt. In many instances, the chemical changes and physical and chemical reactions proceed with mass, heat exchange and hydromechanics processes [1, 2].