Rybachenko S. Aerobic fine treatment of wastewaters on the submerged filters

The thesis deals with developing the more sophisticated and reliable methods of calculation of parameters of the wastewater post-treatment (fine treatment) from organic matters with submerged filters using developed and implemented mathematical models, which are based on the existing ideas and the more complete consideration of the mechanisms and features of the process of wastewaters fine treatment. General model consists of the system of coupled equations developed relatively concentration changes of contaminants in influents. These equations describe the processes of transport (filtration) of contaminants in the filter (reactor), diffusion into the liquid film (boundary layer), internal diffusion and reaction in the biofilm. There were reviewed different kinetics of mass transfer and biological oxidation reactions, hydraulic parameters of environment, feature of biofilm formation, unsteady process and so on.Mathematical model was realized by numerical and analytical methods, on the base of which engineering method of calculation of the main technological and construction parameters of filters was developed. Recommendations about parameters and coefficients, which are included in the equations and in the developed ratio, were proposed. Valuation of the main factors and initial parameters of treatment was made. Developed methods of calculations were approved by results of laboratory research of the process of domestic wastewater treatment on the submerged filters as well as data research of other scientists. Developed recommendations were realized in the engineering practice.