Authors O. I. Brikova, S. E. Dushin
Month, Year 05, 2018 @en
Index UDC 681.54
Abstract The existing models describing process of a biological sewage disposal do not consider influence of external factors, such as environment temperature, рН etc. The purpose of this article is to study the temperature effect of a surrounding medium on body height and development of bacteria in the course of nitrification and denitrification. Models of nitrification and denitrification are parts of the complete ASM1 model. In this article the non-linear mathematical models of a biochemical sewage disposal by the fissile ooze constructed on the basis of dynamic models of nitrification and denitrification taking into account temperature effect of a surrounding medium are offered. The conceptual models of nitrification and denitrification processes describing interrelation of components in mathematical model are given. As the influencing external factor change of environment temperature is considered. Development of biocenosis occurs in restricted space of the reactor at particular technological restrictions and assumptions. For the description of dependence of growth rate of microorganisms on temperature of the external environment the empirical equation of Vant Hoff is accepted. Solvable tasks consist in the analysis of temperature effect of the external environment on biological processes of nitrification and denitrification. On the basis of the developed mathematical models computer models in the environment of MATLAB/Simulink have been constructed. Results of studies in five various temperature schedules are presented. Change in a temperature schedule is carried out due to gradual increase and the subsequent decrease in environment temperature to the preset values. Families of schedules of transition phenomenons of various indexes at various temperature schedules are brought. Temperature schedules which create optimum conditions of bacteria biocenosis development are defined and provide the most efficient cleaning. The presented results of model operation confirm sensitivity of behavior of system to temperature changes and also need of maintaining of constant temperature for the bioreactor. The obtained results should be considered at creation of a multimode control system for the purpose of improvement in water quality indexes, decrease in time expenditure on biological cleaning and decrease terminating the cost of treatment facilities.

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Keywords Biological cleaning; the fissile ooze; nitrfikation; denitrifkation; mathematical model operations; temperature of the external environment; ASM models.
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