PRACTICAL RECOMMENDATIONS TO OXYGEN CALCULATIONMODES FOR BIOLOGICAL STRAIN WATER TREATMENTIN AEROTHENES WITH CLOSED AND REFERRING BIOECENOSIS
The most widely used biological methods of urban wastewater treatment, based on the use of the ability of microorganisms to oxidize organic pollution. The process of biological purification from pollutants occurs in aerotanks at direct contact of sewage with microorganisms of active sludge in the presence of an appropriate amount of dissolved oxygen. The effectiveness of removing contaminants in aerotanks can be greatly enhanced by the installation of additional loading (nets, nozzles, etc.), on the surface of which a biofilm with a high concentration of microorganisms is formed. In this case, the immobilized biocenose works simultaneously with the weighted volume of the building (active sludge). To organize an effective process of oxidation to aeration systems, it is necessary to provide such an oxygen regime in a reactor, in which the rate of biological purification should not be limited by the amount of oxygen contained in the reactor.
Examples of calculation of parameters of oxygen regime in aerotank-mixers with weighted and fixed biocenosis are given, an estimation of influence of various parameters is carried out. Considered the most expedient from a practical point of view technological scheme of wastewater treatment. The aerotank-mixer consists of two parts (reactor 1 and 2), while in the reactor 1, the removal of organic contaminants occurs due to weighted biocenosis (active sludge), that is, as in the usual aerotank-mixers, and in rector 2, the removal of organic contamination occurs at the expense of enshrined in the loading biocenose (biofilm).
The proposed method for calculating the oxygen regime in aerotank-mixers with fixed and weighted biocenosis. It is believed that the oxidation of pollution by an active sludge occurs in a zero-order reaction, and a biofilm is a reaction of the first order. The influence of limiting factors on concentration of dissolved oxygen and organic pollutants is estimated. The practical recommendations for its use are given, which allow to substantiate the most expedient mode of oxygen maintenance of biological purification processes in structures of advanced design and to evaluate the efficiency of application of additional loading with high concentrations of microorganisms on its surface.
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