USAGE OF AERATION-OXIDATIVE JET-LOOPED INSTALLATION FOR BIOLOGICALWASTEWATER TREATMENT

Abstract

Biological treatment of wastewater widely use pneumatic aeration systems, which provide sufficient concentrations of dissolved oxygen in the sludge mixture and its mixing. Reducing energy consumption of aeration remains an urgent problem. One of these methods is usage of hydromechanical aeration systems. It has known that such aeration systems have lower specific energy consumption compared to pneumatic systems. Nevertheless, hydromechanical aeration systems has limited volume performance. The simultaneous increasing of air solubility and lowering air suction in this system would increase its relative productivity.The purpose of the work is to find the design of an aerator-oxidizer and rational operation parameters to ensure the mild mixing and dissolution conditions of oxygen, in which there is no structural violation of active sludge.The operation of the aeration-oxidative jet-looped installation with various designs of oxidizer aerators and in various modes of operation using activated sludge and wastewater from the Bortnicheskaya aeration station was tested. The results of qualitative and quantitative analyzes of the active sludge before and after treatment in the installation (sludge index, microscopy) and the effect of wastewater treatment on the indicator of chemical oxygen consumption are presented. The parameters under which the activated sludge function in a satisfactory mode and the duration of this mode of operation are determined.Found that the usage of the second variant of the aeration-oxidative provides a mild mixing and aeration mode for the mixture, which does not lead to the destruction of active sludge and significant changes in its parameters. Shown a low efficiency of wastewater treatment, but a longer treatment resulted in undesirable destruction of active sludge floccules. The results of the research showed the research direction for most efficient design of the aerator-oxidizer, which will maximally reduce the above-mentioned negative phenomena and obtain high efficiency of sewage treatment by COD parameter.