SU1143697A1 - Surface aerator - Google Patents

Abstract

SURFACE AERATOR, containing a rotor mounted on a vertical shaft, consisting of inner and outer conical bottom surfaces expanded from bottom to top and baffles arranged between them, forming channels, characterized in that, in order to increase the efficiency of aeration of aeration by increasing the aerator pumping effect, the degree of dispersion and mixing the water-air mixture, the lower parts of the partitions are located at an angle to the outer and inner surfaces of the channels, the lower part of the inner surface They are made spherical and with vertical slit-like openings separated from one another by splash breakers with a corrugated outer surface, while the aerator is provided with air-blowing blades radially located in the inner cavity of the rotor above the slit-like openings and perforated planes located in the lower part of the channels and coaxially cone-shaped) surfaces. 4 ОО OPi its m

Description

The invention relates to devices for aerating sewage during their bio-shmic treatment in aeration facilities and can be used in sewage treatment plants. A surface aerator is known that includes a rotor provided with channels formed by internal and external profiled circular walls divided by partitions, a casing made in the form of a truncated circular cone forming a closed annular cavity filled with a foam cooler with the external profiled wall. A disadvantage of the known aerator design is the low efficiency of aeration of a liquid with oxygen from the air, due to the insufficient contact time of the liquid discharged during rotation of the rotor with air, as well as the insufficient degree of dispersion of the liquid with air. In addition, the insufficient speed of the fluid in the construction volume is due to the imperfect design of the rotor channels for transporting and spraying the fluid. The purpose of the invention is to increase the efficiency of wastewater aeration by increasing the pumping effect of the aerator, the degree of dispersion and mixing of the water-air mixture. This goal is achieved by the fact that in the aerator, including a rotor mounted on a vertical shaft, consisting of inner and outer conical surfaces and bottom partitions arranged between them forming channels, the lower parts of the partitions are angled to the outer and inner surfaces the channels, not to the part of the inner surface are made spherical and with vertical slit-like openings separated from one another by spatter breakers with a corrugated outer surface, with an aerator providing the air blower blades radially located in the inner cavity of the rotor above the slit visible holes, as well as perforated planes placed in the lower part of the channels and coaxially cone-shaped surfaces. Figure 1 schematically shows the proposed aerator, longitudinal section; figure 2 - section aa in figure 1; on fig.Z - section BB in figure 1; Fig. 4 shows a fragment of the location of the perforated planes in the lower part of the aerator channels. The surface aerator comprises a vertical shaft 1 on which the inner and outer cone-shaped surfaces 1 and 2 are fixed, extending upwards. Between surfaces 2 and 3, partitions 4 are installed, with a lower edge 5 bent in rotation, which serves to intensify the process of drawing the water-air mixture and injecting it into channels 6 formed by surfaces 2 and 3 and partitions 4. The lower part of the inner surface 2 is made in the shape of sphere 7, which is provided with slots 8, separated from each other by splash breakers 9, the outer surface of which is made corrugated. In the inner cavity of the aerator, evenly along the circumference of the inner surface 2 above the slit 8, air-blowing blades 10 are installed. To intensify the dispersion process of the water-air mixture injected into the channels 6, as well as to mix the liquid particles with air bubbles in the lower part of the channels 6 between the partitions 4, they are installed parallel to each other other and surfaces 2 and 3 are perforated planes 11. Spray breakers 9 are designed to create during rotation of the aerator an ejecting effect on contact with They have a fluid flow, thereby improving the conditions for removing the injected blades 10 through the air slots 8, and the corrugated surface of the suction collectors 9 promotes the dispersion of air bubbles coming out of the slots 8 and mixing them with the liquid, which improves the conditions for the mass transfer of air oxygen into the aerated liquid. Surface aerator works as follows. When the aerator is rotated, the fluid is caught by the edges 5 of the partitions 4 bent in the direction of rotation and injected into channels 6 in which, due to the centripetal force arising during the rotation, moves up to the periphery of the rotor and is ejected above the surface of the liquid in the structure ;. The liquid touches the air when it is sprayed, and it is saturated with oxygen in the air. When the aerator rotates, its internal cavity is freed from the liquid due to the formation of a cavitation funnel, and the liquid goes through the slots 8 under the aerator to the edges 5. Simultaneously as the aerator rotates the blades 10, air is pumped through the slots 8 under the aerator to the intake edges 5, ( the slits 8 are intensified due to the ejecting effect of the fluid flow in contact with the rotation of the aerator with the splash breakers 9 separating the slits 8 from each other. When the slits 8 come out of the slits 8, air bubbles disperse the bl the corrugated outer surface of the spatter breakers 9 is simultaneously mixed with the liquid. Thus, a water-air mixture is formed under the aerator around the sphere 7, which is caught by the edges 5 of the partitions 4 and injected into the channels 6 parts of the channels 6. The dispersed water-air mixture is ejected by the aerator above the surface of the liquid into the structures, and the liquid is additionally saturated aets oxygen.

Due to the forced air supply, the blades 10 under the aerator, dispersing it by means of air blower-A

FIG. 2

9, dispersing and mixing the water-air mixture by the planes 11 in the channels 6, additional saturation of the liquid with oxygen in the air when the aerator is sprayed over the surface of the liquid in the building, the proposed design of the surface aerator improves the efficiency of aeration compared to the known

0 device. I

The edges 5 of the partitions 4 bent away in rotation of the aerator rotation intensify the process of drawing the water-air mixture and pumping

5 it through channels 6, thereby increasing the pumping effect of the aerator (the amount of fluid pumped by the aerator per unit of time) and, as a result, increases in speed.

The rate of fluid movement in the volume of the structure prevents the deposition of activated sludge and improves the hydrodynamic conditions in the structure. J

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Claims (1)

SURFACE AERATOR containing a rotor mounted on a vertical shaft, consisting of internal and external conical surfaces expanded from the bottom up and partitioned between them, forming channels, characterized in that, in order to increase the efficiency of aeration of wastewater by increasing the pumping effect of the aerator, the degree dispersing and mixing the water-air mixture, the lower parts of the partitions are located at an angle to the external and internal surfaces of the channels, the lower part of the inner surface it is spherical and with vertical slit-like openings, separated from each other by spray chippers with a corrugated outer surface, while the aerator is equipped with air-blades radially located in the inner cavity of the rotor above the slit-like openings, as well as perforated planes located in the lower part of the channels and coaxially conical surfaces. . Figure 1