RU1789511C - Aerotank - Google Patents

Description

the volume of liquid transferred by the screw from one section of the aeration tank body to another with a nozzle for discharging liquid, and a screw, the shaft of which is mounted in the Segner wheel structure for rotation, and the body is rigidly connected to the bottom of the closed tank.

A distinctive feature of the proposed from the known aeration tanks is the presence of mixing devices with an activated sludge regenerator operating using pressure in the process pipeline.

In FIG. 1 shows aerial tank in plan; in FIG. 2 - section aa; in FIG. 3 - section BB.

The aeration tank includes a pipe 1 / supplying source wastewater from primary sumps, aeration tank corridor section 2, bells 3 on the supply pipe, located in the upper part of the corridor section with an outlet opening angled downward to increase the speed of downward and upward fluid flows in respective adjacent sections of the corridor. A slit hole 4 is located between the bottom of the aeration tank and the lower edge of the vertical partition and is designed to transfer fluid from the first section to the adjacent one. Above the second section 5 there are mixing devices displaced with an activated sludge regenerator, and a low pressure aeration piping system is also located. The pressure in the sludge conduit 6 is used to rotate the mixing paddles according to the Segner wheel principle, the valve 7 is designed to turn off the mixing device and to regulate the flow of sludge mixture. Through the hollow shaft 8 of the sludge mixture enters the cavity of the blades 9 of the mixer, placed on the shaft in the form of a Segner wheel. The screw shaft 10 is rigidly connected to the design of the blades, and its casing is mounted on the bottom of a closed tank. The upper part of the coupling 11 is rigidly connected to the pipe of the pressure pipe, and the lower part of the coupling is rotatable in the end portion of the hollow shaft. In the open circular tank 12, mixer blades and pipelines are located, as well as aerators for supplying air for the purpose of regenerating activated sludge.

Aerators 13 are made in the form of hole pipes with holes pointing downward, and located at a depth of 20-25 cm from the liquid level, a peripheral tray 14 for removing regenerated sludge from an open tank. Branch pipe 15 for the release of regenerated

sludge from the peripheral tray to the surface of the liquid in the first section of the corridor. The upper ends of the casing 16 of the screw are rigidly connected to the bottom of the closed tank. AT

the closed reservoir 17 by means of a screw, the liquid from the old section of the corridor is poured into the first section. Pipe 18, designed for overflow of liquid from a closed tank to the surface

liquids in the first section of the corridor, tubular aerators 19 are placed at a depth of 20-25 cm from the liquid level and have openings directed downward. Air duct 20 supplies air to the aerators from low pressure fans. The hole 21 is intended for the release of fluid to the secondary sumps or into the adjacent aeration tank corridor in case of the need for additional post-treatment, due to

With a high concentration of organic pollutants, Aerotank has a tray 22 for collecting purified liquid and a vertical partition 23.

Aerotank works as follows. The initial organic-containing wastewater after initial settling through pipeline 1 is sent to the first section 2 of the aeration tank corridor, in which

using the bells 3, located in the upper part of the section, are fed into the thickness of the processed fluid at an angle from top to bottom, helping to increase the speed of downward and upward flow of liquid in

adjacent sections x. The processed liquid flows with a given technological speed along the aeration tank corridor to the collecting tray 22, and part of the liquid under the pressure of the downward flow in the first

sections through the longitudinal slot hole .4 is transferred to the second section 5 of the aeration tank corridor. Through pressure pipe b, usually used on active aeration tanks for pumping active

sludge from the secondary settling tanks into the sludge regenerator through the valve 7, designed to turn off the mixing device and the regenerator, as well as to regulate the flow of the sludge mixture, is fed into the cavity of the shaft 8 of the blades of each device, which simultaneously regenerates the activated sludge and mixes it with the processed liquid at the help of the upward and downward flows generated during the overflow of fluid from one section to another by means of a screw, rigidly connected to the design of the blades, to provide free rotation of the shaft 8 common to the blades 9 and the screw 10, a coupling 11 is mounted rigidly attached to a branch from the pressure pipe.

The sludge mixture emerging from the cavities of the mixing blades accumulates in an open round tank 12, from which, after aeration, using low-pressure tubular aerators 13 with outlet holes directed downward, overflows into the tray 14 through a peripheral threshold, and then is discharged through the pipe 15 on the liquid surface of the first section of the aeration tank corridor.

When the screw is rotated using mixing blades, liquid from the second section penetrates into the cavity of the casing 16, by which it rises with screw-shaped blades into a closed reservoir 17 and then is discharged through the pipe 18 to the surface of the liquid in the first section.

Aeration of the liquid in the aeration tank is carried out through tubular aerators 19 installed at a depth of 20-25 cm from the level of the liquid being treated with the outlet openings directed downward, which allows them to be suppressed using low-pressure fans through the air duct 20.

Through the hole 21, the treated liquid is sent to the secondary settling tanks, and if necessary, the treatment of highly concentrated wastewater through the same hole is necessary, the liquid is transferred sequentially into the adjacent aeration tank corridor.

The mixing of the liquid with activated sludge in the proposed aeration tank is facilitated by the following factors:

technological flow of fluid at a given speed along the aeration tank corridor when it interacts with upward and downward flows, formed by supplying initial effluents to the upper part of the first section of the corridor, overflowing liquid from the second section into the first with the help of a screw and overflowing of regenerated sludge to the surface liquids in the first section;

the formation of vertical and horizontal flows and fluid at the entrance to the auger body;

the presence of a longitudinal vertical septum to its lower slit openings, providing the possibility of the fate of the entire mass of liquid in the formation of upward and downward flows.

The invention provides the following advantages:

a significant reduction in the cost of wastewater treatment by reducing the amount of electricity consumed, simplifying blower equipment and lowering operating costs;

the possibility of increasing the volume of air supplied for aeration, in case of increasing the concentration of pollution without shutting down the aeration tank;

increasing the oxidizing power of the aeration tank by intensifying the mixing of liquid with activated sludge.

Claims (2)

SUMMARY OF THE INVENTION 1. Aeration tank containing a corridor divided by a longitudinal vertical non-bottom septum into sections for receiving initial effluents and aeration of a liquid, a low-pressure aeration system, a system for mixing liquid with activated sludge, a circulating activated sludge supply and regeneration system, a screw with a drive in the form of Segner wheels and process pipelines, characterized in that, in order to reduce the cost of wastewater treatment by reducing the energy consumption for air supply, stirring liquids with activated sludge and its regeneration are made in the form of coaxially located, counting from top to bottom, an open round tank with peripheral trays and a nozzle for the release of sludge, closed round a tank with a fluid outlet pipe, a screw located in the casing, wherein the open tank is equipped with radially placed low-pressure aerators and rotating hollow blades, providing rotation of the screw, the shaft of which is rigidly connected to the shaft of the blades. 2. Aeration tank according to claim 1, characterized in that the screw casing is rigidly attached to the bottom of the closed tank. B-b Fig.