SU1245557A1 - Installation for flotobiological purification of waste water - Google Patents

Description

2. Installation pop, 1, characterized in that the visor is located in the upper part of the partition and is inclined towards the aeration chamber,

and the reflector is inclined towards the flotation chamber and is located below the lower edge of the fender shield.

3. Installation of PP, 1 and 2, that is, that the chute for the inlet of waste water is installed in the middle of the flotation chamber above the perforation.

The invention relates to devices for the treatment of industrial and domestic wastewater and is intended for the biological treatment of highly concentrated foaming wastewater, mainly wastewater of pig breeding complexes and farms, by aerobic methods.

The purpose of the invention is to increase the cleaning efficiency by reducing the foaming capacity of waste water before it is introduced into the aeration tank and to prevent spontaneous reduction of the activated sludge dose in the aeration tank.

Figure 1 is a schematic diagram of the installation; figure 2 - section aa in figure 1; figure 3 is a view of the BB in figure 2.

The installation contains a flotation cell 1 (pressure or mechanical), connected by pipeline 2 to the receiving tank 3, after which the pump 4 with an air ejector and pressure tank 5 connected by pipelines 6 and 7, respectively, are located. Pipeline 2 communicates with the aeration tank 8 via pipe 9. Behind the aeration tank 8, there is a secondary settling tank 10 (flotation cell, clarifier) and pump station 11 of circulating activated sludge reported by pipelines 12 and 13. A wall 14 is installed across the inlet side of the aero tank 8 (figure 2 ) with a reflector 13 and a visor 16, dividing the aeration tank 8 into the flotation chamber 17 and the aeration chamber 18 (the aeration tank itself).

The distribution pipe is above the overflow edge of the visor, and the chute for circulating activated sludge inlet is installed in the inlet of the aeration chamber. It is flush with the overflow edge of the visor.

4. Installation according to PP, 1-3, about tl and - ducting. due to the fact that it is equipped with a pipeline of excess activated sludge, connecting the pumping station of the circulating activated sludge and the receiving tank.

In the flotation chamber 17 parallel to the partition 14 is placed a fencing shield 19, the lower edge of which is located below the top 20 of the partition 14, and

the upper edge is higher than the overflow edge of the visor 16. In this case, the reflector 15 is bent toward the flotation chamber, and the visor 16 toward the aeration chamber. Above the flotation chamber 17 (above

overflow edge of the visor 16) is located overflow chute 21 for inlet of primary flotation wastewater connected to pipeline 9. Parallel to the bottom of the flotation chamber

The chute 21 is provided with a perforated pipe 22 for the intake of a water / air mixture, which is connected to a pressure tank 5 by a pipe 23, and pneumatic aerators 24.

The foam collector 25 is attached to the end wall of the aerotank 8 on the outer side (FIG. 3), which is equipped with a pipe 26 for removing the foam. Under chute 21 there is a foam removal device.

27. In a possible embodiment, the foam container 25 may be attached to the side wall of the aerotank 8. In this case, the foam removal device 27 is not placed across the flotation chamber 17, but along. Above the aeration chamber 18 at the level of the overflow edge of the drain 16 there is installed an overflow channel 28 (FIGS. 2 and 3) for the inlet of the circulating activated sludge, connected by a pipe 29 with the pumping station 11 of the circulating activated sludge. In the preferred embodiment

3

The receiving tank 3 can be equipped with a pipeline 30 of excess activated sludge, which provides the tank 3 with the pumping station 11..

The installation works as follows.

Sewage water that has passed the primary treatment in primary sedimentation tanks enters the flotation cell 1, where it is cleaned of suspended solids and reduced foaming capacity due to the partial removal of frothers with primary water saturation with air oxygen. The flotation cell 1 may be based on the plant capacity and the properties of the treated liquid, both pressure and mechanical. The primary treated water is further divided into two streams, one of which flows through conduit 2 to the receiving reservoir 3, and the other via pipeline 9 to the overflow chute 21 located above the aerotank flotation chamber 17 8. Water from the reservoir 3 (Fig. 1) taken by pump 4, which also sucks air through the ejector. The impeller of the pump 4 disperses the air, forming a homogeneous water-air mixture. In the case of supplying surplus activated sludge to the receiving tank 3 via conduit 30, pump 4 mixes act sludge with water, crushes sludge sludge and leads to the formation of an airborne sludge mixture.

Secondly (after the flotation device 1), the waste water is saturated with air from the pressure tank 5, where it is briefly held under pressure, through the pressure pipe 23 enters the perforated pipe 22 (figure 2) and, out of its openings, is uniform. but it is distributed over the entire living section of the flotation chamber 17. Since the pipe 22 is located at a depth of 4-5 m, air bubbles, floating up, partially dissolve in water, which increases the utilization rate of injected air by another 10-15% and improves the oxygen regime in the water before it enters the aeration chamber 18. At the same time, the air bubbles formed after the removal of pressure float the contaminants in the water and lead to its secondary foaming with the release of frothers into the foam layer.

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The supply of excess activated sludge to the receiving tank 3 improves the secondary flotation process due to biosorption. The second stream, which entered 5 overflow chute 21 through conduit 9, pours out of it and falls from the height of 0.8-1.0 m into the aerotank 8 flotation chamber 17. Falling jets of water, capturing the air, improve the processes

10 aeration and foaming and increase turbulence in the flotation chamber 17, which contributes to a more complete removal of suspended solids and stripping of gases formed as a result of 5 anaerobic processes proceeding. in the waste water at the stage of machining. The flotation, aeration and foaming processes can be intensified by pneumatic

20 by aeration with the help of aerators 24 located on both sides of the pipe 22. Separated with foam removal. the device 27 (.З) is scooped into the foam collector 25 and out of the installation through the pipeline 26. The baffle shield 19 prevents foam from entering the aeration chamber 18. .

The secondary clarified water, passing under the shield 19, rises along the partition 14 and pours across the entire width of the visor 16 into the aeration chamber 18 (the reflector 15 prevents the raw water from passing through the pipe 22 under the shield 19). Since the visor 16 has

sloping downstream, the water does not flow down the outer surface of the partition 14, but falls freely, which allows it to trap air with both surfaces. Circulating active-.

the sludge taken by the pumping station 11 from the secondary settling tank 10, via pipeline 29 enters the overflow trough 28 located in the immediate vicinity of the overflow

the edges of the visor 16. Due to this proximity, the flow of circulating activated sludge adheres to the water flow when dropped, which ensures their quick and effective mixing in

thin layer with simultaneous intensive aeration of the mixture. Further, the mixture, after being treated in the aeration chamber aeration chamber 19, passes through the pipeline 1 2 to the secondary settling tank 10. The clarified water is fed to the after-treatment or decontamination, and the divided active sludge flows through the pipeline 13 to the pump station 11.

The use of the plant makes it possible to prepare wastewater for the aerobic method of biochemical treatment at the stage of mechanical cleaning by repeated aeration with simultaneous removal of suspended substances and frothers from it. A decrease in the concentration of foaming agents prevents the formation of foam in aerotanks, where a significant portion of the activated sludge is currently being floated. Thus, the use of the proposed

5 allows to increase the cleaning efficiency by reducing the load on the activated sludge and increasing its dose ya 0.4-0.8 g / l as compared with the known installation during cleaning

10 wastewater pig farms.

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Claims (4)

1. INSTALLATION FOR FLOTOBIOLOGICAL SEWAGE TREATMENT, comprising a flotator, a receiving tank, an air ejector pump, a pressure tank, an aeration tank equipped with a perforated distribution pipe placed horizontally across the aeration tank on its bottom and connected to the pressure tank, and overflow gutters for and circulating activated sludge located parallel to the perforated pipe in the upper part of the aeration tank, a secondary sump, a pumping station of circulating activated sludge and pipes connecting them wires, characterized in that, in order to increase the cleaning efficiency by reducing the foaming ability of water and preventing a decrease in the dose of activated sludge in the aeration chamber, the aeration tank is equipped with a blank partition with a reflector and a visor attached to it, dividing it into the flotation and aeration chambers, a breaker shield and a foam-collecting device with a foam collector, while the baffle plate is installed inside the flotation chamber parallel to the partition, and the foam collector is attached to the wall of the flotation chamber from the outside, one hundred inlet chutes -water is located above the flotation chamber above penosemnogo device and chute inlet circulating activated sludge aeration chamber located above. 2. Installation according to claim 1, characterized in that the visor is located in the upper part of the partition and is tilted towards the aeration chamber, and the reflector is tilted towards the flotation chamber and located below the lower edge of the baffle plate. 3. Installation according to claims 1 and 2, characterized in that the wastewater inlet chute is installed in the middle of the flotation chamber above the perforated distribution pipe above the overflow edge of the visor, and the circulating activated sludge inlet chute is installed at the inlet of the aeration chamber at the same level as overflow edge of a peak. 4. The installation according to claims 1 to 3, which is characterized in that it is provided with a pipeline of excess activated sludge connecting the pumping station of circulating activated sludge and a receiving tank.