Biochemical sludge accelerated high-efficiency precipitation device

Abstract

The utility model provides a biochemical sludge accelerated high-efficiency sedimentation device. The device comprises a high-efficiency sedimentation tank, the efficient sedimentation tank is sequentially provided with a mixing area, a flocculation area and a pre-sedimentation area, an inclined tube sedimentation area and a sludge concentration area are arranged behind the pre-sedimentation area, and the inclined tube sedimentation area is located above the sludge concentration area; and a biochemical sludge pipe and a sludge return pipe are connected above the mixing area. Biochemical activated sludge is combined with a general efficient sedimentation process, and the sedimentation effect of a general efficient sedimentation tank is enhanced by utilizing the good flocculation, adsorption and sedimentation capacity of the activated sludge.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment, and particularly relates to a device for accelerating and efficiently precipitating biochemical sludge. Background Technique

[0002] The high-efficiency sedimentation tank process relies on various theories such as sludge coagulation, circulation, inclined tube separation, and concentration. It is the third-generation sedimentation process that integrates the functions of mud-water separation and sludge concentration, and mainly realizes the function of further removing suspended solids and total phosphorus. The high-efficiency sedimentation tank consists of a reaction zone and a clarification zone. The reaction zone includes a mixing zone and a flocculation zone; the clarification zone includes an inlet pre-sedimentation zone, an inclined tube sedimentation zone, and a concentration zone. In the mixing zone, the rapid coagulation reaction of sludge, medicament, and raw water is completed by the lifting and mixing action of the agitator, and then it is lifted to the flocculation zone by the impeller for slow flocculation reaction to form larger flocs. A large number of high-density and homogeneous alum flowers can be obtained in the entire reaction zone (mixing and flocculation zones). The high-density alum flowers enable the sludge to have a faster sedimentation speed in the sedimentation zone without affecting the effluent quality.

[0003] At present, high-efficiency sedimentation tanks are widely used in the advanced treatment of sewage treatment plants and the pretreatment of industrial wastewater. The most crucial point of the high-efficiency sedimentation tank is the sludge circulation and sludge discharge function. In the sludge circulation, part of the sludge returns from the concentration zone to the inlet of the reaction zone, and the sludge circulation rate is precisely controlled to maintain a high sludge concentration in the reaction zone to improve the flocculation ability of the influent sludge and make the flocs more uniform and dense. In the actual use process, the influent of the high-efficiency sedimentation tank is mostly low-turbidity and slightly polluted water. It is difficult to achieve high-density and homogeneous alum flowers in the reaction zone only by adding flocculants. Often, the flocs are too light and appear with the water flow, and the treatment effect fails to meet the expectations. The prior art often uses media such as adding fine sand and magnetic powder as a kind of crystal nucleus to induce the formation of flocs together with the returned sludge, promote the rapid growth of floc particles, increase the density, and increase the sedimentation speed. However, this method of adding external media, firstly, increases a large amount of equipment investment (such as sand adding equipment or magnetic recovery machines, etc.), secondly, increases the media cost, and thirdly, the increased equipment also increases the energy consumption. Content of the Utility Model

[0004] The purpose of this application is to solve the problems that general media-free high-efficiency sedimentation tanks are prone to mud running and have poor sedimentation effects under the condition of low-turbidity influent, and at the same time improve the problems of many devices, high equipment maintenance costs, and high chemical agent costs in the sand addition sedimentation and magnetic coagulation sedimentation processes.

[0005] Biochemical activated sludge forms a common microbial system with zoogloea and filamentous bacteria. Filamentous bacteria serve as the framework of the sludge flocs, and zoogloea adheres to their surface, forming sludge flocs with a compact structure and good sedimentation performance. Good zoogloea is conducive to the activated sludge performing flocculation, adsorption, and precipitation functions. This application combines biochemical activated sludge with a general high-efficiency sedimentation process to enhance the sedimentation effect of a general high-efficiency sedimentation tank by utilizing the good flocculation, adsorption, and precipitation ability of the activated sludge.

[0006] This application provides a device for accelerating high-efficiency sedimentation of biochemical sludge, including a high-efficiency sedimentation tank; the high-efficiency sedimentation tank is successively provided with a mixing zone, a flocculation zone, and a pre-sedimentation zone, and a inclined tube sedimentation zone and a sludge thickening zone are arranged behind the pre-sedimentation zone, and the inclined tube sedimentation zone is located above the sludge thickening zone; a biochemical sludge pipe and a sludge return pipe are connected above the mixing zone.

[0007] A sewage inlet is arranged at the lower left of the high-efficiency sedimentation tank, and a partition wall 1 is arranged between the sewage inlet and the mixing zone. There is a gap between the top of the partition wall 1 and the top of the high-efficiency sedimentation tank to facilitate the sewage to flow into the mixing zone.

[0008] The interfaces of the biochemical sludge pipe and the sludge return pipe with the high-efficiency sedimentation tank are located at the upper left of the mixing zone and on the right side of the partition wall 1.

[0009] A coagulant dosing pipe and a rapid mixer are connected above the mixing zone.

[0010] A partition wall 2 is arranged between the mixing zone and the flocculation zone, and a water passing hole is opened at the bottom of the partition wall 2.

[0011] A coagulant aid dosing pipe and a slow mixer are connected above the flocculation zone.

[0012] A rectifying wall is arranged between the flocculation zone and the pre-sedimentation zone, and a water passing hole is opened at the bottom of the rectifying wall; a partition wall 3 is arranged behind the pre-sedimentation zone, and the materials in the pre-sedimentation zone enter the inclined tube sedimentation zone or the sludge thickening zone through the partition wall 3; the top of the partition wall 3 is an inclined surface, and the side close to the pre-sedimentation zone is the highest.

[0013] A treated water outlet is arranged at the upper right of the inclined tube sedimentation zone.

[0014] A sludge level gauge is arranged above the sludge thickening zone, and a sludge pipeline is connected to the bottom. The sludge pipeline includes a sludge return pipe and a surplus sludge discharge pipe.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. The sedimentation and separation effect is good. By enhancing the coagulation and shallow sedimentation effects of a general high-efficiency sedimentation tank through the flocculation, adsorption, and precipitation ability of biochemical activated sludge, the separation of mud and water is realized more thoroughly, the suspended solids and total phosphorus in the effluent are greatly reduced, and the effluent quality is significantly improved.

[0017] 2. The biochemical sludge has a stable source and is easily obtainable. Generally, a biochemical treatment section is provided in a sewage treatment plant, and the biochemical sludge is easily obtainable and can be added at any time.

[0018] 3. The dosage and addition time of the biochemical sludge can be adjusted at any time, showing applicability.

[0019] 4. After the sludge in the high-efficiency sedimentation tank is replenished to the required concentration, the addition can be stopped, and the operation is convenient. Description of the Drawings

[0020] Figure 1 Schematic diagram of the device of the present utility model.

[0021] Figure 2 Process flow diagram of the present utility model.

[0022] Explanation of the labels in the figure: 1. High-efficiency sedimentation tank, 2. Mixing zone, 3. Flocculation zone, 4. Pre-sedimentation zone, 5. Inclined tube sedimentation zone, 6. Sludge thickening zone, 7. Quick mixer, 8. Slow mixer, 9. Sludge level gauge, 10. Coagulant aid dosing pipe, 11. Coagulant dosing pipe, 12. Biochemical sludge reflux pump, 13. Biochemical sludge flowmeter, 14. Biochemical sludge control valve, 15. Biochemical sludge pipe, 16. Sludge reflux pipe, 17. Return sludge pump, 18. Surplus sludge pump, 19. Surplus sludge discharge pipe, 20. Sewage inlet, 21. Treated water outlet, 22. Partition wall 1, 23. Partition wall 2, 24. Rectifying wall, 25. Partition wall 3. Detailed Embodiment

[0023] The following will describe the implementation scheme of the present utility model in detail in combination with embodiments. The following embodiments are only used to illustrate the present utility model and should not be regarded as limiting the scope of the present utility model.

[0024] Embodiment 1

[0025] The present application provides a biochemical sludge accelerated high-efficiency sedimentation device, including a high-efficiency sedimentation tank 1; the high-efficiency sedimentation tank 1 is successively provided with a mixing zone 2, a flocculation zone 3, and a pre-sedimentation zone 4. A slant tube sedimentation zone 5 and a sludge thickening zone 6 are provided behind the pre-sedimentation zone 4, and the slant tube sedimentation zone 5 is located above the sludge thickening zone 6; the biochemical sludge pipe 15 and the sludge reflux pipe 16 are connected above the mixing zone 2.

[0026] The sewage inlet 20 is provided at the lower left of the high-efficiency sedimentation tank 1. A partition wall 1 22 is provided between the sewage inlet 20 and the mixing zone 2. There is a gap between the top of the partition wall 1 22 and the top of the high-efficiency sedimentation tank 1 to facilitate the sewage to flow into the mixing zone 2.

[0027] The interfaces of the biochemical sludge pipe 15 and the sludge reflux pipe 16 with the high-efficiency sedimentation tank 1 are located at the upper left of the mixing zone 2 and on the right side of the partition wall 1 22.

[0028] Above the mixing zone 2, a coagulant dosing pipe 11 and a rapid mixer 7 are connected.

[0029] A partition wall two 23 is provided between the mixing zone 2 and the flocculation zone 3, and a water passing hole is opened at the bottom of the partition wall two 23.

[0030] Above the flocculation zone 3, a coagulant aid dosing pipe 10 and a slow mixer 8 are connected. The coagulant aid dosing pipe 10 is located at the front end of the flocculation zone 3.

[0031] The coagulant aid dosing pipe 10 can also be installed at the end of the mixing zone 2.

[0032] A flow rectifying wall 24 is provided between the flocculation zone 3 and the pre-sedimentation zone 4, and a water passing hole is opened at the bottom of the flow rectifying wall 24; a partition wall three 25 is provided behind the pre-sedimentation zone 4, and the materials in the pre-sedimentation zone 4 enter the inclined tube sedimentation zone 5 or the sludge thickening zone 6 through the partition wall three 25; the top of the partition wall three 25 is an inclined surface, and the side close to the pre-sedimentation zone 4 is the highest.

[0033] A treated water outlet 21 is provided at the upper right of the inclined tube sedimentation zone 5.

[0034] A sludge level gauge 9 is provided above the sludge thickening zone 6, and the bottom is connected to a sludge pipeline. The sludge pipeline includes a sludge return pipe 16 and a surplus sludge discharge pipe 19.

[0035] Example 2

[0036] The working process of the device described in Example 1 is as follows:

[0037] (1) Sewage enters the mixing zone 2 through the sewage inlet 20 above the partition wall one 22 and is mixed with the sludge from the biochemical sludge well or the sludge return pipe 16 in the mixing zone 2.

[0038] (2) In the mixing zone 2, a coagulant such as aluminum salt or iron salt is added through the coagulant dosing pipe 11 and rapidly mixed under the action of the rapid mixer 7. The mixed materials enter the flocculation zone 3 from below the partition wall two 23.

[0039] (3) A coagulant aid PAM is added through the coagulant aid dosing pipe 10 at the end of the mixing zone 2 or the front end of the flocculation zone 3 and rapidly mixed under the action of the slow mixer 8.

[0040] (4) The uniformly mixed water flows from the lower part of the flow rectifying wall 24 to the pre-sedimentation zone 4 for pre-sedimentation.

[0041] (5) After flowing out of the pre-sedimentation zone 4, the easily precipitated flocs fall into the sludge thickening zone 6, and the flocs that are not easy to precipitate and those that have not had time to precipitate enter the inclined tube sedimentation zone 5 for precipitation. The treated clear water flows out from the treated water outlet 21 at the upper part of the inclined tube sedimentation zone 5, and the sludge falls to the sludge thickening zone 6.

[0042] (6) A portion of the settled sludge is circulated to the mixing zone 2 through the sludge return pipe 16. By precisely controlling the sludge circulation rate, a high sludge concentration in the reaction zone is maintained to improve the flocculation ability of the influent sludge, making the flocs more uniform and dense.

[0043] (7) The sludge level meter 9 monitors the sludge level height. When the sludge level in the sludge thickening zone 6 rises to a certain height, the excess sludge is discharged through the sludge discharge system to prevent the inclined tubes from being blocked. The excess sludge is discharged into the sludge storage tank through the excess sludge discharge pipe 19.

[0044] In step (1), the raw sludge can be added continuously or intermittently according to the requirements of the sedimentation effect.

[0045] In steps (2) and (3), the dosage of aluminum salt and iron salt is Al 3+ (Fe 3+ ) / ΔP = 1.5 - 3 (molar ratio), where ΔP is the total phosphorus removal amount, and the dosage of anionic PAM is 0.4 - 1 mg / L. The actual dosage is determined according to bench-scale tests and adjusted according to different water volumes and water qualities.

[0046] In step (6), the reflux ratio of the sum of the reflux sludge and the biochemical sludge dosage to the influent water volume is controlled at 5% - 10%.

[0047] The biochemical sludge in this application can not only be taken from the sludge in the biochemical sludge well, but also from the mixed liquid of mud and water in the aerobic zone of the activated sludge process biochemical system.

Claims

1. A biochemical sludge accelerated high-efficiency sedimentation device, characterized in that: The invention comprises a high-efficiency sedimentation tank (1); the high-efficiency sedimentation tank (1) is provided with a mixing zone (2), a flocculation zone (3), and a pre-sedimentation zone (4) in sequence; an inclined tube sedimentation zone (5) and a sludge concentration zone (6) are provided behind the pre-sedimentation zone (4); the inclined tube sedimentation zone (5) is located above the sludge concentration zone (6); a biochemical sludge pipe (15) and a sludge return pipe (16) are connected above the mixing zone (2).

2. The biochemical sludge accelerated high-efficiency sedimentation device according to claim 1, characterized in that: A sewage inlet (20) is provided at the lower left of the high-efficiency sedimentation tank (1), and a partition wall (22) is provided between the sewage inlet (20) and the mixing zone (2). A gap is left between the top of the partition wall (22) and the top of the high-efficiency sedimentation tank (1) to facilitate sewage to flow into the mixing zone (2).

3. The biochemical sludge accelerated efficient sedimentation device according to claim 1, characterized in that: The interface between the biochemical sludge pipe (15) and the sludge return pipe (16) and the high-efficiency sedimentation tank (1) is located at the upper left of the mixing zone (2) and on the right side of the partition wall 1 (22).

4. The biochemical sludge accelerated efficient sedimentation device according to claim 1, characterized in that: A coagulant dosing pipe (11) and a rapid mixer (7) are connected above the mixing zone (2).

5. The biochemical sludge accelerated efficient sedimentation device according to claim 1, characterized in that: A second partition wall (23) is provided between the mixing zone (2) and the flocculation zone (3), and a water hole is provided at the bottom of the second partition wall (23).

6. The biochemical sludge accelerated efficient sedimentation device according to claim 1, characterized in that: The flocculation zone (3) is connected above with a coagulant dosing pipe (10) and a slow-speed mixer (8).

7. The biochemical sludge accelerated efficient sedimentation device according to claim 1, characterized in that: A rectifying wall (24) is arranged between the flocculation zone (3) and the pre-sedimentation zone (4), and a water through hole is provided at the bottom of the rectifying wall (24); a partition wall (25) is arranged behind the pre-sedimentation zone (4), and the material in the pre-sedimentation zone (4) enters the inclined tube sedimentation zone (5) or the sludge concentration zone (6) through the partition wall (25); the top of the partition wall (25) is an inclined surface, and the highest point is on the side close to the pre-sedimentation zone (4).

8. The biochemical sludge accelerated efficient sedimentation device according to claim 1, characterized in that: A treated water outlet (21) is provided at the upper right side of the inclined tube sedimentation area (5).

9. The biochemical sludge accelerated efficient sedimentation device according to claim 1, characterized in that: A mud level meter (9) is provided above the sludge concentration zone (6), and a sludge pipeline is connected to the bottom thereof. The sludge pipeline comprises a sludge return pipe (16) and a residual sludge discharge pipe (19).

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