Sewage treatment tank

Abstract

The utility model discloses a sewage treatment tank which comprises a biological treatment tank, a biological area is arranged in the biological treatment tank, a solid-liquid separation area is arranged above the biological area, a net pipe filler is arranged in the solid-liquid separation area, a baffle is arranged at the junction of the solid-liquid separation area and the biological area, and the baffle is connected with the inner wall of the biological treatment tank. By arranging the net pipe filler, on one hand, sludge fixation is facilitated, and strains are also attached to the upper part of the biological treatment tank; the situation that in the biological treatment pond, strains exist on the lower portion and do not exist on the upper portion is prevented, and then the space utilization rate of the aerobic pond is increased. And on the other hand, as the sludge is fixed on the net pipe filler, the loss amount of the sludge is reduced, the biomass in the tank is increased, and the stability of the system is enhanced. And the loss amount of the sludge is reduced, so that the load capacity of the secondary sedimentation tank in the sewage treatment system is reduced, the occupied area of the secondary sedimentation tank can be further reduced, and the construction cost is saved.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment, in particular to a sewage treatment tank. Background Art

[0002] In the biological treatment process of sewage, in the aerobic tank, protein nitrogen and organic nitrogen in the sewage are converted into ammonia nitrogen by ammonifying bacteria under aerobic conditions, which is ammonification; under the action of nitrobacteria, it is continuously converted into nitrate nitrogen, which is nitrification; at the same time, part of the organic matter is decomposed and consumed. The effluent enters the secondary sedimentation tank for natural sedimentation and solid-liquid separation. However, in the treatment process, there are technical problems such as large load in the aerobic tank, easy loss of bacterial strains; fewer colonies at the upper end of the aerobic tank and insufficient space utilization; and large occupied space in the secondary sedimentation tank.

[0003] The anaerobic tank is mainly based on the action of anaerobic microorganisms, which can decompose organic substances in an oxygen-free environment. In the anaerobic tank, organic substances are first removed through hydrolysis, acidification and methanation processes, which improves the biodegradability of the sewage and is beneficial to subsequent aerobic treatment. The anaerobic environment is maintained inside the anaerobic tank, that is, there is no oxygen present, so that anaerobic bacteria can use organic substances for anaerobic respiration and decompose the organic substances into simpler substances. At present, most anaerobic reactors adopt the three-phase separator method, and too large rising speed may lead to problems such as mud running. Summary of the Utility Model

[0004] To overcome the above disadvantages, the purpose of the utility model is to provide a sewage treatment tank. By setting a solid-liquid separation area, the occupied area of the secondary sedimentation tank is reduced, the construction cost is saved, and the space utilization rate is increased.

[0005] To achieve the above purpose, the technical scheme adopted by the utility model is: a sewage treatment tank, including a biological treatment tank, the inside of the biological treatment tank includes a biological area, a solid-liquid separation area is arranged above the biological area, a network tube filler is arranged in the solid-liquid separation area, a baffle is arranged at the junction of the solid-liquid separation area and the biological area, and the baffle is connected to the inner wall of the biological treatment tank.

[0006] Through the setting of the network tube filler, on the one hand, it helps to fix the sludge, so that there are also bacterial strains attached to the upper part of the biological treatment tank. It prevents the situation that there are bacterial strains below but none above in the biological treatment tank, thereby increasing the space utilization rate of the aerobic tank. On the other hand, since the sludge is fixed on the network tube filler, the loss amount of the sludge is reduced, the biomass in the tank increases, which enhances the stability of the system. And because the loss amount of the sludge is reduced, the load of the secondary sedimentation tank in the sewage treatment system is reduced, and thus the occupied area of the secondary sedimentation tank can be reduced, saving the construction cost.

[0007] By providing a baffle plate, it is possible to prevent the sludge that has fallen off the network tube packing from being directly washed by the airflow in the aeration pipe to the water outlet and flowing out from the water outlet, thus avoiding the phenomenon of sludge leakage and further reducing the loss of sludge.

[0008] Furthermore, a guide plate is provided below the network tube packing. The guide plate is connected to the lower end of the fixed bed and is inclined towards the inner wall of the biological treatment tank.

[0009] Furthermore, the inclination angle of the guide plate is 30 to 60°.

[0010] Furthermore, the baffle plate is located below the guide plate. The upper surface of the baffle plate is inclined, and the inclination direction of the upper surface is opposite to that of the guide plate. The inclination angle of the upper surface is 30 to 60°.

[0011] Furthermore, the sewage treatment tank further includes an internal circulation pump. The internal circulation pump is connected to the biological area through a pipeline, and the sewage in the biological area is circulated and refluxed under the action of the circulation pump.

[0012] Furthermore, an aeration pipe with micropores is provided at the bottom of the biological treatment tank. The aeration pipe is connected to a blower located outside the biological treatment tank.

[0013] Furthermore, the network tube packing includes outer adsorption strips. A plurality of outer adsorption strips are provided, and a first gap is left between two adjacent outer adsorption strips. The plurality of outer adsorption strips are arranged circumferentially to form an outer circle.

[0014] Inner adsorption strips. A plurality of inner adsorption strips are provided, and a second gap is left between two adjacent inner adsorption strips. The plurality of inner adsorption strips are arranged circumferentially to form an inner circle.

[0015] The outer circle is sleeved on the inner circle. The inner adsorption strips and the outer adsorption strips are not arranged in parallel, and the inner adsorption strips and the outer adsorption strips are connected at their intersection points.

[0016] Furthermore, the network tube packing is of a columnar structure with a height range of 400 to 500 mm and an outer diameter range of 50 to 60 mm. Exemplarily, the height of the network tube packing is 400 mm, 410 mm, 420 mm, 430 mm, 440 mm, 450 mm, 460 mm, 470 mm, 480 mm, 490 mm, 500 mm, and the outer diameter is 50 mm, 52 mm, 54 mm, 55 mm, 56 mm, 58 mm, 60 mm.

[0017] Further, two adjacent outer adsorption strips are arranged in parallel to form the first gap, and the width of the first gap is 5.5 - 6.5 mm; two adjacent inner adsorption strips are arranged in parallel to form the second gap, and the width of the second gap is 5.5 - 6.5 mm. Exemplarily, the width of the first gap is 5.5 mm, 5.7 mm, 5.9 mm, 6.0 mm, 6.1 mm, 6.3 mm, 6.5 mm, and the width of the second gap is 5.5 mm, 5.7 mm, 5.9 mm, 6.0 mm, 6.1 mm, 6.3 mm, 6.5 mm.

[0018] Further, the inner adsorption strip is a cylinder, and the bottom diameter range of the inner adsorption strip is 2.0 - 2.4 mm; the outer adsorption strip is a cylinder, and the bottom diameter range of the outer adsorption strip is 2.0 - 2.4 mm. Exemplarily, the bottom diameter of the inner adsorption strip is 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm; the bottom diameter of the outer adsorption strip is 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm.

[0019] Further, the number of the inner adsorption strips is equal to that of the outer adsorption strips, and the number range of both is 10 - 20. Exemplarily, the number of the inner adsorption strips or the outer adsorption strips is 10, 12, 14, 15, 16, 18, 20.

[0020] The beneficial effects of the present utility model are as follows: In this application, the treatment tank can be used as an aerobic tank. By setting the solid-liquid separation area, the solid-liquid separation ability in the aerobic area is strengthened, the biological enrichment ability at this stage is enriched, and the volume load is enhanced. Adding network tube fillers in the solid-liquid separation area, on the one hand, helps to fix the sludge, so that the upper part of the biological treatment tank is also attached with bacteria. This prevents the situation where there are bacteria at the bottom but none at the top in the biological treatment tank, thereby increasing the space utilization rate of the aerobic tank. On the other hand, since the sludge is fixed on the network tube fillers, the loss of sludge is reduced, the biomass in the tank increases, which enhances the stability of the system. And because the loss of sludge is reduced, the load on the secondary sedimentation tank in the sewage treatment system is reduced, and thus the floor area of the secondary sedimentation tank can be reduced, saving construction costs.

[0021] The treatment tank can be used as an anaerobic tank. When used as an anaerobic tank, adding network tube fillers to the solid-liquid separation area is conducive to biological attachment, increases the space utilization rate, and at the same time prevents the occurrence of sludge running phenomenon. The effluent sludge is reduced, the volume of the secondary sedimentation tank can be reduced, and the floor area is decreased. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0024] Figure 1 The front view of the sewage treatment tank according to an embodiment of the present invention;

[0025] Figure 2 The front view of the network tube packing according to an embodiment of the present invention;

[0026] Figure 3 is Figure 2 a partial enlarged view of;

[0027] Figure 4 The top view of the network tube packing according to an embodiment of the present invention.

[0028] In the figure: 1. Biological treatment tank; 11. Sludge discharge port; 12. Water outlet; 2. Internal circulation pump; 3. Biological area; 4. Solid-liquid separation area; 5. Baffle; 51. Upper surface; 6. Aeration pipe; 7. Fixed bed; 8. Network tube packing; 81. Outer adsorption strip; 811. First gap; 812. Outer circle; 82. Inner adsorption strip; 821. Second gap; 822. Inner circle; 9. Guide plate. Detailed implementation manners

[0029] To make the above objects, features and advantages of the present invention more obvious and understandable, the following will give a detailed description of the specific implementation manners of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0030] In addition, the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after, unless otherwise specified.

[0031] See the attached Figure 1As shown in the figure, a sewage treatment tank in this embodiment includes a biological treatment tank 1. A sludge discharge port 11 is provided at the bottom of the biological treatment tank 1, and a water outlet 12 is provided at the top. The interior of the biological treatment tank 1 includes a biological area 3. A solid-liquid separation area 4 is provided above the biological area 3. A baffle 5 is provided at the junction of the solid-liquid separation area 4 and the biological area 3, and the baffle 5 is connected to the inner wall of the biological treatment tank 1.

[0032] In some embodiments, the sewage treatment tank further includes an internal circulation pump 2. The internal circulation pump 2 is connected to the biological area 3 through a pipeline. The sewage in the biological area 3 is circulated and refluxed under the action of the circulation pump 2, increasing the hydraulic load and facilitating the formation of granular sludge. And through the setting of the internal circulation pump 2, the dissolved oxygen, microorganisms, organic matter, and activated sludge in the biological area 3 are fully mixed, accelerating the oxidation and decomposition process of organic matter.

[0033] In some embodiments, an aeration pipe 6 with micropores is provided at the bottom of the biological treatment tank 1. The aeration pipe 6 is connected to a blower located outside the biological treatment tank 1 and is used to supply oxygen to the interior of the biological treatment tank 1, increasing the dissolved oxygen content in the water to ensure the reproduction of aerobic bacteria, thereby ensuring the efficiency of decomposing organic matter in the biological treatment tank 1.

[0034] In some embodiments, a fixed bed 7 is provided in the solid-liquid separation area 4. The fixed bed 7 is connected to the inner wall of the biological treatment tank 1. A network tube filler 8 is provided on the fixed bed 7. Through the setting of the network tube filler 8, on the one hand, it helps to fix the sludge, so that the upper part of the biological treatment tank 1 is also attached with bacteria, increasing the space utilization rate of the biological treatment tank. On the other hand, since the sludge is fixed on the network tube filler 8, the loss of sludge is reduced, increasing the biomass in the tank, which enhances the stability of the system. And because the loss of sludge is reduced, the load on the secondary sedimentation tank in the sewage treatment system is reduced, and thus the floor area of the secondary sedimentation tank can be reduced, saving construction costs.

[0035] In some embodiments, the network tube filler 8 is a hollow network structure, which is easy for aeration and sludge to fall back. The height range of the network tube filler 8 is 400 - 500 mm, and the outer diameter is 50 - 60 mm. Preferably, the height of the network tube filler 8 is 465 mm and the outer diameter is 55 mm. The network tube filler 8 is composed of multiple adsorption strips staggered with each other, with good stability, not easily deformed during long-term use, and a service life of up to 30 years.

[0036] In some embodiments, the adsorption strips include an inner adsorption strip 82 and an outer adsorption strip 81. There are multiple outer adsorption strips 81. Two adjacent outer adsorption strips 81 are arranged in parallel, and a first gap 811 is left between two adjacent outer adsorption strips 81. The multiple outer adsorption strips 81 are arranged circumferentially to form an outer circle 812. There are multiple inner adsorption strips 82. Two adjacent inner adsorption strips 82 are arranged in parallel, and a second gap 821 is left between two adjacent inner adsorption strips 82. The multiple inner adsorption strips 82 are arranged circumferentially to form an inner circle 822. The outer circle 812 is sleeved on the inner circle 822.

[0037] In some embodiments, the inner adsorption strip 82 and the outer adsorption strip 81 are not arranged in parallel and have intersection points. The inner adsorption strip 82 and the outer adsorption strip 81 intersect to form multiple quadrilaterals. At the intersection points of the two, the inner adsorption strip 82 and the outer adsorption strip 81 are connected to make the structure of the network tube filler 8 stable.

[0038] In some embodiments, the first gap 811 and the second gap 821 have the same width. The width of the first gap 811 is 5.5 - 6.5 mm, preferably 6.0 mm. The hollow holes formed by the inner adsorption strip 82 and the outer adsorption strip 81 are rhombus-shaped, which improves the porosity of the network tube filler 8 and is beneficial to the attachment and growth of aerobic bacteria.

[0039] In some embodiments, the inner adsorption strip 82 inclines in one direction in the vertical direction, and the inner adsorption strip 82 inclines in the other direction in the vertical direction. The inner adsorption strip 82 and the outer adsorption strip 81 have opposite inclination directions but the same inclination angle, forming a rhombus symmetrical in the vertical direction.

[0040] In some embodiments, the number of the inner adsorption strips 82 and the outer adsorption strips 81 is equal, and the number of strips ranges from 10 to 20. The adsorption strips are cylindrical. The bottom diameter range of the adsorption strips is 2.0 - 2.4 mm. Preferably, the number of both the inner adsorption strips 82 and the outer adsorption strips 81 is 16, and the bottom diameter is 2.2 mm. The network tube filler has a large specific surface area, providing more places for the growth and attachment of microorganisms, and the materials used are easy for microorganisms to attach. These microorganisms reproduce and accumulate on the network tubes to form a zoogloea. The layer of organic matter formed by the attachment of the zoogloea on the fixed bed carrier is called a "biofilm". The biofilm can effectively degrade the pollutants in the sewage to achieve the treatment purpose of reducing various pollutant indicators. These network tube fillers 8 have a huge surface area for the attachment and growth of microorganisms, thus also improving the treatment effect on sewage. And the microbial film growing on the surface of the network tube filler 8 is due to the fluidization and collision of the network tube filler 8.

[0041] In the art, the network tube fillers are divided into soft network tube fillers, plate-soft network tube fillers and elastic fillers. The soft network tube filler has a large specific surface area, up to 5000 m 2 / m 3, but its lifespan is short, only 1 - 3 years, and it needs to be replaced frequently. The plate soft network tube filler and the elastic network tube filler have a long lifespan, up to 5 - 10 years, but their surface areas are relatively small. The specific surface area of the semi - soft network tube filler is 25 - 150 m 2 / m 3 , and that of the elastic network tube filler is even less than 50 m 2 / m 3 . The network tube filler disclosed in this application has a specific surface area larger than that of the plate soft network tube filler and the elastic network tube filler, reaching 150 - 200 m 2 / m 3 , and has a longer lifespan, up to 20 - 30 years.

[0042] In some embodiments, it further includes a guide plate 9 arranged below the fixed bed 7. One end of the guide plate 9 is fixedly connected to the lower end of the fixed bed 7 and is connected to the side of the fixed bed 7 away from the inner wall of the biological treatment tank 1. The other end of the guide plate 9 is inclined towards the direction close to the inner wall of the biological treatment tank 1. The inclination angle of the guide plate 9 is 30 - 60°, and the inclination angle is the included angle between the guide plate 9 and the vertical direction. The sludge attached to the network tube filler 8 slides down along the surface of the guide plate 9 to the upper surface 51 of the baffle 5. The upper surface 51 of the baffle 5 is inclined, and the inclined direction is opposite to that of the guide plate 9. After the sludge slides from the guide plate 9 to the baffle 5, it slides along the upper surface 51 of the baffle 5 to the biological area 3, and the sludge continues to degrade the organic pollutants in the sewage. Through the arrangement of the guide plate 9 and the baffle 5, it is prevented that the sludge falling off from the network tube filler 8 is directly washed to the water outlet 12 by the air flow in the air diffuser pipe 6 and flows out from the water outlet 12, resulting in the phenomenon of sludge running away.

[0043] In this application, the treatment tank can be used as an aerobic tank. When used as an aerobic tank, the air diffuser pipe 6 is opened. Due to the setting of the solid - liquid separation area 4, the solid - liquid separation ability in the aerobic area is enhanced, and the biological enrichment ability at this stage is enriched. The volumetric load is enhanced. By adding the network tube filler 8 in the solid - liquid separation area 4, it is easy for bacteria to attach, enhancing the space utilization rate of the aerobic tank. The effluent sludge is reduced, the volume of the secondary sedimentation tank can be reduced, and the floor area can be decreased.

[0044] The treatment tank can be used as an anaerobic tank. When used as an anaerobic tank, the internal circulation pump 2 is opened to increase the internal reflux of sewage, increase the hydraulic load, and is beneficial to the formation of granular sludge. Adding the network tube filler 8 in the solid - liquid separation area 4 is easy for organisms to attach, increases the space utilization rate, and at the same time prevents the occurrence of the sludge running away phenomenon.

[0045] The above - mentioned embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it. It cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A sewage treatment pool, characterized in that: The biological treatment tank (1) comprises a biological zone (3) inside the biological treatment tank (1), a solid-liquid separation zone (4) is arranged above the biological zone (3), a mesh tube filler (8) is arranged in the solid-liquid separation zone (4), a baffle (5) is arranged at the junction of the solid-liquid separation zone (4) and the biological zone (3), and the baffle (5) is connected to the inner wall of the biological treatment tank (1); The mesh tube filler (8) comprises an outer adsorption strip (81), wherein a plurality of the outer adsorption strips (81) are provided, a first gap (811) is left between two adjacent outer adsorption strips (81), and the plurality of the outer adsorption strips (81) are arranged circumferentially to form an outer circle (812); and further comprises an inner adsorption strip (82), wherein a plurality of the inner adsorption strips (82) are provided, a second gap (821) is left between two adjacent inner adsorption strips (82), and the plurality of the inner adsorption strips (82) are arranged circumferentially to form an inner circle (822); the outer circle (812) is sleeved on the inner circle (822), the inner adsorption strips (82) and the outer adsorption strips (81) are not arranged in parallel, and the inner adsorption strips (82) and the outer adsorption strips (81) are connected at the intersection of the inner adsorption strips (82) and the outer adsorption strips (81).

2. The sewage treatment tank according to claim 1, characterized in that: A guide plate (9) is provided below the mesh tube filler (8); the guide plate (9) is connected to the lower end of the fixed bed (7) and is inclined toward the inner wall of the biological treatment tank (1).

3. The sewage treatment pool according to claim 2, characterized in that: The inclination angle of the guide plate (9) is 30-60°.

4. The sewage treatment tank according to claim 3, characterized in that: The baffle plate (5) is located below the guide plate (9); the upper surface (51) of the baffle plate (5) is arranged to be inclined, and the inclination direction of the upper surface (51) is opposite to the inclination direction of the guide plate (9).

5. The sewage treatment tank according to claim 1, characterized in that: The sewage treatment pool also includes an internal circulation pump (2), the internal circulation pump (2) being connected to the biological zone (3) via a pipeline, and the sewage in the biological zone (3) is circulated and refluxed under the action of the circulation pump.

6. The sewage treatment tank according to claim 1, characterized in that: An aeration pipe (6) with micropores is arranged at the bottom of the biological treatment tank (1), and the aeration pipe (6) is connected to a fan located outside the biological treatment tank (1).

7. The sewage treatment tank according to claim 1, characterized in that: The mesh tube filler (8) is a columnar structure with a height ranging from 400 to 500 mm and an outer diameter ranging from 50 to 60 mm.

8. The sewage treatment tank according to claim 1, characterized in that: Two adjacent outer adsorption strips (81) are arranged in parallel to form the first gap (811), and the width of the first gap (811) is 5.5-6.5 mm; two adjacent inner adsorption strips (82) are arranged in parallel to form the second gap (821), and the width of the second gap (821) is 5.5-6.5 mm.

9. The sewage treatment tank according to any one of claims 1, 7 and 8, characterized in that: The inner adsorption strip (82) is a cylinder, and the diameter of the bottom surface of the inner adsorption strip (82) ranges from 2.0 to 2.4 mm; the outer adsorption strip (81) is a cylinder, and the diameter of the bottom surface of the outer adsorption strip (81) ranges from 2.0 to 2.4 mm.

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