Grit chamber

Abstract

The invention provides a grit chamber, and belongs to the technical field of sewage treatment.The grit chamber comprises a chamber body and at least one grit setting assembly, the grit setting assembly is arranged in the middle of the chamber body, a plurality of grit setting channels are formed in the grit setting assembly, and the grit setting channels are obliquely arranged. The settling area is divided into multiple layers of shallow layer units by the multiple sand settling channels in the sand settling assembly, the effective settling area is greatly increased, the particle settling distance is shortened, and therefore the settling speed is increased, sand can be removed only by settling for a very short vertical distance, the fine sand removing capacity of the sand settling tank is improved, and the sand settling efficiency is improved. And the particle size of the removed object in the grit chamber is reduced to be less than 200 mu m.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of sewage treatment, and more particularly, relates to the technical field of sewage treatment. BACKGROUND

[0002] In the process of sewage treatment, the role of the grit chamber is to remove sand, and the composition of the sand includes sand particles, gravel, slag and other heavy solid substances, and the settling velocity or relative density of which is obviously greater than that of the organic solid substances in the sewage. The form of the grit chamber can be divided into three types, i.e., horizontal flow type, vertical flow type and rotational flow type, according to the water flow direction in the chamber; and the grit chamber can be divided into horizontal flow type grit chamber, vertical flow type grit chamber, aeration grit chamber and rotational flow type grit chamber according to the chamber type. The process of sand removal includes three steps: the first step is that the sand particles are precipitated to the sand accumulation tank in the grit chamber, which is referred to as "settling"; the second step is that the sand particles in the sand accumulation tank are lifted to the outside of the grit chamber by the sand lifting equipment, which is referred to as "lifting"; and the third step is that the sand-water mixture lifted to the outside of the chamber is subjected to sand-water separation by the sand-water separator, the sand particles are transported out, and the sewage is returned to the pipeline of the sewage treatment plant, which is referred to as "separation".

[0003] The traditional grit chamber mainly has the following problems:

[0004] (1) The object of removing sand particles is sand particles with a particle size of 200 μm or more and a density significantly higher than that of water, and the removal effect on sand particles with a smaller particle size is poor.

[0005] (2) The scum scraper cannot adapt to water level fluctuation, and there is a problem that the scum cannot be scraped.

[0006] (3) Large foreign matters are easy to enter the sand lifting equipment to cause blockage.

[0007] (4) The precipitated sand particles are dispersed on the bottom of the chamber, the sand lifting assembly needs to be moved to lift the sand, and the deodorizing sealing cover plate is provided with a long slit to cooperate with the movement of the sand lifting assembly, and the long slit can cause the odor of the grit chamber to escape. SUMMARY

[0008] The purpose of the present application is to provide a grit chamber to solve the problem of poor removal effect of the traditional grit chamber on small particle size sand particles.

[0009] In order to achieve the above purpose, the present application provides a grit chamber, comprising:

[0010] a chamber body;

[0011] at least one grit assembly, the grit assembly is arranged in the middle of the chamber body, a plurality of grit channels are formed in the interior of the grit assembly, and the grit channels are arranged obliquely.

[0012] Optionally, the grit assembly comprises a plurality of inclined plates arranged at intervals, and the grit channels are formed between adjacent inclined plates.

[0013] Optionally, the inclination angle of the inclined plate is 15°-75°, the spacing between adjacent inclined plates is 300mm-500mm, and the length of the inclined plate is 0.8m-1.2m.

[0014] Optionally, the sedimentation assembly includes a plurality of inclined tubes, the sedimentation channel being formed inside the inclined tubes.

[0015] Optionally, the inclination angle of the inclined tube is 15°-75°, the inner diameter of the inclined tube is 50mm-100mm, and the length of the inclined tube is 0.8m-1.2m.

[0016] Optionally, the sedimentation tank also includes:

[0017] A first gas pipeline is located below the sedimentation assembly. The first gas pipeline has multiple first air holes facing the sedimentation assembly and is connected to a high-pressure gas source.

[0018] Optionally, the sedimentation tank also includes:

[0019] At least one submersible sand-draining inclined plate is provided at the bottom of the pool body and is located below the sand settling assembly. The upper surface of the submersible sand-draining inclined plate is herringbone shaped, and sand accumulation areas are formed near both ends of the submersible sand-draining inclined plate.

[0020] At least two fixed sand-lifting components are provided, with one fixed sand-lifting component corresponding to each sand accumulation area, and the sand-lifting port of the fixed sand-lifting component is located in the sand accumulation area;

[0021] A deodorizing sealed cover is provided on the top of the pool body. The deodorizing sealed cover has a through hole through which the sand lifting component passes.

[0022] Optionally, the sedimentation tank also includes:

[0023] The second gas pipeline is located above the underwater sand-removing inclined plate. The second gas pipeline has multiple second gas holes facing the underwater sand-removing inclined plate. The second gas pipeline is connected to a high-pressure gas source.

[0024] Optionally, the sedimentation tank also includes:

[0025] A sand-lifting port protective cover is disposed outside the sand-lifting port, and the sand-lifting port protective cover has multiple mesh holes;

[0026] The third gas pipeline has one end located inside the sand-lifting port protective cover, and one end of the third gas pipeline has a third gas outlet. The other end of the third gas pipeline is connected to a high-pressure gas source.

[0027] Optionally, the sedimentation tank also includes:

[0028] A scum removal device is inclinedly installed on the upper part of the pool.

[0029] The beneficial effects of this invention are as follows: It provides a sedimentation tank comprising a tank body and at least one sedimentation component. The sedimentation component is disposed in the middle of the tank body, and multiple sedimentation channels are formed inside the sedimentation component, with the channels arranged at an angle. The multiple sedimentation channels inside the sedimentation component divide the sedimentation zone into multiple shallow units, significantly increasing the effective sedimentation area and shortening the particle settling distance, thereby accelerating the settling speed. Sand particles only need to settle a very short vertical distance to be removed, improving the sedimentation tank's ability to remove fine sand and reducing the particle size of the target particles to below 200 μm.

[0030] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0031] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0032] Figure 1 A schematic structural diagram of a sedimentation tank according to Embodiment 1 of the present invention is shown.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Tank body; 2. Grit settling assembly; 3. First gas pipeline; 4. Air compressor; 5. Air storage tank; 6. Submersible sand-removing inclined plate; 7. Fixed sand-lifting assembly; 8. Deodorizing sealing cover; 9. Second gas pipeline; 10. Sand-lifting port protective cover; 11. Third gas pipeline; 12. Scum removal device; 13. Water inlet guide plate. Detailed Implementation

[0035] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0036] Example 1

[0037] This embodiment provides a sedimentation tank, including:

[0038] Pool body 1;

[0039] At least one sedimentation component 2 is provided, which is located in the middle of the pool body 1. Multiple sedimentation channels are formed inside the sedimentation component 2, and the sedimentation channels are inclined.

[0040] Specifically, according to Hazen's shallow sedimentation theory, sedimentation efficiency is directly proportional to the sedimentation area and independent of the sedimentation depth. Multiple sedimentation channels within the grit chamber 2 divide the sedimentation zone into multiple shallow units, significantly increasing the effective sedimentation area and shortening the particle settling distance, thereby accelerating the settling speed. Sand particles only need to settle a short vertical distance to be removed, improving the grit chamber's ability to remove fine sand and reducing the particle size of the target particles to below 200μm.

[0041] In this embodiment, the sedimentation tank also includes an inlet guide plate 13, which is existing technology and is used to adjust the position of the inlet of the sedimentation tank so that it is close to the bottom of the tank. The sedimentation assembly 2 is configured with an adjustable angle to adapt to different working conditions.

[0042] Optionally, the sedimentation assembly 2 includes multiple inclined plates spaced apart, with sedimentation channels formed between adjacent inclined plates. In this embodiment, the inclination angle of the inclined plates is 15°-75°, the spacing between adjacent inclined plates is 300mm-500mm, and the length of the inclined plates is 0.8m-1.2m.

[0043] Optionally, the sedimentation tank also includes a first gas pipeline 3, which is located below the sedimentation component 2. The first gas pipeline 3 has multiple first air holes facing the sedimentation component 2 and is connected to a high-pressure gas source.

[0044] Specifically, the first gas pipeline 3 uses high-pressure gas to push and vibrate the sand in the sand settling component 2, causing the sand settled on the sand settling component 2 to fall off and preventing sand particles from adhering.

[0045] Optionally, the sedimentation tank also includes:

[0046] At least one submersible sand-draining inclined plate 6 is provided at the bottom of the pool body 1 and is located below the sand settling assembly 2. The upper surface of the submersible sand-draining inclined plate 6 is herringbone shaped, and sand accumulation areas are formed near both ends of the submersible sand-draining inclined plate 6.

[0047] At least two fixed sand-lifting components 7 are provided, with one fixed sand-lifting component 7 corresponding to each sand accumulation area, and the sand-lifting port of the fixed sand-lifting component 7 is located in the sand accumulation area;

[0048] The deodorizing sealed cover 8 is located on the top of the pool body 1. The deodorizing sealed cover 8 has through holes through which the sand lifting component passes.

[0049] Specifically, in traditional grit chambers, the settled sand particles are dispersed at the bottom. The sand-lifting component needs to be moved to lift the sand, and the deodorizing sealing cover 8 has long slits to facilitate the movement of the sand-lifting component. These slits can cause odor to escape from the grit chamber. The grit chamber of this invention utilizes an underwater sand-draining inclined plate 6 to guide the sand particles to the two sand accumulation areas at both ends. The sand-lifting component 7 is fixed in the sand accumulation area to lift the sand. The deodorizing sealing cover 8 does not need to have long slits, improving the deodorizing and sealing effect and solving the problem of odor escape from the grit chamber.

[0050] In this embodiment, the fixed sand lifting assembly 7 includes a pump body, which can be an air-lift pump, a submersible pump, a sand pump, or a rotary pump. The deodorizing sealing cover 8 is provided with a deodorizing exhaust port and an inspection port. The submersible sand conveying inclined plate is made of a smooth, corrosion-resistant, and structurally strong material.

[0051] Optionally, the sedimentation tank may also include:

[0052] The second gas pipeline 9 is located above the underwater sand-removing inclined plate 6. The second gas pipeline 9 has multiple second gas holes facing the underwater sand-removing inclined plate 6. The second gas pipeline 9 is connected to a high-pressure gas source.

[0053] Specifically, the underwater sand conveying inclined plate guides sand particles to both ends through its bidirectional inclined surface. Combined with the airflow of the second gas pipeline 9, it forms a dual-drive mode of "gravity + airflow", which significantly improves sand discharge efficiency and is especially suitable for high sand content scenarios.

[0054] In this embodiment, the second gas pipeline 9 is equipped with a valve, and the end of the pipeline is sealed. The pipeline on the submersible sand conveying inclined plate is perforated evenly. High-pressure gas is periodically used to flush away the sand deposited on the submersible sand conveying inclined plate, causing the sand to move down the inclined plate.

[0055] Optionally, the sedimentation tank also includes:

[0056] Sand lifting port protective cover 10 is disposed outside the sand lifting port and has multiple mesh holes;

[0057] The third gas pipeline 11 has one end installed inside the sand lifting port protective cover 10, and one end of the third gas pipeline 11 is provided with a third gas outlet. The other end of the third gas pipeline 11 is connected to a high-pressure gas source.

[0058] Specifically, the sand lifting port protective cover 10 can prevent large foreign objects from entering the sand lifting pipe, and the gas backflow can prevent serious blockage of the outer wall of the protective cover and extend the continuous operation time.

[0059] In this embodiment, the sand-lifting port protective cover 10 can be rectangular, circular, or elliptical, and is made of a smooth, corrosion-resistant, and structurally strong material. The third gas pipeline 11 is equipped with a valve, and the end of the pipeline is open. High-pressure gas is periodically used to backflush the sand-lifting port protective cover 10 to flush away large foreign objects trapped outside the cover.

[0060] Optionally, the sedimentation tank also includes:

[0061] Scum removal device 12 is inclinedly installed on the upper part of the pool body 1.

[0062] Specifically, the scum removal device 12 is an existing product. However, in traditional grit chambers, the scum removal device 12 is horizontally installed. Fluctuations in the water level can cause the scum removal device 12 to be above or below the water level, resulting in the problem of not being able to scrape the scum. In this invention, the scum removal device 12 is inclined, so that scum can still be removed when the liquid level in the tank fluctuates.

[0063] In this embodiment, the scum removal device 12 can be a rotary grid type, a toothed rake type, or a claw type.

[0064] Example 2

[0065] This embodiment provides a sedimentation tank, which differs from Embodiment 1 in that the sedimentation component 2 includes multiple inclined tubes, and sedimentation channels are formed inside the inclined tubes.

[0066] The inclination angle of the inclined tube is 15°-75°, the inner diameter of the inclined tube is 50mm-100mm, and the length of the inclined tube is 0.8m-1.2m.

[0067] Specifically, multiple inclined tubes form multiple sedimentation channels, dividing the sedimentation zone into multiple shallow units, which greatly increases the effective sedimentation area and shortens the particle settling distance, thereby accelerating the settling speed. Sand particles only need to settle a very short vertical distance to be removed, which improves the ability of the sedimentation tank to remove fine sand and reduces the particle size of the object to be removed in the sedimentation tank to below 200μm.

[0068] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A grit chamber, characterized in that It comprises: a pool body (1); at least one sand setting assembly (2) arranged in the middle of the pool body (1), the inside of the sand setting assembly (2) is formed with a plurality of sand setting channels, and the sand setting channels are arranged obliquely.

2. The sand setting pool according to claim 1, wherein the sand setting assembly (2) comprises a plurality of inclined plates arranged at intervals, and the sand setting channels are formed between adjacent inclined plates.

3. The sand setting pool according to claim 2, wherein the inclination angle of the inclined plate is 15°-75°, the distance between adjacent inclined plates is 300mm-500mm, and the length of the inclined plate is 0.8m-1.2m.

4. The sand setting pool according to claim 1, wherein the sand setting assembly (2) comprises a plurality of inclined pipes, and the sand setting channels are formed in the inclined pipes.

5. The sand setting pool according to claim 4, wherein the inclination angle of the inclined pipe is 15°-75°, the inner diameter of the inclined pipe is 50mm-100mm, and the length of the inclined pipe is 0.8m-1.2m.

6. The grit chamber of claim 1, wherein, It also comprises: a first gas pipeline (3) arranged below the sand setting assembly (2), the first gas pipeline (3) is provided with a plurality of first air holes facing the sand setting assembly (2), and the first gas pipeline (3) is connected with a high-pressure gas source.

7. The grit chamber of claim 1, wherein, It also comprises: at least one underwater sand removal inclined plate (6) arranged at the bottom of the pool body (1) and below the sand setting assembly (2), the upper surface of the underwater sand removal inclined plate (6) is in a herringbone shape, and sand accumulation areas are formed near both ends of the underwater sand removal inclined plate (6); at least two fixed sand lifting assemblies (7), one fixed sand lifting assembly (7) is arranged corresponding to each sand accumulation area, and the sand lifting opening of the fixed sand lifting assembly (7) is arranged in the sand accumulation area; a deodorizing sealing cover plate (8) arranged at the top of the pool body (1), the deodorizing sealing cover plate (8) is provided with a through hole, and the sand lifting assembly passes through the through hole.

8. The grit chamber of claim 7, wherein, It also comprises: a second gas pipeline (9) arranged above the underwater sand removal inclined plate (6), the second gas pipeline (9) is provided with a plurality of second air holes facing the underwater sand removal inclined plate (6), and the second gas pipeline (9) is connected with a high-pressure gas source.

9. The grit chamber of claim 7, wherein, It also comprises: a sand lifting opening protection cover (10) arranged outside the sand lifting opening, the sand lifting opening protection cover (10) is formed with a plurality of mesh holes; a third gas pipeline (11) having one end arranged in the sand lifting opening protection cover (10) and the other end connected with a high-pressure gas source, and the one end of the third gas pipeline (11) is provided with a third air outlet hole.

10. The grit chamber of claim 1, wherein, It also comprises: a scum skimming device (12) arranged obliquely at the upper part of the pool body (1).

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