Sewage treatment device

Abstract

The invention relates to a sewage treatment device, comprising: a sewage tank for storing sewage; the sludge tank is used for storing sludge mixed with magnetic powder; the sewage tank is communicated with the mixing tank through a water inlet pump, the sludge tank is communicated with the mixing tank through a sludge inlet pump, and a stirring device for uniformly stirring the sewage and the sludge is arranged in the mixing tank; the settling pond comprises a supernatant area arranged at the upper part and a triangular weir area arranged at the lower part, the supernatant area is provided with an overflow device, the side section of the triangular weir area is a right triangle, a magnet is arranged at the bevel edge of the side section, and the triangular weir area is communicated with the sludge tank through a sludge internal circulating pump.

Description

Technical Field

[0001] The invention relates to the field of sewage treatment, and in particular to a sewage treatment device. Background Art

[0002] Traditional sewage treatment processes, especially the activated sludge process, are difficult to achieve carbon neutrality due to their high energy consumption and severe carbon mineralization during aeration. Therefore, the development of new sewage treatment technologies has become a research hotspot in the current sewage treatment field. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a sewage treatment device with a novel structure.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A sewage treatment device, comprising:

[0006] A sewage tank, wherein the sewage tank is used to store sewage;

[0007] A sludge tank, wherein the sludge tank is used to store sludge mixed with magnetic powder;

[0008] A mixing tank, wherein the sewage tank is connected to the mixing tank via a water inlet pump, and the sludge tank is connected to the mixing tank via a sludge inlet pump, and a stirring device for uniformly stirring the sewage and sludge is provided in the mixing tank;

[0009] A sedimentation tank, the sedimentation tank includes a supernatant area arranged at the upper part and a triangular weir area arranged at the lower part, the supernatant area is provided with an overflow device, the side section of the triangular weir area is a right triangle, a magnet is provided at the hypotenuse of the side section, and the triangular weir area is connected to the sludge tank through a sludge internal circulation pump.

[0010] In one embodiment, the magnetic powder has a mesh size of 600 to 1200.

[0011] In one embodiment, the sludge concentration in the mixing tank is 3-5 gMLSS / L.

[0012] In one embodiment, the water inlet pump controls the flow rate of sewage in the sewage tank entering the mixing tank to be 300-500 ml / min, and / or the sludge inlet pump controls the flow rate of sludge in the sludge tank entering the mixing tank to be 300-500 ml / min.

[0013] In one embodiment, the dosage of the magnetic powder in the sludge tank is 0.5-2 g / L.

[0014] In one embodiment, in a single cycle, the mixing time of the sewage and the sludge in the mixing tank is 8 to 12 minutes, and / or, in a single cycle, the sedimentation time of the sewage and the sludge mixture in the sedimentation tank is 8 to 12 minutes.

[0015] In one embodiment, the rotation speed of the stirring device in the mixing tank is 100 rpm.

[0016] In one embodiment, the sludge tank can replenish the sludge mixed with magnetic powder into the mixing tank through the sludge inlet pump.

[0017] In one embodiment, the sewage treatment device also includes a hydrolysis tank, which is connected to the triangular weir area in the sedimentation tank. When the sludge enters the sludge tank through the sludge internal circulation pump for 200 to 300 cycles, the sludge in the sedimentation tank is introduced into the hydrolysis tank.

[0018] In one embodiment, the hydrolysis tank is a low-temperature thermal hydrolysis tank, and the hydrolysis temperature of the hydrolysis tank is 40-60°C.

[0019] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0020] The sewage treatment device of the present invention mixes magnetic powder into the sludge and sets a magnet in the hypotenuse area of ​​the right-angle triangular weir of the sedimentation tank, accelerates the separation of sludge and sewage through the magnetic field, and the settled sludge is returned to the sludge tank through the internal circulation pump for reuse, and the unsettled sewage is discharged from the system through the overflow device. Compared with the traditional sewage treatment method, the present invention reduces the dependence on chemical agents and reduces the carbon mineralization loss of aeration during sewage treatment. At the same time, it is particularly suitable for low-temperature and high-concentration sewage treatment processes in cold areas. The magnetic separation technology can still operate effectively under low temperature conditions, accelerates the sedimentation rate of sludge, and ensures the continuity and efficiency of sewage treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of sewage treatment plant.

[0022] The numbers in the figure are:

[0023] 1- sewage tank; 11- water inlet pump; 2- sludge tank; 21- sludge inlet pump; 3- mixing tank; 41- supernatant area; 411- overflow device; 42- triangular weir area; 43- magnet; 44- sludge internal circulation pump; 5- hydrolysis tank; 6- stirring paddle; 7- stirring device. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the examples. However, the present invention is not limited to the following examples. The implementation conditions used in the examples can be further adjusted according to the different requirements of specific use, and the implementation conditions not specified are conventional conditions in the industry. The technical features involved in each embodiment of the present invention can be combined with each other as long as they do not conflict with each other.

[0025] like Figure 1 As shown, the sewage treatment device of the present invention comprises a sewage tank 1, a sludge tank 2, a mixing tank 3, a sedimentation tank and a hydrolysis tank 5, specifically:

[0026] The sewage tank 1 is used to store sewage, which can be urban domestic sewage after passing through a fine grid. The sludge tank 2 is used to store sludge mixed with magnetic powder, the magnetic powder is 600-1200 mesh, and the amount of magnetic powder added to the sludge tank 2 is 0.5-2g / L. In some embodiments, the magnetic powder can be 600-800 mesh, and in some embodiments, the magnetic powder can also be 800-1200 mesh. In some embodiments, a stirring paddle 6 can be respectively provided in the sewage tank 1 and the sludge tank 2 to make the components in the sewage and the sludge more uniform.

[0027] The sewage tank 1 is connected to the mixing tank 3 through the water inlet pump 11, and the water inlet pump 11 controls the flow rate of the sewage in the sewage tank 1 into the mixing tank 3 to be 300-500 ml / min. The sludge tank 2 is connected to the mixing tank 3 through the sludge inlet pump 21, and the sludge in the sludge tank 2 is controlled by the sludge inlet pump 21. The flow rate of the sludge entering the mixing tank 3 is 300-500 ml / min. In some embodiments, the sludge concentration in the mixing tank 3 is 3-5 gMLSS / L, and the mixing tank 3 is provided with a stirring device 7 for stirring the sewage and sludge evenly. The speed of the stirring device 7 in the mixing tank 3 is 100 rpm. In some embodiments, the mixing time of the sewage and sludge in the mixing tank 3 is 8-12 minutes. After the sewage and sludge are evenly mixed, a suspension is formed. The stirring device 7 ensures that the sludge is fully in contact with the sewage, thereby enhancing the flocculation effect of the magnetic powder. In some embodiments, in order to mix the sewage and sludge more evenly and to have higher stirring efficiency, two or more mixing tanks can be set.

[0028] The sedimentation tank includes a supernatant area 41 arranged at the top and a triangular weir area 42 arranged at the bottom. The supernatant area 41 is provided with an overflow device 411. The side section of the triangular weir area 42 is a right triangle. A magnet 43 is provided at the hypotenuse of the side section. The triangular weir area 42 is connected to the sludge tank 2 through a sludge internal circulation pump 44. The suspension mixed in the mixing tank 3 enters the sedimentation tank. The magnet 43 accelerates the separation of sludge and sewage through the magnetic field. The sludge settles quickly. The settled sludge flows back to the sludge tank 2 through the sludge internal circulation pump 44, and the unsettled sewage is discharged from the system through the overflow device 411. During the operation of the entire sewage treatment device, the settled sludge will cause the loss of sludge and magnetic powder after repeated reflux. After a certain number of cycles, the sludge tank 2 can replenish the sludge mixed with magnetic powder into the mixing tank 3 through the mud inlet pump 21 to maintain the separation efficiency.

[0029] The hydrolysis tank 5 is connected to the triangular weir area 42 in the sedimentation tank. When the sludge enters the sludge tank through the sludge internal circulation pump 44 for 200 to 300 cycles, the sludge in the sedimentation tank is introduced into the hydrolysis tank 5. The hydrolysis tank 5 is a low-temperature hot hydrolysis tank. The hydrolysis temperature of the hydrolysis tank 5 is 40 to 60°C. Specifically, the required temperature of the hydrolysis tank can be maintained by arranging a heating device in the hydrolysis tank 5. In the anaerobic environment of the hydrolysis tank, the organic matter in the sludge is decomposed into small molecule carbon sources that are easy to handle, and phosphorus can be recovered. Specifically, the small molecule carbon source and phosphorus obtained after hydrolysis can be exported, and the hydrolyzed sludge is continuously introduced into the sludge tank 2 for circulation, thereby ensuring the maximum decomposition of organic matter in the sludge and resource recovery.

[0030] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A sewage treatment device, characterized in that: include: A sewage tank, wherein the sewage tank is used to store sewage; A sludge tank, wherein the sludge tank is used to store sludge mixed with magnetic powder; A mixing tank, wherein the sewage tank is connected to the mixing tank via a water inlet pump, and the sludge tank is connected to the mixing tank via a sludge inlet pump, and a stirring device for uniformly stirring the sewage and sludge is provided in the mixing tank; A sedimentation tank, the sedimentation tank includes a supernatant area arranged at the upper part and a triangular weir area arranged at the lower part, the supernatant area is provided with an overflow device, the side section of the triangular weir area is a right triangle, a magnet is provided at the hypotenuse of the side section, and the triangular weir area is connected to the sludge tank through a sludge internal circulation pump.

2. The sewage treatment device according to claim 1, characterized in that: The magnetic powder has a mesh size of 600 to 1200.

3. The sewage treatment device according to claim 1, characterized in that: The sludge concentration in the mixing tank is 3-5 gMLSS / L.

4. The sewage treatment device according to claim 1, characterized in that: The water inlet pump controls the flow rate of sewage in the sewage tank entering the mixing tank to be 300-500 ml / min, and / or the sludge inlet pump controls the flow rate of sludge in the sludge tank entering the mixing tank to be 300-500 ml / min.

5. The sewage treatment device according to claim 1, characterized in that: The dosage of the magnetic powder in the sludge tank is 0.5-2 g / L.

6. The sewage treatment device according to claim 1, characterized in that: In a single cycle, the mixing time of the sewage and the sludge in the mixing tank is 8 to 12 minutes, and / or, in a single cycle, the sedimentation time of the sewage and the sludge mixture in the sedimentation tank is 8 to 12 minutes.

7. The sewage treatment device according to claim 1, characterized in that: The rotation speed of the stirring device in the mixing tank is 100 rpm.

8. The sewage treatment device according to claim 1, characterized in that: The sludge tank can replenish the sludge mixed with magnetic powder into the mixing tank through the sludge inlet pump.

9. The sewage treatment device according to claim 1, characterized in that: The sewage treatment device also includes a hydrolysis tank, which is connected to the triangular weir area in the sedimentation tank. When the sludge enters the sludge tank through the sludge internal circulation pump for 200 to 300 cycles, the sludge in the sedimentation tank is introduced into the hydrolysis tank.

10. The sewage treatment device according to claim 9, characterized in that: The hydrolysis tank is a low-temperature thermal hydrolysis tank, and the hydrolysis temperature of the hydrolysis tank is 40-60°C.

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