A wastewater treatment system

Abstract

The utility model relates to wastewater treatment technical field discloses a wastewater treatment system, including neutralization tower, carbon dioxide supply pipeline, wastewater discharge pipeline, first clarification bucket, first mixing tank, clean waste liquid bucket, acid liquid tank, first acid liquid supply pipeline, first flow meter, second flow meter, first regulating valve, third flow meter and second regulating valve. Carbon dioxide supply pipeline and wastewater discharge pipeline all are linked with neutralization tower, be provided with first flow meter on wastewater discharge pipeline, be provided with first regulating valve and second flow meter on carbon dioxide supply pipeline. The water outlet of neutralization tower is linked with first clarification bucket, and the liquid outlet of first clarification bucket is linked with clean waste liquid bucket. Be provided with first mixing tank on the communication pipeline of neutralization tower and first clarification bucket, be provided with the sink aid adding mouth on first mixing tank. The liquid outlet of acid liquid tank is linked with the liquid inlet of clean waste liquid bucket through first acid liquid supply pipeline.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a wastewater treatment system. Background Technology

[0002] Soda ash plants generate large amounts of alkaline wastewater during the soda ash production process. This wastewater needs to be neutralized before discharge to ensure the pH value meets discharge requirements. Currently, soda ash plants typically neutralize alkaline wastewater by introducing large amounts of carbon dioxide. However, when the carbon dioxide supply is insufficient, limiting the alkaline wastewater treatment capacity, it severely restricts the soda ash production of the plant and affects its profitability.

[0003] Therefore, there is an urgent need for a wastewater treatment system to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a wastewater treatment system that ensures the neutralization effect of wastewater when the carbon dioxide supply cannot meet the neutralization requirements of alkaline wastewater.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A wastewater treatment system includes a neutralization tower, a carbon dioxide supply pipeline, a wastewater discharge pipeline, a primary clarification tank, a first mixing tank, a wastewater clearing tank, an acid tank, a first acid supply pipeline, a first flow meter, a second flow meter, a first regulating valve, a third flow meter, and a second regulating valve.

[0007] Both the carbon dioxide supply pipeline and the wastewater discharge pipeline are connected to the neutralization tower. A first flow meter is installed on the wastewater discharge pipeline, and a first regulating valve and a second flow meter are installed on the carbon dioxide supply pipeline.

[0008] The drain outlet of the neutralization tower is connected to the primary clarification tank, and the liquid outlet of the primary clarification tank is connected to the waste liquid tank.

[0009] A first mixing tank is provided on the connecting pipeline between the neutralization tower and the primary clarification tank, and a flocculant addition port is provided on the first mixing tank;

[0010] The outlet of the acid tank is connected to the inlet of the waste liquid tank via the first acid supply pipeline. The first acid supply pipeline is equipped with a second regulating valve and a third flow meter.

[0011] As an improvement to the above technical solution, it also includes a flocculant tank and a flocculant supply pipeline, wherein the outlet of the flocculant tank is connected to the flocculant addition port of the first mixing tank via the flocculant supply pipeline.

[0012] As an improvement to the above technical solution, it also includes a water purification tank and a second clarification tank. The outlet of the waste liquid tank is connected to the inlet of the water purification tank. The water purification tank is provided with a water purification agent addition port. The outlet of the water purification tank is connected to the inlet of the second clarification tank.

[0013] As an improvement to the above technical solution, it also includes a water purification agent tank, a first water purification agent supply pipeline, and a third regulating valve. The outlet of the water purification agent tank is connected to the water purification bucket via the first water purification agent supply pipeline, and the third regulating valve is provided on the first water purification agent supply pipeline.

[0014] As an improvement to the above technical solution, it also includes a second mixing tank, a second water purification agent supply pipeline, a first shut-off valve, and a fourth regulating valve. The outlet of the waste liquid tank is connected to the inlet of the second clarification tank, and the first shut-off valve and the second mixing tank are provided on the connecting pipeline between the waste liquid tank and the second clarification tank. The outlet of the water purification agent tank is connected to the second mixing tank via the second water purification agent supply pipeline, and the fourth regulating valve is provided on the second water purification agent supply pipeline.

[0015] As an improvement to the above technical solution, a pump set is also included, which includes a first delivery pump and a second delivery pump. The first delivery pump is installed at the outlet of the waste liquid tank, and the second delivery pump is installed at the outlet of the water purification agent tank.

[0016] As an improvement to the above technical solution, it also includes a second acid supply pipeline, a fifth regulating valve and a fourth flow meter. The outlet of the acid tank is connected to the second clarification tank through the second acid supply pipeline, and the fifth regulating valve and the fourth flow meter are installed on the second acid supply pipeline.

[0017] As an improvement to the above technical solution, a sand separator is also included. The lower part of the neutralization tower is provided with a sludge outlet, and the sludge outlet of the neutralization tower is connected to the sand separator. The sand separator is provided with a liquid outlet and a sludge outlet.

[0018] As an improvement to the above technical solution, it also includes a ground trough and a second shut-off valve. The outlet of the sand separator is connected to the inlet of the ground trough, the outlet of the ground trough is connected to the inlet of the neutralization tower, and is also connected to the first mixing tank. The second shut-off valve is provided on the connecting pipeline between the ground trough and the neutralization tower, as well as on the connecting pipeline between the ground trough and the first mixing tank.

[0019] As an improvement to the above technical solution, multiple neutralization towers are provided, including a first neutralization tower and a second neutralization tower. Multiple primary clarification tanks are provided, including a first primary clarification tank and a second primary clarification tank. The mixing tank is provided in a one-to-one correspondence with the primary clarification tank. The liquid outlet of the first neutralization tower is connected to the liquid inlet of the first primary clarification tank, and the liquid outlet of the second neutralization tower is connected to the liquid inlet of the second primary clarification tank.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] This invention relates to a wastewater treatment system where wastewater from a soda ash plant reaches a neutralization tower via a wastewater discharge pipeline. Carbon dioxide is supplied to the neutralization tower through a carbon dioxide supply pipeline to neutralize the alkaline wastewater. After neutralization, the alkaline wastewater passes through a first mixing tank with added flocculant before reaching a primary clarification tank for clarification. The flow rate of the wastewater discharge pipeline is monitored by a first flow meter, and the carbon dioxide supply is monitored by a second flow meter. The carbon dioxide supply is adjusted by a first regulating valve. When the carbon dioxide supply is insufficient to meet the neutralization requirements of the alkaline wastewater, acid is supplied to the wastewater tank through a first acid supply pipeline to further neutralize any remaining alkaline wastewater that was not completely neutralized by carbon dioxide, ensuring the neutralization effect of the alkaline wastewater. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the wastewater treatment system provided in an embodiment of the present invention.

[0023] In the picture:

[0024] 111. First Neutralization Tower; 112. Second Neutralization Tower;

[0025] 12. Carbon dioxide supply pipeline;

[0026] 13. Wastewater discharge pipeline;

[0027] 141. First primary clarification tank; 142. Second primary clarification tank;

[0028] 15. First mixing tank; 16. Waste liquid tank; 17. Acid tank; 18. First acid supply pipeline; 19. Clean water tank; 20. Second clarification tank; 21. Water purification agent tank; 22. First water purification agent supply pipeline; 23. Second mixing tank; 24. Second water purification agent supply pipeline;

[0029] 25. Pump set; 251. First transfer pump; 252. Second transfer pump; 253. Slurry pump; 26. Second acid supply pipeline; 27. Sand separator; 28. Ground tank; 29. ​​Filter press; 30. Miscellaneous water tank; 31. First centrifuge; 32. Second centrifuge; 33. First mixing tank; 34. Intermediate tank; 35. Reclaimed water pipeline; 36. Second mixing tank; 37. Direct current water supply pipeline; 38. Buffer tank; 39. Low-chlorine white mud tank;

[0030] 40. First flow meter; 41. Second flow meter; 42. First regulating valve; 43. Third flow meter; 44. Second regulating valve; 45. Settling agent supply pipeline; 46. Third regulating valve; 47. First shut-off valve; 48. Fourth regulating valve; 49. Fifth regulating valve; 50. Fourth flow meter; 51. Second shut-off valve. Detailed Implementation

[0031] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0032] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0035] like Figure 1 As shown, this embodiment provides a wastewater treatment system for treating alkaline wastewater from a soda ash plant. It ensures that soda ash production is maintained even when carbon dioxide supply is insufficient, preventing a drop in soda ash production due to insufficient carbon dioxide supply and guaranteeing the plant's production efficiency.

[0036] The wastewater treatment system includes a neutralization tower, a carbon dioxide supply pipeline 12, a wastewater discharge pipeline 13, a primary clarification tank, a first mixing tank 15, a waste liquid tank 16, an acid tank 17, a first acid supply pipeline 18, a first flow meter 40, a second flow meter 41, a first regulating valve 42, a third flow meter 43, and a second regulating valve 44. Both the carbon dioxide supply pipeline 12 and the wastewater discharge pipeline 13 are connected to the neutralization tower. The first flow meter 40 is installed on the wastewater discharge pipeline 13, and the first regulating valve 42 and the second flow meter 41 are installed on the carbon dioxide supply pipeline 12. The drain outlet of the neutralization tower is connected to the primary clarification tank, and the outlet of the primary clarification tank is connected to the waste liquid tank 16. The first mixing tank 15 is installed on the connecting pipeline between the neutralization tower and the primary clarification tank, and the first mixing tank 15 is equipped with a flocculant addition port. The outlet of the acid tank 17 is connected to the inlet of the waste liquid tank 16 via the first acid supply pipeline 18. The first acid supply pipeline 18 is equipped with a second regulating valve 44 and a third flow meter 43.

[0037] The wastewater treatment system provided in this embodiment delivers wastewater from a soda ash plant to a neutralization tower via wastewater discharge pipeline 13. Carbon dioxide is supplied to the neutralization tower via carbon dioxide supply pipeline 12 to neutralize the alkaline wastewater. After neutralization by carbon dioxide, the alkaline wastewater passes through a first mixing tank 15 with added flocculant before reaching a primary clarification tank for clarification. The flow rate of wastewater discharge pipeline 13 is monitored by a first flow meter 40, and the carbon dioxide supply is monitored by a second flow meter 41. The carbon dioxide supply is adjusted by a first regulating valve 42. When the carbon dioxide supply is insufficient to meet the neutralization requirements of the alkaline wastewater, acid is supplied to the wastewater tank 16 via a first acid supply pipeline 18 to further neutralize the alkaline wastewater that was not completely neutralized by carbon dioxide, ensuring the neutralization effect of the alkaline wastewater.

[0038] In this embodiment, the acid solution is a by-product acid to reduce the cost of the acid solution.

[0039] Furthermore, the liquid outlet of the primary clarification tank is located at the top, and the slurry outlet is also located at the bottom of the primary clarification tank. The clarified supernatant is discharged through the liquid outlet, and the precipitated slurry is discharged through the slurry outlet.

[0040] Furthermore, the wastewater treatment system provided in this embodiment also includes a flocculant tank and a flocculant supply pipeline 45. The outlet of the flocculant tank is connected to the flocculant addition port of the first mixing tank 15 via the flocculant supply pipeline 45. The flocculant dissolves into a liquid in the flocculant tank, and the dissolved flocculant solution is added to the first mixing tank 15 via the flocculant supply pipeline 45.

[0041] Optionally, the wastewater treatment system provided in this embodiment further includes a purified water tank 19 and a second clarification tank 20. The outlet of the purified wastewater tank 16 is connected to the inlet of the purified water tank 19. The purified water tank 19 is provided with a water purification agent addition port, and the outlet of the purified water tank 19 is connected to the inlet of the second clarification tank 20. The second clarification tank 20 is provided with an outlet at the top and a slurry outlet at the bottom. The water purification agent addition port is used to add water purification agent to the purified water tank 19 for further treatment of the wastewater arriving in the purified water tank 19. The wastewater with added water purification agent reaches the second clarification tank 20 and undergoes sedimentation in the second clarification tank 20. The supernatant obtained after sedimentation is discharged from the outlet of the second clarification tank 20, and the slurry obtained after sedimentation is discharged through the slurry outlet of the second clarification tank 20.

[0042] Furthermore, the wastewater treatment system provided in this embodiment also includes a water purification agent tank 21, a first water purification agent supply pipeline 22, and a third regulating valve 46. The outlet of the water purification agent tank 21 is connected to the water purification tank 19 via the first water purification agent supply pipeline 22, and the third regulating valve 46 is provided on the first water purification agent supply pipeline 22. The water purification agent tank 21 is used to store water purification agent, which is supplied to the water purification tank 19 via the first water purification agent supply pipeline 22. The third regulating valve 46 on the first water purification agent supply pipeline 22 is used to control the amount of water purification agent supplied to the water purification tank 19.

[0043] Furthermore, the wastewater treatment system provided in this embodiment also includes a second mixing tank 23, a second water purification agent supply pipeline 24, a first shut-off valve 47, and a fourth regulating valve 48. The outlet of the wastewater tank 16 is connected to the inlet of the second clarification tank 20, and the first shut-off valve 47 and the second mixing tank 23 are provided on the connecting pipeline between the wastewater tank 16 and the second clarification tank 20. The outlet of the water purification agent tank 21 is connected to the second mixing tank 23 via the second water purification agent supply pipeline 24. The fourth regulating valve 48 is provided on the second water purification agent supply pipeline 24. When the water purification tank 19 is under maintenance, the wastewater from the wastewater tank 16 can be directly fed to the second clarification tank 20 after adding water purification agent through the second mixing tank 23, and then clarified in the second clarification tank 20.

[0044] Optionally, in this embodiment, both the first mixing tank 15 and the second mixing tank 23 are curved diameter mixing tanks.

[0045] Optionally, the wastewater treatment system provided in this embodiment further includes a pump set 25, which includes a first delivery pump 251 and a second delivery pump 252. The first delivery pump 251 is provided at the outlet of the waste liquid tank 16 to provide power for the waste liquid tank 16 to supply waste liquid to the clean water tank 19 or the second mixing tank 23. The second delivery pump 252 is provided at the outlet of the water purification agent tank 21 to provide power for the water purification agent tank 21 to supply water purification agent to the clean water tank 19 or the second mixing tank 23.

[0046] Optionally, the wastewater treatment system provided in this embodiment further includes a second acid supply pipeline 26, a fifth regulating valve 49, and a fourth flow meter 50. The outlet of the acid tank 17 is connected to the second clarification tank 20 via the second acid supply pipeline 26. The second acid supply pipeline 26 is equipped with the fifth regulating valve 49 and the fourth flow meter 50. Acid can be supplied from the acid tank 17 to the second clarification tank 20 via the second acid supply pipeline 26 to further neutralize and fine-tune the wastewater, ensuring the neutralization effect.

[0047] Furthermore, the outlet of the second clarification tank 20 is connected to a waste liquid discharge pipe, and a pH detection device is installed on the waste liquid discharge pipe. The pH value of the waste liquid in the waste liquid discharge pipe is detected by the pH detection device. Based on the pH value of the waste liquid in the waste liquid discharge pipe, the amount of acid added to the second clarification tank 20 is controlled by the fifth regulating valve 49 and the fourth flow meter 50 to ensure the pH adjustment effect.

[0048] Optionally, the wastewater treatment system provided in this embodiment further includes a sand separator 27. A sludge outlet is provided at the bottom of the neutralization tower, and the sludge outlet of the neutralization tower is connected to the sand separator 27. The sand separator 27 is provided with a liquid outlet and a sludge outlet. The sludge slurry discharged from the neutralization tower's sludge outlet is separated into sludge and water by the sand separator 27. The sludge separated by the sand separator 27 is discharged through the sludge outlet of the sand separator 27.

[0049] Optionally, the wastewater treatment system provided in this embodiment further includes a trough 28 and a second shut-off valve 51. The outlet of the sand separator 27 is connected to the inlet of the trough 28, and the outlet of the trough 28 is connected to the inlet of the neutralization tower and also to the first mixing tank 15. A second shut-off valve 51 is installed on both the connecting pipes between the trough 28 and the neutralization tower, and on both the connecting pipes between the trough 28 and the first mixing tank 15. The water separated by the sand separator 27 enters the trough 28, and the water in the trough 28 can either return to the neutralization tower or be sent to the first mixing tank 15.

[0050] Optionally, in this embodiment, multiple neutralization towers are provided, including a first neutralization tower 111 and a second neutralization tower 112. Multiple primary clarification tanks are provided, including a first primary clarification tank 141 and a second primary clarification tank 142. A mixing tank is provided in a one-to-one correspondence with the primary clarification tanks. The liquid outlet of the first neutralization tower 111 is connected to the liquid inlet of the first primary clarification tank 141, and the liquid outlet of the second neutralization tower 112 is connected to the liquid inlet of the second primary clarification tank 142.

[0051] Furthermore, the wastewater treatment system provided in this embodiment also includes a filter press 29 and a wastewater tank 30. The slurry outlet of the first primary clarification tank 141 is connected to the feed inlet of the filter press 29. In this embodiment, the slurry generated in the first primary clarification tank 141 is treated by the filter press 29. The liquid outlet of the filter press 29 is connected to the liquid inlet of the wastewater tank 30, and the liquid outlet of the wastewater tank 30 is connected to the first primary clarification tank 141. White mud is discharged from the slurry outlet of the filter press 29.

[0052] Furthermore, the wastewater treatment system provided in this embodiment also includes a first centrifuge 31, a second centrifuge 32, a first mixing tank 33, an intermediate tank 34, a greywater reuse pipeline 35, a second mixing tank 36, a direct water supply pipeline 37, a buffer tank 38, and a low-chlorine white mud tank 39. The pump set 25 also includes a slurry pump 253. The slurry outlet of the second primary clarification tank 142 is connected to the feed inlet of the first centrifuge 31. The discharge outlet of the first centrifuge 31 and the greywater reuse pipeline 35 are both connected to the feed inlet of the first mixing tank 33. The discharge port of the first mixing tank 33 is connected to the liquid inlet of the intermediate tank 34, the liquid outlet of the intermediate tank 34 is connected to the feed inlet of the second centrifuge 32, the discharge port of the second centrifuge 32 and the direct water supply pipeline 37 are both connected to the feed inlet of the second mixing tank 36, the discharge port of the second mixing tank 36 is connected to the feed inlet of the buffer tank 38, the discharge port of the buffer tank 38 is connected to the feed inlet of the low-chlorine white mud tank, and the discharge port of the low-chlorine white mud tank is equipped with a slurry pump 253 to transport low-chlorine white mud to the outside.

[0053] Optionally, in this embodiment, both the first centrifuge 31 and the second centrifuge 32 are horizontal screw centrifuges.

[0054] Optionally, in this embodiment, both the waste liquid tank 16 and the second clarification tank 20 are sealed containers to prevent acidic gases from evaporating into the environment after the acid is added. The first flow meter 40, the second flow meter 41, and the third flow meter 43 are all electromagnetic flow meters.

[0055] This embodiment provides a wastewater treatment system for treating alkaline wastewater from a soda ash plant. It ensures that soda ash production is maintained even when carbon dioxide supply is insufficient, preventing a drop in soda ash production due to inadequate carbon dioxide supply and thus guaranteeing the plant's production efficiency.

[0056] For example, a soda ash plant obtains and compresses carbon dioxide gas from a neighboring power plant using medium-pressure steam and two large electric compressors. Due to insufficient steam from the power plant, the carbonation system in the heavy soda ash workshop often experiences insufficient carbon dioxide gas, leading to reduced production. The wastewater treatment system provided in this embodiment can reduce the demand for carbon dioxide gas in the wastewater treatment system by adding acid when the overall supply of carbon dioxide gas in the soda ash plant is insufficient. This ensures the supply of carbon dioxide gas to the carbonation system in the heavy soda ash workshop, thereby guaranteeing the soda ash production of the soda ash plant while ensuring the wastewater treatment effect and improving the plant's production efficiency.

[0057] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A wastewater treatment system, characterized in that, It includes a neutralization tower, a carbon dioxide supply pipeline, a wastewater discharge pipeline, a primary clarification tank, a first mixing tank, a waste liquid tank, an acid tank, a first acid supply pipeline, a first flow meter, a second flow meter, a first regulating valve, a third flow meter, and a second regulating valve; Both the carbon dioxide supply pipeline and the wastewater discharge pipeline are connected to the neutralization tower. A first flow meter is installed on the wastewater discharge pipeline, and a first regulating valve and a second flow meter are installed on the carbon dioxide supply pipeline. The drain outlet of the neutralization tower is connected to the primary clarification tank, and the liquid outlet of the primary clarification tank is connected to the waste liquid tank. A first mixing tank is provided on the connecting pipeline between the neutralization tower and the primary clarification tank, and a flocculant addition port is provided on the first mixing tank; The outlet of the acid tank is connected to the inlet of the waste liquid tank via the first acid supply pipeline. The first acid supply pipeline is equipped with a second regulating valve and a third flow meter.

2. The wastewater treatment system according to claim 1, characterized in that, It also includes a flocculant tank and a flocculant supply pipeline, wherein the outlet of the flocculant tank is connected to the flocculant addition port of the first mixing tank via the flocculant supply pipeline.

3. The wastewater treatment system according to claim 1, characterized in that, It also includes a purified water tank and a second clarification tank. The outlet of the waste liquid tank is connected to the inlet of the purified water tank. The purified water tank is provided with a water purification agent addition port. The outlet of the purified water tank is connected to the inlet of the second clarification tank.

4. The wastewater treatment system according to claim 3, characterized in that, It also includes a water purification agent tank, a first water purification agent supply pipeline, and a third regulating valve. The outlet of the water purification agent tank is connected to the water purification bucket via the first water purification agent supply pipeline, and the third regulating valve is installed on the first water purification agent supply pipeline.

5. The wastewater treatment system according to claim 4, characterized in that, It also includes a second mixing tank, a second water purification agent supply pipeline, a first shut-off valve, and a fourth regulating valve. The outlet of the waste liquid tank is connected to the inlet of the second clarification tank, and the first shut-off valve and the second mixing tank are provided on the pipeline connecting the waste liquid tank and the second clarification tank. The outlet of the water purification agent tank is connected to the second mixing tank via the second water purification agent supply pipeline, and the fourth regulating valve is provided on the second water purification agent supply pipeline.

6. The wastewater treatment system according to claim 5, characterized in that, It also includes a pump set, which includes a first delivery pump and a second delivery pump. The first delivery pump is installed at the outlet of the waste liquid tank, and the second delivery pump is installed at the outlet of the water purification agent tank.

7. The wastewater treatment system according to claim 6, characterized in that, It also includes a second acid supply pipeline, a fifth regulating valve and a fourth flow meter. The outlet of the acid tank is connected to the second clarification tank via the second acid supply pipeline. The second acid supply pipeline is equipped with the fifth regulating valve and the fourth flow meter.

8. The wastewater treatment system according to claim 6, characterized in that, It also includes a sand separator, and the lower part of the neutralization tower is provided with a sludge outlet. The sludge outlet of the neutralization tower is connected to the sand separator, and the sand separator is provided with a liquid outlet and a sludge outlet.

9. The wastewater treatment system according to claim 8, characterized in that, It also includes a ground trough and a second shut-off valve. The outlet of the sand separator is connected to the inlet of the ground trough, the outlet of the ground trough is connected to the inlet of the neutralization tower, and is also connected to the first mixing tank. The second shut-off valve is provided on the connecting pipeline between the ground trough and the neutralization tower, as well as on the connecting pipeline between the ground trough and the first mixing tank.

10. The wastewater treatment system according to any one of claims 1-9, characterized in that, Multiple neutralization towers are provided, including a first neutralization tower and a second neutralization tower. Multiple primary clarification tanks are provided, including a first primary clarification tank and a second primary clarification tank. A mixing tank is provided in a one-to-one correspondence with the primary clarification tanks. The liquid outlet of the first neutralization tower is connected to the liquid inlet of the first primary clarification tank, and the liquid outlet of the second neutralization tower is connected to the liquid inlet of the second primary clarification tank.

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