Machine-made sand wastewater treatment and recycling system

Abstract

The utility model relates to a machine-made sand wastewater treatment and recycling system. The method is suitable for the technical field of machine-made sand washing wastewater treatment. According to the technical scheme, the system comprises a hardening and tempering unit capable of receiving wastewater of different concentrations generated by sand washing workshops, mixing the wastewater and then carrying out homogenization pretreatment; the precipitation unit comprises an automatic dosing assembly and a thickening tank assembly, the input end of the automatic dosing assembly is connected with the tempering unit, and the output end of the automatic dosing assembly is connected with the thickening tank assembly; the sludge conveying and dewatering unit is connected to the first output end of the thickening tank assembly, and the sludge conveying and dewatering unit can conduct dewatering treatment on sludge obtained through wastewater sedimentation treatment; the input end of the recycling unit is connected to the second output end of the thickening tank assembly and the drainage end of the sludge conveying and dewatering unit, and the recycling unit can collect filtrate obtained by wastewater precipitation treatment and filtrate obtained by sludge dewatering.

Description

Technical Field

[0001] The utility model relates to the technical field of machine-made sand washing wastewater treatment, in particular to a machine-made sand wastewater treatment and reuse system. Background Art

[0002] During the processing of machine-made sand into construction aggregates, the screening and washing of the aggregates generate a large amount of flushing wastewater, characterized by high volume and turbidity. While there are no unified design standards for this industry in China, practitioners have conducted extensive research and discussion on the treatment and reuse of machine-made sand wastewater, achieving considerable success.

[0003] Chinese patent document CN 109052688A discloses a sand and gravel wastewater treatment system and method. Chinese patent document CN 217323681U discloses a novel sand washing wastewater treatment system. Chinese patent document CN117069317A discloses a wastewater treatment system and method for sand and gravel processing. Based on actual conditions, the above technologies still have the following deficiencies:

[0004] (1) Ordinary horizontal flow / radial flow sedimentation tanks have low surface loads, occupy a large area, have low sedimentation efficiency, require large amounts of chemicals, and have unstable effluent quality;

[0005] (2) The SS concentration of wastewater generated by different sand washing workshops varies greatly, resulting in large fluctuations in the operating load of the sedimentation equipment, which in turn leads to uneven dosing and unstable effluent water quality;

[0006] (3) The control of the dosage of the sedimentation unit is not rigorous enough, which affects the quality of the sludge and thus limits its reuse;

[0007] (4) There is no temporary storage device for mud cake at the bottom of the filter press, and mud cake is mostly transported by car. When the car breaks down or fails to return to the filter press mud cake area on time due to other reasons, the mud cake needs to be unloaded on the ground and shoveled to the transport vehicle for the second time by a forklift;

[0008] (5) The air compression system used for the filter press is not dehumidified, resulting in poor compressed air quality and affecting the service life of the equipment;

[0009] (6) The selection of recycled water pumps ignores the flow and pressure requirements of water-using equipment, resulting in the need to add secondary boosting equipment to some high-pressure water-using equipment, which is not conducive to equipment operation and maintenance. Utility Model Content

[0010] The technical problem to be solved by the utility model is: to provide a machine-made sand wastewater treatment and reuse system in response to the above-mentioned problems.

[0011] The technical solution adopted by the utility model is: a machine-made sand wastewater treatment and reuse system, which is characterized by comprising:

[0012] The conditioning unit can receive wastewater of different concentrations generated by each sand washing workshop and perform homogenization pretreatment after mixing;

[0013] The sedimentation unit includes an automatic dosing component and a thickening tank component. The input end of the automatic dosing component is connected to the conditioning unit, and the output end of the automatic dosing component is connected to the thickening tank component. The automatic dosing component can automatically add drugs to the wastewater after homogenization pretreatment, so that the wastewater is flocculated to reduce turbidity. The thickening tank component can precipitate the flocculated wastewater.

[0014] a sludge conveying and dehydration unit connected to the first output end of the thickening tank assembly, the sludge conveying and dehydration unit being capable of dehydrating the sludge obtained from the wastewater sedimentation treatment;

[0015] The recycling unit has an input end connected to the second output end of the thickening tank assembly and the drainage end of the sludge conveying and dehydration unit. The recycling unit can collect the filtrate obtained from the wastewater sedimentation treatment and the filtrate obtained from the sludge dehydration.

[0016] Through the above-mentioned technical means, the automatic dosing component and the thickening tank component are combined into a sedimentation unit. The thickening tank component is used to integrate radial flow sedimentation and vertical flow sedimentation, which greatly improves the hydraulic load and reduces the footprint of the sedimentation equipment. The automatic dosing component is used to adaptively and automatically dosing the homogenized pretreated wastewater, thereby improving the sedimentation efficiency of the thickening tank component.

[0017] In some embodiments, the thickening tank assembly includes a thickening tank body, a flow stabilizing material distribution barrel, a toothed overflow weir, a water collecting ditch, a guide rod, a scraper and a pillar. The top of the thickening tank body is provided with the flow stabilizing material distribution barrel located on the central axis, the top of the thickening tank body is provided with a water inlet connected to the flow stabilizing material distribution barrel, the toothed overflow weir is provided on the periphery of the flow stabilizing material distribution barrel, the outer periphery of the toothed overflow weir is provided with a water collecting ditch, the top of the thickening tank body is provided with a drain outlet connected to the water collecting ditch, the interior of the thickening tank body is provided with the guide rod and the scraper, the inner bottom of the thickening tank body is provided with a mud discharge port, and the bottom of the thickening tank body is provided with the pillar.

[0018] In some embodiments, a railing is provided on the top of the thickening tank body, and an inspection ladder is provided on the outer wall of the thickening tank body.

[0019] In some embodiments, the conditioning unit includes a wastewater conditioning tank, an agitator and a wastewater lifting pump. The sand washing wastewater of different concentrations generated by each sand washing workshop is transported to the wastewater conditioning tank through a collection pipe. The wastewater conditioning tank is provided with the agitator capable of homogenizing the wastewater. The outlet end of the wastewater conditioning tank is connected to the automatic dosing component through the wastewater lifting pump.

[0020] In some embodiments, the automatic dosing component includes a three-tank automatic dosing device and a pipeline mixer, the first input end of the pipeline mixer is connected to the tempering unit, the second input end of the pipeline mixer is connected to the three-tank automatic dosing device, and the output end of the pipeline mixer is connected to the thickening tank assembly. The three-tank automatic dosing device can automatically add PAM agent based on the turbidity of the inlet and outlet water of the thickening tank assembly, so that the tempered and homogenized sand washing wastewater is mixed with the PAM agent in the pipeline mixer.

[0021] In some embodiments, the sludge conveying and dewatering unit includes a sludge discharge pump, a sludge buffer tank, a filter press feed pump, a high-pressure diaphragm filter press, an air storage tank and an air compressor. The first output end of the thickening tank assembly is connected to the input end of the sludge buffer tank via the sludge discharge pump, the output end of the sludge buffer tank is connected to the mud inlet end of the high-pressure diaphragm filter press via the filter press feed pump, the air inlet end of the high-pressure diaphragm filter press is connected to the air compressor via the air storage tank, the mud discharge end of the high-pressure diaphragm filter press is provided with a mud storage hopper, and the drainage end of the high-pressure diaphragm filter press is connected to the input end of the reuse unit via a first pipeline.

[0022] In some embodiments, the drainage end of the high-pressure membrane filter press is connected to the input end of the conditioning unit via a second pipeline, and a switching valve is provided on both the first pipeline and the second pipeline;

[0023] If the turbidity of the filtrate generated by the high-pressure diaphragm filter press is lower than the preset turbidity value, the switching valve on the first pipeline is opened and the switching valve on the second pipeline is closed, so that the filtrate discharged from the drainage end is transported to the reuse unit; if the turbidity of the filtrate generated by the high-pressure diaphragm filter press is higher than the preset turbidity value, the switching valve on the first pipeline is closed and the switching valve on the second pipeline is opened, so that the filtrate discharged from the drainage end is transported to the conditioning unit.

[0024] In some embodiments, a cold dryer is provided between the gas storage tank and the air compressor, and the cold dryer can cool and dehumidify the compressed air generated by the air compressor and then store it in the gas storage tank.

[0025] In some embodiments, the reuse unit includes a reuse water tank, a high-pressure water pump and a low-pressure water pump. The input end of the reuse water tank is connected to the second output end of the thickening tank assembly and the drainage end of the sludge conveying and dehydration unit. The output end of the reuse water tank is connected to the high-pressure water point of each sand washing workshop through the high-pressure water pump, and the output end of the reuse water tank is connected to the low-pressure water point of each sand washing workshop through the low-pressure water pump.

[0026] The beneficial effects of the utility model are:

[0027] 1. By combining an automatic dosing assembly with a thickening tank assembly to form a sedimentation unit, the thickening tank assembly utilizes the characteristics of combining radial flow and vertical flow sedimentation. Compared with horizontal flow / radial flow sedimentation tanks, this significantly increases the hydraulic load and reduces the footprint of the sedimentation equipment. The thickening tank assembly adopts an above-ground steel structure, which is convenient for on-site construction. At the same time, due to the improved sedimentation efficiency, combined with the automatic dosing assembly, the dosage of the dosing can be minimized, saving operating costs, significantly reducing the drug content of the tailings, and improving the utilization quality of the tailings.

[0028] 2. The SS content of wastewater generated by different sand washing workshops varies greatly. The wastewater generated by each sand washing workshop is homogenized and pre-treated through the conditioning unit, and then the homogenized wastewater is passed into the sedimentation unit to ensure that the automatic dosing component can more accurately control the dosage of the dosing, ensuring the water quality of the effluent while avoiding excessive precipitation of the agent in the tailings, which affects the reuse quality of the tailings.

[0029] 3. Through the three-tank automatic dosing device in the automatic dosing component, the three-tank automatic dosing device can automatically add chemicals based on the turbidity and flow of the inlet and outlet water of the thickening tank component, so that the amount of chemicals in the thickening tank component can be effectively controlled to ensure the sludge quality.

[0030] 4. By setting up a mud storage hopper at the mud discharge end of the high-pressure diaphragm filter press, the dehydrated mud cake is temporarily stored in the mud storage hopper, which reduces the transportation load of the transport vehicle during operation and does not need to be discharged directly to the ground, avoiding the poor sanitation caused by secondary shoveling by a forklift.

[0031] 5. By dehumidifying the compressed air generated by the air compressor through a cold dryer, most of the moisture and humidity are removed from the compressed air after cold drying, greatly reducing the risk of corrosion to the gas storage tank, high-pressure diaphragm filter press and gas pipe valve, thereby increasing the service life of the equipment.

[0032] 6. By setting high and low pressure water supply at the outlet of the reuse water pool, the water supply equipment can be arranged in a centralized manner. There is no need to match the high-pressure water equipment with a booster pump, which avoids the scattered arrangement of equipment and is beneficial to the subsequent operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the process flow of this application.

[0034] Figure 2 It is a structural schematic diagram of the thickening tank assembly in this application.

[0035] Description of reference numerals:

[0036] 1. Wastewater conditioning tank; 2. Agitator; 3. Wastewater lifting pump; 4. Three-tank automatic dosing device; 5. Pipeline mixer; 6. Thickening tank assembly; 7. Mud discharge pump; 8. Sludge buffer tank; 9. Filter press feed pump; 10. High-pressure diaphragm filter press; 11. Mud storage hopper; 12. Air storage tank; 13. Cold dryer; 14. Air compressor; 15. Switching valve; 16. Recycled water tank; 17. High-pressure water pump; 18. Low-pressure water pump; 19. Water inlet; 20. Flow-stabilizing bucket; 21. Handrail; 22. Maintenance ladder; 23. Guide rod; 24. Sludge scraper; 25. Toothed overflow weir; 26. Drainage ditch; 27. Drainage outlet; 28. Pillar.

[0037] This specification includes references to "one embodiment" or "an embodiment." The appearance of the phrase "in one embodiment" or "in an embodiment" does not necessarily refer to the same embodiment. The particular features, structures, or characteristics may be combined in any suitable manner consistent with the present disclosure.

[0038] The term "comprising" is open ended. As used in the appended claims, the term does not exclude additional structures or steps.

[0039] “First,” “second,” etc. As used herein, these terms act as labels for the nouns that precede them and do not imply any type of ordering (e.g., spatial, temporal, logical, etc.).

[0040] As used herein, the term "based on" is used to describe one or more factors that influence a determination. This term does not exclude additional factors that influence the determination. That is, the determination may be based solely on these factors, or at least in part on these factors. Consider the phrase "A is determined based on B." In this case, B is a factor that influences the determination of A, and such a phrase does not exclude that the determination of A may also be based on C. In other examples, A may be determined based solely on B. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with specific embodiments.

[0042] Combine Figures 1 to 2As shown, this embodiment is a system for treating and reusing machine-made sand wastewater. It includes a conditioning unit, a sedimentation unit, a sludge conveying and dewatering unit, and a recycling unit. The sedimentation unit includes an automatic dosing assembly and a thickening tank assembly 6. The conditioning unit receives wastewater of varying concentrations from each sand washing workshop and performs homogenization pretreatment after mixing. The output of the conditioning unit is connected to the thickening tank assembly 6 via an automatic dosing assembly. The automatic dosing assembly automatically adds chemicals to the wastewater after homogenization pretreatment, causing flocculation to reduce turbidity. The thickening tank assembly 6 then performs sedimentation on the flocculated wastewater. The first output of the thickening tank assembly 6 is connected to the sludge conveying and dewatering unit, which dewaters the sludge obtained from the wastewater sedimentation treatment. The second output of the thickening tank assembly 6 is connected to the recycling unit, which collects the filtrate obtained from the wastewater sedimentation treatment. The discharge end of the sludge conveying and dewatering unit is connected to the input of the recycling unit, which collects the filtrate obtained from the sludge dewatering.

[0043] In some embodiments, the conditioning unit includes a wastewater conditioning tank 1, an agitator 2, and a wastewater lift pump 3. Sand washing wastewater of varying concentrations generated by each sand washing workshop is transported to the wastewater conditioning tank 1 via a collection pipe. The agitator 2 is provided within the wastewater conditioning tank 1, and the outlet of the wastewater conditioning tank 1 is connected to an automatic dosing assembly via the wastewater lift pump 3. The agitator 2 fully homogenizes the sand washing wastewater of varying concentrations within the wastewater conditioning tank 1.

[0044] In some embodiments, the automatic dosing assembly includes a three-tank automatic dosing device 4 and a pipeline mixer 5. The first input end of the pipeline mixer 5 is connected to the wastewater lift pump 3, the second input end of the pipeline mixer 5 is connected to the three-tank automatic dosing device 4, and the output end of the pipeline mixer 5 is connected to the thickening tank assembly 6. The three-tank automatic dosing device 4 can achieve fully automatic PAM dosing. The pipeline is equipped with an online turbidity meter, flow meter, and other meters to monitor the turbidity and flow rate of the water entering and exiting the thickening tank assembly 6. The three-tank automatic dosing device 4 can adaptively adjust the dosage of the PAM in the conditioned and homogenized sand washing wastewater based on the turbidity and flow rate of the water entering and exiting the thickening tank assembly 6. This ensures that the conditioned and homogenized sand washing wastewater and the added PAM agent fully contact and mix within the pipeline mixer 5 before entering the thickening tank assembly 6. Specifically, the PAM preparation device in the three-tank automatic dosing device 4 can automatically add water, drug, and agitate the wastewater at low liquid levels based on liquid level gauge signals.

[0045] In some embodiments, as Figure 2As shown, the thickening tank assembly 6 includes a thickening tank body, a flow-stabilizing distribution barrel 20, a toothed overflow weir 25, a water collection ditch 26, a guide rod 23, a mud scraper 24, and a support 28. The top of the thickening tank body is provided with a flow-stabilizing distribution barrel 20 located on the central axis. The flow-stabilizing distribution barrel 20 can quickly stabilize the flow of high-velocity wastewater into the thickening tank body, providing good reaction conditions for flocculation and sedimentation. The top of the thickening tank body is provided with a water inlet 19 connected to the flow-stabilizing distribution barrel 20. The flow-stabilizing distribution barrel 20 is provided with a toothed overflow weir 25 on the periphery. The toothed overflow weir 25 is provided with a water collection ditch 26 on the periphery. The top of the thickening tank body is provided with a drain port 27 connected to the water collection ditch 26. The interior of the thickening tank body is provided with a flow-stabilizing distribution barrel 20 and a mud scraper 24. The inner bottom of the thickening tank body is provided with a mud discharge port. The bottom of the thickening tank body is provided with a support 28.

[0046] Furthermore, a railing 21 is provided on the top of the thickening tank body, and an inspection ladder 22 is provided on the outer wall of the thickening tank body. In this embodiment, the hydraulic load of the thickening tank body can reach 5.5m 3 / (m 2 h), significantly reducing the sedimentation equipment's footprint. The above-ground steel structure shortens construction time and eliminates vulnerable parts, eliminating the challenge of dredging during operation and maintenance. Because some thickeners have excessively high deep cone heights, this can easily lead to high sludge concentrations at the bottom, potentially clogging subsequent sludge conveying pipes, sludge pumps, and other equipment. In this embodiment, by controlling the deep cone height of the thickener, sedimentation efficiency can be improved to a certain extent, reducing the risk of clogging sludge conveying due to excessive sludge concentration. Typically, the sludge concentration within the thickener is controlled at around 30%.

[0047] The turbulent wastewater and reagent mixture is smoothly dispersed from the lower middle portion of the thickener body to the surrounding areas through the steady flow distribution barrel 20, where it flocculates and forms a cluster. When the particles grow to a certain weight, they settle to the bottom of the thickener body. Under the action of the scraper 24, the interstitial water in the sludge is agitated and diverted into the upper water via the guide rod 23, further concentrating the sludge. The concentrated sludge is then discharged from the conical mud outlet at the bottom, which is the first output end of the thickener assembly 6. The supernatant liquid is rectified by the toothed overflow weir 25 around the top of the thickener body and flows evenly into the annular sump 26. Finally, it is uniformly collected at the thickener outlet 27, which is the second output end of the thickener assembly 6, and flows through a pipeline to the reuse unit.

[0048] In some embodiments, the sludge conveying and dewatering unit includes a sludge discharge pump 7, a sludge buffer tank 8, a filter press feed pump 9, a high-pressure diaphragm filter press 10, an air storage tank 12 and an air compressor 14. The sludge discharge port of the thickening tank body is connected to the input end of the sludge buffer tank 8 via the sludge discharge pump 7, and the output end of the sludge buffer tank 8 is connected to the sludge inlet end of the high-pressure diaphragm filter press 10 via the filter press feed pump 9. The air inlet end of the high-pressure diaphragm filter press 10 is connected to the air compressor 14 via the air storage tank 12, and the sludge discharge end of the high-pressure diaphragm filter press 10 is provided with a sludge storage hopper 11. The drainage end of the high-pressure diaphragm filter press 10 is provided with a filtrate tank, which is used to collect the filtrate produced by the high-pressure diaphragm filter press 10 when squeezing the sludge. The filtrate tank is connected to the input end of the reuse unit via a first pipeline.

[0049] Furthermore, in this embodiment, the sludge buffer tank 8 adopts an above-ground closed structure, and the main body is made of steel structure material, which improves construction efficiency while avoiding the occurrence of "running, bubbling, dripping, and leaking" phenomena, greatly improving the operating environment of the plant.

[0050] The sludge at the bottom of the thickening tank body, with a moisture content of approximately 70%, is transported to the sludge buffer tank 8 via the sludge discharge pump 7. The sludge in the sludge buffer tank 8 is then transported to the high-pressure diaphragm filter press 10 via a pipeline via the filter press feed pump 9 for dehydration. The filter press feed pump 9 and the high-pressure diaphragm filter press 10 are matched in a "one-to-one" manner. The sludge is first mechanically squeezed and dehydrated in the filter chamber of the high-pressure diaphragm filter press 10, and then compressed air in the air storage tank 12 is introduced for secondary squeezing and dehydration. The high-pressure diaphragm filter press 10 uses a combination of mechanical squeezing and air squeezing to increase the solid content of the mud cake and reduce the output of the finished mud cake. The dehydrated mud cake (with a moisture content of approximately 30%) falls into the mud storage hopper 11. After the transport vehicle is in place, the discharge port of the mud storage hopper 11 is opened by a hydraulic rod, and the mud cake is unloaded onto the transport vehicle for transportation.

[0051] Furthermore, the filtrate tank is connected to the input end of the wastewater conditioning tank 1 via a second pipeline, and a switching valve 15 is provided on both the first pipeline and the second pipeline;

[0052] If the turbidity of the filtrate generated by the high-pressure diaphragm filter press 10 is lower than the preset turbidity value (100 mg / L), the switching valve 15 on the first pipeline is opened and the switching valve 15 on the second pipeline is closed, so that the filtrate discharged from the drainage end is transported to the reuse unit; if the turbidity of the filtrate generated by the high-pressure diaphragm filter press 10 is higher than the preset turbidity value, the switching valve 15 on the first pipeline is closed and the switching valve 15 on the second pipeline is opened, so that the filtrate discharged from the drainage end is transported to the wastewater conditioning tank 1.

[0053] By controlling the switching valves 15 on the first and second pipelines, the filtrate in the filtrate tank is collected via two pipelines, one leading to the reuse unit and the other to the wastewater conditioning tank 1. During normal operation, the filtrate has low turbidity and can be directly transported to the reuse unit. However, when the filtrate turbidity is high due to filter cloth cleaning or maintenance of the high-pressure diaphragm filter press 10, it can be switched to be transported to the wastewater conditioning tank 1.

[0054] Furthermore, a cold dryer 13 is provided between the gas storage tank 12 and the air compressor 14. The cold dryer 13 can cool and dehumidify the compressed air generated by the air compressor 14. The treated dry gas can be stored in the gas storage tank 12 for standby use, thereby minimizing the water content in the compressed air to ensure the service life of the gas storage tank 12 and the gas-using equipment.

[0055] In some embodiments, the recycling unit includes a recycling water tank 16, a high-pressure water pump 17, and a low-pressure water pump 18. The input end of the recycling water tank 16 is connected to the drain port 27 of the thickening tank body, and the input end of the recycling water tank 16 is connected to the filtrate tank of the high-pressure diaphragm filter press via a second pipeline. The recycling water tank 16 is also provided with a water supply pipe, which controls the opening and closing of the water supply valve according to the liquid level in the tank. The water source of the recycling water tank 16 mainly comes from the supernatant of the thickening tank, the water supply pipe, and the filtrate of the high-pressure diaphragm filter press 10. The output end of the recycling water tank 16 is connected to the high-pressure water point of each sand washing workshop via the high-pressure water pump 17, and the output end of the recycling water tank 16 is connected to the low-pressure water point of each sand washing workshop via the low-pressure water pump 18. The two types of water pumps can meet the water consumption of sand washing and meet the water pressure requirements of different sand washing workshops.

[0056] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A machine-made sand wastewater treatment and reuse system, characterized in that: include: The conditioning unit can receive wastewater of different concentrations generated by each sand washing workshop and perform homogenization pretreatment after mixing; The sedimentation unit comprises an automatic dosing component and a thickening tank component (6), wherein the input end of the automatic dosing component is connected to the conditioning unit, and the output end of the automatic dosing component is connected to the thickening tank component (6), the automatic dosing component can automatically dosing the wastewater after homogenization pretreatment, so that the wastewater is flocculated to reduce turbidity, and the thickening tank component (6) can perform sedimentation treatment on the flocculated wastewater; A sludge conveying and dehydration unit is connected to the first output end of the thickening tank assembly (6), and the sludge conveying and dehydration unit is capable of dehydrating the sludge obtained from the wastewater sedimentation treatment; A recycling unit, wherein the input end of the recycling unit is connected to the second output end of the thickening tank assembly (6) and the drainage end of the sludge conveying and dehydration unit, and the recycling unit can collect the supernatant obtained from the wastewater sedimentation treatment and the filtrate obtained from the sludge dehydration.

2. The machine-made sand wastewater treatment and reuse system according to claim 1, characterized in that: The thickening tank assembly (6) comprises a thickening tank body, a flow-stabilizing material distribution barrel (20), a toothed overflow weir (25), a water collecting ditch (26), a guide rod (23), a mud scraper (24) and a support (28). The top of the thickening tank body is provided with the flow-stabilizing material distribution barrel (20) located on the central axis. The top of the thickening tank body is provided with a water inlet (19) connected to the flow-stabilizing material distribution barrel (20). The toothed overflow weir (25) is provided on the periphery of the flow-stabilizing material distribution barrel (20). The outer periphery of the toothed overflow weir (25) is provided with a water collecting ditch (26). The top of the thickening tank body is provided with a drain port (27) connected to the water collecting ditch (26). The inside of the thickening tank body is provided with the guide rod (23) and the mud scraper (24). The inner bottom of the thickening tank body is provided with a mud discharge port. The bottom of the thickening tank body is provided with the support (28).

3. The machine-made sand wastewater treatment and reuse system according to claim 2, characterized in that: A handrail (21) is provided on the top of the thickening tank body, and an inspection ladder (22) is provided on the outer wall of the thickening tank body.

4. The machine-made sand wastewater treatment and reuse system according to claim 1 is characterized by: The conditioning unit comprises a wastewater conditioning tank (1), an agitator (2) and a wastewater lifting pump (3); sand washing wastewater of different concentrations generated in each sand washing workshop is transported to the wastewater conditioning tank (1) via a collection pipe; the wastewater conditioning tank (1) is provided with the agitator (2) capable of homogenizing the wastewater; the outlet end of the wastewater conditioning tank (1) is connected to the automatic dosing component via the wastewater lifting pump (3).

5. The machine-made sand wastewater treatment and reuse system according to claim 1 is characterized by: The automatic dosing component comprises a three-tank automatic dosing device (4) and a pipeline mixer (5), wherein a first input end of the pipeline mixer (5) is connected to the conditioning unit, a second input end of the pipeline mixer (5) is connected to the three-tank automatic dosing device (4), and an output end of the pipeline mixer (5) is connected to the thickening tank component (6). The three-tank automatic dosing device (4) can automatically add PAM reagent based on the turbidity of the inlet and outlet water of the thickening tank component (6), so that the conditioned and homogenized sand washing wastewater and the PAM reagent are mixed in the pipeline mixer (5).

6. The machine-made sand wastewater treatment and reuse system according to claim 1, characterized in that: The sludge conveying and dewatering unit includes a sludge discharge pump (7), a sludge buffer tank (8), a filter press feed pump (9), a high-pressure diaphragm filter press (10), an air storage tank (12) and an air compressor (14); the first output end of the thickening tank assembly (6) is connected to the input end of the sludge buffer tank (8) via the sludge discharge pump (7); the output end of the sludge buffer tank (8) is connected to the sludge inlet end of the high-pressure diaphragm filter press (10) via the filter press feed pump (9); the air inlet end of the high-pressure diaphragm filter press (10) is connected to the air compressor (14) via the air storage tank (12); the sludge discharge end of the high-pressure diaphragm filter press (10) is provided with a sludge storage hopper (11); and the drainage end of the high-pressure diaphragm filter press (10) is connected to the input end of the reuse unit via a first pipeline.

7. The machine-made sand wastewater treatment and reuse system according to claim 6, characterized in that: The drainage end of the high-pressure membrane filter press (10) is connected to the input end of the conditioning unit via a second pipeline, and a switching valve (15) is provided on both the first pipeline and the second pipeline; If the turbidity of the filtrate generated by the high-pressure diaphragm filter press (10) is lower than the preset turbidity value, the switching valve (15) on the first pipeline is opened and the switching valve (15) on the second pipeline is closed, so that the filtrate discharged from the drainage end is transported to the reuse unit; if the turbidity of the filtrate generated by the high-pressure diaphragm filter press (10) is higher than the preset turbidity value, the switching valve (15) on the first pipeline is closed and the switching valve (15) on the second pipeline is opened, so that the filtrate discharged from the drainage end is transported to the conditioning unit.

8. The machine-made sand wastewater treatment and reuse system according to claim 6, characterized in that: A cold dryer (13) is provided between the gas storage tank (12) and the air compressor (14). The cold dryer (13) can cool and dehumidify the compressed air generated by the air compressor (14) and then store it in the gas storage tank (12).

9. The machine-made sand wastewater treatment and reuse system according to claim 1, characterized in that: The reuse unit includes a reuse water tank (16), a high-pressure water pump (17) and a low-pressure water pump (18). The input end of the reuse water tank (16) is connected to the second output end of the thickening tank assembly (6) and the drainage end of the sludge conveying and dehydration unit. The output end of the reuse water tank (16) is connected to the high-pressure water points of each sand washing workshop through the high-pressure water pump (17), and the output end of the reuse water tank (16) is connected to the low-pressure water points of each sand washing workshop through the low-pressure water pump (18).

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