Sewage zero-discharge treatment system for concrete mixing plant

Abstract

The utility model relates to the technical field of concrete mixing plants, in particular to a sewage zero-discharge treatment system for a concrete mixing plant. The system comprises a sand-stone separation loop, a slurry treatment loop and a zero-emission treatment loop, wherein the sand-stone separation loop comprises a discharge chute, a sand-stone separator and a grit chamber which are arranged in sequence; a cyclone is arranged in the discharge chute; the slurry treatment loop comprises a stirring tank and a finished product slurry tank which are arranged in sequence; one end of the stirring tank is connected with a clean water tank through a water pump and connected with a discharge chute through a cyclone, and the other end of the stirring tank is connected with a finished product slurry tank; the finished product slurry tank is connected with a sewage scale through a pipeline, and a concentration tester device is arranged above the finished product slurry tank; the zero-emission treatment loop comprises a control cabinet; and the control cabinet is connected with the sand-stone separation loop and the slurry treatment loop respectively. According to the utility model, the problems that various wastes and mortar water on the site of the mixing plant exceed the standard and pollute the environment are solved, and controllable sewage, adjustable concentration and resource recycling are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete mixing stations, in particular to a sewage zero-discharge treatment system for a concrete mixing station. Background Art

[0002] The water treatment system has become an indispensable equipment in the concrete mixing station. After each delivery, there must be a part of the residual concrete in the tank truck, and the cleaning will inevitably produce mortar water; in addition, the concrete mixing station produces a part of concrete that does not meet the grade for various reasons, and a large amount of mortar water is also produced during the cleaning; when the waste collected from other places in the concrete mixing station is cleaned and the mixing station site is flushed, a part of sewage is also produced; all of the above sewage is treated by the sewage treatment system before being discharged and recycled. In order to solve the above technical problems, the technicians in this field have made the following efforts. For example, the Chinese patent, the authorization announcement number is CN218687274U, which discloses a sand and gravel separation sewage treatment system, which realizes the separation of sand and gravel from sewage, and the sand and gravel and water obtained can be recycled. However, the amount of sewage generated in the production process of the mixing station of the above scheme is large, the concentration is high, it is not easy to control, and the percentage of mortar contained does not meet the industry emission standards, and the fine sand in the waste cannot be effectively utilized. Utility Model Content

[0003] The technical problem to be solved by the utility model is: to overcome the shortcomings of the existing technology, to provide a zero-discharge treatment system for sewage from a concrete mixing station, to solve the problem of excessive discharge of various waste materials and mortar water at the mixing station site and environmental pollution, to achieve controllable sewage, adjustable concentration, and resource recycling and reuse.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A zero-discharge treatment system for sewage in a concrete mixing station includes a sand and gravel separation circuit, a slurry treatment circuit, and a zero-discharge treatment circuit, wherein:

[0006] The sand and gravel separation circuit includes a discharge trough, a sand and gravel separator and a grit chamber which are arranged in sequence; a cyclone is built into the discharge trough, one end of which is connected to the grit chamber through a pump, and the sewage in the grit chamber is treated by the cyclone, and the fine sand falls into the top of the discharge trough; the other end of the cyclone is connected to the mixing tank through a pipeline;

[0007] The slurry treatment loop includes a stirring tank and a finished slurry tank which are arranged in sequence; one end of the stirring tank is connected to a discharge tank through a cyclone, and the other end of the stirring tank is connected to the finished slurry tank; the finished slurry tank is connected to a sewage scale through a pipeline, and a concentration tester device is arranged above the finished slurry tank;

[0008] The zero-emission processing circuit includes a control cabinet, and the control cabinet is connected to the sand and gravel separation circuit and the slurry processing circuit respectively.

[0009] This technical solution realizes the comprehensive treatment and utilization of waste materials from concrete mixing plants, including a sand and gravel separation circuit, a slurry treatment circuit and a zero-emission treatment circuit, aiming to recycle and reuse the fine sand in the sewage generated by the concrete mixing plant, while avoiding the pollution to the environment caused by direct discharge of sewage. The sand and gravel in the waste materials are separated by a sand and gravel separator, and the fine sand and slurry water are treated by a cyclone. The slurry water enters the mixing tank and the finished slurry tank, and after concentration adjustment and reuse, it finally realizes zero sewage discharge and recycling of resources. In addition, the system is also equipped with a control cabinet to ensure the automation and efficiency of the entire treatment process. Specifically, the discharge trough is the entrance for sewage and sand and gravel, and has a built-in cyclone for preliminary sewage treatment; the cyclone uses centrifugal force to separate fine sand from sewage. Due to its high density, the fine sand is deposited on the top of the discharge trough under the action of centrifugal force, while the slurry water flows out through the other end of the cyclone; the mixing tank receives the slurry water flowing out of the cyclone, ready to enter the slurry treatment circuit; the slurry treatment circuit uses the slurry water extracted from the sand and gravel separation circuit and the required additional clean water to produce finished slurry that meets the requirements; the finished slurry tank stores the prepared slurry, and monitors the concentration of the slurry through the concentration tester device above to ensure that it meets the use requirements; the sewage scale is connected to the finished slurry tank through a pipeline to measure or control the production of the slurry; the control cabinet collects real-time data (such as flow, concentration, etc.) from the sand and gravel separation circuit and the slurry treatment circuit, and remotely controls equipment such as water pumps and stirring devices to ensure efficient operation of the system and zero discharge of sewage. This technical solution separates fine sand from sewage through a sand and gravel separation circuit. The sewage enters the slurry treatment circuit for slurry production, while the fine sand is recycled as a resource. The zero-emission treatment circuit monitors and controls the entire system through a control cabinet to ensure stable operation of the system and zero discharge of sewage, which not only reduces pollution to the environment but also improves resource utilization efficiency.

[0010] In addition, the above-mentioned concrete mixing station wastewater zero discharge treatment system proposed by the utility model also has the following additional technical features:

[0011] According to an embodiment of the utility model, the unloading trough is a designated position in front of the concrete tank truck for unloading, and the concrete tank truck pours the remaining waste materials and water into the unloading trough.

[0012] In this technical solution, the discharge chute collects waste in a centralized manner to reduce the impact on the environment; the discharge chute is placed in a designated location to prevent waste from splashing or scattering in other places, thereby keeping the working environment clean and orderly.

[0013] According to one embodiment of the utility model, the sand and gravel separator is connected to a discharge trough for receiving waste material flushed down from the discharge trough; the sand and gravel separator is respectively connected to a sand bin and a stone bin, which are respectively used to store sand and gravel separated from the sand and gravel separator.

[0014] This technical solution recycles and reuses the sand and gravel in concrete waste that was originally regarded as waste through a sand and gravel separator, greatly reducing the waste of resources; the separated sand and gravel are transported to the sand silo and stone silo for storage respectively, ensuring the rational use of resources.

[0015] According to one embodiment of the utility model, the grit chamber is connected to a sand and gravel separator, and is used to receive sewage containing fine sand discharged from the sand and gravel separator.

[0016] This technical solution achieves effective separation of sand and water in sewage through sedimentation, achieving the purpose of purifying sewage, recycling resources and stabilizing the system, while meeting environmental protection requirements. The grit chamber serves as a buffer between the sand and gravel separator and the slurry treatment circuit, playing a role in stabilizing the system. By accommodating a certain amount of sand-containing sewage, it ensures that the system can still maintain stable operation when the sand and gravel separator is running continuously or the processing volume fluctuates.

[0017] According to an embodiment of the utility model, one end of the sewage scale receives the slurry drawn from the finished slurry tank, and the other end feeds the weighed and metered slurry into the mixing main unit.

[0018] This technical solution ensures that the use of sewage in the production process of the concrete mixing plant is optimized and waste is avoided through accurate measurement and control of sewage scales; the reuse of sewage also reduces the consumption of water resources in the production process, thereby improving production efficiency and reducing costs.

[0019] According to an embodiment of the utility model, the concentration tester device is installed above the finished product slurry tank to measure the concentration of the slurry.

[0020] This technical solution uses the precise measurement of the concentration tester to accurately calculate the amount of water or other additives required to achieve the desired slurry concentration; through real-time measurement, changes in slurry concentration can be discovered in a timely manner, so that corresponding measures can be taken to adjust production parameters to ensure high efficiency, accuracy and reliability in the production process of the concrete mixing plant.

[0021] According to one embodiment of the utility model, the slurry processing circuit is also provided with a stirring device, a pneumatic butterfly valve and a liquid level meter; the stirring device and the liquid level meter are both arranged in the stirring tank and the finished slurry tank, and the stirring device, the pneumatic butterfly valve and the liquid level meter are respectively connected to the control cabinet for controlling the stirring action, the pneumatic butterfly valve switch and the liquid level detection.

[0022] In this technical solution, the stirring device is arranged in the stirring tank and the finished slurry tank to ensure the uniformity and stability of the slurry. The stirring device fully mixes the solid particles and liquid in the slurry by rotating or stirring blades, etc., to prevent precipitation and stratification, and ensure the uniformity of the slurry; the signal is sent through the control cabinet, and the level meter is used to monitor the slurry level in the stirring tank and the finished slurry tank in real time, and the slurry inventory in the tank is detected by the level meter; the level meter is also connected to the control cabinet to realize automatic alarm and shutdown functions. When the liquid level is too high or too low, stirring or conveying is automatically stopped to prevent equipment damage or production accidents.

[0023] According to an embodiment of the utility model, the slurry processing circuit is further provided with an air compressor, and the air compressor is connected to the pneumatic butterfly valve to provide an air source for the pneumatic butterfly valve.

[0024] In this technical solution, the air compressor is used to provide compressed air to drive the pneumatic butterfly valve. In addition, there is also an air source point for controlling the operation of the pneumatic butterfly valve.

[0025] According to one embodiment of the utility model, the pneumatic butterfly valve is arranged at the bottom of the mixing tank and the finished product slurry tank, and the high-concentration sewage accumulated under the mixing tank and the finished product slurry tank for a long time is circulated to the sand settling tank, and then re-enters the mixing tank after being treated by the cyclone.

[0026] In this technical solution, when the materials in the mixing tank and the finished slurry tank are stationary for a long time or are insufficiently stirred, the solid particles or heavy substances settle to the bottom of the tank. If the high-concentration sewage accumulated for a long time is not discharged in time, it will affect the quality of the materials in the tank or cause pipeline blockage. The pneumatic butterfly valve can be opened to discharge the high-concentration sewage accumulated for a long time into the sand settling tank.

[0027] Compared with the prior art, the utility model has the following beneficial effects:

[0028] The utility model realizes the recycling of sand and gravel, the recycling of fine sand, the controllable and adjustable sewage and zero emission, and the recycling of waterways, which is more in line with the environmental protection concept of saving resources and becomes an indispensable environmental protection product for mixing stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the utility model.

[0030] Figure 2 It is a principle connection block diagram of the utility model.

[0031] In the figure: 1. Discharge chute; 2. Sand and gravel separator; 3. Grit chamber; 4. Cyclone; 5. Mixing tank; 6. Finished product slurry tank; 7. Mixing device; 8. Water pump; 9. Pneumatic butterfly valve; 10. Air compressor; 11. Concentration tester device; 12. Liquid level meter; 13. Pipeline; 14. Sewage scale; 15. Clear water tank; 16. Sand bin; 17. Stone bin; 18. Control cabinet. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] Example 1

[0034] like Figure 1 and Figure 2 As shown, this embodiment provides a zero-discharge treatment system for sewage in a concrete mixing station, including a sand and gravel separation circuit, a slurry treatment circuit, and a zero-discharge treatment circuit, wherein:

[0035] The sand and gravel separation circuit includes a discharge trough 1, a sand and gravel separator 2 and a grit chamber 3 which are arranged in sequence; the discharge trough 1 is equipped with a cyclone 4, one end of which is connected to the grit chamber 3 through a pump, and the sewage in the grit chamber 3 is processed by the cyclone 4, and the fine sand falls into the upper part of the discharge trough 1; the other end of the cyclone 4 is connected to the mixing tank 5 through a pipeline 13;

[0036] The slurry treatment circuit includes a stirring tank 5 and a finished slurry tank 6 which are arranged in sequence; one end of the stirring tank 5 is connected to the discharge tank 1 through a cyclone 4, and the other end of the stirring tank 5 is connected to the finished slurry tank 6; the finished slurry tank 6 is connected to a sewage scale 14 through a pipeline 13, and a concentration tester device 11 is arranged above the finished slurry tank 6;

[0037] The zero-emission processing circuit includes a control cabinet 18, and the control cabinet 18 is connected to the sand and gravel separation circuit and the slurry processing circuit respectively.

[0038] like Figure 1 and Figure 2As shown, the technical solution realizes the comprehensive treatment and utilization of waste materials from the concrete mixing station, including a sand and gravel separation circuit, a slurry treatment circuit and a zero-emission treatment circuit, aiming to recycle and reuse the fine sand in the sewage generated by the concrete mixing station, while avoiding the pollution to the environment caused by direct discharge of sewage; the sand and gravel in the waste materials are separated by the sand and gravel separator 2, and the fine sand and slurry water are treated by the cyclone 4, and the slurry water enters the mixing tank 5 and the finished slurry tank 6, and after concentration adjustment and reuse, zero sewage discharge and recycling of resources are finally realized; in addition, the system is also equipped with a control cabinet 18 to ensure the automation and efficiency of the entire treatment process. Specifically, the discharge trough 1 is the entrance for sewage and sand and gravel, and has a built-in cyclone 4 for preliminary treatment of sewage; the cyclone 4 uses centrifugal force to separate fine sand from sewage in the sewage. Due to its large density, the fine sand is deposited above the discharge trough 1 under the action of centrifugal force, while the slurry flows out through the other end of the cyclone 4; the mixing tank 5 receives the slurry flowing out of the cyclone 4 and prepares to enter the slurry treatment circuit; the slurry treatment circuit uses the slurry extracted from the sand and gravel separation circuit and the required additional clean water to produce finished slurry that meets the requirements; the finished slurry tank 6 stores the prepared slurry and monitors the concentration of the slurry through the concentration tester device 11 above to ensure that it meets the use requirements; the sewage scale 14 is connected to the finished slurry tank 6 through the pipeline 13 for measuring or controlling the production of the slurry; the control cabinet 18 collects real-time data (such as flow rate, concentration, etc.) from the sand and gravel separation circuit and the slurry treatment circuit, and remotely controls the water pump 8, the stirring device 7 and other equipment to ensure efficient operation of the system and zero discharge of sewage. This technical solution separates fine sand from sewage through a sand and gravel separation circuit. The sewage enters the slurry treatment circuit for producing slurry, while the fine sand is recycled as a resource. The zero-emission treatment circuit monitors and controls the entire system through a control cabinet 18 to ensure stable operation of the system and zero discharge of sewage, which not only reduces pollution to the environment but also improves resource utilization efficiency.

[0039] In addition, the above-mentioned concrete mixing station wastewater zero discharge treatment system proposed by the utility model also has the following additional technical features:

[0040] According to an embodiment of the utility model, the unloading trough 1 is a designated position in front of the concrete tank truck for unloading, and the concrete tank truck pours the remaining waste and water into the unloading trough 1.

[0041] In the technical solution, the discharge chute 1 reduces the impact on the environment by collecting waste in a centralized manner; the discharge chute 1 is placed in a designated location to prevent waste from splashing or scattering in other places, thereby keeping the working environment clean and orderly.

[0042] According to one embodiment of the utility model, the sand and gravel separator 2 is connected to the discharge trough 1 for receiving waste material flushed down from the discharge trough 1; the sand and gravel separator 2 is respectively connected to the sand bin 16 and the stone bin 17, and the sand bin 16 and the stone bin 17 are respectively used to store the sand and gravel separated from the sand and gravel separator 2.

[0043] This technical solution recycles and reuses the sand and gravel in the concrete waste that was originally regarded as waste through the sand and gravel separator 2, greatly reducing the waste of resources; the separated sand and gravel are transported to the sand bin 16 and the stone bin 17 for storage, respectively, to ensure the rational use of resources.

[0044] According to an embodiment of the utility model, the grit chamber 3 is connected to the sand and gravel separator 2 and is used to receive the sewage containing fine sand discharged from the sand and gravel separator 2 .

[0045] This technical solution realizes the effective separation of sand and water in sewage through sedimentation, achieves the purpose of purifying sewage, recycling resources and stabilizing the system, and meets environmental protection requirements. The sand settling tank 3 serves as a buffer device between the sand and gravel separator 2 and the slurry treatment circuit, plays a role in stabilizing the system, and by accommodating a certain amount of sand-containing sewage, ensures that the system can still maintain stable operation when the sand and gravel separator 2 is continuously running or the processing volume fluctuates.

[0046] According to an embodiment of the utility model, one end of the sewage scale 14 receives the slurry drawn from the finished slurry tank 6, and the other end allows the weighed and metered slurry to enter the mixing main unit.

[0047] This technical solution ensures that the use of sewage in the production process of the concrete mixing plant is optimized and waste is avoided through accurate measurement and control of the sewage scale 14; the reuse of sewage also reduces the consumption of water resources in the production process, thereby improving production efficiency and reducing costs.

[0048] According to an embodiment of the present invention, the concentration tester device 11 is installed above the finished product slurry tank 6 to measure the concentration of the slurry.

[0049] This technical solution uses the precise measurement of the concentration tester to accurately calculate the amount of water or other additives required to achieve the desired slurry concentration; through real-time measurement, changes in slurry concentration can be discovered in a timely manner, so that corresponding measures can be taken to adjust production parameters to ensure high efficiency, accuracy and reliability in the production process of the concrete mixing plant.

[0050] According to one embodiment of the utility model, the slurry processing circuit is also provided with a stirring device 7, a pneumatic butterfly valve 9 and a liquid level meter 12; the stirring device 7 and the liquid level meter 12 are both arranged in the stirring tank 5 and the finished slurry tank 6, and the stirring device 7, the pneumatic butterfly valve 9 and the liquid level meter 12 are respectively connected to the control cabinet 18 for controlling the stirring action, the switching of the pneumatic butterfly valve 9 and the liquid level detection.

[0051] In the present technical solution, the stirring device 7 is arranged in the stirring tank 5 and the finished slurry tank 6 to ensure the uniformity and stability of the slurry. The stirring device 7 fully mixes the solid particles and liquid in the slurry by rotating or stirring blades, etc., to prevent precipitation and stratification, and ensure the uniformity of the slurry; the signal is sent through the control cabinet 18, and the liquid level meter 12 is used to monitor the slurry level in the stirring tank 5 and the finished slurry tank 6 in real time, and the liquid level meter 12 is used to detect the stock of the slurry in the tank; the liquid level meter 12 is also connected to the control cabinet 18 to realize the automatic alarm and shutdown function. When the liquid level is too high or too low, the stirring or conveying is automatically stopped to prevent equipment damage or production accidents.

[0052] According to an embodiment of the utility model, the slurry processing circuit is further provided with an air compressor 10 , and the air compressor 10 is connected to the pneumatic butterfly valve 9 to provide an air source for the pneumatic butterfly valve 9 .

[0053] In this technical solution, the air compressor is used to provide compressed air to drive the pneumatic butterfly valve 9.

[0054] According to one embodiment of the utility model, the pneumatic butterfly valve 9 is arranged at the bottom of the mixing tank 5 and the finished product slurry tank 6, and the high-concentration sewage accumulated under the mixing tank 5 and the finished product slurry tank 6 for a long time is circulated to the sand settling tank 3, and then re-enters the mixing tank 5 after being processed by the cyclone 4.

[0055] In the present technical solution, when the materials in the mixing tank 5 and the finished product slurry tank 6 are stationary for a long time or are insufficiently stirred, solid particles or heavy substances settle to the bottom of the tank. If the high-concentration sewage accumulated for a long time is not discharged in time, it will affect the quality of the materials in the tank or cause pipeline blockage. The pneumatic butterfly valve 9 is opened to discharge the high-concentration sewage accumulated for a long time into the sand settling tank 3.

[0056] The usage process of the above embodiment is as follows:

[0057] like Figure 1 and Figure 2As shown, the concrete tank truck pours the remaining waste and water into the discharge trough 1, and the built-in cyclone 4 of the discharge trough 1 starts to work, and the fine sand and sewage in the sewage are initially separated by centrifugal force. The fine sand is deposited above the discharge trough 1 due to its large density, and the slurry water flows out through the cyclone 4; the sand and gravel separator 2 receives the waste washed down from the discharge trough 1, and separates the sand and gravel by vibration or mechanical action. The separated sand and gravel are transported to the sand bin 16 and the stone bin 17 for storage respectively, and the sewage containing fine sand flows into the grit chamber 3, and the sand and water are further separated by sedimentation; the sewage in the grit chamber 3 is treated again by the cyclone 4 to ensure that the fine sand is fully recovered;

[0058] The mixing tank 5 receives the slurry water flowing out of the cyclone 4, and the stirring device 7 stirs the slurry water in the mixing tank 5 to ensure its uniformity. The stirred slurry enters the finished slurry tank 6, and the concentration of the slurry is monitored by the concentration tester device 11 to ensure that it meets the use requirements. The slurry in the finished slurry tank 6 is measured by the sewage scale 14 and then sent to the mixing host for reuse; if necessary, a certain amount of clean water is poured into the finished slurry tank 6 through the clean water tank 15 to ensure that the concentration of the slurry meets the requirements. The sewage scale 14 ensures the accurate measurement and control of the slurry to meet the production needs of the concrete mixing station. The control cabinet 18 collects real-time data (such as flow, concentration, liquid level, etc.) from the sand and gravel separation circuit and the slurry treatment circuit. Through the control cabinet 18, the water pump 8, the stirring device 7, the pneumatic butterfly valve 9 and other equipment can be remotely controlled to ensure the efficient operation of the system and zero discharge of sewage. For example, when the high-concentration sewage accumulated for a long time at the bottom of the mixing tank 5 and the finished slurry tank 6 is sent to the grit chamber 3 through the pneumatic butterfly valve 9 for separation again.

[0059] Although the utility model is described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the utility model is not limited thereto. Without departing from the spirit and essence of the utility model, ordinary technicians in the field can make various equivalent modifications or substitutions to the embodiments of the utility model, and these modifications or substitutions should be within the scope of the utility model / any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A zero-discharge treatment system for wastewater in a concrete mixing station, characterized in that: It includes sand and gravel separation circuit, slurry treatment circuit and zero emission treatment circuit, among which: The sand and gravel separation circuit comprises a discharge trough (1), a sand and gravel separator (2) and a grit chamber (3) which are arranged in sequence; the discharge trough (1) is provided with a cyclone (4), one end of the cyclone (4) is connected to the grit chamber (3) through a pump, and after the sewage in the grit chamber (3) is processed by the cyclone (4), fine sand falls into the upper part of the discharge trough (1); the other end of the cyclone (4) is connected to a stirring tank (5) through a pipeline (13); A slurry treatment loop comprises a stirring tank (5) and a finished slurry tank (6) which are arranged in sequence; one end of the stirring tank (5) is connected to a discharge tank (1) via a cyclone (4), and the other end of the stirring tank (5) is connected to a finished slurry tank (6); the finished slurry tank (6) is connected to a sewage scale (14) via a pipeline (13), and a concentration tester device (11) is arranged above the finished slurry tank (6); The zero-emission processing circuit comprises a control cabinet (18), wherein the control cabinet (18) is respectively connected to the sand and gravel separation circuit and the slurry processing circuit.

2. The zero-discharge treatment system for wastewater from a concrete mixing station as claimed in claim 1, characterized in that: The unloading trough (1) is a designated position in front of the concrete tank truck for unloading, and the concrete tank truck pours the remaining waste materials and water into the unloading trough (1).

3. The zero-discharge treatment system for wastewater from a concrete mixing station as claimed in claim 1, characterized in that: The sand and gravel separator (2) is connected to the discharge trough (1) and is used to receive waste material flushed down from the discharge trough (1); the sand and gravel separator (2) is respectively connected to the sand bin (16) and the stone bin (17), and the sand bin (16) and the stone bin (17) are respectively used to store the sand and gravel separated from the sand and gravel separator (2).

4. The zero-discharge treatment system for wastewater from a concrete mixing station as claimed in claim 1, characterized in that: The grit chamber (3) is connected to the sand and gravel separator (2) and is used to receive sewage containing fine sand discharged from the sand and gravel separator (2).

5. The zero-discharge treatment system for wastewater from a concrete mixing station as claimed in claim 1, characterized in that: One end of the sewage scale (14) receives the slurry drawn from the finished slurry tank (6), and the other end allows the weighed and metered slurry to enter the mixing main unit.

6. The zero-discharge treatment system for wastewater from a concrete mixing station as claimed in claim 1, characterized in that: The concentration tester device (11) is installed above the finished product slurry tank (6) and is used to measure the concentration of the slurry.

7. The zero-discharge treatment system for wastewater from a concrete mixing station as claimed in claim 1, characterized in that: The slurry processing circuit is also provided with a stirring device (7), a pneumatic butterfly valve (9) and a liquid level meter (12); the stirring device (7) and the liquid level meter (12) are both arranged in the stirring tank (5) and the finished slurry tank (6), and the stirring device (7), the pneumatic butterfly valve (9) and the liquid level meter (12) are respectively connected to a control cabinet (18) for controlling stirring action, switching of the pneumatic butterfly valve (9), and liquid level detection.

8. The zero-discharge treatment system for wastewater from a concrete mixing station as claimed in claim 1, characterized in that: The slurry processing circuit is also provided with an air compressor (10), which is connected to the pneumatic butterfly valve (9) and is used to provide an air source for the pneumatic butterfly valve (9).

9. The zero-discharge treatment system for wastewater from a concrete mixing station as claimed in claim 7, characterized in that: The pneumatic butterfly valve (9) is arranged at the bottom of the stirring tank (5) and the finished product slurry tank (6), and circulates the high-concentration sewage accumulated under the stirring tank (5) and the finished product slurry tank (6) for a long time to the grit chamber (3), and then re-enters the stirring tank (5) after being processed by the cyclone (4).

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