Cavern drainage treatment system

Abstract

The utility model discloses a cavern drainage treatment system which comprises a coagulation reaction tank, a liquid outlet of the coagulation reaction tank is communicated with a sedimentation tank, a sludge discharge port of the sedimentation tank is communicated with a feed port of a magnetic recovery device, and a sludge discharge port of the magnetic recovery device is communicated with a feed port of a sludge dewatering device. According to the treatment method, the sludge volume is reduced after the sludge is dewatered, the dewatered sludge can be directly discharged, and the gravel can be used for recycling and reprocessing and can be directly recycled to obtain mineral powder, so that the rapid and deep treatment of the drainage of the cavern is realized.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment, in particular to a system for treating cavern drainage. Background Art

[0002] The cavern water inrush generated by crossing the aquifer during cavern construction, the sewage generated during construction, and the sewage generated during grouting. The cavern drainage volume varies greatly, within a few meters 3 / h to several hundred m 3 / h. The cavern water is mainly groundwater, which is relatively clean. The pollutants are mainly solid suspended matter such as mud, sand, and dust mixed in during the discharge of the water. In addition, a small amount of construction wastewater is also generated during construction and grouting. Construction cavern projects are mostly located in mountainous and hilly areas. Many caverns are close to water sources. A large amount of sewage is generated during the construction process, which seriously affects the ecological environment around the caverns and needs to be treated urgently.

[0003] Chinese Patent 201910875105.4 discloses a method for treating sewage from tunnel construction, which mainly uses secondary coagulation and sedimentation to remove high-turbidity construction sewage, and requires the addition of a large amount of coagulation and coagulant agents. Chinese Patent 201620632465.3 discloses a device for deep treatment of sewage from tunnel construction, which includes a centrifugal vortex separator, a composite baffle reactor, a lower inclined tube sedimentation separation chamber, an upper flotation separation chamber, and a self-flushing filter cavern, which are sequentially connected by a wastewater delivery high-pressure hose. It requires four high-pressure delivery pumps, has high processing energy consumption, and the cavern water inrush and drainage volume varies greatly, making it difficult to meet the processing requirements of the cavern drainage peak.

[0004] The Chinese patent with publication number CN112358115A discloses a high-efficiency sludge return and enhanced magnetic coagulation system and a sedimentation method thereof. The sedimentation system includes a magnetic coagulation reaction system, a deep maturation tank, and a sedimentation tank. The magnetic coagulation reaction system, the deep maturation tank, and the sedimentation tank are connected in sequence. The sedimentation method includes magnetic coagulation reaction, deep maturation, sedimentation, and sludge diversion. The sludge in the magnetic recovery system is finally discharged in the form of residual sludge. The sludge return in the sedimentation method is divided into two stages. The first stage of sludge return refers to the sludge in the sedimentation tank returning to the deep maturation tank through the sludge scraping system. The second stage of sludge return refers to the sludge in the deep maturation tank returning to the coagulation reaction system through the sludge diverter. The invention does not treat the residual sludge. The cavern has a large drainage volume and a large amount of residual sludge. In the prior art, the sludge is treated in a sludge tank and dehydrated. The dehydration time is long and the treatment is very troublesome.

[0005] The Chinese patent application with publication number CN111825184B discloses a tunnel drainage treatment tank system, in which a secondary overflow weir is provided between the flocculation reaction tank and the sedimentation tank, and a primary overflow weir is provided between the pre-sedimentation tank and the flocculation reaction tank.

[0006] In recent years, with the continuous development of new energy, energy storage cavern projects such as pumped storage and compressed air storage have also developed rapidly. The drainage treatment problem in the cavern process has also become an important key issue that cannot be ignored. Therefore, it is urgent to design an efficient cavern drainage system treatment system. Summary of the invention

[0007] The technical problem to be solved by the utility model is to provide a cavern drainage treatment system in view of the deficiencies in the prior art, so as to achieve efficient and low-cost treatment of cavern sewage and dewater the remaining sludge to achieve direct discharge or recycling of the sludge.

[0008] In order to solve the above technical problems, the technical solution adopted by the utility model is: a system for cavern drainage treatment, including a coagulation reaction tank, the liquid outlet of the coagulation reaction tank is connected to the sedimentation tank, the mud discharge port of the sedimentation tank is connected to the feed port of a magnetic recovery device, and the mud discharge port of the magnetic recovery device is connected to the feed port of a sludge dewatering device.

[0009] The sludge dewatering device is used for sludge dewatering. Through the treatment method of the present application, the sludge volume is reduced after sludge dewatering, the dewatered sludge can be directly discharged, and the sand and gravel therein can be used for recycling and reprocessing, and can be directly recycled to obtain mineral powder.

[0010] In a preferred embodiment of the utility model, the cavern drainage treatment system also includes a primary sedimentation tank, and the cavern drainage enters through the liquid inlet of the primary sedimentation tank, and the discharge port of the primary sedimentation tank is connected to the liquid inlet of the coagulation reaction tank.

[0011] The primary sedimentation tank is mainly used to remove large particles of sand and gravel and some suspended matter such as soil in the cavern drainage, and to regulate the amount of water discharged from the cavern. There are mud buckets and mud discharge facilities at the bottom of the primary sedimentation tank.

[0012] In a preferred embodiment of the present invention, the primary sedimentation tank comprises a first primary sedimentation tank and a second primary sedimentation tank arranged in parallel, and the lower end of the first primary sedimentation tank is connected to the high end of the second primary sedimentation tank through a water pipe.

[0013] The amount of water discharged from the cavern varies greatly. The present invention arranges a first primary sedimentation tank and a second primary sedimentation tank to enhance the sedimentation effect and ensure the sedimentation time.

[0014] The water pipe is set at an angle, and the end of the water pipe close to the first primary sedimentation tank is lower, so the mud flows downward, enhancing the sedimentation effect.

[0015] In a preferred embodiment of the present invention, the coagulation reaction tank comprises a first coagulation reaction tank and a second coagulation reaction tank arranged in parallel, and the first coagulation reaction tank and the second coagulation reaction tank are connected via an upper overflow structure.

[0016] A coagulant is added to the first coagulation reaction tank, and magnetic powder is added to the second coagulation reaction tank, and magnetic coagulation and enhanced separation reaction is performed in different zones. The coagulant can be PAC, PAM, PFS, etc.

[0017] In a preferred embodiment of the present invention, the second primary sedimentation tank and the first coagulation reaction tank are connected via an upper overflow structure.

[0018] In a preferred embodiment of the present invention, the second coagulation reaction tank is connected to the sedimentation tank via an upper overflow structure.

[0019] In a preferred embodiment of the utility model, the magnetic recovery device includes a shearing device, the discharge port of the shearing device is connected to the feed port of the magnetic drum. The magnetic recovery device can recover magnetic powder in the sludge, and the recovery rate reaches 99%.

[0020] In a preferred embodiment of the utility model, the cavern drainage treatment system further comprises a dosing device, the dosing device comprises a stirring device connected to the discharge port of the magnetic drum, and the discharge port of the stirring device is provided with a dosing pump.

[0021] In a preferred embodiment of the utility model, a turbidity meter is provided at the liquid inlet of the primary sedimentation tank, and a metering device is installed at the bottom of the stirring device.

[0022] The present invention arranges a turbidity meter at the liquid inlet of the primary sedimentation tank to determine the content of sand and soil in the cavern drainage. The dosage of magnetic powder and coagulant can be automatically adjusted based on the neural network algorithm. The suspended pollutants such as sand and soil in the cavern drainage are further removed by magnetic coagulation enhanced separation in the coagulation reaction tank, thereby effectively and low-costly solving the problem of environmental pollution caused by cavern drainage.

[0023] The present invention can manually observe and control the turbidity meter, the metering device and the dosing pump, or control the turbidity meter, the metering device and the dosing pump through a control system.

[0024] In a preferred embodiment of the present utility model, the turbidity meter, the metering device and the dosing pump are all electrically connected to a control system.

[0025] Specifically, a water hole is provided at the bottom of the sedimentation tank, and a sludge pump is provided in the sedimentation tank to discharge the mud and sand in the sedimentation tank regularly. The sludge dewatering machine can be a screw stacking machine or a belt filter press, and the sludge water content is ≤60%.

[0026] The effluent from the primary sedimentation tank enters the coagulation reaction tank, and coagulant precipitant and magnetic powder are added to the coagulation reaction tank. Large alum flowers are formed through stirring. Under the enhanced precipitation effect of the magnetic powder, precipitation is quickly formed in the sedimentation tank. Magnetic powder strengthening can greatly accelerate the precipitation reaction speed.

[0027] The effluent from the sedimentation tank meets the comprehensive sewage discharge standard and is then discharged directly or indirectly into the surrounding water environment. The sludge from the sedimentation tank enters the magnetic separation recovery device, where the magnetic powder in the sludge is recycled as a coagulant for coagulation and enhanced sedimentation.

[0028] Compared with the prior art, the utility model has the following beneficial effects:

[0029] (1) The present invention dewaters the excess sludge to achieve direct discharge or recycling of the sludge, thereby achieving recycling of the sludge.

[0030] (2) The present invention adopts primary sedimentation and magnetic coagulation sedimentation to achieve rapid and deep treatment of cavern drainage, effectively protect the ecological environment around the cavern, lay the foundation for green construction of the cavern, and solve the problems of large changes in cavern drainage water volume and large impact. At the same time, the magnetic powder can be recycled, effectively reducing the amount of reagents used.

[0031] (3) The present invention adopts a neural network algorithm, which can automatically add coagulants and magnetic powder according to the sand and soil components of the incoming water, thereby reducing the amount of agents used and effectively reducing the treatment cost of cavern drainage. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a front view of an embodiment of the utility model. DETAILED DESCRIPTION

[0033] like Figure 1 As shown, one embodiment of the utility model includes a coagulation reaction tank 6, the liquid outlet of the coagulation reaction tank 6 is connected to the sedimentation tank 9, the mud discharge port of the sedimentation tank 9 is connected to the feed port of the magnetic recovery device 10, and it is characterized in that the mud discharge port of the magnetic recovery device 10 is connected to the feed port of the sludge dewatering device.

[0034] The cavern drainage treatment system further comprises a primary sedimentation tank 1, cavern drainage enters through the liquid inlet 2 of the primary sedimentation tank 1, and the discharge port of the primary sedimentation tank 1 is connected with the liquid inlet of the coagulation reaction tank 6. The primary sedimentation tank 1 comprises a first primary sedimentation tank 3 and a second primary sedimentation tank 4 arranged in parallel, and the lower end of the first primary sedimentation tank 3 is connected with the higher end of the second primary sedimentation tank 4 through a water pipe 5.

[0035] The coagulation reaction tank 6 includes a first coagulation reaction tank 7 and a second coagulation reaction tank 8 arranged in parallel, and the first coagulation reaction tank 7 and the second coagulation reaction tank 8 are connected by an upper overflow structure. The second primary sedimentation tank 4 and the first coagulation reaction tank 7 are connected by an upper overflow structure. The second coagulation reaction tank 8 and the sedimentation tank 9 are connected by an upper overflow structure.

[0036] The magnetic recovery device 10 includes a shearing device 11, and the discharge port of the shearing device 11 is connected to the feed port of the magnetic drum 12. The system for treating cavern drainage is characterized in that it also includes a dosing device, and the dosing device includes a stirring device 14 connected to the discharge port of the magnetic drum 12, and the stirring device 14 is provided with a dosing pump 15. A turbidity meter is provided at the liquid inlet 2 of the primary sedimentation tank 1, and a metering device is installed at the bottom of the stirring device 14. The turbidity meter, the metering device, and the dosing pump 15 are all electrically connected to the control system.

[0037] The effluent from the primary sedimentation tank enters the coagulation reaction tank 6. The coagulation reaction tank 6 is divided into two compartments, namely the first coagulation reaction tank 7 and the second coagulation reaction tank 8, where coagulants and magnetic powder are added respectively. The effluent from the coagulation reaction tank 6 enters the sedimentation tank 9, where it undergoes magnetic enhanced sedimentation to achieve mud-water separation, and the clean water meets the comprehensive discharge standard and is discharged directly or indirectly. The sludge enters the magnetic recovery device 10. In the shearing device 11, the magnetic powder and sludge are fully crushed, and then the magnetic powder in the sludge is recovered in the magnetic drum 12. The recovered magnetic powder and the supplemented new magnetic powder 13 are mixed evenly in the stirring device 14, and then controlled by the intelligent dosing system according to the water quality of the influent, and then dosing is performed through the dosing pump 15. The sludge dewatering device uses a filter press 16. The remaining sludge is filtered by the filter press 16 to obtain a mud cake with a moisture content of less than 60%, which is then dehydrated and transported out.

Claims

1. A system for treating cavern drainage, comprising a coagulation reaction tank (6), wherein the liquid outlet of the coagulation reaction tank (6) is connected to a sedimentation tank (9), and the mud outlet of the sedimentation tank (9) is connected to the feed inlet of a magnetic recovery device (10), characterized in that: The sludge discharge port of the magnetic recovery device (10) is connected to the feed port of the sludge dewatering device; The cavern drainage treatment system further comprises a primary sedimentation tank (1), the cavern drainage enters the primary sedimentation tank (1) through a liquid inlet (2), and the liquid discharge port of the primary sedimentation tank (1) is connected to a liquid inlet of the coagulation reaction tank (6); The primary sedimentation tank (1) comprises a first primary sedimentation tank (3) and a second primary sedimentation tank (4) arranged in parallel, wherein the lower end of the first primary sedimentation tank (3) is connected to the upper end of the second primary sedimentation tank (4) through a water pipe (5); The bottom of the primary sedimentation tank (1) is provided with a mud hopper and mud discharge facilities; A mud discharge pump is arranged in the sedimentation tank (9).

2. The cavern drainage treatment system according to claim 1, characterized in that: The coagulation reaction tank (6) comprises a first coagulation reaction tank (7) and a second coagulation reaction tank (8) which are arranged in parallel, and the first coagulation reaction tank (7) and the second coagulation reaction tank (8) are connected via an overflow structure at the top.

3. The system for cavern drainage treatment according to claim 2, characterized in that: The second primary sedimentation tank (4) and the first coagulation reaction tank (7) are connected via an upper overflow structure.

4. The system for cavern drainage treatment according to claim 2, characterized in that: The second coagulation reaction tank (8) is connected to the sedimentation tank (9) via an overflow structure at the top.

5. The cavern drainage treatment system according to any one of claims 1 to 4, characterized in that: The magnetic recovery device (10) comprises a shearing device (11), wherein the discharge port of the shearing device (11) is connected to the feed port of the magnetic drum (12).

6. The system for cavern drainage treatment according to claim 5, characterized in that: It also includes a dosing device, which includes a stirring device (14) connected to the discharge port of the magnetic drum (12), and the discharge port of the stirring device (14) is provided with a dosing pump (15).

7. The system for treating cavern drainage according to claim 6, characterized in that: A turbidity meter is provided at the liquid inlet (2) of the primary sedimentation tank (1), and a metering device is provided at the bottom of the stirring device (14).

8. The system for treating cavern drainage according to claim 7, characterized in that: The turbidity meter, the metering device and the dosing pump (15) are all electrically connected to a control system.

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