Tail water clear liquid resource utilization system after landfill leachate treatment

Abstract

The utility model discloses a waste landfill leachate treatment tail water clear liquid resource utilization system which comprises a tail water clear liquid collecting pool, a conveying pump, an energy dissipation unit and a tail water clear liquid receiving pool which are sequentially connected through a conveying pipeline, and the energy dissipation unit comprises a tubular generator set and a buffer pool which are connected to the conveying pipeline in parallel. According to the system, the tail water clear liquid collecting pool, the conveying pump, the energy dissipation unit and the tail water clear liquid receiving pool are sequentially connected through conveying pipelines, so that the self-produced tail water clear liquid of the household garbage landfill is conveyed to the household garbage incineration field for resource utilization. The tubular generator set and the buffer pool which are connected in parallel are arranged at the front end of the tail water clear liquid receiving pool, potential energy of the tail water clear liquid is converted into electric energy for resource utilization, water flow is prevented from impacting the ground, and the problem of high-lift long-distance high-fall tail water clear liquid conveying energy dissipation is effectively solved. And full-amount resource utilization of the landfill leachate self-produced tail water clear liquid can be achieved, water environment protection is facilitated, and the input-output ratio is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage resource utilization, and specifically relates to a system for resource utilization of tail water clear liquid after landfill leachate treatment. Background Art

[0002] The treated clear liquid effluent from the leachate generated by the landfill of domestic waste must meet the "Standards for Pollution Control of Domestic Waste Landfills" (GB 16889-2008). In addition to being used as recycled water in the system, the treated clear liquid must be transported to the municipal sewage treatment plant through a dedicated pipeline for tail water. The system recycled water accounts for about 10% to 30% of the total tail water, and the clear liquid transported to the municipal sewage treatment plant accounts for about 70% to 90% of the total tail water. Usually, in order to ensure that the clear liquid effluent indicators transported to the municipal sewage treatment plant meet the standards, online real-time monitoring equipment needs to be installed, which will increase the operation and maintenance costs of the online monitoring equipment by 100,000 to 150,000 yuan per year. At the same time, in order to prevent the leakage of sewage caused by damage or other failures of the dedicated pipeline for tail water, it is also necessary to spend 50,000 to 150,000 yuan per year on the maintenance costs of the dedicated pipeline for tail water. The clear liquid effluent from the incineration of domestic waste is required to meet the water reuse standard for the open circulating cooling water system in the "Urban Wastewater Recycling-Industrial Water Quality Standard" (GB / T19923-2005) after treatment. The clear liquid after treatment is all used for cooling the incinerator. In general, the amount of clear liquid produced by the incineration plant cannot meet the cooling tower supply needs, so it is necessary to draw enough water from other places as supplementary water for cooling.

[0003] The inventor of the present application has designed to use the tail water clear liquid of the domestic waste landfill leachate treatment project for the cooling tower water replenishment of the waste incineration project. This solves the water replenishment gap of the waste incineration cooling tower, and at the same time saves the high operation and maintenance costs generated by the outward delivery of the treated clear liquid of the domestic waste landfill leachate. Usually, the domestic waste landfill leachate treatment project is mostly located at the lowest point of the domestic waste landfill, while the domestic waste incineration project is located at a higher position. To clean and transport the tail water of the domestic waste landfill leachate treatment project to the domestic waste incineration project for secondary resource utilization, the tail water clear liquid of the domestic waste landfill leachate treatment project must first be transported to the highest point of the domestic waste landfill, and then the high and low level liquid level difference is used to flow to the domestic waste incineration project. Therefore, the potential energy formed by high-lift, long-distance, high-drop transportation needs to be overcome during the transportation of the tail water clear liquid. The energy dissipation under conventional high-lift, long-distance, high-drop transportation conditions generally adopts stepped energy dissipation, which has the problems of large unnecessary waste of energy and high overall transportation cost. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in view of the above-mentioned problems of the prior art, a system for resource utilization of tail water clear liquid after landfill leachate treatment is provided, which has strong practicality, high input-output ratio and high sewage resource utilization rate.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A system for resource utilization of tail water clear liquid after landfill leachate treatment comprises a tail water clear liquid collection pool, a delivery pump, an energy dissipation unit and a tail water clear liquid receiving pool which are sequentially connected by a delivery pipeline. The energy dissipation unit comprises a tubular generator set and a buffer tank which are connected in parallel to the delivery pipeline.

[0007] As a further improvement of the utility model, the tail water clear liquid collection pool and the tail water clear liquid receiving pool are respectively located on both sides of the landfill body, and the conveying pipeline that crosses the landfill body and is connected to the energy dissipation unit includes an uphill pipe section, a flat slope pipe section and a downhill pipe section, and a negative pressure relief valve is arranged on the downhill pipe section.

[0008] As a further improvement of the present invention, the negative pressure relief valve controls the pressure inside the pipe to be greater than or equal to -0.06MPa.

[0009] As a further improvement of the utility model, the buffer tank includes a tank body and a first baffle and a second baffle located in the tank body, a water inlet and a water outlet are respectively provided on both sides of the tank body, the water inlet is arranged close to the top wall of the tank body, and the water outlet is arranged close to the bottom wall of the tank body, the first baffle is obliquely arranged opposite to the water inlet for refracting the incoming water flow downward, and the second baffle is located between the first baffle and the bottom wall of the tank body for blocking the water flow refracted by the first baffle from directly impacting the bottom wall of the tank body.

[0010] As a further improvement of the present invention, the first baffle is fixed between the top wall and the side wall of the pool body, and the first baffle forms an angle of 45° with the top wall and the side wall of the pool body respectively. The second baffle is vertically fixed to the side wall of the pool body, and the size of the second baffle along the direction of inlet water flow is 1 / 2 of the size of the pool body in this direction.

[0011] As a further improvement of the utility model, a return branch is provided on the delivery pipeline near the output end of the delivery pump, and the return branch is used to connect to the wastewater tank. A first stop valve is provided on the return branch, and a second stop valve and a water quality detector are provided on the delivery pipeline near the return branch.

[0012] As a further improvement of the utility model, it further comprises a controller, and the water quality detector, the first stop valve and the second stop valve are respectively connected to the controller.

[0013] As a further improvement of the utility model, the tubular generator set includes a tubular generator and a battery, the tubular generator is connected to the battery, and the battery is connected to the controller.

[0014] As a further improvement of the present invention, the water quality detector is at least one of a conductivity detector, a chloride ion detector, a sodium ion detector, a COD detector and an ammonia nitrogen detector.

[0015] As a further improvement of the utility model, stop valves are provided on the conveying pipelines at the front end of the tubular generator set and the buffer tank.

[0016] As a further improvement of the utility model, the delivery pipeline is a HDPE pipe and / or a stainless steel pipe.

[0017] Compared with the prior art, the advantages of the utility model are:

[0018] (1) The utility model is a system for resource utilization of tail water clear liquid after landfill leachate treatment. Through the tail water clear liquid collection pool, delivery pump, energy dissipation unit and tail water clear liquid receiving pool connected by delivery pipelines in sequence, the tail water clear liquid produced by the domestic waste landfill is fully transported to the domestic waste incineration plant for resource utilization. By arranging a tubular generator set and a buffer pool connected in parallel at the front end of the tail water clear liquid receiving pool, the potential energy of the tail water clear liquid can be converted into electrical energy for resource utilization, and the physical structural parts in the buffer pool can be used to consume the potential energy formed by the tail water clear liquid to avoid water flow impacting the ground, effectively solving the problem of high-lift, long-distance and high-drop tail water clear liquid transportation and energy dissipation, and realizing the resource utilization of the tail water clear liquid produced by the landfill leachate, which is beneficial to the protection of the water environment. The construction cost of the utility model is only the cost of pipes and the cost of construction and installation, which is a one-time investment. The benefits generated save the operation and maintenance costs of online monitoring equipment and the maintenance costs of tail water clear liquid special pipelines for system operation, which is a long-term continuous cost. Therefore, the utility model has the advantage of high input-output ratio after being put into production.

[0019] (2) The utility model installs a negative pressure relief valve on the downhill section of the conveying pipeline. When the pressure is lower than the set pressure value, the negative pressure relief valve will automatically open to allow the air outside the pipe to enter the pipe, and timely adjust the suction pressure difference between the downhill section and the flat slope section, effectively solving the problem of siphoning and squeezing the pipeline due to the high head difference, extending the durability of the conveying pipeline, and making the system operation more reliable and stable.

[0020] (3) The utility model sets a detector and a return branch pipe on the delivery pipeline at the rear end of the delivery pump, which can monitor the water quality in real time and transport unqualified tail water to the wastewater pool for further treatment through the return branch pipe, so as to ensure that the tail water delivered to the incineration project meets the water quality requirements.

[0021] (4) The utility model connects the tubular generator set with the controller, and supplies the electric energy generated by the tubular generator set to the controller, the water quality detector and various control valves, thereby realizing the energy self-supply of the system control components and improving the comprehensive utilization rate of the tail water clear liquid resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structural principle of the tail water clear liquid resource utilization system of a specific implementation method;

[0023] Figure 2 It is a schematic diagram of the structural principle of the buffer pool in a specific implementation method.

[0024] Legend: 1. Tail water clear liquid collection tank; 2. Delivery pump; 3. Energy dissipation unit; 31. Tubular generator set; 32. Buffer tank; 321. First baffle; 322. Second baffle; 323. Water inlet; 324. Water outlet; 4. Tail water clear liquid receiving tank; 5. Landfill; 61. Uphill pipe section; 62. Flat slope pipe section; 63. Downhill pipe section; 64. Return branch pipe; 65. First stop valve; 66. Second stop valve; 7. Negative pressure relief valve; 8. Water quality detector; 9. Controller; 10. Wastewater tank. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0026] Figure 1 A specific implementation of the system for resource utilization of tail water clear liquid after landfill leachate treatment of the utility model is shown, comprising a tail water clear liquid collection tank 1, a delivery pump 2, an energy dissipation unit 3 and a tail water clear liquid receiving tank 4 connected in sequence by a delivery pipeline, and the energy dissipation unit 3 comprises a tubular generator set 31 and a buffer tank 32 connected in parallel to the delivery pipeline. In this embodiment, the tail water clear liquid produced by the domestic waste landfill is fully transported to the domestic waste incineration plant for resource utilization through the tail water clear liquid collection tank 1, the delivery pump 2, the energy dissipation unit 3 and the tail water clear liquid receiving tank 4 connected in sequence by a delivery pipeline. By arranging a tubular generator set 31 and a buffer tank 32 connected in parallel at the front end of the tailwater clear liquid receiving tank 4, the potential energy of the tailwater clear liquid can be converted into electrical energy for resource utilization, and the physical structural parts in the buffer tank 32 can be used to consume the potential energy formed by the tailwater clear liquid to avoid the water flow from impacting the ground, effectively solving the problem of high-lift, long-distance and high-drop tailwater clear liquid transportation and energy dissipation, and realizing the full resource utilization of the self-produced tailwater clear liquid of the landfill leachate, which is beneficial to the protection of the water environment. The construction cost of this embodiment is only the cost of pipes and the cost of construction and installation, which is a one-time investment. The benefits generated save the operation and maintenance costs of online monitoring equipment and the maintenance costs of special pipelines for tailwater clear liquid for system operation, which is a long-term cost. Therefore, the utility model has the advantage of high input-output ratio after being put into production.

[0027] The working process of the system for resource utilization of tail water clear liquid after landfill leachate treatment in this embodiment is as follows:

[0028] The tail water clear liquid of the domestic waste landfill leachate after biochemical treatment and membrane treatment is collected in the tail water clear liquid collection tank 1, and is transported to the energy dissipation unit 3 through the delivery pump 2 and the delivery pipeline across the landfill body 5. Part of the tail water clear liquid enters the buffer tank 32, and the physical structural parts in the buffer tank 32 consume the potential energy formed by the tail water clear liquid. After the potential is eliminated, it enters the tail water clear liquid collection tank 1, and part of the tail water clear liquid enters the tubular generator set 31. The tubular generator set 31 converts the potential energy formed by the liquid level difference into electrical energy, and after the potential is eliminated, it enters the tail water clear liquid collection tank 1. The electrical energy generated by the tubular generator set 31 can be used to power internal control components or external electrical equipment. The water in the tail water clear liquid collection tank 1 is used as circulating cooling water for the cooling tower of the waste incineration project to achieve secondary utilization of the tail water clear liquid.

[0029] Further improved, in this embodiment, the tailwater clear liquid collection pool 1 and the tailwater clear liquid receiving pool 4 are respectively located on both sides of the landfill body 5, and the delivery pipeline that crosses the landfill body 5 and is connected to the energy dissipation unit 3 includes an uphill pipe section 61, a flat slope pipe section 62 and a downhill pipe section 63, and a negative pressure relief valve 7 is provided on the downhill pipe section 63. Since the water in the uphill pipe section 61 and the flat slope section is full, the pressure inside and outside the pipe is equal and no pressure relief is required, and the downhill pipe section 63 causes the water flow speed to accelerate due to the gravity of the water, resulting in a suction pressure difference between the downhill pipe section 63 and the flat slope pipe section, so the installation position of the negative pressure relief valve 7 is required to be the downhill pipe section 63 of the delivery pipeline, the front end of the tubular generator set 31, and the position of the tubular generator set is the lower limit position, and the best position is still the position where the flat slope pipe section and the downhill pipe section 63 turn. In this embodiment, after the negative pressure relief valve 7 is installed on the downhill pipe section 63, when the pressure is lower than the set pressure value, the negative pressure relief valve 7 will automatically open to allow the air outside the pipe to enter the pipe, and timely adjust the suction pressure difference between the downhill pipe section 63 and the flat slope pipe section, which can effectively prevent the downhill pipe section 63 from being squeezed and exploded due to the suction pressure difference, extend the durability of the conveying pipeline, and improve the stability of the system.

[0030] As a further improvement, in this embodiment, the negative pressure relief valve 7 controls the pressure in the pipe to be greater than or equal to -0.06MPa, which can better protect the conveying pipeline.

[0031] like Figure 2As shown, in a further improvement, in this embodiment, the buffer tank 32 includes a tank body and a first baffle 321 and a second baffle 322 located in the tank body, and a water inlet 323 and a water outlet 324 are respectively provided on both sides of the tank body, the water inlet 323 is arranged close to the top wall of the tank body, and the water outlet 324 is arranged close to the bottom wall of the tank body, the first baffle 321 is arranged obliquely opposite to the water inlet 323 to refract the incoming water flow downward, and the second baffle 322 is located between the first baffle 321 and the bottom wall of the tank body to prevent the water flow refracted by the first baffle 321 from directly impacting the bottom wall of the tank body. Compared with the stepped energy dissipation structure of the prior art, the buffer tank 32 of this embodiment has good energy dissipation effect, good shock and explosion resistance, high safety, flexible construction, and is more conducive to environmental protection.

[0032] As a further improvement, in this embodiment, the first baffle 321 is fixed between the top wall and the side wall of the pool body, and the first baffle 321 forms an angle of 45° with the top wall and the side wall of the pool body respectively. The second baffle 322 is vertically fixed to the side wall of the pool body, and the size of the second baffle 322 along the direction of the incoming water flow is 1 / 2 of the size of the pool body in this direction.

[0033] The conveying pipeline is a HDPE pipe or a stainless steel pipe. The buffer tank 32 adopts a reinforced concrete structure, and the first baffle 321 and the second baffle 322 are all made of full steel concrete structural parts, and the thickness of the plate is 3mm to 5mm.

[0034] Further improved, in this embodiment, a return branch pipe 64 is provided on the delivery pipeline near the output end of the delivery pump 2, and the return branch pipe 64 is used to connect to the wastewater pool 10. A first stop valve 65 is provided on the return branch pipe 64, and a second stop valve 66 and a water quality detector 8 are provided on the delivery pipeline near the return branch pipe 64. The water quality detector 8 detects the water quality of the tail water clear liquid in real time. When the water quality test is qualified, the second stop valve 66 is opened, the first stop valve 65 is closed, and the delivery pipeline transports the tail water clear liquid to the energy dissipation unit 3. When the water quality test is unqualified, the second stop valve 66 is closed, the first stop valve 65 is opened, and the tail water clear liquid is transported from the return branch pipe 64 to the wastewater pool 10 for further treatment, thereby ensuring that the tail water clear liquid transported to the incineration project meets the open circulating cooling water system supplementary water reuse standard.

[0035] As a further improvement, in this embodiment, a controller 9 is also included, and the water quality detector 8, the first stop valve 65 and the second stop valve 66 are respectively connected to the controller 9 to realize automatic operation of the system for resource utilization of tail water clear liquid after landfill leachate treatment.

[0036] As a further improvement, in this embodiment, the tubular generator set 31 is connected to the controller 9 to supply power to the controller 9 .

[0037] As a further improvement, in this embodiment, the tubular generator set 31 includes a tubular generator and a battery, the tubular generator is connected to the battery, and the battery is connected to the controller 9. The tubular generator is specifically an impeller generator, and when the tail water clear liquid flows from top to bottom to a point close to the water use point or the height difference reaches the requirement of the tubular generator, the tubular generator set converts potential energy into electrical energy and stores it in the battery, and the battery then supplies power to the controller 9.

[0038] Further improved, in this embodiment, the water quality detector 8 is a conductivity detector. Of course, in other embodiments, a chloride ion detector, a sodium ion detector, a COD detector or an ammonia nitrogen detector can also be used.

[0039] The automatic control process of the system for resource utilization of tail water clear liquid after landfill leachate treatment in this embodiment is as follows:

[0040] like Figure 1 As shown in the dashed line: input signal a is the signal value X detected by the water quality detector 8, output signal b is the control signal 0 or 1 output by the controller 9 after operation, and input power supply c provides power for the controller 9, water quality detector 8, first stop valve 65 and second stop valve 66 and other control components, which is provided by the battery of the tubular generator set 31. Of course, in other embodiments, an external power supply can also be used. The controller 9 can manually set the control signal value Y, which is the conductivity value to be controlled by the tail water clear liquid in this embodiment. When the signal value X received by the controller 9 is less than or equal to the control signal value Y, the controller 9 outputs a control signal 1 to control the second stop valve 66 to open and the first stop valve 65 to close; when the signal value X received by the controller 9 is greater than the control signal value Y, the controller 9 outputs a control signal 0 to control the first stop valve 65 to open and the second stop valve 66 to close. This process only involves a simple comparison of numerical values, and a conventional controller such as a PLC controller can be used.

[0041] Although the utility model is disclosed as above with preferred embodiments, it is not intended to limit the utility model. Any technician familiar with the art can use the above disclosed methods and technical contents to make many possible changes and modifications to the technical solution of the utility model without departing from the spirit and technical solution of the utility model, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of protection of the technical solution of the utility model.

Claims

1. A system for resource utilization of tail water after landfill leachate treatment, characterized in that: The invention comprises a tail water clear liquid collection pool (1), a delivery pump (2), an energy dissipation unit (3) and a tail water clear liquid receiving pool (4) which are sequentially connected by a delivery pipeline, wherein the energy dissipation unit (3) comprises a tubular generator set (31) and a buffer pool (32) which are connected in parallel to the delivery pipeline.

2. The system for resource utilization of tail water after landfill leachate treatment according to claim 1, characterized in that: The tail water clear liquid collection pool (1) and the tail water clear liquid receiving pool (4) are respectively located on both sides of the landfill body (5); the conveying pipeline that crosses the landfill body (5) and is connected to the energy dissipation unit (3) comprises an uphill pipe section (61), a flat slope pipe section (62) and a downhill pipe section (63); and a negative pressure relief valve (7) is provided on the downhill pipe section (63).

3. The system for resource utilization of tail water after landfill leachate treatment according to claim 2 is characterized in that: The negative pressure relief valve (7) controls the pressure in the pipe to be greater than or equal to -0.06 MPa.

4. The system for resource utilization of tail water after landfill leachate treatment according to claim 2, characterized in that: The buffer tank (32) comprises a tank body and a first baffle (321) and a second baffle (322) located in the tank body. A water inlet (323) and a water outlet (324) are respectively provided on both sides of the tank body. The water inlet (323) is arranged close to the top wall of the tank body, and the water outlet (324) is arranged close to the bottom wall of the tank body. The first baffle (321) is arranged obliquely opposite to the water inlet (323) to refract the incoming water flow downward. The second baffle (322) is located between the first baffle (321) and the bottom wall of the tank body to prevent the water flow refracted by the first baffle (321) from directly impacting the bottom wall of the tank body.

5. The system for resource utilization of tail water after landfill leachate treatment according to claim 4 is characterized in that: The first baffle (321) is fixed between the top wall and the side wall of the pool body, and the first baffle (321) forms an angle of 45° with the top wall and the side wall of the pool body respectively. The second baffle (322) is vertically fixed to the side wall of the pool body, and the size of the second baffle (322) along the direction of water inlet flow is 1 / 2 of the size of the pool body in this direction.

6. The system for resource utilization of tail water after landfill leachate treatment according to claim 1, characterized in that: A water return branch pipe (64) is provided on the delivery pipeline near the output end of the delivery pump (2), and the water return branch pipe (64) is used to connect to the wastewater tank (10). A first stop valve (65) is provided on the water return branch pipe (64), and a second stop valve (66) and a water quality detector (8) are provided on the delivery pipeline near the water return branch pipe (64).

7. The system for resource utilization of tail water after landfill leachate treatment according to claim 6, characterized in that: It also includes a controller (9), and the water quality detector (8), the first stop valve (65) and the second stop valve (66) are respectively connected to the controller (9).

8. The system for resource utilization of tail water after landfill leachate treatment according to claim 7, characterized in that: The tubular generator set (31) comprises a tubular generator and a battery, wherein the tubular generator is connected to the battery, and the battery is connected to a controller (9).

9. The system for resource utilization of tail water after landfill leachate treatment according to any one of claims 6 to 8, characterized in that: The water quality detector (8) is at least one of a conductivity detector, a chloride ion detector, a sodium ion detector, a COD detector and an ammonia nitrogen detector.

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