Landfill leachate treatment device

Abstract

The utility model discloses a landfill leachate treatment device which comprises a settling pond (1), a stirrer (2) is arranged in the settling pond (1), a cloth dragging mechanism is arranged on the settling pond (1) and comprises a driving roller (3) located on one side of the top of the settling pond (1) and a driven roller (4) located on the other side of the top of the settling pond (1), a driving mechanism is connected to the driving roller (3), a tension mechanism is arranged on the driven roller (4), and the tension mechanism is connected to the driving roller (3). A covering cloth (5) is wound on the driving roller (3), the covering cloth (5) is connected with the driven roller (4) through a plurality of traction ropes (6) which are arranged side by side, a first guide roller (7) is arranged below the driving roller (3), a second guide roller (8) is arranged below the driven roller (4), and the traction ropes (6) wind around the bottom of the first guide roller (7) and the bottom of the second guide roller (8). The leachate treatment device has the advantage that the leachate treatment speed can be increased.

Description

Technical Field

[0001] This utility model belongs to the field of landfill leachate treatment equipment. Background Technology

[0002] Waste incineration power plants store large amounts of waste transported from various places. During the storage process, this waste generates a lot of leachate, which contains many bacteria and heavy metals and needs to be treated before it can be discharged.

[0003] Leachate treatment involves many steps, one of which is solid-liquid separation. Large pieces of debris in the leachate are first removed by physical methods such as filter screens. Then, the leachate is introduced into a sedimentation tank, where flocculants are added. The water is stirred by a mixer in the sedimentation tank to ensure that the flocculants are evenly mixed. After standing for several hours, sludge forms at the bottom of the sedimentation tank, and the pretreated leachate is placed on top of the sludge.

[0004] The existing sedimentation tanks treat leachate in batches. That is, after each batch of leachate is pumped into the tank and sedimentation is completed, the pretreated leachate is pumped out to the next process, and then the next batch of leachate is pumped in to continue the next sedimentation cycle. This continues until the sludge accumulates to a certain thickness in the tank and has a significant impact on the volume of the sedimentation tank, at which point the sludge is emptied.

[0005] During operation, it was found that during most sedimentation cycles, sludge remained in the tank. When the next tank of leachate was pumped in, the leachate flowing from the top of the sedimentation tank created a water flow that impacted the sludge at the bottom, causing it to re-enter the water. Additionally, the water flow generated when adding flocculants and agitating the water also introduced sludge back into the water. The high sludge content in the water increased the sedimentation time, resulting in a slower leachate treatment rate. Utility Model Content

[0006] The purpose of this invention is to provide a landfill leachate treatment device. This invention has the advantage of improving the leachate treatment speed.

[0007] The technical solution of this utility model: a landfill leachate treatment device, including a sedimentation tank, a stirrer inside the sedimentation tank, and a mopping mechanism on the sedimentation tank. The mopping mechanism includes an active roller located on one side of the top of the sedimentation tank and a passive roller located on the other side of the top of the sedimentation tank. A drive mechanism is connected to the active roller, and a tension mechanism is provided on the passive roller. A covering cloth is wound on the active roller, and the covering cloth is connected to the passive roller through multiple parallel traction ropes. A first guide roller is provided below the active roller, and a second guide roller is provided below the passive roller. Both the first and second guide rollers are located inside the sedimentation tank and at the lower part of the sedimentation tank. The traction ropes pass around the bottom of the first and second guide rollers.

[0008] In the aforementioned landfill leachate treatment device, both ends of the active roller are provided with a first bracket fixed to the sedimentation tank. The active roller is connected to the first bracket by a bearing. The driving mechanism includes a first sprocket connected to one end of the active roller. The first sprocket is connected to a second sprocket via a chain. The sedimentation tank is provided with a first motor whose output end is connected to the second sprocket.

[0009] In the aforementioned landfill leachate treatment device, the passive roller tubular structure and the tension mechanism include a rotating shaft located inside the passive roller. Both ends of the passive roller are connected to the rotating shaft bearings, and both ends of the rotating shaft extend out of the passive roller. Both ends of the rotating shaft are provided with a second bracket fixed to the sedimentation tank. A spiral spring is provided between the rotating shaft and the passive roller, with one end of the spring fixed to the rotating shaft and the other end of the spring fixed to the passive roller.

[0010] In the aforementioned landfill leachate treatment device, the first guide roller and the second guide roller are at the same height, and the distance between the first guide roller and the bottom of the sedimentation tank is 10%-30% of the maximum water depth of the sedimentation tank.

[0011] In the aforementioned landfill leachate treatment device, the outer circumferential surface of the passive roller is provided with multiple rope grooves, and the traction rope is wound into the corresponding rope grooves.

[0012] In the aforementioned landfill leachate treatment device, the mixer includes a second motor located above the sedimentation tank and a stirring head located inside the sedimentation tank. The stirring head is located above the traction rope, and the output end of the second motor is connected to the stirring head.

[0013] Compared with existing technologies, this invention incorporates a mopping mechanism into the existing sedimentation tank. After the leachate in the sedimentation tank has settled, the mopping mechanism can drag the covering cloth to the side of the settled sludge, allowing the sludge to enter a relatively enclosed space. When the next batch of leachate is pumped into the sedimentation tank and flocculants are added and stirred, the resulting water flow will not significantly impact the sludge at the bottom of the tank, preventing the sludge from being stirred up again and entering the water body. This reduces the sedimentation time of the next batch of leachate. Field statistics show that the sedimentation time can be shortened by about 15%, although this time may fluctuate depending on the type and composition of the leachate. Therefore, this invention has the advantage of improving the leachate treatment speed.

[0014] Furthermore, this utility model has a simple structure and can be obtained by modifying existing sedimentation tanks. It is suitable for the modification of existing sedimentation tanks, and the modification cost is not high. Attached Figure Description

[0015] Figure 1 This is a front view schematic diagram of this utility model.

[0016] Figure 2 This is a schematic diagram of the drive mechanism.

[0017] Figure 3This is a schematic diagram of the tension mechanism.

[0018] Figure 4 This is a schematic diagram of the structure of the first guide roller.

[0019] The labels in the attached diagram are as follows: 1-Sedimentation tank, 2-Agitator, 3-Active roller, 4-Passive roller, 5-Covering cloth, 6-Traction rope, 7-First guide roller, 8-Second guide roller, 9-First support, 10-First sprocket, 11-Chain, 12-Second sprocket, 13-First motor, 14-Shaft, 15-Second support, 16-Spring, 17-Rope groove, 18-Second motor, 19-Agitator head, 20-Wire groove, 21-Third support, 22-Fourth support. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0021] Example. Landfill leachate treatment device, such as Figure 1 As shown, it includes a sedimentation tank 1, and a mixer 2 is installed inside the sedimentation tank 1. Its features are as follows:

[0022] A mopping mechanism is provided on the sedimentation tank 1. The mopping mechanism includes an active roller 3 located on one side of the top of the sedimentation tank 1 and a passive roller 4 located on the other side of the top of the sedimentation tank 1. A drive mechanism is connected to the active roller 3, and a tension mechanism is provided on the passive roller 4. A covering cloth 5 is wound on the active roller 3. The width of the covering cloth 5 is close to the width of the sedimentation tank 1. The covering cloth 5 is connected to the passive roller 4 by multiple parallel traction ropes 6. A first guide roller 7 is provided below the active roller 3, and a second guide roller 8 is provided below the passive roller 4. The first guide roller 7 and the second guide roller 8 are positioned... The first guide roller 7 and the second guide roller 8 are rotatably connected to the wall of the sedimentation tank 1. The first guide roller 7 and the second guide roller 8 are at the same height. The distance between the first guide roller 7 and the bottom of the sedimentation tank 1 is 15% of the maximum water depth of the sedimentation tank 1. The traction rope 6 passes around the bottom of the first guide roller 7 and the bottom of the second guide roller 8. The first guide roller 7 and the second guide roller 8 are provided with grooves 20 corresponding to the position of the traction rope 6. The traction rope 6 is prevented from moving axially through the grooves 20. A wear-resistant steel sleeve can be set at the grooves 20 to prevent the guide roller from being cut by the traction rope 6.

[0023] Both ends of the active roller 3 are provided with a first bracket 9 fixed to the top of the sedimentation tank 1. The active roller 3 is connected to the first bracket 9 by bearings. The driving mechanism includes a first sprocket 10 connected to one end of the active roller 3. The first sprocket 10 is connected to a second sprocket 12 through a chain 11. The sedimentation tank 1 is provided with a first motor 13 whose output end is connected to the second sprocket 12. The first motor 13 is connected to the sedimentation tank 1 through a fourth bracket 22.

[0024] The passive roller 4 has a tubular structure. The tension mechanism includes a rotating shaft 14 located inside the passive roller 4. Both ends of the passive roller 4 are connected to the rotating shaft 14 by bearings. Both ends of the rotating shaft 14 extend out of the passive roller 4. Both ends of the rotating shaft 14 are provided with a second bracket 15 fixed to the top of the sedimentation tank 1. A spiral spring 16 is provided between the rotating shaft 14 and the passive roller 4. One end of the spring 16 is fixed to the rotating shaft 14, and the other end of the spring 16 is fixed to the passive roller 4.

[0025] Preferably, the outer circumferential surface of the passive roller 4 is provided with multiple rope grooves 17, and the traction rope 6 is wound into the corresponding rope grooves 17, so that the covering cloth 5 is more flat when it is wound around the passive roller 4.

[0026] The mixer 2 includes a second motor 18 located above the sedimentation tank 1 and a stirring head 19 located inside the sedimentation tank 1. The stirring head 19 is located above the traction rope 6. The output end of the second motor 18 is connected to the stirring head 19. The second motor 18 is connected to the sedimentation tank 1 through a third bracket 21.

[0027] Both the first motor 13 and the second motor 18 are geared motors, and the first motor 13 has a power-off self-locking function.

[0028] Usage: In the initial state, such as Figure 1 As shown, before the covering cloth 5 enters the water body, the leachate is pumped into the sedimentation tank 1, flocculant is added, the second motor 18 is turned on for a certain period of time, and the stirring head 19 is rotated for a certain period of time to make the flocculant and leachate mix evenly, and then allowed to settle.

[0029] After sedimentation, the first motor 13 is started to rotate forward, causing the second sprocket 12 to rotate. The second sprocket 12 drives the first sprocket 10 to rotate via the chain 11. The first sprocket 10 drives the drive roller 3 to rotate, causing the cover cloth 5 to detach from the drive roller 3. Under the preload of the spring 16, the traction rope 6 drags the cover cloth 5 through the first guide roller 7 and the second guide roller 8 in sequence. The cover cloth 5 can move upward a certain distance after passing the second guide roller 8, or it can reach the passive roller 4. At this time, the sedimented sludge is located below the cover cloth 5, in a relatively enclosed space. During the process of pumping out the leachate that has settled in the sedimentation tank 1 and pumping the leachate from the next tank back into the sedimentation tank 1 with the addition of flocculant and stirring, the sludge at the bottom is not easily disturbed and rises, and is not easily re-entering the water body, thus accelerating the sedimentation speed of the new tank of leachate. After stirring, the second motor 13 is started to rotate in reverse, causing the cover cloth 5 to leave the water body, so that the sludge that has settled again can fall smoothly to the bottom of the sedimentation tank 1. This process continues until the accumulated sludge is almost touching the guide rollers, at which point the sludge in sedimentation tank 1 is cleaned in one go.

[0030] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A landfill leachate treatment device, comprising a sedimentation tank (1), wherein a stirrer (2) is provided inside the sedimentation tank (1), characterized in that: A mopping mechanism is provided on the sedimentation tank (1). The mopping mechanism includes an active roller (3) located on one side of the top of the sedimentation tank (1) and a passive roller (4) located on the other side of the top of the sedimentation tank (1). A drive mechanism is connected to the active roller (3), and a tension mechanism is provided on the passive roller (4). A covering cloth (5) is wound on the active roller (3). The covering cloth (5) is connected to the passive roller (4) through multiple parallel traction ropes (6). A first guide roller (7) is provided below the active roller (3), and a second guide roller (8) is provided below the passive roller (4). The first guide roller (7) and the second guide roller (8) are both located inside the sedimentation tank (1) and at the lower part of the sedimentation tank (1). The traction rope (6) passes around the bottom of the first guide roller (7) and the bottom of the second guide roller (8).

2. The landfill leachate treatment device according to claim 1, characterized in that: Both ends of the active roller (3) are provided with a first bracket (9) fixed to the sedimentation tank (1). The active roller (3) is connected to the first bracket (9) by a bearing. The driving mechanism includes a first sprocket (10) connected to one end of the active roller (3). The first sprocket (10) is connected to a second sprocket (12) through a chain (11). The sedimentation tank (1) is provided with a first motor (13) whose output end is connected to the second sprocket (12).

3. The landfill leachate treatment device according to claim 1, characterized in that: The passive roller (4) has a tubular structure. The tension mechanism includes a rotating shaft (14) located inside the passive roller (4). Both ends of the passive roller (4) are connected to the rotating shaft (14) bearings. Both ends of the rotating shaft (14) extend out of the passive roller (4). Both ends of the rotating shaft (14) are provided with a second bracket (15) fixed to the sedimentation tank (1). A spiral spring (16) is provided between the rotating shaft (14) and the passive roller (4). One end of the spring (16) is fixed to the rotating shaft (14), and the other end of the spring (16) is fixed to the passive roller (4).

4. The landfill leachate treatment device according to claim 1, characterized in that: The first guide roller (7) and the second guide roller (8) are at the same height, and the distance between the first guide roller (7) and the bottom of the sedimentation tank (1) is 10%-30% of the maximum water depth of the sedimentation tank (1).

5. The landfill leachate treatment device according to claim 1, characterized in that: The passive roller (4) has multiple rope grooves (17) on its outer circumferential surface, and the traction rope (6) is wound into the corresponding rope groove (17).

6. The landfill leachate treatment device according to claim 1, characterized in that: The mixer (2) includes a second motor (18) located above the sedimentation tank (1) and a stirring head (19) located inside the sedimentation tank (1). The stirring head (19) is located above the traction rope (6), and the output end of the second motor (18) is connected to the stirring head (19).

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