A leachate pretreatment device

Abstract

The application discloses a landfill leachate pretreatment device, which comprises a filter box, a conveying mechanism is connected to the lower end of the filter box, a protection box is installed on one side of the filter box, a traction mechanism is arranged in the protection box, a filter barrel is connected to one end of the traction mechanism and located in the filter box, a buffer mechanism is connected to one end of the filter barrel, a conical separation barrel is installed on the upper end of the filter box, lifting mechanisms are installed on the two sides of the upper end of the conical separation barrel, a dispersant spraying mechanism is installed on the lifting mechanisms, a spraying mechanism is connected to the lower end of the conical separation barrel and corresponds to the filter barrel. The application can effectively decompose colloidal pollutants, reduce micron-sized suspended matters, solve the problems of suspended matters and metal residues, avoid the problem of easy scaling of static filtering devices, reduce the frequency of manual cleaning, reduce the frequency of shutdown cleaning of filter residues, ensure continuous operation of the device, and reduce maintenance costs.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of landfill leachate pretreatment, and particularly relates to a landfill leachate pretreatment device. BACKGROUND

[0002] In the process of treating landfill leachate, the landfill leachate needs to be filtered and collected in advance. However, the current treatment device has the following problems due to its simple structure.

[0003] 1. Suspended solids and metal residues: the traditional pretreatment device (such as a filter tank or a sediment tank) has low interception efficiency for micron-sized suspended solids and metal ions, which easily leads to clogging of a subsequent membrane system (referring to the problem of DTRO membrane pollution);

[0004] 2. Inhomogeneous mixing of reagents: chemical pretreatment has the problems of excessive addition of reagents or inhomogeneous dispersion of reagents, which produces secondary pollution;

[0005] 3. Insufficient dynamic separation: a static filtration device is prone to scaling and needs to be cleaned frequently by manual operation;

[0006] 4. Low filtration efficiency: a single-layer fixed filter screen is prone to clogging, which limits the treatment capacity;

[0007] 5. High maintenance cost: the device needs to be frequently stopped for cleaning of filter residues, which affects continuous operation.

[0008] Therefore, the present application provides a landfill leachate pretreatment device to solve the above problems. SUMMARY

[0009] The present application aims to solve the problems in the prior art and provides a landfill leachate pretreatment device.

[0010] To achieve the above object, the present application adopts the following technical scheme:

[0011] The present application provides a landfill leachate pretreatment device, which comprises a filter tank, a connecting joint connected to the lower end of the filter tank, an output pipe connected to one end of the connecting joint, a protection tank installed on one side of the filter tank, a traction mechanism arranged in the protection tank, a filter barrel connected to one end of the traction mechanism and located in the filter tank, a buffer mechanism connected to one end of the filter barrel, a conical separation barrel installed on the upper end of the filter tank, lifting mechanisms installed on both sides of the upper end of the conical separation barrel, a dispersant spraying mechanism installed on the lifting mechanisms, a jetting mechanism connected to the lower end of the conical separation barrel and corresponding to the filter barrel, and a magnetic separation mechanism arranged in the conical separation barrel.

[0012] Preferably, the conveying mechanism comprises a connecting joint connected to the lower end of the filter tank, and the connecting joint is connected to the output pipe at one end.

[0013] Preferably, the traction mechanism comprises a drive motor mounted on one side in the protection box, the output shaft of the drive motor is connected with a rotating disc, one side of the rotating disc is rotatably connected with a rotating rod, one end of the rotating rod is rotatably connected with a moving plate, both sides of the moving plate are fixedly connected with sliding blocks, opposite side walls in the protection box are both provided with sliding grooves, one sliding block on the same side is mounted in one sliding groove on the same side, one end of the moving plate is fixedly connected with a pull rod, the pull rod penetrates through the side walls of the protection box and the filter box and is fixed on one side of the filter barrel.

[0014] Preferably, the buffer mechanism comprises two guide rods fixed on the other side of the filter barrel, springs are sleeved on the guide rods, one side of the upper end of the filter box is fixedly connected with a fixed plate, the two guide rods penetrate through the fixed plate and extend to one side of the fixed plate, and one end of the spring abuts against one side of the fixed plate.

[0015] Preferably, the lifting mechanism comprises a fixed ring fixed on a circumferential side wall of the conical separation barrel, both sides of the upper end of the fixed ring are fixedly connected with hydraulic cylinders, the piston rods of the two hydraulic cylinders are fixedly connected with a top plate at the tail ends, the lower end of the top plate is fixedly connected with a closing plate at the middle, the upper end of the conical separation barrel is provided with an opening, and the closing plate and the opening are corresponding.

[0016] Preferably, the dispersant spraying mechanism comprises a spray pipe fixedly connected to the middle of the lower end of the closing plate, a plurality of spray holes are equidistantly arranged on a circumferential side wall of the spray pipe, one side of the filter box is provided with a dispersant storage tank, a conveying pump is mounted on one side of the dispersant storage tank, the conveying pump is connected with a dispersant conveying pipe, and one end of the dispersant conveying pipe penetrates through the side wall of the top plate and is connected to the upper end of the spray pipe.

[0017] Preferably, the spraying mechanism comprises a connecting pipe connected to the bottom of the conical separation barrel, and a Venturi nozzle is connected to both sides of the lower end of the connecting pipe and corresponds to the filter barrel.

[0018] Preferably, the magnetic separation mechanism comprises helical flow guides fixed equidistantly on a circumferential side wall in the conical separation barrel, a plurality of adsorption magnetic blocks are arranged staggeredly between the helical flow guides, and the adsorption magnetic blocks are arranged in pairs, and one end of the adsorption magnetic block is fixed on one end of the side wall in the conical separation barrel.

[0019] Preferably, one side of the upper end of the conical separation barrel is connected with a liquid inlet pipe, the lower end of the conical separation barrel is connected with a support frame, and the lower end of the support frame is fixed on the upper end of the filter box.

[0020] Preferably, one side of the filter box is hingedly connected with a sealing door, one side of the filter barrel is hingedly connected with a cover, and the cover corresponds to the sealing door.

[0021] In the present application, the processing step is:

[0022] S1, leachate introduction and preliminary treatment: the landfill leachate enters the conical separation barrel through the inlet pipe and rotates downward under the guidance of the spiral guide plate. At the same time, the biological dispersant in the dispersant storage tank is introduced into the spray pipe through the delivery pump and the dispersant delivery pipe, and then continuously released into the leachate through the spray hole to decompose colloidal pollutants;

[0023] S2, magnetic adsorption separation: in the conical separation barrel, metal particles are adsorbed on the surface of the magnetic block in the gradient magnetic field formed by the adsorption magnetic block, realizing the separation of metal particles and leachate, and the separation efficiency is greater than 85%;

[0024] S3, atomization injection: the guide liquid after preliminary treatment and magnetic adsorption separation flows to the venturi nozzle through the connecting pipe, forms turbulent flow through the venturi nozzle, and breaks the residual flocs;

[0025] S4, dynamic filtration: the driving motor drives the rotating disc to rotate, the moving plate moves reciprocally under the cooperation of the sliding block and the sliding groove through the rotating rod, and then the filter barrel moves with an amplitude of 5-10 cm and a frequency of 2 Hz through the pull rod. The leachate sprayed from the injection mechanism enters the filter barrel for filtration, realizing high retention rate, and the SS removal rate is greater than 92%, and preventing the filter barrel from being blocked;

[0026] S5, filtered liquid output: the filtered liquid is discharged through the joint and the output pipe;

[0027] S6, maintenance and cleaning: when it is necessary to clean the filter residue in the filter barrel, the sealing door and the cover can be opened for cleaning.

[0028] The present application has the following advantages:

[0029] 1. Through the cooperation of the spiral guide plate and the biological dispersant, colloidal pollutants can be effectively decomposed, and micron-sized suspended solids can be reduced;

[0030] 2. Through the magnetic adsorption separation of the adsorption magnetic block, metal ions can be efficiently removed, the retention efficiency of metal ions can be improved, the subsequent membrane system can be prevented from being blocked, and the risk of membrane pollution can be reduced;

[0031] 3. The biological dispersant is uniformly sprayed through the spray pipe and the spray hole, avoiding the problems of excessive dosage or uneven distribution of chemicals in chemical pretreatment, and reducing secondary pollution;

[0032] 4. The swinging dynamic filtration of the filter barrel avoids the problem of easy scaling of static filtration devices, and reduces the frequency of manual cleaning;

[0033] 5. Through the dynamic filtering mode of the swing type filtering barrel, high retention rate is realized, the filtering efficiency is improved, the problem that the processing capacity is limited due to the easy blocking of the single layer fixed filter screen is solved, the dynamic filtering mode effectively prevents the filtering barrel from being blocked, the frequency of cleaning filter residues is reduced, the continuous operation of the device is ensured, and the maintenance cost is reduced.

[0034] In conclusion, the present application can effectively decompose colloidal pollutants, reduce micron-sized suspended solids, solve the problems of suspended solids and metal residues, avoid the problem of easy scaling of static filtering devices, reduce the frequency of manual cleaning, reduce the frequency of cleaning filter residues, ensure the continuous operation of the device, and reduce the maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 The enclosed plate opening structure of the present application is shown in the figure;

[0036] Figure 2 The structure of the present application is shown in the figure;

[0037] Figure 3 The lifting mechanism and dispersant spraying mechanism connection structure of the present application is shown in the figure;

[0038] Figure 4 The traction mechanism and filtering barrel connection structure of the present application is shown in the figure;

[0039] Figure 5 The filtering barrel structure of the present application is shown in the figure;

[0040] Figure 6 The adsorbing magnetic block setting structure of the present application is shown in the figure.

[0041] In the figure: 1 dispersant conveying pipe, 2 liquid inlet pipe, 3 top plate, 4 enclosed plate, 5 adsorbing magnetic block, 6 spray pipe, 7 spiral guide plate, 8 hydraulic cylinder, 9 fixed ring, 10 support frame, 11 filtering box, 12 protection box, 13 sealing door, 14 output pipe, 15 joint, 16 dispersant storage tank, 17 conical separation barrel, 18 spray hole, 19 filtering barrel, 20 cover, 21 fixed plate, 22 guide rod, 23 spring, 24 connecting pipe, 25 Venturi nozzle, 26 pull rod, 27 sliding groove, 28 moving plate, 29 rotating rod, 30 rotating disc, 31 sliding block. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all.

[0043] REFERENCE Figures 1-6The utility model provides a kind of landfill leachate pretreatment device, including filter box 11, the lower end of filter box 11 is connected with conveying mechanism, one side of filter box 11 is equipped with protection box 12, traction mechanism is equipped in protection box 12, one end of traction mechanism is connected with filter barrel 19, and filter barrel 19 is located in filter box 11, one end of filter barrel 19 is connected with buffer mechanism, the upper end of filter box 11 is equipped with conical separation barrel 17, both sides of the upper end of conical separation barrel 17 are equipped with lifting mechanism, and dispersing agent spraying mechanism is installed on lifting mechanism, the lower end of conical separation barrel 17 is connected with injection mechanism, and injection mechanism and filter barrel 19 correspond, magnetic attraction separation mechanism is equipped in conical separation barrel 17, by the collaborative work of each mechanism and reasonable processing step, landfill leachate can be effectively pretreated, processing efficiency and quality are improved, while the maintenance and management of device are facilitated.

[0044] Conveying mechanism includes connector 15 connected at the lower end of filter box 11, one end of connector 15 is connected with output pipe 14, connector 15 plays the role of connecting filter box 11 and output pipe 14, to ensure that filtered liquid can be smoothly discharged from filter box 11 to the outside of the device.

[0045] Traction mechanism includes drive motor installed in one side in protection box 12, the output shaft end of drive motor is connected with rotating disc 30, one side of rotating disc 30 is rotatably connected with rotating rod 29, one end of rotating rod 29 is rotatably connected with moving plate 28, both sides of moving plate 28 are fixed with sliding block 31, opposite side walls in protection box 12 are each equipped with sliding groove 27, one sliding block 31 on the same side is installed in one sliding groove 27 on the same side, one end of moving plate 28 is fixed with pull rod 26, pull rod 26 penetrates the side wall of protection box 12 and filter box 11 and is fixed at one side of filter barrel 19, the output shaft of drive motor drives rotating disc 30 to rotate, the rotation of rotating disc 30 is converted into the linear motion of moving plate 28 through rotating rod 29.The sliding block 31 on both sides of moving plate 28 slides in the sliding groove 27 on the opposite side wall of protection box 12, to ensure the stability of moving plate 28 movement.Pull rod 26 transmits the movement of moving plate 28 to filter barrel 19, so that it can move in a predetermined manner.

[0046] Buffer mechanism includes two guide rods 22 fixed on the other side of filter barrel 19, spring 23 is sleeved on guide rod 22, fixed plate 21 is fixed on one side of the upper end of filter box 11, two guide rods 22 penetrate fixed plate 21 and extend to one side of fixed plate 21, one end of spring 23 abuts on one side of fixed plate 21, when filter barrel 19 moves, guide rod 22 slides on fixed plate 21, spring 23 plays a buffering role, reduces the impact force generated when filter barrel 19 moves, protects the structural stability of the device.

[0047] The lifting mechanism comprises a fixed ring 9 fixed on the side wall of the conical separation barrel 17, hydraulic cylinders 8 fixed on both sides of the upper end of the fixed ring 9, a top plate 3 fixed on the ends of the piston rods of the two hydraulic cylinders 8, a closing plate 4 fixed on the lower end of the top plate 3, an opening provided on the upper end of the conical separation barrel 17, the closing plate 4 corresponding to the opening, the piston rods of the hydraulic cylinders 8 being capable of driving the top plate 3 and the closing plate 4 to move up and down, the closing plate 4 corresponding to the opening on the upper end of the conical separation barrel 17, the opening being capable of being closed or opened, thereby facilitating the maintenance and cleaning of the device.

[0048] The dispersant spraying mechanism comprises a spray pipe 6 fixed on the middle of the lower end of the closing plate 4, a plurality of spray holes 18 provided on the side wall of the spray pipe 6 at equal intervals, a dispersant storage tank 16 provided on one side of the filter box 11, a conveying pump installed on one side of the dispersant storage tank 16, a dispersant conveying pipe 1 connected to the conveying pump, one end of the dispersant conveying pipe 1 penetrating through the side wall of the top plate 3 and connected to the upper end of the spray pipe 6, and the conveying pump conveying the biological dispersant in the dispersant storage tank 16 to the spray pipe 6 through the dispersant conveying pipe 1, and then uniformly spraying the biological dispersant into the leachate through the spray holes 18, so as to decompose the colloidal pollutants in the leachate.

[0049] The spraying mechanism comprises a connecting pipe 24 connected to the bottom of the conical separation barrel 17, and a Venturi nozzle 25 connected to the lower end of the connecting pipe 24 on both sides, the Venturi nozzle 25 corresponding to the filter barrel 19, the flow guide liquid after the preliminary treatment and magnetic adsorption separation flowing to the Venturi nozzle 25 through the connecting pipe 24, the Venturi nozzle 25 accelerating the flow of the liquid by using the special structure, forming turbulent flow, and being capable of effectively breaking the residual floc.

[0050] The magnetic adsorption separation mechanism comprises spiral flow guide plates 7 fixed on the side wall of the conical separation barrel 17 at equal intervals, a plurality of adsorption magnetic blocks 5 provided between the spiral flow guide plates 7 in a staggered manner, the adsorption magnetic blocks 5 being arranged in pairs, one end of the adsorption magnetic blocks 5 being fixed on one end of the side wall of the conical separation barrel 17, and the metal particles being adsorbed to the surface of the magnetic blocks in the gradient magnetic field formed by the adsorption magnetic blocks 5 in the process of the leachate rotating downward along the spiral flow guide plates 7, so as to realize the separation of the metal particles and the leachate.

[0051] One side of the upper end of the conical separation barrel 17 is connected with a liquid inlet pipe 2, the lower end of the conical separation barrel 17 is connected with a support frame 10, the lower end of the support frame 10 is fixed on the upper end of the filter box 11, one side of the filter box 11 is hingedly connected with a sealing door 13, one side of the filter barrel 19 is hingedly connected with a cover 20, the cover 20 corresponding to the sealing door 13, thereby facilitating the regular maintenance and cleaning.

[0052] In the present application, the processing steps are as follows:

[0053] S1, leachate introduction and preliminary treatment: the landfill leachate enters the conical separation barrel 17 through the inlet pipe 2 and rotates downward under the guidance of the spiral guide plate 7. At the same time, the biological dispersant in the dispersant storage tank 16 enters the spray pipe 6 through the delivery pump and the dispersant delivery pipe 1, and is continuously released into the leachate through the spray hole 18 to decompose colloidal pollutants;

[0054] S2, magnetic adsorption separation: in the conical separation barrel 17, metal particles are adsorbed on the surface of the magnetic block under the gradient magnetic field formed by the adsorption magnetic block 5, realizing the separation of metal particles and leachate, and the separation efficiency is greater than 85%;

[0055] S3, atomization injection: the flow guide liquid after preliminary treatment and magnetic adsorption separation flows to the venturi nozzle 25 through the connecting pipe 24, forms turbulent flow through the venturi nozzle, and breaks the residual flocs;

[0056] S4, dynamic filtration: the driving motor drives the rotating disc 30 to rotate, the moving plate 28 moves reciprocally under the cooperation of the sliding block 31 and the sliding groove 27 through the rotating rod 29, and then the filter barrel 19 moves with an amplitude of 5-10 cm and a frequency of 2 Hz through the pull rod 26. The leachate sprayed from the injection mechanism enters the filter barrel 19 for filtration, realizing high retention rate and SS removal rate greater than 92%, and preventing the filter barrel from being blocked;

[0057] S5, filtered liquid output: the filtered liquid is discharged through the joint 15 and the output pipe 14;

[0058] S6, maintenance and cleaning: when it is necessary to clean the filter residue in the filter barrel 19, the sealing door 13 and the cover 20 can be opened for cleaning.

[0059] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A leachate pretreatment device for landfill leachate, comprising a filter tank (11), characterized in that, The lower end of the filter box (11) is connected with a conveying mechanism, one side of the filter box (11) is provided with a protection box (12), the protection box (12) is provided with a traction mechanism, one end of the traction mechanism is connected with a filter barrel (19), and the filter barrel (19) is located in the filter box (11), one end of the filter barrel (19) is connected with a buffer mechanism, the upper end of the filter box (11) is provided with a conical separation barrel (17), the upper end of the conical separation barrel (17) is provided with a lifting mechanism on both sides, the lifting mechanism is provided with a dispersant spraying mechanism, the lower end of the conical separation barrel (17) is connected with a spraying mechanism, and the spraying mechanism corresponds to the filter barrel (19), the conical separation barrel (17) is provided with a magnetic separation mechanism; The traction mechanism comprises a driving motor mounted on one side in the protection box (12), the output shaft of the driving motor is connected with a rotating disc (30), one side of the rotating disc (30) is rotatably connected with a rotating rod (29), one end of the rotating rod (29) is rotatably connected with a moving plate (28), both sides of the moving plate (28) are fixedly provided with sliding blocks (31), opposite side walls in the protection box (12) are provided with sliding grooves (27), one sliding block (31) on the same side is mounted in one sliding groove (27) on the same side, one end of the moving plate (28) is fixedly provided with a pull rod (26), the pull rod (26) penetrates the side walls of the protection box (12) and the filter box (11) and is fixedly provided on one side of the filter barrel (19); The buffer mechanism comprises two guide rods (22) fixedly provided on the other side of the filter barrel (19), the guide rods (22) are provided with springs (23), one side of the upper end of the filter box (11) is fixedly provided with a fixed plate (21), the two guide rods (22) penetrate the fixed plate (21) and extend to one side of the fixed plate (21), and one end of the spring (23) abuts against one side of the fixed plate (21); The lifting mechanism comprises a fixed ring (9) fixedly provided on the side wall of the conical separation barrel (17), the upper ends of the fixed ring (9) are fixedly provided with hydraulic cylinders (8), the piston rods of the two hydraulic cylinders (8) are fixedly provided with a top plate (3), the lower end of the top plate (3) is fixedly provided with a closing plate (4), and the upper end of the conical separation barrel (17) is provided with an opening, and the closing plate (4) corresponds to the opening; The magnetic separation mechanism comprises helical guide plates (7) fixedly provided at equal intervals on the side wall of the conical separation barrel (17), a plurality of adsorption magnetic blocks (5) are arranged in an alternating manner between the helical guide plates (7), and the adsorption magnetic blocks (5) are arranged in pairs, and one end of the adsorption magnetic block (5) is fixedly provided on one end of the side wall in the conical separation barrel (17).

2. The device for pretreatment of landfill leachate according to claim 1, characterized in that: The conveying mechanism comprises a connector (15) connected to the lower end of the filter box (11), and one end of the connector (15) is connected with an output pipe (14).

3. The device for pretreatment of landfill leachate according to claim 1, characterized in that: The dispersant spraying mechanism comprises a spray pipe (6) fixed at the middle of the lower end of the closing plate (4), a plurality of spray holes (18) are equidistantly arranged on the peripheral side wall of the spray pipe (6), one side of the filter box (11) is provided with a dispersant storage tank (16), a conveying pump is mounted on one side of the dispersant storage tank (16), a dispersant conveying pipe (1) is connected to the conveying pump, and one end of the dispersant conveying pipe (1) penetrates through the side wall of the top plate (3) and is connected to the upper end of the spray pipe (6).

4. The device for pretreatment of landfill leachate according to claim 3, characterized in that: The spraying mechanism comprises a connecting pipe (24) connected to the bottom of the conical separation barrel (17), Venturi nozzles (25) are connected to the lower ends of the two sides of the connecting pipe (24), and the Venturi nozzles (25) correspond to the filter barrel (19).

5. The device for pretreatment of landfill leachate according to claim 1, characterized in that: The upper end of the conical separation barrel (17) is connected to a liquid inlet pipe (2), the lower end of the conical separation barrel (17) is connected to a support frame (10), and the lower end of the support frame (10) is fixed to the upper end of the filter box (11).

6. The device for pretreatment of landfill leachate according to claim 1, characterized in that: One side of the filter box (11) is hingedly connected to a sealing door (13), one side of the filter barrel (19) is hingedly connected to a cover (20), and the cover (20) corresponds to the sealing door (13).

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