Resource utilization device and utilization method of landfill leachate reverse osmosis concentrated liquid

Abstract

The invention discloses a resource utilization device for reverse osmosis concentrated liquid of landfill leachate. The sludge dewatering device comprises a sludge storage tank, wherein a lower filter cloth and an upper filter cloth are arranged in the sludge storage tank, and a sludge auxiliary water filtering device is arranged above the lower filter cloth in the sludge storage tank; the sludge auxiliary water filtering device comprises a base and a water filtering cylinder, wherein a mud shoveling area is arranged on the base, and the water filtering cylinder is arranged at the rear side of the mud shoveling area, and each group of water filtering cylinders is rotatably arranged on the base and one end of the opening faces the mud shoveling area, and a driving component for driving the base to reciprocate along the front and rear direction of the lower filter cloth is arranged on the sludge storage tank, and a first driving rotation structure for driving the base to rotate and a second driving rotation structure for driving the water filtering cylinder to rotate are also arranged on the sludge storage tank, and a door plate is arranged on the bottom end of the water filtering cylinder, and the water filtering cylinder rotates to throw out the water on the sludge so that the sludge is discharged from the door plate to the surface of the lower filter cloth. The sludge on the lower filter cloth can be quickly dehydrated to prevent water from accumulating on the upper surface of the sludge and being unable to pass through the lower filter cloth.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a resource utilization device for reverse osmosis concentrated liquid of landfill leachate and a utilization method thereof. Background Art

[0002] The leachate contains a large amount of sodium salt, potassium salt, calcium salt, magnesium salt, etc., and mostly exists in the form of chloride and sulfate. Its salt concentration (TDS) is usually as high as 10000mg / L or more, and the total hardness in the leachate is usually above 3000~5000mg / L. In actual operation, due to the high alkalinity and high hardness of the garbage leachate, it is easy to scale in the inlet pipe, outlet pipe and water distribution pipe of the anaerobic tank, which brings certain difficulties to long-term normal operation. In addition, the high salt content and high hardness of the leachate will also cause difficulties in the operation of the subsequent membrane system. The concentrated liquid side of the membrane is prone to scaling, resulting in problems such as low water production rate and reduced membrane life.

[0003] At present, the main method for removing hardness from leachate in waste incineration plants is chemical precipitation + membrane filtration. This method is used to remove hardness in MBR produced water, but it cannot solve the scaling problem of anaerobic systems. It also consumes a lot of reagents and has high operating energy consumption. The recovery rate of the membrane process used in the deep treatment of leachate is generally 70%~80%, and 20%~30% of the concentrate needs to be treated. The above problems have caused great difficulties for the zero discharge and reuse treatment of leachate.

[0004] There is a method for resource recovery of leachate from a garbage incineration plant. The treated water is reused as circulating cooling water, and ammonia nitrogen in the leachate is recovered by a deammonification device. The biogas produced by anaerobism and the mud cake after sludge dehydration are transported to the incinerator for incineration. The final concentrated liquid is sent to the plant for disposal, so as to realize resource recovery and zero emission treatment of the leachate. However, when the sludge is dehydrated in the dehydration device, the sludge on the filter cloth is dehydrated by gravity. After the lower filter cloth slowly drives the sludge out of the water surface, since the sludge is spread on the filter cloth, part of the water accumulates on the sludge and is difficult to filter off from the filter cloth under gravity, resulting in poor squeezing effect of the subsequent upper and lower filter cloths on the sludge, making the dehydration effect unsatisfactory, affecting the subsequent incineration of the sludge cake. Summary of the invention

[0005] The purpose of the present invention is to provide a device for resource utilization of landfill leachate reverse osmosis concentrated liquid to solve the above technical problems.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a device for resource utilization of landfill leachate reverse osmosis concentrated liquid, comprising a regulating tank, a pretreatment device, a primary anaerobic device, a secondary anaerobic device, an anaerobic MBR device, a deammoniation device, an A / O-MBR device, a nanofiltration device, an electrodialysis device, and a water production tank connected in sequence, and also comprising a high-pressure reverse osmosis device, an acid-base generating device, and a sludge dewatering device, the sludge dewatering device comprising a sludge storage tank, a lower filter cloth and an upper filter cloth are arranged in the sludge storage tank, the lower filter cloth transports the gravity-dehydrated sludge through the upper filter cloth, and then squeezes and presses each other to obtain a mud cake, the sludge storage tank is provided with a sludge auxiliary water filtration device located above the lower filter cloth, and the sludge auxiliary water filtration device is located on the front side of the upper filter cloth;

[0007] The sludge-assisted water filtration device includes a base and a water filter cartridge, wherein the base is provided with a mud shoveling area, the water filter cartridge is provided at the rear side of the mud shoveling area, and a plurality of water filter cartridges are provided along the length direction of the base, each group of water filter cartridges is rotatably provided on the base and one open end is facing the mud shoveling area, the mud shoveling area is provided with a guide plate between adjacent water filter cartridges, the sludge storage tank is provided with a driving assembly for driving the base to reciprocate along the front and rear directions of the lower filter cloth, the sludge storage tank is also provided with a first driving and rotating structure for driving the base to rotate and a second driving and rotating structure for driving the water filter cartridge to rotate, the sludge is shoveled into the mud shoveling area by the moving base and is guided into the water filter cartridge after the base rotates, the base is provided with a door panel at the bottom end of the water filter cartridge, and the water on the sludge is thrown out by the rotation of the water filter cartridge so that the sludge is discharged from the door panel to the surface of the lower filter cloth.

[0008] Preferably, guide grooves are provided on the two side walls of the sludge storage tank, guide rods are provided on both sides of the base to form a sliding connection with the guide grooves, the driving assembly includes a motor, a driving rod and a connecting plate, the motor is fixed to the top of the side wall of the sludge storage tank, the driving rod is fixed to the output end of the motor and a first reciprocating spiral groove is provided on the outer wall, the upper part of the connecting plate is sleeved on the driving rod and a guide shaft matching the first reciprocating spiral groove is provided, the lower part of the connecting plate is connected to the guide rod, the motor drives the connecting plate to reciprocate and drives the base to reciprocate through the cooperation between the connecting plate and the guide rod, a plate groove for the connecting plate to slide is provided on the wall of the sludge tank, and the plate groove is connected to the guide groove.

[0009] Preferably, the guide groove includes a first guide groove, a lifting chute and a second guide groove connected in sequence. The guide rod slides in the first guide groove to drive the base to move and shovel the sludge to the shoveling area. The guide rod can drive the base to lift and lower through the lifting chute. The first driving structure includes a first tooth area arranged on the inner wall of the bottom of the second guide groove. The guide rod is provided with a first tooth portion that meshes with the first tooth portion area. The guide rod passes through the second guide groove to mesh the first tooth portion with the first tooth portion area and then drives the base to rotate. The guide rod slides up and down and is rotatably arranged on the connecting plate.

[0010] Preferably, a rod groove is provided at the bottom of the connecting plate, a long rod is provided in the rod groove for sliding up and down, a connecting block is provided at the bottom of the long rod, and the guide rod passes through the connecting block and forms a rotational connection with the connecting block.

[0011] Preferably, it also includes a locking assembly for limiting the rotation of the guide rod on the connecting block, the locking assembly limits the rotation of the base when shoveling the sludge on the filter cloth, a locking hole is provided on the outer wall of the guide rod, and the locking assembly includes a locking rod, which is slidable up and down in the long rod and the bottom end is inserted into the locking hole to limit the rotation of the guide rod.

[0012] Preferably, it also includes an unlocking member for driving the locking rod to disengage from the locking hole when the base needs to be rotated, the locking rod is a magnetic rod, and the unlocking member is a strong magnetic strip, the strong magnetic strip is arranged on an inner wall of one side of the plate groove, and the connecting plate is provided with a socket for inserting the strong magnetic strip, when the first tooth portion on the guide rod is ready to engage with the first tooth portion area, one end of the strong magnetic strip is just inserted into the socket and is magnetically attracted to the long rod to drive the locking rod to move up and disengage from the lock.

[0013] Preferably, the second driving structure includes a second tooth area arranged in the second guide groove, and the second tooth area is located on a side of the plate groove away from the first tooth area. The second driving structure also includes a rotating rod rotatably arranged in the guide rod, and the outer wall of the rotating rod is provided with a second tooth portion meshing with the second tooth area. The guide rod moves in the second guide groove so that after the first tooth portion is meshed with the first tooth area, the second tooth portion is meshed with the second tooth area. The second guide groove is located on a side of the first tooth area. An anti-rotation strip is provided on the inner wall. A fitting area is provided on the outer wall of the guide rod. When the second tooth portion is meshed with the second tooth area, the fitting area and the anti-rotation strip are fitted together. The rotating rod is provided with a driving component for driving the water filter cartridge to rotate.

[0014] Preferably, one end of the rotating rod extends into the interior of the base, and a driving tooth portion is provided on the circumferential side of the circumferential outer wall of the water filter cartridge, the driving tooth portion includes a bevel tooth portion and a flat tooth portion, and one end of the rotating rod extending into the interior of the base is provided with a bevel gear meshing with the bevel tooth portion, and adjacent water filter cartridges are meshed through the flat tooth portion.

[0015] Preferably, a scraper is axially slidably arranged inside each group of water filter cartridges, a conical surface is provided at the opening of the scraper, and a door opening member for driving the door panel to open is provided on the scraper.

[0016] A method for resource utilization of landfill leachate reverse osmosis concentrated liquid comprises the following steps:

[0017] Step 1: The leachate is first collected in a regulating tank, and the leachate in the regulating tank is sent to a pretreatment device through a lifting pump. The alkaline solution generated by the acid-base generating device and the primary anaerobic effluent are mixed with the leachate to react, and the pH of the mixed solution is adjusted to 9.7-10.0 to remove most of the total hardness in the leachate. After the reaction, the mixed solution is added with a flocculant and precipitated in a pretreatment sedimentation tank. The effluent of the pretreatment sedimentation tank is further removed of suspended matter and part of ammonia nitrogen by a cyclone flotation device, and the effluent of the cyclone flotation device is stored in a pretreatment water production tank;

[0018] Step 2: The pre-treated water enters the primary anaerobic tank for treatment to remove most of the COD and BOD5 in the leachate. The effluent of the primary anaerobic tank passes through the primary anaerobic degassing tank and the primary anaerobic sedimentation tank to remove the sludge suspended matter in the water. The sludge in the mud hopper of the primary anaerobic sedimentation tank flows back to the primary anaerobic tank. Part of the effluent of the primary anaerobic sedimentation tank flows back to the pretreatment device, and part enters the secondary anaerobic tank to further remove the COD in the leachate. The mixed liquid in the secondary anaerobic tank passes through the anaerobic MBR device for mud and water separation. The water produced by the anaerobic MBR device is sent to the deammoniation device, and the biogas produced by the primary anaerobic tank and the secondary anaerobic tank is sent to the incinerator for incineration treatment;

[0019] Step 3: The anaerobic MBR produced water enters the deammoniation device reaction tank, and the pH of the solution is adjusted to 10.5-11 to further remove the total hardness in the leachate. After the reaction, the mixed solution continues to add flocculants and then precipitates in the deammoniation device sedimentation tank. The effluent of the deammoniation device sedimentation tank is first added with alkaline solution in the pipeline mixer to adjust the pH to about 11.0, and then enters the deammoniation membrane assembly for treatment to remove most of the ammonia nitrogen in the leachate. The ammonia nitrogen is converted into ammonia gas and then absorbed by the acid solution. The acid solution after absorption is converted into ammonium salt solution and stored in the ammonium salt water tank. The effluent of the deammoniation membrane assembly is stored in the deammoniation device produced water tank;

[0020] Step 4: After the pH of the produced water from the deammoniation device is adjusted to about 8.5 using an acid solution in the produced water tank of the deammoniation device, it enters the A / O-MBR device for treatment, and undergoes nitrification and denitrification reactions in the nitrification tank and the denitrification tank to remove COD, BOD5, ammonia nitrogen and total nitrogen in the leachate. The sludge mixed liquid in the membrane pool is separated from the water by the MBR membrane module, and the produced water from the MBR membrane module enters the nanofiltration device;

[0021] Step 5, the produced water of the MBR membrane assembly enters the nanofiltration device for treatment, the concentrated water of the nanofiltration device enters the high-pressure reverse osmosis device for further concentration treatment, the produced water of the nanofiltration device enters the electrodialysis device for treatment, the fresh water of the electrodialysis device and the produced water of the high-pressure reverse osmosis device enter the water production pool together, part of the concentrated water of the electrodialysis device enters the acid-base generating device, and part enters the plant area for consumption, the acid-base generating device uses the electrodialysis concentrated water to generate acid solution and alkaline solution, the alkaline solution is reused in the pretreatment device and the deammoniation device, the acid solution is reused in the deammoniation device, and the fresh water of the acid-base generating device is refluxed to the electrodialysis device;

[0022] Step 6: The sludge discharged from the primary anaerobic device, the anaerobic MBR device and the A / O-MBR device enters the sludge dewatering device for dehydration treatment, the clear liquid after dehydration flows back to the pretreatment device, and the dehydrated sludge cake is sent to the incinerator for incineration treatment.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] A sludge-assisted water filtration device is arranged on the sludge storage tank, and the sludge-assisted water filtration device includes a base and a water filter cartridge, and also includes a driving assembly for driving the base to move forward and backward along the moving direction of the lower filter cloth, so that the base shovels the sludge on the lower filter cloth into the shoveling area during the reciprocating movement, and after the base rotates, the sludge is introduced into each group of water filter cartridges, and the water on the sludge is centrifugally removed by the rotation of the water filter cartridge, and finally the sludge is discharged onto the lower filter cloth, so that the sludge can be quickly dehydrated, the stroke of the equipment through gravity water filtration can be reduced, and the subsequent squeezing effect of the sludge between the upper filter cloth and the lower filter cloth can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram showing the position of the sludge-assisted water filtration device of the present invention;

[0027] Figure 2 It is a structural schematic diagram of the present invention highlighting the guide groove;

[0028] Figure 3 yes Figure 2 A magnified schematic diagram of part A;

[0029] Figure 4 is an exploded schematic diagram of the sludge-assisted water filtration device of the present invention;

[0030] Figure 5 yes Figure 4 A magnified schematic diagram of part B;

[0031] Figure 6 It is an exploded schematic diagram of the rotating rod, bevel gear and driving gear of the present invention;

[0032] Figure 7 It is a schematic structural diagram of the present invention highlighting one side of the water outlet tank of the sludge auxiliary water filtering device;

[0033] Figure 8 It is a flow chart of the second embodiment of the present invention.

[0034] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0035] 1. Sludge dewatering device; 2. Sludge storage tank; 3. Lower filter cloth; 301. Front filter cloth; 302. Rear filter cloth; 4. Upper filter cloth; 5. Sludge auxiliary water filtering device; 6. Base; 7. Water filter cylinder; 8. Mud shoveling area; 9. Guide plate; 10. Driving assembly; 101. Motor; 102. Driving rod; 103. Connecting plate; 111. First tooth area; 112. First tooth; 121. Second tooth area; 122. Second tooth; 123. Rotating rod; 13. Door plate; 14. Cylinder groove; 15. Water outlet groove; 16. Guide groove; 161. First guide groove; 162. Lifting chute; 163. First tooth; Second guide groove; 17, guide rod; 18, first reciprocating spiral groove; 19, guide shaft; 20, plate groove; 21, rod groove; 22, long rod; 23, connecting block; 24, locking rod; 25, locking hole; 26, locking rod groove; 27, strong magnetic strip; 28, socket; 29, abutment plate; 30, spring; 31, anti-rotation strip; 32, fitting area; 33, driving tooth portion; 331, flat tooth portion; 332, bevel tooth portion; 34, bevel gear; 35, groove portion; 36, scraper; 37, conical surface; 38, positioning plate; 39, slide groove; 40, U-shaped rod; 41, short shaft; 42, second reciprocating spiral groove; 43, push rod. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] See also Figure 1-7 , the present invention provides a technical solution:

[0038] Embodiment 1

[0039] See also Figure 8The resource utilization device of landfill leachate reverse osmosis concentrated liquid includes a regulating tank, a pretreatment device, a primary anaerobic device, a secondary anaerobic device, an anaerobic MBR device, a deammoniation device, an A / O-MBR device, a nanofiltration device, an electrodialysis device, and a water production tank connected in sequence, and also includes a high-pressure reverse osmosis device, an acid-base generating device and a sludge dewatering device 1, wherein the regulating tank, the pretreatment device, the primary anaerobic device, the secondary anaerobic device, the anaerobic MBR device, the deammoniation device, the A / O-MBR device, the nanofiltration device, the electrodialysis device, the water production tank connected in sequence, and also includes a high-pressure reverse osmosis device and an acid-base generating device are all existing technologies, so they are not elaborated in detail.

[0040] See also Figure 1 , 4The technical scheme mainly improves the sludge dewatering device 1. The sludge dewatering device 1 includes a sludge storage tank 2. A lower filter cloth 3 and an upper filter cloth 4 are arranged in the sludge storage tank 2. The lower filter cloth 3 transports the sludge that has been dehydrated by gravity and passes through the upper filter cloth 4 to squeeze and squeeze each other to obtain a mud cake. After the upper filter cloth 4 and the lower filter cloth 3 squeeze and filter the sludge, the sludge will form a mud cake and be discharged. The squeezing and filtering of the sludge by the upper filter cloth 4 and the lower filter cloth 3 and the transmission of the lower filter cloth 3 and the upper filter cloth 4 are all existing technologies and will not be elaborated. The sludge storage tank 2 is located above the lower filter cloth 3 and is provided with a sludge auxiliary water filtering device 5, and the sludge auxiliary water filtering device 5 is located on the front side of the upper filter cloth 4. The sludge-assisted water filtering device 5 includes a base 6 and a water filter cartridge 7. The wall of the water filter cartridge 7 is a water-permeable plate. The base 6 is provided with a shoveling area 8. The front opening of the shoveling area 8 of the base 6 is opposite to the sludge feeding direction driven by the lower filter cloth 3, and the bottom of the opening of the shoveling area 8 is a thin wall. When the base 6 moves toward the side opposite to the feeding direction of the lower filter cloth 3, the sludge can be shoveled into the shoveling area 8. The water filter cartridge 7 is arranged at the rear side of the shoveling area 8, and a plurality of groups are arranged along the length direction of the base 6. Each group of water filter cartridges 7 is rotatably arranged on the base 6 and one end of the opening faces the shoveling area 8. The shoveling area 8 A guide plate 9 is provided between adjacent water filter cartridges 7, a driving assembly 10 is provided on the sludge storage tank 2 for driving the base 6 to reciprocate along the front and rear directions of the lower filter cloth 3, and a first driving rotation joint for driving the base 6 to rotate and a second driving rotation structure for driving the water filter cartridge 7 to rotate are also provided on the sludge storage tank 2. The sludge is shoveled into the shoveling area 8 by the moving base 6 and is guided into the water filter cartridge 7 after the base 6 rotates, wherein the bottom inner wall of the shoveling area 8 is just located at the radial position of the water filter cartridge 7, so that the maximum opening position of the water filter cartridge 7 is flush with the bottom inner wall of the shoveling area 8, which is helpful for the sludge Enter the water filter cartridge 7, the base 6 is located at the bottom of the water filter cartridge 7 and is hinged to set a door panel 13, and a torsion spring (not shown in the figure) is set at the hinge between the door panel 13 and the base 6. A certain thrust is required to open the door panel 13, and the water on the sludge is thrown out after the water filter cartridge 7 rotates, so that the sludge is discharged from the door panel 13 to the surface of the lower filter cloth 3. It should be noted that: a cylinder groove 14 for the rotational connection of the water filter cartridge 7 is set on the base 6, and the lower inner wall of the cylinder groove 14 expands outward, so that the water can be thrown out when the water filter cartridge 7 rotates, and the base 6 is located on the side of the door panel 13. The water outlet trough 15 is convenient for the water filter cartridge 7 The thrown-out water flows onto the lower filter cloth 3; it should also be noted that: the lower filter cloth 3 is divided into a front filter cloth 301 and a rear filter cloth 302, the front filter cloth 301 is tilted upward and is used to bring the sludge out of the sludge storage tank 2, and the rear filter cloth 302 is tilted downward (the lowest point of the rear filter cloth 302 does not contact the water in the sludge storage tank 2), when shoveling mud on the base 6, the sludge can be better shoveled into the mud shoveling area 8, and the bottom position of the mud shoveling area 8 can be slightly lower than the lower filter cloth 3, which has a squeezing effect on the lower filter cloth 3 without damaging the lower filter cloth 3, and also improves the mud shoveling effect.

[0041] See also Figure 1 , 24. Guide grooves 16 are provided on the two side walls of the sludge storage tank 2. Guide rods 17 are provided on the two sides of the base 6 to form a sliding connection with the guide grooves 16. The driving assembly 10 includes a motor 101, a driving rod 102 and a connecting plate 103. The motor 101 is fixed to the top of the side wall of the sludge storage tank 2. The driving rod 102 is fixed to the output end of the motor 101 and a first reciprocating spiral groove 18 is provided on the outer wall. The upper part of the connecting plate 103 is sleeved on the driving rod 102 and is provided with a guide shaft 1 matched with the first reciprocating spiral groove 18. 9. The lower part of the connecting plate 103 is connected to the guide rod 17. The motor 101 drives the connecting plate 103 to move back and forth and drives the base 6 to move back and forth through the cooperation between the connecting plate 103 and the guide rod 17. A plate groove 20 for the connecting plate 103 to slide is provided on the wall of the sludge tank. The plate groove 20 is connected to the guide groove 16. Two groups of driving components 10 can be provided and are symmetrically arranged on both sides of the sludge storage tank 2. The driving components 10 on both sides simultaneously drive the guide rods 17 on both sides of the base 6 to move, so that the base 6 is more stable during movement.

[0042] See also Figure 1-4 In order to prevent the substrate from being interfered by the lower filter cloth 3 during the rotation process, the guide groove 16 includes a first guide groove 161, a lifting chute 162 and a second guide groove 163 connected in sequence. The guide rod 17 slides in the first guide groove 161 to drive the base 6 to move and shovel the sludge to the shoveling area 8. The guide rod 17 can drive the base 6 to move up and down through the lifting chute 162. The first drive joint includes a first tooth area 111 arranged on the inner wall of the bottom of the second guide groove 163, and the guide rod 17 is provided with a first tooth area 111 meshing with the first tooth area 111. The guide rod 17 passes through the second guide groove 163 to make the first tooth portion 112 mesh with the first tooth area 111 and then drives the base 6 to rotate. The guide rod 17 slides up and down and is rotatably arranged on the connecting plate 103. The base 6 can change its horizontal and height positions by cooperating with the guide groove 16. After the base 6 is lifted by the cooperation of the guide rod 17 and the lifting chute 162, it can rotate by the cooperation of the first tooth portion 112 and the first tooth area 111, so as to avoid interference of the lower filter cloth 3 when the base block rotates.

[0043] See also Figure 1 , 4 In order to enable the connecting plate 103 that drives the guide rod 17 to maintain horizontal movement and to enable the guide rod 17 to be raised and lowered, as well as to be rotated, a rod groove 21 is provided at the bottom of the connecting plate 103, and a long rod 22 is provided in the rod groove 21 to slide up and down. A connecting block 23 is provided at the bottom of the long rod 22, and the guide rod 17 passes through the connecting block 23 and forms a rotational connection with the connecting block 23.

[0044] See also Figure 4 , 6In order to prevent the base 6 from rotating during the mud shoveling process, it also includes a locking assembly for limiting the rotation of the guide rod 17 on the connecting block 23. The locking assembly limits the rotation of the base 6 when shoveling the mud on the filter cloth 4. A locking hole 25 is provided on the outer wall of the guide rod 17. The locking assembly includes a locking rod 24. A locking rod groove 26 is provided in the long rod 22 for the locking rod 24 to slide up and down. The locking rod 24 is slidable up and down in the locking rod groove 26 and the bottom end is inserted into the locking hole 25 to limit the rotation of the guide rod 17.

[0045] See also Figure 1-4 6. In order to allow the base 6 to rotate after shoveling the sludge and passing through the lifting chute 162, it also includes an unlocking member for driving the lock rod 24 to disengage from the lock hole 25 when the base 6 needs to rotate. The lock rod 24 is a magnetic rod, and the unlocking member is a strong magnetic strip 27. The strong magnetic strip 27 is arranged on the inner wall of one side of the plate groove 20. The connecting plate 103 is provided with a socket 28 for inserting the strong magnetic strip 27. The top of the rod groove 21 is connected to the socket 28. When the guide rod 17 just enters the second guide groove 163 to make the first tooth portion 112 ready to mesh with the first tooth portion area 111, one end of the strong magnetic strip 27 is just inserted into the socket 28. The strong magnetic strip 27 is magnetically attracted to the long rod 22, driving the locking rod 24 to move up and out of the lock mouth (when the strong magnetic strip 27 is not magnetically attracted to the locking rod 24, there is a gap between the top of the locking rod 24 and the strong magnetic strip 27, so that the locking rod 24 can move up and out of the lock mouth). In addition, a resistance plate 29 is provided on the outer wall of the locking rod 24, and a disk groove for the resistance plate 29 to move up and down is provided in the locking rod groove 26, and a spring 30 is provided in the disk groove to resist the resistance plate 29. When the strong magnetic strip 27 is separated from the socket 28, the spring 30 resists the resistance plate 29 to drive the locking rod 24 to be quickly inserted into the lock mouth, thereby continuing to restrict the guide rod 17 from rotating in the connecting block 23.

[0046] See also Figure 2-5In order to rotate the filter cartridge 7 during the movement of the base 6, the second driving structure includes a second tooth area 121 arranged in the second guide groove 163, and the second tooth area 121 is located on the side of the plate groove 20 away from the first tooth area 111. The second driving structure also includes a rotating rod 123 rotatably arranged in the guide rod 17, and the outer wall of the rotating rod 123 is provided with a second tooth 122 engaged with the second tooth area 121. After the guide rod 17 moves in the second guide groove 163 to make the first tooth 112 and the first tooth area 111 engage, the second tooth 122 engages with the second tooth area 121, wherein the first tooth 112 and the second tooth area 121 engage. After the engagement with the first tooth area 111 is completed, the base 6 will rotate to a suitable angle position. The second guide groove 163 is located on one side of the first tooth area 111 and is provided with an anti-rotation strip 31 on its inner wall. The guide rod 17 is provided with a fitting area 32 on its outer wall. When the second tooth 122 is engaged with the second tooth area 121, the fitting area 32 is fitted with the anti-rotation strip 31 (the fitting area 32 is a plane, and the plane and the anti-rotation strip 31 will not rotate relative to each other after being fitted). The rotating rod 123 is provided with a driving member for driving the water filter cartridge 7 to rotate. When the driving member drives the water filter cartridge 7 to rotate, the fitting area 32 fits with the anti-rotation strip 31 to prevent the base 6 from rotating during the movement.

[0047] See also Figure 3-6 One end of the rotating rod 123 extends to the inside of the base 6, and a driving tooth portion 33 is provided on the circumferential outer wall of the water filter cartridge 7. The driving tooth portion 33 includes a bevel tooth portion 332 and a flat tooth portion 331. One end of the rotating rod 123 extending to the inside of the base 6 is provided with a bevel gear 34 meshing with the bevel tooth portion 332. A groove portion 35 for the bevel gear 34 to mesh with the bevel tooth portion 332 is provided on the side of the base 6. Adjacent water filter cartridges 7 are meshed through the flat tooth portion 331 (a through groove for the flat tooth portion 331 to mesh is provided between adjacent cartridge grooves 14). After the outermost water filter cartridge 7 rotates through the meshing of the bevel gear 34 with the bevel tooth portion 332, the other water filter cartridges 7 will also rotate accordingly.

[0048] See also Figure 4-7, a scraper 36 is axially slidably arranged in each group of water filter cartridges 7, and a conical surface 37 is provided at the opening of the scraper 36. When the base 6 is shoveling mud, the scraper 36 is located at the top of the water filter cartridge 7. After the base 6 completes the shoveling of mud and rotates, the sludge can enter the water filter cartridge 7 through the conical surface 37 of the scraper 36. The scraper 36 slides axially in the water filter cartridge 7 in the following manner: a positioning plate 38 is provided on the outer wall of the base 6 at each group of water filter cartridges 7, and a positioning groove 39 is provided at one end of the positioning plate 38. A U-shaped rod 40 is provided on the outer end surface of the scraper 36, and the end of the U-shaped rod 40 away from the scraper 36 is inserted into the positioning groove 39 and forms a sliding connection. A short shaft 41 is provided on the circumferential outer wall of the scraper 36, and a second reciprocating spiral groove 42 for the short shaft 41 to slide is provided on the circumferential inner wall of the water filter cartridge 7. When the water filter cartridge 7 rotates, a short shaft 4 The cooperation between the scraper 36 and the second reciprocating spiral groove 42 can make the scraper 36 move along the axial direction of the water filter cartridge 7, so as to scrape the sludge out of the water filter cartridge 7. Since the meshing between the adjacent water filter cartridges 7 through the flat tooth portion 331 will be reversed, the second reciprocating spiral grooves 42 in the adjacent water filter cartridges 7 are also arranged in the opposite direction. The scrapers 36 in the multiple groups of water filter cartridges 7 are all located in the same plane position. The scraper 36 is provided with a door opening member for driving the door plate 13 to open. The door opening member is a push rod 43 arranged on the end surface of the scraper 36 away from the U-shaped rod 40. When the sludge is centrifugally dehydrated in the water filter cartridge 7 for a period of time, the scraper 36 will move a distance toward the door plate 13 side through the cooperation between the short shaft 41 and the second reciprocating spiral groove 42. At this time, the push rod 43 contacts the door plate 13. The continued movement of the scraper 36 will cause the push rod 43 to push the door plate 13 open, so as to facilitate the sludge to flow out from the door plate 13.

[0049] See also Figure 1-7When the device is in use, the lower filter cloth 3 is conveyed (transmitted by a conveying roller, which is a prior art) to bring the water-containing sludge out of the sludge storage tank 2. When the lower filter cloth 3 drives the sludge to the rear filter cloth 302, the motor 101 is started, and the motor 101 drives the driving rod 102 to rotate. The driving rod 102 rotates to drive the connecting plate 103 to move in the opposite direction of the lower filter cloth 3 through the cooperation of the guide shaft 19 and the first reciprocating spiral groove 18, and drives the guide rod 17 to move through the long rod 22 (in the initial state, the guide rod 17 is located on the side of the first guide groove 161 close to the lifting chute 162). The movement of the guide rod 17 will drive the base 6 to move and shovel the sludge into the shoveling area 8, and the driving rod 102 continues to rotate. The first reciprocating spiral groove 18 is used to move the base 6 to the same side as the feeding direction of the lower filter cloth 3 after the mud is shoveled. The connecting plate 103 moves and drives the guide rod 17 to pass through the lifting chute 162 through the cooperation of the long rod 22. The guide rod 17 passes through the lifting chute 162 to make the long rod 22 move upward in the connecting plate 103. When the guide rod 17 is ready to move to the second guide groove 163, the strong magnetic strip 27 is just inserted into the socket 28 of the connecting plate 103. The locking rod 24 will move upward for a distance and disengage from the locking port under the magnetic attraction of the strong magnetic strip 27. At this time, the guide rod 17 continues to move in the second guide groove 163, which will make the first tooth portion 112 and the first tooth portion area 111 The guide rod 17 is meshed and driven to rotate in the connecting block 23, thereby driving the base 6 to rotate. When the base 6 rotates to a vertical state, the sludge will be poured into multiple groups of water filter cartridges 7. At the same time, the first tooth portion 112 is disengaged from the first tooth area 111 and the fitting area 32 is fitted with the anti-rotation strip 31, so that the guide rod 17 moves without rotating. At this time, the second tooth portion 122 of the rotating rod 123 is meshed with the second tooth area 121 and rotates. The rotation of the rotating rod 123 will mesh with the bevel gear 34 and the bevel tooth portion 332 to drive the water filter cartridge 7 to rotate. The adjacent water filter cartridges 7 are rotated through the meshing of the flat tooth portion 331, thereby centrifugally dehydrating the sludge and flowing out through the outlet trough 15. The sludge is then sucked out of the water filter 7 and then moved back and forth through the filter 4 to the sludge storage tank 2. When the filter cartridge 7 rotates, the cooperation between the short shaft 41 and the second reciprocating spiral groove 42 drives the scraper 36 to move axially in the filter cartridge 7, thereby scraping off the sludge on the inner wall of the filter cartridge 7. After the scraper 36 moves a certain distance, the push rod 43 pushes the door panel 13 to open, and the sludge flows out from the door panel 13 to the lower filter cloth 3, forming a plurality of evenly arranged sludge strips (gaps are provided between the plurality of sludge strips. When the upper filter cloth 4 and the lower filter cloth 3 are squeezed subsequently, the gaps provide a certain extension space between the plurality of sludge strips, so that the filter cloth can be filtered more evenly, thus avoiding uneven use of the filter cloth due to partial filtering of the filter cloth).

[0050] After the sludge in the water filter cartridge 7 is discharged onto the lower filter cloth 3, the connecting plate 103 will be ready to slide back and drive the base 6 to slide back. When sliding back, the second tooth portion 122 is engaged with the second tooth area 121 to drive the scraper 36 to return to the initial position, and then the first tooth portion 112 is engaged with the first tooth area 111 to drive the base 6 to rotate to a subsequent angle suitable for shoveling mud. When the guide rod 17 continues to slide back and is ready to pass through the lifting inclined guide groove 16, the strong magnetic strip 27 is separated from the socket 28. When the magnetic attraction of the strong magnetic strip 27 is lost, the locking rod 2 Under the action of the spring 30 and the abutment plate 29, the guide rod 17 will be quickly inserted into the lock (the guide rod 17 rotates clockwise and counterclockwise for the same number of circles, and at the same position, the lock will still be located opposite to the lock rod 24), and then the guide rod 17 will enter the lifting chute 162 and move into the first guide groove 161. At this time, the end of the base 6 located in the mud shoveling area 8 will be in a position against the lower filter cloth 3 again. In addition, due to the transmission of the lower filter cloth 3, the mud on the lower filter cloth 3 will be transported to the position where the base 6 shoveled mud last time, so that the base 6 continues to shovel mud again.

[0051] After being treated by the dehydration device, the dehydrated clear liquid is returned to the pretreatment device, and the dehydrated sludge cake is sent to the incinerator for incineration.

[0052] Embodiment 2

[0053] See also Figure 8 A method for resource utilization of landfill leachate reverse osmosis concentrate comprises the following steps:

[0054] Step 1: The leachate is first collected in a regulating tank, and the leachate in the regulating tank is sent to a pretreatment device through a lifting pump. The alkaline solution generated by the acid-base generating device and the primary anaerobic effluent are mixed with the leachate to react, and the pH of the mixed solution is adjusted to 9.7-10.0 to remove most of the total hardness in the leachate. After the reaction, the mixed solution is added with a flocculant and precipitated in a pretreatment sedimentation tank. The effluent of the pretreatment sedimentation tank is further removed of suspended matter and part of ammonia nitrogen by a cyclone flotation device, and the effluent of the cyclone flotation device is stored in a pretreatment water production tank;

[0055] Step 2: The pre-treated water enters the primary anaerobic tank for treatment to remove most of the COD and BOD5 in the leachate. The effluent of the primary anaerobic tank passes through the primary anaerobic degassing tank and the primary anaerobic sedimentation tank to remove the sludge suspended matter in the water. The sludge in the mud hopper of the primary anaerobic sedimentation tank flows back to the primary anaerobic tank. Part of the effluent of the primary anaerobic sedimentation tank flows back to the pretreatment device, and part enters the secondary anaerobic tank to further remove the COD in the leachate. The mixed liquid in the secondary anaerobic tank passes through the anaerobic MBR device for mud and water separation. The water produced by the anaerobic MBR device is sent to the deammoniation device, and the biogas produced by the primary anaerobic tank and the secondary anaerobic tank is sent to the incinerator for incineration treatment;

[0056] Step 3: The anaerobic MBR produced water enters the deammoniation device reaction tank, and the pH of the solution is adjusted to 10.5-11 to further remove the total hardness in the leachate. After the reaction, the mixed solution continues to add flocculants and then precipitates in the deammoniation device sedimentation tank. The effluent of the deammoniation device sedimentation tank is first added with alkaline solution in the pipeline mixer to adjust the pH to about 11.0, and then enters the deammoniation membrane assembly for treatment to remove most of the ammonia nitrogen in the leachate. The ammonia nitrogen is converted into ammonia gas and then absorbed by the acid solution. The acid solution after absorption is converted into ammonium salt solution and stored in the ammonium salt water tank. The effluent of the deammoniation membrane assembly is stored in the deammoniation device produced water tank;

[0057] Step 4: After the pH of the produced water from the deammoniation device is adjusted to about 8.5 using an acid solution in the produced water tank of the deammoniation device, it enters the A / O-MBR device for treatment, and undergoes nitrification and denitrification reactions in the nitrification tank and the denitrification tank to remove COD, BOD5, ammonia nitrogen and total nitrogen in the leachate. The sludge mixed liquid in the membrane pool is separated from the water by the MBR membrane module, and the produced water from the MBR membrane module enters the nanofiltration device;

[0058] Step 5, the produced water of the MBR membrane assembly enters the nanofiltration device for treatment, the concentrated water of the nanofiltration device enters the high-pressure reverse osmosis device for further concentration treatment, the produced water of the nanofiltration device enters the electrodialysis device for treatment, the fresh water of the electrodialysis device and the produced water of the high-pressure reverse osmosis device enter the water production pool together, part of the concentrated water of the electrodialysis device enters the acid-base generating device, and part enters the plant area for consumption, the acid-base generating device uses the electrodialysis concentrated water to generate acid solution and alkaline solution, the alkaline solution is reused in the pretreatment device and the deammoniation device, the acid solution is reused in the deammoniation device, and the fresh water of the acid-base generating device is refluxed to the electrodialysis device;

[0059] Step 6: The sludge discharged from the primary anaerobic device, the anaerobic MBR device and the A / O-MBR device enters the sludge dewatering device 1 for dewatering treatment, the clear liquid after dewatering flows back to the pretreatment device, and the dewatered sludge cake is sent to the incinerator for incineration treatment.

[0060] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0061] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0062] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for recycling landfill leachate reverse osmosis concentrate, comprising a regulating tank, a pretreatment device, a primary anaerobic device, a secondary anaerobic device, an anaerobic MBR device, a deammoniation device, an A / O-MBR device, a nanofiltration device, an electrodialysis device, a water production tank, a high-pressure reverse osmosis device, an acid-base generating device and a sludge dewatering device (1), which are connected in sequence. The device is characterized in that: The sludge dewatering device (1) comprises a sludge storage tank (2), wherein a lower filter cloth (3) and an upper filter cloth (4) are arranged in the sludge storage tank (2), wherein the lower filter cloth (3) transports the sludge that has undergone gravity dewatering and passes through the upper filter cloth (4) to squeeze and squeeze each other to obtain a sludge cake, wherein the sludge storage tank (2) is provided with a sludge auxiliary water filtering device (5) located above the lower filter cloth (3), and the sludge auxiliary water filtering device (5) is located in front of the upper filter cloth (4); The sludge-assisted water filtering device (5) comprises a base (6) and a water filter cartridge (7), wherein the base (6) is provided with a shoveling area (8), the water filter cartridge (7) is arranged at the rear side of the shoveling area (8), and a plurality of groups of water filter cartridges (7) are arranged along the length direction of the base (6), each group of water filter cartridges (7) is rotatably arranged on the base (6) and one open end of each group of water filter cartridges (7) faces the shoveling area (8), the shoveling area (8) is provided with a guide plate (9) between adjacent water filter cartridges (7), and a front plate (9) is provided on the sludge storage tank (2) for driving the base (6) to convey the sludge along the lower filter cloth (3) A driving assembly (10) reciprocates in the rear direction, and a first driving rotation structure for driving the base (6) to rotate and a second driving rotation structure for driving the water filter cartridge (7) to rotate are also provided on the sludge storage tank (2). The sludge is shoveled into the shovel area (8) by the moving base (6) and is guided into the water filter cartridge (7) after the base (6) rotates. The base (6) is provided with a door plate (13) at the bottom end of the water filter cartridge (7). The water filter cartridge (7) rotates to throw out water on the sludge so that the sludge is discharged from the door plate (13) to the surface of the lower filter cloth (3); Guide grooves (16) are provided on the side walls of the sludge storage tank (2), guide rods (17) are provided on the two sides of the base (6) and are slidably connected to the guide grooves (16), the drive assembly (10) comprises a motor (101), a drive rod (102) and a connecting plate (103), the motor (101) is fixed to the top of the side wall of the sludge storage tank (2), the drive rod (102) is fixed to the output end of the motor (101) and a first reciprocating spiral groove (18) is provided on the outer wall, and the connecting plate (103) is provided with a first reciprocating spiral groove (18) on the outer wall of the motor (101). 03) The upper part is sleeved on the driving rod (102) and is provided with a guide shaft (19) that cooperates with the first reciprocating spiral groove (18); the lower part of the connecting plate (103) is connected to the guide rod (17); the motor (101) drives the connecting plate (103) to move back and forth and drives the base (6) to move back and forth through the cooperation between the connecting plate (103) and the guide rod (17); the wall of the sludge pool is provided with a plate groove (20) for the connecting plate (103) to slide, and the plate groove (20) is connected to the guide groove (16); The guide groove (16) comprises a first guide groove (161), a lifting inclined groove (162) and a second guide groove (163) which are connected in sequence. The guide rod (17) slides in the first guide groove (161) to drive the base (6) to move and shovel the sludge to the shoveling area (8). The guide rod (17) passes through the lifting inclined groove (162) to drive the base (6) to move up and down. The first driving structure comprises a first tooth area (111) arranged on the inner wall of the bottom of the second guide groove (163). The guide rod (17) is provided with a first tooth area (112) meshing with the first tooth area (111). The guide rod (17) passes through the second guide groove (163) to mesh the first tooth area (112) with the first tooth area (111) and then drives the base (6) to rotate. The guide rod (17) slides up and down and is rotatably arranged on the connecting plate (103); The second driving structure includes a second tooth section (121) arranged in the second guide groove (163), the second tooth section (121) is located on a side of the plate groove (20) away from the first tooth section (111), and the second driving structure also includes a rotating rod (123) rotatably arranged in the guide rod (17), the outer wall of the rotating rod (123) is provided with a second tooth section (122) meshing with the second tooth section (121), and the guide rod (17) moves in the second guide groove (163) so that the first tooth section (112) is meshed with the first tooth section (111). After the first tooth area (111) is meshed, the second tooth portion (122) meshes with the second tooth area (121); an anti-rotation strip (31) is provided on the inner wall of the second guide groove (163) located on one side of the first tooth area (111); a fitting area (32) is provided on the outer wall of the guide rod (17); when the second tooth portion (122) meshes with the second tooth area (121), the fitting area (32) and the anti-rotation strip (31) are fitted; and a driving member for driving the water filter cartridge (7) to rotate is provided on the rotating rod (123).

2. The device for recycling landfill leachate reverse osmosis concentrated liquid according to claim 1, characterized in that: A rod groove (21) is provided at the bottom of the connecting plate (103), a long rod (22) is provided in the rod groove (21) for sliding up and down, a connecting block (23) is provided at the bottom of the long rod (22), and the guide rod (17) passes through the connecting block (23) and forms a rotational connection with the connecting block (23).

3. The device for recycling landfill leachate reverse osmosis concentrated liquid according to claim 2, characterized in that: It also includes a locking assembly for limiting the rotation of the guide rod (17) on the connecting block (23), the locking assembly limiting the rotation of the base (6) when shoveling sludge on the filter cloth (4), a locking hole (25) is provided on the outer wall of the guide rod (17), and the locking assembly includes a locking rod (24), the locking rod (24) is slidably arranged in the long rod (22) and the bottom end of the locking rod (24) is inserted into the locking hole (25) to limit the rotation of the guide rod (17).

4. The device for recycling landfill leachate reverse osmosis concentrated liquid according to claim 3, characterized in that: It also includes an unlocking member for driving the lock rod (24) to disengage from the lock hole (25) when the base (6) needs to be rotated, the lock rod (24) is a magnetic rod, the unlocking member is a strong magnetic strip (27), the strong magnetic strip (27) is arranged on the inner wall of one side of the plate groove (20), and the connecting plate (103) is provided with a socket (28) for inserting the strong magnetic strip (27), when the first tooth portion (112) on the guide rod (17) is ready to mesh with the first tooth portion area (111), one end of the strong magnetic strip (27) is just inserted into the socket (28) and is magnetically attracted to the long rod (22) to drive the lock rod (24) to move up and disengage from the lock.

5. The device for recycling landfill leachate reverse osmosis concentrated liquid according to claim 4, characterized in that: One end of the rotating rod (123) extends into the interior of the base (6); a driving tooth portion (33) is provided on the circumferential side of the circumferential outer wall of the water filter cartridge (7); the driving tooth portion (33) comprises a bevel tooth portion (332) and a flat tooth portion (331); one end of the rotating rod (123) extending into the interior of the base (6) is provided with a bevel gear (34) meshing with the bevel tooth portion (332); adjacent water filter cartridges (7) are meshed with each other via the flat tooth portion (331).

6. The device for recycling landfill leachate reverse osmosis concentrated liquid according to claim 5, characterized in that: A scraper (36) is axially slidably disposed inside each group of water filter cartridges (7), a conical surface (37) is provided at the opening of the scraper (36), and a door opening member for driving the door plate (13) to open is provided on the scraper (36).

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