A leachate treatment device for a waste incineration plant

Abstract

The present invention relates to the technical field of sewage treatment, and discloses a leachate treatment device for a waste incineration plant, including an adjustment tank and a homogenization tank. An isolation part is installed in the adjustment tank and the homogenization tank for isolating mixed garbage in the leachate. A first waste removal part is installed on the isolation part for intermittently cleaning floating garbage during the pretreatment process of the leachate. A pair of filter membranes is used to perform primary filtration on the leachate that first enters the adjustment tank, isolating the incompletely incinerated garbage between the two filter membranes. The leachate that enters the homogenization tank through the second sewage inlet pipe is subjected to secondary filtration through a filter membrane two. The particulate matter after secondary filtration will be blocked on the side of the two filter membranes two away from each other and will not flow into the sewage discharge pipe following the leachate, thereby effectively improving the quality of the leachate passing through the sewage discharge pipe and further improving the quality of the leachate pretreatment.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and particularly to a leachate treatment device for a waste incineration plant. Background Art

[0002] The leachate of urban landfill is a high-concentration organic wastewater with complex components. If it is directly discharged into the environment without treatment, it will cause serious environmental pollution. For the purpose of environmental protection, it is essential to treat the leachate.

[0003] According to Chinese Patent Publication No. CN109264933A, this patent provides a treatment device for waste incineration plant leachate, including an anaerobic reaction treatment system and a reverse osmosis treatment system connected in sequence. The waste incineration plant leachate passes through the anaerobic reaction treatment system and the two-stage DTRO reverse osmosis treatment system in this device in sequence to achieve the removal of organic matter and ammonia nitrogen. It also includes a pretreatment system, a chemical addition softening and flocculation precipitation treatment system, and an ion exchange treatment system, avoiding the use of processes and equipment with high energy consumption and operating costs, and at the same time eliminating the MBR process section, greatly reducing the construction cost, saving the project floor area. This device has a good operating environment and operation and maintenance, which is very important for extending the service life of the system and ensuring the stable operation of the system. Most operations can be automatically controlled and run; the project operates stably and the membrane module has a long service life.

[0004] Since domestic waste is incinerated centrally, there will be a situation where the waste piled up inside is difficult to be fully incinerated, resulting in some unburned waste being mixed in the leachate. Therefore, when performing biological reaction sewage treatment of the leachate, the unburned waste will float, which will increase the risk of clogging the filter screen in the pretreatment space, and then reduce the filtering efficiency of the filter screen, affecting the working efficiency of the leachate sewage treatment device. At the same time, the unburned waste will cause secondary pollution to the soil and groundwater sources along with the leachate. Therefore, a leachate treatment device for a waste incineration plant is proposed to solve the above-mentioned problems. Summary of the Invention

[0005] (1) Technical Problems to be Solved

[0006] In view of the deficiencies of the prior art, the present invention provides a leachate treatment device for a waste incineration plant, which solves the problem that the risk of clogging the filter screen in the pretreatment space is increased by unburned waste.

[0007] (2) Technical Solutions

[0008] To achieve the above object, the present invention provides the following technical solution: A leachate treatment device for a waste incineration plant, including an adjustment tank and a homogenization tank. An isolation part is installed in the adjustment tank and the homogenization tank for isolating the mixed garbage in the leachate. A first waste removal part is installed on the isolation part for intermittently cleaning floating garbage during the pretreatment process of the leachate. A second waste removal part is installed on the isolation part for synchronously and intermittently cleaning flocculent garbage during the pretreatment process of the leachate. A draining and feeding part is installed between the adjustment tank and the homogenization tank for draining floating garbage and flocculent garbage and intermittently circulating and transporting the garbage. A recycling and utilization part is installed between the adjustment tank and the homogenization tank for recovering the leached leachate for reprocessing.

[0009] Preferably, the isolation part includes two brackets which are respectively installed on the top edges of the tank openings of the adjustment tank and the homogenization tank. A support arm is fixedly connected between the two brackets. A dual-axis motor is installed on the support arm. Reciprocating lead screws are installed on both output shafts of the dual-axis motor. A first filter membrane is installed in the adjustment tank. The side frames of the two first filter membranes close to each other are fixedly connected with a first sliding frame. Two second filter membranes are installed in the homogenization tank. The side frames of the two second filter membranes close to each other and the side frames away from each other are fixedly connected with a second sliding frame.

[0010] Preferably, the first waste removal part includes a first slider which is threadedly connected to the reciprocating lead screw on one output shaft of the dual-axis motor. A first sliding plate is fixedly connected to the bottom of the first slider. First sliding rods are fixedly connected to both sides of the first sliding plate. The first sliding plate is slidably connected to the two first sliding frames through the first sliding rods. A first limiting arm is fixedly connected to the bottom of the first sliding plate. A first hinge and a first pushing plate are arranged in the middle of the side wall of each first limiting arm. Each first limiting arm is respectively hinged to the corresponding side line of the first pushing plate through the first hinge.

[0011] Preferably, the second waste removal part includes a second slider which is threadedly connected to the reciprocating lead screw on the other output shaft of the dual-axis motor. A second sliding plate is fixedly connected to the bottom of the second slider. Second sliding rods are fixedly connected to both sides of the second sliding plate and the second sliding plate is slidably connected between the two second sliding frames close to each other through the second sliding rods. Connecting arms are fixedly connected to both sides of the top of the second sliding plate. First sliding plates are fixedly connected to the ends of the two connecting arms away from each other. Third sliding rods are fixedly connected to both sides of each first sliding plate. The third sliding rods close to each other on the two first sliding plates are respectively slidably connected to the inner walls of the two second sliding frames away from each other. First limiting arms are fixedly connected to the bottoms of the second sliding plate and the two first sliding plates. A second hinge and a second pushing plate are arranged in the middle of the side wall of each first limiting arm. Each first limiting arm is respectively hinged to the corresponding side line of the second pushing plate through the second hinge.

[0012] Preferably, the draining and feeding part includes two support plates which are respectively installed on one side of the regulating tank and the homogenizing tank close to each other. A conveyor belt device is arranged between the regulating tank and the homogenizing tank. The conveyor belt device includes two conveyor belts. The two support plates are respectively attached to the inner walls of the two conveyor belts. A filter plate is fixedly connected to the top of the outer walls of the two conveyor belts. A connecting belt is fixedly connected between each pair of filter plates.

[0013] Preferably, the recycling part includes a recycling tank which is installed between the outer walls of the regulating tank and the homogenizing tank and is located below the conveyor belt device. Both sides of the inner wall of the recycling tank are fixedly penetrated by a recycling pipe. One end of each of the two recycling pipes far away from the recycling tank extends outside the recycling tank and is equipped with a recycling lift pump. The two recycling lift pumps are respectively installed on both sides of the outer wall of the homogenizing tank. The out-lets of the two recycling lift pumps are respectively fixedly penetrated to both sides of the inner wall of the homogenizing tank. Two flow-pushing agitators are symmetrically installed at the inner wall angles of the homogenizing tank.

[0014] Preferably, two second sewage inlet pipes are communicated between the regulating tank and the homogenizing tank. Guide plates are fixedly sleeved on the outer walls of the two second sewage inlet pipes. The two guide plates are both installed between the outer walls of the regulating tank and the homogenizing tank. The tops of the two guide plates are both inclined plane structures and are symmetrically arranged.

[0015] Preferably, a first sewage inlet pipe is communicated with the outer wall of the regulating tank far away from the second sewage inlet pipe, and a sewage discharge pipe is communicated with the side of the homogenizing tank far away from the second sewage inlet pipe.

[0016] Preferably, the pipe orifice of the first sewage inlet pipe is located between two first filter membranes. The pipe orifices of the two second sewage inlet pipes are located on the sides far away from each other of the two first filter membranes. The other pipe orifices of the two second sewage inlet pipes are located on the sides far away from each other of the two second filter membranes. The pipe orifice of the sewage discharge pipe is located between the two second filter membranes.

[0017] Preferably, one end of the sewage discharge pipe far away from the homogenizing tank is communicated with a biochemical system. An ultrafiltration membrane treatment system is communicated with the biochemical system. A clear liquid tank is communicated with the ultrafiltration membrane treatment system. A reverse osmosis nanofiltration system is communicated with the clear liquid tank.

[0018] (III) Beneficial effects

[0019] Compared with the prior art, the present invention provides a leachate treatment device for a waste incineration plant, which has the following beneficial effects:

[0020] 1. The leachate treatment equipment of this waste incineration plant uses a pair of filter membranes to conduct primary filtration on the leachate that initially enters the adjustment tank, isolating the incompletely incinerated waste between the two filter membranes one. The leachate that enters the homogenization tank through the second sewage inlet pipe is subjected to secondary filtration through filter membrane two. The particulate matter after secondary filtration will be blocked on the side of the two filter membranes two that are far away from each other and will not flow into the sewage discharge pipe following the leachate, thus effectively improving the quality of the leachate passing through the sewage discharge pipe and further enhancing the quality of the leachate pretreatment.

[0021] 2. The leachate treatment equipment of this waste incineration plant uses a double-axis motor to drive the movement of slider one by rotating the reciprocating screw rod. Due to the resistance of the leachate, it causes the slide plate one to flip on the hinge one. Similarly, the push plate two can also flip on the hinge two when the slide plate three and the slide plate two reciprocate, ensuring the thrust of the slide plate one and the slide plate two on the floating waste. When the slider one and the slider two reset, they are subjected to the resistance of the water flow and flip open again to present a rake-like state, ensuring that the residual waste flows back to the front side of the slide plate one and the slide plate two, avoiding the accumulation of residual waste on the rear side of the slide plate one and the slide plate two, which may cause the problem of floating waste accumulation and incomplete flat push next time.

[0022] 3. The leachate treatment equipment of this waste incineration plant uses a filter plate to receive the waste after flat pushing for sedimentation and water drainage. The leachate drained out falls into the internal reflux tank through the pores on the filter plate. The conveyor belt device intermittently works according to the preset command to convey the drained waste by the conveyor belt for recycling treatment. By intermittently presetting the operation of the reflux lift pump, the leachate in the reflux tank returns to the homogenization tank through the reflux pipe, avoiding the waste of leachate and the problem that the residual leachate cannot be treated synchronously.

[0023] 4. The leachate treatment equipment of this waste incineration plant uses an isolation part to isolate the incompletely burned waste in the leachate, achieving a preliminary effective separation of the leachate and the burned waste. Then, through the intermittent operation of the first waste removal part and the second waste removal part, the burned waste and the flocculent waste are continuously removed to improve the filtration quality of the leachate. The drained burned waste and flocculent waste are centrally transported and processed through the drained feeding part, reducing the humidity of the waste and avoiding the problem of secondary pollution to the soil and underground water sources. The reflux utilization part reduces resource waste, reclaims and re-filters the residual leachate, and further improves the pretreatment quality of the leachate. Description of the Drawings

[0024] Figure 1 It is the overall structure diagram of a leachate treatment equipment for a waste incineration plant proposed by the present invention;

[0025] Figure 2 It is the structure diagram of the adjustment tank and the homogenization tank of a leachate treatment equipment for a waste incineration plant proposed by the present invention;

[0026] Figure 3Structural diagram of the isolation part of a leachate treatment device for a waste incineration plant proposed by the present invention;

[0027] Figure 4 Structural diagram of the first waste removal part of a leachate treatment device for a waste incineration plant proposed by the present invention;

[0028] Figure 5 Structural diagram of the second waste removal part of a leachate treatment device for a waste incineration plant proposed by the present invention;

[0029] Figure 6 Structural diagram of the draining and feeding part of a leachate treatment device for a waste incineration plant proposed by the present invention;

[0030] Figure 7 Structural diagram of the recycling part of a leachate treatment device for a waste incineration plant proposed by the present invention.

[0031] In the figure: 1, regulating tank; 2, homogenizing tank; 3, isolation part; 31, support; 32, support arm; 33, double-shaft motor; 34, reciprocating lead screw; 35, filter membrane 1; 36, sliding frame 1; 37, filter membrane 2; 38, sliding frame 2; 4, first waste removal part; 41, slider 1; 42, sliding plate 1; 43, sliding rod 1; 44, limiting arm 1; 45, hinge 1; 46, pushing plate 1; 5, second waste removal part; 51, slider 2; 52, sliding plate 2; 53, sliding rod 2; 54, connecting arm; 55, sliding plate 3; 56, sliding rod 3; 57, limiting arm 2; 58, pushing plate 2; 6, draining and feeding part; 61, support plate; 62, conveyor belt device; 63, filter plate; 64, connecting belt; 7, recycling part; 71, recycling tank; 72, recycling pipe; 73, recycling lift pump; 74, flow-pushing stirrer; 8, second sewage inlet pipe; 9, guiding plate; 10, first sewage inlet pipe; 11, sewage discharge pipe; 12, biochemical system; 13, ultrafiltration membrane treatment system; 14, clear liquid tank; 15, reverse osmosis nanofiltration system. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0033] Please refer to Figure 1-7, the present invention provides a technical solution: a leachate treatment device for a waste incineration plant, including an adjustment tank 1 and a homogenization tank 2. An isolation part 3 is installed in the adjustment tank 1 and the homogenization tank 2 to isolate the mixed garbage in the leachate. A first waste removal part 4 is installed on the isolation part 3 to intermittently clean the floating garbage during the pretreatment process of the leachate. A second waste removal part 5 is installed on the isolation part 3 to synchronously and intermittently clean the flocculated garbage during the pretreatment process of the leachate. A draining and feeding part 6 is installed between the adjustment tank 1 and the homogenization tank 2 to drain the floating garbage and the flocculated garbage and intermittently and circularly transport the garbage. A recycling part 7 is installed between the adjustment tank 1 and the homogenization tank 2 to recover the leachate drained out for reprocessing.

[0034] In the present invention, in order to improve the pretreatment quality of the mixed garbage that is not completely incinerated in the leachate, the isolation part 3 of this case includes two brackets 31. The two brackets 31 are respectively installed on the top edges of the pool openings of the adjustment tank 1 and the homogenization tank 2. A support arm 32 is fixedly connected between the two brackets 31. A double-shaft motor 33 is installed on the support arm 32. Reciprocating lead screws 34 are installed on both output shafts of the double-shaft motor 33. A first filter membrane 35 is installed in the adjustment tank 1. The first filter membrane 35 performs primary filtration on the mixed garbage. Sliding frames 36 are fixedly connected to the side frames of the two first filter membranes 35 that are close to each other. Two second filter membranes 37 are installed in the homogenization tank 2. The second filter membranes 37 perform secondary filtration on the particulate garbage. Sliding frames 38 are fixedly connected to the side frames of the two second filter membranes 37 that are close to each other and the side frames that are far from each other. In order to improve the filtration quality of the mixed garbage, the first waste removal part 4 of this case includes a slider 41. The slider 41 is threadedly connected to the reciprocating lead screw 34 on one output shaft of the double-shaft motor 33. A first sliding plate 42 is fixedly connected to the bottom of the slider 41. First sliding rods 43 are fixedly connected to both sides of the first sliding plate 42. The first sliding plate 42 is slidably connected to the two sliding frames 36 through the first sliding rods 43. A limiting arm 44 is fixedly connected to the bottom of the first sliding plate 42. A hinge 45 and a pushing plate 46 are arranged in the middle of the side wall of each limiting arm 44. Each limiting arm 44 is hinged to the corresponding pushing plate 46 through the hinge 45 at the edge line. The form of edge line hinge can limit the flipping angle of the pushing plate 46, so that the pushing plate 46 flips within the range of 0 degrees - 90 degrees, and there will be no over-flipping situation, thereby ensuring the thrust on the mixed garbage.

[0035] In this embodiment, in order to further improve the removal quality of floating garbage, the second waste removal part 5 of this case includes a second slider 51, and the second slider 51 is threadedly connected to the reciprocating lead screw 34 on the output shaft on the other side of the double-shaft motor 33. A second slide plate 52 is fixedly connected to the bottom of the second slider 51. Both sides of the second slide plate 52 are fixedly connected with second slide rods 53 and are slidably connected between two adjacent second slide frames 38 through the second slide rods 53. Both sides of the top of the second slide plate 52 are fixedly connected with connecting arms 54. Third slide plates 55 are fixedly connected to the ends of the two connecting arms 54 away from each other. Third slide rods 56 are fixedly connected to both sides of each third slide plate 55. The third slide rods 56 on the two third slide plates 55 close to each other are respectively slidably connected to the inner walls of the two second slide frames 38 away from each other. Limiting arms 57 are fixedly connected to the bottoms of the second slide plate 52 and the two third slide plates 55. A second hinge and a second push plate 58 are arranged in the middle of the side wall of each limiting arm 57. Each limiting arm 57 is hinged to the side line of the corresponding second push plate 58 through the second hinge. The form of side line hinge can limit the flipping angle of the second push plate 58, so that the second push plate 58 can flip within the range of 0°-90°, and no over-flipping will occur, thereby ensuring the thrust on the flocculated garbage.

[0036] It should be noted that in order to ensure the timely treatment of the filtered garbage and the recycling of the residual leachate, the draining and feeding part 6 of this case includes two support plates 61. The two support plates 61 are respectively installed on the adjacent sides of the regulating tank 1 and the homogenizing tank 2. A conveyor belt device 62 is arranged between the regulating tank 1 and the homogenizing tank 2. The conveyor belt device 62 includes two conveyor belts. The two support plates 61 are respectively attached to the inner walls of the two conveyor belts. Filter plates 63 are fixedly connected to the tops of the outer walls of the two conveyor belts. Connecting belts 64 are fixedly connected between each filter plate 63. The reflux utilization part 7 includes a reflux tank 71. The reflux tank 71 is installed between the outer walls of the regulating tank 1 and the homogenizing tank 2 and is located below the conveyor belt device 62. Reflux pipes 72 are fixedly penetrated through both sides of the inner wall of the reflux tank 71. One ends of the two reflux pipes 72 away from the reflux tank 71 extend outside the reflux tank 71 and are installed with reflux lift pumps 73. The two reflux lift pumps 73 are respectively installed on both sides of the outer wall of the homogenizing tank 2. The out-lets of the two reflux lift pumps 73 are respectively fixedly penetrated through both sides of the inner wall of the homogenizing tank 2. The reflux lift pumps 73 are used to pump the leachate remaining in the reflux tank 71 to improve the thoroughness of the pre-treatment of the leachate and avoid the problems of leachate waste and re-pollution. Two flow-pushing agitators 74 are symmetrically installed at the inner wall angles of the homogenizing tank 2. Two second sewage inlet pipes 8 are communicated between the regulating tank 1 and the homogenizing tank 2. Guide plates 9 are fixedly sleeved on the outer walls of the two second sewage inlet pipes 8. The two guide plates 9 are both installed between the outer walls of the regulating tank 1 and the homogenizing tank 2. The tops of the two guide plates 9 are both inclined plane structures and are symmetrically arranged.

[0037] It should be noted that in order to ensure the quality of the sewage treatment process, a first sewage inlet pipe 10 is connected to the outer wall of one side of the regulating tank 1 away from the second sewage inlet pipe 8 in this case. A sewage discharge pipe 11 is connected to one side of the homogenization tank 2 away from the second sewage inlet pipe 8. The pipe orifice of the first sewage inlet pipe 10 is located between two first filter membranes 35. The pipe orifices of the two second sewage inlet pipes 8 are located on the sides where the two first filter membranes 35 are away from each other. The other pipe orifices of the two second sewage inlet pipes 8 are located on the sides where the two second filter membranes 37 are away from each other. The pipe orifice of the sewage discharge pipe 11 is located between the two second filter membranes 37. One end of the sewage discharge pipe 11 away from the homogenization tank 2 is connected to a biochemical system 12. An ultrafiltration membrane treatment system 13 is connected and arranged on the biochemical system 12. A clear liquid tank 14 is connected and arranged on the ultrafiltration membrane treatment system 13. A reverse osmosis nanofiltration system 15 is connected and arranged on the clear liquid tank 14.

[0038] Working principle: The incinerated landfill leachate is collected into the regulating tank 1 through the first sewage inlet pipe 10. The regulating tank 1 can play a role in buffering the water volume and preliminarily pre-treating the water quality. The leachate in the regulating tank 1 is collected into the homogenization tank 2 through the two second sewage inlet pipes 8. In the homogenization tank 2, the way of mixing and blending the aged leachate and the fresh leachate by the two-side push-flow stirrers 74 can improve the biodegradability of the raw water, and a flocculant is put into the homogenization tank 2 to make small particle garbage flocculate and float on the surface of the leachate. The leachate entering the regulating tank 1 for the first time is subjected to primary filtration by the first filter membranes 35, and the incompletely incinerated garbage is isolated between the two first filter membranes 35. The garbage particles will suspend on the surface of the leachate and be blocked between the two first filter membranes 35. Since the leachate flows towards the second sewage inlet pipe 8, the liquid flow force will gradually drive the floating garbage to approach the side of the inner wall of the regulating tank 1 away from the first waste removal part 4. At the same time, the flowing liquid will push the first push plate 46 to open through the first hinge 45, so that the first push plate 46 is limited on the corresponding first limiting arm 44. The first sliding plate 42 and the first limiting arm 44 will present a rake-like state. This state can prevent the garbage from floating up and blocking between the first push plate 46 and the inner wall of the regulating tank 1, causing incomplete cleaning problems.

[0039] By intermittently presetting to start the double-shaft motor 33, the reciprocating screw rod 34 can be rotated to drive the first slider 41 to move, and at the same time, the first sliding plate 42 is promoted to slide on the first sliding frame 36. At this time, the first sliding plate 42 actively approaches the other side of the inner wall of the regulating tank 1, and the first hinge 45 is flipped and reset by the resistance of the leachate, so as to horizontally push the garbage floating and accumulating on the surface of the leachate, so that the garbage falls from the pool mouth of the regulating tank 1 to the filter plate 63. Since the first slider 41 on the reciprocating screw rod 34 has the ability of reciprocating motion, it will reset to the initial position after horizontally pushing the garbage. During the reset process, it is also affected by the water flow resistance to re-open the first sliding plate 42, and then restore the rake state to ensure that the residual garbage flows back to the front side of the first sliding plate 42 again, avoiding the accumulation of residual garbage on the rear side of the first sliding plate 42.

[0040] Similarly, the second push plate 58 can also be turned on and off through the second hinge when the third sliding plate 55 and the second sliding plate 52 reciprocate, so as to synchronously drive the second slider 51 to reciprocate through the reciprocating lead screw 34 on the other side of the double-shaft motor 33, realizing the flat push of the flocculated floating garbage, promoting the flocculated garbage to fall on the filter plate 63, and the connecting arm 54 synchronously drives the third sliding plate 55 to reciprocate, promoting the garbage on the surface of the leachate on the side where the two second filter membranes 37 are far away from each other to be smoothly pushed flat to the guide plate 9, and sliding down to the filter plate 63 through the inclined surface of the guide plate 9.

[0041] The leachate entering the equalization tank 2 through the second sewage inlet pipe 8 is secondarily filtered through the second filter membrane 37. The particulate matter after the secondary filtration will be blocked on the side where the two second filter membranes 37 are far away from each other and will not flow into the sewage discharge pipe 11 along with the leachate, thereby effectively improving the quality of the leachate passing through the sewage discharge pipe 11 and further improving the quality of the leachate pretreatment.

[0042] The garbage is concentrated on the filter plate 63 for precipitation and water drainage. The drained leachate falls into the internal part of the return tank 71 through the pores on the filter plate 63. Through the intermittent preset operation of the conveyor belt device 62, the drained garbage is conveyed by the curved movement of the conveyor belt to move and be recycled. After the drained garbage is conveyed, the filter plate 63 moves back to between the adjustment tank 1 and the equalization tank 2 through the curved movement for the next garbage pick-up. The connecting belt 64 ensures the curvature between each filter plate 63 and avoids the problem that the filter plate 63 gets stuck at the turning point of the conveyor belt.

[0043] The leachate accumulated in the return tank 71 works through the intermittent preset return lift pump 73, and thus returns to the equalization tank 2 again through the return pipe 72, avoiding the waste of leachate and the problem that the residual leachate cannot be treated synchronously.

[0044] The leachate pretreated by the adjustment tank 1 and the equalization tank 2 enters the biochemical system 12 through the sewage discharge pipe 11. The biochemical system 12, the ultrafiltration membrane treatment system 13, the clear liquid tank 14 and the reverse osmosis nanofiltration system 15 all belong to the existing sewage treatment process steps. The biochemical system 12 uses a two-stage nitrification and denitrification system for biological nitrogen removal, reducing the organic matter and ammonia nitrogen in the leachate. After the biochemical reaction, the leachate enters the ultrafiltration membrane treatment system 13 through the ultrafiltration feed pump. Ultrafiltration uses an ultrafiltration membrane to ultrafilter the clear liquid into the clear liquid tank 14 for buffer storage, and the sludge returns to the first-stage denitrification tank of the biochemical system 12 for re-reaction. After the pH value of the ultrafiltrate in the clear liquid tank 14 is adjusted to an appropriate value through the buffer tank and acid addition, it is transported to the reverse osmosis nanofiltration system 15 through the ultrafiltrate pump for in-depth treatment, thereby separating out clear water and concentrated liquid, and then continuing to achieve the safe discharge of the leachate through the existing sewage process, which will not be elaborated in this case.

[0045] The plug-flow agitator 74 in this case can adopt the submersible mixer products under the name of Jiangsu Shuangyue Environmental Protection Equipment Co., Ltd., and the double-shaft motor 33 can adopt the YZ series motors under the name of Shenyang Koebeid Motor Group Co., Ltd. The lift pumps involved in this case are all common equipment for sewage treatment. The conveyor belt device 62 uses a well-known technology conveyor belt for conveying work. The above product equipment belongs to the prior art, so no more details will be given.

[0046] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent in such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or device including the said element.

Claims

1. A leachate treatment equipment for a waste incineration plant, characterized in that: include: Regulating tank (1); Homogenizing tank (2); An isolation part (3) is installed in the regulating tank (1) and the homogenizing tank (2) and is used to isolate mixed garbage in the leachate; A first waste removal section (4) is installed on the isolation section (3) and is used for intermittently cleaning floating garbage during the leachate pretreatment process; A second waste removal section (5) is installed on the isolation section (3) and is used for synchronously and intermittently cleaning flocculated waste during the leachate pretreatment process; A draining and feeding section (6) is installed between the regulating tank (1) and the homogenizing tank (2) and is used to drain floating garbage and flocculated garbage and to intermittently circulate the garbage; A reflux utilization unit (7) installed between the regulating tank (1) and the homogenizing tank (2) and used for recovering the leached leachate for reprocessing; The isolation part (3) comprises two brackets (31), the two brackets (31) are respectively mounted on the top edges of the pool openings of the regulating pool (1) and the homogenizing pool (2), a support arm (32) is fixedly connected between the two brackets (31), a double-axis motor (33) is mounted on the support arm (32), and reciprocating screw rods (34) are mounted on the two output shafts of the double-axis motor (33), a filter membrane 1 (35) is mounted in the regulating pool (1), and a sliding frame 1 (36) is fixedly connected to the frame edges of the two filter membranes 1 (35) on one side close to each other, and two filter membranes 2 (37) are mounted in the homogenizing pool (2), and a sliding frame 2 (38) is fixedly connected to the frame edges of the two filter membranes 2 (37) on one side close to each other and on one side far away from each other; The first waste removal part (4) includes a slider (41), the slider (41) is threadedly connected to a reciprocating screw (34) on an output shaft on one side of a dual-axis motor (33), a slide plate (42) is fixedly connected to the bottom of the slider (41), both sides of the slide plate (42) are fixedly connected to slide rods (43), the slide plate (42) is slidably connected to two slide frames (36) through the slide rods (43), the bottom of the slide plate (42) is fixedly connected to a limit arm (44), a hinge (45) and a push plate (46) are provided in the middle of the side wall of each limit arm (44), and each limit arm (44) is hinged to the corresponding push plate (46) through the hinge (45).

2. A waste incineration plant leachate treatment equipment according to claim 1, characterized in that: The second waste removal part (5) comprises a second slider (51), the second slider (51) being threadedly connected to a reciprocating screw (34) on the output shaft on the other side of the dual-axis motor (33), a second slide plate (52) being fixedly connected to the bottom of the second slider (51), both sides of the second slide plate (52) being fixedly connected to second slide bars (53) and being slidably connected between two slide frames (38) close to each other through the second slide bars (53), and connecting arms (54) being fixedly connected to the top of the second slide plate (52), and both ends of the two connecting arms (54) being fixedly connected to each other. A slide plate three (55) is connected, and both sides of each slide plate three (55) are fixedly connected with a slide rod three (56), and the slide rods three (56) on the two slide plates three (55) that are close to each other are respectively slidably connected to the inner walls of two slide frames two (38) that are far away from each other. The bottoms of the slide plate two (52) and the two slide plates three (55) are fixedly connected with a limit arm two (57), and a hinge two and a push plate two (58) are arranged in the middle of the side wall of each limit arm two (57), and each limit arm two (57) is hinged to the corresponding push plate two (58) edge line through the hinge two.

3. The waste incineration plant leachate treatment equipment according to claim 1, characterized in that: The draining and feeding part (6) comprises two support plates (61), the two support plates (61) being respectively mounted on the side of the regulating tank (1) and the homogenizing tank (2) close to each other, a conveyor belt device (62) being arranged between the regulating tank (1) and the homogenizing tank (2), the conveyor belt device (62) comprising two conveyor belts, the two support plates (61) being respectively fitted with the inner walls of the two conveyor belts, the outer walls of the two conveyor belts being fixedly connected with filter plates (63) at the top, and connecting belts (64) being fixedly connected between each of the filter plates (63).

4. The waste incineration plant leachate treatment equipment according to claim 1, characterized in that: The reflux utilization part (7) comprises a reflux pool (71), the reflux pool (71) being installed between the outer walls of the regulating pool (1) and the homogenizing pool (2) and being located below the conveyor belt device (62), both sides of the inner wall of the reflux pool (71) being fixedly penetrated by reflux pipes (72), the ends of the two reflux pipes (72) away from the reflux pool (71) both extending to the outside of the reflux pool (71) and being installed with reflux lifting pumps (73), the two reflux lifting pumps (73) being respectively installed on both sides of the outer wall of the homogenizing pool (2), the outlet ports of the two reflux lifting pumps (73) being respectively fixedly penetrated by both sides of the inner wall of the homogenizing pool (2), and two plug flow agitators (74) being symmetrically installed on the inner wall of the homogenizing pool (2) at an included angle.

5. The waste incineration plant leachate treatment equipment according to claim 4, characterized in that: Two second sewage inlet pipes (8) are connected between the regulating tank (1) and the homogenizing tank (2), and the outer walls of the two second sewage inlet pipes (8) are fixedly sleeved with guide plates (9). The two guide plates (9) are installed between the outer walls of the regulating tank (1) and the homogenizing tank (2), and the tops of the two guide plates (9) are inclined structures and are symmetrically arranged with each other.

6. The waste incineration plant leachate treatment equipment according to claim 5, characterized in that: The outer wall of the regulating tank (1) at a side away from the second sewage inlet pipe (8) is connected to the first sewage inlet pipe (10), and the outer wall of the homogenizing tank (2) at a side away from the second sewage inlet pipe (8) is connected to the sewage discharge pipe (11).

7. The waste incineration plant leachate treatment equipment according to claim 6, characterized in that: The pipe opening of the first sewage inlet pipe (10) is located between the two filter membranes (35), the pipe openings of the two second sewage inlet pipes (8) are located on the side of the two filter membranes (35) away from each other, the other pipe openings of the two second sewage inlet pipes (8) are located on the side of the two filter membranes (37) away from each other, and the pipe opening of the sewage discharge pipe (11) is located between the two filter membranes (37).

8. The waste incineration plant leachate treatment equipment according to claim 7, characterized in that: One end of the sewage pipe (11) away from the homogenization tank (2) is connected to a biochemical system (12), an ultrafiltration membrane treatment system (13) is connected to the biochemical system (12), a clear liquid tank (14) is connected to the ultrafiltration membrane treatment system (13), and a reverse osmosis nanofiltration system (15) is connected to the clear liquid tank (14).

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