A device for treating leachate from hazardous waste landfill

Abstract

The invention discloses a treatment device for leachate from a hazardous waste landfill, belonging to the technical field of leachate treatment equipment, comprising a sedimentation box, a transition box and a treatment box, wherein a plurality of cleaning mechanisms are arranged in the treatment box, the cleaning mechanisms comprising a sleeve and a plug, an internally hollow moving rod is movably connected in the sleeve, three multi-nozzle nozzles and a plurality of nozzles tilted upward are arranged around the moving rod at equal intervals, a counterweight block and a guide pipe are arranged on the top of the moving rod, a traction hose and a hopper are arranged on the upper end of the guide pipe, and through the invention, in the process of treating the leachate, particles suspended in the water and particles settled on the bottom of the water can be carried to the surface of the leachate, the waste liquid containing a large amount of particles can be concentratedly discharged separately, and the particles can be filtered out without adding flocculants, thereby saving the time for the flocculants to form flocs and the cost of the flocculants themselves and cleaning, and improving the filtering efficiency of the suspended particles.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of leachate treatment equipment, in particular to a treatment device for leachate in hazardous waste landfills. Background Art

[0002] A hazardous waste landfill is a facility designed specifically for the safe disposal of hazardous waste. Due to their potential hazards, these wastes need to be treated and disposed of in a special environment to prevent harm to the environment and human health. In the process of treating these wastes, a certain amount of wastewater will be generated. This wastewater is filtered through the garbage layer of the landfill to obtain leachate. This liquid usually contains various components dissolved or suspended from the waste. Therefore, the composition of the leachate is complex and varied, depending on the type of waste and the environmental conditions.

[0003] There are a certain amount of organic particles in these leachates. These particles are mainly suspended in the water, with a small amount floating on the water surface or settling at the bottom of the water in an irregular distribution. At present, the main method of adding flocculants is to remove the particles in the water. The flocculants aggregate with the particles in the water to form larger flocs, and the density increases. After the density of these flocs is greater than that of water, they gradually settle to the bottom of the water to form sludge. After standing and stratification, the water above can be discharged, and then these floc sediments can be cleaned up together. However, it generally takes a long time to form stable flocs, and the formation and sedimentation of flocs are difficult to control, which sometimes causes the flocs to break and redisperse into the water. In addition to the cost of the flocculant itself, the subsequent cleaning costs and resources are also increased. In subsequent membrane filtration systems, the use of flocculants may increase the risk of membrane contamination and shorten the service life of the membrane (including microfiltration, ultrafiltration, nanofiltration and reverse osmosis, these membrane technologies can effectively remove heavy metal ions in water), and sometimes flocculants will produce by-products with heavy metals and chemicals, which will increase the cost of cleaning. Summary of the invention

[0004] The technical solution of the present invention aims at the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technologies. Specifically, the present invention mainly provides a treatment device for leachate from hazardous waste landfills, which is used to solve the technical problem raised in the above background technology that, when removing suspended particles in leachate, it is generally adopted to add flocculants, but the addition of flocculants makes it difficult to control the formation and sedimentation of flocs, which sometimes causes the flocs to break and redisperse into the water, increasing the difficulty of subsequent cleaning.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] A device for treating leachate from a hazardous waste landfill comprises a sedimentation box, a transition box and a treatment box, wherein the sedimentation box, the transition box and the treatment box are stacked up and down, a plurality of connecting pipes are arranged on one side of the lower surface of the transition box, the lower end of each connecting pipe is connected to an interface on the upper surface of the sedimentation box, a plurality of cleaning mechanisms are arranged in a lattice, the cleaning mechanisms comprise a sleeve and a plug at the bottom of the sleeve, the sleeve is mounted at the bottom of the inner cavity of the treatment box by screws, an internal hollow moving rod is movably connected in the sleeve, three multi-nozzle nozzles and a plurality of nozzles inclined upwardly located above the multi-nozzle nozzles are evenly spaced around the moving rod, a counterweight block and a guide pipe are arranged on the top of the moving rod, the lower end of the guide pipe passes through the plug and is inserted into the transition box, a traction hose is arranged on the upper end of the guide pipe, a hopper is arranged on the upper end of the traction hose, and a plurality of notches are evenly spaced around the hopper.

[0007] Preferably, an annular floating block is provided on the lower side of each hopper.

[0008] Preferably, a first air inlet is provided at the bottom of the outer wall of the sleeve.

[0009] Preferably, a second air inlet is provided between the multi-nozzle nozzle on the moving rod and the nozzle located at the bottom.

[0010] Preferably, an annular isolation plate is provided on the inner wall protrusion of the moving rod, and the annular isolation plate is located between the second air inlet and the multi-nozzle nozzle.

[0011] Preferably, an angular baffle is provided on the upper side of each of the multi-nozzle nozzles, and one side of the angular baffle is connected to the outer wall of the moving rod.

[0012] Preferably, two insertion ports are provided on the upper side of the transition box, and a filter assembly is provided in each of the insertion ports. The filter assembly includes an outer frame, and two parallel filter screens are connected to the outer frame by screws. A plurality of porous activated carbon tubes are provided between the two parallel filter screens, and a biological rope is provided in each of the porous activated carbon tubes.

[0013] Preferably, a water inlet is provided on the upper side of the outer wall of the treatment box, a plurality of air pipe interfaces are evenly spaced on the side wall of the treatment box, and a U-shaped tube and a butterfly valve on the U-shaped tube are provided at the interface at the bottom of the treatment box, and the lower end of the U-shaped tube is connected to the sedimentation box.

[0014] Preferably, a water outlet pipe is provided on one side of the outer wall of the sedimentation tank, and a stop valve is provided on the water outlet pipe.

[0015] Compared with the prior art, the invention has the following beneficial effects: leachate

[0016] (1) The present invention realizes that during the process of treating the leachate, aeration is performed in the leachate by means of the treatment box, sleeve, plug, moving rod, multi-nozzle nozzle, nozzle, counterweight, guide pipe, traction hose, hopper, annular floating block and annular isolation plate. A large number of bubbles are formed. These bubbles encounter suspended particles during the rising process. The surface tension of the water surface prevents the bubbles from bursting. Since the suspended particles are small and have low density, the bubbles can carry the suspended particles to the water surface. Moreover, since the jet angle of the multi-nozzle nozzle is toward the bottom of the water, the bottom water flow is stirred. This stirring helps to re-suspend the suspended particles deposited on the bottom. , increasing their chances of contact with bubbles, thereby achieving the purpose of carrying all the particles on the bottom of the water and in the water to the surface of the leachate, which is conducive to the centralized export of these waste liquids containing a large amount of particles separately, without the need to add flocculants, which is more environmentally friendly, saving the time for flocculants to form flocs and the cost of flocculants themselves and cleaning, and improving the filtration efficiency of suspended particles. There is no need to worry about the formation and sedimentation of flocs being difficult to control, which sometimes causes the flocs to break and be redispersed in the water. The air source of the existing aeration equipment in water treatment can be used to separate the waste liquid, without the need to add additional driving equipment, reducing processing costs and energy consumption.

[0017] (2) The present invention realizes changing the aeration position of the nozzle by the strength of the air pressure by providing the first air inlet, the movable rod, the angular baffle, the multi-nozzle nozzle, the counterweight, the guide tube and the traction hose, that is, the aeration point can be continuously changed, so that the bubbles can immediately contact the suspended particles at different levels after being generated, so as to achieve the purpose of nearby aeration, increase the chance of particles being captured by the bubbles, and reduce the energy loss during the rising process of the bubbles. So that the bubbles can be more effectively used to carry and float the suspended particles, reduce the escape of bubbles, and further improve the efficiency of separating the particles in the leachate.

[0018] (3) The present invention achieves filtration of waste liquid discharged from the hopper, traction hose and diversion pipe by setting up an outer frame, filter screen, porous activated carbon tube and biological rope. The organic particulate matter in the waste liquid is adsorbed and filtered by the cooperation between the filter screen and the porous activated carbon tube, effectively removing organic pollutants in the leachate, and at the same time adsorbing odor molecules and malodorous substances in the water to reduce odor. The microorganisms in the biological rope can biodegrade organic particulate matter and further filter a large amount of particulate matter in the waste water. Since the two filter components are arranged in parallel and the connecting pipe is located on the same side of the filter components, one of the filter components can be replaced at any time. There is no need to stop the equipment for replacement, which does not affect the work progress and improves the work efficiency. The leachate is treated in turn by the treatment box, transition box and sedimentation box, so as to achieve a more comprehensive cleaning of the particles in the leachate. Through this method, flocculants are not used to preferentially treat organic particles, which will reduce the complexation of organic matter with heavy metal ions, and avoid the traditional formation of by-products between flocculants and some heavy metals after adding flocculants, thereby increasing the amount of particles and increasing the difficulty of cleaning. In the subsequent heavy metal removal process, there will be no risk of increased membrane pollution due to flocculants, so that the subsequent membrane filtration system cleaning effect is better.

[0019] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the overall structure decomposition of the present invention;

[0022] Figure 3 It is an exploded schematic diagram of the cleaning mechanism of the present invention;

[0023] Figure 4 It is a schematic diagram of the internal cross section of the sleeve and the moving rod of the present invention;

[0024] Figure 5 It is a schematic diagram of the decomposition of the filter assembly of the present invention.

[0025] In the figure: 1. sedimentation box; 11. outlet pipe; 12. stop valve; 13. U-shaped pipe; 14. butterfly valve; 2. transition box; 21. insertion port; 22. connecting pipe; 3. treatment box; 31. air pipe interface; 32. water injection port; 4. cleaning mechanism; 41. sleeve; 411. first air inlet; 42. plug; 43. moving rod; 431. angular baffle; 432. multi-mouth nozzle; 433. nozzle; 434. second air inlet; 44. counterweight; 45. guide pipe; 46. traction hose; 47. hopper; 471. notch; 48. annular floating block; 49. annular isolation plate; 5. filter assembly; 51. outer frame; 52. filter screen; 53. porous activated carbon tube; 54. biological rope. DETAILED DESCRIPTION

[0026] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0027] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly connected by technicians in the technical field to which the present invention belongs. The terminology used in the specification of the present invention is for the purpose of describing specific embodiments and is not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] Example 1, please refer to the attached Figure 1-Figure 5A treatment device for leachate from a hazardous waste landfill comprises a sedimentation tank 1, a transition tank 2 and a treatment tank 3, wherein the sedimentation tank 1, the transition tank 2 and the treatment tank 3 are stacked up and down, a plurality of connecting pipes 22 are arranged on one side of the lower surface of the transition tank 2, and the lower end of each connecting pipe 22 is connected to an interface on the upper surface of the sedimentation tank 1, a plurality of cleaning mechanisms 4 are arranged in a lattice, the cleaning mechanism 4 comprises a sleeve 41 and a plug 42 at the bottom of the sleeve 41, the sleeve 41 is installed at the bottom of the inner cavity of the treatment tank 3 by screws, and the sleeve 41 is movably connected with an internal central An empty moving rod 43, on which three multi-nozzle nozzles 432 and a plurality of nozzles 433 inclined upward are evenly spaced, a counterweight 44 and a guide pipe 45 are arranged on the top of the moving rod 43, the lower end of the guide pipe 45 passes through the plug 42 and is inserted into the transition box 2, the guide pipe 45 is long enough, and the lower end of the guide pipe 45 will not separate from the transition box 2 during the rising process, the upper end of the guide pipe 45 is provided with a traction hose 46, the upper end of the traction hose 46 is provided with a hopper 47, and the hopper 47 is evenly spaced and surrounded by a plurality of notches 471.

[0030] Through the above structure, it is achieved that in the process of treating the leachate, the particles suspended in the water and the particles settled on the bottom of the water can be carried to the surface of the leachate, and the waste liquid containing a large amount of particles can be separately discharged and the particles can be filtered out without adding flocculants, thereby saving the time for the flocculants to form flocculent precipitation and the cost of the flocculants themselves and cleaning, improving the filtration efficiency of suspended particles, and can utilize the air source of the existing aeration equipment in water treatment, without the need to add additional driving equipment, reducing processing costs and energy consumption, and the filter screen 52 can be replaced at any time without affecting the work progress.

[0031] The specific operation is as follows. First, the leachate is injected into the treatment box 3 through the water injection port 32. Then, the gas is injected into the first air inlet 411 and the second air inlet 434 by using the existing aeration equipment in water treatment (existing equipment, not shown in the figure). The gas taken in from the first air inlet 411 will first enter the inside of the moving rod 43. Due to the action of the annular isolation plate 49 between the inside of the moving rod 43 and the guide pipe 45, the gas is ejected from the multi-nozzle nozzle 432. Since the multi-nozzle nozzle 432 is facing the bottom of the water, it will push the moving rod 43 to move upward as a whole, and the height of the nozzle 433 on the moving rod 43 will also change accordingly. When the air pressure at the first air inlet 411 drops, due to the influence of the gravity of the moving rod 43 and the counterweight block 44, the moving rod 43 drops, thereby achieving the purpose of variable height of the aeration point of the nozzle 433. The gas taken in from the second air inlet 434 will be ejected from the moving rod 4 3 and the gap between the guide pipe 45 enters the nozzle 433 for aeration, and the bubbles generated bring the suspended particles in the water to the water surface. When the moving rod 43 descends, the guide pipe 45 will be driven to descend at the same time, and then the guide pipe 45 will pull the hopper 47 to sink through the traction hose 46, so that the notch 471 on the hopper 47 is just below the water surface. Therefore, the wastewater containing a large amount of particulate matter on the water surface enters the nearby hopper 47, and then enters the transition box 2 through the traction hose 46 and the guide pipe 45, and then passes through the two filter components 5, and then enters the sedimentation tank 1 through the connecting pipe 22. After the wastewater containing a large amount of particulate matter on the water surface is discharged, the butterfly valve 14 is opened, and the leachate containing a small amount of particulate matter (the particle value is within a reasonable specification) can be directly introduced into the sedimentation tank 1 through the U-shaped pipe 13 for precipitation. After standing for a period of time, the stop valve 12 is opened to introduce the leachate into the next link.

[0032] Example 2, please refer to the attached Figure 2 and Figure 5The upper side of the transition box 2 is provided with two insertion ports 21, each of which is provided with a filter assembly 5, the filter assembly 5 comprises an outer frame 51, the outer frame 51 is connected with two parallel filter screens 52 by screws, a plurality of porous activated carbon tubes 53 are provided between the two parallel filter screens 52, and each of the porous activated carbon tubes 53 is provided with a biological rope 54, through the filter assembly 5, the wastewater separated from the leachate is filtered and treated separately, the treatment box 3 A water injection port 32 is provided on the upper side of the outer wall, a plurality of air pipe interfaces 31 are provided at equal intervals on the side wall of the treatment box 3, and a U-shaped tube 13 and a butterfly valve 14 on the U-shaped tube 13 are provided at the interface at the bottom of the treatment box 3, the lower end of the U-shaped tube 13 is connected to the sedimentation box 1, and the on-off control of the U-shaped tube 13 is achieved through the butterfly valve 14, a water outlet pipe 11 is provided on one side of the outer wall of the sedimentation box 1, and a stop valve 12 is provided on the water outlet pipe 11, and the on-off control of the water outlet pipe 11 is achieved through the stop valve 12.

[0033] Example 3, please refer to the attached Figure 3 and Figure 4 , each of the hoppers 47 is provided with an annular floating block 48 at the lower side, and the hopper 47 is floated above the water surface through the annular floating block 48, and a first air inlet 411 is provided at the bottom position of the outer wall of the sleeve 41, and an air source that can change the height of the moving rod 43 is introduced through the first air inlet 411, and a second air inlet 434 is provided between the multi-mouth nozzle 432 on the moving rod 43 and the nozzle 433 at the bottom, and an air source for aeration of the nozzle 433 is introduced through the second air inlet 434, and an annular isolation block is provided on the inner wall convex block of the moving rod 43 Plate 49, the annular isolation plate 49 is located between the second air inlet 434 and the multi-nozzle nozzle 432. The annular isolation plate 49 is used to avoid cross-talk between the gases entering from the first air inlet 411 and the second air inlet 434, which is beneficial to control the air pressure to achieve the control of the aeration point height and the control of the aeration intensity. An angular baffle 431 is provided on the upper side of each of the multi-nozzle nozzles 432, and one side of the angular baffle 431 is connected to the outer wall of the moving rod 43. The angular baffle 431 is used to protect the multi-nozzle nozzle 432 and reduce the water resistance when the multi-nozzle nozzle 432 rises.

[0034] The above is an exemplary description of the present invention in combination with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A device for treating leachate from a hazardous waste landfill, comprising a sedimentation tank (1), a transition tank (2) and a treatment tank (3), wherein the sedimentation tank (1), the transition tank (2) and the treatment tank (3) are stacked up and down, a plurality of connecting pipes (22) are provided on one side of the lower surface of the transition tank (2), and the lower end of each of the connecting pipes (22) is connected to an interface on the upper surface of the sedimentation tank (1), characterized in that: A plurality of cleaning mechanisms (4) are arranged in a dot matrix in the processing box (3). The cleaning mechanisms (4) include a sleeve (41) and a plug (42) at the bottom of the sleeve (41). The sleeve (41) is mounted on the bottom of the inner cavity of the processing box (3) by means of screws. An internally hollow moving rod (43) is movably connected in the sleeve (41). Three multi-nozzle nozzles (432) and a plurality of nozzles (433) tilted upwards and located above the multi-nozzle nozzles (432) are arranged at equal intervals around the moving rod (43). A counterweight (44) and a guide tube (45) are arranged at the top of the moving rod (43). The lower end of the guide tube (45) passes through the plug (42) and is inserted into the transition box (2). A traction hose (46) is arranged at the upper end of the guide tube (45). A hopper (47) is arranged at the upper end of the traction hose (46). A plurality of notches (471) are arranged at equal intervals around the hopper (47). A first air inlet (411) is provided at the bottom of the outer wall of the sleeve (41), a second air inlet (434) is provided between the multi-nozzle nozzle (432) on the moving rod (43) and the nozzle (433) located at the bottom, and an annular isolation plate (49) is provided on the inner wall protrusion of the moving rod (43), and the annular isolation plate (49) is located between the second air inlet (434) and the multi-nozzle nozzle (432); Gas is injected into the first air inlet (411) and the second air inlet (434). The gas injected into the first air inlet (411) first enters the interior of the moving rod (43). Due to the effect of the annular isolation plate (49) between the interior of the moving rod (43) and the guide tube (45), the gas is ejected from the multi-nozzle nozzle (432). Since the multi-nozzle nozzle (432) is directed toward the bottom of the water, it pushes the moving rod (43) to move upward as a whole, and the height of the nozzle (433) on the moving rod (43) also changes accordingly. When the air pressure of the first air inlet (411) decreases, the moving rod (43) is moved downward due to the influence of the gravity of the moving rod (43) and the counterweight (44), thereby achieving the spraying effect. The purpose of the variable height of the aeration point of the head (433) is that the gas entering from the second air inlet (434) will enter the nozzle (433) through the gap between the moving rod (43) and the guide pipe (45) for aeration, and the generated bubbles will bring the suspended particles in the water to the water surface. When the moving rod (43) descends, it will also drive the guide pipe (45) to descend, and then the guide pipe (45) will pull the hopper (47) down through the traction hose (46), so that the notch (471) on the hopper (47) is just below the water surface. Therefore, the wastewater containing a large amount of particulate matter on the water surface enters the nearby hopper (47), and then enters the transition box (2) through the traction hose (46) and the guide pipe (45).

2. The device for treating leachate from a hazardous waste landfill according to claim 1, characterized in that: An annular floating block (48) is provided on the lower side of each hopper (47).

3. The device for treating leachate from a hazardous waste landfill according to claim 1, characterized in that: An angular baffle (431) is provided on the upper side of each of the multi-nozzle nozzles (432), and one side of the angular baffle (431) is connected to the outer wall of the moving rod (43).

4. The device for treating leachate from a hazardous waste landfill according to claim 1, characterized in that: Two insertion ports (21) are arranged on the upper side of the transition box (2), and a filter assembly (5) is arranged in each of the insertion ports (21). The filter assembly (5) comprises an outer frame (51), and two parallel filter screens (52) are connected to the outer frame (51) by screws. A plurality of porous activated carbon tubes (53) are arranged between the two parallel filter screens (52), and a biological rope (54) is arranged in each of the porous activated carbon tubes (53).

5. The device for treating leachate from a hazardous waste landfill according to claim 1, characterized in that: A water injection port (32) is provided on the upper side of the outer wall of the treatment box (3), a plurality of air pipe interfaces (31) are provided at equal intervals on the side wall of the treatment box (3), and a U-shaped tube (13) and a butterfly valve (14) on the U-shaped tube (13) are provided at the interface at the bottom of the treatment box (3), and the lower end of the U-shaped tube (13) is connected to the sedimentation box (1).

6. The device for treating leachate from a hazardous waste landfill according to claim 5, characterized in that: A water outlet pipe (11) is provided on one side of the outer wall of the sedimentation tank (1), and a stop valve (12) is provided on the water outlet pipe (11).

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