Fly ash landfill leachate treatment device

Abstract

The utility model relates to the technical field of leachate treatment, and discloses a fly ash landfill leachate treatment device which comprises a precipitation treatment bin, and the outer wall of the precipitation treatment bin is fixedly sleeved with a reinforcing support. The closed deodorization mechanism is arranged on the precipitation treatment bin, and the closed deodorization mechanism is used for reducing the amount of odor emitted during operation of the precipitation treatment bin; and the automatic dosing mechanism is arranged on the side wall of the precipitation treatment bin. According to the utility model, through the design of the cover plate, the top of the precipitation treatment bin can be sealed, so that the problem that odor of percolate is easily diffused from the top of the precipitation treatment bin due to the fact that the precipitation treatment bin is of an open structure is solved; an air suction pump works to extract air in the precipitation treatment bin and directly introduce the air into an inner cavity of the adsorption purification bin, and odor can be adsorbed and purified through activated carbon in the inner cavity of the adsorption purification bin, so that the peculiar smell of exhausted gas is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of leachate treatment, and specifically, to a leachate treatment device for a fly ash landfill. Background Art

[0002] Fly ash landfill leachate is wastewater formed by the dissolution of soluble substances in waste incineration fly ash during the landfill process due to rainwater infiltration or insufficient anti-seepage. It mainly contains high-concentration heavy metals and salts, has a high pH value, strong alkalinity, and low organic matter content, has biological toxicity and long-term leaching risk, and needs to reduce the heavy metal toxicity through chemical reduction, adsorption and other pretreatment methods, and combine resource utilization technologies to achieve safe disposal. The fly ash landfill leachate treatment process uses the synergistic effect of "pretreatment + biological treatment + advanced treatment". First, electrocatalytic oxidation and fly ash adsorption are used to remove heavy metals and organic matter, then anaerobic (UASB) and two-stage A / O processes are used to degrade organic matter and denitrify, and finally MBR combined with nanofiltration and reverse osmosis (DTRO / RO) are used for advanced desalination and pollutant interception. The concentrated liquid is recycled or evaporated and crystallized to ensure that the effluent meets the discharge requirements of the "Pollution Control Standard for Domestic Waste Landfills".

[0003] Fly ash landfill leachate needs to be subjected to precipitation treatment in the pretreatment stage. Fly ash leachate contains high-concentration heavy metals and toxic substances such as arsenic and selenium. Precipitation treatment can form hydroxide or sulfide precipitates of heavy metal ions through chemical reactions, reducing their solubility and biological toxicity. During the precipitation treatment process of leachate, sedimentation tanks are used. Traditional sedimentation tanks are all of open structures, and the odor concentration of fly ash landfill leachate is higher than that of traditional sewage, which makes a large amount of odor fill the sewage treatment working environment, seriously polluting the air environment and affecting the physical and mental health of nearby workers. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a leachate treatment device for a fly ash landfill, so as to solve the problem that a large amount of odor is emitted during the operation of an open sedimentation tank in the prior art, thereby seriously polluting the nearby air environment.

[0005] The utility model provides the following technical solution: A leachate treatment device for a fly ash landfill, comprising:

[0006] A precipitation treatment chamber, on the outer wall of which a reinforcement bracket is fixedly sleeved;

[0007] A closed deodorization mechanism, which is arranged on the precipitation treatment chamber and is used to reduce the amount of odor emitted during the operation of the precipitation treatment chamber;

[0008] Automatic chemical dosing mechanism, the automatic chemical dosing mechanism is arranged on the side wall of the sedimentation treatment tank, and the automatic chemical dosing mechanism is used for uniformly adding sedimentation agents during the process of extracting leachate;

[0009] The closed deodorization mechanism includes a closed deodorization component and an adsorption deodorization component. The closed deodorization component includes an air suction pump and a cover plate. The air suction pump is fixedly installed on the side wall of the sedimentation treatment tank away from the automatic chemical dosing mechanism. The cover plate is detachably connected to the top of the sedimentation treatment tank. A lifting lug is welded on the top of the cover plate. The input end of the air suction pump is fixedly communicated with an air extraction pipeline. The end of the air extraction pipeline away from the air suction pump is threadedly communicated with the top of the cover plate. The output end of the air suction pump is fixedly communicated with an exhaust pipeline.

[0010] As a preference of the above technical solution, the adsorption deodorization component includes an adsorption purification tank. The adsorption purification tank is fixedly installed on the side wall of the sedimentation treatment tank away from the automatic chemical dosing mechanism. The top of the adsorption purification tank is movably inserted with a top cover. The end of the exhaust pipeline away from the air suction pump is fixedly communicated with the top of the top cover. A plurality of flow guiding plates are fixedly installed on the inner wall of the adsorption purification tank.

[0011] As a preference of the above technical solution, the bottom of the adsorption purification tank is fixedly installed with a bottom plate. A wire mesh frame is fixedly installed on the inner wall of the bottom plate. An internal thread part is fixedly installed on the inner wall of the wire mesh frame. A threaded cover is threadedly connected to the bottom of the internal thread part. Activated carbon is filled in the inner cavity of the adsorption purification tank.

[0012] As a preference of the above technical solution, the automatic chemical dosing mechanism includes a bent pipe. The bent pipe is fixedly connected to the side wall of the sedimentation treatment tank. A horizontal pipeline is fixedly communicated with the side wall of the bent pipe. A leachate extraction pipe orifice is fixedly communicated with the top of the horizontal pipeline.

[0013] As a preference of the above technical solution, a column is fixedly installed on the top of the bent pipe. A valve is fixedly connected to the top of the horizontal pipeline. A liquid storage cylinder is fixedly connected to the top of the valve. The liquid storage cylinder is fixedly installed on the side wall of the column.

[0014] As a preference of the above technical solution, a limiting rod is fixedly installed at the bottom of the inner wall of the bent pipe. A sliding closure member is slidably connected to the outer wall of the limiting rod. An elastic member is fixedly installed on the top of the sliding closure member. The top of the elastic member is fixedly connected to the top of the inner wall of the bent pipe.

[0015] As a preference of the above technical solution, a first rubber sheet and a second rubber sheet are respectively fixedly connected to the corresponding positions of the top of the sliding closure member and the leachate extraction pipe orifice and the valve. The tops of the first rubber sheet and the second rubber sheet are both abutted against the top of the inner wall of the bent pipe.

[0016] Compared with the prior art, the beneficial effects of the present utility model are:

[0017] Through the design of the cover plate, the top of the sedimentation treatment bin can be sealed, avoiding the problem that the sedimentation treatment bin has an open structure and the odor of leachate is likely to diffuse out in large quantities from the top of the sedimentation treatment bin. When the leachate is extracted, the suction pump works to extract the air inside the sedimentation treatment bin and directly introduce it into the inner cavity of the adsorption and purification bin. The activated carbon in the inner cavity of the adsorption and purification bin can adsorb and purify the odor, reducing the odor of the discharged gas. With this design, the overflow of odor during the sedimentation treatment of leachate can be greatly reduced, the quality of the nearby air environment can be improved, the physical and mental health of the nearby staff can be guaranteed, and the environmental protection of the device can be enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a perspective view of the present utility model;

[0019] Figure 2 is a schematic sectional view of the adsorption and purification bin of the present utility model;

[0020] Figure 3 is a schematic sectional view of the horizontal pipe of the present utility model;

[0021] Figure 4 is a schematic view of the structure of the sliding closure member of the present utility model;

[0022] Figure 5 is a schematic view of the bottom structure of the sedimentation treatment bin of the present utility model.

[0023] In the figure: 1. Sedimentation treatment bin; 11. Reinforcement bracket; 2. Sealing and deodorizing mechanism; 21. Suction pump; 22. Cover plate; 23. Exhaust pipe; 24. Exhaust pipe; 25. Adsorption and purification bin; 251. Top cover; 252. Deflector; 253. Bottom plate; 254. Mesh frame; 255. Internal thread member; 256. Threaded cap; 3. Automatic dosing mechanism; 31. Bent pipe; 32. Horizontal pipe; 33. Leachate extraction nozzle; 34. Valve; 35. Liquid storage cylinder; 36. Column; 37. Limit rod; 371. Sliding closure member; 372. First rubber sheet; 373. Second rubber sheet; 374. Elastic member. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.

[0025] As Figures 1 - 5 shown, the present utility model provides a technical solution: a leachate treatment device for a fly ash landfill, comprising:

[0026] A sedimentation treatment bin 1, on the outer wall of which a reinforcement bracket 11 is fixedly sleeved;

[0027] The closed deodorization mechanism 2 is arranged on the sedimentation treatment tank 1, and the closed deodorization mechanism 2 is used to reduce the odor emitted during the operation of the sedimentation treatment tank 1;

[0028] The automatic chemical dosing mechanism 3 is arranged on the side wall of the sedimentation treatment tank 1, and the automatic chemical dosing mechanism 3 is used to uniformly add sedimentation agents during the process of extracting leachate;

[0029] The closed deodorization mechanism 2 includes a closed deodorization component and an adsorption deodorization component. The closed deodorization component includes an air suction pump 21 and a cover plate 22. The air suction pump 21 is fixedly installed on the side wall of the sedimentation treatment tank 1 away from the automatic chemical dosing mechanism 3. The cover plate 22 is detachably connected to the top of the sedimentation treatment tank 1. A lifting lug is welded on the top of the cover plate 22. The input end of the air suction pump 21 is fixedly communicated with an air extraction pipeline 23. The end of the air extraction pipeline 23 away from the air suction pump 21 is threadedly communicated with the top of the cover plate 22. The output end of the air suction pump 21 is fixedly communicated with an exhaust pipeline 24. Through the design of the reinforcement bracket 11, the sedimentation treatment tank 1 can be reinforced from the outside. The bottom of the sedimentation treatment tank 1 is fixedly connected with a discharge gate valve. By opening the discharge gate valve, the treated sewage can be discharged. The function of the bottom discharge gate valve is to discharge the sediment formed after chemical dosing. The water outlet is in the upper part of the side wall of the sedimentation treatment tank, and a water outlet valve is installed. Open the water outlet valve for drainage. The cover plate 22 can seal the top of the sedimentation treatment tank 1, avoiding the problem that the leachate odor is likely to diffuse out from the top of the sedimentation treatment tank 1 due to the open structure of the sedimentation treatment tank 1. The cover plate 22 is installed on the top of the sedimentation treatment tank 1 by bolts. If it is necessary to clean the inner cavity of the sedimentation treatment tank 1, the cover plate 22 can be disassembled. Through the design of the lifting lug, it is convenient to lift the cover plate 22 by an external lifting device. Through the cooperation of the air suction pump 21 and the air extraction pipeline 23, the gas in the inner cavity of the sedimentation treatment tank 1 can be extracted, so that a negative pressure is generated in the inner cavity of the sedimentation treatment tank 1, and then the leachate can be extracted into the inner cavity of the sedimentation treatment tank 1 by means of this negative pressure.

[0030] As an implementation mode in this embodiment, such as Figure 2As shown in the figure, the adsorption deodorization component includes an adsorption purification chamber 25, which is fixedly installed on the side wall of the precipitation treatment chamber 1 away from the automatic dosing mechanism 3. The top of the adsorption purification chamber 25 is movably inserted with a top cover 251. One end of the exhaust pipe 24 away from the suction pump 21 is fixedly communicated with the top of the top cover 251. A plurality of flow guiding plates 252 are fixedly installed on the inner wall of the adsorption purification chamber 25. Through the design of the exhaust pipe 24, the air output by the suction pump 21 can be introduced into the inner cavity of the adsorption purification chamber 25 through the top cover 251. The activated carbon in the inner cavity of the adsorption purification chamber 25 can adsorb and purify the odor, reducing the odor of the discharged gas. During maintenance, the top cover 251 is pulled out from the top of the adsorption purification chamber 25, and then the activated carbon can be added into the inner cavity of the adsorption purification chamber 25. Through the design of the flow guiding plates 252, the air flowing inside the adsorption purification chamber 25 can be guided, increasing the contact time between the air and the activated carbon and improving the deodorization efficiency.

[0031] As an implementation manner in this embodiment, as Figure 2 shown, a bottom plate 253 is fixedly installed at the bottom of the adsorption purification chamber 25. A wire frame 254 is fixedly installed on the inner wall of the bottom plate 253. An internal thread member 255 is fixedly installed on the inner wall of the wire frame 254. A threaded cover 256 is threadedly connected to the bottom of the internal thread member 255. The inner cavity of the adsorption purification chamber 25 is filled with activated carbon. The wire frame 254 is used to block the activated carbon in the inner cavity of the adsorption purification chamber 25 and at the same time facilitate the discharge of air. During maintenance, the threaded cover 256 is screwed out from the bottom of the internal thread member 255, and then the activated carbon inside the adsorption purification chamber 25 can be discharged.

[0032] As an implementation manner in this embodiment, as Figure 3 shown, the automatic dosing mechanism 3 includes a folding pipe 31, which is fixedly connected to the side wall of the precipitation treatment chamber 1. A horizontal pipe 32 is fixedly communicated with the side wall of the folding pipe 31. A leachate extraction nozzle 33 is fixedly communicated with the top of the horizontal pipe 32. Through the design of the folding pipe 31 and the horizontal pipe 32, the inner cavity of the leachate extraction nozzle 33 is communicated with the inner cavity of the precipitation treatment chamber 1. The end of the leachate extraction nozzle 33 is connected to an extraction pipe in advance, and the end of the extraction pipe is immersed in the leachate. Then, the suction pump 21 is controlled to work, so that a negative pressure is generated in the inner cavity of the precipitation treatment chamber 1, and then the leachate can be extracted into the inner cavity of the precipitation treatment chamber 1 by means of this negative pressure.

[0033] As an implementation manner in this embodiment, as Figure 3As shown in the figure, a vertical column 36 is fixedly installed at the top of the folded pipe 31. A valve 34 is fixedly connected to the top of the horizontal pipe 32. The top of the valve 34 is fixedly connected to a liquid storage cylinder 35. The liquid storage cylinder 35 is fixedly installed on the side wall of the vertical column 36. The inner cavity of the liquid storage cylinder 35 is used to store the precipitation agent, and the precipitation agent is an aqueous solution of polyacrylamide. The aqueous solution of polyacrylamide enhances the floc structure through a bridging effect, improves the precipitation efficiency. When the valve 34 is controlled to open and the leachate is pumped into the inner cavity of the precipitation treatment chamber 1, the precipitation agent inside the liquid storage cylinder 35 will enter the leachate flowing in the horizontal pipe 32, realizing the function of automatically mixing the precipitation agent, without the need for subsequent stirring treatment of the leachate and the precipitation agent, and improving the effect of water treatment.

[0034] As an implementation method in this embodiment, as Figure 3 、 Figure 4 shown, a limiting rod 37 is fixedly installed at the bottom of the inner wall of the folded pipe 31. A sliding closure 371 is slidably connected to the outer wall of the limiting rod 37. An elastic member 374 is fixedly installed at the top of the sliding closure 371. The top of the elastic member 374 is fixedly connected to the top of the inner wall of the folded pipe 31. In the initial state, due to the elastic force of the elastic member 374, the sliding closure 371 is pulled to slide to the top along the outer wall of the limiting rod 37. The whole sliding closure 371 closes the leachate extraction pipe orifice 33 at the top of the inner wall of the folded pipe 31 and the corresponding hole of the valve 34. When the air suction pump 21 works, a negative pressure is generated in the inner cavity of the precipitation treatment chamber 1, and this negative pressure will pull down the sliding closure 371, releasing the closure of the hole, thus facilitating the input of the leachate and the precipitation agent.

[0035] As an implementation method in this embodiment, as Figure 4 shown, a first rubber sheet 372 and a second rubber sheet 373 are respectively fixedly connected to the corresponding positions of the top of the sliding closure 371 and the leachate extraction pipe orifice 33 and the valve 34. The tops of the first rubber sheet 372 and the second rubber sheet 373 are both in contact with the top of the inner wall of the folded pipe 31. Through the design of the first rubber sheet 372 and the second rubber sheet 373, the closing effect of the top of the sliding closure 371 on the hole at the top of the inner wall of the folded pipe 31 is improved.

[0036] When in use, the inner cavity of the liquid storage cylinder 35 is filled with precipitation agent in advance, and then the valve 34 is opened, the end of the leachate extraction pipe port 33 is connected to the leachate extraction pipe in advance, and then the end of the extraction pipe is immersed in the leachate, and then the suction pump 21 is controlled to work, so that negative pressure is generated in the inner cavity of the precipitation treatment chamber 1, and the negative pressure will pull down the sliding closure 371, release the sealing of the top hole of the folded tube 31 by the sliding closure 371, thereby facilitating the input of leachate and precipitation agent, and at the same time, the negative pressure will The filtrate is extracted into the inner cavity of the sedimentation treatment bin 1. After the precipitation agent is manually calculated and added to a certain amount, the valve 34 can be closed. The air output by the suction pump 21 will pass through the top cover 251 and be introduced into the inner cavity of the adsorption purification bin 25. The activated carbon in the inner cavity of the adsorption purification bin 25 can adsorb and purify the odor and reduce the odor of the exhaust gas. After the leachate inside the sedimentation treatment bin 1 is treated, the discharge gate valve is opened to discharge the treated leachate. The user should also collect the leachate for subsequent treatment.

[0037] The above embodiments are only used to illustrate the technical solution of the present invention, but not to limit it.

Claims

1. An apparatus for treating leachate from a fly ash landfill, characterized in that, Comprising: A precipitation treatment bin (1), on the outer wall of which a reinforcement bracket (11) is fixedly sleeved; A closed deodorization mechanism (2), which is arranged on the precipitation treatment bin (1), and the closed deodorization mechanism (2) is used to reduce the odor emitted during the operation of the precipitation treatment bin (1); An automatic dosing mechanism (3), which is arranged on the side wall of the precipitation treatment bin (1), and the automatic dosing mechanism (3) is used to uniformly add precipitation agents during the process of extracting leachate; The closed deodorization mechanism (2) includes a closed deodorization component and an adsorption deodorization component. The closed deodorization component includes an air suction pump (21) and a cover plate (22). The air suction pump (21) is fixedly installed on the side wall of the precipitation treatment bin (1) away from the automatic dosing mechanism (3). The cover plate (22) is detachably connected to the top of the precipitation treatment bin (1). A lifting lug is welded on the top of the cover plate (22). The input end of the air suction pump (21) is fixedly communicated with an air extraction pipeline (23). One end of the air extraction pipeline (23) away from the air suction pump (21) is threadedly communicated with the top of the cover plate (22). The output end of the air suction pump (21) is fixedly communicated with an exhaust pipeline (24).

2. The leachate treatment device for fly ash landfill according to claim 1, characterized in that: The adsorption deodorization component includes an adsorption purification bin (25), which is fixedly installed on the side wall of the precipitation treatment bin (1) away from the automatic dosing mechanism (3). The top of the adsorption purification bin (25) is movably inserted with a top cover (251). One end of the exhaust pipeline (24) away from the air suction pump (21) is fixedly communicated with the top of the top cover (251). A plurality of guide plates (252) are fixedly installed on the inner wall of the adsorption purification bin (25).

3. The leachate treatment device for fly ash landfill according to claim 2, characterized in that: The bottom of the adsorption purification bin (25) is fixedly installed with a bottom plate (253). A wire mesh frame (254) is fixedly installed on the inner wall of the bottom plate (253). An internal thread part (255) is fixedly installed on the inner wall of the wire mesh frame (254). A threaded cover (256) is threadedly connected to the bottom of the internal thread part (255). The inner cavity of the adsorption purification bin (25) is filled with activated carbon.

4. A leachate treatment device for a fly ash landfill according to claim 1, characterized in that: The automatic dosing mechanism (3) includes a bent pipe (31), which is fixedly connected to the side wall of the precipitation treatment bin (1). A horizontal pipeline (32) is fixedly communicated with the side wall of the bent pipe (31). A leachate extraction pipe orifice (33) is fixedly communicated with the top of the horizontal pipeline (32).

5. The leachate treatment device for fly ash landfill according to claim 4, characterized in that: A column (36) is fixedly installed on the top of the bent pipe (31). A valve (34) is fixedly connected to the top of the horizontal pipeline (32). A liquid storage cylinder (35) is fixedly connected to the top of the valve (34). The liquid storage cylinder (35) is fixedly installed on the side wall of the column (36).

6. The leachate treatment device for fly ash landfill according to claim 5, wherein: A limiting rod (37) is fixedly installed at the bottom of the inner wall of the bent pipe (31). A sliding closure member (371) is slidably connected to the outer wall of the limiting rod (37). An elastic member (374) is fixedly installed on the top of the sliding closure member (371). The top of the elastic member (374) is fixedly connected to the top of the inner wall of the bent pipe (31).

7. The leachate treatment device for fly ash landfill according to claim 6, characterized in that: At the corresponding positions of the top of the sliding closure member (371) and the leachate extraction pipe orifice (33) and the valve (34), a first rubber sheet (372) and a second rubber sheet (373) are respectively fixedly connected. The tops of the first rubber sheet (372) and the second rubber sheet (373) are both in contact with the top of the inner wall of the folded pipe (31).

Images