An apparatus and method for harmless treatment of leachate from a fly ash landfill

Abstract

The present invention relates to the technical field of waste liquid treatment, and specifically discloses a harmless treatment device and method for leaching solution in a fly ash landfill. It includes a bracket, and a plurality of membrane housings are provided on the bracket, and a plurality of filtering units are installed in the membrane housings; the filtering unit includes a housing, the housing is installed in the adjacent membrane housing, a rotating ring is rotatably arranged on the housing, a flow chamber is formed by the rotating ring and the housing, elastic strips are arranged on the inner side surface of the rotating ring, an inclined plate is fixedly connected to the outer side surface of the rotating ring, a first baffle and a second baffle are respectively arranged at both ends of the housing, a plurality of filter membranes are installed between the first baffle and the second baffle, and a first conduit is arranged between the first baffle and the second baffle. The invention ensures that impurities are relatively evenly attached to all the filter membranes by the periodic sweeping contact of the rotating ring with the filter membranes, enables all the filter membranes to work under the same pressure, and improves the working efficiency of the device.

Description

Technical Field

[0001] The invention relates to the technical field of waste liquid treatment, and in particular to a device and method for harmless treatment of leachate from a fly ash landfill. Background Art

[0002] In the harmless treatment process of leachate from fly ash landfills, reverse osmosis membrane (RO membrane) filtration devices play a vital role. This device is mainly used to effectively remove harmful substances in sewage and ensure that the final discharged water quality strictly complies with environmental protection standards. However, in actual operation, RO membrane technology faces significant challenges: impurities in sewage tend to first deposit on the surface of the filter membrane near the inlet and gradually form a layer of sediment that is difficult to remove. This phenomenon leads to local blockage of the filter membrane in the early stage of use, which seriously affects the working efficiency and service life of the equipment.

[0003] As impurities continue to adhere to the surface of the filter membrane, especially in the area near the inlet, the originally wide flow channel gradually narrows, which not only increases the resistance of the fluid passing through, but also causes the water pressure in the adjacent part to continue to rise. This pressure increase will place an additional burden on the RO membrane. When it exceeds the pressure that the membrane material can best withstand, it will accelerate the aging of the membrane material and shorten the service life of the device. In addition, the rapid aging of the membrane material requires frequent replacement of damaged RO membranes, which greatly increases operating costs and has a negative impact on the economic efficiency of environmental governance projects. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a device and method for harmless treatment of leachate in a fly ash landfill.

[0005] The technical implementation scheme of the present invention is: a fly ash landfill leachate harmless treatment device, comprising a bracket, the bracket is provided with a plurality of membrane shells, the membrane shells are provided with water inlets and drain ports, both ends of the membrane shells are installed with end plates, the end plates are provided with channels, and a plurality of filter units and a plurality of connecting pipes are installed in the membrane shells;

[0006] The filter unit includes a shell, which is installed in the adjacent membrane shell, and a rotating ring is rotatably provided on the shell, and the rotating ring and the shell constitute a flow chamber, and an elastic strip is provided on the inner side of the rotating ring, and an inclined plate is fixedly connected to the outer side of the rotating ring, and a first baffle and a second baffle are respectively provided at both ends of the shell, and a plurality of filter membranes are installed between the first baffle and the second baffle, and the elastic strip on the rotating ring is used to move the filter membrane, and a first conduit connected to the adjacent connecting pipe is provided between the first baffle and the second baffle, and the filter membrane is located between the first conduit and the rotating ring, and a plurality of first openings equidistantly distributed circumferentially are provided on the first conduit.

[0007] Preferably, the connecting pipe is provided with a stepped surface which contacts the adjacent first conduit.

[0008] Preferably, the filter membrane between the first baffle and the second baffle is in a relaxed state.

[0009] Preferably, the filtering unit further includes a second conduit which is fixedly connected to the adjacent second baffle, and the second conduit is rotatably connected to the adjacent first baffle. The first baffle is fixedly connected to both the housing and the first conduit. The second conduit is located outside the first conduit. The second baffle is rotatably connected to both the adjacent housing and the adjacent first conduit. The second conduit is provided with a plurality of circular holes circumferentially and equidistantly distributed. The number of the circular holes is the same as the number of the first openings. The inner wall of the second conduit is fixedly connected with a plurality of third baffles circumferentially and equidistantly distributed. The third baffles correspond to the adjacent first openings. A first elastic member is installed between the second conduit and the adjacent first conduit. The first conduit is fixedly connected with a fixing ring rotatably connected to the adjacent second conduit. The first conduit is fixedly connected with a plurality of fourth baffles circumferentially and equidistantly distributed. The fourth baffles are located between two adjacent circular holes in the circumferential direction of the second conduit, and the plurality of fourth baffles and the plurality of third baffles are staggered.

[0010] Preferably, the first baffle is provided with a plurality of sliding cavities circumferentially and equidistantly distributed. A sliding column is slidably arranged in the sliding cavity of the first baffle. A second elastic member is installed between the sliding column and the adjacent first baffle. The second conduit is provided with a plurality of groups of blind holes having the same number as the sliding columns, and the blind holes are used to limit the adjacent sliding columns.

[0011] Preferably, the number of the blind holes in different groups is different, so that different numbers of the sliding columns are located in the adjacent blind holes, and different rotational resistances are generated between the second conduit and the first baffle.

[0012] Preferably, the filtering unit further includes a sliding ring which is fixedly connected to the adjacent second baffle. The sliding ring is provided with a second opening which communicates with the flow chamber.

[0013] Preferably, the filtering unit further includes a third conduit which is fixedly connected to the adjacent first baffle, and the third conduit is hermetically and rotatably connected to the adjacent second baffle. The third conduit is provided with a plurality of equal-diameter openings circumferentially and equidistantly distributed and a plurality of variable-diameter openings circumferentially and equidistantly distributed. The equal-diameter openings are connected to the adjacent variable-diameter openings, and both the equal-diameter openings and the variable-diameter openings are used to communicate with the adjacent circular holes.

[0014] Preferably, the third baffle is offset from the middle of the adjacent first opening, so that the rotation directions of the second conduit during the filtration process and the backwashing process are different.

[0015] A method for harmless treatment of leachate in a fly ash landfill, based on the above-mentioned device for harmless treatment of leachate in a fly ash landfill, includes the following steps:

[0016] S1: Inject the waste liquid into the membrane housing through the water inlet. As the waste liquid continues to be injected, the membrane housing is filled with the waste liquid, and then the waste liquid is discharged through the drain outlet;

[0017] S2: During the injection of the waste liquid, control the water inflow and drainage volume in the membrane housing to make the waste liquid in the membrane housing form a specified pressure value. Under this high pressure, the pure water flow in the waste liquid flows through the filter membrane, round holes, first opening and first conduit and flows out from the channel of the end plate, and the subsequent existing device collects the discharged pure water;

[0018] S3: During the flow of the waste liquid in the membrane housing, the waste liquid also flows through the flow chamber. The flow of the waste liquid impacts the inclined plate, causing the inclined plate to drive the rotating ring to rotate, and the rotating ring rotates to stir the pure water in contact with it to rotate;

[0019] S4: During the flow of the waste liquid, initially there are no impurities attached to the filter membrane. At this time, the amount of pure water passing through the round holes will impact the third baffle, causing the third baffle to drive the second conduit to rotate and twist the first elastic member. The rotation of the second conduit drives the sliding ring to rotate together through the second baffle. At this time, the cross-sectional area of the communication between the second opening and the flow chamber decreases. As the impurities attached to the filter membrane gradually increase, the amount of pure water passing through the round holes and the first opening becomes smaller. Under the action of the first elastic member, the second conduit rotates in the reverse direction, increasing the cross-sectional area of the communication between the second opening and the flow chamber, and controlling the flow path of the flow.

[0020] The beneficial effects of the present invention are as follows: The present invention periodically sweeps and contacts the filter membrane through the rotation of the rotating ring, causing the filter membrane to shake. The shear force generated by the shaking peels off the impurities, that is, delays the attachment speed of impurities on the filter membrane, makes the impurities relatively evenly attached to multiple filter membranes, ensures that all filter membranes work under the same pressure, and improves the working efficiency of the device; By controlling the amount of discharged pure water, the rotation angles of the second conduit, the second baffle and the sliding ring are controlled, changing the state of the filter membrane and the flow area of the liquid inlet end on the flow chamber, so that the flow rates of the waste liquid in different flow paths are different, avoiding the filter membrane being in a high-pressure environment; Through the occlusion of the variable-diameter opening section on the third conduit to the round holes on the second conduit, it is convenient to accelerate the liquid flow rate during the backwashing process, increase the impact of the liquid on the filter membrane, and accelerate the detachment of impurities on the filter membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 Schematic three-dimensional structure diagram of the end plate and the filter unit of the present invention;

[0023] Figure 3 Cross-sectional view of the membrane housing and the end plate of the present invention;

[0024] Figure 4 Exploded view of the filter unit of the present invention;

[0025] Figure 5 Exploded view of the housing and the rotating ring of the present invention;

[0026] Figure 6 Cross-sectional view of the housing and the third conduit of the present invention;

[0027] Figure 7 Cross-sectional view of the first conduit and the second conduit of the present invention;

[0028] Figure 8 Cross-sectional view of the third baffle and the fourth baffle of the present invention;

[0029] Figure 9 Cross-sectional view of the first baffle and the second conduit of the present invention;

[0030] Figure 10 Schematic diagram of the second conduit and the third conduit of the present invention;

[0031] Figure 11 Schematic diagram of the housing and the sliding ring of the present invention.

[0032] Reference numerals in the drawings: 1, bracket; 2, membrane housing; 21, water inlet; 22, drain outlet; 3, end plate; 4, filter unit; 41, housing; 411, rotating ring; 412, flow chamber; 42, first baffle; 43, second baffle; 44, filter membrane; 45, first conduit; 451, first opening; 5, connecting pipe; 51, stepped surface; 6, inclined plate; 7, second conduit; 71, round hole; 72, third baffle; 73, first elastic member; 74, fixing ring; 75, fourth baffle; 76, sliding column; 77, second elastic member; 78, blind hole; 8, third conduit; 81, equal-diameter opening; 82, reduced-diameter opening; 9, sliding ring; 91, second opening. Detailed Description of the Invention

[0033] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] Embodiment 1: An apparatus for harmless treatment of leachate in a fly ash landfill, as shown in Figure 1 and Figure 2As shown in the figure, it includes a bracket 1. The bracket 1 is provided with three membrane housings 2. The membrane housing 2 is provided with a water inlet 21 and a drain outlet 22. End plates 3 are installed at both ends of the membrane housing 2. A channel for purified water discharge is provided in the middle of the end plate 3. A plurality of filtering units 4 are installed in the membrane housing 2. The channel of the end plate 3 is communicated with the water outlet end of the adjacent filtering unit 4. The water outlet ends between two adjacent filtering units 4 are communicated through a connecting pipe 5. The waste liquid (the solution after other existing harmless treatment steps) is injected into the membrane housing 2 through the water inlet 21. Subsequently, the waste liquid is filtered by the filtering unit 4, and the purified water is discharged from the channel of the end plate 3. The high-concentration waste liquid will be discharged through the drain outlet 22 to complete the treatment of the waste liquid. Among them, the three membrane housings 2 work together for the waste liquid treatment operation. After the working set time, the work of one of the membrane housings 2 can be stopped, and the liquid is guided to be injected reversely into the filtering unit 4 through the through holes of the end plate 3 to backwash the filtering unit 4, so that the impurities attached to the filtering unit 4 fall off. After the backwashing operation for the set time, the backwashing operation is stopped, and the waste liquid is guided to enter the membrane housing 2 again for treatment. Subsequently, the filtering units 4 in the three membrane housings 2 are alternately backwashed to ensure that the device continuously treats the waste liquid.

[0035] The specific structures and connection relationships of each component are as follows:

[0036] 1. Filtering unit 4

[0037] As Figures 2 - 5 and Figure 7 shown, the filtering unit 4 includes a housing 41.

[0038] The housing 41 is installed in the adjacent membrane housing 2. The housing 41 is sealed and rotatably provided with a rotating ring 411. The rotating ring 411 and the housing 41 form a flow chamber 412. Elastic strips are provided on the inner side surface of the rotating ring 411. A plurality of inclined plates 6 are fixedly connected to the outer side surface of the rotating ring 411. The plurality of inclined plates 6 are arranged in a spiral pattern. When the liquid passes through the flow chamber 412, the liquid impacts the inclined plates 6, causing the inclined plates 6 to drive the rotating ring 411 to rotate. A first baffle 42 and a second baffle 43 are respectively provided at both ends of the housing 41. Among them, the second baffle 43 is closer to the adjacent drain outlet 22 than the first baffle 42. A plurality of filter membranes 44 are installed between the first baffle 42 and the second baffle 43. Figure 6 In the state shown in the figure, the central axis of the filter membrane 44 is parallel to the central axis of the first baffle 42. At this time, the filter membrane 44 is in a relaxed state. The elastic strip on the rotating ring 411 is used to periodically sweep and contact the filter membrane 44. A first conduit 45 is provided between the first baffle 42 and the second baffle 43. The central axis of the first conduit 45, the central axis of the housing 41, and the central axis of the rotating ring 411 coincide. The filter membrane 44 is located between the first conduit 45 and the rotating ring 411. Six first openings 451 are circumferentially and equidistantly distributed on the first conduit 45. The first conduit 45 is communicated with the adjacent connecting pipe 5.

[0039] The above settings can achieve that during the process of the waste liquid passing through the filter membrane 44, the waste liquid simultaneously flows through the flow chamber 412, and the rotating ring 411 stirs the purified water between it and the first conduit 45 to rotate. At the same time, the elastic strips on the rotating ring 411 periodically sweep and contact the filter membrane 44, causing the filter membrane 44 to shake, assisting impurities to detach from the filter membrane 44, that is, delaying the attachment of impurities to the filter membrane 44, thereby indirectly increasing the effective filtration duration of the filter membrane 44, that is, improving its working efficiency. At the same time, this delaying effect can effectively prevent a large amount of impurities in the waste liquid from attaching to the filter membrane 44 near the water inlet 21 during operation, ensuring that impurities are relatively evenly attached to the filter membranes 44 on all the filtration units 4, and avoiding the formation of excessive pressure that affects the service life of the filter membrane 44.

[0040] 2. Connecting pipe 5

[0041] As Figure 4 shown, the connecting pipe 5 is provided with a stepped surface 51, and sealing rings are provided at both ends of the connecting pipe 5. The stepped surface 51 contacts the end face of the adjacent first conduit 45.

[0042] The above settings can achieve enhancing the sealing performance between the connecting pipe 5 and the adjacent first conduit 45.

[0043] The working process of the device in this embodiment is as follows:

[0044] Preparation process:

[0045] Connect the waste liquid pipeline equipped with the regulating valve to the water inlet 21, connect the recovery pipeline equipped with the regulating valve to the drain outlet 22, and connect the purified water pipeline to the channel of the end plate 3.

[0046] Start working:

[0047] The waste liquid is continuously injected into the membrane housing 2 through the water inlet 21. The waste liquid flows through the middle channel and the flow chamber 412 of the filter membrane 44, gradually filling the membrane housing 2 with the waste liquid. Subsequently, a part of the waste liquid is discharged from the drain port 22. By controlling the degree of the two regulating valves, the discharge amount is made less than the injection amount, and the pressure of the waste liquid in the membrane housing 2 increases. After the pressure increases, the purified water in the waste liquid passes through the filter membrane 44 and enters between the rotating ring 411 and the adjacent first conduit 45. Subsequently, the purified water is discharged through the first opening 451 and the connecting pipe 5 from the channel of the end plate 3. During this process, when the waste liquid flowing in the membrane housing 2 flows through the flow chamber 412, the waste liquid flow impacts the inclined plate 6, causing the inclined plate 6 to drive the rotating ring 411 to rotate. The rotating ring 411 rotates to stir the purified water, causing the purified water to rotate between the rotating ring 411 and the first conduit 45. At the same time, the elastic strips on the rotating ring 411 periodically sweep and contact the filter membrane 44, causing the impurities attached to the filter membrane 44 to detach and flow along the flow path into the subsequent filter membrane 44, ensuring that the impurities are relatively evenly attached to the filter membrane 44, that is, ensuring that the filter membrane 44 is under a relatively stable pressure. Subsequently, the waste liquid treatment is continuously carried out. After the treatment is completed, the work is stopped. At the same time, after the set working time, the device is disassembled and maintained.

[0048] Embodiment 2: On the basis of Embodiment 1, as Figure 3 , Figure 4 and Figures 6 - 8 shown, the filtering unit 4 further includes a second conduit 7. The second conduit 7 is fixedly connected to the adjacent second baffle 43. The central axis of the second conduit 7 coincides with the central axis of the first conduit 45, and the second conduit 7 is located outside the first conduit 45. The second conduit 7 is rotatably connected to the adjacent first baffle 42. The first baffle 42 is fixedly connected to both the housing 41 and the first conduit 45. The second conduit 7 is located outside the first conduit 45. The second baffle 43 is rotatably connected to both the adjacent housing 41 and the adjacent first conduit 45. Six rows of circular holes 71 are circumferentially and equidistantly distributed on the second conduit 7. Six third baffles 72 are fixedly connected to the inner wall of the second conduit 7 in a circumferentially equidistant manner. The third baffles 72 correspond to the adjacent first openings 451. A first elastic member 73 is installed between the second conduit 7 and the adjacent first conduit 45. The first elastic member 73 is a torsion spring that can be twisted in both directions. The first conduit 45 is fixedly connected to a fixing ring 74 that is rotatably connected to the adjacent second conduit 7. Six fourth baffles 75 are fixedly connected to the first conduit 45 in a circumferentially equidistant manner. The fourth baffles 75 are located between two adjacent rows of circular holes 71 in the circumferential direction of the second conduit 7, and the six fourth baffles 75 and the six third baffles 72 are staggered.

[0049] The above settings can achieve adjusting the rotation angles of the second conduit 7 and the second baffle 43 according to the discharge amount of the purified water, and changing the state of the filter membrane 44 between the second baffle 43 and the adjacent first baffle 42.

[0050] As Figure 7 and Figure 9As shown, three sliding cavities are equidistantly distributed circumferentially on the first baffle 42. A sliding column 76 is slidably arranged in the sliding cavity of the first baffle 42. A second elastic member 77 is installed between the sliding column 76 and the adjacent first baffle 42. The second elastic member 77 is a spring and is always in a compressed state. Moreover, the elastic coefficient of the first elastic member 73 is greater than that of the second elastic member 77. The second conduit 7 is provided with three groups of blind holes 78, which are circumferentially distributed. The blind holes 78 are in contact with the adjacent sliding columns 76 to attach Figure 9 Taking the direction in Figure 9 as an example, among them, the number of the lowermost group is four, the number of the upper left group is three, and the number of the upper right group is two. This quantity distribution method is only one of the working modes of this device, and the number of the three groups of blind holes 78 can be set accordingly according to requirements. In the initial state, as shown in

[0051] only the lowermost sliding column 76 is located in the corresponding blind hole 78. When the second conduit 7 rotates by different angles, different numbers of sliding columns 76 are located in the adjacent blind holes 78 to generate different rotational resistances between the second conduit 7 and the first baffle 42.

[0052] As Figure 4 、 Figure 6 and Figure 11 shown, the filtering unit 4 further includes a sliding ring 9, which is fixedly connected to the adjacent second baffle 43. The sliding ring 9 is provided with a second opening 91, and the second opening 91 communicates with the flow chamber 412.

[0053] The above settings can achieve that when the second conduit 7 and the second baffle 43 rotate, they drive the sliding ring 9 to rotate together, changing the size of the flow area between the second opening 91 on the sliding ring 9 and the liquid inlet end in the flow chamber 412, and changing the waste liquid flow rate in different flow paths.

[0054] The working process of this embodiment follows that of Embodiment 1 and is described in detail as follows:

[0055] In the initial state, the second conduit 7 in this device is in Figure 9In the state, only the lowermost sliding column 76 is located in the corresponding blind hole 78. During the waste liquid treatment operation, since there are no impurities attached to the filter membrane 44 in the initial state, the net water volume passing through the filter membrane 44 is the largest at this time. The discharged purified water will squeeze the third baffle 72, causing the third baffle 72 to drive the second conduit 7 to rotate. The second conduit 7 drives the second baffle 43 and the sliding ring 9 to rotate together, and the second conduit 7 twists the first elastic member 73 until the three sliding columns 76 are respectively located in the corresponding blind holes 78. During this process, the three sliding columns 76 move and compress the adjacent second elastic members 77. The rotation of the sliding ring 9 reduces the flow area between its second opening 91 and the liquid inlet end of the flow chamber 412, ensuring that the waste liquid mainly passes through the filter membrane 44.

[0056] As impurities in the waste liquid adhere to the filter membrane 44, the net water volume passing through the filter membrane 44 gradually decreases. When the squeezing force of the discharged purified water on the third baffle 72 is less than the sum of the limiting forces generated by the three sliding columns 76 under the adjacent second elastic members 77, the second conduit 7 drives the second baffle 43 and the sliding ring 9 to rotate in the opposite direction. At this time, the flow area between the second opening 91 and the liquid inlet end of the flow chamber 412 becomes larger, and the waste liquid mainly flows through the flow chamber 412, and part of the waste liquid passes through the filter membrane 44, avoiding the pressure increase caused by the reduction of the flow area due to the adhesion of impurities on the filter membrane 44, ensuring that the filter membrane 44 works under an appropriate pressure, and extending its service life.

[0057] Embodiment 3: On the basis of Embodiment 2, as Figure 4 , Figure 6 , Figure 8 and Figure 10 shown, the filtering unit 4 further includes a third conduit 8. The third conduit 8 is fixedly connected to the adjacent first baffle 42, and the third conduit 8 is in sealed rotational connection with the adjacent second baffle 43. The third conduit 8 is provided with six rows of equal-diameter openings 81 and six rows of variable-diameter openings 82 that are circumferentially equidistantly distributed. The equal-diameter openings 81 are connected to the adjacent variable-diameter openings 82. In the initial state, both the equal-diameter openings 81 and the variable-diameter openings 82 are in communication with the adjacent round holes 71, and the round holes 71 are located at the connection between the adjacent equal-diameter openings 81 and the adjacent variable-diameter openings 82. The third baffle 72 deviates from the middle of the adjacent first opening 451, which is used for different rotational directions of the second conduit 7 during the filtering process and the backwashing process.

[0058] The above settings can achieve that during the backwashing process of the device, the second conduit 7 is controlled to rotate so that the round holes 71 are aligned with the adjacent variable-diameter openings 82, reducing the flow area of the round holes 71 and increasing the liquid flow rate through them, thereby enhancing the impact of the liquid on the adjacent filter membrane 44 and improving the backwashing effect.

[0059] The working process of this embodiment follows that of Embodiment 2 and is described in detail as:

[0060] During the backwashing operation, the injection of waste liquid is stopped, and the squeezing force of the purified water on the third baffle 72 disappears. Under the torsional force of the first elastic member 73, the second conduit 7 swings back and resets in the reverse direction. At the same time, the sliding column 76 reciprocates through the corresponding blind holes 78 and finally returns to the state shown in the attached Figure 9 figure. Subsequently, the purified water is injected into the through holes of the end plate 3, and the purified water will squeeze the third baffle 72 to swing in the reverse direction. The third baffle 72 drives the second conduit 7, the second baffle 43 and the sliding ring 9 to rotate in the reverse direction together. Among them, the reverse rotation of the sliding ring 9 makes the flow area between the second opening 91 and the liquid inlet end of the flow chamber 412 further increase, facilitating the passage of the purified water carrying the removed impurities. The reverse rotation of the second conduit 7 makes the circular hole 71 gradually face the adjacent variable diameter opening 82, and the variable diameter opening 82 blocks the adjacent circular hole 71, reducing the flow area of the circular hole 71. At this time, the purified water sprays out from the circular hole 71 through the first opening 451 and the variable diameter opening 82, flushing the adjacent filter membrane 44. At the same time, the sprayed purified water passes through the filter membrane 44 from the outside to the inside and cleans the impurities on its inner wall, accelerating the detachment of the impurities on the inner wall of the filter membrane 44 and facilitating the subsequent continuous use of the device. After the backwashing is completed, the injection of the purified water is stopped, and the subsequent purified water treatment operation can be repeated.

[0061] Example 4: On the basis of Example 3, as Figures 1 - 11 shown, a method for harmless treatment of leachate in a fly ash landfill, based on the above-mentioned device for harmless treatment of leachate in a fly ash landfill, includes the following steps:

[0062] S1: Inject the waste liquid into the membrane housing 2 through the water inlet 21. As the waste liquid continues to be injected, the membrane housing 2 is filled with the waste liquid, and then the waste liquid is discharged through the drain outlet 22;

[0063] S2: During the injection of the waste liquid, control the water inflow and drainage volume in the membrane housing 2 to make the waste liquid in the membrane housing 2 form a specified pressure value. Under this high pressure, the purified water in the waste liquid flows through the filter membrane 44, the circular hole 71, the first opening 451 and the first conduit 45 and flows out from the channel of the end plate 3. Subsequently, the existing device collects the discharged purified water;

[0064] S3: During the flow of the waste liquid in the membrane housing 2, the waste liquid also flows through the flow chamber 412. The flow of the waste liquid impacts the inclined plate 6, causing the inclined plate 6 to drive the rotating ring 411 to rotate, and the rotating ring 411 rotates to stir the purified water in contact with it to rotate;

[0065] S4: During the flow of the waste liquid, initially, no impurities are attached to the filter membrane 44. At this time, the net water volume passing through the round hole 71 will impact the third baffle 72, causing the third baffle 72 to drive the second conduit 7 to rotate and twist the first elastic member 73. The rotation of the second conduit 7 drives the sliding ring 9 to rotate together through the second baffle 43. At this time, the communication cross-section between the second opening 91 and the flow chamber 412 decreases. As the impurities attached to the filter membrane 44 gradually increase, the net water volume passing through the round hole 71 and the first opening 451 becomes smaller. Under the action of the first elastic member 73, the second conduit 7 rotates in the reverse direction, increasing the communication cross-section between the second opening 91 and the flow chamber 412, and controlling the flow path of the flow.

[0066] Although embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A fly ash landfill leachate harmless treatment device, characterized in that: The invention comprises a support (1), wherein the support (1) is provided with a plurality of membrane shells (2), wherein the membrane shells (2) are provided with water inlets (21) and water outlets (22), end plates (3) are installed at both ends of the membrane shells (2), and the end plates (3) are provided with channels, and wherein a plurality of filter units (4) and a plurality of connecting pipes (5) are installed in the membrane shells (2); The filtration unit (4) comprises a shell (41), the shell (41) being installed in the adjacent membrane shell (2), the shell (41) being rotatably provided with a rotating ring (411), the rotating ring (411) and the shell (41) forming a flow chamber (412), the inner side surface of the rotating ring (411) being provided with an elastic strip, the outer side surface of the rotating ring (411) being fixedly connected with an inclined plate (6), the two ends of the shell (41) being respectively provided with a first baffle plate (42) and a second baffle plate (43), the A plurality of filter membranes (44) are installed between the first baffle plate (42) and the second baffle plate (43); the elastic strip on the rotating ring (411) is used to move the filter membranes (44); a first conduit (45) communicating with the adjacent connecting pipe (5) is provided between the first baffle plate (42) and the second baffle plate (43); the filter membrane (44) is located between the first conduit (45) and the rotating ring (411); and a plurality of first openings (451) equidistantly distributed in the circumferential direction are provided on the first conduit (45); The filter unit (4) further comprises a second conduit (7), the second conduit (7) being fixedly connected to the adjacent second baffle (43), and the second conduit (7) being rotatably connected to the adjacent first baffle (42), the first baffle (42) being fixedly connected to both the shell (41) and the first conduit (45), the second conduit (7) being located outside the first conduit (45), the second baffle (43) being rotatably connected to both the adjacent shell (41) and the adjacent first conduit (45), the second conduit (7) being provided with a plurality of circular holes (71) equidistantly distributed in the circumferential direction, the number of the circular holes (71) being the same as the number of the first openings (451), The inner wall of the second conduit (7) is fixedly connected with a plurality of third baffles (72) equidistantly distributed in the circumferential direction, the third baffles (72) corresponding to adjacent first openings (451), a first elastic member (73) is installed between the second conduit (7) and the adjacent first conduit (45), the first conduit (45) is fixedly connected with a fixing ring (74) rotatably connected to the adjacent second conduit (7), the first conduit (45) is fixedly connected with a plurality of fourth baffles (75) equidistantly distributed in the circumferential direction, the fourth baffle (75) is located between two adjacent circular holes (71) in the circumferential direction of the second conduit (7), and the plurality of fourth baffles (75) and the plurality of third baffles (72) are staggeredly distributed.

2. A fly ash landfill leachate harmless treatment device according to claim 1, characterized in that: The connecting pipe (5) is provided with a step surface (51), and the step surface (51) is in contact with the adjacent first conduit (45).

3. A fly ash landfill leachate harmless treatment device according to claim 2, characterized in that: The filter membrane (44) between the first baffle plate (42) and the second baffle plate (43) is in a relaxed state.

4. A fly ash landfill leachate harmless treatment device according to claim 3, characterized in that: The first baffle plate (42) is provided with a plurality of sliding cavities equidistantly distributed in the circumferential direction, a sliding column (76) is slidably arranged in the sliding cavity of the first baffle plate (42), a second elastic member (77) is installed between the sliding column (76) and an adjacent first baffle plate (42), and the second conduit (7) is provided with a plurality of groups of blind holes (78) having the same number as the sliding columns (76), and the blind holes (78) are used to restrict adjacent sliding columns (76).

5. A fly ash landfill leachate harmless treatment device according to claim 4, characterized in that: Different numbers of blind holes (78) are included in different groups, and different numbers of sliding posts (76) are located in adjacent blind holes (78), so that different rotational resistances are generated between the second guide tube (7) and the first baffle (42).

6. A fly ash landfill leachate harmless treatment device according to claim 5, characterized in that: The filter unit (4) further comprises a sliding ring (9), wherein the sliding ring (9) is fixedly connected to the adjacent second baffle plate (43), and the sliding ring (9) is provided with a second opening (91), wherein the second opening (91) is in communication with the flow chamber (412).

7. A fly ash landfill leachate harmless treatment device according to claim 6, characterized in that: The filter unit (4) further comprises a third conduit (8), the third conduit (8) being fixedly connected to the adjacent first baffle (42), and the third conduit (8) being sealingly rotatably connected to the adjacent second baffle (43), the third conduit (8) being provided with a plurality of equal-diameter openings (81) equidistantly distributed in the circumferential direction and a plurality of variable-diameter openings (82) equidistantly distributed in the circumferential direction, the equal-diameter openings (81) being connected to the adjacent variable-diameter openings (82), and the equal-diameter openings (81) and the variable-diameter openings (82) being both used to communicate with the adjacent circular holes (71).

8. A fly ash landfill leachate harmless treatment device according to claim 7, characterized in that: The third baffle (72) is offset from the middle of the adjacent first opening (451), so that the second conduit (7) rotates in different directions during the filtering process and the backflushing process.

9. A method for harmless treatment of leachate from a fly ash landfill, according to a device for harmless treatment of leachate from a fly ash landfill as claimed in claim 8, characterized in that: The steps include: S1: injecting waste liquid into the membrane shell (2) through the water inlet (21); as the waste liquid is continuously injected, the membrane shell (2) is filled with the waste liquid, and then the waste liquid is discharged through the drain port (22); S2: During the waste liquid injection process, the water inflow and water discharge in the membrane shell (2) are controlled so that the waste liquid in the membrane shell (2) forms a specified pressure value. Under the action of the pressure, the clean water in the waste liquid flows through the filter membrane (44), the circular hole (71), the first opening (451) and the first conduit (45) and flows out from the channel of the end plate (3). The discharged clean water is subsequently collected by the existing device; S3: During the flow of the waste liquid in the membrane shell (2), the waste liquid simultaneously flows through the flow chamber (412), and the flow of the waste liquid impacts the inclined plate (6), causing the inclined plate (6) to drive the rotating ring (411) to rotate, and the rotating ring (411) rotates and stirs the clean water in contact with it to rotate; S4: During the flow of waste liquid, initially, no impurities are attached to the filter membrane (44). At this time, the amount of net water passing through the circular hole (71) will impact the third baffle (72), causing the third baffle (72) to drive the second conduit (7) to rotate and twist the first elastic member (73). The second conduit (7) rotates through the second baffle (43) to drive the sliding ring (9) to rotate together. At this time, the connecting cross section between the second opening (91) and the flow chamber (412) decreases. As the amount of impurities attached to the filter membrane (44) gradually increases, the amount of net water passing through the circular hole (71) and the first opening (451) decreases. Under the action of the first elastic member (73), the second conduit (7) rotates in the opposite direction, causing the connecting cross section between the second opening (91) and the flow chamber (412) to increase, thereby controlling the flow path of the flow.

Images