Treatment device for removing heavy metals from leachate

Abstract

The utility model relates to the field of hazardous waste treatment equipment, in particular to a treatment device for removing heavy metal from percolate, which comprises a cation exchanger, an anion exchanger, a mixed ion exchanger and a communication component. The leachate containing heavy metal ions can be treated by a cation exchanger and an anion exchanger and can form reclaimed water for reuse; the mixed ion exchanger is arranged on one side of the anion exchanger, the mixed ion exchanger is communicated with the anion exchanger and the cation exchanger through the communication assembly, and the mixed ion exchanger can purify water discharged by the anion exchanger. The purified water liquid can be conveyed into the cation exchanger and the anion exchanger for flushing in the regeneration process so as to facilitate in-vivo synchronous regeneration of the cation exchanger and the anion exchanger, so that the treatment effect of removing heavy metals from the leachate can be improved, and the consumption of purified water resources can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of hazardous waste treatment equipment, and specifically relates to a treatment device for removing heavy metals from leachate. BACKGROUND

[0002] Heavy metal ions such as nickel, zinc, chromium, lead and copper are often left in the leachate of industrial waste. Since most of these heavy metal ions are toxic and cannot be naturally decomposed, the leachate, if not treated and discharged naturally, will cause serious harm to the environment and human health. Currently, the methods for removing heavy metal ions from leachate mainly include adsorption, ion exchange, membrane separation, precipitation and the like. Ion exchange, which uses ion exchange resin to exchange and treat heavy metal ions in leachate, is a simple and easy treatment method. When ion exchange is used, different types of heavy metal ions in leachate are focused on, some are treated by cation ion exchangers provided with cation exchange resin, and some are treated by anion ion exchangers provided with anion exchange resin. Cation exchange resin contains strong acid functional groups and is suitable for removing heavy metal ions such as copper, nickel, zinc and trivalent chromium. Anion exchange resin contains strong alkaline functional groups and is suitable for removing heavy metal ions such as hexavalent chromium and lead. Although deionized water treated by single cation exchange or anion exchange removes the main heavy metal ions, it still cannot be used as pure water. In addition, ion exchange resin needs to be regenerated after being used for a period of time. During the regeneration process, the inside of the ion exchanger is often repeatedly flushed with pure water, so a large amount of pure water resources are consumed. Considering that a mixed ion exchanger can highly purify the water liquid after primary treatment, has a light load, can be effectively used for a very long time after regeneration, and can be regenerated in the body at the same time, the use cost is low and convenient. Therefore, if the leachate heavy metal removal treatment device can be improved to integrate the mixed ion exchanger with the cation ion exchanger and the anion ion exchanger, the treatment effect of removing heavy metals from leachate can be improved and the consumption of pure water resources can be reduced, which is a problem to be solved by the present case. SUMMARY

[0003] The utility model discloses a kind of processing devices for removing heavy metals of leachate, including cation exchanger, anion exchanger, mixed ion exchanger and communication assembly, the cation exchanger is placed above anion exchanger and the main drain of cation exchanger is communicated with the main inlet of anion exchanger, heavy metal ion-containing leachate can be handled by cation exchanger and anion exchanger and discharge after removing heavy metal ion Water, mixed ion exchanger is placed in the side of anion exchanger, mixed ion exchanger and anion exchanger, cation exchanger are communicated by communication assembly, mixed ion exchanger can purify the water discharged by anion exchanger and can send purified water to cation exchanger and anion exchanger for flushing in the regeneration process of cation exchanger and anion exchanger.

[0004] To achieve the above object, the technical scheme adopted by the utility model is as follows:

[0005] A kind of processing device for removing heavy metals of leachate, it is characterized by including cation exchanger, anion exchanger, mixed ion exchanger and communication assembly, the communication assembly is equipped with pipeline and delivery pump, the cation exchanger is placed above anion exchanger and the main drain of cation exchanger is communicated with the main inlet of anion exchanger by communication assembly, heavy metal ion-containing leachate can be handled by cation exchanger and anion exchanger and discharge after removing heavy metal ion Water, the mixed ion exchanger is placed in the side of anion exchanger, mixed ion exchanger and anion exchanger, cation exchanger are communicated by communication assembly, mixed ion exchanger can purify the water discharged by anion exchanger and can send purified water to cation exchanger and anion exchanger for flushing in the regeneration process of cation exchanger and anion exchanger.

[0006] The processing device for removing heavy metals of leachate also includes adjusting pool, reclaimed water collection pool, flushing residual liquid collection pool and clean water collection pool, the adjusting pool, reclaimed water collection pool, flushing residual liquid collection pool and clean water collection pool are sequentially and side by side arranged from left to right and are all placed below anion exchanger and mixed ion exchanger.

[0007] The adjusting pool is adjacent to the reclaimed water collecting pool and a shared pool wall is arranged between the two, an overflow hole with a filter screen is arranged at the upper portion of the shared pool wall, and the water in the adjusting pool can be filtered through the filter screen and overflow into the reclaimed water collecting pool.

[0008] The communication assembly comprises a raw water inlet pipe, an intermediate connecting pipe, a deionized water discharge pipe, a purified water inlet pipe, a purified water discharge pipe, a flushing water delivery main pipe, a first backwashing water inlet pipe, a first backwashing water outlet pipe, a second backwashing water inlet pipe, a second backwashing water outlet pipe, a first forward washing water inlet pipe, a first forward washing water outlet pipe, a second forward washing water inlet pipe, a second forward washing water outlet pipe, a backwashing water outlet main pipe, a forward washing water outlet main pipe, a first regeneration liquid input pipe, a second regeneration liquid input pipe, a chemical input pipe, a first delivery pump, a second delivery pump, a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve, an eighth valve and a ninth valve.

[0009] One end of the raw water inlet pipe is connected to a main water inlet at the top of the cation exchanger, the first valve is connected to the raw water inlet pipe, one end of the first forward washing water inlet pipe is also connected to the main water inlet at the top of the cation exchanger, and the other end is connected to the flushing water delivery main pipe, the sixth valve is connected to the first forward washing water inlet pipe, one end of the first backwashing water inlet pipe is connected to a backwashing water inlet at the bottom of the cation exchanger, and the other end is connected to the flushing water delivery main pipe, the fourth valve is connected to the first backwashing water inlet pipe, both ends of the intermediate connecting pipe are connected to a main water outlet at the bottom of the cation exchanger and a main water inlet at the top of the anion exchanger respectively, the second valve is connected to the intermediate connecting pipe, one end of the first backwashing water outlet pipe is connected to a backwashing water outlet at the top of the cation exchanger, and the other end is connected to the backwashing water outlet main pipe, one end of the first forward washing water outlet pipe is also connected to the main water outlet at the bottom of the cation exchanger, and the other end is connected to the forward washing water outlet main pipe, the seventh valve is connected to the first forward washing water outlet pipe, and one end of the first regeneration liquid input pipe is connected to a regeneration liquid input at the upper portion of the cation exchanger.

[0010] The other end of the second backwash inlet pipe is connected to the backwash water conveying main pipe, the fifth valve is connected to the second backwash inlet pipe, one end of the deionized water discharge pipe is connected to the main outlet of the anion exchanger, and the other end is inserted into the adjusting tank, the third valve is connected to the deionized water discharge pipe, one end of the second backwash outlet pipe is connected to the backwash outlet of the anion exchanger, and the other end is connected to the backwash outlet main pipe, one end of the second positive wash outlet pipe is also connected to the main outlet of the anion exchanger, and the other end is connected to the positive wash outlet main pipe, the ninth valve is connected to the second positive wash outlet pipe, and one end of the second regeneration liquid input pipe is connected to the regeneration liquid input port of the anion exchanger.

[0011] One end of the purified water inlet pipe is connected to the water inlet of the mixed ion exchanger, and the other end is inserted into the reclaimed water collecting tank.

[0012] The lower end of the backwash water conveying main pipe is inserted into the purified water collecting tank, and the upper end is sealed, the second conveying pump is connected to the backwash water conveying main pipe, the lower ends of the backwash outlet main pipe and the positive wash outlet main pipe are inserted into the backwash residual liquid collecting tank, and the upper ends are sealed, and one end of the medicament input pipe is inserted into the adjusting tank.

[0013] The cation exchanger and the anion exchanger are both in-vivo synchronous regeneration type ion exchangers, and the mixed ion exchanger is an ex-vivo regeneration type ion exchanger.

[0014] As can be seen from the above description, the treatment device for removing heavy metals from leachate has the advantages that: the mixed ion exchanger, the cation exchanger and the anion exchanger are highly integrated by using the communication assembly, the leachate containing heavy metal ions is treated by the cation exchanger and the anion exchanger respectively and can form reclaimed water for reuse, and the leachate can be sent back to the cation exchanger and the anion exchanger for flushing after purification by the mixed ion exchanger, so that the cation exchanger and the anion exchanger can be regenerated synchronously in-vivo. The treatment device for removing heavy metals from leachate is improved, the treatment effect of removing heavy metals from leachate can be improved, and the consumption of purified water resources can be reduced. The treatment device for removing heavy metals from leachate has the advantages of reasonable design, simple structure, low cost and easy popularization. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1The working principle diagram of a treatment device for removing heavy metals from leachate.

[0016] Figure 2 The connection relationship diagram of the pipes, the delivery pumps and the valves of the communication assembly.

[0017] Figure 3 The position diagram of the shared pool wall between the adjusting pool and the reclaimed water collecting pool.

[0018] Reference signs:

[0019] 1 cation exchanger; 2 anion exchanger; 3 mixed ion exchanger; 4 adjusting pool; 5 reclaimed water collecting pool; 6 flushing residual liquid collecting pool; 7 clean water collecting pool; 8 communication assembly; A1 raw water inlet pipe; A2 intermediate connecting pipe; A3 deionized water discharge pipe; B1 purified water inlet pipe; B2 clean water discharge pipe; B3 flushing water delivery main pipe; B4 first backwashing water inlet pipe; B5 first backwashing water outlet pipe; B6 second backwashing water inlet pipe; B7 second backwashing water outlet pipe; B8 first forward washing water inlet pipe; B9 first forward washing water outlet pipe; B10 second forward washing water inlet pipe; B11 second forward washing water outlet pipe; B12 backwashing water outlet main pipe; B13 forward washing water outlet main pipe; C1 first regeneration liquid input pipe; C2 second regeneration liquid input pipe; C3 medicament input pipe; D1 first delivery pump; D2 second delivery pump; E1 first valve; E2 second valve; E3 third valve; E4 fourth valve; E5 fifth valve; E6 sixth valve; E7 seventh valve; E8 eighth valve; E9 ninth valve. DETAILED DESCRIPTION

[0020] The utility model will be further described below through specific implementation.

[0021] As Figure 1The utility model discloses a kind of heavy metals of leachate removal processing device, including cation exchanger 1, anion exchanger 2, mixed ion exchanger 3, adjusting pool 4, reclaimed water collection pool 5, flushing residual liquid collection pool 6, clean water collection pool 7 and intercommunication component 8.The cation exchanger 1 and anion exchanger 2 are both in-vivo synchronous regeneration type ion exchanger, and the mixed ion exchanger 3 is extra-corporeal regeneration type ion exchanger, and cation exchanger 1, anion exchanger 2 and mixed ion exchanger 3 are all known technology.The cation exchanger 1 is placed above anion exchanger 2, and the mixed ion exchanger 3 is placed at one side of anion exchanger 2, and the adjusting pool 4, reclaimed water collection pool 5, flushing residual liquid collection pool 6 and clean water collection pool 7 are sequentially arranged from left to right and all are placed below anion exchanger 2 and mixed ion exchanger 3, and the mixed ion exchanger 3 is communicated with anion exchanger 2 and cation exchanger 1 by intercommunication component 8.Leachate containing heavy metal ions can be treated by cation exchanger 1 and anion exchanger 2 and discharged water liquid after heavy metal ions are removed, and mixed ion exchanger 3 can purify water liquid discharged by anion exchanger 2 and send purified water liquid to cation exchanger 1 and anion exchanger 2 for flushing cation exchanger 1 and anion exchanger 2 in regeneration process.

[0022] As Figure 1 And Figure 2 The utility model discloses intercommunication component 8 includes raw water inlet pipe A1, intermediate connecting pipe A2, deionized water discharge pipe A3, purified water inlet pipe B1, clean water discharge pipe B2, flushing water delivery main pipe B3, first backwash inlet pipe B4, first backwash outlet pipe B5, second backwash inlet pipe B6, second backwash outlet pipe B7, first positive washing inlet pipe B8, first positive washing outlet pipe B9, second positive washing inlet pipe B10, second positive washing outlet pipe B11, backwash outlet main pipe B12, positive washing outlet main pipe B13, first regeneration liquid input pipe C1, second regeneration liquid input pipe C2, reagent input pipe C3, first delivery pump D1, second delivery pump D2, first valve E1, second valve E2, third valve E3, fourth valve E4, fifth valve E5, sixth valve E6, seventh valve E7, eighth valve E8 and ninth valve E9.

[0023] As Figure 1 And Figure 3 The utility model discloses adjusting pool 4 and reclaimed water collection pool 5 are adjacent and are equipped with the pool wall of shared between the two, is equipped with the overflow hole with filter screen in the upper portion of this shared pool wall, and water liquid in adjusting pool 4 can be filtered through filter screen and overflow to reclaimed water collection pool 5.

[0024] As Figures 1 to 3As shown, the utility model discloses a raw water inlet pipe A1 one end is connected on the main inlet of cation exchanger 1 top, first valve E1 be connected on raw water inlet pipe A1, first positive washing inlet pipe B8 one end also be connected on the main inlet of cation exchanger 1 top, its other end is connected on flush water delivery main B3, sixth valve E6 be connected on first positive washing inlet pipe B8, first backwashing inlet pipe B4 one end be connected on the backwashing inlet of cation exchanger 1 bottom, its other end is connected on flush water delivery main B3, fourth valve E4 be connected on first backwashing inlet pipe B4, the both ends of intermediate connecting pipe A2 are connected on the main outlet of cation exchanger 1 bottom and the main inlet of anion exchanger 2 top respectively, second valve E2 be connected on intermediate connecting pipe A2, first backwashing outlet pipe B5 one end be connected on the backwashing outlet of cation exchanger 1 top, its other end is connected on backwashing outlet main B12, first positive washing outlet pipe B9 one end also be connected on the main outlet of cation exchanger 1 bottom, its other end is connected on positive washing outlet main B13, seventh valve E7 be connected on first positive washing outlet pipe B9, first regeneration liquid input pipe C1 one end be connected on the regeneration liquid input of cation exchanger 1 upper portion. Second positive washing inlet pipe B10 one end also be connected on the main inlet of anion exchanger 2 top, its other end is connected on flush water delivery main B3, eighth valve E8 be connected on second positive washing inlet pipe B10, second backwashing inlet pipe B6 one end be connected on the backwashing inlet of anion exchanger 2 bottom, its other end is connected on flush water delivery main B3, fifth valve E5 be connected on second backwashing inlet pipe B6, deionized water discharge pipe A3 one end be connected on the main outlet of anion exchanger 2 bottom, its other end is inserted into the adjusting pool 4, third valve E3 be connected on deionized water discharge pipe A3, second backwashing outlet pipe B7 one end be connected on the backwashing outlet of anion exchanger 2 top, its other end is connected on backwashing outlet main B12, second positive washing outlet pipe B11 one end also be connected on the main outlet of anion exchanger 2 bottom, its other end is connected on positive washing outlet main B13, ninth valve E9 be connected on second positive washing outlet pipe B11, second regeneration liquid input pipe C2 one end be connected on the regeneration liquid input of anion exchanger 2 upper portion. Purification inlet pipe B1 one end be connected on the inlet of mixed ion exchanger 3 top, its other end is inserted into the water collection pool 5, clean water discharge pipe B2 one end be connected on the outlet of mixed ion exchanger 3 bottom, its other end is inserted into the clean water collection pool 7.The lower end of the flushing water delivery main B3 is inserted into the clean water collecting tank 7, and the upper end is blocked. The second delivery pump D2 is connected to the flushing water delivery main B3. The lower ends of the backwash water main B12 and the forward wash water main B13 are inserted into the flushing residual liquid collecting tank 6, and the upper ends are blocked. One end of the medicament input pipe C3 is inserted into the adjusting tank 4.

[0025] A check valve is arranged on the flushing water delivery main B3 to limit the reverse flow of water. The check valve is not shown in the drawing.

[0026] When the device is used to remove heavy metal ions in leachate, the first valve E1, the second valve E2 and the third valve E3 are opened, and the fourth valve E4, the fifth valve E5, the sixth valve E6, the seventh valve E7, the eighth valve E8 and the ninth valve E9 are closed. The leachate during garbage disposal is pretreated by other devices to form raw water through precipitation, impurity removal and adjustment. The raw water is injected into the cation exchanger 1 through the raw water inlet pipe A1 of the device to perform cation exchange. The generated water flows into the anion exchanger 2 through the intermediate connecting pipe A2 to perform anion exchange. The deionized water generated after the exchange flows into the adjusting tank 4 through the deionized water discharge pipe A3. Then, the medicament is added to the adjusting tank 4 through the medicament input pipe C3 to adjust the pH value and clarify. The water in the upper part of the adjusting tank 4 is filtered through the filter screen on the tank wall shared by the adjusting tank 4 and the intermediate water collecting tank 5, and overflows into the intermediate water collecting tank 5 for collection. The intermediate water in the tank can be reused as non-living water.

[0027] If the cation exchanger 1 and the anion exchanger 2 need to be activated and regenerated, the intermediate water in the intermediate water collecting tank 5 can be sent to the mixed ion exchanger 3 through the purification inlet pipe B1 by using the first delivery pump D1 to perform purification treatment. The treated clean water flows into the clean water collecting tank 7 through the clean water discharge pipe B2 for collection.

[0028] The processing device activates and regenerates the cation exchanger 1 and the anion exchanger 2 in the order of backwashing-regeneration-forward washing. First, the first valve E1, the second valve E2 and the third valve E3 are closed, and the fourth valve E4 and the fifth valve E5 are opened, at this time, the sixth valve E6, the seventh valve E7, the eighth valve E8 and the ninth valve E9 are in the closed state; the second delivery pump D2 is started, and the clean water in the clean water collecting pool 7 is delivered to the first backwashing inlet pipe B4 and the second backwashing inlet pipe B6 by the flushing water delivery main pipe B3, and is respectively sent into the cation exchanger 1 and the anion exchanger 2 by the first backwashing inlet pipe B4 and the second backwashing inlet pipe B6 for reverse flushing, and the residual liquid after flushing is respectively flowed into the backwashing outlet main pipe B12 by the first backwashing outlet pipe B5 and the second backwashing outlet pipe B7, and is converged to the flushing residual liquid collecting pool 6 for centralized collection, and the centralized collected flushing residual liquid can also be reprocessed by the device. After backwashing, the second delivery pump D2 is stopped and the fourth valve E4 and the fifth valve E5 are closed, at this time, the first valve E1, the second valve E2, the third valve E3, the sixth valve E6, the seventh valve E7, the eighth valve E8 and the ninth valve E9 are still in the closed state; different regeneration liquids are respectively sent into the cation exchanger 1 and the anion exchanger 2 by the first regeneration liquid input pipe C1 and the second regeneration liquid input pipe C2 to regenerate the first regeneration liquid input pipe C1 and the second regeneration liquid input pipe C2. After regeneration, the sixth valve E6, the seventh valve E7, the eighth valve E8 and the ninth valve E9 are opened, at this time, the first valve E1, the second valve E2, the third valve E3, the fourth valve E4 and the fifth valve E5 are still in the closed state; the second delivery pump D2 is started, and the clean water is delivered to the first forward washing inlet pipe B8 and the second forward washing inlet pipe B10 by the flushing water delivery main pipe B3, and is respectively sent into the cation exchanger 1 and the anion exchanger 2 by the first forward washing inlet pipe B8 and the second forward washing inlet pipe B10 for forward flushing, and the residual liquid after flushing is respectively flowed into the backwashing outlet main pipe B12 by the first forward washing outlet pipe B9 and the second forward washing outlet pipe B11, and is converged to the flushing residual liquid collecting pool 6 for centralized collection, and the cation exchanger 1 and the anion exchanger 2 are activated and regenerated. If the mixed ion exchanger 3 needs to be regenerated, the ion exchange resin in it can be moved to the external treatment or directly replaced with new ion exchange resin.

[0029] The utility model discloses an improved heavy metal removal treatment device for percolate, which is highly integrated with the mixed ion exchanger 3, the cation exchanger 1 and the anion exchanger 2 by the communication assembly 8. The percolate containing heavy metal ions is treated by the cation exchanger 1 and the anion exchanger 2 respectively and can form reclaimed water for reuse. The purified percolate can be sent back to the cation exchanger 1 and the anion exchanger 2 for flushing to facilitate the in-vivo synchronous regeneration of the cation exchanger 1 and the anion exchanger 2. Thus, the treatment effect of heavy metal removal of the percolate can be improved and the consumption of clean water resources can be reduced.

[0030] The above is only one specific embodiment of the utility model, but the design concept of the utility model is not limited to this. Any non-substantial change of the utility model by using this concept should be regarded as an act of infringing the protection scope of the utility model.

Claims

1. A treatment device for removing heavy metals from leachate, characterized by: The device comprises a cation exchanger (1), an anion exchanger (2), a mixed ion exchanger (3) and a communication assembly (8), the communication assembly (8) is provided with pipes and delivery pumps, the cation exchanger (1) is arranged above the anion exchanger (2), the main water outlet of the cation exchanger (1) and the main water inlet of the anion exchanger (2) are communicated by the communication assembly (8), the leachate containing heavy metal ions can be treated by the cation exchanger (1) and the anion exchanger (2) and the water liquid after removing the heavy metal ions is discharged, the mixed ion exchanger (3) is arranged on one side of the anion exchanger (2), the mixed ion exchanger (3) and the anion exchanger (2) and the cation exchanger (1) are communicated by the communication assembly (8), the mixed ion exchanger (3) can purify the water liquid discharged by the anion exchanger (2) and can send the purified water liquid to the cation exchanger (1) and the anion exchanger (2) to flush the cation exchanger (1) and the anion exchanger (2) during the regeneration process.

2. The treatment device for removing heavy metals from leachate according to claim 1, characterized by: The device also comprises an adjusting pool (4), a reclaimed water collecting pool (5), a flushing residual liquid collecting pool (6) and a purified water collecting pool (7), the adjusting pool (4), the reclaimed water collecting pool (5), the flushing residual liquid collecting pool (6) and the purified water collecting pool (7) are arranged in sequence and side by side and are all arranged below the anion exchanger (2) and the mixed ion exchanger (3).

3. The apparatus for removing heavy metals from leachate according to claim 2, wherein: The adjusting pool (4) is adjacent to the reclaimed water collecting pool (5) and a shared pool wall is arranged between the adjusting pool (4) and the reclaimed water collecting pool (5), an overflow hole with a filter screen is arranged at the upper part of the shared pool wall, the water liquid in the adjusting pool (4) can be filtered by the filter screen and overflow to the reclaimed water collecting pool (5).

4. The treatment device for removing heavy metals from leachate according to claim 3, characterized by: The communication assembly (8) comprises a raw water inlet pipe (A1), an intermediate connecting pipe (A2), a deionized water discharge pipe (A3), a purified water inlet pipe (B1), a purified water discharge pipe (B2), a flushing water delivery main pipe (B3), a first backwashing water inlet pipe (B4), a first backwashing water outlet pipe (B5), a second backwashing water inlet pipe (B6), a second backwashing water outlet pipe (B7), a first forward washing water inlet pipe (B8), a first forward washing water outlet pipe (B9), a second forward washing water inlet pipe (B10), a second forward washing water outlet pipe (B11), a backwashing water outlet main pipe (B12), a forward washing water outlet main pipe (B13), a first regeneration liquid input pipe (C1), a second regeneration liquid input pipe (C2), a medicament input pipe (C3), a first delivery pump (D1), a second delivery pump (D2), a first valve (E1), a second valve (E2), a third valve (E3), a fourth valve (E4), a fifth valve (E5), a sixth valve (E6), a seventh valve (E7), an eighth valve (E8) and a ninth valve (E9).

5. The apparatus for removing heavy metals from leachate according to claim 4, wherein: One end of the raw water inlet pipe (A1) is connected to the main water inlet at the top of the cation exchanger (1), the first valve (E1) is connected to the raw water inlet pipe (A1), one end of the first forward washing water inlet pipe (B8) is also connected to the main water inlet at the top of the cation exchanger (1), and the other end is connected to the flushing water delivery main (B3), the sixth valve (E6) is connected to the first forward washing water inlet pipe (B8), one end of the first backwashing water inlet pipe (B4) is connected to the backwashing water inlet at the bottom of the cation exchanger (1), and the other end is connected to the flushing water delivery main (B3), the fourth valve (E4) is connected to the first backwashing water inlet pipe (B4), both ends of the intermediate connecting pipe (A2) are connected to the main water outlet at the bottom of the cation exchanger (1) and the main water inlet at the top of the anion exchanger (2) respectively, the second valve (E2) is connected to the intermediate connecting pipe (A2), one end of the first backwashing water outlet pipe (B5) is connected to the backwashing water outlet at the top of the cation exchanger (1), and the other end is connected to the backwashing water outlet main (B12), one end of the first forward washing water outlet pipe (B9) is also connected to the main water outlet at the bottom of the cation exchanger (1), and the other end is connected to the forward washing water outlet main (B13), the seventh valve (E7) is connected to the first forward washing water outlet pipe (B9), one end of the first regeneration liquid inlet pipe (C1) is connected to the regeneration liquid inlet at the upper part of the cation exchanger (1).

6. The apparatus for removing heavy metals from leachate according to claim 5, wherein: One end of the second forward washing water inlet pipe (B10) is also connected to the main water inlet at the top of the anion exchanger (2), and the other end is connected to the flushing water delivery main (B3), the eighth valve (E8) is connected to the second forward washing water inlet pipe (B10), one end of the second backwashing water inlet pipe (B6) is connected to the backwashing water inlet at the bottom of the anion exchanger (2), and the other end is connected to the flushing water delivery main (B3), the fifth valve (E5) is connected to the second backwashing water inlet pipe (B6), one end of the deionized water discharge pipe (A3) is connected to the main water outlet at the bottom of the anion exchanger (2), and the other end is inserted into the adjusting tank (4), the third valve (E3) is connected to the deionized water discharge pipe (A3), one end of the second backwashing water outlet pipe (B7) is connected to the backwashing water outlet at the top of the anion exchanger (2), and the other end is connected to the backwashing water outlet main (B12), one end of the second forward washing water outlet pipe (B11) is also connected to the main water outlet at the bottom of the anion exchanger (2), and the other end is connected to the forward washing water outlet main (B13), the ninth valve (E9) is connected to the second forward washing water outlet pipe (B11), one end of the second regeneration liquid inlet pipe (C2) is connected to the regeneration liquid inlet at the upper part of the anion exchanger (2).

7. The apparatus for removing heavy metals from leachate according to claim 6, wherein: One end of the purified water inlet pipe (B1) is connected to the water inlet at the top of the mixed ion exchanger (3), and the other end is inserted into the reclaimed water collecting tank (5). One end of the purified water discharge pipe (B2) is connected to the water outlet at the bottom of the mixed ion exchanger (3), and the other end is inserted into the purified water collecting tank (7).

8. The treatment device for removing heavy metals from leachate according to claim 7, characterized by: The lower end of the flushing water delivery main pipe (B3) is inserted into the purified water collecting tank (7). The second delivery pump (D2) is connected to the flushing water delivery main pipe (B3). The lower ends of the backwash water outlet main pipe (B12) and the forward wash water outlet main pipe (B13) are both inserted into the flushing residual liquid collecting tank (6). One end of the medicament input pipe (C3) is inserted into the adjusting tank (4).

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