A slag field leachate ammonia-nitrogen treatment system

Abstract

The utility model relates to sewage treatment technical field discloses a kind of for residue field leachate ammonia nitrogen treatment system, and the residue field leachate ammonia nitrogen treatment system includes: sequentially connected preliminary calcium removal device, resin calcium removal device, resin ammonia nitrogen removal device and acidity adjusting device.Preliminary calcium removal device is used to carry out the first calcium ion precipitation reaction of residue field leachate and obtain first aqueous solution;Resin calcium removal device is used to carry out the second calcium ion precipitation reaction of first aqueous solution and obtain second aqueous solution;Resin ammonia nitrogen removal device is used to carry out the ammonia nitrogen ion precipitation reaction of second aqueous solution and obtain third aqueous solution;And acidity adjusting device is used to carry out the acidity adjustment of third aqueous solution and obtain aqueous solution meeting water discharge standard.The utility model by above scheme, before carrying out ammonia nitrogen removal to residue field leachate, first carry out twice calcium removal, improve ammonia nitrogen removal effect, reduce the hardness and impurity content of final aqueous solution.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to an ammonia nitrogen treatment system for leachate from slag yards. Background Technology

[0002] With the rapid development of the metallurgical industry, the amount of waste slag generated is also increasing. This waste slag is usually piled up in slag yards for reuse. During the stockpiling process, leachate is generated, which will pollute the environment if it is not treated.

[0003] Traditional leachate treatment systems typically only include ammonia nitrogen ion treatment devices, which are ineffective and result in aqueous solutions with high calcium content, high hardness, and many impurities. Utility Model Content

[0004] In view of this, the present invention proposes an ammonia nitrogen treatment system for slag yard leachate, which solves the technical problem of poor treatment effect of traditional leachate treatment systems on slag yard leachate.

[0005] On one hand, this utility model provides an ammonia nitrogen treatment system for leachate from a slag yard. The system includes: a preliminary calcium removal device, a resin calcium removal device connected to the preliminary calcium removal device, a resin ammonia nitrogen removal device connected to the resin calcium removal device, and an acidity adjustment device connected to the resin ammonia nitrogen removal device. The preliminary calcium removal device performs a first calcium ion precipitation reaction in the leachate to obtain a first aqueous solution; the resin calcium removal device performs a second calcium ion precipitation reaction in the first aqueous solution to obtain a second aqueous solution; the resin ammonia nitrogen removal device performs an ammonia nitrogen ion precipitation reaction in the second aqueous solution to obtain a third aqueous solution; and the acidity adjustment device adjusts the pH of the third aqueous solution to obtain an aqueous solution that meets the standards for external drainage.

[0006] In some embodiments, the calcium removal device includes a first calcium removal tank, the outlet of which is connected to the resin calcium removal device.

[0007] In some embodiments, the calcium removal device further includes a solid-liquid separation device, the inlet of which is connected to the first calcium removal tank, and the outlet of which is connected to the resin calcium removal device.

[0008] In some embodiments, the resin calcium removal device includes a first resin calcium removal tank, the inlet of the first resin calcium removal tank is connected to the outlet of the first resin calcium removal tank, and the outlet of the first resin calcium removal tank is connected to the resin ammonia nitrogen removal device.

[0009] In some embodiments, the resin calcium removal device further includes a backup resin calcium removal tank, which is connected in parallel with the first resin calcium removal tank.

[0010] In some embodiments, the resin decalcification device further includes a filtration device, the inlet of which is connected to the outlet of the first decalcification tank, and the outlet of which is connected to the inlet of the first resin decalcification tank.

[0011] In some embodiments, the resin decalcification device further includes a second decalcification tank, the inlet of which is connected to the outlet of the filtration device, and the outlet of which is connected to the inlet of the first resin decalcification tank.

[0012] In some embodiments, the resin ammonia nitrogen removal device includes a second resin calcium removal tank and a resin ammonia nitrogen removal tank. The inlet of the second resin calcium removal tank is connected to the outlet of the first resin calcium removal tank, the outlet of the second resin calcium removal tank is connected to the inlet of the resin ammonia nitrogen removal tank, and the outlet of the resin ammonia nitrogen removal tank is connected to the acidity adjustment device.

[0013] In some embodiments, the resin ammonia nitrogen removal device further includes a backup resin ammonia nitrogen removal tank, which is connected in parallel with the resin ammonia nitrogen removal tank.

[0014] In some embodiments, the acidity adjustment device includes an acidity adjustment tank, the inlet of which is connected to the resin ammonia nitrogen removal device.

[0015] This utility model has at least the following beneficial effects: This invention provides an ammonia nitrogen treatment system for leachate from slag heaps. The system includes: a preliminary calcium removal device, a resin calcium removal device, a resin ammonia nitrogen removal device, and an acidity adjustment device connected in sequence. The preliminary calcium removal device performs a first calcium ion precipitation reaction in the leachate to obtain a first aqueous solution. The resin calcium removal device performs a second calcium ion precipitation reaction in the first aqueous solution to obtain a second aqueous solution. The resin ammonia nitrogen removal device performs an ammonia nitrogen ion precipitation reaction in the second aqueous solution to obtain a third aqueous solution. The acidity adjustment device adjusts the pH of the third aqueous solution to obtain an aqueous solution that meets the discharge standards. Based on the ammonia nitrogen treatment system for leachate from slag heaps provided by this invention, the leachate undergoes a first calcium ion precipitation reaction in the preliminary calcium removal device to obtain a first aqueous solution, which is then discharged to the resin calcium removal device. The first aqueous solution undergoes a second calcium ion precipitation reaction in the resin calcium removal device to obtain a second aqueous solution, which is also discharged to the resin ammonia nitrogen removal device. The second aqueous solution undergoes an ammonia nitrogen ion precipitation reaction in the resin ammonia nitrogen removal device to obtain a third aqueous solution, which is then discharged from the resin ammonia nitrogen removal device to the acidity adjustment device. The acidity of the third aqueous solution is adjusted in the acidity adjustment device to finally obtain an aqueous solution that meets the external wastewater standards, which is then discharged.

[0016] This invention enables two-stage calcium removal of leachate from slag yards using a preliminary calcium removal device and a resin calcium removal device. This removes calcium ions from the leachate, avoids scaling of the ammonia nitrogen removal resin during ammonia nitrogen removal, improves the ammonia nitrogen removal efficiency, and reduces the hardness and impurity content of the final aqueous solution. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a slag yard leachate ammonia nitrogen treatment system provided in this embodiment of the present invention; Figure 2 A schematic diagram of another ammonia nitrogen treatment system for slag yard leachate provided in this embodiment of the present invention; Figure 3 This is a schematic diagram of the process of treating leachate in the slag yard leachate ammonia nitrogen treatment system provided in this embodiment of the utility model.

[0019] [Explanation of Labels in the Attached Image] 10: Preliminary calcium removal device; 11: First calcium removal tank; 12: Solid-liquid separation equipment; 20: Resin decalcification device; 21: First resin decalcification tank; 22: Filtration equipment; 23: Second decalcification tank; 30: Resin ammonia nitrogen removal device; 31: Second resin calcium removal tank; 32: Resin ammonia nitrogen removal tank; 40: Acidity adjustment device; 41: Acidity adjustment tank. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be further described in detail below with reference to specific examples and accompanying drawings.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as “length,” “width,” “upper,” “lower,” “left,” “right,” “front,” “rear,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer” indicate orientations or positions based on the orientations or positions shown in the accompanying drawings and are merely for ease of description and should not be construed as limiting the invention.

[0022] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this utility model are intended to cover non-exclusive inclusion; the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish different objects, not to describe a specific order. "A plurality of" means two or more, unless otherwise explicitly specified.

[0023] In the description, claims, and accompanying drawings of this utility model, when an element is referred to as "fixed to," "mounted to," "set on," or "connected to" another element, it can be directly or indirectly located on that other element. For example, when an element is referred to as "connected to" another element, it can be directly or indirectly connected to that other element.

[0024] With the rapid development of the metallurgical industry, the amount of waste slag generated is also increasing. This waste slag is usually piled up in slag yards for reuse. During the stockpiling process, leachate is generated, which contains ions such as ammonia nitrogen (50-200 mg / L) and calcium (200-400 mg / L). It has a complex composition and is alkaline (pH 8.0-12.0). If this leachate is not treated, it will pollute the environment.

[0025] Traditional leachate treatment systems typically only include ammonia nitrogen ion treatment devices, which are ineffective and result in aqueous solutions with high calcium content, high hardness, and many impurities.

[0026] The present invention will now be described in detail with reference to the embodiments and accompanying drawings.

[0027] The first aspect of this utility model provides a system for treating ammonia nitrogen in leachate from slag heaps, such as... Figure 1 As shown, the ammonia nitrogen treatment system for slag yard leachate includes: a preliminary calcium removal device 10, a resin calcium removal device 20, a resin ammonia nitrogen removal device 30, and an acidity adjustment device 40 connected in sequence. The preliminary calcium removal device 10 is used to perform the first calcium ion precipitation reaction of the slag yard leachate and obtain a first aqueous solution; the resin calcium removal device 20 is used to perform the second calcium ion precipitation reaction of the first aqueous solution and obtain a second aqueous solution; the resin ammonia nitrogen removal device 30 is used to perform the ammonia nitrogen ion precipitation reaction of the second aqueous solution and obtain a third aqueous solution; and the acidity adjustment device 40 is used to adjust the acidity and alkalinity of the third aqueous solution and obtain an aqueous solution that meets the external drainage standards.

[0028] In this embodiment of the invention, the preliminary calcium removal device 10 is used to carry the discharged leachate from the slag yard, and after the first calcium ion precipitation reaction of the leachate is completed, the resulting first aqueous solution is discharged; the resin calcium removal device 20 is used to carry the discharged first aqueous solution, and after the second calcium ion precipitation reaction of the first aqueous solution is completed, the resulting second aqueous solution is discharged to the resin ammonia nitrogen removal device 30; the resin ammonia nitrogen removal device 30 is used to carry the discharged second aqueous solution, and after the ammonia nitrogen ion precipitation reaction of the second aqueous solution is completed, the resulting third aqueous solution is discharged to the acidity adjustment device 40; the acidity adjustment device 40 is used to carry the third aqueous solution, and after the acidity and alkalinity of the third aqueous solution is adjusted, the resulting aqueous solution that meets the external drainage standards is discharged.

[0029] In this embodiment of the invention, the preliminary calcium removal device 10, the resin calcium removal device 20, the grease ammonia nitrogen removal device 30, and the acidity adjustment device 40 can each control the inflow and outflow of the solution through valves.

[0030] The ammonia nitrogen treatment system for slag yard leachate operates as follows: The preliminary calcium removal device 10 contains the slag yard leachate, which can be pre-pumped into the device via a water pump. In the preliminary calcium removal device 10, the leachate undergoes a first calcium ion precipitation reaction. After the reaction, a first aqueous solution is obtained and discharged from the device to the resin calcium removal device 20. The first aqueous solution undergoes a second calcium ion precipitation reaction in the resin calcium removal device 20. After the reaction, a second aqueous solution is obtained and discharged from the resin calcium removal device 20 to the resin ammonia nitrogen removal device 30. The second aqueous solution undergoes an ammonia nitrogen ion precipitation reaction in the resin ammonia nitrogen removal device 30. After the reaction, a third aqueous solution is obtained and discharged from the resin ammonia nitrogen removal device 30 to the acidity adjustment device 40. The third aqueous solution undergoes acidity adjustment in the acidity adjustment device 40 to obtain an aqueous solution that meets the external discharge standards and is then discharged.

[0031] In this embodiment of the invention, the slag yard leachate can be decalcified twice through the preliminary calcium removal device 10 and the resin calcium removal device 20, thereby removing calcium ions from the slag yard leachate. This avoids scaling of the ammonia nitrogen removal resin when removing ammonia nitrogen ions through the resin ammonia nitrogen removal device 30, improves the ammonia nitrogen removal effect, and reduces the hardness and impurity content of the final aqueous solution.

[0032] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the preliminary calcium removal device 10 may include a first calcium removal tank 11, the outlet of which is connected to the resin calcium removal device 20.

[0033] In this embodiment of the invention, the inlet and outlet of the first decalcification tank 11 can be connected to valves respectively. The opening and closing of these valves can control the inflow and outflow of solution from the first decalcification tank 11. For example, when the valve connected to the inlet of the first decalcification tank 11 is open, leachate from the slag heap can be discharged into the first decalcification tank. For example, when the valve connected to the outlet of the first decalcification tank 11 is open, the solution in the first decalcification tank can be discharged. For example, when the valve connected to the outlet of the first decalcification tank 11 is open, the solution in the first decalcification tank 11 can be discharged.

[0034] In some embodiments of this utility model, the preliminary calcium removal device 10 may further include a solid-liquid separation device 12, the inlet of which is connected to the first calcium removal tank 11, and the outlet of which is connected to the resin calcium removal device 20.

[0035] In this embodiment of the invention, the solid-liquid separation device 12 can be a centrifuge or a centrifugal filter. The inlet and outlet of the solid-liquid separation device 12 can be connected to valves respectively. The opening and closing of these valves can control the flow of solution into and out of the solid-liquid separation device 12.

[0036] In this embodiment of the invention, a water pump can also be connected between the solid-liquid separation device 12 and the first calcium removal tank 11, so that the aqueous solution discharged from the first calcium removal tank 11 can be discharged into the solid-liquid separation device 12 by the water pump.

[0037] like Figure 3 As shown in the embodiment of this utility model, the ammonia nitrogen treatment system for leachate from a slag yard includes four processes, P1 to P4, when treating the leachate. P1 is a preliminary calcium removal process, used to remove calcium from the leachate by introducing CO2 into the leachate, thereby precipitating calcium carbonate and obtaining a partially calcium-removed aqueous solution. P2 is a resin calcium removal process, used to add calcium-removing resin to the aqueous solution obtained after preliminary calcium removal. This calcium-removing resin can be placed in the resin calcium removal device 20 before treating the leachate from the slag yard, so that the aqueous solution obtained after preliminary calcium removal can be further decalcified in the resin calcium removal device 20, further reducing the calcium concentration in the aqueous solution, ensuring that the calcium ion concentration in the aqueous solution does not affect the subsequent ammonia nitrogen removal resin process. When the calcium-removing resin is saturated, it can be regenerated with dilute hydrochloric acid before use. P3 is the resin ammonia nitrogen removal process, which involves adding ammonia nitrogen removal resin to the aqueous solution obtained after resin calcium removal. This ammonia nitrogen removal resin is pre-placed in the resin ammonia nitrogen removal device 30 before leachate treatment. During leachate treatment, the resin ammonia nitrogen removal device 30 removes ammonia nitrogen ions from the aqueous solution obtained after resin calcium removal, thereby reducing the concentration of ammonia nitrogen ions in the aqueous solution. When the ammonia nitrogen removal resin becomes saturated, dilute sulfuric acid can be added to regenerate the saturated resin before reuse. P4 is the acidity adjustment process, which involves adding liquid alkali to the aqueous solution obtained after ammonia nitrogen removal to adjust the pH, resulting in an aqueous solution that meets emission standards.

[0038] The ammonia nitrogen treatment system for leachate from slag heaps provided in this embodiment of the invention operates as follows: The leachate from the slag yard is transported to the first decalcification tank 11 of the preliminary decalcification device 10. CO2 is then introduced into the leachate from the slag yard in the first decalcification tank 11 to cause calcium ions to precipitate out in the form of calcium carbonate. The aqueous solution produced by the first decalcification tank 11 is then discharged through its outlet to the solid-liquid separation device 12. The solid-liquid separation device 12 performs solid-liquid separation on the aqueous solution produced by the first decalcification tank to remove solid impurities such as calcium carbonate from the aqueous solution. Subsequently, the aqueous solution obtained through the solid-liquid separation device 12 is discharged into the resin calcium removal device 20, where it undergoes ion exchange resin treatment to obtain a resin-treated aqueous solution. This solution is then discharged from the resin calcium removal device 20 into the resin ammonia nitrogen removal device 30 for ion exchange resin adsorption to remove ammonia nitrogen, resulting in a resin-treated aqueous solution. Finally, this solution is discharged from the resin ammonia nitrogen removal device 30 into the acidity adjustment device 40 to adjust the pH value of the solution, thus obtaining an aqueous solution with a pH value meeting the specified conditions.

[0039] According to the embodiments of this utility model, the first calcium removal tank 11 of the preliminary calcium removal device 10 can initially remove calcium from the leachate of the slag yard, reducing the hardness of the final aqueous solution. The solid-liquid separation device 12 can remove impurities from the aqueous solution, reducing the content of solid impurities in the final aqueous solution. The resin calcium removal device 20 can perform secondary calcium removal from the leachate of the slag yard, further reducing the hardness of the final aqueous solution.

[0040] According to the embodiments of this utility model, before removing ammonia nitrogen from the leachate, two calcium removal processes are performed first to avoid scaling of the ammonia nitrogen removal resin when removing ammonia nitrogen ions through the resin ammonia nitrogen removal device 30, which would otherwise result in poor ammonia nitrogen removal efficiency. This improves the ammonia nitrogen removal efficiency and reduces the hardness and impurity content of the final aqueous solution.

[0041] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the resin calcium removal device 20 may include a first resin calcium removal tank 21, the inlet of the first resin calcium removal tank 21 is connected to the outlet of the first calcium removal tank 11, and the outlet of the first resin calcium removal tank 21 is connected to the resin ammonia nitrogen removal device 30.

[0042] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the resin decalcification device 20 may further include a filter device 22, the inlet of which is connected to the outlet of the first decalcification tank 11, and the outlet of which is connected to the inlet of the first resin decalcification tank 21.

[0043] In some embodiments of this utility model, such as Figure 1and Figure 2 As shown, the inlet of the filter device 22 of the resin decalcification device 20 can also be connected to the outlet of the solid-liquid separation device 12, and the outlet of the filter device 22 is connected to the inlet of the first resin decalcification tank 21.

[0044] In this embodiment of the invention, the solid-liquid separation device 12 and the filtration device 22 can be connected by a water pump, which can discharge the aqueous solution discharged from the solid-liquid separation device 12 into the filtration device 22.

[0045] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the resin decalcification device 20 may further include a second decalcification tank 23, the inlet of which is connected to the outlet of the filter device 22, and the outlet of which is connected to the inlet of the first resin decalcification tank 21.

[0046] In this embodiment of the invention, the resin calcium removal device 20 may include a filter device 22, a second calcium removal tank 23, and a first resin calcium removal tank 21 connected in sequence. More specifically, the inlet of the filter device 22 may be connected to the outlet of the solid-liquid separation device 12, the outlet of the filter device 22 may be connected to the inlet of the second calcium removal tank 23, and the outlet of the second calcium removal tank 23 may be connected to the inlet of the first resin calcium removal tank 21.

[0047] The filtration device 22 can be a bag filter or a microfiltration machine, and it can also have an automatic cleaning function. The filtration device can further purify the aqueous solution obtained from the solid-liquid separation device 12, reducing suspended solids entering the resin calcium removal tank 21. The second calcium removal tank 23 is used to collect the aqueous solution produced by the filtration device 22. The first resin calcium removal tank 21 is used to further reduce the calcium content in the aqueous solution after CO2 calcium removal. Resin calcium removal treatment in the first resin calcium removal tank 21 can further reduce the calcium content in the aqueous solution. In some examples, calcium removal resin can be added to the first resin calcium removal tank 21 in advance, so that during leachate treatment, the calcium removal resin carried in the first resin calcium removal tank 21 can react with the discharged aqueous solution to induce calcium precipitation, thereby further reducing the calcium content in the aqueous solution. For example, the calcium removal resin can be an aminophosphonic acid chelating ion exchange resin. Thus, through two calcium removal processes, the calcium concentration in the aqueous solution can be reduced to below 5 mg / L. In some examples, after the calcium removal resin is saturated, it can be desorbed with 5% dilute hydrochloric acid, thereby enabling the reuse of the calcium removal resin. The calcium chloride solution obtained from the desorption process can be further concentrated and reused.

[0048] The resin decalcification device 20 may further include an online hardness detection device connected to another outlet of the first resin decalcification tank 21, used to detect the hardness of the aqueous solution in the first resin decalcification tank 21. The resin decalcification device 20 provided in this embodiment of the invention, through the online hardness detection device, can detect the hardness of the aqueous solution in the first resin decalcification tank 21, and thus, when the hardness of the aqueous solution meets the requirements, discharge the aqueous solution in the first resin decalcification tank 21 to the resin ammonia nitrogen removal device for further treatment.

[0049] In some embodiments of this utility model, such as Figure 1 As shown, the resin calcium removal device 20 may also include a resin calcium removal backup tank (not shown in the figure), which is connected in parallel with the first resin calcium removal tank 21.

[0050] In this embodiment of the invention, the ammonia nitrogen treatment system for leachate from the slag heap may further include a three-way pipe, which may include three interconnected pipes and a first interface, a second interface, and a third interface respectively connected to each pipe. Specifically, the first interface may be connected to the inlet of the first resin decalcification tank 21, the second interface may be connected to the inlet of the backup resin decalcification tank, and the third interface may be connected to the outlet of the second decalcification tank 23.

[0051] In some scenarios, the pipe connecting the first resin decalcification tank 21 and the second decalcification tank 23 of the leachate ammonia nitrogen treatment system provided in this embodiment of the invention is open, while the pipe connecting the standby resin decalcification tank and the second decalcification tank 23 is closed. When the online hardness testing device detects that the hardness of the aqueous solution in the first resin decalcification tank 21 meets the requirements, the aqueous solution in the first resin decalcification tank 21 is discharged to the resin ammonia nitrogen removal device for treatment, and the pipe connecting the first resin decalcification tank 21 and the second decalcification tank 23 is set to be closed, while the pipe connecting the standby resin decalcification tank and the second decalcification tank 23 is set to be open.

[0052] In some examples, the ammonia nitrogen treatment system for leachate from the slag heap may further include a first valve, a second valve, and a third valve. The first valve may be connected between the first port of a tee pipe and the inlet of the first resin decalcification tank 21. The second valve may be connected between the second port of the tee pipe and the inlet of the backup resin decalcification tank. The third valve may be connected between the third port of the tee pipe and the outlet of the second decalcification tank 23. By opening and closing the first, second, and third valves, the pipeline connecting the first resin decalcification tank 21 and the second decalcification tank 23 can be configured to be either open or closed. Similarly, the pipeline connecting the backup resin decalcification tank and the second decalcification tank 23 can also be configured to be either open or closed. For example, when the third valve is open, the first valve is open, and the second valve is closed, the pipeline connecting the first resin decalcification tank 21 and the second decalcification tank 23 is open, and the liquid in the second decalcification tank 23 can be discharged into the first resin decalcification tank 21. For example, when the third valve is open, the second valve is open, and the third valve is closed, the pipe connecting the resin decalcification standby tank and the second decalcification tank 23 is connected, and the liquid in the second decalcification tank 23 can be discharged into the resin decalcification standby tank.

[0053] In some examples, the leachate ammonia nitrogen treatment system in the slag heap may also include a fourth valve and a fifth valve. The fourth valve may be connected between the first resin decalcification tank 21 and the resin ammonia nitrogen removal device 30, and the fifth valve may be connected between the resin decalcification standby tank and the resin ammonia nitrogen removal device 30. Opening and closing the fourth valve controls the flow and blockage of the pipeline between the first resin decalcification tank 21 and the resin ammonia nitrogen removal device 30. Opening and closing the fifth valve controls the flow and blockage of the pipeline between the resin decalcification standby tank and the resin ammonia nitrogen removal device 30. For example, when the fourth valve is open, the pipeline between the first resin decalcification tank 21 and the resin ammonia nitrogen removal device 30 is open, and the aqueous solution in the first resin decalcification tank 21 can be discharged to the resin ammonia nitrogen removal device 30. For example, when the fourth valve is closed, the pipeline between the first resin decalcification tank 21 and the resin ammonia nitrogen removal device 30 is blocked, and the aqueous solution in the first resin decalcification tank 21 cannot be discharged to the resin ammonia nitrogen removal device 30.

[0054] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the resin ammonia nitrogen removal device 30 may include a second resin calcium removal tank 31 and a resin ammonia nitrogen removal tank 32. The inlet of the second resin calcium removal tank 31 is connected to the outlet of the first resin calcium removal tank 21, the outlet of the second resin calcium removal tank 31 is connected to the inlet of the resin ammonia nitrogen removal tank 32, and the outlet of the resin ammonia nitrogen removal tank 32 is connected to the acidity adjustment device 40.

[0055] In some embodiments of this utility model, such as Figure 1 and Figure 2As shown, the second resin calcium removal tank 31 and the resin ammonia nitrogen removal tank 32 can be connected by a water pump. The water pump can discharge the aqueous solution discharged from the second resin calcium removal tank 31 into the resin ammonia nitrogen removal tank 32.

[0056] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the inlet and outlet of the second resin calcium removal tank 31 can be connected to valves respectively. Opening and closing these valves controls the flow of solution into and out of the second resin calcium removal tank 31. Similarly, the inlet and outlet of the resin ammonia nitrogen removal tank 32 can be connected to valves respectively. Opening and closing these valves controls the flow of solution into and out of the resin ammonia nitrogen removal tank 32.

[0057] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the resin ammonia nitrogen removal device 30 may further include an online ammonia nitrogen detection device, which is connected to another outlet of the resin ammonia nitrogen removal tank 32 and is used to detect the ammonia nitrogen ion concentration in the aqueous solution of the resin ammonia nitrogen removal tank 32. By using the online ammonia nitrogen detection device, the ammonia nitrogen ion concentration in the aqueous solution of the resin ammonia nitrogen removal tank 32 can be detected, and when the ammonia nitrogen ion concentration in the aqueous solution meets the requirements, the aqueous solution in the resin ammonia nitrogen removal tank 32 is discharged to the acidity adjustment device 40 for further treatment.

[0058] In this embodiment of the invention, ammonia nitrogen removal resin can be added to the resin ammonia nitrogen removal tank 32 in advance. During leachate treatment, the ammonia nitrogen removal resin in the tank 32 can react with the discharged aqueous solution to induce ammonia nitrogen ion precipitation. After the ammonia nitrogen ion precipitation reaction is complete, the resulting aqueous solution is discharged to the acidity adjustment tank 41. In some examples, the ammonia nitrogen removal resin can be a weakly acidic cation exchange resin. After the ammonia nitrogen removal resin is saturated, it can be eluted with 5% dilute sulfuric acid. The resulting ammonium sulfate eluent can be further concentrated and reused.

[0059] In this embodiment of the invention, the ammonia nitrogen removal resin device 32 can be used to remove ammonia nitrogen ions from an aqueous solution and reduce the concentration of ammonia nitrogen ions in the aqueous solution.

[0060] In some embodiments of this utility model, such as Figure 1 and Figure 2As shown, the resin ammonia nitrogen removal device 30 may further include a resin ammonia nitrogen removal backup tank (not shown in the figure), which is connected in parallel with the resin ammonia nitrogen removal tank 32. The specific implementation of the parallel connection between the resin ammonia nitrogen removal backup tank and the resin ammonia nitrogen removal tank 32 can be the same as the parallel connection between the resin calcium removal backup tank and the first resin calcium removal tank 21. Therefore, the specific implementation of the parallel connection between the resin ammonia nitrogen removal backup tank and the resin ammonia nitrogen removal tank 32 will not be described in detail here.

[0061] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the acidity adjustment device 40 may include an acidity adjustment tank 41, the inlet of which is connected to the resin ammonia nitrogen removal device 30.

[0062] In this embodiment of the invention, the inlet of the acidity adjustment tank 41 can be connected to the outlet of the resin ammonia nitrogen removal tank 32 of the resin ammonia nitrogen removal device 30.

[0063] The acidity adjustment device 40 provided in this embodiment of the invention can adjust the pH value of the aqueous solution in the acidity adjustment tank 41 through the acidity adjustment process P4, so that the pH value of the aqueous solution in the acidity adjustment tank 41 can meet the discharge requirements. Specifically, alkali can be added to the acidity adjustment tank 41 so that the pH value of the aqueous solution in the acidity adjustment tank 41 can meet the external discharge standard of 6 to 9.

[0064] It should be noted that, in this embodiment of the utility model, the external drainage can be returned to the first resin calcium removal tank 21 and / or resin ammonia nitrogen removal tank 32 and other equipment in the slag yard leachate ammonia nitrogen treatment system, and used as washing water and dilution water for preparing dilute acid solutions.

[0065] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A system for treating ammonia nitrogen from leachate in a slag heap, characterized in that, include: A preliminary calcium removal device is used to perform the first calcium ion precipitation reaction of the leachate from the slag yard and obtain a first aqueous solution; A resin calcium removal device connected to the preliminary calcium removal device is used to perform a second calcium ion precipitation reaction of the first aqueous solution and obtain a second aqueous solution. A resin ammonia nitrogen removal device connected to the resin calcium removal device is used to carry out the ammonia nitrogen ion precipitation reaction of the second aqueous solution and obtain a third aqueous solution; An acidity adjustment device is connected to the resin ammonia nitrogen removal device. The acidity adjustment device is used to adjust the acidity of the third aqueous solution and obtain an aqueous solution that meets the external drainage standards.

2. The system according to claim 1, characterized in that, The preliminary calcium removal device includes a first calcium removal tank, the outlet of which is connected to the resin calcium removal device.

3. The system of claim 2, wherein, The preliminary calcium removal device also includes a solid-liquid separation device, the inlet of which is connected to the first calcium removal tank, and the outlet of which is connected to the resin calcium removal device.

4. The system of claim 2, wherein, The resin calcium removal device includes a first resin calcium removal tank, the inlet of the first resin calcium removal tank is connected to the outlet of the first resin calcium removal tank, and the outlet of the first resin calcium removal tank is connected to the resin ammonia nitrogen removal device.

5. The system of claim 4, wherein, The resin calcium removal device also includes a backup resin calcium removal tank, which is connected in parallel with the first resin calcium removal tank.

6. The system of claim 4, wherein, The resin calcium removal device also includes a filtration device, the inlet of which is connected to the outlet of the first calcium removal tank, and the outlet of which is connected to the inlet of the first resin calcium removal tank.

7. The system of claim 6, wherein, The resin calcium removal device further includes a second calcium removal tank, the inlet of which is connected to the outlet of the filter device, and the outlet of which is connected to the inlet of the first resin calcium removal tank.

8. The system of claim 6, wherein, The resin ammonia nitrogen removal device includes a second resin calcium removal tank and a resin ammonia nitrogen removal tank. The inlet of the second resin calcium removal tank is connected to the outlet of the first resin calcium removal tank, the outlet of the second resin calcium removal tank is connected to the inlet of the resin ammonia nitrogen removal tank, and the outlet of the resin ammonia nitrogen removal tank is connected to the acidity adjustment device.

9. The system of claim 8, wherein, The resin ammonia nitrogen removal device also includes a resin ammonia nitrogen removal backup tank, which is connected in parallel with the resin ammonia nitrogen removal tank.

10. The system according to claim 1, characterized in that, The acidity adjustment device includes an acidity adjustment tank, the inlet of which is connected to the resin ammonia nitrogen removal device.

Images