Iron-containing waste acid recycling device and wastewater treatment equipment

Abstract

The utility model provides an iron-containing waste acid recycling device and wastewater treatment equipment. The iron-containing waste acid recycling device comprises an iron-containing waste acid storage pool, a chromium-containing waste water containing pool, a chromium breaking reaction pool, a comprehensive reaction pool, a sedimentation pool, a filter screen and a flow adjusting assembly, and an outflow opening of the iron-containing waste acid storage pool is communicated with the chromium breaking reaction pool through a first conveying pipeline; the chromium-containing wastewater containing tank is communicated with the chromium breaking reaction tank through a second conveying pipeline, and the chromium breaking reaction tank, the comprehensive reaction tank and the sedimentation tank are sequentially communicated; the flow adjusting assembly comprises a flow adjusting valve arranged on the first conveying pipeline, the flow adjusting valve is used for adjusting the conveying flow of the iron-containing waste acid, and the filter screen is arranged at an outflow opening of the iron-containing waste acid storage pool. According to the iron-containing waste acid recycling device, part of impurities in the iron-containing waste acid are removed through the filter screen, and the amount of the iron-containing waste acid required by the chromium-containing waste water during reaction is controlled through the flow regulating valve, so that sufficient reaction is ensured, and the reasonable utilization of the iron-containing waste acid is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of waste acid recovery and utilization, and in particular to an iron-containing waste acid recovery and utilization device and wastewater treatment equipment. Background Art

[0002] At present, with the continuous development of industrial production, the amount of iron-containing waste acid generated is continuously increasing. Iron-containing waste acid mainly comes from industrial fields such as steel manufacturing and electroplating. If it is not properly treated and directly discharged, it will cause serious pollution to the environment.

[0003] For example, Chinese patent number CN101475274A discloses a comprehensive electroplating wastewater treatment process, which uses waste acid instead of acids to treat chromium-containing wastewater.

[0004] However, the prior art does not directly use the iron-containing waste acid for the treatment of chromium-containing wastewater, resulting in waste of the iron-containing waste acid and increasing the cost of treating the chromium-containing wastewater. Utility Model Content

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an iron-containing waste acid recovery and utilization device and wastewater treatment equipment that can rationally utilize iron-containing waste acid, thereby reducing the cost of treating chromium-containing wastewater.

[0006] The purpose of this disclosure is achieved through the following technical solutions:

[0007] A device for recycling iron-containing waste acid comprises an iron-containing waste acid storage tank, a chromium-containing wastewater storage tank and a chromium-breaking reaction tank, wherein the outlet of the iron-containing waste acid storage tank is connected to the chromium-breaking reaction tank through a first delivery pipe, and the chromium-containing wastewater storage tank is connected to the chromium-breaking reaction tank through a second delivery pipe.

[0008] The iron-containing waste acid recovery and utilization device also includes a comprehensive reaction tank, a sedimentation tank, a filter screen and a flow regulating component. The chromium crushing reaction tank, the comprehensive reaction tank and the sedimentation tank are connected in sequence; the flow regulating component includes a flow regulating valve arranged on the first conveying pipeline, and the flow regulating valve is used to adjust the flow rate of the iron-containing waste acid. The filter screen is arranged at the outflow outlet of the iron-containing waste acid storage tank.

[0009] In one embodiment, the iron-containing waste acid recovery and utilization device further includes an anti-corrosion coating, which is disposed on the inner surface of the iron-containing waste acid storage tank.

[0010] In one embodiment, the flow regulating component further includes a waste acid extraction pump, and the waste acid extraction pump is provided on the first delivery pipeline between the outflow port and the flow regulating valve.

[0011] In one embodiment, the iron-containing waste acid recycling device further includes a discharge assembly, which is connected to the comprehensive reaction tank and is used to discharge reaction precipitates.

[0012] In one embodiment, the iron-containing waste acid recycling device further includes a feeding assembly, which includes a lime feeding pipe, a liquid caustic soda feeding pipe, and a PAM feeding pipe; the comprehensive reaction tank includes a first reaction tank, a second reaction tank, and a third reaction tank that are connected in sequence, the lime feeding pipe is connected to the first reaction tank, the liquid caustic soda feeding pipe is connected to the second reaction tank, and the PAM feeding pipe is connected to the third reaction tank.

[0013] In one embodiment, the discharge assembly includes a first sludge discharge channel, a second sludge discharge channel, and a third sludge discharge channel. The first reaction tank is connected to the first sludge discharge channel, the second reaction tank is connected to the second sludge discharge channel, and the third reaction tank is connected to the third sludge discharge channel.

[0014] In one embodiment, the first reaction tank and the second reaction tank are both equipped with pH measuring instruments.

[0015] In one embodiment, the third reaction tank is connected to the sedimentation tank, and a lift pump is provided on the connecting pipe between the third reaction tank and the sedimentation tank.

[0016] In one embodiment, a purification tank and a sedimentation tank are formed in the sedimentation tank and are connected to each other. The purification tank is connected to the third reaction tank, and the sedimentation tank is provided with a sludge discharge pipe for discharging the precipitates in the sedimentation tank.

[0017] In one embodiment, the iron-containing waste acid recycling device further includes a drain pipe and a drain tank, and the drain tank is connected to the purification tank through the drain pipe.

[0018] A wastewater treatment device includes the iron-containing waste acid recycling device described in any of the above embodiments.

[0019] Compared with the prior art, the present disclosure has at least the following advantages:

[0020] 1) The iron-containing waste acid recycling device of the present disclosure has an iron-containing waste acid storage tank and a chromium-containing wastewater storage tank both connected to a chromium-breaking reaction tank, so that the iron-containing waste acid flows into the chromium-breaking reaction tank through a first conveying pipeline, and the chromium-containing wastewater flows into the chromium-breaking reaction tank through a second conveying pipeline, ensuring that a chemical reaction can occur between the iron-containing waste acid and the chromium-containing wastewater in the chromium-breaking reaction tank. Since a filter screen is provided at the outflow port of the iron-containing waste acid storage tank, part of the impurities can be removed when the iron-containing waste acid flows into the chromium-breaking reaction tank, reducing the influence of impurities on the chemical reaction between the iron-containing waste acid and the chromium-containing wastewater. Also, since a flow regulating valve is provided on the first conveying pipeline, the flow regulating valve can adjust the size of the valve according to the amount of iron-containing waste acid required by the chromium-containing wastewater, thereby conveying the required amount of iron-containing waste acid, further ensuring that the iron-containing waste acid and the chromium-containing wastewater react fully, improving the rational utilization of the iron-containing waste acid, ensuring the effectiveness of the iron-containing waste acid in reducing hexavalent chromium ions in the chromium-containing wastewater, and thus reducing the treatment cost of the chromium-containing wastewater.

[0021] 2) In the iron-containing waste acid recycling device of the present disclosure, since the chromium-breaking reaction tank, the comprehensive reaction tank, and the sedimentation tank are connected in sequence, the hexavalent chromium ions in the chromium-containing wastewater are reduced to trivalent chromium ions in the chromium-breaking reaction tank and then flow into the comprehensive reaction tank. An alkaline solution is added through the comprehensive reaction tank, so that the trivalent chromium ions produce precipitates after the neutralization reaction to achieve the precipitation of trivalent chromium ions in the chromium-containing wastewater. The treated wastewater then flows into the sedimentation tank to remove other solid particles, further purifying the water quality and making the wastewater meet the discharge standard, thereby realizing the effective treatment of the chromium-containing wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present disclosure, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic structural diagram of the iron-containing waste acid recycling device according to an embodiment of the present disclosure.

[0024] Reference numerals: 10, iron-containing waste acid recycling device; 100, iron-containing waste acid storage tank; 110, first conveying pipeline; 120, filter screen; 200, chromium-containing wastewater holding tank; 210, second conveying pipeline; 300, chromium-breaking reaction tank; 400, comprehensive reaction tank; 410, first reaction tank; 420, second reaction tank; 430, third reaction tank; 431, lift pump; 500, sedimentation tank; 510, purification tank; 520, sedimentation tank; 521, sludge discharge pipeline; 600, flow regulation assembly; 610, flow regulation valve; 620, waste acid extraction pump; 700, discharge assembly; 710, first sludge discharge channel; 720, second sludge discharge channel; 730, third sludge discharge channel; 800, feeding assembly; 810, lime feeding pipe; 820, liquid caustic soda feeding pipe; 830, PAM feeding pipe; 900, drainage tank; 910, drain pipe. Detailed implementation manners

[0025] To facilitate the understanding of the present disclosure, the present disclosure will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present disclosure are shown in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the understanding of the disclosure content of the present disclosure is more thorough and comprehensive.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present disclosure belongs. The terms used in the description of the present disclosure in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0028] To better understand the technical solutions and beneficial effects of the present disclosure, the present disclosure will be further described in detail below with specific embodiments:

[0029] As Figure 1As shown in the figure, the iron-containing waste acid recycling device 10 of an embodiment includes an iron-containing waste acid storage tank 100, a chromium-containing wastewater storage tank 200, a chromium-breaking reaction tank 300, a comprehensive reaction tank 400, a sedimentation tank 500, a filter screen 120 and a flow rate regulating assembly 600; the outflow port of the iron-containing waste acid storage tank 100 is connected to the chromium-breaking reaction tank 300 through a first conveying pipeline 110, the chromium-containing wastewater storage tank 200 is connected to the chromium-breaking reaction tank 300 through a second conveying pipeline 210, and the chromium-breaking reaction tank 300, the comprehensive reaction tank 400 and the sedimentation tank 500 are connected in sequence; the flow rate regulating assembly 600 includes a flow rate regulating valve 610 provided on the first conveying pipeline 110, and the flow rate regulating valve 610 is used to regulate the flow rate of the iron-containing waste acid conveyance, and the filter screen 120 is arranged at the outflow port of the iron-containing waste acid storage tank 100.

[0030] It can be understood that by connecting both the iron-containing waste acid storage tank 100 and the chromium-containing wastewater storage tank 200 to the chromium-breaking reaction tank 300, the iron-containing waste acid flows into the chromium-breaking reaction tank 300 through the first conveying pipeline 110, and the chromium-containing wastewater flows into the chromium-breaking reaction tank 300 through the second conveying pipeline 210, ensuring that a chemical reaction can occur between the iron-containing waste acid and the chromium-containing wastewater in the chromium-breaking reaction tank 300; since the filter screen 120 is arranged at the outflow port of the iron-containing waste acid storage tank 100, part of the impurities can be removed when the iron-containing waste acid flows into the chromium-breaking reaction tank 300, reducing the influence of the impurities on the chemical reaction between the iron-containing waste acid and the chromium-containing wastewater; and because the flow rate regulating valve 610 is provided on the first conveying pipeline 110, the flow rate regulating valve 610 can adjust the size of the valve according to the amount of iron-containing waste acid required by the chromium-containing wastewater, so as to convey the required iron-containing waste acid, thereby ensuring the full reaction between the iron-containing waste acid and the chromium-containing wastewater, improving the rational utilization of the iron-containing waste acid, ensuring the effectiveness of the iron-containing waste acid in reducing hexavalent chromium ions in the chromium-containing wastewater, and thus reducing the treatment cost of the chromium-containing wastewater.

[0031] It can also be understood that since the chromium-breaking reaction tank 300, the comprehensive reaction tank 400 and the sedimentation tank 500 are connected in sequence, the hexavalent chromium ions in the chromium-containing wastewater are reduced to trivalent chromium ions in the chromium-breaking reaction tank 300 and then flow into the comprehensive reaction tank 400. By adding an alkaline solution to the comprehensive reaction tank 400, the trivalent chromium ions produce precipitates after the neutralization reaction, so as to realize the precipitation of trivalent chromium ions in the chromium-containing wastewater. The treated wastewater then flows into the sedimentation tank 500 to remove other solid particles, further purifying the water quality and making the wastewater reach the discharge standard, thereby realizing the effective treatment of the chromium-containing wastewater.

[0032] In one embodiment, the iron-containing waste acid recycling device 10 further includes an anti-corrosion coating (not shown in the figure), and the anti-corrosion coating is disposed on the inner surface of the iron-containing waste acid storage tank 100. In this embodiment, since the iron-containing waste acid has certain corrosiveness, the iron-containing waste acid needs to be stored in the iron-containing waste acid storage tank 100. By providing the anti-corrosion coating on the inner surface of the iron-containing waste acid storage tank 100, the iron-containing waste acid storage tank 100 is reduced from being overly corroded, thereby ensuring the iron-containing waste acid recycling effect.

[0033] In one embodiment, the flow rate regulating assembly 600 further includes a waste acid extraction pump 620, and the waste acid extraction pump 620 is disposed on the first conveying pipeline 110 between the outflow port and the flow rate regulating valve 610. In this embodiment, since the waste acid extraction pump 620 is provided on the first conveying pipeline 110 between the outflow port of the iron-containing waste acid storage tank 100 and the flow rate regulating valve 610, the added waste acid extraction pump 620 effectively controls the amount of the required iron-containing waste acid to be extracted by opening and closing, ensuring the timely conveyance of the iron-containing waste acid, thereby ensuring the effective reaction between the iron-containing waste acid and the chromium-containing wastewater.

[0034] In one embodiment, the iron-containing waste acid recycling device 10 further includes a discharge assembly 700, and the discharge assembly 700 is communicated with the comprehensive reaction tank 400. The discharge assembly 700 is used to discharge the reaction precipitate. In this embodiment, since the comprehensive reaction tank 400 is communicated with the discharge assembly 700, after the trivalent chromium ions react in the comprehensive reaction tank 400, the trivalent chromium ions combine with hydroxide ions to form a precipitate, and the formed precipitate is discharged through the discharge assembly 700, preventing the precipitate from accumulating inside the comprehensive reaction tank 400.

[0035] As Figure 1 shown, in one embodiment, the iron-containing waste acid recycling device 10 further includes a feeding assembly 800. The feeding assembly 800 includes a lime feeding pipe 810, a liquid caustic soda feeding pipe 820, and a PAM feeding pipe 830. The comprehensive reaction tank 400 includes a first reaction tank 410, a second reaction tank 420, and a third reaction tank 430 that are sequentially communicated. The lime feeding pipe 810 is communicated with the first reaction tank 410, the liquid caustic soda feeding pipe 820 is communicated with the second reaction tank 420, and the PAM feeding pipe 830 is communicated with the third reaction tank 430. In this embodiment, the comprehensive reaction tank 400 is divided into a first reaction tank 410, a second reaction tank 420, and a third reaction tank 430 that are sequentially communicated, enabling the reaction to proceed in stages, which is conducive to gradually occurring reactions, more fully neutralizing the impurities in the chromium-containing wastewater, promoting the precipitation and separation of trivalent chromium ions, improving the recycling of the iron-containing waste acid and effectively treating the chromium-containing wastewater, thereby reducing the discharge and treatment cost of the iron-containing waste acid, and further improving the utilization rate of resources, achieving the effect of treating waste with waste.

[0036] As Figure 1As shown, in one embodiment, the discharge assembly 700 includes a first sludge discharge channel 710, a second sludge discharge channel 720, and a third sludge discharge channel 730. The first reaction tank 410 communicates with the first sludge discharge channel 710, the second reaction tank 420 communicates with the second sludge discharge channel 720, and the third reaction tank 430 communicates with the third sludge discharge channel 730. In this embodiment, during the treatment process of chromium-containing wastewater, the trivalent chromium ions generated by reduction in the chromium-breaking reaction tank 300 sequentially pass through the first reaction tank 410 and the second reaction tank 420, and chromium hydroxide precipitates are generated in the first reaction tank 410 and the second reaction tank 420. The generated precipitates are discharged through the first sludge discharge channel 710 and the second sludge discharge channel 720 in sequence. The wastewater passing through the first reaction tank 410 and the second reaction tank 420 then passes through the third reaction tank 430. By adding the flocculant PAM, other solid particles in the third reaction tank 430 are adsorbed onto the PAM molecules and aggregated into larger flocs, which are discharged from the third sludge discharge channel 730. By adding the first sludge discharge channel 710, the second sludge discharge channel 720, and the third sludge discharge channel 730, the precipitates inside the comprehensive reaction tank 400 are effectively removed, preventing the accumulation of precipitates and thus affecting the wastewater treatment effect.

[0037] In one embodiment, both the first reaction tank 410 and the second reaction tank 420 are provided with pH measuring instruments (not shown in the figure). When lime is added to the first reaction tank 410, the pH measuring instrument can monitor the pH value of the solution in the first reaction tank 410, thereby adjusting the amount of lime added. When caustic soda is added to the second reaction tank 420, the pH measuring instrument can adjust the amount of caustic soda added. In this embodiment, the pH value of the first reaction tank 410 is 4 - 5, and the pH value of the second reaction tank 420 is 7 - 8.

[0038] As Figure 1 shown, in one embodiment, the third reaction tank 430 communicates with the sedimentation tank 500, and a lift pump is provided in the connecting pipeline between the third reaction tank 430 and the sedimentation tank 500 to ensure that the wastewater treated by the first reaction tank 410, the second reaction tank 420, and the third reaction tank 430 can enter the sedimentation tank 500 through the lift pump, further ensuring that other solid particles in the wastewater can precipitate, ensuring that the wastewater meets the discharge standard, and thus realizing the effective treatment of chromium-containing wastewater.

[0039] As Figure 1As shown, in one embodiment, a purification tank 510 and a sedimentation tank 520 are formed in a sedimentation tank 500 and are in communication with each other. The purification tank 510 is in communication with a third reaction tank 430. The sedimentation tank 520 is provided with a sludge discharge pipe 521 for discharging the sediment in the sedimentation tank 520. In this embodiment, since the purification tank 510 and the sedimentation tank 520 are formed in the sedimentation tank 500 and are in communication with each other, the wastewater treated by the third reaction tank 430 flows into the sedimentation tank 500, so that other sediments in the sedimentation tank 500 fall into the sedimentation tank 520, and the sediment is discharged through the sludge discharge pipe 521, further improving the water quality after wastewater treatment.

[0040] As Figure 1 shown, in one embodiment, the iron-containing waste acid recycling device 10 further includes a drain pipe 910 and a drainage tank 900. The drainage tank 900 is in communication with the purification tank 510 through the drain pipe 910, so that the purified wastewater meets the discharge standard, and the treated wastewater is discharged into the drainage tank 900 through the drain pipe 910 to achieve the effect of wastewater treatment.

[0041] The present disclosure also provides a wastewater treatment device, including the iron-containing waste acid recycling device 10 described in any of the above embodiments.

[0042] Compared with the prior art, the present disclosure has at least the following advantages:

[0043] 1) In the iron-containing waste acid recycling device 10 of the present disclosure, the iron-containing waste acid storage tank 100 and the chromium-containing wastewater storage tank 200 are both in communication with the chromium-breaking reaction tank 300, so that the iron-containing waste acid flows into the chromium-breaking reaction tank 300 through the first conveying pipe 110, and the chromium-containing wastewater flows into the chromium-breaking reaction tank 300 through the second conveying pipe 210, ensuring that the iron-containing waste acid and the chromium-containing wastewater can undergo a chemical reaction in the chromium-breaking reaction tank 300; since the filter screen 120 is provided at the outflow port of the iron-containing waste acid storage tank 100, part of the impurities can be removed when the iron-containing waste acid flows into the chromium-breaking reaction tank 300, reducing the influence of the impurities on the chemical reaction between the iron-containing waste acid and the chromium-containing wastewater; and since a flow regulating valve 610 is provided on the first conveying pipe 110, the flow regulating valve 610 can adjust the size of the valve according to the amount of iron-containing waste acid required by the chromium-containing wastewater, so as to convey the required iron-containing waste acid, thereby ensuring that the iron-containing waste acid and the chromium-containing wastewater react fully, improving the reasonable utilization of the iron-containing waste acid, ensuring the effectiveness of the iron-containing waste acid in reducing hexavalent chromium ions in the chromium-containing wastewater, and thus reducing the treatment cost of the chromium-containing wastewater.

[0044] 2) In the iron-containing waste acid recycling device 10 of the present disclosure, since the chromium-breaking reaction tank 300, the comprehensive reaction tank 400, and the sedimentation tank 500 are connected in sequence, the hexavalent chromium ions in the chromium-containing wastewater are reduced to trivalent chromium ions in the chromium-breaking reaction tank 300 and then flow into the comprehensive reaction tank 400. An alkaline solution is added through the comprehensive reaction tank 400 to cause the trivalent chromium ions to produce precipitates after the neutralization reaction, so as to achieve the precipitation of the trivalent chromium ions in the chromium-containing wastewater. The treated wastewater then flows into the sedimentation tank 500 to remove other solid particles, further purifying the water quality and making the wastewater meet the discharge standard, thereby realizing the effective treatment of the chromium-containing wastewater.

[0045] The above-described embodiments only represent several implementation manners of the present disclosure. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present disclosure, several modifications and improvements can still be made, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure patent shall be subject to the appended claims.

Claims

1. An iron-containing waste acid recycling device, comprising an iron-containing waste acid storage tank, a chromium-containing wastewater holding tank and a chromium-breaking reaction tank. The outlet of the iron-containing waste acid storage tank is connected to the chromium-breaking reaction tank through a first conveying pipeline, and the chromium-containing wastewater holding tank is connected to the chromium-breaking reaction tank through a second conveying pipeline. It is characterized in that the iron-containing waste acid recycling device further comprises a comprehensive reaction tank, a sedimentation tank, a filter screen and a flow rate regulating assembly. The chromium-breaking reaction tank, the comprehensive reaction tank and the sedimentation tank are connected in sequence. The flow rate regulating assembly includes a flow rate regulating valve arranged on the first conveying pipeline, and the flow rate regulating valve is used to regulate the flow rate of the iron-containing waste acid conveyed. The filter screen is arranged at the outlet of the iron-containing waste acid storage tank.

2. The iron-containing waste acid recycling device according to claim 1, characterized in that, the iron-containing waste acid recycling device further comprises an anti-corrosion coating, and the anti-corrosion coating is arranged on the inner surface of the iron-containing waste acid storage tank; and / or the flow rate regulating assembly further comprises a waste acid extraction pump, and the waste acid extraction pump is arranged on the first conveying pipeline between the outlet and the flow rate regulating valve.

3. The iron-containing waste acid recycling device according to claim 1, characterized in that, the iron-containing waste acid recycling device further comprises a discharge assembly, and the discharge assembly is connected to the comprehensive reaction tank and is used to discharge reaction precipitates.

4. The iron-containing waste acid recycling device according to claim 1, characterized in that, the iron-containing waste acid recycling device further comprises a feeding assembly, and the feeding assembly includes a lime feeding pipe, a liquid caustic soda feeding pipe and a PAM feeding pipe. The comprehensive reaction tank includes a first reaction tank, a second reaction tank and a third reaction tank connected in sequence. The lime feeding pipe is connected to the first reaction tank, the liquid caustic soda feeding pipe is connected to the second reaction tank, and the PAM feeding pipe is connected to the third reaction tank.

5. The iron-containing waste acid recycling device according to claim 4, wherein the discharge assembly includes a first sludge discharge channel, a second sludge discharge channel and a third sludge discharge channel. The first reaction tank is connected to the first sludge discharge channel, the second reaction tank is connected to the second sludge discharge channel, and the third reaction tank is connected to the third sludge discharge channel.

6. The iron-containing waste acid recycling device according to claim 4, wherein The first reaction tank and the second reaction tank are both provided with pH measuring instruments.

7. The iron-containing waste acid recycling device according to claim 4, wherein, The third reaction tank is connected to the sedimentation tank, and a lift pump is arranged on the connecting pipeline between the third reaction tank and the sedimentation tank.

8. The iron-containing waste acid recycling device according to claim 4, characterized in that, A purification tank and a sedimentation tank are formed in the sedimentation tank and are connected to each other. The purification tank is connected to the third reaction tank, and the sedimentation tank is provided with a sludge discharge pipeline for discharging the precipitates in the sedimentation tank.

9. The iron-containing waste acid recycling device according to claim 8, wherein, the iron-containing waste acid recycling device further comprises a drain pipe and a drain tank, and the drain tank is connected to the purification tank through the drain pipe.

10. A wastewater treatment device, characterized in that, An iron-containing waste acid recycling device according to any one of claims 1 to 9.

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