Comprehensive disposal system for recycling and utilizing waste concentrated sulfuric acid and waste iron filings

Abstract

The invention discloses a comprehensive disposal system for recycling and utilizing waste concentrated sulfuric acid and waste iron filings, wherein an industrial wastewater storage tank, a sequencing batch reaction tank, a Fenton reaction tank, and an intermediate water tank are connected in sequence, and an intermediate water tank and a waste concentrated sulfuric acid storage tank are connected to a sulfuric acid dilution tank, and a sulfuric acid pump and a wastewater pump are provided between the waste concentrated sulfuric acid storage tank, the intermediate water tank, and the sulfuric acid dilution tank, and an online monitoring sulfate concentration meter is provided in the waste concentrated sulfuric acid storage tank, the sulfuric acid dilution tank and the waste iron filings storage tank are connected to a ferrous sulfate reaction tank, the ferrous sulfate reaction tank is connected to an exhaust gas alkali scrubber and a Fenton reaction tank, and a wastewater monitor is provided in the Fenton reaction tank, and a first dosing pump is provided between the ferrous sulfate reaction tank and the Fenton reaction tank, and an online monitoring sulfate concentration meter, a sulfuric acid pump, a wastewater pump, a wastewater monitor, and a first dosing pump are connected to a PLC control device, and the Fenton reaction tank is connected to a sludge tank. The present invention can realize waste resource utilization and waste treatment, reduce the cost of industrial wastewater purification and disposal, and avoid waste of resources.

Description

Technical Field

[0001] The invention relates to a comprehensive disposal system for recycling and utilizing waste concentrated sulfuric acid and waste iron filings. Background Art

[0002] With the rise of the electronics industry, the pickling process in the production of electronic products will produce a large amount of waste sulfuric acid, and the amount is huge. The amount of HW34 in the industrial wastewater disposal category is also far greater than the output of other categories of wastewater. The waste alkali liquid produced in the industry can be used for acid-base neutralization, but it is far from meeting the acid-base neutralization demand for waste acid. The use of liquid alkali or lime to neutralize the waste acid will not only cause a waste of resources, but also produce a large amount of secondary hazardous waste sludge, which requires secondary treatment. Therefore, finding a resource recovery and disposal of waste sulfuric acid is a more promising disposal model.

[0003] After the waste cutting fluid generated in the production process of the machining industry is cooled, a large amount of waste iron filings will be produced. These iron filings must be incinerated by qualified incineration companies as hazardous waste. Iron filings not only have low calorific value, but also have an ash content of more than 90%. After incineration and oxidation, they become iron oxide and are finally landfilled as incineration slag. The incineration of such iron filings not only wastes iron resources, but also produces secondary hazardous waste. Therefore, it is a trend to find resource utilization of waste iron filings and treat waste with waste. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a comprehensive disposal system for the resource recovery and utilization of waste concentrated sulfuric acid and waste iron filings, aiming to solve the technical problems of waste concentrated sulfuric acid and waste iron filings resources, high industrial wastewater disposal cost and low disposal efficiency in the prior art.

[0005] The technical scheme of the present invention is: a comprehensive disposal system for the resource recovery and utilization of waste concentrated sulfuric acid and waste iron scraps, comprising an industrial wastewater storage tank, a sequencing batch reaction tank, a Fenton reaction tank, an intermediate water tank, a waste concentrated sulfuric acid storage tank, a sulfuric acid dilution tank, a waste iron scrap storage tank, a ferrous sulfate reaction tank, an exhaust gas alkali scrubbing tower, a sludge tank, and a PLC control device, wherein the industrial wastewater storage tank, the sequencing batch reaction tank, the Fenton reaction tank, and the intermediate water tank are connected in sequence, the waste concentrated sulfuric acid storage tank and the intermediate water tank are respectively connected to the sulfuric acid dilution tank, and the waste concentrated sulfuric acid storage tank, the intermediate water tank and the sulfuric acid dilution tank are connected to each other. A sulfuric acid pump and a wastewater pump are respectively provided. An online sulfate concentration monitoring instrument is provided in the waste concentrated sulfuric acid storage tank. The online sulfate concentration monitoring instrument, the sulfuric acid pump and the wastewater pump are respectively connected to the PLC control device. The PLC control device can control the sulfuric acid pump and the wastewater pump according to the sulfuric acid concentration detected by the online sulfate concentration monitoring instrument to pump the required amount of sulfuric acid and wastewater into the sulfuric acid dilution tank for dilution reaction; the sulfuric acid dilution tank and the scrap iron storage tank are respectively connected to the ferrous sulfate reaction tank, and the ferrous sulfate reaction tank is respectively connected to the exhaust gas alkali scrubber and the Fenton reaction tank The waste dilute sulfuric acid and waste iron filings in the sulfuric acid dilution tank and the waste iron filings storage tank are respectively introduced into the ferrous sulfate reaction tank for reaction, and the gas and ferrous sulfate solution generated by the reaction are respectively introduced into the waste gas alkali washing tower and the Fenton reaction tank; the gas includes hydrogen sulfide gas, and the waste gas alkali washing tower is provided with a sodium hydroxide solution. After the gas is introduced into the waste gas alkali washing tower, a sodium sulfide solution can be generated. The waste gas alkali washing tower is connected to the sequencing batch reaction tank for introducing the generated sodium sulfide solution into the sequencing batch reaction tank to coagulate and flocculate the industrial wastewater; the industrial wastewater after coagulation and flocculation in the sequencing batch reaction tank Water is passed into the Fenton reaction tank, a wastewater monitor for monitoring various indicators of wastewater is provided in the Fenton reaction tank, a first dosing pump is provided between the ferrous sulfate reaction tank and the Fenton reaction tank, the wastewater monitor and the first dosing pump are respectively connected to the PLC control device, and the PLC control device can control the first dosing pump to pump a required amount of ferrous sulfate solution into the Fenton reaction tank for reaction according to the monitoring data of the wastewater monitor, the Fenton reaction tank is also connected to the sludge tank, and the effluent after the reaction is discharged to the intermediate water tank, and the sludge is discharged to the sludge tank.

[0006] Furthermore, the sulfuric acid dilution tank in the present invention is connected to a condensed water circulation system, the sulfuric acid dilution tank has an outer shell on the outside, a cavity is formed between the sulfuric acid dilution tank and the outer shell, and the condensed water circulation system is used to transport condensed water into the cavity to cool the sulfuric acid dilution tank.

[0007] Furthermore, the condensate water circulation system in the present invention comprises a condensate water treatment box, the condensate water treatment box is connected to the clamping cavity, and the condensate water treatment box is connected to the PLC control device.

[0008] Furthermore, a thermometer connected to the PLC control device is provided in the sulfuric acid dilution tank of the present invention, and the PLC control device can control the condensed water cooling temperature set in the condensed water treatment box according to the temperature in the sulfuric acid dilution tank detected by the thermometer.

[0009] Furthermore, the gas generated by the reaction in the ferrous sulfate reaction tank of the present invention also includes hydrogen, and the waste gas alkali scrubbing tower is also connected to a hydrogen collection tank for collecting hydrogen.

[0010] Furthermore, the Fenton reaction tank in the present invention is connected to a hydrogen peroxide dosing box, a second dosing pump is provided between the hydrogen peroxide dosing box and the Fenton reaction tank, the second dosing pump is connected to the PLC control device, and the PLC control device can control the second dosing pump to pump the required amount of hydrogen peroxide into the Fenton reaction tank for reaction according to the monitoring data of the wastewater monitor.

[0011] Furthermore, the Fenton reaction tank in the present invention is connected to a pH adjusting dosing box, a third dosing pump is provided between the pH adjusting dosing box and the Fenton reaction tank, a pH meter is provided in the Fenton reaction tank, the third dosing pump and the pH meter are respectively connected to the PLC control device, and the PLC control device can control the third dosing pump to pump the required amount of pH adjuster into the Fenton reaction tank to adjust the pH of the wastewater to between 8 and 9 according to the pH value of the wastewater detected by the pH meter.

[0012] Furthermore, the intermediate water tank in the present invention is also connected to a main regulating tank and a biochemical system in sequence. Most of the water in the intermediate water tank enters the main regulating tank and then enters the biochemical system for biochemical treatment. Qualified effluent is finally discharged into the municipal pipe network.

[0013] Furthermore, the sulfuric acid dilution tank, ferrous sulfate reaction tank, Fenton reaction tank and sequencing batch reaction tank described in the present invention are all provided with stirring devices.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1) The disposal system of the present invention reasonably utilizes waste concentrated sulfuric acid and waste iron filings, and uses the ferrous sulfate solution generated by the reaction of diluted waste concentrated sulfuric acid and waste iron filings as a reagent for the Fenton process of industrial wastewater. The system can not only safely recover waste concentrated sulfuric acid and waste iron filings, but also meet the reagent requirements of the Fenton process of industrial wastewater, purify and dispose of industrial wastewater, achieve the purpose of waste resource utilization, and achieve the purpose of treating waste with waste, which is beneficial to reducing the cost of industrial wastewater treatment and avoiding waste of resources.

[0016] 2) The treatment system of the present invention has low operating costs, a high degree of automation and intelligence, produces a small amount of secondary sludge, can fully utilize sulfur and iron resources, treat industrial wastewater to meet effluent requirements, and has a significant treatment effect.

[0017] 3) The hydrogen generated during the operation of the disposal system of the present invention is collected in a hydrogen collection tank and can be used as clean energy to maximize resource utilization.

[0018] 4) In the present invention, the specially designed condensed water circulation system can effectively cool the sulfuric acid dilution tank, absorb a large amount of heat released during the dilution of the waste concentrated sulfuric acid, and ensure the safe progress of the reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the system structure of the present invention;

[0020] Figure 2 It is a system framework diagram of the present invention.

[0021] Among them: 1. Industrial wastewater storage tank; 2. Sequencing batch reaction tank; 3. Fenton reaction tank; 3a. Wastewater monitor; 4. Intermediate water tank; 5. Waste concentrated sulfuric acid storage tank; 5a. Online monitoring sulfate concentration meter; 6. Sulfuric acid dilution tank; 7. Scrap iron storage tank; 8. Ferrous sulfate reaction tank; 9. Waste gas alkali washing tower; 10. Sludge tank; 11. Condensate treatment box; 12. Thermometer; 13. Hydrogen collection tank; 14. Hydrogen peroxide dosing box; 15. pH adjustment dosing box; 16. pH meter; 17. Total adjustment tank; 18. Biochemical system; a1. Sulfuric acid pump; a2. Wastewater pump; a3. First dosing pump; a4. Second dosing pump; a5. Third dosing pump. DETAILED DESCRIPTION

[0022] The specific implementation modes of the present invention are described in detail below with reference to the accompanying drawings.

[0023] Example:

[0024] As shown in the accompanying drawings, a specific implementation method of a comprehensive disposal system for resource recovery and utilization of waste concentrated sulfuric acid and waste iron filings of the present invention is shown. The system mainly includes an industrial wastewater storage tank 1, a sequencing batch reaction tank 2, a Fenton reaction tank 3, an intermediate water tank 4, a waste concentrated sulfuric acid storage tank 5, a sulfuric acid dilution tank 6, a waste iron filings storage tank 7, a ferrous sulfate reaction tank 8, an exhaust gas alkali washing tower 9, a sludge tank 10, and a PLC control device.

[0025] An industrial wastewater storage tank 1, a sequencing batch reaction tank 2, a Fenton reaction tank 3, and an intermediate water tank 4 are connected in sequence, a waste concentrated sulfuric acid storage tank 5 and an intermediate water tank 4 are respectively connected to a sulfuric acid dilution tank 6, a sulfuric acid pump a1 and a wastewater pump a2 are respectively provided between the waste concentrated sulfuric acid storage tank 5, the intermediate water tank 4 and the sulfuric acid dilution tank 6, and an online sulfate concentration monitoring instrument 5a is provided in the waste concentrated sulfuric acid storage tank 5.

[0026] The online monitoring sulfate concentration meter 5a, sulfuric acid pump a1, and wastewater pump a2 are respectively connected to the PLC control device. The PLC control device can control the sulfuric acid pump a1 and the wastewater pump a2 to pump the required amount of sulfuric acid and wastewater into the sulfuric acid dilution tank 6 for dilution reaction according to the sulfuric acid concentration detected by the online monitoring sulfate concentration meter 5a.

[0027] In this embodiment, the sulfuric acid dilution tank 6 is connected to a condensed water circulation system. The sulfuric acid dilution tank 6 has an outer shell on the outside, and a cavity is formed between the sulfuric acid dilution tank 6 and the outer shell. The condensed water circulation system is used to transport condensed water into the cavity to cool the sulfuric acid dilution tank 6.

[0028] Specifically, Figure 1 As shown, the condensed water circulation system includes a condensed water treatment box 11, which is connected to the clamping chamber and connected to the PLC control device. A thermometer 12 connected to the PLC control device is provided in the sulfuric acid dilution tank 6, and the PLC control device can control the condensed water cooling temperature set by the condensed water treatment box 11 according to the temperature in the sulfuric acid dilution tank 6 detected by the thermometer 12.

[0029] The sulfuric acid dilution tank 6 and the scrap iron storage tank 7 are respectively connected to the ferrous sulfate reaction tank 8, and the ferrous sulfate reaction tank 8 is respectively connected to the waste gas alkali scrubber 9 and the Fenton reaction tank 3. The waste dilute sulfuric acid and scrap iron in the sulfuric acid dilution tank 6 and the scrap iron storage tank 7 are respectively introduced into the ferrous sulfate reaction tank 8 for reaction, and the gas and ferrous sulfate solution generated by the reaction are respectively introduced into the waste gas alkali scrubber 9 and the Fenton reaction tank 3.

[0030] The gases generated by the reaction in the ferrous sulfate reaction tank 8 include hydrogen sulfide gas and hydrogen. A sodium hydroxide solution is provided in the waste gas alkali scrubber 9. After the gas is passed into the waste gas alkali scrubber 9, the hydrogen sulfide gas is removed to generate a sodium sulfide solution. The waste gas alkali scrubber 9 is connected to the sequencing batch reaction tank 2 to pass the generated sodium sulfide solution into the sequencing batch reaction tank 2 to coagulate and flocculate the industrial wastewater. The waste gas alkali scrubber 9 is also connected to a hydrogen collection storage tank 13 for collecting hydrogen.

[0031] The industrial wastewater after coagulation and flocculation in the sequencing batch reaction tank 2 is introduced into the Fenton reaction tank 3. A wastewater monitor 3a for monitoring various indicators of the wastewater is provided in the Fenton reaction tank 3. A first dosing pump a3 is provided between the ferrous sulfate reaction tank 8 and the Fenton reaction tank 3. The wastewater monitor 3a and the first dosing pump a3 are respectively connected to the PLC control device. The PLC control device can control the first dosing pump a3 to pump the required amount of ferrous sulfate solution into the Fenton reaction tank 3 for reaction according to the monitoring data of the wastewater monitor 3a.

[0032] The Fenton reaction tank 3 is also connected to a hydrogen peroxide dosing box 14, and a second dosing pump a4 is provided between the hydrogen peroxide dosing box 14 and the Fenton reaction tank 3. The second dosing pump a4 is connected to a PLC control device. The PLC control device can control the second dosing pump a4 to pump the required amount of hydrogen peroxide into the Fenton reaction tank 3 for reaction according to the monitoring data of the wastewater monitor 3a.

[0033] The Fenton reaction tank 3 is also connected to a pH adjustment dosing box 15, a third dosing pump a5 is provided between the pH adjustment dosing box 15 and the Fenton reaction tank 3, a pH meter 16 is provided in the Fenton reaction tank 3, the third dosing pump a5 and the pH meter 16 are respectively connected to the PLC control device, and the PLC control device can control the third dosing pump a5 to pump the required amount of pH adjuster into the Fenton reaction tank 3 according to the pH value of the wastewater detected by the pH meter 16 to adjust the pH of the wastewater to between 8 and 9.

[0034] The Fenton reaction tank 3 is also connected to the sludge tank 10 , and the effluent after the reaction is discharged to the intermediate water tank 4 , and the sludge is discharged to the sludge tank 10 .

[0035] The intermediate water tank 4 is also connected to the main regulating tank 17 and the biochemical system 18 in sequence. Most of the water in the intermediate water tank 4 enters the main regulating tank 17 and then enters the biochemical system 18 for biochemical treatment. Qualified effluent is finally discharged into the municipal pipe network.

[0036] In addition, the sulfuric acid dilution tank 6, the ferrous sulfate reaction tank 8, the Fenton reaction tank 3, and the sequencing batch reaction tank 2 are all provided with stirring devices.

[0037] When the present embodiment is working, the online monitoring sulfate concentration meter 5a first monitors the concentration of sulfuric acid in the waste concentrated sulfuric acid storage tank 5 and sends it to the PLC control device. The PLC control device calculates the amount of wastewater and concentrated sulfuric acid required to dilute the concentrated sulfuric acid to 10%, first controls the wastewater pump a2 to pump the wastewater in the intermediate water tank 4 into the sulfuric acid dilution tank 6, and then controls the sulfuric acid pump a1 to slowly inject the concentrated sulfuric acid in the waste concentrated sulfuric acid storage tank 5 into the sulfuric acid dilution tank 6 for dilution reaction. During the dilution reaction, the thermometer 12 detects the internal temperature of the sulfuric acid dilution tank 6 in real time and sends it to the PLC control device. The PLC control device controls the temperature of the condensed water cooling set by the condensed water treatment box 11 according to the temperature data. The condensed water treatment box 11 circulates the condensed water to the sulfuric acid dilution tank 6, absorbs a large amount of heat released during the sulfuric acid dilution process, and ensures the safe conduct of the reaction.

[0038] 10% of the waste dilute sulfuric acid in the sulfuric acid dilution tank 6 is passed into the ferrous sulfate reaction tank 8, and then the scrap iron in the scrap iron storage tank 7 is slowly and batchwise put into the ferrous sulfate reaction tank 8 for full reaction to generate a ferrous sulfate solution until it is saturated. During the reaction, a large amount of hydrogen and a small amount of by-product hydrogen sulfide gas are generated, and the hydrogen and hydrogen sulfide gases pass through the waste gas alkali scrubber 9. The sodium hydroxide solution in the waste gas alkali scrubber 9 is used to remove the hydrogen sulfide gas, and the generated sodium sulfide solution is passed into the batch reaction tank 2 for industrial wastewater coagulation and flocculation to remove heavy metal copper, and relatively pure hydrogen is collected in the hydrogen collection tank 13, which can be used as a clean energy source.

[0039] The reaction equation occurring in the ferrous sulfate reaction tank 8 is:

[0040] Fe+H2SO4(dilute)=FeSO4+H2↑

[0041] The industrial wastewater in the industrial wastewater storage tank 1 enters the Fenton reaction tank 3 after coagulation and flocculation in the sequencing batch reaction tank 2. The wastewater monitor 3a in the Fenton reaction tank 3 sends various indicators of the wastewater to the PLC control device. The PLC control device first controls the first dosing pump a3 to work according to the monitoring indicators of the wastewater, and puts an appropriate amount of saturated ferrous sulfate solution into the Fenton reaction tank 3 for reaction. Since this saturated ferrous sulfate solution is strongly acidic, it can not only adjust the pH of the wastewater to 2-4 required by the Fenton reaction, but also serve as the ferrous agent of the Fenton reagent. Then, according to the Fe 2+ : The molar ratio of H2O2 is 3:1, and an appropriate amount of hydrogen peroxide is added through the second dosing pump a4 to carry out Fenton reaction. After the Fenton reaction is completed, the PLC control device controls the third dosing pump a5 to add a pH regulator according to the detection value of the pH meter 16 to adjust the pH of the wastewater to 8-9 for coagulation and sedimentation. The effluent is discharged to the intermediate water tank 4, and the sludge is discharged to the sludge tank 10.

[0042] Most of the water in the intermediate water tank 4 enters the main regulating tank 17 and then enters the biochemical system 18 for biochemical treatment. The qualified effluent is finally discharged into the municipal pipe network, and a small part is used as dilution water for the previous stage of waste concentrated sulfuric acid.

[0043] Of course, the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any modifications made according to the spirit of the main technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A comprehensive disposal system for recycling and utilizing waste concentrated sulfuric acid and waste iron filings, characterized in that: The invention comprises an industrial wastewater storage tank (1), a sequencing batch reaction tank (2), a Fenton reaction tank (3), an intermediate water tank (4), a waste concentrated sulfuric acid storage tank (5), a sulfuric acid dilution tank (6), a waste iron storage tank (7), a ferrous sulfate reaction tank (8), an exhaust gas alkali scrubbing tower (9), a sludge tank (10), and a PLC control device. The industrial wastewater storage tank (1), the sequencing batch reaction tank (2), the Fenton reaction tank (3), and the intermediate water tank (4) are connected in sequence. The waste concentrated sulfuric acid storage tank (5) and the intermediate water tank (4) are respectively connected to the sulfuric acid dilution tank (6). A sulfuric acid pump (a1) and a wastewater pump (a2) are respectively provided between the waste concentrated sulfuric acid storage tank (5), the intermediate water tank (4), and the sulfuric acid dilution tank (6). An online sulfate concentration monitoring instrument (5a) is provided in the waste concentrated sulfuric acid storage tank (5). The online sulfate concentration monitoring instrument (5a), the sulfuric acid pump (a1), and the wastewater pump (a2) are respectively connected to the PLC control device. The PLC control device can monitor the sulfate concentration according to the online monitoring. The sulfuric acid concentration detected by the instrument (5a) controls the sulfuric acid pump (a1) and the waste water pump (a2) to pump the required amount of sulfuric acid and waste water into the sulfuric acid dilution tank (6) for dilution reaction; the sulfuric acid dilution tank (6) and the waste iron storage tank (7) are respectively connected to the ferrous sulfate reaction tank (8), and the ferrous sulfate reaction tank (8) is respectively connected to the waste gas alkali scrubbing tower (9) and the Fenton reaction tank (3); the waste dilute sulfuric acid and waste iron in the sulfuric acid dilution tank (6) and the waste iron storage tank (7) are respectively introduced into The ferrous sulfate reaction tank (8) reacts, and the gas and ferrous sulfate solution generated by the reaction are respectively introduced into the waste gas alkali scrubber (9) and the Fenton reaction tank (3); the gas comprises hydrogen sulfide gas, and the waste gas alkali scrubber (9) is provided with a sodium hydroxide solution. After the gas is introduced into the waste gas alkali scrubber (9), a sodium sulfide solution can be generated. The waste gas alkali scrubber (9) is connected to the sequencing batch reaction tank (2) to pass the generated sodium sulfide solution into the sequencing batch reaction tank (2) to perform coagulation and flocculation on the industrial waste water; The industrial wastewater after coagulation and flocculation in the batch reaction tank (2) is introduced into the Fenton reaction tank (3). The Fenton reaction tank (3) is provided with a wastewater monitor (3a) for monitoring various indicators of the wastewater. A first dosing pump (a3) ​​is provided between the ferrous sulfate reaction tank (8) and the Fenton reaction tank (3). The wastewater monitor (3a) and the first dosing pump (a3) ​​are respectively connected to the PLC control device. The PLC control device can control the first dosing pump (a3) ​​to pump a required amount of ferrous sulfate solution into the Fenton reaction tank (3) for reaction according to monitoring data of the wastewater monitor (3a). The Fenton reaction tank (3) is also connected to the sludge tank (10). The effluent after the reaction is discharged to the intermediate water tank (4), and the sludge is discharged to the sludge tank (10). The sulfuric acid dilution tank (6) is connected to a condensed water circulation system. The sulfuric acid dilution tank (6) has an outer shell on its exterior. A cavity is formed between the sulfuric acid dilution tank (6) and the outer shell. The condensed water circulation system is used to transport condensed water into the cavity to cool the sulfuric acid dilution tank (6). The gas generated by the reaction in the ferrous sulfate reaction tank (8) also includes hydrogen, and the waste gas alkali scrubbing tower (9) is also connected to a hydrogen collection storage tank (13) for collecting hydrogen.

2. The comprehensive disposal system for recycling and utilizing waste concentrated sulfuric acid and waste iron filings according to claim 1 is characterized in that: The condensed water circulation system comprises a condensed water treatment box (11), the condensed water treatment box (11) is connected to the clamping cavity, and the condensed water treatment box (11) is connected to the PLC control device.

3. The comprehensive disposal system for recycling and utilizing waste concentrated sulfuric acid and waste iron filings according to claim 2 is characterized in that: A thermometer (12) connected to the PLC control device is provided in the sulfuric acid dilution tank (6), and the PLC control device can control the condensed water cooling temperature set in the condensed water treatment box (11) according to the temperature in the sulfuric acid dilution tank (6) detected by the thermometer (12).

4. The comprehensive disposal system for recycling and utilizing waste concentrated sulfuric acid and waste iron scraps according to claim 1 is characterized in that: The Fenton reaction tank (3) is connected to a hydrogen peroxide dosing box (14), a second dosing pump (a4) is provided between the hydrogen peroxide dosing box (14) and the Fenton reaction tank (3), the second dosing pump (a4) is connected to the PLC control device, and the PLC control device can control the second dosing pump (a4) to pump a required amount of hydrogen peroxide into the Fenton reaction tank (3) for reaction according to monitoring data of the wastewater monitor (3a).

5. The comprehensive disposal system for recycling and utilizing waste concentrated sulfuric acid and waste iron scraps according to claim 1 is characterized in that: The Fenton reaction tank (3) is connected to a pH adjustment dosing box (15), a third dosing pump (a5) is provided between the pH adjustment dosing box (15) and the Fenton reaction tank (3), a pH meter (16) is provided in the Fenton reaction tank (3), the third dosing pump (a5) and the pH meter (16) are respectively connected to the PLC control device, and the PLC control device can control the third dosing pump (a5) to pump a required amount of pH adjuster into the Fenton reaction tank (3) according to the pH value of the wastewater detected by the pH meter (16) to adjust the pH of the wastewater to between 8 and 9.

6. The comprehensive disposal system for recycling and utilizing waste concentrated sulfuric acid and waste iron scraps according to claim 1 is characterized in that: The intermediate water tank (4) is also connected in sequence to a main regulating tank (17) and a biochemical system (18). Most of the water in the intermediate water tank (4) enters the main regulating tank (17) and then enters the biochemical system (18) for biochemical treatment. Qualified effluent is finally discharged into the municipal pipe network.

7. The comprehensive disposal system for recycling and utilizing waste concentrated sulfuric acid and waste iron scraps according to claim 1 is characterized in that: The sulfuric acid dilution tank (6), the ferrous sulfate reaction tank (8), the Fenton reaction tank (3), and the sequencing batch reaction tank (2) are all provided with stirring devices.

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