Treatment device and treatment method for p-nitrophenol wastewater

Abstract

The present application relates to a kind of p-nitrophenol wastewater treatment device and processing method, the treatment device includes liquid storage device and degradation device, degradation device is equipped with water outlet and water inlet, the position of water outlet is higher than water inlet, water inlet is communicated with liquid storage device by pipeline, p-nitrophenol wastewater is first sent to degradation device from liquid storage device by pipeline, then from water outlet flows back to liquid storage device;Wherein, degradation device inside is equipped with detachable fixed column, fixed column is equipped with detachable iron sheet, the area of iron sheet is less than the cross section of degradation device.When p-nitrophenol in water body is removed using the treatment device, additional catalyst or oxidizing agent is not needed, p-nitrophenol in water body can be completely removed, it is simple and easy to operate and low in cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, in particular to a device and method for treating p-nitrophenol wastewater. BACKGROUND

[0002] P-nitrophenol (PNP) is a kind of chemical raw material and pharmaceutical intermediate with wide application, and has a long half-life in the natural environment. It is an environmental endocrine disruptor, and seriously threatens the ecological environment and human health after entering the water body. At present, the treatment methods for removing p-nitrophenol in water body mainly include biological degradation method, chemical oxidation method and physical adsorption method. However, the above treatment methods all have defects. When the biological degradation method is used to remove p-nitrophenol, the aromatic ring of p-nitrophenol has a nitro group, so the removal is very slow. When the physical adsorption method is used to remove p-nitrophenol, p-nitrophenol only undergoes transfer, so it usually needs subsequent treatment. When the chemical treatment method is used to remove p-nitrophenol, a catalyst or an oxidizing agent usually needs to be added, and the treatment cost is high. Therefore, it is urgent to develop a simple treatment device and method for removing p-nitrophenol in water body. SUMMARY

[0003] Therefore, it is necessary to provide a device and method for treating p-nitrophenol wastewater in view of the above problems. When the device is used to remove p-nitrophenol in water body, no catalyst or oxidizing agent needs to be added, and p-nitrophenol in water body can be completely removed, which is simple to operate and low in cost.

[0004] The present application discloses a device for treating p-nitrophenol wastewater, which comprises a liquid storage device and a degradation device. The degradation device is provided with a water outlet and a water inlet. The position of the water outlet is higher than that of the water inlet. The water inlet and the liquid storage device are connected through a pipeline. P-nitrophenol wastewater is first transported from the liquid storage device to the degradation device through the pipeline, and then flows out from the water outlet back to the liquid storage device. The degradation device is internally provided with a detachable fixing column. The fixing column is provided with a detachable iron sheet. The area of the iron sheet is smaller than the cross section of the degradation device.

[0005] In an embodiment, the iron sheet is in the shape of an arc. In the direction parallel to the fixing column, the projections of adjacent iron sheets do not completely overlap.

[0006] In an embodiment, the iron sheet satisfies at least one of the following conditions:

[0007] (1) The iron sheet is in the shape of an arc with an area of 11.4cm 2 -12.2cm 2 and a chord length of 2cm-2.8cm.

[0008] (2) the thickness of the iron sheet is 0.28cm-0.32cm;

[0009] (3) the number of the iron sheet is 12-16;

[0010] (4) the chords of adjacent iron sheets are parallel.

[0011] In an embodiment, the fixing column is threaded, the center of the iron sheet is provided with a through hole, the iron sheet is sleeved on the fixing column through the through hole, and is fixed through a nut.

[0012] In an embodiment, the degradation device is cylindrical, has an opening at the top, can be opened by rotating, and has a liquid storage capacity of 0.28L-0.32L.

[0013] A treatment method of p-nitrophenol wastewater, comprising the following steps:

[0014] providing a treatment device, wherein the treatment device is as described above;

[0015] transporting the p-nitrophenol wastewater from the liquid storage device to the degradation device through a pipeline, and then transporting the p-nitrophenol wastewater back to the liquid storage device through a water outlet, wherein the distance between the water outlet and the liquid level of the p-nitrophenol wastewater in the liquid storage device is greater than or equal to 5cm; and

[0016] adjusting the pH of the p-nitrophenol wastewater to be acidic, so that the p-nitrophenol undergoes a Fenton-like reaction, until the p-nitrophenol in the p-nitrophenol wastewater is completely degraded.

[0017] In an embodiment, the step of providing the treatment device comprises: sequentially using alkaline solution and acid solution to ultrasonically clean the iron sheet in the treatment device, so as to remove grease on the surface of the iron sheet.

[0018] In an embodiment, in the step of transporting the p-nitrophenol wastewater back to the liquid storage device through the water outlet, the distance between the water outlet and the liquid level of the p-nitrophenol wastewater in the liquid storage device is 5cm-8cm, and the dissolved oxygen concentration in the p-nitrophenol wastewater is 5mg / L-8mg / L.

[0019] In an embodiment, the step of adjusting the pH of the p-nitrophenol wastewater to be acidic comprises: adjusting the pH of the p-nitrophenol wastewater to be 4.5-6.5.

[0020] In an embodiment, in the step of making the p-nitrophenol undergo a Fenton-like reaction, the reaction temperature is 25℃-30℃, and the reaction time is 8h-12h.

[0021] In the treatment device provided by the present application, the detachable iron sheet on the fixing column can provide Fe 2+In the step of transporting the p-nitrophenol wastewater from the liquid storage device to the degradation device through the pipeline, and then flowing out from the water outlet back to the liquid storage device, a large amount of oxygen can be introduced into the p-nitrophenol wastewater; when the treatment device is used to treat the p-nitrophenol wastewater, the pH of the p-nitrophenol wastewater is adjusted to be acidic, so that the iron sheet in the treatment device can generate Fe 2+ , Fe 2+ reacts with the oxygen in the p-nitrophenol wastewater to generate free radicals, the free radicals react with the p-nitrophenol to generate a Fenton-like reaction, so that the p-nitrophenol can be degraded, and then the p-nitrophenol in the water body can be completely removed without additional addition of catalyst or oxidant, which is simple in operation and low in cost. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0023] Figure 1 The structural schematic diagram of the treatment device provided by the present application is shown in the figure.

[0024] Figure 2 The structural schematic diagram of the iron sheet in the treatment device provided by the present application is shown in the figure.

[0025] In the figure, 10 is a degradation device, 101 is an iron sheet, 102 is a fixing column, 103 is a water inlet, 104 is a water outlet, 20 is a liquid storage device, 30 is a pipeline, and 40 is a submersible pump. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present application, the present application will be described in more detail below. However, it should be understood that the present application can be realized in many different forms, and is not limited to the embodiments or examples described herein. On the contrary, the purpose of providing these embodiments or examples is to make the disclosure of the present application more thorough and comprehensive.

[0027] 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 in the specification of this invention is for the purpose of describing particular embodiments or examples only and is not intended to limit the invention. The optional scope of the term "and / or" as used herein includes any one of two or more of the related listed items, as well as any and all combinations of the related listed items, including any two related listed items, any more related listed items, or a combination of all related listed items.

[0028] To remove p-nitrophenol from water without the need for additional catalysts or oxidants, such as Figure 1 As shown, the present invention provides a treatment device for p-nitrophenol wastewater, including a storage device 20 and a degradation device 10. The degradation device 10 is provided with an outlet 104 and an inlet 103. The outlet 104 is positioned higher than the inlet 103. The inlet 103 is connected to the storage device 20 through a pipe 30. The p-nitrophenol wastewater is first transported from the storage device 20 to the degradation device 10 through the pipe 30, and then flows out from the outlet 104 back to the storage device 20. The degradation device 10 is provided with a detachable fixing column 102 inside, and a detachable iron sheet 101 is provided on the fixing column 102. The area of ​​the iron sheet 101 is smaller than the cross-section of the degradation device 10.

[0029] In the processing apparatus provided by the present invention, the detachable iron sheet 101 on the fixed column 102 can provide Fe 2+ In the process of transporting p-nitrophenol wastewater from storage device 20 to degradation device 10 via pipeline 30, and then flowing back to storage device 20 from outlet 104, a large amount of oxygen can be introduced into the p-nitrophenol wastewater. When this treatment device is used to treat p-nitrophenol wastewater, the pH of the p-nitrophenol wastewater is adjusted to acidic, causing the iron sheet 101 in the treatment device to undergo a redox reaction to generate Fe. 2+ Fe 2+ It reacts with oxygen in p-nitrophenol wastewater to generate free radicals, which then undergo a Fenton-like reaction with p-nitrophenol, thereby degrading p-nitrophenol. Thus, without the addition of additional catalysts or oxidants, p-nitrophenol in water can be completely removed. The operation is simple and inexpensive.

[0030] In one embodiment, the iron sheet 101 is arc-shaped, including but not limited to a minor arc arc and a major arc arc. It is understood that the arc length of the major arc arc is greater than that of a semicircle, and the arc length of the minor arc arc is less than that of a semicircle; preferably, as... Figure 2 As shown, the iron sheet 101 has a superior arc shape and an area of ​​11.4 cm². 2 -12.2cm 2, including but not limited to 11.4cm 2 , 11.6cm 2 , 11.8cm 2 , 12.0cm 2 or 12.2cm 2 ; chord length is 2cm-2.8cm, including but not limited to 2cm, 2.2cm, 2.4cm, 2.6cm or 2.8cm; thereby increasing the concentration of Fe 2+ in p-nitrophenol wastewater, better promoting Fenton-like reaction.

[0031] In an embodiment, the projections of adjacent iron sheets 101 do not completely overlap in the direction parallel to the fixing column 102, thereby playing a role similar to stirring in the step of transporting p-nitrophenol wastewater from the liquid storage device 20 to the degradation device 10 through the pipeline 30; when the iron sheet 101 is in an arc shape, preferably, the projections of adjacent iron sheets 101 do not completely overlap, and the chords of adjacent iron sheets 101 are parallel.

[0032] The iron sheet 101 is detachably fixed on the fixing column 102, which is conducive to the cleaning and replacement of the iron sheet 101; in an embodiment, the fixing column 102 is threaded, and the center of the iron sheet 101 is provided with a through hole, and the iron sheet 101 is sleeved on the fixing column 102 through the through hole and is fixed by a nut.

[0033] In an embodiment, the spacing between adjacent iron sheets 101 is 0.5cm-0.7cm, including but not limited to 0.5cm, 0.55cm, 0.60cm, 0.65cm or 0.70cm.

[0034] In an embodiment, the thickness of the iron sheet 101 is 0.28cm-0.32cm, including but not limited to 0.28cm, 0.29cm, 0.30cm, 0.31cm or 0.32cm, and the number of iron sheets 101 is 12-16, including but not limited to 12, 13, 14, 15 or 16, thereby increasing the concentration of Fe 2+ in p-nitrophenol wastewater, better promoting the progress of Fenton-like reaction.

[0035] In an embodiment, the degradation device 10 is in a cylindrical shape, and the liquid storage capacity is 0.28L-0.32L, including but not limited to 0.28L, 0.29L, 0.30L, 0.31L or 0.32L.

[0036] In an embodiment, the top of the degradation device 10 has an opening which can be opened by rotating, thereby being more convenient for cleaning and replacing the iron sheet 101.

[0037] In an embodiment, a valve is arranged on the pipeline 30, which can prevent the p-nitrophenol wastewater in the degradation device 10 from flowing back to the storage device 20 through the pipeline 30.

[0038] In an embodiment, a submersible pump 40 is arranged in the storage device 20, which can transport the p-nitrophenol wastewater from the storage device 20 to the degradation device 10 through the pipeline 30, and then flow back to the storage device 20 from the water outlet 104.

[0039] The application also provides a treatment method of p-nitrophenol wastewater, which comprises the following steps:

[0040] S10, providing a treatment device, which is as described in the application;

[0041] S20, transporting the p-nitrophenol wastewater from the storage device 20 to the degradation device 10 through the pipeline 30, and then transporting the p-nitrophenol wastewater back to the storage device 20 through the water outlet 104; and

[0042] S30, adjusting the pH of the p-nitrophenol wastewater to be acidic, so that the p-nitrophenol undergoes a Fenton-like reaction, until the p-nitrophenol in the p-nitrophenol wastewater is completely degraded.

[0043] In step S10, the detachable iron sheet 101 on the fixed column 102 can provide Fe 2+ In an embodiment, the step of providing the treatment device comprises sequentially performing ultrasonic cleaning on the iron sheet 101 in the treatment device with alkaline solution and acid solution to remove grease on the surface of the iron sheet 101.

[0044] In an embodiment, the alkaline solution is selected from a sodium hydroxide aqueous solution with a concentration of 0.08 mmol / L-0.12 mmol / L, so as to remove the grease on the surface of the iron sheet 101; in the step of performing ultrasonic cleaning on the iron sheet 101 in the treatment device with the alkaline solution, the temperature is 20℃-25℃, and the time is 8 min-12 min.

[0045] In an embodiment, the acid solution is selected from a hydrogen chloride aqueous solution with a concentration of 0.08 mmol / L-0.12 mmol / L, so as to better remove the residual alkaline solution on the surface of the iron sheet 101; in the step of performing ultrasonic cleaning on the iron sheet 101 in the treatment device with the acid solution, the temperature is 20℃-25℃, and the time is 8 min-12 min.

[0046] In step S20, in the step of transporting the p-nitrophenol wastewater from the storage device 20 to the degradation device 10 through the pipeline 30, and then flowing back to the storage device 20 from the water outlet 104, a large amount of oxygen can be introduced into the p-nitrophenol wastewater; for example, Figure 1As shown, the distance between the outlet 104 and the liquid level of the p-nitrophenol wastewater in the liquid storage device 20 is d, and d is greater than or equal to 5 cm, preferably, d is 5 cm-8 cm, including but not limited to 5 cm, 6 cm, 7 cm or 8 cm, so that the dissolved oxygen concentration in the p-nitrophenol wastewater is 5 mg / L-8 mg / L, including but not limited to 5 mg / L, 6 mg / L, 7 mg / L or 8 mg / L.

[0047] In an embodiment, a submersible pump 40 is arranged in the liquid storage device 20, and the p-nitrophenol wastewater is transported from the liquid storage device 20 to the degradation device 10 through the pipeline 30 by the submersible pump 40, and then flows out from the outlet 104 back to the liquid storage device 20, and the submersible pump 40 is selected from a submersible pump 40 with a power of 5 W-7 W.

[0048] In step S30, the pH of the p-nitrophenol wastewater is adjusted to be acidic, so that the iron sheet 101 in the treatment device generates Fe 2+ , Fe 2+ reacts with oxygen in the p-nitrophenol wastewater to generate free radicals, and the free radicals react with the p-nitrophenol to generate a Fenton-like reaction, thereby achieving degradation of the p-nitrophenol.

[0049] In an embodiment, the step of adjusting the pH of the p-nitrophenol wastewater to be acidic includes adjusting the pH of the p-nitrophenol wastewater to be 4.5-6.5, including but not limited to 4.5, 5.0, 5.5, 6.0 or 6.5, so that not only the iron sheet 101 can better generate Fe 2+ , but also the Fenton-like reaction can be more beneficial.

[0050] In an embodiment, in the step of making the p-nitrophenol undergo a Fenton-like reaction, the temperature is 25℃-30℃, including but not limited to 25℃, 26℃, 27℃, 28℃, 29℃ or 30℃, and the time is 8h-12h, including but not limited to 8h, 9h, 10h, 11h or 12h.

[0051] In an embodiment, in the step of making the p-nitrophenol undergo a Fenton-like reaction, air is blown into the liquid storage device 20, so as to increase the oxygen content in the p-nitrophenol water body, and further increase the free radical content in the p-nitrophenol water body.

[0052] The treatment method for p-nitrophenol wastewater provided by the present application can completely remove the p-nitrophenol in the water body without additional addition of catalysts or oxidants, and is simple to operate and low in cost.

[0053] In the following, the treatment device and treatment method for p-nitrophenol wastewater will be further described through the following specific embodiments.

[0054] Embodiment 1

[0055] A treatment device for p-nitrophenol wastewater is provided, which comprises a liquid storage device 20 and a degradation device 10. The degradation device 10 is provided with a water outlet 104 at the upper side and a water inlet 103 at the bottom. The water inlet 103 is connected to the liquid storage device 20 through a pipeline 30 with a valve.

[0056] The degradation device 10 is in the shape of a cylindrical barrel with a cross-sectional area of 19.6 cm 2 and a height of 25 cm. The interior of the degradation device 10 is provided with a detachable fixing column 102 with a thread. Fifteen iron sheets 101 in the shape of an arc of a circle are provided, with a chord length of 2.8 cm, an arc length of 9.4 cm, and an area of 11.4 cm 2 . The iron sheets 101 are first ultrasonically cleaned with a 0.1 mmol / L sodium hydroxide aqueous solution for 10 min, and then ultrasonically cleaned with a 0.1 mmol / L hydrochloric acid aqueous solution for 10 min. The iron sheets 101 are provided with through holes at the center, are sleeved on the fixing column 102 through the through holes, and are fixed through nuts. The adjacent iron sheets 101 are spaced apart by 0.7 cm. In the direction parallel to the fixing column 102, the projections of the adjacent iron sheets 101 do not completely overlap, and the chords are parallel to each other.

[0057] The liquid storage device 20 is provided with a submersible pump 40. The submersible pump 40 transports the p-nitrophenol wastewater from the liquid storage device 20 to the degradation device 10 through the pipeline 30, and then flows out from the water outlet 104 back to the liquid storage device 20.

[0058] The valve is opened, and the submersible pump 40 with a power of 6 W is started. The p-nitrophenol wastewater is transported from the liquid storage device 20 to the degradation device 10 through the pipeline 30, and then flows out from the water outlet 104 back to the liquid storage device 20. The distance between the water outlet 104 and the liquid level of the p-nitrophenol wastewater in the liquid storage device 20 is 6 cm. The dissolved oxygen concentration in the p-nitrophenol wastewater is 6.2 mg / L.

[0059] The pH of the p-nitrophenol wastewater is adjusted to 5, so that the p-nitrophenol undergoes a Fenton-like reaction. The pH and the concentration of the p-nitrophenol in the p-nitrophenol wastewater are measured every 2 h. When the pH is greater than 6.5, the pH is adjusted to 5.0. The concentration of the p-nitrophenol in the p-nitrophenol wastewater is shown in Table 1.

[0060] Comparative Example 1

[0061] Comparative Example 1 is performed according to Example 1, except that the pH of the p-nitrophenol wastewater is adjusted to 7. The concentration of the p-nitrophenol in the p-nitrophenol wastewater is shown in Table 1.

[0062] Comparative Example 2

[0063] Comparative Example 2 was conducted in the same manner as Example 1 except that the pH of the p-nitrophenol wastewater was adjusted to 11 and the concentration of p-nitrophenol in the p-nitrophenol wastewater was as shown in Table 1.

[0064] Table 1

[0065] Time (h) Example 1 Comparative Example 1 Comparative Example 2 0 15.44 15.7 15.20 2 11.38 14.59 15.91 4 3.29 14.12 16.16 6 0.88 14.84 14.15 8 0 14.05 13.93 10 / 13.62 13.07 12 / 13.06 13.78

[0066] Comparative Example 3

[0067] Comparative Example 3 was conducted in the same manner as Example 1 except that the iron sheet 101 was replaced with a plastic sheet of the same shape and the concentration of p-nitrophenol in the p-nitrophenol wastewater was as shown in Table 2.

[0068] Comparative Example 4

[0069] Comparative Example 4 was conducted in the same manner as Comparative Example 3 except that the pH of the p-nitrophenol wastewater was adjusted to 7 and the concentration of p-nitrophenol in the p-nitrophenol wastewater was as shown in Table 2.

[0070] Comparative Example 5

[0071] Comparative Example 5 was conducted in the same manner as Comparative Example 3 except that the pH of the p-nitrophenol wastewater was adjusted to 11 and the concentration of p-nitrophenol in the p-nitrophenol wastewater was as shown in Table 2.

[0072] Comparative Example 6

[0073] Comparative Example 6 was conducted in the same manner as Example 1 except that the distance between the outlet 104 and the liquid level of the p-nitrophenol wastewater in the liquid storage device 20 was 0, the concentration of dissolved oxygen in the p-nitrophenol wastewater was 1.8 mg / L, and the concentration of p-nitrophenol in the p-nitrophenol wastewater was as shown in Table 2.

[0074] Comparative Example 7

[0075] Comparative Example 7 was conducted in the same manner as Example 1 except that the distance between the outlet 104 and the liquid level of the p-nitrophenol wastewater in the liquid storage device 20 was 3 cm, the concentration of dissolved oxygen in the p-nitrophenol wastewater was 3.8 mg / L, and the concentration of p-nitrophenol in the p-nitrophenol wastewater was as shown in Table 2.

[0076] Table 2

[0077] Time (h) Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 0 15.98 15.90 15.83 14.84 14.71 2 13.62 13.85 15.17 14.83 12.65 4 13.50 13.28 15.06 14.89 11.13 6 12.92 13.77 14.17 14.43 9.94 8 12.18 13.85 13.22 14.27 9.17 10 12.79 13.65 13.55 14.47 8.88 12 13.07 13.19 13.75 14.02 8.13

[0078] Example 2

[0079] Example 2 was conducted in the same manner as Example 1 except that the distance between the outlet 104 and the liquid level of the p-nitrophenol wastewater in the liquid storage device 20 was 8 cm, the concentration of dissolved oxygen in the p-nitrophenol wastewater was 8.2 mg / L, and the concentration of p-nitrophenol in the p-nitrophenol wastewater was as shown in Table 3.

[0080] Example 3

[0081] Example 3 was conducted according to Example 1, except that the distance between the water outlet 104 and the liquid level of the p-nitrophenol wastewater in the liquid storage device 20 was 6.5 cm, the dissolved oxygen concentration in the p-nitrophenol wastewater was 6.9 mg / L, and the concentration of p-nitrophenol in the p-nitrophenol wastewater was as shown in Table 3.

[0082] Example 4

[0083] Example 4 was conducted according to Example 1, except that the distance between the water outlet 104 and the liquid level of the p-nitrophenol wastewater in the liquid storage device 20 was 5 cm, the dissolved oxygen concentration in the p-nitrophenol wastewater was 5.2 mg / L, and the concentration of p-nitrophenol in the p-nitrophenol wastewater was as shown in Table 3.

[0084] Table 3

[0085] Time (h) Example 2 Example 3 Example 4 0 15.15 14.28 14.53 2 13.94 13.28 12.87 4 13.08 10.20 11.11 6 11.53 4.71 8.75 8 7.17 0.11 4.22 10 2.81 0.00 1.67 12 0 / 0

[0086] The technical features of the above-described embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not contradict each other, they should be considered to be within the scope of the present disclosure.

[0087] The above-described embodiments only express several embodiments of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. A method for treating p-nitrophenol waste water, characterized by, The method comprises the following steps: Providing a treatment device comprising a liquid storage device and a degradation device, the degradation device being provided with a water outlet and a water inlet, the water outlet being located higher than the water inlet, the water inlet being in communication with the liquid storage device through a pipeline, the degradation device being internally provided with a detachable fixing column, the fixing column being provided with detachable iron sheets, the area of the iron sheets being smaller than the cross section of the degradation device, the iron sheets being in an arc shape, and the projections of adjacent iron sheets not completely overlapping in the direction parallel to the fixing column; Transporting p-nitrophenol wastewater from the liquid storage device to the degradation device through the pipeline, and then transporting the p-nitrophenol wastewater back to the liquid storage device through the water outlet, the distance between the water outlet and the liquid level of the p-nitrophenol wastewater in the liquid storage device being greater than or equal to 5 cm; and Blowing air into the liquid storage device, and the dissolved oxygen concentration in the p-nitrophenol wastewater being 5 mg / L-8 mg / L; adjusting the pH of the p-nitrophenol wastewater to be acidic, causing the iron pieces in the treatment device to undergo a redox reaction to generate Fe 2+ , Fe 2+ interact with oxygen in the p-nitrophenol wastewater to generate free radicals, and the free radicals undergo a Fenton-like reaction with the p-nitrophenol until the p-nitrophenol in the p-nitrophenol wastewater is completely degraded.

2. The treatment method according to claim 1, characterized in that, The step of providing the treatment device comprises: sequentially using alkaline solution and acid solution to ultrasonically clean the iron sheets in the treatment device, and removing grease on the surface of the iron sheets.

3. The treatment method of claim 1, wherein In the step of transporting the p-nitrophenol wastewater back to the liquid storage device through the water outlet, the distance between the water outlet and the liquid level of the p-nitrophenol wastewater in the liquid storage device is 5 cm-8 cm.

4. The treatment method according to any one of claims 1 to 3, characterized in that, The step of adjusting the pH of the p-nitrophenol wastewater to be acidic comprises adjusting the pH of the p-nitrophenol wastewater to be 4.5-6.

5.

5. The treatment method according to any one of claims 1 to 3, characterized in that, In the step of causing the p-nitrophenol to undergo a Fenton-like reaction, the reaction temperature is 25℃-30℃, and the reaction time is 8 h-12 h.

6. The treatment method of claim 1, wherein The iron sheets satisfy at least one of the following conditions: (1) the iron sheet is an arcuate bow shape with an area of 11.4 cm 2 - 12.2 cm 2 , and a chord length of 2 cm - 2.8 cm; (2) The thickness of the iron sheets is 0.28 cm-0.32 cm; (3) The number of the iron sheets is 12-16; (4) The chords of adjacent iron sheets are parallel.

7. The treatment method of claim 1, wherein The fixing column is provided with threads, the center of the iron sheet is provided with a through hole, the iron sheet is sleeved on the fixing column through the through hole, and is fixed through a nut.

8. The treatment method according to any one of claims 6-7, characterized in that, The degradation device is in a cylindrical shape, has an opening at the top, can be opened by rotating, and has a storage capacity of 0.28 L-0.32 L.

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