An extraction mixer for ammoximation of wastewater treatment and its method and apparatus

Abstract

The application discloses an extraction mixer for treating ammoxilation wastewater and a method and device thereof. The extraction mixer comprises a jet mixing component and a static mixing component, an internal power-free system, a two-stage Venturi pipeline, and utilizes fluid pressure head and gravity to realize the mixed extraction of wastewater. After extraction, the ammoxilation wastewater is divided into water phase and organic phase, the organic phase can be recycled after back extraction, and the water phase is discharged from the bottom of a mixing separation tank and enters a biochemical treatment stage. Based on the device provided by the application, the extraction method is used for extracting and separating the ammoxilation wastewater, and the processes such as chemical oxidation and electrochemical oxidation are not needed. In the process of ensuring the continuous treatment of the ammoxilation wastewater, the COD value of the ammoxilation wastewater is significantly reduced, and the biodegradability of the ammoxilation wastewater is improved.

Description

Technical Field

[0001] This invention relates to a process for treating ammonia oxime wastewater, specifically to an extraction mixer, method, and apparatus for treating ammonia oxime wastewater, belonging to the field of water resource treatment technology. Background Technology

[0002] Caprolactam is a raw material for the production of PA6 and is an important petrochemical raw material. It is mainly used in the synthesis of polyamide fibers and engineering plastics, and has wide applications in textiles, automobiles, electronics, and machinery. The main processing methods for caprolactam include the cyclohexanone-hydroxylamine method, the cyclohexane-cyclohexanone oxime method, and the toluene method. Most of these methods use cyclohexanone oxime as an intermediate to prepare caprolactam. Among the production methods of cyclohexanone oxime, the liquid-phase ammonium oxime method has been widely used due to its simplicity and low byproduct rate. The wastewater generated by this method mainly contains toluene, tert-butanol, cyclohexanone oxime, and cyclohexanone. The wastewater COD is 5000-7000 mg / L, with extremely low biodegradability and high color.

[0003] Currently, the main methods for treating ammonia oxime wastewater are divided into chemical oxidation and biological treatment. Chemical oxidation methods primarily include Fenton oxidation, acid pretreatment, and electrochemical oxidation. Fenton oxidation mainly uses hydrogen peroxide as the oxidant and ferrous sulfate as the catalyst to treat wastewater. Acid pretreatment utilizes the oxidizing properties of fuming sulfuric acid. Electrochemical oxidation methods often employ iron-carbon micro-electrolysis technology for wastewater treatment. Among these, Fenton oxidation has shown good treatment efficiency, achieving a COD removal rate of up to 60%. Biological treatment methods mainly include suspended sludge and biofilm processes. The main principle is that the aerobic stage decomposes organic matter to reduce COD, while the anoxic stage removes ammonia nitrogen. Using this method, the COD removal rate for ammonia oxime wastewater can reach 70%.

[0004] Chinese invention patent (CN111547943A) discloses a method for treating ammonia oxime wastewater, specifically involving a pretreatment and treatment method for wastewater from the cyclohexanone production process via ammonia oxime. The method includes the following steps: collecting high-ammonia nitrogen wastewater obtained through a rearrangement method and collecting high-phosphorus wastewater from the cyclohexanone oxime production process; mixing the high-ammonia nitrogen wastewater and high-phosphorus wastewater to obtain mixed wastewater; adjusting the pH of the mixed wastewater to 8-10 with concentrated sulfuric acid, then adding magnesium sulfate to react until magnesium ammonium phosphate precipitate is formed, and separating the reaction wastewater and the magnesium ammonium phosphate precipitate. After pretreatment, adjusting the pH of the reaction wastewater to 4.8-5.5 with concentrated sulfuric acid, then recovering the organic components and stripping wastewater through a stripping tower; and finally, biochemically treating the stripping wastewater. This invention can achieve partial recovery of phosphorus and dark ammonia nitrogen from wastewater and reduce the COD value by more than 50%. However, the high cost of this treatment method is due to the recovery of organic components through stripping towers. In addition, the low reduction in COD results in low biodegradability of the wastewater.

[0005] Chinese utility model patent (CN211111492U) discloses a caprolactam oxime wastewater treatment device, including a stirred tank. The stirred tank has a first through-hole and a second through-hole at its bottom and top, respectively, and a third through-hole and a fourth through-hole on its top and bottom sidewalls, respectively. A motor is installed at the bottom of the stirred tank, and the motor output shaft is coaxially rotatably connected to the first through-hole. The wastewater is acidified to facilitate the sedimentation of cyclohexylamine peroxide and cyclohexanoate in the wastewater, and the stirring blades accelerate the sedimentation. Simultaneously, the wastewater is electrolyzed in an electrolytic tank for effective electrolytic sedimentation. A filter membrane is used to filter the wastewater, effectively removing sediment and facilitating subsequent wastewater concentration. The wastewater is then concentrated in a concentration tank and returned to the wastewater inlet for recycling. This invention effectively treats ammonia oxime wastewater through multiple treatment processes including sedimentation, electrolysis, and filtration. However, electrolysis increases processing costs, and the mechanical movement in the stirred tank affects the stability of the processing. Furthermore, the device's processing speed is limited due to multiple settling processes.

[0006] Extraction is also a major method for treating organic wastewater. Currently, the extraction treatment of ammonia oxime wastewater is still in the exploratory stage, lacking effective extraction processes and corresponding equipment. Summary of the Invention

[0007] To address the problems existing in the prior art, the first objective of this invention is to provide an extraction mixer for treating ammonia oxime wastewater. The extraction mixer includes a jet mixing component and a static mixing component. The jet mixing component utilizes the Venturi effect to rapidly mix the ammonia oxime wastewater with the extractant. The static mixing component then mixes the two phases more uniformly, thereby fully extracting the organic components from the ammonia oxime wastewater.

[0008] The second objective of this invention is to provide an apparatus for treating ammonia oxime wastewater. This apparatus includes an extraction mixer, an acidic buffer tank, a mixing and separation tank, an extractant buffer tank, a back-extractant buffer tank, an alkaline buffer tank, and a static mixing tank. The mixing and separation tank contains at least two parallel extraction mixers. The entire extraction process does not involve a power source; extraction and separation are achieved solely by the pressure head and gravity of the ammonia oxime wastewater. This apparatus has a simple structure, is easy to operate, and enables continuous treatment of ammonia oxime wastewater.

[0009] The third objective of this invention is to provide a method for treating ammonia oxime wastewater. Using the ammonia oxime wastewater treatment device provided by this invention, the treatment of ammonia oxime wastewater is achieved through a three-step process of acidification, extraction, and back-extraction. According to tests, the COD removal rate of the treated ammonia oxime wastewater is over 60%, and the purity of the recovered extractant is over 97%.

[0010] To achieve the above-mentioned technical objectives, the present invention provides an extraction mixer for treating ammonia oxime wastewater, comprising a jet mixing component (2-1) and a static mixing component (2-2); the jet mixing component includes a main flow inlet, a secondary flow inlet, a suction chamber, a jet mixing chamber, and a diffusion chamber; the main flow inlet, the suction chamber, the jet mixing chamber, and the diffusion chamber are sequentially connected along the central axis, and the secondary flow inlet is horizontally opened above the suction chamber.

[0011] The extraction mixer provided by this invention consists of two parts: dynamic mixing and static mixing. The dynamic mixing part utilizes the Venturi effect to achieve a local vacuum in the suction chamber, thereby promoting the rapid mixing of the extractant and the ammonium oxime wastewater. Then, the static mixing part makes the two more fully and uniformly mixed, thereby achieving complete extraction of the organic phase in the ammonium oxime wastewater and effectively reducing the COD value of the ammonium oxime wastewater.

[0012] As a preferred embodiment, the main inlet is also provided with a nozzle, which is a tapered nozzle with an opening height lower than that of the secondary inlet.

[0013] The extraction mixer provided by this invention uses a two-stage Venturi conduit, wherein the nozzle is a first-stage Venturi conduit. The nozzle is a tapered nozzle, which reduces the static head and increases the dynamic head at the nozzle opening, significantly increasing the flow velocity and forming a local vacuum above the nozzle opening. This further increases the head difference between the secondary inlet and the main inlet located above the nozzle opening, accelerating the mixing of the two fluids.

[0014] As a preferred embodiment, the main flow inlet is an axial inlet, and the secondary flow inlet is a tangential inlet. The main flow inlet and the secondary flow inlet are orthogonally positioned, which can significantly improve the fluid mixing rate.

[0015] As a preferred embodiment, the static mixing component includes a static mixer and an opening.

[0016] As a preferred embodiment, the static mixer is at least one of the following types: SX, SV, SH, SL, SK, and SD.

[0017] The extraction mixer provided by this invention includes a static mixer within the static mixing component. Through the turbulence created by the static mixer, a local turbulence effect is formed, thereby mixing the extractant and the ammonium oxime wastewater more uniformly and enhancing the extraction of the organic phase from the ammonium oxime wastewater.

[0018] As a preferred embodiment, the opening is a circular opening located below the static mixer.

[0019] The openings of the static mixing component are located on the bottom side, below the mixing separator. The rectifying effect of the small openings ensures that the mixed fluid flows evenly to the settling tank for efficient separation of the extractant and wastewater.

[0020] The present invention also provides an apparatus for treating ammonia oxime wastewater, comprising an extraction mixer, an acidic buffer tank (1), a mixing and separation tank (2), an extractant buffer tank (4), a back-extractant buffer tank (6), an alkaline buffer tank (3), and a static mixing tank (5) as described in any one of the above. The outlet of the acidic buffer tank (1) is connected to the main inlet of the extraction mixer via a pipeline. The top opening of the mixing and separation tank (2), the static mixing tank (5), the alkaline buffer tank (3), and the extractant buffer tank (4) are connected in series via pipelines. The bottom outlet of the alkaline buffer tank (3), the back-extractant buffer tank (6), and the side inlet of the static mixing tank are connected in series via pipelines.

[0021] As a preferred embodiment, the mixing and separating tank (2) is provided with top and bottom openings, and includes a coalescing separation component and n extraction mixers inside; the coalescing separation component (2-3) is located below the extraction mixers; the number of extraction mixers n≥2.

[0022] Multiple sets of parallel extraction mixers can be installed at the top of the mixing and separation tank to accelerate the wastewater treatment efficiency.

[0023] As a preferred embodiment, the coalescing and separating component is woven from oleophilic fibers with a diameter of 10-500 μm.

[0024] As a preferred embodiment, the oleophilic fiber is at least one of polytetrafluoroethylene fiber, polypropylene fiber, polyamide fiber, and polyester fiber.

[0025] The ammonia oxime wastewater treatment device provided by this invention can be adjusted according to the actual wastewater volume during the treatment process. When there is a large flow of wastewater, it can be treated by parallel mixing and separation tanks to meet the continuous treatment of wastewater of various flow rates.

[0026] The present invention also provides a method for treating ammonia oxime wastewater, which is performed by the apparatus described in any one of the above claims.

[0027] As a preferred embodiment, the method for treating ammonia oxime wastewater involves mixing the ammonia oxime wastewater with an acid solution to adjust the pH, thereby obtaining acidified wastewater; then mixing the acidified wastewater with a multi-element extractant to extract an aqueous phase and an organic phase; finally, mixing the organic phase with a back-extractant to recover the extractant.

[0028] As a preferred embodiment, the O / A ratio of the acidified wastewater to the multi-element extractant is 1 to 2:1.

[0029] As a preferred embodiment, the pH of the acidified wastewater is 2-5; the multi-element extractant is composed of cyclohexane, toluene, ethyl acetate, dichloromethane and tributyl phosphate.

[0030] As a preferred embodiment, the back-extraction agent is an alkaline solution and / or a Lewis alkaline solution.

[0031] As a preferred embodiment, the O / A ratio of the organic phase to the back-extraction is 2 to 5:1.

[0032] The present invention also provides a detailed method for treating ammonia oxime wastewater, comprising the following steps: mixing ammonia oxime wastewater and acid solution in an acidic buffer tank, adjusting the amount of acid solution added by an automatic control valve H1 to control the pH of the wastewater, thereby obtaining acidified wastewater;

[0033] 2) Acidified wastewater flows into the main inlet of the extraction mixer through the pipeline and mixes with the multi-component extractant that flows through the secondary inlet. The O / A ratio of the multi-component extractant to the acidified wastewater is adjusted by the automatic control valve H2. After separation by the coalescence separation component, an organic phase and an aqueous phase are obtained. The organic phase is lighter and located on the upper layer of the aqueous phase.

[0034] 3) Once the mixing and separating tank is full of organic and aqueous phases, open the top opening. The organic phase flows into the static separating tank through the top opening pipeline. After closing the top opening, open the bottom opening to discharge the aqueous phase.

[0035] 3) After the organic phase and the back-extractant are fully mixed in the static separation tank, they enter the alkaline buffer tank and separate into layers. The extractant in the organic phase is separated from the organic matter in the ammonia oxime wastewater. The extractant is regenerated and enters the extractant buffer tank for reuse through the alkaline buffer tank. The regenerated back-extractant is then entered into the back-extractant buffer tank for reuse through the power pump connected to the bottom of the tank. The resulting waste alkali is discharged through the bottom of the alkaline buffer tank.

[0036] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0037] 1) The extraction mixer provided by the present invention consists of two parts: dynamic mixing and static mixing. The dynamic mixing part utilizes the Venturi effect to achieve a local vacuum in the suction chamber, thereby promoting the rapid mixing of the extractant and the ammonium oxime wastewater. Then, the static mixing part makes the two more fully and uniformly mixed, thereby achieving complete extraction of the organic phase in the ammonium oxime wastewater and effectively reducing the COD value of the ammonium oxime wastewater.

[0038] 2) The wastewater treatment device provided by the present invention includes an extraction mixer, an acidic buffer tank, a mixing and separation tank, an extractant buffer tank, a back-extractant buffer tank, an alkaline buffer tank, and a static mixing tank. The mixing and separation tank contains at least two parallel extraction mixers. The entire extraction process does not contain a power unit and relies on the pressure head and gravity of the ammonia oxime wastewater for extraction and separation. The device has a simple structure, is easy to operate, and can realize continuous treatment of ammonia oxime wastewater.

[0039] 3) In the technical solution provided by the present invention, the ammonia oxime wastewater treatment device provided by the present invention adopts a three-step process of acidification-extraction-back-extraction to treat the ammonia oxime wastewater. According to the test, the COD removal rate of the treated ammonia oxime wastewater is more than 60%, and the purity of the recovered extractant is more than 97%.

[0040] 4) In the technical solution provided by the present invention, on the basis of the original gravity sedimentation separation, a coalescence separation technology is added, which overcomes the shortcomings of low efficiency of traditional gravity sedimentation and improves the separation efficiency of mixed liquid in the device; furthermore, the extractant and back-extraction agent used in the extraction process can be reused, which reduces the process production cost. Attached Figure Description

[0041] The accompanying drawings are provided to further illustrate the invention and constitute only a part of this specification to further explain the invention, and do not constitute a limitation thereof.

[0042] Figure 1 This is a schematic diagram of the process flow of the ammonia oxime wastewater treatment method in Embodiment 1 of the present invention;

[0043] Figure 2 This is a schematic diagram of the mixing and separating tank used for treating ammonia oxime wastewater in Embodiment 1 of the present invention.

[0044] Figure 3 This is a cross-sectional schematic diagram of the extraction mixer in Embodiment 1 of the present invention.

[0045] Among them, the appendix Figure 1 The markings represent the following devices and components:

[0046] 1. Acidic buffer tank; 2. Mixing and separating tank; 2-1. Spray mixing component; 2-2. Static mixing component; 2-3. Coagulation and separating component; 3. Alkaline buffer tank; 4. Extractant buffer tank; 5. Static mixing tank; 6. Back-extractant buffer tank; H1~H2 automatic control valves.

[0047] Appendix Figure 3 The markings represent the following devices and components:

[0048] A. Mainstream inlet, B. Secondary inlet, C. Nozzle, D. Suction chamber, E. Injection mixing chamber, F. Diffusion chamber. Detailed Implementation

[0049] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the invention.

[0050] After extensive and in-depth research, the applicant of this invention discovered that treating ammonia oxime wastewater with a multi-element, high-efficiency extractant can overcome the high cost of existing ammonia oxime wastewater treatment processes. Simultaneously, setting up a multi-stage high-efficiency mixing separator for extraction, employing processes such as jet mixing, static mixing, gravity sedimentation separation, and coalescence separation, can improve the extraction efficiency of ammonia oxime wastewater. Furthermore, the device can increase the wastewater treatment speed by setting up multiple sets of jet mixing single tubes. In addition, the wastewater treatment device can be configured for multi-stage extraction to further increase extraction efficiency. Figure 1 This is a schematic diagram of the process flow of a method and apparatus for treating ammonia oxime wastewater according to a preferred embodiment of the present invention. The wastewater treatment apparatus includes: buffer tanks (1)(3)(4)(6), mixing and separation tank (2), and static mixing tank (5), wherein the mixing and separation tank contains a jet mixing component (2-1), a static mixing component (2-2), and a coalescing separation component (2-3). The ammonia oxime wastewater to be treated is first mixed with a certain amount of acid in the buffer tank (1) to adjust the pH. The acidified wastewater enters the main inlet (A) of the jet mixing component in the mixing and separation tank. The wastewater is subjected to negative pressure through the nozzle (C) of the jet mixer, and the extractant is absorbed into the suction chamber (D) by the negative pressure through the secondary inlet (B) of the jet mixer. After being fully mixed with the wastewater in the mixing chamber, it is then mixed a second time by the static mixing component. Finally, it is separated by the coalescing separation component. After separation, the raffinate phase (wastewater phase) flows out through the heavy phase port, while the extract phase flows out through the light phase port to the static mixing tank to mix with the back-extractant for back-extraction. The back-extracted extractant is then recycled.

[0051] Example 1

[0052] The method and apparatus of this invention were tested in a wastewater extraction treatment experiment at a cyclohexanone oxime production line of a company in Baling. The COD content of the wastewater was measured to be 7000 mg / L. The specific implementation steps are as follows:

[0053] 1) Filter the 20t / h cyclohexanone oxime wastewater to remove solid precipitates, and then mix it with 0.5t / h hydrochloric acid solution (pH 2-3). After acidification, the pH of the wastewater is 5.

[0054] 2) The wastewater treated in step 1) is introduced into a mixing and separation tank (the mixing tank contains 4 extraction mixers), and a multi-element extractant is simultaneously introduced for thorough mixing and extraction at a flow rate of 5 t / h. Inside the mixing and separation tank, the upper layer is the organic phase extract, containing the extractant and organic components, and the lower layer is the aqueous phase raffinate, i.e., the extracted ammonia oxime wastewater.

[0055] 3) The organic phase extract obtained in step 2) is introduced into a static mixing tank, while a sodium hydroxide solution is simultaneously introduced as a back-extraction agent for extractant regeneration. The fresh alkali solution comprises 8-10% at a flow rate of 0.1 t / h, and the circulating flow rate of the sodium hydroxide solution is 1 t / h (pH 10-12). After back-extraction, 0.1 t / h of waste alkali solution is sent to the wastewater treatment system, and the remaining alkali solution is pumped back to the back-extraction agent buffer tank for recycling. The purity of the regenerated extractant is above 97.7%, allowing for reuse.

[0056] 4) The COD of the extracted ammonia oxime wastewater obtained in step 2) was measured. The COD removal rate of the wastewater reached 60%, and it was discharged in compliance with standards after subsequent treatment by the biochemical device.

[0057] Example 2

[0058] In this embodiment, the wastewater to be treated comes from laboratory-prepared cyclohexanone oxime wastewater, and the COD content of the wastewater was measured to be 5000 mg / L. The specific implementation steps are as follows:

[0059] 1) After filtering and precipitating the 2t / h cyclohexanone oxime wastewater, add 40kg / h of hydrochloric acid solution (pH 2-3) to acidify it to pH 5.5;

[0060] 2) The wastewater treated in step 1) is introduced into a mixing and separation tank (the mixing tank contains two extraction mixers), and a multi-element extractant is simultaneously introduced for thorough mixing and extraction at a flow rate of 0.5 t / h. Inside the mixing and separation tank, the upper layer is the organic phase extract, containing the extractant and organic components, and the lower layer is the aqueous phase raffinate, i.e., the extracted ammonia oxime wastewater.

[0061] 3) The organic phase extract from step 2) is introduced into a static mixing tank, while a sodium hydroxide solution is simultaneously introduced as a back-extraction agent for regeneration. The fresh alkali solution comprises 8-10% of the extract, with a flow rate of 10 kg / h, and the sodium hydroxide solution is circulated at a flow rate of 0.1 t / h (pH 10-12). After back-extraction, 10 kg / h of waste alkali solution is sent to the wastewater treatment system, and the remaining alkali solution is pumped back to the back-extraction agent buffer tank for recycling. The purity of the regenerated extractant is above 98.1%, allowing for reuse.

[0062] 4) The COD of the extraction wastewater after ammonia oxime treatment in step 2) was measured. The COD removal rate of the wastewater reached 70%, and it was discharged in compliance with standards after subsequent treatment by the biochemical device.

[0063] Example 3

[0064] The method and apparatus of this invention were tested in a wastewater extraction treatment experiment at a cyclohexanone oxime production line of a company in Tianjin. The COD content of the wastewater was measured to be 5500 mg / L. The specific implementation steps are as follows:

[0065] 1) The 60t / h cyclohexanone oxime wastewater was filtered to remove solid precipitates, and then mixed with 1.5t / h hydrochloric acid solution (pH 2-3). After acidification, the pH of the wastewater was 5.

[0066] 2) The wastewater treated in step (1) is introduced into a parallel mixing and separation tank, which is obtained by connecting three individual mixing and separation tanks in parallel. Each individual mixing and separation tank has four extraction mixers. At the same time, a multi-element extractant is introduced for thorough mixing and extraction, with an extractant flow rate of 15 t / h. In the mixing and separation tank, the upper layer is the organic phase extract, which contains the extractant and organic components, and the lower layer is the aqueous phase raffinate, which is the extracted ammonia oxime wastewater.

[0067] 3) The organic phase extract from step 2) is introduced into a static mixing tank, while a sodium hydroxide solution is simultaneously introduced as a back-extraction agent for regeneration. The fresh alkali solution comprises 8-10% at a flow rate of 0.3 t / h, and the circulating flow rate of the sodium hydroxide solution is 3 t / h (pH 10-12). After back-extraction, 0.3 t / h of waste alkali solution is sent to the wastewater treatment system, and the remaining alkali solution is pumped back to the back-extraction agent buffer tank for recycling. The purity of the regenerated extractant is above 97.1%, allowing for reuse.

[0068] 4) The COD of the extraction wastewater after ammonia oxime treatment in step 2) was measured. The COD removal rate of the wastewater reached 65%, and it was discharged in compliance with standards after subsequent treatment by the biochemical device.

Claims

1. An apparatus for treating ammonia oxime wastewater, characterized in that: The system includes an acidic buffer tank (1), a mixing and separation tank (2), an extractant buffer tank (4), a back-extractant buffer tank (6), an alkaline buffer tank (3), a static mixing tank (5), and an extraction mixer inside the mixing and separation tank. The outlet of the acidic buffer tank (1) is connected to the main inlet of the extraction mixer via a pipeline. The top opening of the mixing and separation tank (2), the static mixing tank (5), the alkaline buffer tank (3), and the extractant buffer tank (4) are connected in series via pipelines. The bottom outlet of the alkaline buffer tank (3), the back-extractant buffer tank (6), and the side inlet of the static mixing tank are connected in series via pipelines. The extraction mixer includes a jet mixing component (2-1) and a static mixing component (2-2); the jet mixing component includes a main flow inlet (A), a secondary flow inlet (B), a suction chamber (D), a jet mixing chamber (E), and a diffusion chamber (F); the main flow inlet (A), the suction chamber (D), the jet mixing chamber (E), and the diffusion chamber (F) are sequentially connected along the central axis, and the secondary flow inlet (B) is horizontally opened above the suction chamber; the static mixing component is equipped with a static mixer and an opening; The main inlet is also equipped with a nozzle, which is a tapered nozzle with an opening height lower than that of the secondary inlet. The mixing and separating tank (2) has top and bottom openings and includes a coalescing separation component and n extraction mixers inside; the coalescing separation component (2-3) is located below the extraction mixers; the number of extraction mixers n≥2.

2. The apparatus for treating ammonia oxime wastewater according to claim 1, characterized in that: The static mixer is at least one of the following types: SX, SV, SH, SL, SK, and SD.

3. The apparatus for treating ammonia oxime wastewater according to claim 2, characterized in that: The opening is a circular opening, located below the static mixer.

4. The apparatus for treating ammonia oxime wastewater according to claim 1, characterized in that: The coalescing and separating component is woven from oleophilic fibers with a diameter of 10-500 μm.

5. The apparatus for treating ammonia oxime wastewater according to claim 4, characterized in that: The oleophilic fiber is at least one of polytetrafluoroethylene fiber, polypropylene fiber, polyamide fiber, and polyester fiber.

6. A method for treating ammonia oxime wastewater, characterized in that: The procedure is performed by the apparatus described in any one of claims 1 to 5.

7. The method for treating ammonia oxime wastewater according to claim 6, characterized in that: The pH of the ammonia oxime wastewater was adjusted by mixing it with acid to obtain acidified wastewater. The acidified wastewater was then extracted with a multi-element extractant to obtain an aqueous phase and an organic phase. The organic phase was then mixed with a back-extractant to recover the extractant.

8. The method for treating ammonia oxime wastewater according to claim 7, characterized in that: The pH of the acidified wastewater is 2-5; the multi-element extractant is composed of cyclohexane, toluene, ethyl acetate, dichloromethane and tributyl phosphate.

9. The method for treating ammonia oxime wastewater according to claim 7, characterized in that: The back-extraction agent is an alkaline solution.

10. The method for treating ammonia oxime wastewater according to claim 7, characterized in that: The back-extraction agent is a Lewis base solution.

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