Micro-interface catalytic oxidation pretreatment device for chemical raw material medicine production wastewater

Abstract

The invention discloses a micro-interface catalytic oxidation pretreatment device for chemical bulk drug production wastewater in the technical field of chemical sewage treatment, and the micro-interface catalytic oxidation pretreatment device comprises a reaction tank and an upper bubble tank, the upper bubble tank is fixedly mounted at the upper end of the reaction tank, a micro-bubble generation device is arranged in the upper bubble tank, and a liquid guide nozzle is arranged at the lower end of the upper bubble tank; a clear water ingress pipe is arranged on one side of the upper bubble tank, a gas ingress pipe is fixedly mounted at the upper end of the clear water ingress pipe, an inner reaction layer is arranged in the reaction tank, a closed inner cavity is formed between the inner reaction layer and the reaction tank, an outer connecting pipe is arranged at the upper end of the inner cavity, and gas can be input into the inner cavity through the outer connecting pipe; according to the ultrasonic micro-bubble generation device, oxidizing agent gas is crushed in clear water, and then the clear water containing micro-bubbles is guided into sewage, so that the ultrasonic micro-bubble generation device can be suitable for high-concentration sewage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of chemical wastewater treatment, in particular to a micro-interface catalytic oxidation pretreatment device for chemical raw material production wastewater. BACKGROUND

[0002] When treating wastewater by traditional oxidation technology, the oxidant (such as oxygen, ozone) enters the water in the form of millimeter-sized bubbles. The bubbles are large and rise quickly, and the contact area with wastewater is small, like "dragonfly water", most of the oxidant has not had time to react and escapes, and the oxygen utilization rate is often less than 30%. The micro-interface technology can disperse the oxidant into 10-1000 nanometer micro-bubbles through ultrasonic, high pressure homogenization and other methods - equivalent to disassembling 1 ordinary bubble into millions of micro-bubbles, and the gas-liquid contact area is instantly increased by 100-1000 times. These micro-bubbles can stay in the water for a longer time, and can also actively "shuttle" around the pollutants, greatly increasing the "meeting probability" of oxidants and organic matter to improve the utilization rate of oxidants.

[0003] The existing micro-bubble generating device has two ways of ultrasonic crushing type micro-bubble generating device and high pressure homogenization type micro-bubble generating device. The ultrasonic crushing type micro-bubble generating device improves the ultrasonic wave to crush the gas, and the high pressure homogenization type micro-bubble generating device improves the pressure to crush the bubble. The ultrasonic crushing method is relatively more uniform in micro-bubble particle size, smaller in bubble particle size, and lower in required energy consumption than the high pressure crushing method, but the ultrasonic transducer in the ultrasonic crushing method is easily worn by impurities in the water, with a service life of about 2000-3000h. When treating high-viscosity wastewater, the sound wave energy attenuates quickly, and the bubble crushing effect decreases, which is not suitable for high-concentration waste. SUMMARY

[0004] The technical problem of the present application is to provide a micro-interface catalytic oxidation pretreatment device for chemical raw material production wastewater and a method thereof. In the present application, the oxidant gas is crushed in clean water, and the clean water containing micro-bubbles is introduced into the sewage, so that the ultrasonic micro-bubble generating device can be suitable for high-concentration sewage.

[0005] In order to achieve the above object, the present application provides the following technical scheme: a micro-interface catalytic oxidation pretreatment device for chemical bulk drug production wastewater, comprising a reaction tank and an upper bubble tank, the upper bubble tank is fixedly installed at the upper end of the reaction tank, a micro-bubble generating device is arranged in the upper bubble tank, a liquid guide nozzle is arranged at the lower end of the upper bubble tank, the lower end of the liquid guide nozzle is introduced into the reaction tank, a clean water introduction pipe is arranged on one side of the upper bubble tank, and a gas introduction pipe is fixedly installed at the upper end of the clean water introduction pipe, an inner reaction layer is arranged in the reaction tank, a closed inner cavity is formed between the inner reaction layer and the reaction tank, an outer connecting pipe is arranged at the upper end of the inner cavity, the outer connecting pipe can input gas into the inner cavity, and a transmission assembly is arranged in the inner reaction layer, the transmission assembly can drive the bubbles output from the liquid guide nozzle to move to the bottom of the inner reaction layer.

[0006] As a further scheme of the present application, the transmission assembly comprises a liquid guide fan, an outer feeding pipe and an inner feeding pipe, the outer feeding pipe is located at the middle position of the inner reaction layer, the inner feeding pipe is sleeved inside the outer feeding pipe, the upper end of the inner feeding pipe is arranged below the liquid guide nozzle, a spiral feeding blade is rotatably installed inside the inner feeding pipe, water seepage holes are formed in the outer feeding pipe and the inner feeding pipe, and when the water seepage holes in the outer feeding pipe and the inner feeding pipe coincide, water in the inner feeding pipe can overflow from the water seepage holes to the outside of the outer feeding pipe.

[0007] As a further scheme of the present application, a plurality of side mounting racks are linearly and symmetrically arranged outside the outer feeding pipe, a liquid guide fan is rotatably installed on each side mounting rack, mounting seats are arranged at the lower ends of the outer feeding pipe and the inner feeding pipe, the outer feeding pipe is rotatably connected to the upper surface of the mounting seat, the inner feeding pipe is fixedly installed on the upper surface of the mounting seat, an inner rotating motor is fixedly installed in the mounting seat, the output end of the inner rotating motor is fixedly connected with the spiral feeding blade, and the bottom of the mounting seat is fixedly connected with the bottom of the reaction tank.

[0008] As a further scheme of the present application, the micro-bubble generating device comprises a connecting frame and ultrasonic transducers, a plurality of ultrasonic transducers are fixedly installed on the connecting frame to form a group of crushing units, two groups of crushing units are arranged in parallel in the upper bubble tank and are symmetrically arranged above and below, an upper porous titanium plate is arranged on the upper side of the two groups of crushing units, and a lower porous titanium plate is arranged on the lower side of the two groups of crushing units, and the upper porous titanium plate and the lower porous titanium plate are fixedly connected with the inner wall of the upper bubble tank.

[0009] As a further scheme of the present application, a control valve is fixedly installed at the lower end of the liquid guide nozzle, the control valve is a one-way valve and can enable the liquid in the upper bubble tank to enter the inner reaction layer.

[0010] As a further embodiment of the present invention, the connecting frame is composed of two sets of grid-shaped hollow frames, and the ultrasonic transducers are equidistantly distributed on the connecting frame. The center points of every four sets of ultrasonic transducers can be connected to form an equilateral rectangle.

[0011] As a further embodiment of the present invention, a support base is fixedly installed on the lower surface of the reaction tank, and a sewage inlet pipe is fixedly installed at the bottom of the reaction tank, so that the wastewater to be treated can enter the inner reaction layer through the sewage inlet pipe.

[0012] As a further embodiment of the present invention, the inner reaction layer is a silicone elastic layer, the upper end of the inner reaction layer is fixedly connected to the lower surface of the liquid guide nozzle, and when the outer connecting tube inputs gas into the inner cavity, the inner reaction layer can be made to contract towards the middle.

[0013] As a further embodiment of the present invention, each of the external feeding tubes is fixedly installed with a micro motor, the output end of the micro motor is fixedly connected to the liquid guiding fan, and a first motor is provided in the mounting base, the first motor driving the external feeding tube to rotate through a transmission gear.

[0014] As a further embodiment of the present invention, regulating valves are fixedly installed on the external connecting pipe, the clean water inlet pipe and the gas inlet pipe, and a pressure sensor is fixedly installed in the inner cavity.

[0015] Compared with the prior art, the beneficial effects of the present invention are: In this invention, clean water containing a large number of microbubbles enters the reaction tank through a liquid guide nozzle, thereby introducing the broken microbubbles into the wastewater. The microbubble generator is located in the upper bubble tank and only comes into contact with the clean water, not directly with the wastewater. This avoids the wear of the ultrasonic transducer by the wastewater, increases the service life of the equipment, and ensures that the equipment's operation is not affected by the concentration and viscosity of the wastewater. The microbubble breaking effect on the gas can be kept consistent, avoiding the problem of previous microbubble devices being located at the bottom of the reaction tank and thus being affected by the concentration and viscosity of the wastewater, which weakened the microbubble breaking effect. This ensures the stability of the microbubble generator's performance.

[0016] The upper bubble tank in the application is at the upper end of the reaction tank, and the clean water containing micro-bubbles flows from top to bottom to the bottom of the inner reaction layer under the action of the transmission assembly. Different from the previous way of arranging the micro-bubble generating device at the bottom of the reaction tank, in this case, the bubbles move from bottom to top under the action of buoyancy. During the upward movement, the horizontal and vertical bubbles gradually increase in particle size due to the decrease in water pressure, so that the particle size of the oxidant bubbles in the upper part of the sewage reaction tank is larger than the original particle size of the micro-bubbles, which makes the contact between the upper layer of sewage and the oxidant insufficient, and still reduces the utilization rate of the oxidant. In the application, the micro-bubbles move to the bottom of the reaction tank with the clean water, and the water pressure increases with the downward movement of the micro-bubbles. The particle size of the micro-bubbles gradually decreases instead of gradually increases, which further increases the contact area between the oxidant gas and the sewage, thereby improving the utilization rate of the oxidant and reducing the waste of the oxidant. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0018] Figure 1 It is a schematic view of the overall structure of the application. Figure 2 It is a structural section view of the application. Figure 3 It is a structural section view of the upper bubble tank in the application. Figure 4 It is a schematic view of the structure of the ultrasonic vibrator in the application. Figure 5 It is a schematic view of the structure of the transmission assembly in the application. Figure 6 It is a structural section view of the transmission assembly in the application.

[0019] In the drawings, the components represented by each number are listed as follows: 1, upper bubble tank; 2, reaction tank; 3, support seat; 4, sewage inlet pipe; 5, outer connecting pipe; 6, clean water inlet pipe; 7, gas inlet pipe; 8, connecting frame; 9, ultrasonic vibrator; 10, liquid guide nozzle; 11, inner reaction layer; 12, control valve; 13, upper porous titanium plate; 14, lower porous titanium plate; 15, liquid guide fan; 16, inner cavity; 17, side mounting frame; 18, outer feeding pipe; 19, inner feeding pipe; 20, water seepage hole; 21, spiral feeding blade; 22, inner rotating motor; 23, mounting seat. DETAILED DESCRIPTION

[0020] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0021] Please refer to Figures 1-6 The present application provides a technical solution: a micro-interface catalytic oxidation pretreatment device for chemical bulk drug production wastewater, comprising a reaction tank 2 and an upper bubble tank 1, the upper bubble tank 1 is fixedly installed at the upper end of the reaction tank 2, a micro-bubble generating device is arranged in the upper bubble tank 1, a liquid guide nozzle 10 is arranged at the lower end of the upper bubble tank 1, the lower end of the liquid guide nozzle 10 is introduced into the reaction tank 2, a clean water guide pipe 6 is arranged on one side of the upper bubble tank 1, and a gas guide pipe 7 is fixedly installed at the upper end of the clean water guide pipe 6, an inner reaction layer 11 is arranged in the reaction tank 2, a closed inner cavity 16 is formed between the inner reaction layer 11 and the reaction tank 2, an outer connecting pipe 5 is arranged at the upper end of the inner cavity 16, the outer connecting pipe 5 can input gas into the inner cavity 16, a transmission assembly is arranged in the inner reaction layer 11, and the transmission assembly can drive the bubbles output from the liquid guide nozzle 10 to move to the bottom of the inner reaction layer 11.

[0022] In operation, sewage is treated in the reaction tank 2, and oxidant gas is introduced into the upper bubble tank 1 through the gas introduction pipe 7, and at the same time, clean water is introduced into the upper bubble tank 1 through the clean water introduction pipe 6, the oxidant gas is mixed with the clean water, and under the action of the micro-bubble generating device, the oxidant gas is broken by ultrasonic waves, so that the gas is dispersed into micro-bubbles, and the bubble particle size can be controlled in 50-500nm, the clean water containing a large amount of micro-bubbles enters the reaction tank 2 through the liquid guide nozzle 10, so that the broken micro-bubbles are input into the sewage, and the micro-bubble generating device is only in contact with the clean water in the upper bubble tank 1, not directly in contact with the sewage, so as to avoid the abrasion of the ultrasonic vibrator 9 by the sewage, increase the service life of the equipment, and the equipment operation is not affected by the concentration and viscosity of the sewage, the breaking effect of the micro-bubbles on the gas can be kept consistent, avoiding the problem that the micro-bubble device is arranged at the bottom of the reaction tank 2, which is affected by the concentration and viscosity of the sewage, so that the breaking effect of the micro-bubbles is weakened, and the stability of the micro-bubble generating device is ensured. In the present application, the upper bubble tank 1 is located at the upper end of the reaction tank 2, and the clean water containing micro-bubbles flows from top to bottom to the bottom of the inner reaction layer 11 under the action of the transmission assembly, which is different from the way that the micro-bubble generating device is arranged at the bottom of the reaction tank 2. Under this condition, the bubbles move from bottom to top under the action of buoyancy, and the horizontal and vertical bubbles gradually increase in size during the upward movement, so that the oxidant bubble particle size at the upper part of the sewage reaction tank 2 is larger than the original particle size of the micro-bubbles, so that the contact between the upper layer of sewage and the oxidant is not sufficient, and the utilization rate of the oxidant is still reduced. In the present application, the micro-bubbles move to the bottom of the reaction tank 2 with the clean water, and as the micro-bubbles move downward, the water pressure continuously increases, and the micro-bubble particle size gradually decreases from large to small, further increasing the contact area between the oxidant gas and the sewage, thereby improving the utilization rate of the oxidant and reducing the waste of the oxidant.

[0023] As a further scheme of the present application, the transmission assembly comprises a liquid guide fan 15, an outer feeding pipe 18 and an inner feeding pipe 19, the outer feeding pipe 18 is located at the middle position of the inner reaction layer 11, the inner feeding pipe 19 is sleeved inside the outer feeding pipe 18, the upper end of the inner feeding pipe 19 is arranged below the liquid guide nozzle 10, a spiral feeding blade 21 is rotatably installed inside the inner feeding pipe 19, and water seepage holes 20 are formed on the outer feeding pipe 18 and the inner feeding pipe 19.

[0024] In operation, the clean water containing micro-bubbles in the present application is input into the inner feeding pipe 19 through the liquid guide nozzle 10. The clean water containing micro-bubbles is moved gradually to the bottom of the inner reaction layer 11 under the rotation of the spiral feeding blade 21 in the inner feeding pipe 19. In the process of the downward movement of the clean water containing micro-bubbles, the outer feeding pipe 18 rotates repeatedly. When the outer feeding pipe 18 is coincided with the water seepage hole 20 on the inner feeding pipe 19, the clean water containing micro-bubbles can overflow from the water seepage hole 20 of the coincided outer feeding pipe 18 and inner feeding pipe 19 to the outside of the outer feeding pipe 18, so that the oxidant bubbles are uniformly diffused in the sewage layer at different heights of the inner reaction layer 11 in the process of the downward movement of the clean water containing micro-bubbles.

[0025] As a further scheme of the present application, a plurality of groups of side mounting frames 17 are linearly and symmetrically arranged outside the outer feeding pipe 18, and the liquid guide fan 15 is rotatably mounted on each side mounting frame 17. The lower end of the outer feeding pipe 18 and the inner feeding pipe 19 is provided with a mounting seat 23. The outer feeding pipe 18 is rotatably connected to the upper surface of the mounting seat 23, and the inner feeding pipe 19 is fixedly mounted on the upper surface of the mounting seat 23. The inner rotating motor 22 is fixedly mounted in the mounting seat 23, and the output end of the inner rotating motor 22 is fixedly connected with the spiral feeding blade 21. The bottom of the mounting seat 23 is fixedly connected with the bottom of the reaction tank 2.

[0026] In operation, the liquid guide fan 15 rotates under the water resistance when the outer feeding pipe 18 rotates, so that the clean water containing micro-bubbles overflowing from the outer feeding pipe 18 is diffused horizontally, so that the clean water containing micro-bubbles is more uniformly distributed in the sewage. In the present application, the spiral feeding blade 21 is driven to rotate by the inner rotating motor 22.

[0027] As a further scheme of the present application, the micro-bubble generating device comprises a connecting frame 8 and an ultrasonic vibrator 9. A plurality of groups of ultrasonic vibrators 9 are fixedly mounted on the connecting frame 8 to form a group of crushing units. Two groups of crushing units are arranged in parallel in the upper bubble tank 1, and the two groups of crushing units are arranged symmetrically up and down. An upper multi-hole titanium plate 13 is arranged on the upper side of the two groups of crushing units, and a lower multi-hole titanium plate 14 is arranged on the lower side. The upper multi-hole titanium plate 13 and the lower multi-hole titanium plate 14 are fixedly connected with the inner wall of the upper bubble tank 1.

[0028] In operation, the upper multi-hole titanium plate 13 and the lower multi-hole titanium plate 14 (pore diameter 10-50 μm) arranged up and down uniformly disperse the oxidant gas into "micron-sized small bubbles", providing "initial raw materials" for ultrasonic crushing, avoiding the gas directly entering in the form of large bubbles, and then crushing the gas by the ultrasonic vibrator 9 outputting ultrasonic waves.

[0029] As a further scheme of the present application, the lower end of the liquid guide nozzle 10 is fixedly mounted with a control valve 12. The control valve 12 is a one-way valve which can make the liquid in the upper bubble tank 1 enter into the inner reaction layer 11.

[0030] During operation, the bottom of the liquid guide nozzle 10 of this invention opens the control valve 12, and the control valve 12 inputs the clean water containing microbubbles at the bottom of the liquid guide nozzle 10 into the inner feed pipe 19.

[0031] As a further embodiment of the present invention, the connecting frame 8 is composed of two sets of grid-shaped hollow frames, and the ultrasonic transducers 9 are equidistantly distributed on the connecting frame 8. The center points of every four sets of ultrasonic transducers 9 can be connected to form an equilateral rectangle.

[0032] During operation, the connecting frame 8 of this invention is provided with multiple sets of mounting holes, and the ultrasonic transducer 9 is fixedly mounted on the connecting frame 8 by bolts.

[0033] As a further embodiment of the present invention, a support base 3 is fixedly installed on the lower surface of the reaction tank 2, and a sewage inlet pipe 4 is fixedly installed at the bottom of the reaction tank 2, so that the wastewater to be treated can enter the inner reaction layer 11 through the sewage inlet pipe 4.

[0034] During operation, wastewater in this invention enters the inner reaction layer 11 through the wastewater inlet pipe 4 via a suction pump. The support base 3 at the bottom of the reaction tank 2 provides installation space at the bottom.

[0035] As a further embodiment of the present invention, the inner reaction layer 11 is a silicone elastic layer, and the upper end of the inner reaction layer 11 is fixedly connected to the lower surface of the liquid guide nozzle 10. When the outer connecting tube 5 inputs gas into the inner cavity 16, the inner reaction layer 11 can be made to contract towards the middle.

[0036] During operation, after gas is introduced into the inner cavity 16 of this invention, the gas pressure in the inner cavity 16 increases, thereby increasing the pressure on the side wall of the inner reaction layer 11. The increased pressure causes the microbubbles inside the inner reaction layer 11 to break further under the pressure.

[0037] As a further embodiment of the present invention, a micro motor is fixedly installed inside the external feeding pipe 18, and the output end of the micro motor is fixedly connected to the liquid guiding fan 15. A first motor is provided in the mounting base 23, and the first motor drives the external feeding pipe 18 to rotate through the transmission gear.

[0038] During operation, the micro motor drive in this invention serves as an auxiliary drive for the rotation of the liquid guide fan 15. The micro motor drives the liquid guide fan 15 to rotate, while the first motor inside the mounting base 23 drives the external feeding pipe 18 to rotate through the meshing gear ring.

[0039] As a further embodiment of the present invention, regulating valves are fixedly installed on the external connecting pipe 5, the clean water inlet pipe 6 and the gas inlet pipe 7, and a pressure sensor is fixedly installed in the inner cavity 16.

[0040] During operation, the pressure sensor in this invention can detect the pressure inside the inner cavity 16, so that the user can adjust the pressure accordingly.

Claims

1. A micro-interface catalytic oxidation pretreatment device for chemical bulk drug production wastewater, comprising a reaction tank (2) and an upper bubble tank (1), characterized in that: The upper bubble tank (1) is fixedly installed at the upper end of the reaction tank (2), the micro-bubble generating device is arranged in the upper bubble tank (1), the lower end of the upper bubble tank (1) is provided with a liquid guide nozzle (10), the lower end of the liquid guide nozzle (10) is introduced into the reaction tank (2), one side of the upper bubble tank (1) is provided with a clean water guide pipe (6), and the upper end of the clean water guide pipe (6) is fixedly installed with a gas guide pipe (7), the inner reaction layer (11) is arranged in the reaction tank (2), the inner reaction layer (11) and the reaction tank (2) form a closed inner cavity (16), the upper end of the inner cavity (16) is provided with an outer connecting pipe (5), the outer connecting pipe (5) can input gas into the inner cavity (16), and the inner reaction layer (11) is provided with a transmission assembly.

2. The micro-interface catalytic oxidation pretreatment device for chemical bulk drug production wastewater according to claim 1, characterized in that: The transmission assembly comprises a liquid guide fan (15), an outer feeding pipe (18) and an inner feeding pipe (19), the outer feeding pipe (18) is located at the middle position of the inner reaction layer (11), the inner feeding pipe (19) is sleeved in the outer feeding pipe (18), the upper end of the inner feeding pipe (19) is arranged below the liquid guide nozzle (10), the spiral feeding blade (21) is rotatably installed in the inner feeding pipe (19), the outer feeding pipe (18) and the inner feeding pipe (19) are both provided with water seepage holes (20), when the water seepage holes (20) on the outer feeding pipe (18) and the inner feeding pipe (19) coincide, the water in the inner feeding pipe (19) can overflow to the outside of the outer feeding pipe (18) from the water seepage holes (20). 3.The micro-interface catalytic oxidation pretreatment device for chemical bulk drug production wastewater according to claim 2, characterized in that: The outer side of the outer feeding pipe (18) is linearly and symmetrically provided with a plurality of side mounting racks (17), the liquid guide fan (15) is rotatably installed on the side mounting rack (17), the lower ends of the outer feeding pipe (18) and the inner feeding pipe (19) are provided with a mounting seat (23), the outer feeding pipe (18) is rotatably connected with the upper surface of the mounting seat (23), the inner feeding pipe (19) is fixedly installed on the upper surface of the mounting seat (23), the inner rotating motor (22) is fixedly installed in the mounting seat (23), the output end of the inner rotating motor (22) is fixedly connected with the spiral feeding blade (21), and the bottom of the mounting seat (23) is fixedly connected with the bottom of the reaction tank (2).

4. The micro-interface catalytic oxidation pretreatment device for chemical bulk drug production wastewater according to claim 3, characterized in that: The micro-bubble generating device comprises a connecting frame (8) and an ultrasonic vibrator (9), a plurality of ultrasonic vibrators (9) are fixedly installed on the connecting frame (8) to form a crushing unit, two crushing units are arranged in parallel in the upper bubble tank (1) and symmetrically arranged above and below, an upper multi-hole titanium plate (13) is arranged on the upper side of the two crushing units, and a lower multi-hole titanium plate (14) is arranged on the lower side of the two crushing units, and the upper multi-hole titanium plate (13) and the lower multi-hole titanium plate (14) are fixedly connected with the inner wall of the upper bubble tank (1).

5. The micro-interface catalytic oxidation pretreatment device for chemical bulk drug production wastewater according to claim 1, characterized in that: The lower end of the liquid guide nozzle (10) is fixedly installed with a control valve (12), which is a one-way valve capable of allowing the liquid in the upper bubble tank (1) to enter the inner reaction layer (11).

6. The micro-interface catalytic oxidation pretreatment device for chemical bulk drug production wastewater according to claim 4, characterized in that: The connecting frame (8) is composed of two groups of hollow frames, and the ultrasonic vibrators (9) are equidistantly distributed on the connecting frame (8). Every four groups of the center points of the ultrasonic vibrators (9) are connected to form an equilateral rectangle.

7. The micro-interface catalytic oxidation pretreatment device for chemical bulk drug production wastewater according to claim 1, characterized in that: The lower surface of the reaction tank (2) is fixedly installed with a support seat (3), and the bottom of the reaction tank (2) is fixedly installed with a sewage guide pipe (4), so that the wastewater to be treated can enter the inner reaction layer (11) through the sewage guide pipe (4).

8. The micro-interface catalytic oxidation pretreatment device for chemical bulk drug production wastewater according to claim 3, characterized in that: The inner reaction layer (11) is a silica gel elastic layer, the upper end of the inner reaction layer (11) is fixedly connected with the lower surface of the liquid guide nozzle (10), and when the outer connecting pipe (5) inputs gas into the inner cavity (16), the inner reaction layer (11) can be contracted to the middle.

9. The micro-interface catalytic oxidation pretreatment device for chemical bulk drug production wastewater according to claim 3, characterized in that: Miniature motors are fixedly installed in the outer feeding pipes (18), the output ends of the miniature motors are fixedly connected with the liquid guide fans (15), a first motor is arranged in the mounting seat (23), and the first motor drives the outer feeding pipes (18) to rotate through a transmission gear. 10.The micro-interface catalytic oxidation pretreatment device for chemical bulk drug production wastewater according to claim 1, characterized in that: Adjusting valves are fixedly installed on the outer connecting pipe (5), the clear water guide pipe (6) and the gas guide pipe (7), and a gas pressure sensor is fixedly installed in the inner cavity (16).

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