Catalytic oxidation advanced treatment process and device for printing and dyeing wastewater

Abstract

The application discloses a kind of catalytic oxidation advanced treatment process and processing device of printing and dyeing wastewater, it is related to industrial wastewater treatment technical field, solve the printing and dyeing sewage and multielement ion mixed gas contact time short under the pipeline conveying state, it is difficult to completely uniform mixed reaction, to affect the technical problem of sewage treatment effect;Among them, the processing device includes reaction box, sewage pipe fittings and be used for conveying multielement ion mixed gas main gas inlet pipe, it is characterized in that, sewage pipe fittings are used for after printing and dyeing wastewater and multielement ion mixed gas mixed reaction introduction into reaction box, main gas inlet pipe and reaction box inner chamber are equipped with gas-liquid remixing mechanism.The application makes multielement ion mixed gas and sewage carry out multistage mixed contact, to realize sufficient uniform mixed reaction, not only be favorable to improve the catalytic oxidation efficiency of wastewater, and be favorable to improve the processing quality of wastewater.

Description

Technical Field

[0001] This invention relates to the field of industrial wastewater treatment technology, specifically to a catalytic oxidation deep treatment process and device for dyeing and printing wastewater. Background Technology

[0002] Textile dyeing and printing wastewater is generated during the textile dyeing and printing process. This type of wastewater contains various pollutants, including but not limited to dyes, sizing agents, auxiliaries, oils, acids and alkalis, fiber impurities, sand, and inorganic salts. Due to the high water consumption in the dyeing and printing process (approximately 100 to 200 tons of water are consumed per ton of textiles produced), the wastewater is not only large in volume but also high in organic pollutants, dark in color, and highly alkaline. Furthermore, its quality varies significantly depending on the production batch and process. Direct discharge of untreated dyeing and printing wastewater can cause serious environmental pollution, such as affecting the ecological balance of aquatic bodies, harming human health, and damaging soil structure. Therefore, it needs to be treated using physical, chemical, or biological methods to remove harmful substances, reduce environmental impact, and promote water resource recycling.

[0003] Multi-element ion mixtures typically include hydroxyl radicals (·OH), ozone (O3), and hydroxide ions (OH-). - ), monooxygen (O) - ), hydrogen ions (H) + This method utilizes multi-element ion mixed gas catalytic oxidation technology to deeply treat dyeing and printing wastewater, containing atomic or ionic components such as oxygen (O2) and other elements, offering significant environmental and economic benefits. The method involves pre-mixing wastewater with a multi-element ion mixed gas before introducing it into a reaction tank for flocculation, sedimentation, and filtration, effectively improving pollutant removal rates. However, in actual operation, due to the large volume of dyeing and printing wastewater and the short contact time between the wastewater and the multi-element ion mixed gas during pipeline transport, it is difficult to achieve a completely uniform mixing reaction. This may not only reduce catalytic oxidation efficiency but also affect the final wastewater treatment quality. Summary of the Invention

[0004] The purpose of this invention is to provide a catalytic oxidation deep treatment process and device for dyeing and printing wastewater, which solves the problem that the short contact time between dyeing and printing wastewater and multi-ion mixed gas under pipeline transportation conditions makes it difficult to achieve a completely uniform mixing reaction, thus affecting the wastewater treatment effect.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A catalytic oxidation deep treatment device for dyeing and printing wastewater includes a reaction tank, a sewage pipe fitting, and a main inlet pipe for conveying a multi-element ion mixed gas. The sewage pipe fitting is used to mix and react the dyeing and printing wastewater with the multi-element ion mixed gas and then introduce it into the reaction tank. A gas-liquid remixing mechanism is installed between the main inlet pipe and the inner cavity of the reaction tank.

[0007] The gas-liquid remixing mechanism includes a secondary air inlet pipe, a first aeration mechanism, and multiple second aeration mechanisms. One end of the secondary air inlet pipe is connected to the side wall of the main air inlet pipe, and the secondary air inlet pipe is connected to the main air inlet pipe. The first and second aeration mechanisms are both installed inside the reaction chamber, and both the first and second aeration mechanisms are connected to the secondary air inlet pipe.

[0008] As a further aspect of the present invention: the reaction chamber is equipped with a plurality of staggered first and second partitions, the plurality of second partitions dividing the inner cavity of the reaction chamber from left to right into a left end cavity, a plurality of middle cavities and a right end cavity, the main air inlet pipe is connected to the left end cavity, the first aeration mechanism is installed in the left end cavity, and the plurality of second aeration mechanisms are respectively installed in the plurality of middle cavities.

[0009] As a further aspect of the present invention: the sewage pipe fitting includes a first inlet pipe, a gas-liquid mixer and a second inlet pipe, the first inlet pipe and the second inlet pipe are connected by the gas-liquid mixer, and the second inlet pipe is connected to the inner cavity of the reaction tank, and the main air inlet pipe is connected to the air inlet at the top of the gas-liquid mixer.

[0010] As a further aspect of the present invention: the first aeration mechanism includes an aerator and a first branch pipe. The aerator is installed between the inner wall of the reaction tank and the side wall of the first partition plate by a bracket. One end of the first branch pipe is connected to the air inlet end of the aerator, and the other end of the first branch pipe passes through the top of the reaction tank and is connected to the auxiliary air inlet pipe.

[0011] As a further embodiment of the present invention: the second aeration mechanism includes an outer serpentine tube, an inner serpentine tube, a second branch tube, several sets of aeration elements, and several sets of support elements. The outer serpentine tube is connected between the second partition and the upper side wall of the first partition, and one end of the outer serpentine tube penetrates the second partition. The inner serpentine tube is located inside the outer serpentine tube, and the inner serpentine tube is connected to the inner wall of the outer serpentine tube through several sets of support elements. The several sets of aeration elements are distributed along the trajectory of the inner serpentine tube. One end of the second branch tube is connected to the auxiliary air inlet pipe, and the other end of the second branch tube is connected to the inner serpentine tube.

[0012] As a further aspect of the present invention: the first water inlet pipe includes a first conduit, a tee, and a second conduit. The first conduit and the second conduit are respectively connected to both ends of the tee. The other end of the tee is connected to a return water pipe. One end of the return water pipe is connected to a pump body. The pump body is used to extract the treated water in the reaction tank.

[0013] As a further aspect of the present invention: a dosing port is provided at the top of the left end cavity, an exhaust port is provided at the top of the middle cavity, an overflow port is provided on the second partition of the right end cavity, and a water outlet with a water outlet valve is installed on the side wall of the right end cavity near the top.

[0014] As a further aspect of the present invention: a first grid is installed in the left end cavity, and a second grid, a first packing layer and a second packing layer are sequentially installed in the plurality of middle cavities. A drain outlet is installed on the side wall near the bottom of both the left end cavity and the middle cavity, and a mud guide plate symmetrical about the drain outlet is installed in both the left end cavity and the middle cavity.

[0015] As a further aspect of the present invention: the outer serpentine tube is open at both ends, the inner serpentine tube is sealed at both ends, each group of aeration elements consists of multiple aeration heads distributed circumferentially along the outer wall of the inner serpentine tube, and each group of support elements consists of multiple pillars distributed circumferentially along the outer wall of the inner serpentine tube.

[0016] A treatment process for a catalytic oxidation deep treatment device for dyeing and printing wastewater includes the following steps:

[0017] Step 1: Inject a multi-ion mixed gas for catalytic oxidation of dyeing and printing wastewater through the main air inlet pipe, and at the same time inject dyeing and printing wastewater through the sewage pipe fittings so that it merges and mixes with the multi-ion mixed gas and enters the left end cavity of the reaction chamber.

[0018] Step 2: The auxiliary air inlet pipe introduces a portion of the multi-element ion mixed gas into the first aeration mechanism in the left end cavity to aerate and oxidize the dyeing and printing wastewater again, while adding reagents for reaction and flocculation treatment.

[0019] Step 3: The second aeration mechanism gradually overflows the treated water in the left end chamber into multiple middle chambers. During the overflow process, the auxiliary air inlet pipe introduces multi-electrode ion mixed gas again for further oxidation reaction treatment.

[0020] Step 4: The water injected into the reaction tank gradually overflows from the left end chamber to multiple middle chambers. During the flow, sedimentation and filtration are carried out in each chamber. Finally, the treated water enters the right end chamber. If the test meets the standard, it is discharged; otherwise, it is returned to the sewage pipe for circulation treatment.

[0021] The beneficial effects of this invention are:

[0022] 1. In this invention, the wastewater to be treated is conveniently transported to the reaction tank through the sewage pipe fittings. The main air inlet pipe facilitates the mixing and reaction of the wastewater with the multi-electrode ion mixed gas before entering the reaction tank. The active ingredients in the multi-electrode ion mixed gas can undergo oxidation-reduction reactions with the organic matter in the wastewater, promoting the decomposition of organic matter, thereby effectively reducing the COD value and improving the wastewater treatment efficiency.

[0023] 2. In this invention, the multi-electrode ion mixed gas is conveniently introduced into the first and second aeration mechanisms in the reaction tank via the auxiliary air inlet pipe. The first aeration mechanism allows the dyeing wastewater to be mixed and reacted with the multi-electrode ion mixed gas again after entering the reaction tank. The second aeration mechanism not only facilitates the gradual overflow of the treated water in the reaction tank, but also allows the water to undergo further mixing and reaction with the multi-electrode ion mixed gas during the overflow process. This facilitates a thorough and uniform mixing reaction between the wastewater and the multi-electrode ion mixed gas, which not only improves the catalytic oxidation efficiency of the wastewater, but also effectively improves the treatment quality of the wastewater. Attached Figure Description

[0024] The invention will now be further described with reference to the accompanying drawings.

[0025] Figure 1 This is a first-view perspective perspective of a catalytic oxidation deep treatment device for dyeing and printing wastewater according to the present invention.

[0026] Figure 2 This is a second-view perspective perspective of a catalytic oxidation deep treatment device for dyeing and printing wastewater according to the present invention.

[0027] Figure 3 This is a three-dimensional view of the reaction tank after being cut open in the catalytic oxidation deep treatment device for dyeing and printing wastewater according to the present invention.

[0028] Figure 4 This is a perspective view of the connection between the sewage pipe and the main air inlet pipe in a catalytic oxidation deep treatment device for dyeing and printing wastewater according to the present invention.

[0029] Figure 5 This is a perspective view of the gas-liquid remixing mechanism in a catalytic oxidation deep treatment device for dyeing and printing wastewater according to the present invention.

[0030] Figure 6 This is a perspective view of the connection between the inner and outer serpentine tubes in a catalytic oxidation deep treatment device for dyeing and printing wastewater according to the present invention.

[0031] Figure 7 This is a perspective view of the connection between the inner serpentine pipe and the second branch pipe in a catalytic oxidation deep treatment device for dyeing and printing wastewater according to the present invention.

[0032] In the diagram: 1. Reaction chamber; 101. Left end cavity; 102. Middle cavity; 103. Right end cavity; 2. Sewage pipe fittings; 21. First inlet pipe; 211. First conduit; 212. T-joint; 213. Second conduit; 22. Gas-liquid mixer; 23. Second inlet pipe; 3. Main air inlet pipe; 4. Gas-liquid remixing mechanism; 41. Auxiliary air inlet pipe; 42. First aeration mechanism; 421. Aerator; 422. First branch pipe; 43. Second aeration mechanism; 431. Outer serpentine pipe; 432. Inner serpentine pipe; 433. Second branch pipe; 434. Aeration component; 435. Support component; 5. First baffle; 6. Second baffle; 7. Return water pipe; 8. Pump body; 9. Dosing port; 10. Exhaust port; 11. Overflow port; 12. Water outlet valve; 13. Water outlet; 14. First screen; 15. Second screen; 16. First packing layer; 17. Second packing layer; 18. Sewage outlet; 19. Sludge guide plate; 20. Electrically controlled valve. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] like Figure 1-7 As shown, the present invention is a catalytic oxidation deep treatment device for dyeing and printing wastewater, including a reaction tank 1, a sewage pipe 2, and a main inlet pipe 3 for conveying a multi-element ion mixed gas. The sewage pipe 2 is used to mix and react the dyeing and printing wastewater with the multi-element ion mixed gas and then introduce it into the reaction tank 1. A gas-liquid remixing mechanism 4 is installed between the main inlet pipe 3 and the inner cavity of the reaction tank 1. The gas-liquid remixing mechanism 4 includes a secondary inlet pipe 41, a first aeration mechanism 42, and multiple second aeration mechanisms 43. One end of the secondary inlet pipe 41 is connected to the side wall of the main inlet pipe 3, and the secondary inlet pipe 41 is connected to the main inlet pipe 3. The first aeration mechanism 42 and the second aeration mechanism 43 are both installed in the reaction tank 1, and both the first aeration mechanism 42 and the second aeration mechanism 43 are connected to the secondary inlet pipe 41.

[0035] It should be noted that during use, the chip generates various strong oxidizing substances through low-voltage cracking, including hydroxyl radicals (·OH), ozone (O3), and hydroxide ions (OH-). - ), monooxygen (O) - ), hydrogen ions (H) +The mixture of oxygen (O2) and multi-element atomic and ionic gases is injected into the main air inlet pipe 3 (the gas can be transported by a fan). At the same time, the dyeing and printing wastewater to be treated is transported through the sewage pipe fitting 2. During the transportation process, the wastewater is mixed and reacted with the multi-element ionic mixed gas, and then enters the reaction tank 1 for subsequent dosing reaction, flocculation sedimentation and filtration treatment.

[0036] Through the secondary air inlet pipe 41, a portion of the multi-electrode ion mixed gas can be introduced into the first aeration mechanism 42 and the second aeration mechanism 43 in the reaction tank 1. The first aeration mechanism 42 can not only catalytically oxidize the wastewater again, but also play a mixing role, so that the wastewater entering the reaction tank 1 can be fully mixed with the added reagents, thereby improving the flocculation effect of the wastewater. The second aeration mechanism 43 can not only make the water in the reaction tank 1 overflow in stages, but also further mix and react with the multi-electrode ion mixed gas during the overflow process, thereby improving the catalytic oxidation efficiency and ensuring the quality of water treatment.

[0037] like Figure 3 As shown, the reaction chamber 1 is equipped with multiple staggered first partitions 5 and second partitions 6. The multiple second partitions 6 divide the inner cavity of the reaction chamber 1 from left to right into a left end cavity 101, multiple middle cavities 102 and a right end cavity 103. The main air inlet pipe 3 is connected to the left end cavity 101. The first aeration mechanism 42 is installed in the left end cavity 101, and multiple second aeration mechanisms 43 are respectively installed in the multiple middle cavities 102.

[0038] It should be noted that this application does not limit the specific number of the first partition 5 and the second partition 6. The following only provides a specific number for reference: four of the first partition 5 and four of the second partition 6 are provided. The height of the first partition 5 is less than the height of the inner cavity of the reaction chamber 1, and the height of the second partition 6 is equal to the height of the inner cavity of the reaction chamber 1. By using four second partitions 6, the inner cavity of the reaction chamber 1 can form three central cavities 102.

[0039] like Figure 1 and Figure 4 As shown, the sewage pipe fitting 2 includes a first inlet pipe 21, a gas-liquid mixer 22, and a second inlet pipe 23. The first inlet pipe 21 and the second inlet pipe 23 are connected by the gas-liquid mixer 22, and the second inlet pipe 23 is connected to the inner cavity of the reaction tank 1. The main air inlet pipe 3 is connected to the air inlet at the top of the gas-liquid mixer 22.

[0040] It should be noted that the first inlet pipe 21 introduces the dyeing and printing wastewater into the gas-liquid mixer 22, and the main inlet pipe 3 also introduces the multi-ion mixed gas into the gas-liquid mixer 22, so that the dyeing and printing wastewater and the multi-ion mixed gas can be mixed and reacted. Finally, the water after the mixture reaction is introduced into the reaction tank 1 through the second inlet pipe 23. A one-way valve is installed at the air inlet at the top of the gas-liquid mixer 22. The one-way valve allows the multi-ion mixed gas to be injected into the gas-liquid mixer 22, but the water in the gas-liquid mixer 22 cannot enter the air inlet.

[0041] like Figure 3 and Figure 5 As shown, the first aeration mechanism 42 includes an aerator 421 and a first branch pipe 422. The aerator 421 is installed between the inner wall of the reaction chamber 1 and the side wall of the first partition 5 by a bracket. One end of the first branch pipe 422 is connected to the air inlet end of the aerator 421, and the other end of the first branch pipe 422 passes through the top of the reaction chamber 1 and is connected to the auxiliary air inlet pipe 41.

[0042] It should be noted that after the initial mixing and reaction of the dyeing and printing wastewater with the multi-ion mixed gas, it enters the left end cavity 101. The multi-ion mixed gas transported in the main air inlet pipe 3 can be diverted to the first branch pipe 422 by the auxiliary air inlet pipe 41, so that part of the multi-ion mixed gas can be aerated in the left end cavity 101 by the aerator 421. This not only allows for a second mixing and reaction of the wastewater, but also allows for the addition of chemicals for reaction and flocculation treatment after the wastewater enters the left end cavity 101. The gas sprayed by the aerator 421 will play a role in mixing and turbulence, promoting the mixing of chemicals and improving the treatment effect.

[0043] like Figure 3-7 As shown, the second aeration mechanism 43 includes an outer serpentine tube 431, an inner serpentine tube 432, a second branch tube 433, several sets of aeration elements 434, and several sets of support elements 435. The outer serpentine tube 431 is connected between the second partition 6 and the upper side wall of the first partition 5, and one end of the outer serpentine tube 431 penetrates the second partition 6. The inner serpentine tube 432 is located inside the outer serpentine tube 431, and the inner serpentine tube 432 is connected to the inner wall of the outer serpentine tube 431 through several sets of support elements 435. Several sets of aeration elements 434 are distributed along the trajectory of the inner serpentine tube 432. One end of the second branch tube 433 is connected to the auxiliary air inlet pipe 41, and the other end of the second branch tube 433 is connected to the inner serpentine tube 432.

[0044] It should be noted that the height of the outer serpentine tube 431 is lower than the water injection height of the second water inlet pipe 23. When the water level in the left end cavity 101 reaches the height of the outer serpentine tube 431, the water will enter the outer serpentine tube 431 and flow along its path (the serpentine structure is beneficial to extending the water flow path). Using the auxiliary air inlet pipe 41 and the second branch pipe 423, some of the multi-electrode ion mixed gas can be introduced into the inner serpentine tube 432 and sprayed out by the aeration element 434. Since the inner serpentine tube 432 is located inside the outer serpentine tube 431 (the outer cross-section of the inner serpentine tube 432 is smaller than the inner cross-section of the outer serpentine tube 431), the multi-electrode ion mixed gas can be mixed and reacted with water again, further improving the treatment effect. Several sets of support elements 435 can also block the flowing water in the outer serpentine tube 431. The collision of the support elements 435 during the water flow can have a turbulence effect, which is beneficial to improving the mixing effect.

[0045] Since the water level in the left end cavity 101 and the middle cavity 102 will only overflow when it reaches the height of the outer serpentine tube 431, in order to avoid wasting the multi-ion mixed gas, an electric control valve 20 is installed on the auxiliary air inlet pipe 41 on the right side of the first branch pipe 422 and the auxiliary air inlet pipe 41 between the two adjacent second branches 433. The corresponding electric control valve 20 will only be opened when the corresponding outer serpentine tube 431 overflows.

[0046] like Figure 1 and Figure 4 As shown, the first water inlet pipe 21 includes a first conduit 211, a tee 212, and a second conduit 213. The first conduit 211 and the second conduit 213 are respectively connected to the two ends of the tee 212. The other end of the tee 212 is connected to a return water pipe 7. One end of the return water pipe 7 is connected to a pump body 8. The pump body 8 is used to extract the treated water in the reaction tank 1.

[0047] It should be noted that pump body 8 is used to draw water from the right end cavity 103 (e.g., Figure 3 The water in the chamber (as shown) enters the reaction tank 1 and is treated. The treated water eventually collects in the right end cavity 103. If the treated water in the right end cavity 103 is sufficient to meet the discharge standards, the pump body 8 is started, and the water in the right end cavity 103 is returned to the front end of the gas-liquid mixer 22 in conjunction with the return water pipe 7 for easy circulation.

[0048] like Figure 1-3 As shown, the top of the left cavity 101 is provided with a dosing port 9, the top of the middle cavity 102 is provided with a vent 10, the second partition 6 of the right cavity 103 is provided with an overflow port 11, and the right cavity 103 is provided with an outlet 13 with a water outlet valve 12 near the upper side wall.

[0049] It should be noted that the dosing port 9 facilitates the addition of catalysts and flocculants for water treatment reactions, while the vent 10 at the top of the middle cavity 102 facilitates the discharge of unreacted multi-ion mixed gas. A recovery pipe can be added here for its recovery. The overflow port 11 is lower than the outer serpentine pipe 431 (e.g., Figure 5 The height (as shown) allows the treated water to overflow into the right end cavity 103 via the overflow port 11. A water quality sensor (not shown in the figure) for online detection is installed in the outlet 13. If the water quality is qualified, the outlet valve 12 is opened for discharge; otherwise, it flows back to the gas-liquid mixer 22 (as shown). Figure 4 The front end (as shown) is processed in a loop.

[0050] like Figure 1-3 As shown, a first grid 14 is installed in the left end cavity 101, and a second grid 15, a first packing layer 16, and a second packing layer 17 are installed sequentially in multiple middle cavities 102. A drain outlet 18 is installed on the side wall near the bottom of both the left end cavity 101 and the middle cavity 102, and a mud guide plate 19 symmetrical about the drain outlet 18 is installed in both the left end cavity 101 and the middle cavity 102.

[0051] It should be noted that the first screen 14 is used to intercept larger solid impurities and suspended matter, preventing these substances from entering subsequent treatment units and reducing clogging. The second screen 15, the first packing layer 16, and the second packing layer 17 form a multi-stage filtration and adsorption system. The second screen 15 further intercepts smaller particles, while the first packing layer 16 and the second packing layer 17 remove pollutants such as organic matter, ammonia nitrogen, and phosphorus from the water through biofilm or physicochemical adsorption on their surfaces, thereby improving the quality of the effluent. The end of the guide plate 19 near the drain outlet 18 is lower than the end away from the drain outlet 18, so that opening the drain outlet 18 facilitates the smooth discharge of sludge and sediment, avoiding accumulation.

[0052] like Figure 6-7 As shown, the outer serpentine tube 431 is open at both ends, and the inner serpentine tube 432 is sealed at both ends. Each set of aeration elements 434 consists of multiple aeration heads distributed circumferentially along the outer wall of the inner serpentine tube 432, and each set of support elements 435 consists of multiple pillars distributed circumferentially along the outer wall of the inner serpentine tube 432.

[0053] It should be noted that, in order to prevent water from entering the aeration head, the aeration head in this embodiment is designed to prevent backflow. Even when the air supply stops, it can prevent water from flowing back into the aeration head. For example, it can be designed with an inclined channel or a labyrinth structure to increase the difficulty of water entering, allowing only gas to flow out and not allowing water to flow back in.

[0054] A treatment process for a catalytic oxidation deep treatment device for dyeing and printing wastewater includes the following steps:

[0055] Step 1: Inject multi-ion mixed gas for catalytic oxidation of dyeing and printing wastewater through the main air inlet pipe 3, and at the same time inject dyeing and printing wastewater through the sewage pipe fitting 2 so that it merges and mixes with the multi-ion mixed gas and enters the left end cavity 101 of the reaction chamber 1.

[0056] Step 2: The auxiliary air inlet pipe 41 introduces a portion of the multi-element ion mixed gas into the first aeration mechanism 42 in the left end cavity 101 to aerate and oxidize the dyeing wastewater again, while adding reagents for reaction and flocculation treatment.

[0057] Step 3: The second aeration mechanism 43 gradually overflows the treated water in the left end cavity 101 into multiple middle cavities 102. During the overflow process, the auxiliary air inlet pipe 41 introduces multi-element ion mixed gas again for further oxidation reaction treatment.

[0058] Step 4: The water injected into the reaction tank 1 gradually overflows from the left end cavity 101 to multiple middle cavities 102. During the flow, sedimentation and filtration are carried out in each cavity. Finally, the treated water enters the right end cavity 103. If the test meets the standard, it is discharged; otherwise, it is returned to the sewage pipe 2 for circulation treatment.

[0059] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A catalytic oxidation deep treatment device for dyeing and printing wastewater, comprising a reaction tank (1), wastewater pipe fittings (2), and a main inlet pipe (3) for conveying a multi-element ion mixed gas, characterized in that, The sewage pipe fitting (2) is used to mix and react the dyeing and printing wastewater with the multi-ion mixed gas and then introduce it into the reaction box (1). A gas-liquid remixing mechanism (4) is installed between the main air inlet pipe (3) and the inner cavity of the reaction box (1). The gas-liquid remixing mechanism (4) includes a secondary air inlet pipe (41), a first aeration mechanism (42), and a plurality of second aeration mechanisms (43). One end of the secondary air inlet pipe (41) is connected to the side wall of the main air inlet pipe (3), and the secondary air inlet pipe (41) is connected to the main air inlet pipe (3). The first aeration mechanism (42) and the second aeration mechanism (43) are both installed in the reaction chamber (1), and the first aeration mechanism (42) and the second aeration mechanism (43) are both connected to the secondary air inlet pipe (41). The reaction chamber (1) is equipped with a plurality of staggered first partitions (5) and second partitions (6). The plurality of second partitions (6) divide the inner cavity of the reaction chamber (1) from left to right into a left end cavity (101), a plurality of middle cavities (102) and a right end cavity (103). The main air inlet pipe (3) is connected to the left end cavity (101). The first aeration mechanism (42) is installed in the left end cavity (101), and the plurality of second aeration mechanisms (43) are respectively installed in the plurality of middle cavities (102). The first aeration mechanism (42) includes an aerator (421) and a first branch pipe (422). The aerator (421) is installed between the inner wall of the reaction tank (1) and the side wall of the first partition (5) by a bracket. One end of the first branch pipe (422) is connected to the air inlet of the aerator (421), and the other end of the first branch pipe (422) passes through the top of the reaction tank (1) and is connected to the auxiliary air inlet pipe (41). The second aeration mechanism (43) includes an outer serpentine tube (431), an inner serpentine tube (432), a second branch pipe (433), several sets of aeration elements (434), and several sets of support elements (435). The outer serpentine tube (431) is connected between the second partition (6) and the upper side wall of the first partition (5), and one end of the outer serpentine tube (431) penetrates the second partition (6). The inner serpentine tube (432) is located inside the outer serpentine tube (431), and the inner serpentine tube (432) is connected to the inner wall of the outer serpentine tube (431) through several sets of support elements (435). Several sets of aeration elements (434) are distributed along the trajectory of the inner serpentine tube (432). One end of the second branch pipe (433) is connected to the auxiliary air inlet pipe (41), and the other end of the second branch pipe (433) is connected to the inner serpentine tube (432). The outer serpentine tube (431) is open at both ends, and the inner serpentine tube (432) is sealed at both ends. Each set of aeration elements (434) consists of multiple aeration heads distributed circumferentially along the outer wall of the inner serpentine tube (432), and each set of support elements (435) consists of multiple support columns distributed circumferentially along the outer wall of the inner serpentine tube (432).

2. The catalytic oxidation deep treatment device for dyeing and printing wastewater according to claim 1, characterized in that, The sewage pipe fitting (2) includes a first inlet pipe (21), a gas-liquid mixer (22), and a second inlet pipe (23). The first inlet pipe (21) and the second inlet pipe (23) are connected through the gas-liquid mixer (22), and the second inlet pipe (23) is connected to the inner cavity of the reaction tank (1). The main air inlet pipe (3) is connected to the air inlet at the top of the gas-liquid mixer (22).

3. The catalytic oxidation deep treatment device for dyeing and printing wastewater according to claim 2, characterized in that, The first water inlet pipe (21) includes a first conduit (211), a tee (212), and a second conduit (213). The first conduit (211) and the second conduit (213) are respectively connected to the two ends of the tee (212). The other end of the tee (212) is connected to a return water pipe (7). One end of the return water pipe (7) is connected to a pump body (8). The pump body (8) is used to extract the treated water in the reaction tank (1).

4. The catalytic oxidation deep treatment device for dyeing and printing wastewater according to claim 1, characterized in that, The top of the left end cavity (101) is provided with a dosing port (9), the top of the middle cavity (102) is provided with an exhaust port (10), the second partition (6) of the right end cavity (103) is provided with an overflow port (11), and the right end cavity (103) is provided with an outlet (13) with a water outlet valve (12) near the upper side wall.

5. The catalytic oxidation deep treatment device for dyeing and printing wastewater according to claim 1, characterized in that, A first grid (14) is installed in the left end cavity (101), and a second grid (15), a first packing layer (16), and a second packing layer (17) are installed in the multiple middle cavities (102) in sequence. A drain outlet (18) is installed on the side wall near the bottom of both the left end cavity (101) and the middle cavity (102), and a mud guide plate (19) symmetrical about the drain outlet (18) is installed in both the left end cavity (101) and the middle cavity (102).

6. A treatment process using a catalytic oxidation deep treatment device for dyeing and printing wastewater according to any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Inject the multi-ion mixed gas for catalytic oxidation of dyeing and printing wastewater through the main air inlet pipe (3), and at the same time inject the dyeing and printing wastewater through the sewage pipe fitting (2) so that it merges and mixes with the multi-ion mixed gas and enters the left end cavity (101) of the reaction chamber (1); Step 2: The auxiliary air inlet pipe (41) introduces part of the multi-element ion mixed gas into the first aeration mechanism (42) in the left end cavity (101) to aerate and oxidize the dyeing wastewater again, while adding reagents for reaction and flocculation treatment. Step 3: The second aeration mechanism (43) gradually overflows the treated water in the left end cavity (101) into multiple middle cavities (102). During the overflow process, the auxiliary air inlet pipe (41) introduces multi-element ion mixed gas again for further oxidation reaction treatment. Step 4: The water injected into the reaction tank (1) gradually overflows from the left end cavity (101) to multiple middle cavities (102). During the flow, sedimentation and filtration are carried out in each cavity. Finally, the treated water enters the right end cavity (103). If the test meets the standard, it is discharged; otherwise, it is returned to the sewage pipe (2) for circulation treatment.

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