Multi-site ozone catalytic oxidation decoloring tower for vat dye production wastewater

Abstract

This invention discloses a multi-site ozone catalytic oxidation decolorization tower for wastewater from vat dye production, belonging to the field of industrial wastewater treatment technology. The technical problem to be solved is to improve the contact and mixing efficiency of wastewater and ozone, and to improve ozone utilization and wastewater decolorization quality. The key points of the technical solution are: the main body of the decolorization tower is equipped with a diversion reaction component, a gas conveying component, and an ultrasonic component. The diversion reaction component disperses and conveys the wastewater to multiple Venturi tube assemblies, which form a flow velocity difference. Combined with the spiral blade assembly, the wastewater flows in a spiral. The gas conveying component uniformly delivers ozone, and the ultrasonic component generates ultrasonic waves to promote the reaction. This decolorization tower fully mixes wastewater and ozone through the flow velocity difference, spiral flow, and ultrasonic cavitation. It also realizes ozone recycling and wastewater recycling treatment, and allows for observation of color changes and detection of ozone content. It is suitable for industrial wastewater treatment.

Description

Technical Field

[0001] This invention relates to the field of industrial wastewater treatment technology, and in particular to a multi-site ozone catalytic oxidation decolorization tower for vat dye production wastewater. Background Technology

[0002] In the field of industrial wastewater treatment, with increasingly stringent environmental protection requirements and the in-depth promotion of the concept of wastewater resource utilization, industrial wastewater treatment is facing higher challenges and demands. At present, zero-discharge technology for industrial wastewater and deep treatment and reuse technology for recalcitrant chemical wastewater have become research hotspots and development directions. For the deep decolorization treatment of recalcitrant chemical wastewater such as that from the production of vat dyes, ozone catalytic oxidation is a common technical approach. This technology usually involves introducing ozone into the wastewater reaction device to decompose the chromophores in the wastewater using its strong oxidizing properties, thereby achieving the purpose of decolorization. In common ozone oxidation decolorization tower structures, the contact reaction efficiency between wastewater and ozone is a key factor affecting treatment effectiveness and cost. A common practice is to allow wastewater to flow through the tower from top to bottom while simultaneously introducing ozone from the bottom or side of the tower, using countercurrent or cross-flow to increase the contact area. Under certain conditions, such as when the wastewater flow rate is large or the water quality fluctuates, this large-scale contact method may result in uneven mixing of wastewater and ozone, with some areas having reaction dead zones. The overall flow velocity of wastewater in the tower is relatively stable, limiting its contact time and shear force with ozone bubbles. This, to some extent, affects the efficiency of ozone dissolution and mass transfer into the wastewater, causing some ozone to escape before fully participating in the reaction. In addition, the treated wastewater may still contain unreacted ozone, and direct discharge will waste oxidant and may cause secondary environmental problems. To address the aforementioned issues, this invention proposes a multi-site ozone catalytic oxidation decolorization tower for vat dye production wastewater. Summary of the Invention

[0003] This invention provides a multi-site ozone catalytic oxidation decolorization tower for vat dye production wastewater, which solves the shortcomings of existing ozone oxidation decolorization towers, such as uneven mixing of wastewater and ozone, reaction dead zones, and low ozone utilization.

[0004] This invention provides the following technical solution: A multi-site ozone catalytic oxidation decolorization tower for vat dye production wastewater includes a base, multiple support pillars fixed to the base, multiple layers of assembly plates sleeved on the support pillars, and a decolorization tower body supported and fixed by the multiple layers of assembly plates. The top and bottom of the decolorization tower body are respectively provided with an inlet port and an outlet port. The decolorization tower also includes: The diversion reaction component is installed at the bottom of the inlet port and is used to disperse and transport wastewater. A gas delivery component is installed inside the decolorization tower body and connected to the diversion reaction component, used to deliver ozone into the diversion reaction component; An ultrasonic component, installed inside the decolorization tower body, is used to generate ultrasonic waves to promote the reaction between wastewater and ozone. The diversion reaction component includes a diversion box connected to the bottom of the liquid inlet port, multiple conveying bends connected to the diversion box, and a Venturi tube assembly connected to the conveying bends. The gas delivery component delivers ozone into the Venturi tube assembly to mix with the wastewater flowing through the Venturi tube assembly for a decolorization reaction. The ultrasonic component generates ultrasonic waves that act on the wastewater in the Venturi tube assembly.

[0005] In one possible design, the Venturi tube assembly includes a plurality of longitudinally arranged conical reaction tubes and connecting pipes connecting adjacent conical reaction tubes. The diameter of the connecting pipes is smaller than the diameter of the conical reaction tubes. The top of the uppermost connecting pipe is fixedly connected to the corresponding delivery bend, so that the wastewater flows faster when passing through the connecting pipes and slower when passing through the conical reaction tubes to create a velocity difference.

[0006] In one possible design, the diversion reaction component further includes multiple dispersion components. Each dispersion component includes two support brackets fixed inside the conical reaction tube, a dispersion pipe fixed on the two support brackets, and a spiral blade assembly fixedly sleeved on the dispersion pipe. Multiple jet nozzles are provided on the wall of the dispersion pipe. The spiral blade assembly is used to guide the wastewater flowing through the conical reaction tube to form a spiral flow, so that the ozone is fully mixed with the spirally flowing wastewater after being ejected through the jet nozzles.

[0007] In one possible design, the gas delivery component includes an isolation plate fixed inside the decolorization tower body, a connecting box fixed to the bottom of the isolation plate, a gas pump installed on the top of the isolation plate, and a plurality of longitudinally arranged dispersion boxes. The gas pump's suction end is connected to the connecting box, and the gas pump's outlet end is connected to the lowest dispersion box. The plurality of dispersion boxes are connected to each other through gas delivery pipes, and each dispersion box is connected to the corresponding dispersion component through an outlet pipe to evenly distribute ozone to the plurality of dispersion pipes.

[0008] In one possible design, the bottom of the connecting box is provided with an air inlet, and a solenoid valve I is installed in the air inlet. The side wall of the connecting box is provided with an air receiving pipe, and a solenoid valve II is installed in the air receiving pipe. When the solenoid valve II is closed and the solenoid valve I is open, the unreacted ozone gas in the decolorization tower body is drawn into the connecting box through the air inlet and circulated to the dispersion pipe by the gas pump to improve the ozone utilization rate.

[0009] In one possible design, the ultrasonic component includes multiple ultrasonic oscillating plates fixedly installed on the inner surface of the side wall of the decolorization tower body and a control display. The control display has a built-in ultrasonic module and is electrically connected to the ultrasonic oscillating plates via wires. The ultrasonic waves generated by the ultrasonic oscillating plates are used to break the liquid film around the ozone bubbles, thereby refining the bubbles.

[0010] In one possible design, a flow pipe is fixedly installed at the bottom end of the connecting pipe located at the bottom. The bottom ends of multiple flow pipes are jointly fixedly installed with the same flow divider ring, which is fixed to the inner wall of the decolorization tower body. Supports are fixed on multiple flow pipes, and level sensors for detecting liquid level are installed on the supports.

[0011] In one possible design, the decolorization tower further includes a liquid pump and a transparent transfer box. The suction end of the liquid pump is connected to the liquid outlet port through a flow pipe, and the water outlet end of the liquid pump is connected to the transparent transfer box. The top of the transparent transfer box is connected to the top of the decolorization tower body through a return pipe to form a wastewater circulation loop. An ozone detection sensor is installed at the bottom of the transparent transfer box to detect the ozone content in the wastewater.

[0012] In one possible design, a solenoid valve III is installed in the outlet port above the flow pipe, a solenoid valve V is installed in the return pipe, a water inlet pipe is connected to the bottom of the flow pipe, a solenoid valve VI is installed in the water inlet pipe, a water outlet connector is provided on the side wall of the transparent transfer box, a solenoid valve IV is installed in the water outlet connector, and the liquid pump, solenoid valve III, solenoid valve IV, solenoid valve V and solenoid valve VI are all electrically connected to the control display via wires.

[0013] In one possible design, multiple conveying bends are fixedly installed at equal intervals on the side wall of the diversion box, and each conveying bend is connected to an independent Venturi tube assembly. The conical reaction tube in the Venturi tube assembly is fixed to the inner wall of the decolorization tower body by an assembly bracket.

[0014] In this invention, during wastewater decolorization, the system first connects to an external wastewater delivery pipeline via an inlet pipe. The control display then opens solenoid valves VI and V, closes solenoid valves III and IV, and starts the liquid pump. Wastewater is drawn into the inlet pipe, transported through a transparent transfer box and a return pipe to the decolorization tower body, and then dispersed into multiple conical reaction tubes via the inlet, distribution box, and multiple delivery bends. When the wastewater level in the decolorization tower body reaches the level sensor's detection position, solenoid valve VI is closed. Finally, the gas inlet pipe is connected to an external ozone gas delivery pipeline. The gas pump draws ozone gas into the dispersion chamber through the gas inlet pipe and connecting box. It is then dispersed and delivered to multiple dispersion chambers via multiple gas delivery pipes, and subsequently to corresponding connecting pipes via multiple outlet pipes. Finally, the ozone is dispersed and delivered into the conical reaction tube through multiple jet nozzles. At this point, wastewater flows out from the delivery bend, sequentially into multiple connecting pipes and multiple conical reaction tubes. A velocity difference is created between the high flow rate in the connecting pipes and the slow flow rate in the conical reaction tubes. Furthermore, the spiral blade assembly inside the conical reaction tube slows down the wastewater flow and causes it to flow in a spiral pattern, ensuring thorough mixing with the ozone for decolorization. Simultaneously, the operation control display is active. The device, controlled by an ultrasonic control module, activates multiple ultrasonic oscillating plates. Utilizing the cavitation effect of ultrasound to generate micro-jets and shock waves, it violently agitates the wastewater, disrupting the liquid film surrounding the ozone bubbles, resulting in finer bubbles and more thorough decolorization. During the process, once the required amount of ozone gas is introduced, the control display closes solenoid valve II and opens solenoid valve I. This allows the ozone gas entering the decolorization tower to be drawn into the connecting housing through the inlet, and then circulated by a gas pump to multiple conical reaction tubes, improving ozone utilization. Afterwards, solenoid valve III is opened, starting the liquid pump to pump the liquid into the decolorization tower. Wastewater inside the main body is drawn out from the outlet port and circulated through a flow pipe, liquid pump, transparent transfer box, and return pipe. This allows the wastewater to circulate through multiple conical reaction tubes, ensuring full contact with free ozone gas and improving the quality of wastewater decolorization. As the wastewater flows through the transparent transfer box, color changes can be observed. An ozone detection sensor detects the ozone gas content in the wastewater. After the wastewater decolorization is completed, solenoid valves V and VI are closed, while solenoid valves III and IV are opened. The liquid pump is then started to transport the wastewater flowing into the main body of the decolorization tower to the transparent transfer box, where it is discharged through the outlet connector, completing the wastewater decolorization and discharge process.

[0015] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit the invention. Beneficial effects

[0016] 1. Wastewater is dispersed and transported to multiple Venturi tube assemblies through a diversion box and multiple conveying bends to regulate the wastewater flow rate, so as to fully mix the wastewater with ozone and improve the reaction efficiency. 2. Multiple conical reaction tubes are arranged longitudinally, and adjacent containers are connected by connecting pipes with smaller diameters. The wastewater flows quickly through the connecting pipes and slowly through the conical reaction tubes, creating a velocity difference. The spiral blade assembly slows down the wastewater flow and makes it flow in a spiral manner, promoting thorough mixing with ozone for decolorization. 3. Multiple ultrasonic oscillating plates generate ultrasonic waves, which use cavitation to generate micro-jets and shock waves to violently agitate the wastewater, destroy the liquid film around the ozone bubbles, make the bubbles break into finer pieces, and make the wastewater decolorization treatment more thorough. 4. The gas pump draws ozone gas into the dispersion chamber, delivers it to multiple dispersion chambers through multiple gas supply pipes, and then delivers it to the corresponding docking pipes through the gas outlet pipes, finally dispersing it evenly into multiple dispersion pipes to achieve the purpose of evenly dispersing and delivering ozone gas. 5. The liquid pump draws in the wastewater and transports it through a transparent transfer box and return pipe to the main body of the decolorization tower, allowing the wastewater to disperse into multiple conical reaction tubes. When the liquid level reaches the detection position of the liquid level sensor, the liquid pump draws the wastewater out from the outlet port and circulates it, allowing the wastewater to circulate through multiple conical reaction tubes and fully contact with free ozone gas, thereby improving the decolorization quality.

[0017] This invention can disperse and transport wastewater to multiple conical reaction tubes, and utilize the flow rate difference, spiral flow and ultrasonic cavitation to fully mix the wastewater with ozone. It also improves ozone utilization and decolorization quality through ozone recycling and wastewater recycling treatment, and allows for observation of color changes and detection of ozone content. Attached Figure Description

[0018] Figure 1 This is a first-view three-dimensional structural schematic diagram of a multi-site ozone catalytic oxidation decolorization tower for vat dye production wastewater provided in an embodiment of the present invention. Figure 2 This is a second-view three-dimensional structural schematic diagram of a multi-site ozone catalytic oxidation decolorization tower for vat dye production wastewater provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of the main view cross-sectional structure of the multi-site ozone catalytic oxidation decolorization tower for vat dye production wastewater provided in an embodiment of the present invention; Figure 4 This is a three-dimensional cross-sectional schematic diagram of the main body of the decolorization tower of the multi-site ozone catalytic oxidation decolorization tower for decolorizing vat dye production wastewater provided in an embodiment of the present invention. Figure 5 This is a three-dimensional schematic diagram of the inlet port, the distribution box, and the connection structure of multiple conical reaction tubes of the multi-site ozone catalytic oxidation decolorization tower for vat dye production wastewater provided in an embodiment of the present invention. Figure 6This is a three-dimensional schematic diagram of the gas pump, connecting box, multiple conical reaction tubes and gas inlet pipe connection structure of the multi-site ozone catalytic oxidation decolorization tower for vat dye production wastewater provided in an embodiment of the present invention. Figure 7 This is a three-dimensional cross-sectional schematic diagram of the conical reaction tube structure of the multi-site ozone catalytic oxidation decolorization tower for vat dye production wastewater provided in an embodiment of the present invention. Figure 8 This is a three-dimensional schematic diagram of the connection structure of the two support frames, dispersion pipes and spiral blade assembly of the multi-site ozone catalytic oxidation decolorization tower for vat dye production wastewater provided in an embodiment of the present invention. Figure 9 This is a three-dimensional schematic diagram of the connection structure of the liquid pump, outlet port and transfer tank of the multi-site ozone catalytic oxidation decolorization tower for vat dye production wastewater provided in an embodiment of the present invention. Figure 10 This is a cross-sectional schematic diagram of the connection structure of the liquid pump, outlet port, and transfer tank of the multi-site ozone catalytic oxidation decolorization tower for vat dye production wastewater provided in an embodiment of the present invention.

[0019] Figure label: 1. Base; 2. Support column; 3. Assembly plate; 4. Decolorization tower body; 5. Liquid inlet port; 6. Diversion box; 7. Conveying bend; 8. Assembly bracket; 9. Conical reaction tube; 10. Connecting pipe; 11. Support bracket; 12. Dispersion pipe; 13. Jet nozzle; 14. Spiral blade assembly; 15. Connecting pipe; 16. Isolation plate; 17. Connecting box; 18. Gas inlet pipe; 19. Solenoid valve I; 20. Solenoid valve II; 21. Gas pump; 22. Dispersion box; 23. Conveying... 24. Gas outlet pipe; 25. Flow pipe; 26. Diverter ring; 27. Support frame; 28. Liquid level sensor; 29. ​​Ultrasonic oscillating plate; 30. Control display; 31. Liquid outlet port; 32. Flow pipe; 33. Liquid pump; 34. Transparent transfer box; 35. Water outlet connector; 36. Return pipe; 37. Water inlet pipe; 38. Solenoid valve III; 39. Solenoid valve IV; 40. Solenoid valve V; 41. Solenoid valve VI; 42. Ozone detection sensor; 43. Inspection door panel. Detailed Implementation

[0020] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0021] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "installation" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Furthermore, "connection" can be a direct connection or an indirect connection through an intermediate medium. "Fixed" means that the devices are connected to each other and their relative positional relationship remains unchanged after the connection. The directional terms mentioned in the embodiments of the present invention, such as "inner," "outer," "top," and "bottom," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0022] In this embodiment of the invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0023] In this embodiment of the invention, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0024] References to "one embodiment" or "some embodiments" as used in this specification mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of the invention. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless otherwise specifically emphasized.

[0025] In one embodiment: Refer to Figure 1-10A decolorization tower includes a base 1, multiple support columns 2 fixed to the base 1, multi-layer assembly plates 3 sleeved on the support columns 2, and a decolorization tower body 4 supported and fixed by the multi-layer assembly plates 3. The decolorization tower body 4 is a vertically arranged cylindrical shape, with a liquid inlet port 5 fixed through its top side wall and a liquid outlet port 31 fixed through its bottom side wall. Inside the decolorization tower body 4, from top to bottom, are arranged a diversion reaction component, a gas conveying component, and an ultrasonic component.

[0026] like Figure 3-6 As shown, the diversion reaction unit is used to disperse and multi-stage react the incoming wastewater. This unit includes a rectangular diversion box 6 fixed to the bottom of the inlet port 5. Four stainless steel conveying bends 7 are welded at equal intervals along the length of the sidewall of the diversion box 6. The outlet end of each conveying bend 7 extends downwards and connects to an independent Venturi tube assembly. The Venturi tube assembly consists of three longitudinally arranged conical reaction tubes 9, with a maximum inner diameter of 200 mm and a minimum inner diameter (i.e., neck) of 80 mm, made of ozone-resistant 316L stainless steel. Adjacent conical reaction tubes 9 are welded together by connecting pipes 10, the inner diameter of which is constant at 50 mm, thus its cross-sectional area is smaller than the maximum cross-sectional area of ​​the conical reaction tubes 9. The top of the uppermost connecting pipe 10 is welded and fixed to the outlet of the corresponding conveying bend 7. Each conical reaction tube 9 is fixed to the inner wall of the decolorization tower body 4 by an assembly bracket 8, and the assembly bracket 8 is locked to the pre-set mounting seat inside the decolorization tower body 4 by M10 bolts.

[0027] like Figure 7-8 As shown, a dispersion assembly is installed on the central axis inside each conical reaction tube 9. The dispersion assembly includes two symmetrically welded support brackets 11 to the inner wall of the conical reaction tube 9, with a horizontally positioned dispersion pipe 12 welded between the two support brackets 11. The dispersion pipe 12 is made of 316L stainless steel, and its wall has multiple 1mm diameter jet orifices 13 drilled at equal intervals along the axial direction, with a hole spacing of 15mm. A helical blade assembly 14 is coaxially welded to the outer wall of the dispersion pipe 12. This helical blade assembly 14 is made of 2mm thick 304 stainless steel plate, with a pitch of 100mm, and a 1mm gap between the outer edge of the helical blade assembly 14 and the inner wall of the conical reaction tube 9. A connecting pipe 15 is welded to the top of the dispersion pipe 12, extending upwards from the top of the conical reaction tube 9.

[0028] like Figure 3-5As shown, the gas supply component is used to supply ozone to each dispersion component. Inside the main body 4 of the decolorization tower, a horizontally positioned isolation plate 16 is welded and fixed in the middle section. The top and bottom of the isolation plate 16 are covered with a high-damping rubber isolation layer to prevent ultrasonic waves from transmitting upwards. Simultaneously, a high-damping rubber isolation layer is also installed on the inner wall of the decolorization tower 4 below the isolation plate 16. A connecting box 17 is welded below the isolation plate 16. An external gas inlet pipe 18 is connected to one side of the connecting box 17 for connecting to external ozone generating equipment. A solenoid valve II 20 is installed inside the gas inlet pipe 18. An air inlet is opened at the bottom of the connecting box 17, and a solenoid valve I 19 is installed therein. A gas pump 21 is installed at the center of the top surface of the isolation plate 16, with its suction pipe extending through the isolation plate 16 into the connecting box 17. The outlet of the gas pump 21 is connected to a longitudinally distributed gas supply system, which consists of three dispersion boxes 22 connected in series by two gas supply pipes 23. The outlet of the gas pump 21 is connected to the bottom of the lowest dispersion chamber 22. Each dispersion chamber 22 has four outlet pipes 24 welded to its side. The other end of each outlet pipe 24 is connected to the docking pipe 15 on the corresponding conical reaction tube 9 through a flange, thereby delivering ozone to each dispersion pipe 12.

[0029] like Figure 3-5 As shown, a flow pipe 25 is welded to the bottom end of the connecting pipe 10 at the bottom. The lower ends of the four flow pipes 25 converge into an annular diversion ring 26 fixed to the inner wall of the decolorization tower body 4. The middle of the multiple flow pipes 25 is fixed by a support frame 27, on which a liquid level sensor 28 is installed to detect the liquid level height at the bottom of the decolorization tower body 4.

[0030] like Figure 1-4 As shown, the ultrasonic component includes four ultrasonic oscillating plates 29 evenly distributed and welded to the inner surface of the bottom side wall of the decolorization tower body 4. A control display 30 is mounted on one of the mounting plates 3, which integrates an ultrasonic generating module and control circuitry. The control display 30 is electrically connected to the liquid level sensor 28, the ultrasonic oscillating plates 29, solenoid valve I 19, solenoid valve II 20, and the gas pump 21 via shielded cables.

[0031] like Figure 9-10As shown, a liquid pump 33 is also installed on the base 1. Its suction end is connected to the liquid outlet port 31 through a flow pipe 32. A solenoid valve III 38 is installed in the liquid outlet port 31 above the inlet of the flow pipe 32. The outlet end of the liquid pump 33 is connected to a transparent polycarbonate transfer box 34. The top of the transparent transfer box 34 is connected to a return pipe 36. The return pipe 36 passes upward through the multi-layer assembly plate 3 and is welded to the top side wall of the decolorization tower body 4. A solenoid valve V 40 is installed in the return pipe 36. The bottom side wall of the flow pipe 32 is also connected to an inlet pipe 37 for receiving the wastewater to be treated. A solenoid valve VI 41 is installed in the inlet pipe 37. A water outlet connector 35 is provided on the lower side of the transparent transfer box 34, and a solenoid valve IV 39 is installed inside it. The liquid pump 33, solenoid valve III 38, solenoid valve IV 39, solenoid valve V 40, and solenoid valve VI 41 are all electrically connected to the control display 30. In addition, an ozone detection sensor 42 is installed at the bottom of the transparent transfer box 34 to detect the concentration of dissolved ozone in the circulating wastewater. This sensor is also connected to the control display 30.

[0032] Processing steps: At the start of processing, the operator opens solenoid valves VI 41 and V 40, closes solenoid valves III 38 and IV 39, and starts liquid pump 33 via the control display 30. The wastewater to be treated is drawn in through inlet pipe 37, flows sequentially through liquid pump 33, transparent transfer box 34, and return pipe 36, and finally enters from the top of the decolorization tower body 4. The wastewater enters the distribution box 6 through inlet port 5, is evenly distributed to four conveying bends 7, and then enters four independent Venturi tube assemblies.

[0033] When wastewater flows through the Venturi tube assembly, its velocity increases as it first passes through the smaller-diameter connecting pipe 10; subsequently, it enters the larger-section conical reaction tube 9, where the velocity decreases. This design is not arbitrary but based on the engineering requirements of gas-liquid mixing. If the wastewater maintains a constant high-speed flow throughout the path, ozone bubbles are difficult to effectively shear and disperse, easily forming large bubbles that rise rapidly, resulting in short contact time. This embodiment actively creates velocity variations by setting alternating necking (connecting pipe 10) and expansion (conical reaction tube 9) structures. When the wastewater enters the low-speed expansion chamber from a high-speed flow state, the turbulence of the flow field increases, which is beneficial for the subsequent entrainment and breakup of ozone gas. At the same time, the helical blade assembly 14 installed inside the conical reaction tube 9 further guides the wastewater to form a swirling flow. Based on engineering experience, without such a flow guiding structure, when the container's inner diameter is large (e.g., 200 mm), the wastewater may flow in a relatively straight, plug-like manner, with an indistinct velocity gradient between the central and peripheral regions. This is not conducive to radial mixing with the ozone sprayed from the central dispersion pipe 12. The helical blade assembly 14 forces the wastewater to rotate, generating centrifugal force that throws the wastewater towards the vicinity of the pipe wall, while the newly sprayed ozone remains at the center. This creates a concentration gradient between the two in the radial direction, promoting diffusion and mass transfer.

[0034] When the level sensor 28 detects that the liquid level at the bottom of the decolorization tower body 4 has reached the preset height (e.g., 1.5 meters from the inner wall of the bottom of the tower), the control display 30 sends a signal to automatically close the solenoid valve VI 41 and stop the water intake. At the same time, the system starts the ozone dosing process: the solenoid valve II 20 is opened and the gas pump 21 is started. External ozone enters the connecting box 17 through the gas inlet pipe 18, is pressurized by the gas pump 21, and is pumped into the series-connected dispersion box 22 system in sequence. It is then evenly distributed to the dispersion pipes 12 in all twelve conical reaction tubes 9 (4 groups in total, 3 tubes in each group) through the gas outlet pipes 24, and finally sprayed out in the form of fine bubbles from the jet nozzles 13. At this time, the spiral flow of wastewater meets the ozone bubbles sprayed from multiple points in the center. Under the combined action of the velocity difference and the swirling shear force, the bubbles are elongated and broken into smaller microbubbles, increasing the gas-liquid contact area.

[0035] Subsequently, the operator activates the ultrasonic oscillator plate 29 via the control display 30. The ultrasonic waves propagate in the liquid, generating a cavitation effect. The resulting localized high-pressure microjets and shock waves violently disturb the wastewater, further disrupting the liquid film surrounding the ozone bubbles, making their particle size smaller, and even partially forming nanoscale bubbles. This significantly enhances the ozone dissolution rate and oxidation reaction efficiency. Without ultrasonic assistance, relying solely on fluid dynamics for mixing, ozone faces significant mass transfer resistance when treating certain high-viscosity or colloidal wastewater containing vat dyes, potentially leading to incomplete decolorization and occasional fluctuations in effluent color.

[0036] After sufficient ozone is introduced, solenoid valve II 20 can be closed while solenoid valve I 19 is opened. At this time, the external ozone supply stops. Undissolved ozone gas in the wastewater at the bottom of the decolorization tower body 4, as well as ozone escaping from the wastewater after the reaction, accumulates in the upper space of the tower. Since gas pump 21 is continuously running and the air inlet at the bottom of connecting box 17 (solenoid valve I 19 is open) is connected to the upper space of the tower, this part of the ozone gas is re-inhaled into connecting box 17, pressurized by gas pump 21, and re-enters the dispersion box 22 system to participate in the reaction again. This cycle process significantly improves the utilization rate of ozone. The ozone circulation loop is set up in this embodiment based on the economic consideration of the high operating cost of ozone generators. If circulation is not performed, the direct emission of unreacted ozone is not only wasteful, but may also require catalytic decomposition and other treatments for the exhaust gas, increasing operating costs and equipment complexity. By switching the built-in pump and valve, multiple uses of ozone in the reaction system are realized, which is especially important for situations where large volumes of water need to be treated and continuous ozone addition is required.

[0037] After ozone is added and circulation is initiated, solenoid valve III 38 is activated via control display 30. At this time, the suction end of liquid pump 33 switches to draw water from the outlet port 31 at the bottom of the decolorization tower body 4. Wastewater from the bottom of the tower is pumped out by liquid pump 33 through flow pipe 32, pumped into transparent transfer box 34, and then returned to the top of decolorization tower body 4 through return pipe 36, re-entering the diversion reaction component to begin a new round of "multi-stage conical container reaction and ultrasonic treatment" process. The wastewater continuously circulates within the system, continuously contacting the recycled ozone and undergoing ultrasonic treatment. During the circulation process, operators can visually observe the color change of the wastewater through transparent transfer box 34. Ozone detection sensor 42 monitors the concentration of dissolved ozone in the circulating wastewater in real time, and this data helps to determine the reaction progress. When the wastewater color significantly decreases to the target value and the dissolved ozone concentration tends to stabilize (indicating that the oxidation reaction is basically complete), the decolorization treatment can be considered complete.

[0038] After treatment, the drainage procedure is executed via the control display 30: solenoid valves V40 and VI41 are closed, and solenoid valves III38 and IV39 are opened. Liquid pump 33 continues to operate, extracting the treated wastewater from the decolorization tower body 4, which is then discharged through the transparent transfer box 34 and outlet connector 35, entering subsequent treatment units or the reuse system. After drainage, all system valves return to their initial state, ready for the treatment of the next batch of wastewater.

[0039] In this embodiment, in order to facilitate the maintenance and repair of the gas pump 21 in the future, an inspection hole is opened on the inner side wall of the decolorization tower body 4. The inspection hole is located above the isolation plate 16 and corresponds to the location of the gas pump 21. An inspection door plate 43 is tightly hinged in the inspection hole. The inspection door plate 43 is locked to the decolorization tower body 4 by a latch. By opening the inspection door plate 43 in the future, the gas pump 21 can be easily inspected and repaired.

[0040] In this embodiment, regarding the heat dissipation during the operation of the gas pump 21, since the wastewater passes through multiple series-connected conical reaction tubes 9 in sequence and is kept circulating, and since the conical reaction tubes 9 are made of 316 stainless steel, they can form a good heat conduction effect. Therefore, the heat generated during the operation of the gas pump 21 can be absorbed through the tube wall of the conical reaction tubes 9 and then carried away by the continuously flowing wastewater, thereby avoiding the problem of overheating of the gas pump 21.

[0041] This application can be used in the field of industrial wastewater treatment technology, or in other fields applicable to this application.

[0042] In another embodiment: Based on the above embodiment, an improvement is made: a multi-site ozone catalytic oxidation decolorization tower for vat dye production wastewater, which is applied to the field of industrial wastewater treatment technology. The structure of this embodiment is basically the same as that of the aforementioned embodiment, the difference being: simplification of some structures and adjustment of the operation mode to adapt to different investment budgets, treatment scales or water quality fluctuations.

[0043] 1. Simplified configuration of the Venturi tube assembly: The number of conical reaction tubes 9 in each branch is reduced to two, arranged in series. Correspondingly, the number of mounting brackets 8 and dispersion boxes 22 is also reduced to two. This configuration is suitable for applications with smaller treatment scales or relatively low initial color of the influent, and can reduce equipment height and manufacturing costs while ensuring a certain treatment effect.

[0044] 2. Optional Ultrasonic Components: In this embodiment, the ultrasonic oscillating plate 29 and related control circuitry are optional modules. Users can decide whether to install and activate the ultrasonic enhancement unit based on the specific characteristics of the wastewater to be treated (such as viscosity and suspended solids content) and the treatment standards. For wastewater with relatively good biodegradability that only requires moderate decolorization, the treatment objective can be achieved solely through mechanical mixing and ozone circulation within the multi-stage conical container, thereby saving on the investment and operating power consumption of the ultrasonic unit.

[0045] 3. Adjustment of Ozone Recycling Mode: The solenoid valve I19 and air inlet connected to the bottom of housing 17 have been removed. The system operates in ozone one-pass mode. Unreacted ozone is discharged with the exhaust gas from the exhaust port reserved at the top of the decolorization tower body 4, and is then treated by an external small exhaust gas destroyer (such as a heated catalytic decomposition device, not shown in the figure) before being discharged. This scheme further simplifies the control system and internal piping, and is suitable for scenarios with high ozone generator efficiency, relatively low ozone cost, or strict control over initial equipment investment.

[0046] 4. Material and structure of the transparent transfer box 34: The overall transparent polycarbonate box is replaced with a 304 stainless steel box, but an observation window with a tempered glass viewing mirror is opened on its side. This change enhances the structural strength of the transfer box, enabling it to withstand the higher pressure that the liquid pump 33 may generate, making it suitable for occasions where treated wastewater needs to be pumped to distant or higher locations.

[0047] However, as is well known to those skilled in the art, the working principles and wiring methods of solenoid valve I 19, solenoid valve II 20, liquid level sensor 28, ultrasonic oscillating plate 29, control display 30, liquid pump 33, solenoid valve III 38, solenoid valve IV 39, solenoid valve V 40, solenoid valve VI 41 and ozone detection sensor 42 are conventional means or common knowledge, and will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0048] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0049] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. In the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A multi-site ozone catalytic oxidation decolorization tower for wastewater from vat dye production, comprising a base (1), multiple support columns (2) fixed on the base (1), multi-layer assembly plates (3) sleeved on the support columns (2), and a decolorization tower body (4) supported and fixed by the multiple assembly plates (3), characterized in that, The top and bottom of the decolorization tower body (4) are respectively fixed with an inlet port (5) and an outlet port (31). The decolorization tower also includes: The diversion reaction component is installed at the bottom of the liquid inlet port (5) and is used to disperse and transport wastewater. A gas delivery component is installed inside the decolorization tower body (4) and connected to the diversion reaction component, for delivering ozone to the diversion reaction component; An ultrasonic component is installed inside the decolorization tower body (4) to generate ultrasonic waves to promote the reaction between wastewater and ozone; The diversion reaction component includes a diversion box (6) connected to the bottom of the liquid inlet port (5), a plurality of conveying bends (7) connected to the diversion box (6), and a venturi tube assembly connected to the conveying bends (7). The gas conveying component delivers ozone into the venturi tube assembly to mix with the wastewater flowing through the venturi tube assembly for a decolorization reaction. The ultrasonic component generates ultrasonic waves that act on the wastewater in the venturi tube assembly.

2. The multi-site ozone catalytic oxidation decolorization tower for vat dye production wastewater according to claim 1, characterized in that, The Venturi tube assembly includes a plurality of longitudinally arranged conical reaction tubes (9) and connecting pipes (10) connecting adjacent conical reaction tubes (9). The diameter of the connecting pipes (10) is smaller than the diameter of the conical reaction tubes (9). The top of the uppermost connecting pipe (10) is fixedly connected to the corresponding conveying bend (7) so that the wastewater flows faster when passing through the connecting pipes (10) and slower when passing through the conical reaction tubes (9) to form a velocity difference.

3. The multi-site ozone catalytic oxidation decolorization tower for vat dye production wastewater according to claim 2, characterized in that, The diversion reaction component also includes multiple dispersion components. Each dispersion component includes two support brackets (11) fixed inside the conical reaction tube (9), a dispersion pipe (12) fixed on the two support brackets (11), and a spiral blade assembly (14) fixedly sleeved on the dispersion pipe (12). Multiple jet nozzles (13) are provided on the pipe wall of the dispersion pipe (12). The spiral blade assembly (14) is used to guide the wastewater flowing through the conical reaction tube (9) to form a spiral flow so that ozone is fully mixed with the spirally flowing wastewater after being sprayed out through the jet nozzles (13).

4. The multi-site ozone catalytic oxidation decolorization tower for vat dye production wastewater according to claim 3, characterized in that, The gas delivery component includes an isolation plate (16) fixed inside the decolorization tower body (4), a connecting box (17) fixed to the bottom of the isolation plate (16), a gas pump (21) installed on the top of the isolation plate (16), and a plurality of longitudinally arranged dispersion boxes (22). The gas pump (21) has its suction end connected to the connecting box (17) and its outlet end connected to the lowest dispersion box (22). The plurality of dispersion boxes (22) are connected to each other through gas delivery pipes (23). Each dispersion box (22) is connected to the corresponding dispersion component through an outlet pipe (24) to evenly distribute ozone to the plurality of dispersion pipes (12).

5. The multi-site ozone catalytic oxidation decolorization tower for vat dye production wastewater according to claim 4, characterized in that, The bottom of the connecting box (17) is provided with an air inlet, and a solenoid valve I (19) is installed in the air inlet. The side wall of the connecting box (17) is provided with an air receiving pipe (18), and a solenoid valve II (20) is installed in the air receiving pipe (18). When the solenoid valve II (20) is closed and the solenoid valve I (19) is open, the unreacted ozone gas in the decolorization tower body (4) is drawn into the connecting box (17) through the air inlet and circulated to the dispersion pipe (12) by the gas pump (21) to improve the ozone utilization rate.

6. The multi-site ozone catalytic oxidation decolorization tower for vat dye production wastewater according to claim 1, characterized in that, The ultrasonic component includes multiple ultrasonic oscillating plates (29) fixedly installed on the inner surface of the side wall of the decolorization tower body (4) and a control display (30). The control display (30) has a built-in ultrasonic module and is electrically connected to the ultrasonic oscillating plate (29) through wires. The ultrasonic waves generated by the ultrasonic oscillating plate (29) are used to break the liquid film around the ozone bubbles, making the bubbles finer.

7. The multi-site ozone catalytic oxidation decolorization tower for vat dye production wastewater according to claim 2, characterized in that, A flow pipe (25) is fixedly installed at the bottom end of the connecting pipe (10) located at the bottom. The bottom ends of multiple flow pipes (25) are fixedly installed with the same diverting ring (26). The diverting ring (26) is fixed on the inner wall of the decolorization tower body (4). A support frame (27) is fixed on multiple flow pipes (25). A liquid level sensor (28) for detecting the liquid level is installed on the support frame (27).

8. The multi-site ozone catalytic oxidation decolorization tower for vat dye production wastewater according to claim 1, characterized in that, The decolorization tower also includes a liquid pump (33) and a transparent transfer box (34). The suction end of the liquid pump (33) is connected to the liquid outlet port (31) through a flow pipe (32). The water outlet end of the liquid pump (33) is connected to the transparent transfer box (34). The top of the transparent transfer box (34) is connected to the top of the decolorization tower body (4) through a return pipe (36) to form a wastewater circulation loop. An ozone detection sensor (42) is installed at the bottom of the transparent transfer box (34) to detect the ozone content in the wastewater.

9. The multi-site ozone catalytic oxidation decolorization tower for vat dye production wastewater according to claim 8, characterized in that, The liquid outlet port (31) is equipped with a solenoid valve III (38) located above the flow pipe (32), the return pipe (36) is equipped with a solenoid valve V (40), the bottom of the flow pipe (32) is connected to a water inlet pipe (37), the water inlet pipe (37) is equipped with a solenoid valve VI (41), the side wall of the transparent transfer box (34) is provided with a water outlet connector (35), the water outlet connector (35) is equipped with a solenoid valve IV (39), the liquid pump (33), solenoid valve III (38), solenoid valve IV (39), solenoid valve V (40) and solenoid valve VI (41) are all electrically connected to the control display (30) through wires.

10. The multi-site ozone catalytic oxidation decolorization tower for vat dye production wastewater according to claim 1, characterized in that, The side wall of the diversion box (6) is fixedly installed with multiple conveying bends (7) at equal intervals. Each conveying bend (7) is connected to an independent Venturi tube assembly. The conical reaction tube (9) in the Venturi tube assembly is fixed to the inner wall of the decolorization tower body (4) by an assembly bracket (8).

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