Ozone catalytic oxidation wastewater treatment system

Abstract

The invention discloses a catalytic ozonation wastewater treatment system, which comprises an ozone pipeline, a gas-liquid mixing cavity, a catalytic ozonation reaction cylinder and a water-gas separation device, the gas-liquid mixing cavity is provided with a gas inlet and a water inlet, and the gas-liquid mixing cavity is communicated with the catalytic ozonation reaction cylinder through a water-gas jet orifice; the ozone pipeline is communicated with the gas inlet; a permanent magnet is arranged on the side wall of the gas-liquid mixing cavity, a paddle rotationally assembled through a paddle center shaft is arranged in the gas-liquid mixing cavity, the paddle is a conductor, and an ozone catalyst layer is arranged on the surface of the paddle; the ozone catalytic oxidation reaction cylinder is communicated with an inlet of the water-gas separation device through a water passing pipe, the water-gas separation device is provided with a water outlet and an exhaust end, and the exhaust end is communicated with the ozone pipeline through a second tail gas recovery pipeline. By adopting the catalytic ozonation wastewater treatment system disclosed by the invention, the ozone mass transfer effect, the ozone utilization rate and the catalytic oxidation efficiency are improved, and meanwhile, the pollution of ozone tail gas is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to an ozone catalytic oxidation wastewater treatment system. Background Art

[0002] Advanced oxidation technology (AOPs for short) is a technology that produces a large number of free radicals with strong oxidizing ability under the conditions of catalysts, light, electricity, etc., and oxidizes organic pollutants in sewage, thereby achieving efficient degradation and treatment. At present, commonly used advanced oxidation technologies include ozone catalytic technology, electrocatalytic technology, photocatalytic technology, etc. Under the action of catalysts, ozone produces active groups such as hydroxyl free radicals, which have a high redox potential in water and strong oxidizing properties, making them suitable for sewage treatment. In addition, ozone degradation of pollutants will not cause secondary pollution, so it is known as the "ideal green strong oxidant." However, ozone has low solubility in water, poor mass transfer effect, low ozone utilization rate, low catalytic oxidation efficiency, and ozone tail gas threatens environmental safety and requires further treatment. These problems limit the large-scale application of ozone catalytic oxidation technology in the field of water treatment. Summary of the invention

[0003] In order to overcome the deficiencies in the prior art, the present invention aims to provide an ozone catalytic oxidation wastewater treatment system to improve the ozone mass transfer effect, ozone utilization rate and catalytic oxidation efficiency, while reducing ozone tail gas pollution.

[0004] The present invention solves the above problems by the following technical means:

[0005] An ozone catalytic oxidation wastewater treatment system comprises an ozone pipeline, a gas-liquid mixing chamber, an ozone catalytic oxidation reaction cylinder and a water-gas separation device, wherein the gas-liquid mixing chamber is provided with an air inlet and a water inlet, the gas-liquid mixing chamber is connected with the ozone catalytic oxidation reaction cylinder through a water-gas jet port, and the ozone pipeline is connected with the air inlet; a permanent magnet is provided on the side wall of the gas-liquid mixing chamber, a blade rotatably assembled through a blade center axis is provided in the gas-liquid mixing chamber, the blade is a conductor, and an ozone catalyst layer is provided on the surface of the blade; the ozone catalytic oxidation reaction cylinder is connected with the inlet of the water-gas separation device through a water pipe, the water-gas separation device is provided with a water outlet and an exhaust end, and the exhaust end is connected with the ozone pipeline through a second tail gas recovery pipeline.

[0006] In the process of implementing the above solution, the permanent magnets are arranged in pairs, arranged on the upper and lower sides or the front and rear sides of the gas-liquid mixing chamber; the material of the blades is stainless steel 316L.

[0007] In a possible embodiment, the water vapor separation device includes a water vapor separation cylinder and an exhaust pipe arranged in the middle of the water vapor separation cylinder, the inlet at the top of the water vapor separation cylinder is connected to the water pipe, the inner wall of the water vapor separation cylinder is provided with a guide spiral, the side wall of the exhaust pipe is provided with a plurality of exhaust holes at vertical intervals, and the exhaust pipe is connected to the second exhaust gas recovery pipeline; the water outlet is arranged at the bottom of one side wall of the water vapor separation cylinder.

[0008] In a possible implementation, the number of the exhaust holes is dense at the bottom and sparse at the top.

[0009] In a possible implementation, a plurality of X-shaped plates rotatably assembled through a central axis of the X-shaped plates are staggeredly arranged in the ozone catalytic oxidation reaction tube, and an ozone catalyst layer is arranged on the surface of the X-shaped plates.

[0010] In a possible implementation manner, the ozone catalytic oxidation reaction cylinder is connected to a second tail gas recovery pipeline through a first tail gas recovery pipeline.

[0011] In a possible implementation manner, the water pipe is connected to a return pipe, and one end of the return pipe away from the water pipe is connected to the ozone catalytic oxidation reaction cylinder.

[0012] In a possible implementation manner, a one-way guide plate is provided at the connection between the reflux pipe and the ozone catalytic oxidation reaction cylinder.

[0013] In a possible implementation manner, a valve is provided at the connection between the water pipe and the water-gas separation device.

[0014] In a possible implementation manner, a dryer is provided on the second tail gas recovery pipeline.

[0015] In a possible implementation, the ozone pipeline includes an oxygen source pipeline and an air intake pipeline that are connected, an ozone generator is provided on the air intake pipeline, and the air intake pipeline is connected to an air inlet.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The impact force of the water flow drives the blades in the gas-liquid mixing chamber to rotate. On the one hand, the rotation of the blades enhances the gas-liquid mixing effect. On the other hand, the rotation of the blades cuts the magnetic flux lines to produce an electromagnetic induction effect. The generated current enhances ozone catalysis. The coupling of electrocatalysis and ozone catalysis enriches the ·OH conversion pathway and improves the mass transfer efficiency and ozone utilization rate.

[0018] 2. Furthermore, staggered X-shaped plates are set in the ozone catalytic oxidation reaction tube, and ozone gathers under the X-shaped plates, which increases the residence time of ozone, prolongs the contact time between ozone and the catalyst on the X-shaped plates, and improves the utilization rate of ozone. As ozone accumulates and reacts, combined with the thrust of the water flow, the X-shaped plates will be driven to rotate, and the remaining ozone will be discharged, starting a new round of gas collection reaction.

[0019] 3. Furthermore, the recycling of ozone tail gas is achieved: ozone reacts initially in the gas-liquid mixing chamber, is further consumed in the ozone catalytic oxidation reaction cylinder, and the remaining ozone partially escapes from the liquid surface and is recovered and recycled through the first tail gas recovery pipeline and the second tail gas recovery pipeline. In this way, the ozone in the outlet water is greatly reduced.

[0020] 4. Furthermore, there is a certain height difference between the ozone catalytic oxidation reaction cylinder and the water vapor separation cylinder, and the water treated by ozone catalytic oxidation flows into the water vapor separation cylinder by gravity without the need for additional power. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 It is a schematic structural diagram of a preferred embodiment of the present invention.

[0023] 1. Oxygen source pipeline, 2. Ozone generator, 3. Air inlet pipeline, 4. Air inlet, 5. Water inlet, 6. Permanent magnet, 7. Water vapor jet port, 8. Blade center axis, 9. Blade, 10. Gas-liquid mixing chamber, 11. Ozone catalytic oxidation reaction cylinder, 12. X-shaped plate, 13. X-shaped plate center axis, 14. Dryer, 15. First tail gas recovery pipeline, 16. Second tail gas recovery pipeline, 17. Valve, 18. Water pipe, 19. Exhaust pipe, 20. Exhaust hole, 21. Water-gas separation cylinder, 22. Guide spiral, 23. Water outlet, 24. One-way guide plate, 25. Reflux pipe. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of description and simplified description of the present invention, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0027] like Figure 1 As shown, this embodiment provides an ozone catalytic oxidation wastewater treatment system, including an ozone pipeline, a gas-liquid mixing chamber 10, an ozone catalytic oxidation reaction cylinder 11 and a water-gas separation device, the gas-liquid mixing chamber 10 is provided with an air inlet 4 and a water inlet 5, the gas-liquid mixing chamber 10 is connected to the ozone catalytic oxidation reaction cylinder 11 through a water-gas jet port 7, and the ozone pipeline is connected to the air inlet 4; in this embodiment, the ozone pipeline includes a connected oxygen source pipeline 1 and an air inlet pipeline 3, an ozone generator 2 is provided on the air inlet pipeline, and the air inlet pipeline is connected to the air inlet; after oxygen is converted into ozone, it flows into the gas-liquid mixing chamber from the air inlet.

[0028] A permanent magnet 6 is provided on the side wall of the gas-liquid mixing chamber 10, and a blade 9 is provided in the gas-liquid mixing chamber and is rotatably assembled through the blade center axis 8. The blade is a conductor, and an ozone catalyst layer is provided on the surface of the blade. The blade rotates under the impact of the water flow, and the movement direction of the blade 9 is perpendicular to or intersecting with the magnetic flux lines generated by the permanent magnet 6.

[0029] In this embodiment, the permanent magnets are arranged in pairs, at the upper and lower sides or the front and rear sides of the gas-liquid mixing chamber; the material of the blades is stainless steel 316L.

[0030] The ozone catalytic oxidation reaction cylinder 11 is connected to the inlet of the water-gas separation device through a water pipe 18, and a valve 17 is provided at the connection between the water pipe and the water-gas separation device for controlling the flow. The water-gas separation device is provided with a water outlet 23 and an exhaust end, and the exhaust end is connected to the ozone pipeline through a second tail gas recovery pipeline 16, and a dryer 14 is provided on the second tail gas recovery pipeline. The ozone catalytic oxidation reaction cylinder is connected to the second tail gas recovery pipeline through a first tail gas recovery pipeline 15; in this embodiment, the water-gas separation device includes a water-gas separation cylinder 21 and an exhaust pipe 19 provided in the middle of the water-gas separation cylinder, and the water-gas separation The inlet from the top of the cylinder is connected to the water pipe, the inner wall of the water-gas separation cylinder is provided with a guide spiral 22, the side wall of the exhaust pipe is provided with a plurality of exhaust holes 20 at vertical intervals, and the exhaust pipe is connected to the second tail gas recovery pipeline; the water outlet is arranged at the bottom of one side wall of the water-gas separation cylinder; the number of the exhaust holes is dense at the bottom and sparse at the top, so as to meet the discharge demand of the large ozone distribution in the lower part; during specific operation, the first tail gas recovery pipeline 15 collects the remaining ozone emitted from the ozone catalytic oxidation reaction cylinder, and the second tail gas recovery pipeline 16 collects the tail gas obtained by gas-water separation, and the tail gas is dried by the dryer 14 and then enters the ozone generator 2 again for reuse.

[0031] In a possible implementation, a plurality of X-plates 12 are staggeredly arranged in the ozone catalytic oxidation reaction cylinder and are rotatably assembled through the X-plate central axis 13, and an ozone catalyst layer is arranged on the surface of the X-plate; the X-plate 12 is driven by the water flow and can rotate around the X-plate central axis.

[0032] In this embodiment, the ozone catalyst layer is attached and fixed by an electrodeposition method, and the main active substance of the catalyst is iron-manganese oxide.

[0033] In a possible embodiment, the water pipe 18 is connected to a return pipe 25, and the end of the return pipe away from the water pipe is connected to the ozone catalytic oxidation reaction cylinder. A one-way guide plate 24 is provided at the connection between the return pipe and the ozone catalytic oxidation reaction cylinder; water flows unidirectionally from the return pipe 25 to the ozone catalytic oxidation reaction cylinder.

[0034] The following is further explained in a more specific way:

[0035] Wastewater from a pharmaceutical factory was used, and the COD concentration was 81 mg / L. The wastewater enters the gas-liquid mixing chamber from the water inlet 5, and the oxygen transported by the oxygen source pipeline 1 generates ozone through the ozone reactor 2. The ozone enters the gas-liquid mixing chamber from the air inlet 4, and the gas-liquid flow drives the blade to rotate. Through the stirring action of the blade, the water vapor is fully mixed in the gas-liquid mixing chamber and reacts with the ozone catalyst on the surface of the blade. The mixture after the initial reaction enters the ozone catalytic oxidation reaction cylinder from the water vapor jet port 7. The ozone gathers at the bottom of the X-shaped plate and continues to react with the ozone catalyst on the X-shaped plate. When the gas accumulates to a certain amount, the X-plate rotates to discharge the ozone, and a new round of gas collection and catalytic reaction begins.

[0036] The water flows into the gas-liquid separation cylinder through the water pipe 18, and flows out from the water outlet under the guidance of the guide spiral, and the ozone escaping from the water is discharged from the exhaust pipe 19; the exhaust gas emitted from the ozone catalytic oxidation reaction cylinder and the exhaust gas discharged from the exhaust pipe are respectively recovered through the first exhaust gas recovery pipeline 15 and the second exhaust gas recovery pipeline 16, and after being dried by the dryer 14, they enter the ozone generator and are recycled again.

[0037] At room temperature, the ozone catalytic oxidation reaction tube residence time is 45 minutes. After the reaction is completed, the COD content of the reactor effluent is 38 mg / L, and the COD removal rate is 56.80%, reaching the first level or above standard in the comprehensive sewage discharge standard (GB8978-1996).

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An ozone catalytic oxidation wastewater treatment system, characterized in that: It includes an ozone pipeline, a gas-liquid mixing chamber, an ozone catalytic oxidation reaction cylinder and a water-gas separation device. The gas-liquid mixing chamber is provided with an air inlet and a water inlet. The gas-liquid mixing chamber is connected with the ozone catalytic oxidation reaction cylinder through a water-gas jet port, and the ozone pipeline is connected with the air inlet; a permanent magnet is provided on the side wall of the gas-liquid mixing chamber, and a blade rotatably assembled through the central axis of the blade is provided in the gas-liquid mixing chamber, the blade is a conductor, and an ozone catalyst layer is provided on the surface of the blade; the ozone catalytic oxidation reaction cylinder is connected with the inlet of the water-gas separation device through a water pipe, the water-gas separation device is provided with a water outlet and an exhaust end, and the exhaust end is connected with the ozone pipeline through a second tail gas recovery pipeline.

2. The ozone catalytic oxidation wastewater treatment system according to claim 1 is characterized in that: The water-gas separation device includes a water-gas separation cylinder and an exhaust pipe arranged in the middle of the water-gas separation cylinder, the inlet at the top of the water-gas separation cylinder is connected to the water pipe, the inner wall of the water-gas separation cylinder is provided with a guide spiral, the side wall of the exhaust pipe is provided with a plurality of exhaust holes at vertical intervals, and the exhaust pipe is connected to the second exhaust gas recovery pipeline; the water outlet is arranged at the bottom of one side wall of the water-gas separation cylinder.

3. The ozone catalytic oxidation wastewater treatment system according to claim 2 is characterized in that: The number of the exhaust holes is dense at the bottom and sparse at the top.

4. The ozone catalytic oxidation wastewater treatment system according to claim 1, characterized in that: A plurality of X-shaped plates which are rotatably assembled through the central axis of the X-shaped plates are arranged in an interlaced manner in the ozone catalytic oxidation reaction cylinder, and an ozone catalyst layer is arranged on the surface of the X-shaped plates.

5. The ozone catalytic oxidation wastewater treatment system according to claim 1, characterized in that: The ozone catalytic oxidation reaction cylinder is connected to the second tail gas recovery pipeline through the first tail gas recovery pipeline.

6. The ozone catalytic oxidation wastewater treatment system according to claim 1, characterized in that: The water pipe is connected with a return pipe, and one end of the return pipe away from the water pipe is communicated with the ozone catalytic oxidation reaction cylinder.

7. The ozone catalytic oxidation wastewater treatment system according to claim 6, characterized in that: A one-way guide plate is arranged at the connection between the reflux pipe and the ozone catalytic oxidation reaction cylinder.

8. The ozone catalytic oxidation wastewater treatment system according to claim 1, characterized in that: A valve is provided at the connection between the water pipe and the water-gas separation device.

9. The ozone catalytic oxidation wastewater treatment system according to claim 8, characterized in that: The second tail gas recovery pipeline is provided with a dryer.

10. The ozone catalytic oxidation wastewater treatment system according to any one of claims 1 to 9, characterized in that: The ozone pipeline comprises an oxygen source pipeline and an air intake pipeline which are connected to each other. An ozone generator is arranged on the air intake pipeline, and the air intake pipeline is connected to an air inlet.

Images