A magnetic-acoustic combined ozone catalytic oxidation system and method
Through magnetic-acoustic combined technology in the ozone catalytic oxidation system, magnetic field and ultrasonic technology are used to accelerate catalyst regeneration and increase the contact time between catalyst and wastewater, solving the problems of insufficient catalyst activity and high cost in the existing system, and achieving efficient wastewater deal with.
Patent Information
- Application Number
- CN202010552114.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-06-17
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2040-06-17
AI Technical Summary
In the existing ozone catalytic oxidation system, the contact time between the gas-liquid mixture and the solid catalyst is short, the catalytic oxidation depth is insufficient, and the formation of an organic film on the surface of the catalyst support reduces the service life of the catalyst and increases production costs.
Using magnetic-acoustic combined ozone catalytic oxidation system, the catalyst is regenerated by magnetic field, acoustic energy converter, sand extraction and sand washing system and pressurized dissolved system, magnetic field and ultrasonic technology are used to regenerate the catalyst, increase the ozone utilization rate, and pass through the sand extraction tube. The shaftless spiral increases the contact area between the catalyst particles and the wall surface and cleans the surface suspended substance.
It improves the activity of the catalyst and the utilization rate of ozone, extends the service life of the catalyst, reduces production costs, and improves the efficiency of wastewater treatment.
Smart Images
Figure CN111704308B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of sewage treatment, and in particular to a magnetic-acoustic combined ozone catalytic oxidation system and method. Background Art
[0002] With the progress of my country's economy and society, urbanization and industrial development have led to an increase in the discharge of industrial wastewater and domestic sewage. In particular, some industrial wastewater contains difficult-to-degrade organic matter (B / C is less than 0.3, or contains toxic substances that are difficult to be biochemically treated). It is difficult to achieve discharge standards even if biochemical treatment processes are used. Physical and chemical means must be used to pre-treat or deeply treat the difficult-to-degrade wastewater to improve the biodegradability of the wastewater or to achieve final discharge standards.
[0003] For ozone catalytic oxidation systems, most systems and methods currently focus on improving catalyst activity, changing gas-liquid flow direction or improving device properties to increase ozone utilization and reaction efficiency. However, there are few reports on systematically combining devices and processes to improve ozone utilization and treatment efficiency.
[0004] The background technologies retrieved by the applicant include:
[0005] 1. By changing the gas-liquid flow direction from gas-liquid co-flow to gas-liquid counter-flow, the contact time between the gas-liquid mixture and the solid catalyst can be increased (such as patent document with application number 200820181029.4);
[0006] 2. By adding a floating component, the solid catalyst is suspended and flows upward together with the gas-liquid mixture, thereby increasing the contact time of the gas-liquid-solid three phases (such as the patent document with application number 201510440580.0);
[0007] 3. By providing an inner cylinder in the tower and adding baffles, the number of deflections and flow time of the gas-liquid-solid three-phase in the tower are increased, thereby achieving the purpose of extending the catalytic oxidation time (such as the patent document of application number 201410775077.6);
[0008] The above-mentioned prior art has the following technical problems to varying degrees: first, the contact time between the gas-liquid mixture and the solid catalyst is relatively short, and the catalytic oxidation depth is insufficient; second, after a period of reaction, an organic film will be generated on the surface of the carrier with the catalyst. If it is not handled in time, the service life of the catalyst will be reduced and the production cost will be increased.
[0009] 4. Patent document with application number 201410356624.7 improves the traditional ozone catalytic oxidation device and designs an improved reaction device, which divides the reaction zone into three areas through a guide tube, changes the flow direction of ozone and water, and drives the catalyst in a circulating fluidized state, thereby increasing the porosity of the catalyst layer and increasing the contact time of organic wastewater on the catalyst.
[0010] The prior art has the following disadvantages: the device cost is relatively high, the activated carbon is easy to block the pipeline during the flow process, and the activated carbon is widely dispersed in the three areas, which increases the difficulty of cleaning when deactivating and replacing. Summary of the invention
[0011] In view of the deficiencies in the prior art, the present invention provides a magnetic-acoustic combined enhanced ozone catalytic oxidation system and method, which uses a magnetic field, an acoustic energy converter, a sand lifting and washing system, and a pressurized dissolved air system to orderly arrange pollutants in sewage under the action of the magnetic field, accelerate catalyst regeneration, and improve ozone utilization.
[0012] The present invention achieves the above technical objectives through the following technical means.
[0013] A magnetic-acoustic combined ozone catalytic oxidation system, comprising a water inlet pipe, a water distribution system, a reflux water collection system, a sand lifting pipe and a reaction tube; the bottom of the reaction tube is a conical structure;
[0014] The water distribution system and the reflux water collection system are arranged in parallel in the reaction cylinder, and the water distribution system is arranged below the reflux water collection system; a sand lifting pipe is also arranged in the reaction cylinder, and the sand lifting pipe passes through the reflux water collection system from top to bottom and extends to the bottom of the water distribution system; the upper end of the sand lifting pipe is arranged in the separator, and the lower end of the sand lifting pipe is provided with a conical second sand guide cone, the conical second sand guide cone and the conical structure below the reaction cylinder form a space A, and there is a certain gap between the conical second sand guide pile and the reaction cylinder, and the catalyst in the catalyst packing layer enters the space A through the gap; an air inlet pipe is arranged in the space A, and high-pressure gas enters the space A through the air inlet pipe, so that the space A forms a "vacuum", thereby sucking the catalyst packing particles in the sand guide cone into the sand lifting pipe; the catalyst particles whose activity is restored fall into the catalyst packing layer from the gap between the separator and the sand lifting pipe.
[0015] Furthermore, a first sand guide pile is provided in the middle section of the sand lifting pipe, and an acoustic energy converter is provided between the first sand guide pile and the second sand guide pile.
[0016] Furthermore, a magnetic ring is arranged around the inner wall of the reaction cylinder.
[0017] Furthermore, the reflux water collection system is connected to a reflux pipe, and the reflux pipe is connected to the water inlet of the vortex water pump.
[0018] Furthermore, the water inlet end of the vortex water pump is also connected to the ozone generator output pipe.
[0019] Furthermore, the vortex water pump mixes and pressurizes the reflux water and ozone in the reaction cylinder, and then injects the mixture into the water inlet pipe of the reaction cylinder through the water outlet pipe of the vortex water pump.
[0020] Furthermore, the separator is arranged at an upper position inside the reaction tube, and a drainage weir groove is arranged inside the separator, and the drainage weir groove is connected to the slag discharge pipe.
[0021] Furthermore, a shaftless spiral is arranged in the sand lifting pipe.
[0022] Furthermore, the ultrasonic generator is connected to the acoustic energy converter through a wire; the ultrasonic generator is arranged outside the reaction cylinder, and the frequency emitted is 30-40 Hz.
[0023] The method of the magnetic-acoustic combined ozone catalytic oxidation system comprises the following steps:
[0024] Step 1: The sewage in the water inlet pipe is mixed with the high-pressure dissolved air water discharged by the vortex water pump, and then sprayed out by the water distribution system into the catalyst packing layer for purification;
[0025] Step 2: Part of the purified water is discharged from the drainage weir, and part of it enters the return pipe through the return water collection system. After being pressurized with ozone in the vortex water pump, it forms high-pressure dissolved air water and is injected into the water inlet pipe;
[0026] Step 3: Under the action of gravity, the catalyst filler passes through the gap between the first sand guide cone and the reaction tube and enters between the first sand guide cone and the second sand guide cone. Under the action of ultrasonic waves, the covering on the surface of the catalyst filler is loosened and peeled off; the ultrasonic waves are provided by the acoustic energy converter;
[0027] Step 4: The high-speed airflow below the second sand guide cone drives the catalyst filler into the sand lifting pipe, and the "negative pressure" below the second sand guide cone sucks the catalyst filler and the surface covering of the filler between the first sand guide cone and the second sand guide cone into the bottom space A of the second sand guide cone through the gap between the second sand guide cone and the reaction tube;
[0028] Step 5: Under the combined action of gas and liquid, the catalyst filler in the sand lifting tube rubs violently with the gas and liquid, and collisions occur between filler particles and between the filler and the shaftless spiral. The suspended matter covering the surface of the filler is further cleaned and rises to the separator with the water flow and air flow;
[0029] Step 6: The further cleaned catalyst filler falls into the catalyst filler layer from the gap between the separator and the sand lifting pipe, starting a new cycle.
[0030] In step six), the bubbles in the separator adhere to the surface of the suspended matter, enter the slag discharge weir, and are discharged through the slag discharge pipe.
[0031] Beneficial effects:
[0032] 1. The present invention is a magnetic-acoustic combined ozone catalytic oxidation system, which uses a magnetic field, an acoustic energy converter, a sand lifting and washing system, and a pressurized gas dissolving system to arrange pollutants in sewage in an orderly manner under the action of a magnetic field, accelerate catalyst regeneration, and improve the utilization rate of ozone.
[0033] 2. The catalyst packing layer intercepts particulate matter during the sewage purification process, and the surface is covered with suspended matter, gradually losing its catalytic activity. Under the action of gravity, the catalyst packing enters space A through the gap between the reaction tube and the first sand guide cone, and the suspended matter and catalyst packing attached to the surface of the catalyst particles are peeled off by the acoustic energy converter to restore the catalyst activity. The catalyst particles enter through the sand lifting pipe, rotate upward in the hollow sand lifting pipe, and are repeatedly acted on by gas-liquid mixed water, thereby further cleaning the suspended matter on the surface of the catalytic particles, thereby restoring the activity of the catalyst.
[0034] 3. Ozone and reflux water are pressurized by a vortex water pump to form high-pressure dissolved air water, which is injected into the water inlet pipe of the reaction cylinder and released into the packing layer through a water distributor to form nano ozone bubbles, which increases the contact area between ozone and sewage and pollutants, improves oxidation efficiency, reduces ozone dosage, and thus reduces production costs.
[0035] 4. In the present invention, a shaftless spiral is arranged inside the sand lifting pipe, which increases the contact area between the catalyst particles and the inner wall of the sand lifting pipe on the one hand, and increases the travel of the catalyst particles in the sand lifting pipe on the other hand, so that the suspended matter on the surface of the catalyst particles can be removed more efficiently.
[0036] 5. Without reducing the overall process capacity, the technical measure of setting up a reflux pipe improves the processing capacity and efficiency of the catalyst and improves the utilization rate of ozone. BRIEF DESCRIPTION OF THE DRAWINGS
[0037] Figure 1 Schematic diagram of the overall structure according to an embodiment of the present invention.
[0038] Reference numerals:
[0039] 1-water inlet pipe; 2-water distribution system; 3-catalyst packing layer; 4-water outlet weir; 5-drainage pipe; 6-reflux water collection system; 7-reflux pipe; 8-ozone generator; 9-vortex water pump; 10-pressure gauge; 11-first sand guide cone; 12-acoustic energy converter; 13-second sand guide cone; 14-air inlet pipe; 15-sand lifting pipe; 16-support frame; 17-drainage weir; 18-slag discharge pipe; 19-reaction tube top plate; 20-reactor; 21-first support plate; 22-magnetic ring; 23-reaction tube; 24-second support plate; 25-ultrasonic generator; 27-air outlet pipe. DETAILED DESCRIPTION
[0040] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.
[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, 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, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.
[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0043] The following first describes in detail the embodiments of the present invention with reference to the accompanying drawings.
[0044] A magnetic-acoustic combined ozone catalytic oxidation system, comprising a water inlet pipe 1, a water distribution system 2, a reflux water collection system 6, a sand lifting pipe 15 and a reaction tube 23; the bottom of the reaction tube 23 is a conical structure; the water distribution system 2 and the reflux water collection system 6 are arranged in parallel in the reaction tube 23, and the water distribution system 2 is arranged below the reflux water collection system 6; the reaction tube 23 is also provided with a sand lifting pipe 15, the sand lifting pipe 15 passes through the water distribution system 6 and extends to the bottom of the reflux water collection system 6; the upper end of the sand lifting pipe 15 is arranged in the separator 20, and the lower end of the sand lifting pipe 15 is provided with a conical second guide The sand cone 13, the conical second sand guide cone 13 and the conical structure below the reaction tube 23 form a space A, and there is a certain gap between the conical second sand guide pile 13 and the reaction tube 23, and the catalyst in the catalyst packing layer 3 enters the space A through the gap; an air inlet pipe 14 is arranged in the space A, and high-pressure gas enters the space A through the air inlet pipe 14, so that the space A forms a "vacuum", thereby sucking the catalyst packing particles in the sand guide cone 13 into the sand lifting pipe 15; the catalyst particles with restored activity fall into the catalyst packing layer 3 from the gap between the separator 20 and the sand lifting pipe 15.
[0045] Furthermore, a first sand guide pile 11 is provided in the middle section of the sand lifting pipe 15 , and an acoustic energy converter 12 is provided between the first sand guide pile 11 and the second sand guide pile 13 .
[0046] Furthermore, a magnetic ring is arranged around the inner wall of the reaction cylinder 23 .
[0047] Furthermore, the reflux water collection system 6 is connected to a reflux pipe 7, and ozone is passed through the reflux pipe 7.
[0048] Furthermore, the reflux pipe 7 is connected to the water inlet end of the vortex water pump 9 , and the vortex water pump 9 mixes water and ozone generated in the ozone generator 8 to form high-pressure dissolved air water, which is injected into the water inlet pipe 1 of the reaction tube 23 .
[0049] Furthermore, the separator 20 is disposed at an upper position inside the reaction tube 23 , and a drainage weir 17 is disposed inside the separator 20 , and the drainage weir 17 is communicated with the slag discharge pipe 18 .
[0050] Furthermore, the sand lifting pipe 15 is a hollow spiral tube.
[0051] Furthermore, the ultrasonic generator 25 is connected to the acoustic energy converter 12 through a wire; the ultrasonic generator 25 is arranged outside the reaction tube 23, and the frequency emitted is 30-40 Hz.
[0052] The method of the magnetic-acoustic combined ozone catalytic oxidation system comprises the following steps:
[0053] Step 1: The sewage in the water inlet pipe 1 is mixed with high-pressure dissolved air water and then sprayed out by the water distribution system 2 into the catalyst packing layer 3 for purification;
[0054] Step 2: A portion of the purified water is discharged, and a portion enters the return pipe 7 through the return water collection system 6, and after being pressurized with ozone in the vortex water pump 9, high-pressure dissolved air water is formed and injected into the water inlet pipe 1;
[0055] Step 3: Under the action of gravity, the catalyst filler passes through the gap between the first sand guide cone 11 and the reaction tube 23 and enters between the first sand guide cone 11 and the second sand guide cone 13. Under the action of ultrasonic waves and high-pressure gas, the covering on the surface of the catalyst filler is loosened and peeled off; the ultrasonic waves are provided by the acoustic energy converter 12;
[0056] Step 4: The high-speed airflow below the second sand guide cone 13 drives the catalyst filler into the sand lifting pipe 15, and forms a vacuum below the second sand guide cone 13, covering the catalyst filler and the detached surface between the first sand guide cone 11 and the second sand guide cone 13, and sucking it into the bottom space A of the second sand guide cone 13 through the gap between the second sand guide cone 13 and the reaction tube 23;
[0057] Step 5: Under the combined action of gas and liquid, the suspended matter covering the surface of the catalyst filler in the sand lifting pipe 15 is further cleaned and rises to the separator 20;
[0058] Step 6: The further cleaned catalyst filler falls into the catalyst filler layer 3 from the gap between the separator 20 and the sand lifting pipe 15, and a new cycle begins.
[0059] Furthermore, in step six, the bubbles in the separator 20 adhere to the surface of the suspended matter, enter the slag discharge weir 7, and are discharged through the slag discharge pipe 18.
[0060] Working process:
[0061] The sewage from the water inlet pipe 1 merges with the gas-liquid mixed water returned from the return pipe 7 and enters the water distribution system 2, and is purified in the catalyst packing layer 3. The purified sewage enters the water outlet weir 4 and is discharged through the drain pipe 5.
[0062] The suspended matter trapped in the sewage purification process moves downward along with the packing layer, enters the cone bucket of the reaction tube 23 through the gap between the sand guide cone 11 and the reaction tube 23, and under the action of the acoustic energy converter 12, the covering on the surface of the catalyst filler particles is peeled off from the filler, and the catalyst activity is restored. High-pressure air passes through the air inlet pipe 14 and enters the sand guide cone 13 at the cone bucket at the bottom of the reaction tube 23, forming a "vacuum" between the sand guide cone 13 and the cone bucket at the bottom of the reaction tube 23, sucking the catalyst filler particles outside the sand guide cone 13 into the sand lifting pipe 15, and the water, air and catalyst filler particles collide and flush with the shaftless spiral in the sand lifting pipe 15 many times, further cleaning the suspended matter covering the surface of the catalyst filler. In the separator 20, the bubbles adhere to the surface of the suspended matter, enter the slag discharge weir 17, and are discharged through the slag discharge pipe 18. The reactivated catalyst falls into the packing layer from the gap between the separator 20 and the sand lifting pipe 15, and a new cycle begins.
[0063] In order to enhance the treatment effect, a magnetic ring 22 is provided on the inner wall of the reaction tube 23. The ozone and the return water from the ozone generator 8 are mixed by the vortex water pump 9. The pressure gauge 10 behind the vortex water pump 9 is used to display the pressure after the pump. The system requires the pressure after the pump to be above 0.5Mpa.
[0064] The ultrasonic generator 25 is external and emits a frequency of 30-40 Hz.
[0065] The inductance of magnetic ring 22 is not less than 60.0L / N², the relative magnetic permeability is 10μo, and the outside is coated with epoxy coating.
[0066] The top plate 19 of the reaction tube is used to support the reactor 20, the first support plate 21 and the second support plate 22 are used to support the sand lifting pipe 15 and the slag discharge pipe 18 respectively, and the support frame 16 is used to support the lower end of the reaction tube.
[0067] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.
[0068] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.
Claims
1. A magnetic-acoustic combined ozone catalytic oxidation method, characterized in that: The invention comprises a water distribution system (2), a reflux water collection system (6), a sand lifting pipe (15) and a reaction cylinder (23); the bottom of the reaction cylinder (23) is a conical structure; the middle section of the sand lifting pipe (15) is provided with a first sand guide cone (11), and an acoustic energy converter (12) is provided between the first sand guide cone (11) and the second sand guide cone (13); the reflux water collection system (6) is connected to a reflux pipe (7), and ozone is passed through the end of the reflux pipe (7); the reflux pipe (7) is connected to the water inlet pipe of a vortex water pump (9), and the vortex water pump (9) mixes the reflux water and the ozone generated in the ozone generator (8) to form high-pressure dissolved gas water, which is injected into the water inlet pipe (1) of the reaction cylinder; the water distribution system (2) and the reflux water collection system (6) are arranged in parallel in the reaction cylinder (23), and the water distribution system (2) is arranged below the reflux water collection system (6); the reaction cylinder (23) is also provided with a sand lifting pipe (12). A sand pipe (15), the sand lifting pipe (15) passes through the water distribution system (2) and extends to the bottom of the return water collection system (6); the upper end of the sand lifting pipe (15) is arranged in the separator (20), and the lower end of the sand lifting pipe (15) is provided with a conical second sand guide cone (13), the conical second sand guide cone (13) and the bottom of the reaction tube (23) form a space A, and there is a certain gap between the conical second sand guide cone (13) and the reaction tube (23), and the catalyst particles in the catalyst packing layer (3) enter the space A through the gap; an air intake pipe (14) is arranged in the space A, and high-pressure gas enters the space A through the air intake pipe (14), so that a "vacuum" is formed locally near the high-speed airflow, thereby sucking the catalyst particles in the space A into the sand lifting pipe (15); the catalyst particles whose surfaces have been cleaned fall into the catalyst packing layer (3) from the gap between the separator (20) and the sand lifting pipe (15); The following steps are also included: Step 1: The sewage in the water inlet pipe (1) is mixed with the high-pressure dissolved air water discharged by the vortex water pump (9), and then sprayed out by the water distribution system (2) into the catalyst packing layer (3) for purification; Step 2: A portion of the purified water is discharged from the drainage weir (4), and a portion enters the return pipe (7) through the return water collection system (6), and is pressurized with ozone in the vortex water pump (9) to form high-pressure dissolved air water that is injected into the water inlet pipe (1); Step 3: Under the action of gravity, the catalyst filler passes through the gap between the first sand guide cone (11) and the reaction tube (23) and enters between the first sand guide cone (11) and the second sand guide cone (13), and the covering on the surface of the catalyst filler is loosened and peeled off under the action of ultrasonic waves; the ultrasonic waves are provided by the acoustic energy converter (12); Step 4: The high-speed airflow below the second sand guide cone (13) drives the catalyst filler into the sand lifting pipe (15), and the "negative pressure" below the second sand guide cone (13) causes the catalyst filler and the surface covering material that falls off the filler between the first sand guide cone (11) and the second sand guide cone (13) to be sucked into the bottom space A of the second sand guide cone (13) through the gap between the second sand guide cone (13) and the reaction tube (23); Step 5: Under the combined action of gas and liquid, the catalyst filler in the sand lifting pipe (15) rubs violently with the gas and liquid, and collisions occur between filler particles and between the filler and the shaftless spiral. The suspended matter covering the surface of the filler is further cleaned and rises to the separator (20) along with the water flow and air flow. Step 6: The further cleaned catalyst filler falls into the catalyst filler layer (3) from the gap between the separator (20) and the sand lifting pipe (15), and a new cycle begins.
2. The magnetic-acoustic combined ozone catalytic oxidation method according to claim 1, characterized in that: The inner wall of the reaction cylinder (23) is surrounded by a magnetic ring.
3. The magnetic-acoustic combined ozone catalytic oxidation method according to claim 1, characterized in that: The separator (20) is arranged at an upper position inside the reaction cylinder (23), and a drainage weir groove (17) is arranged inside the separator (20), and the drainage weir groove (17) is connected to the slag discharge pipe (18).
4. The magnetic-acoustic combined ozone catalytic oxidation method according to claim 1, characterized in that: A shaftless spiral is arranged in the sand lifting pipe (15).
5. The magnetic-acoustic combined ozone catalytic oxidation method according to claim 1, characterized in that: The ultrasonic generator (25) is connected to the acoustic energy converter (12) via a wire; the ultrasonic generator (25) is arranged outside the reaction cylinder (23), and the frequency emitted by the ultrasonic generator (25) is 30-40 Hz.
6. The magnetic-acoustic combined ozone catalytic oxidation method according to claim 1, characterized in that: In step six, the bubbles in the separator (20) adhere to the surface of the suspended matter, enter the slag discharge weir (17), and are discharged through the slag discharge pipe (18).