A wastewater treatment system

Abstract

The present invention discloses a wastewater treatment system, including an ozone generation system. The ozone generation system includes an air source, which provides positive pressure air. After filtering and drying, the air is used to prepare ozone by an ozone generator. The obtained ozone is mixed with a high-speed fluid in a negative pressure ejector, and finally enters a reaction device through the ejector outlet to react with wastewater. The impact force of the high-speed mixed jet provided by the negative pressure ejector causes a large disturbance to the wastewater, thereby increasing the ozone diffusion and mass transfer rate and accelerating the ozone contact reaction. The present invention uses a negative pressure ejector to replace an aeration disk, reducing the pressure that the ozone gas from the ozone generator needs to overcome when it is added and used. At the same time, due to the use of the negative pressure ejector, the pressure requirement for ozone is reduced, thereby reducing the need for the air source to generate high-pressure air, thereby reducing unnecessary energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and in particular to a wastewater treatment system. Background Art

[0002] In the field of wastewater treatment, ozone, as a strong oxidant, is often used for advanced wastewater treatment. Compared to traditional processes, it possesses stronger oxidizing and disinfecting capabilities. It not only thoroughly sterilizes and disinfects, but also effectively removes a variety of difficult-to-degrade organic pollutants in wastewater. It also has deodorizing and decolorizing properties, making it a highly effective water treatment agent. However, due to its instability and easy decomposition, ozone cannot be stored as a product and must be produced on-site using an ozone generator.

[0003] Traditional processes can use air or oxygen as the gas source for the ozone generator for ozone preparation. When air source is used for ozone generation, compressed air is generated by an air compressor and stored in a pressure vessel. When the ozone generator is turned on, the high-pressure air in the pressure vessel enters the ozone generator after being dried, decompressed, and filtered. Under the action of the generator, it is converted into a mixed gas containing a certain concentration of ozone; the mixed gas is then transported to the aeration plate at the bottom through the gas pipeline distributed in the ozone reactor, so that the gas is evenly distributed in the reactor. After sufficient contact and reaction with the wastewater, the residual ozone will pass through the collection device at the top of the reactor and enter the exhaust destructor to avoid secondary pollution caused by ozone escape.

[0004] Conventional air-source ozone generation processes require an air compressor to generate high-pressure compressed air. This compressed air then needs to be depressurized before entering the ozone generator to ensure safe operation, a process that wastes unnecessary energy. Furthermore, high-pressure air must be stored in gas tanks, which require registration and inspection, often causing inconvenience in production management. Summary of the Invention

[0005] The present invention provides a wastewater treatment system, which can solve the above-mentioned defects in the prior art.

[0006] The technical solutions of the present invention are as follows:

[0007] A wastewater treatment system includes an ozone generation system. The ozone generation system includes an air source that provides positive-pressure air. The air is filtered and dried, and then produced by an ozone generator. The resulting ozone is mixed with a high-speed fluid in a negative-pressure ejector, and ultimately enters a reaction device through the outlet of the negative-pressure ejector to react with wastewater. The impact force of the high-speed mixed jet provided by the negative-pressure ejector significantly disturbs the wastewater, increasing the ozone diffusion and mass transfer rate while accelerating the ozone contact reaction. The use of a negative-pressure self-aspirating ejector in place of an aeration disk reduces the pressure that the ozone gas from the ozone generator must overcome when added. The use of the negative-pressure ejector also reduces the pressure requirement for ozone, thereby reducing the need for the air source to generate high-pressure air and thus reducing unnecessary energy consumption.

[0008] Preferably, the air source is a blower that provides positive-pressure air to the ozone generation system. Existing ozone generation systems generate high-pressure air through air compressors, which require storage in air tanks. These pressure vessels require registration and inspection, often causing inconvenience in production management. By directly providing pressurized air with a certain pressure through a blower, instead of the high-pressure compressed air produced by an air compressor, the inconvenience in production management and the potential safety issues associated with using pressure vessels are avoided.

[0009] Preferably, the air source is sequentially provided with a cooling device, a drying device, and an ozone generator. Each of the cooling device, the drying device, and the ozone generator is provided with at least one filter at its front end. The cooling device cools the air, the drying device dries the air, and the filter filters the air. Multiple filter devices perform graded filtration to meet the purity requirements of the back-end device. The air that has completed each stage of treatment is then used to produce ozone in the ozone generator.

[0010] Preferably, the cooling device is a cold dryer, which cools and dries the air; the drying device is an adsorption dryer, which further reduces the humidity in the air through the adsorption effect of the desiccant; the ozone generating device is an ozone generator for preparing ozone; the filtering device is a filter, and multiple filters perform graded filtration on the air to remove large particles, oil and small particles in the air.

[0011] Preferably, it also includes a buffer device for preventing liquid backflow, which is arranged between the ozone generator and the negative pressure ejector. When the system is deactivated, it is used to prevent the fluid in the reaction device from flowing back and causing damage to the ozone generator.

[0012] Preferably, the negative pressure ejector includes an ejector inlet, an ejector outlet, and an air inlet pipe, the outlet of the ozone generator being connected to the air inlet pipe, and the outlet of the negative pressure ejector being disposed within the reaction device. The negative pressure ejector also includes a circulation device, which, when in operation, transports fluid within the reaction device from the ejector inlet to the negative pressure ejector and ejects it at high speed from the ejector outlet, thereby generating negative pressure within the air inlet pipe to absorb ozone. Within the negative pressure ejector, the ozone mixes with the pressurized fluid provided by the circulation device, forming a high-speed gas-liquid mixed jet.

[0013] Preferably, the air inlet pipe is arranged at a predetermined position near the inlet end of the ejector, and an anti-backflow device is also provided on the air inlet pipe, which is used to prevent the fluid in the reaction device from backflowing from the air inlet pipe to the ozone generating device when the negative pressure ejector is deactivated.

[0014] Preferably, the anti-backflow device includes a gas inlet, an air inlet chamber, and a flow baffle. The air inlet chamber is fixed to the air inlet pipe, the flow baffle is disposed within the air inlet chamber, and the gas inlet is connected to the outlet of the ozone generator. When the air inlet pipe is in an inhalation state, gas enters the air inlet chamber from the gas inlet, passes through the flow baffle and the air inlet pipe, and enters the negative pressure ejector. The flow baffle can provide a certain flow blocking effect, cooperating with the air inlet chamber to prevent fluid backflow.

[0015] Preferably, the baffle comprises a closed end, an open end, and a connecting portion. The baffle is secured to the intake pipe via the connecting portion, with the closed end positioned above the intake pipe. The connecting portion is structured such that a plurality of holes are formed between the baffle and the intake pipe, allowing fluid to pass through. The baffle is constructed as an inverted cap that snaps onto the intake pipe, allowing ozone or fluid within the negative pressure ejector to flow in or out through the formed holes. This structure allows ozone to enter the negative pressure ejector smoothly and prevents fluid within the intake pipe from flowing back into the ozone generator, resulting in a simple structure and economical and practical advantages.

[0016] Preferably, the outlet of the negative pressure ejector is further provided with a plurality of branch tubes, each of which is evenly distributed along the circumference of the outlet. The gas-liquid mixture within the negative pressure ejector is ejected from the branch tubes into the reaction device. The high-speed gas-liquid mixture within the main body of the negative pressure ejector is ultimately dispersed through the umbrella-shaped branch tubes at the outlet end and enters the reaction device for contact reaction with the wastewater. The umbrella-shaped branch tube design increases the range of jet disturbance, resulting in more uniform distribution of ozone.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] First, the conventional air source ozone generation process requires an air compressor to generate high-pressure compressed air, and the compressed air needs to be reduced in pressure before entering the ozone generator to ensure the safe operation of the equipment. This process results in unnecessary energy waste. The ozone preparation system provided by the present invention uses a negative pressure self-priming ejector to replace the traditional aeration disk, which reduces the pressure that the ozone gas from the ozone generator needs to overcome when it is added and used, thereby ensuring that the front-end high-pressure blower can continuously meet the needs of ozone preparation by supplying air, thereby reducing unnecessary energy consumption.

[0019] Second, the existing system uses an air compressor to generate high-pressure air, which needs to be stored in an air tank. Such pressure vessels need to be reported and inspected, which often causes inconvenience in production management. The ozone preparation system provided by the present invention uses a blower to directly provide pressurized air with a certain pressure, replacing the high-pressure compressed air produced by the air compressor, avoiding the inconvenience in production management caused by the use of pressure vessels and a series of possible safety issues.

[0020] Third, the present invention adopts an ejector process, which can significantly enhance the mixing effect of ozone and wastewater compared to the traditional pool bottom aeration plate bubbling process. The utilization rate of ozone can reach 97-99%. The treatment system of the present invention can reduce energy consumption. At the same time, due to the high ozone utilization rate, the workload of the tail gas destruction device and the environmental pollution caused by ozone leakage are greatly reduced.

[0021] Fourth, in the bubbling reaction, since the hybrid power of the reaction is low, in order to ensure that the reaction is sufficient and complete, a longer hydraulic retention time and a larger reaction mixing tank body need to be set; the present invention uses an ejector instead of an aeration disk for aeration. The impact force of the high-speed mixing jet provided by the ejector can cause a greater disturbance to the wastewater, thereby increasing the ozone diffusion and mass transfer rate while accelerating the ozone contact reaction. The required reaction time is shortened to 1 / 4 of the original time, greatly reducing the volume of the reactor, thereby saving floor space.

[0022] Fifth, the ejector used in the present invention is provided with an anti-backflow structure on the suction pipe, which has a simple structure and will not have the same failure problem as the valve. At the same time, a buffer tank is added to the suction pipe. These two measures provide double insurance and effectively avoid the situation where the treated water flows back and damages the ozone generator when aeration stops.

[0023] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the structure of the wastewater treatment system of Example 1 of the present invention;

[0025] Figure 2 1 is a schematic structural diagram of a negative pressure ejector according to embodiment 1 of the present invention;

[0026] Figure 3 1 is a schematic structural diagram of a backflow prevention device according to embodiment 1 of the present invention;

[0027] Figure 4 is a bottom view of the baffle portion of Example 1 of the present invention;

[0028] Figure 5 is another bottom view of the baffle of Example 1 of the present invention;

[0029] Figure 6 Schematic diagram of the structure of the branch pipe at the outlet end of the ejector in Example 1 of the present invention;

[0030] Figure 7 2 is another schematic diagram of the structure of the branch pipe at the outlet end of the ejector of Example 1 of the present invention.

[0031] Reference numerals:

[0032] Air source 1; filtering device 2; cooling device 3; drying device 4; ozone generator 5; C-class filter 2.1; A-class filter 2.2; T-class filter 2.3; buffer device 6, negative pressure ejector 7; ejector inlet end 7.1; ejector outlet end 7.2; air inlet pipe 7.3; ejector body 7.4; diffuser section 7.5; branch pipe 7.2.1, reaction device 8; backflow prevention device 9; gas inlet 9.1; air inlet chamber 9.2; flow blocking portion 9.3; closed end 9.3.1; open end 9.3.2; connecting portion 9.3.3; hole 9.4; circulation device 10; exhaust gas destruction device 11. DETAILED DESCRIPTION

[0033] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0035] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only intended to illustrate the present invention and are not intended to limit the scope of protection of the present invention. Improvements and adjustments made by those skilled in the art in accordance with the present invention in actual applications still fall within the scope of protection of the present invention.

[0036] Example 1

[0037] A wastewater treatment system, see Figures 1 to 6 The ozone generating system includes an air source 1, which provides positive pressure air. After filtering and drying, the air is used to produce ozone by an ozone generating device 5. The resulting ozone is transported to a reaction device 8 via a negative pressure ejector 7 for wastewater treatment. Ozone is mixed with a high-speed fluid in the negative pressure ejector 7, and ultimately enters the reaction device 8 through the outlet of the negative pressure ejector 7 to react with the wastewater. The impact force of the high-speed mixed jet provided by the negative pressure ejector 7 causes a significant disturbance to the wastewater, increasing the ozone diffusion and mass transfer rate while accelerating the ozone contact reaction. The use of the negative pressure ejector 7 instead of the traditional aeration disk reduces the pressure that the ozone gas from the ozone generating device 5 must overcome when it is added and used. At the same time, due to the use of the negative pressure ejector 7, the ozone is mixed with a gas and liquid in the negative pressure ejector and ejected at high speed, thereby reducing the pressure requirement for the ozone, thereby reducing the need for the air source 1 to generate high-pressure air, and thus reducing unnecessary energy consumption.

[0038] Because existing ozone generating systems generate high-pressure air through air compressors, high-pressure air needs to be stored in air tanks. Such pressure vessels need to be reported and inspected, often causing inconvenience in production management. The negative pressure ejector 7 in this embodiment has a self-priming function. The air source 1 in this embodiment adopts a blower, which provides positive-pressure air to the ozone generating system. The blower directly provides pressurized air with a certain pressure, replacing the high-pressure compressed air produced by the air compressor, thereby avoiding the inconvenience in production management caused by the use of pressure vessels such as air tanks and a series of possible safety issues.

[0039] Taking the preparation of 1kg / h of ozone as an example, the traditional process requires the configuration of an 11kW air compressor. By replacing it with the high-pressure blower of this embodiment, only about 2kW is required, and the installed power is greatly reduced.

[0040] See also Figure 1 The air source 1 is sequentially provided with a cooling device 3, a drying device 4, and an ozone generator 5 at the rear end. Each of the cooling device 3, drying device 4, and ozone generator 5 is provided with at least one filter 2 at the front end. The cooling device 3 cools the air, the drying device 4 dries the air, and the filter 2 filters the air. The filter 2 filters the air to meet the purity requirements of the corresponding devices at the rear end. After multi-stage filtration, cooling, and drying, the air is passed through the ozone generator 5 to produce ozone.

[0041] Specifically, cooling device 3 is a cold dryer that cools and dries the air; drying device 4 is an adsorption dryer that further reduces the humidity in the air through the adsorption effect of a desiccant; and ozone generator 5 is an ozone generator that uses air as a raw material to produce a gas mixture containing ozone at a certain concentration. Filter device 2 is a filter. The filter at the front end of the cold dryer is a Class C filter 2.1, which removes large solid particles and removes oil from the air; the filter at the front end of the adsorption dryer is a Class A filter 2.2, which removes small solid particles and renders the air completely oil-free; and the filter at the front end of the ozone generator is a Class T filter 2.3, which provides further filtration. The Class C filter 2.1, Class A filter 2.2, and Class T filter 2.3 can be provided as a single filter or, if necessary, as needed to meet the purity requirements of the back-end device; this is not a limitation here. The specific models of the cold dryer, adsorption dryer, and ozone generator should be selected based on actual processing needs and overall economic costs; this is not a limitation here.

[0042] In this embodiment, a buffer device 6, such as a buffer tank, is further provided between the ozone generator 5 and the negative pressure ejector 7 to prevent liquid backflow. This prevents backflow of fluid in the reaction device 8 from damaging the ozone generator 5 when the system is deactivated.

[0043] See also Figure 1 、 Figure 2The negative pressure ejector 7 includes an ejector inlet 7.1, an ejector outlet 7.2, and an air inlet pipe 7.3. The outlet of the ozone generator 5 is connected to the air inlet 7.3 of the negative pressure ejector 7, and the ejector outlet 7.2 is disposed within the reaction unit 8. The apparatus also includes a circulation device 10, such as a circulating jet pump. The inlet of the circulation device 10 is connected to the reaction unit 8, and the outlet of the circulation device 10 is connected to the ejector inlet 7.1. When the circulation device 10 is in operation, the fluid within the reaction unit 8 is transported from the ejector inlet 7.1 into the negative pressure ejector 7 and ejected at high speed from the ejector outlet 7.2, generating a negative pressure in the air inlet 7.3 of the negative pressure ejector 7 to absorb ozone. Under the action of the negative pressure ejector 7, the ozone mixes with the pressurized fluid provided by the circulation device 10, forming a high-speed gas-liquid mixed jet.

[0044] The negative pressure ejector 7 includes an ejector body 7.4, the end of which is a curved pipe. The ejector inlet end 7.1 is arranged at the end of the curved pipe, and the air inlet pipe 7.3 is arranged at a predetermined position near the curved pipe. The ejector body 7.4 has a small diameter portion downward, which is used to increase the pressure within the ejector body 7.4. The other end of the ejector body 7.4 is a diffuser section 7.5. The radial dimension of the diffuser section 7.5 is slightly larger than the radial dimension of the small diameter portion. The length of the diffuser section 7.4 can be determined according to the actual depth of the tank body.

[0045] If the ozone generated by the ozone generator 5 is directly added to the water, it is generally necessary to connect a one-way valve to the outlet of the ozone generator 5 to prevent the treated wastewater from flowing back into the ozone generator. However, the valve is easily damaged and malfunctions due to corrosion and other reasons, thus losing its protective function. In this embodiment, an anti-backflow device 9 is also provided on the air inlet pipe 7.3, see Figure 1 、 Figure 2 When the negative pressure ejector 7 is deactivated, the fluid in the reaction device 8 is prevented from flowing back into the ozone generating device 5 through the air inlet pipe 7.3.

[0046] See also Figure 2 、 Figure 3 The backflow prevention device 9 includes a gas inlet 9.1, an air inlet chamber 9.2, and a flow barrier 9.3. The air inlet chamber 9.2 is fixed to the air inlet pipe 7.3, and the flow barrier 9.3 is disposed within the air inlet chamber 9.2. The gas inlet 9.1 is connected to the outlet of the ozone generator 5. When the air inlet pipe 7.3 is in the suction state, gas enters the air inlet chamber 9.2 from the gas inlet 9.1, passes through the flow barrier 9.3 and the air inlet pipe 7.3, and enters the negative pressure ejector 7. The flow barrier 9.3 can provide a certain flow barrier function, and the cooperation between the flow barrier 9.3 and the air inlet chamber 9.2 prevents the backflow of fluid.

[0047] For details, see Figures 3 to 5The baffle 9.3 includes a closed end 9.3.1, an open end 9.3.2 and a connecting portion 9.3.3. The baffle 9.3 is fixed to the air inlet pipe 7.3 through the connecting portion 9.3.3. The closed end 9.3.1 is located above the air inlet pipe 7.3. The structure of the connecting portion 9.3.3 forms a plurality of holes 9.4 between the baffle 9.3 and the air inlet pipe 7.3 to allow fluid to pass through.

[0048] In this embodiment, the baffle 9.3 is constructed as an inverted cap structure, which is buckled on the top of the air inlet pipe 7.3. The connecting portion 9.3.3 is a connecting rod and is evenly distributed along the circumference of the baffle 9.3, thereby forming hollow holes 9.4 to allow fluid to flow through. Figure 4 Of course, in other embodiments, the connecting portion 9.3.3 can also be constructed as a ring structure, see Figure 5 The baffle 9.3 is secured to the intake pipe 7.3 via an annular connecting portion 9.3.3. A plurality of holes 9.4 are provided around the circumference of the connecting portion 9.3.3. The ozone or fluid within the negative pressure ejector 7 can flow in or out through the holes 9.4. This structure allows ozone to flow smoothly into the negative pressure ejector 7 while preventing the fluid within the intake pipe 7.3 from flowing back into the ozone generator 5. This structure offers the advantages of a simple structure and economical practicality.

[0049] Preferably, the ejector outlet 7.2 is further provided with a plurality of branch pipes 7.2.1, see Figure 1 、 Figure 2 、 Figure 6 、 Figure 7 Each branch tube 7.2.1 is evenly distributed along the circumference of the ejector outlet 7.2, forming an umbrella-shaped branch tube structure. Fluid is ejected at high speed into the reaction device 8 through each branch tube 7.2.1. The high-speed gas-liquid mixture within the ejector body 7.4 is ultimately dispersed through the umbrella-shaped branches at the ejector outlet 7.2 into the reaction device 8 for contact reaction with the wastewater. The umbrella-shaped branch tube design increases the range of jet disturbance, resulting in more uniform distribution of ozone. The number of branch tubes 7.2.1 is at least two, and may be three, four, five, six, seven, eight, or more. This number is not intended to limit the scope of protection of the present invention and may be set according to actual needs.

[0050] In this embodiment, the reaction device 8 is an ozone reactor, and ozone is transported to the ozone reactor through the negative pressure ejector 7 to react with the wastewater. The reaction device 8 is also connected to a tail gas destruction device 11, such as a tail gas destroyer, Figure 1 As shown, the residual ozone will pass through the collection device located at the top of the reaction device 8 and then enter the tail gas destroyer for treatment to avoid secondary pollution caused by ozone escape.

[0051] The wastewater treatment process of this embodiment is as follows:

[0052] Blower 1 provides pressurized air, which passes through Class C filter 2.1 to remove large solid particles and de-oil the air before entering cooling unit 3. After cooling and drying, the air passes through Class A filter 2.2 to remove small solid particles and render the air completely oil-free. It then enters drying unit 4, where the adsorption of a desiccant further reduces the humidity. Finally, it passes through a set of Class T filters 2.3 and enters ozone generator 5. Ozone generator 5 uses air as feedstock to produce a gas mixture containing a certain concentration of ozone. The ozone generator's outlet is connected to a buffer device 6, the outlet of which is connected to a gas inlet 9.1 on an intake pipe 7.3. The ozone-containing gas mixture is drawn in through the negative pressure generated by the high-speed jets within negative pressure ejector 7. Under the action of negative pressure ejector 7, it mixes with pressurized liquid provided by circulation unit 10, forming a high-speed gas-liquid mixed jet. The mixture is then dispersed through umbrella-shaped branches 7.2.1 at the bottom of the negative pressure ejector into reaction unit 8 for a contact reaction with wastewater.

[0053] The impact of the high-speed mixed jet provided by the negative pressure ejector 7 significantly disturbs the wastewater, increasing the ozone diffusion and mass transfer rate while accelerating the ozone contact reaction. The design of the umbrella-shaped branch pipe 7.2.1 increases the range of the jet disturbance, making the ozone distribution more uniform. Finally, the excess ozone components that escape are collected and decomposed by the exhaust gas destruction device 11. The air inlet pipe 7.3 of the negative pressure ejector 7 is equipped with a backflow prevention device 9 with a flow barrier 9.3, which effectively prevents wastewater from backflowing through the air inlet pipe 7.3 into the ozone generator 5 when aeration is stopped.

[0054] The ozone generating system of this embodiment adopts a blower to provide an air source for the ozone generator, and utilizes a negative pressure ejector 7 as an ozone aeration device. Compared with the currently adopted air compressor air supply + aeration disk aeration method, the energy consumption of the air source preparation system can be reduced. At the same time, jet aeration can greatly improve the ozone mass transfer efficiency and prevent the wastewater of the reaction device 8 from flowing back into the ozone generating device through the aeration pipe.

[0055] Example 2

[0056] When wastewater treatment is performed using the wastewater treatment system of Example 1, the utilization rate of ozone can reach 97-99%. Compared with the traditional bottom aeration plate bubbling process, the mixing effect of ozone and wastewater can be significantly enhanced.

[0057] Using a conventional bottom aeration disc bubbling process for wastewater treatment requires a 1kg / h ozone generator. The wastewater treatment system of Example 1 only requires a single 600g / h ozone generator, reducing the installed power of the equipment by approximately 6kW. The additional circulating pump (circulator 10) for jet aeration requires only 3.7kW of power. Therefore, the use of an air compressor and jet aeration reduces system energy consumption. Furthermore, the high ozone utilization rate significantly reduces the workload of the tail gas destruction device 11 and the environmental pollution caused by ozone leakage.

[0058] The above disclosure is merely a preferred embodiment of the present invention. The preferred embodiment does not exhaustively describe all details, nor does it limit the invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A wastewater treatment system, characterized in that: The ozone generating system includes an air source, which provides positive pressure air. The air is filtered and dried before being used to generate ozone by an ozone generating device. The ozone generated is mixed with a high-speed fluid in a negative pressure ejector and enters a reaction device from the ejector outlet to react with wastewater. The negative pressure ejector includes an ejector inlet end, an ejector outlet end, and an air inlet pipe. The outlet end of the ozone generator is connected to the air inlet pipe. The outlet end of the negative pressure ejector is arranged in the reaction device. The air inlet pipe is arranged at a predetermined position near the ejector inlet end. The air inlet pipe is also provided with an anti-backflow device. The ozone generating system further comprises a buffer device for preventing liquid backflow, wherein the buffer device is arranged between the ozone generating device and the negative pressure ejector; The backflow prevention device includes a gas inlet, an air inlet chamber and a flow baffle, wherein the air inlet chamber is fixed to the air inlet pipe, the flow baffle is arranged in the air inlet chamber, and the gas inlet is connected to the outlet end of the ozone generator. When the air inlet pipe is in the suction state, the gas enters the air inlet chamber from the gas inlet, passes through the flow baffle and the air inlet pipe, and enters the negative pressure ejector; The baffle includes a closed end, an open end and a connecting portion. The baffle is fixed to the intake pipe through the connecting portion. The closed end is located above the intake pipe. The structure of the connecting portion forms a plurality of holes between the baffle and the intake pipe that allow fluid to pass through.

2. The wastewater treatment system according to claim 1, characterized in that The air source is a blower, which provides positive pressure air to the ozone generating system.

3. The wastewater treatment system according to claim 1, characterized in that A cooling device, a drying device and an ozone generator are sequentially provided at the rear end of the air source, and at least one filtering device is respectively provided at the front end of the cooling device, the drying device and the ozone generator.

4. The wastewater treatment system according to claim 3, characterized in that: The cooling device is a cold dryer, the drying device is an adsorption dryer, the ozone generating device is an ozone generator, and the filtering device is a filter.

5. The wastewater treatment system according to claim 1, characterized in that: It also includes a circulation device. When the circulation device is in operation, the fluid in the reaction device is transported from the ejector inlet end to the negative pressure ejector, and is ejected at high speed from the ejector outlet end, so that the air inlet pipe generates negative pressure to absorb ozone.

6. The wastewater treatment system according to claim 1, characterized in that: The outlet end of the negative pressure ejector is further provided with a plurality of branch pipes, each of the branch pipes being evenly distributed along the circumference of the outlet end; the gas-liquid mixture in the negative pressure ejector is ejected from the branch pipes into the reaction device.

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