A mobile device and method for pre-treatment of high-difficulty wastewater

Abstract

The present invention relates to a mobile device and method for pretreating highly difficult wastewater, comprising: a flocculation and aeration unit comprising a first tank body, the exterior of which is equipped with a first micro-nano injector; an ozone aeration unit comprising a second tank body, the exterior of which is equipped with a second micro-nano injector; an ozone generating unit for generating ozone and supplying the ozone to the second micro-nano injector; a control unit electrically connected to the flocculation and aeration unit, the ozone aeration unit, and the ozone generating unit; and a mobile unit for carrying the flocculation and aeration unit, the ozone aeration unit, the ozone generating unit, and the control unit. Pretreating highly difficult wastewater through flocculation and aeration can effectively reduce the concentration of pollutants in the wastewater, improve its biodegradability, and create favorable conditions for subsequent biological, chemical, or physical treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of high-difficulty wastewater treatment, and in particular to a mobile device and method for pre-treating high-difficulty wastewater. Background Art

[0002] High-difficulty industrial wastewater, a key target for environmental pollution control, has attracted considerable attention due to its complexity and difficulty to treat. This type of wastewater contains high concentrations of organic matter, heavy metals, toxic substances, or persistently degradable substances. Common examples include electroplating wastewater, petrochemical wastewater, pharmaceutical wastewater, printing and dyeing wastewater, spray wastewater, cutting wastewater, and grinding wastewater. These wastewaters contain significant amounts of petroleum, organic matter, heavy metal ions, toxic substances, and persistently degradable substances. These wastewaters are typically highly concentrated, difficult to degrade, highly toxic, and have poor biodegradability (B / C ≤ 0.3). The treatment challenges are further exacerbated for small, dispersed volumes of wastewater from specialized industries. Limited treatment space and dispersed pollution sources pose significant challenges to wastewater collection, transportation, and treatment. Due to the lack or inadequacy of wastewater treatment facilities, these wastewaters are often discharged without effective treatment, causing serious environmental pollution. Therefore, how to develop a mobile device for the pretreatment of highly difficult wastewater, which can quickly and effectively reduce the concentration of pollutants in scattered and small amounts of special industry wastewater and provide strong support for subsequent standard treatment, is an urgent problem that needs to be solved. Summary of the Invention

[0003] In response to the technical problems existing in the prior art, the first purpose of the present invention is to provide a mobile device for pretreatment of difficult wastewater, including a flocculation aeration unit, an ozone aeration unit, an ozone generating unit, a control unit and a mobile unit. By pretreating difficult wastewater through flocculation aeration and ozone aeration, the concentration of pollutants in the wastewater can be effectively reduced, the biodegradability of the wastewater can be improved, and favorable conditions can be created for subsequent biological treatment, chemical treatment or physical treatment.

[0004] The second purpose of the present invention is to provide a method for pre-treating difficult wastewater using a mobile device. This method can quickly and effectively reduce the concentration of pollutants in the wastewater and adapt to the wastewater treatment needs of different locations and scales.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A mobile device for pre-treating high-difficulty wastewater, the mobile device comprising: a flocculation aeration unit, the flocculation aeration unit comprising a first tank body, the first tank body comprising a high-difficulty wastewater inlet, a reagent inlet and a gas outlet formed on the top, an overflow port and a first jet inlet formed on the side wall, and a mud discharge port formed on the bottom, a first micro-nano ejector is arranged on the outside of the first tank body, and the output end of the first micro-nano ejector is connected to the first jet inlet; an ozone aeration unit, the ozone aeration unit comprising a second tank body, the second tank body comprising an ozone outlet formed on the top, a liquid inlet and a second jet inlet formed on the side wall, and an overflow port and a first jet inlet formed on the side wall. A liquid discharge port at the bottom, the liquid inlet is connected to the overflow port, a second micro-nano ejector is arranged on the outside of the second tank body, and the output end of the second micro-nano ejector is connected to the second ejection inlet; an ozone generating unit, the ozone generating unit is used to generate ozone to supply the ozone to the second micro-nano ejector; a control unit, the control unit is electrically connected to the flocculation aeration unit, the ozone aeration unit and the ozone generating unit respectively; a mobile unit, the mobile unit is used to load the flocculation aeration unit, the ozone aeration unit, the ozone generating unit and the control unit, so that they can be moved to the vicinity of the high-difficulty wastewater to be treated.

[0007] Furthermore, the first micro-nano ejector includes a first venturi jet tube and a first delivery pump arranged in series, the first venturi jet tube includes an air inlet formed at the top, and a first gas-liquid mixture output port formed at the side, the first gas-liquid mixture output port is connected to the first jet inlet, and the first delivery pump has a first input port for receiving the high-difficulty wastewater to be treated.

[0008] Furthermore, a guide tube is vertically arranged inside the first tank body, and the upper and lower ends of the guide tube are open. The high-difficulty wastewater inlet and the chemical inlet are respectively extended to the interior of the guide tube through pipelines, and the first jet inlet is extended to the interior of the guide tube through pipelines. The space enclosed inside the guide tube forms a gas-liquid countercurrent coupling reaction zone, wherein the inner wall of the guide tube is provided with a plurality of porous arc-shaped reflection plates at certain intervals along its length direction, and the porous arc-shaped reflection plates are bent and extended upward from the inner wall of the guide tube.

[0009] Furthermore, the second micro-nano ejector includes a second venturi jet tube and a second delivery pump arranged in series, the second venturi jet tube includes an ozone input port formed at the top, and a second gas-liquid mixture output port formed at the side, the second gas-liquid mixture output port is connected to the second jet inlet, and the second delivery pump has a second input port for receiving wastewater from the second tank body.

[0010] Furthermore, the second micro-nano fluidic device also includes a liquid extraction pipe fitting, which includes a tube body and a liquid extraction cylinder arranged in series, one end of the tube body is connected to the second input port, and the other end of the tube body extends toward the interior of the second tank body, so that the liquid extraction cylinder is located in the second tank body, and the outer wall of the liquid extraction cylinder is circumferentially provided with multiple through holes for extracting wastewater.

[0011] Furthermore, the second tank body also includes an aeration assembly, the aeration assembly includes an aeration body, the aeration body includes an aeration inlet formed at the bottom, the aeration inlet is connected to the second jet inlet through a pipeline, and a plurality of nozzles are circumferentially arranged at the lower part of the aeration body, and the nozzles extend obliquely toward the lower part of the second tank body.

[0012] Furthermore, the ozone generating unit includes an ozone generator, the ozone generator includes an ozone output port formed on the top, and the ozone output port is communicated with the ozone input port.

[0013] Furthermore, the mobile unit includes a mobile platform, a plurality of wheels and a fixing mechanism are provided at the lower portion of the mobile platform, and the flocculation aeration unit, the ozone aeration unit, the ozone generating unit and the control unit are all located on the mobile platform.

[0014] Furthermore, a support frame is provided on the mobile platform, which includes a flat plate and a plurality of support legs arranged at the bottom of the flat plate, and the support legs make the flat plate a certain distance away from the mobile platform. The first micro-nano injector and the second micro-nano injector are both located on the flat plate. A sludge storage box and a pretreated wastewater storage box are also provided between the flat plate and the mobile platform. The mud inlet of the sludge storage box is connected to the mud discharge port of the first tank body, and the inlet of the pretreated wastewater storage box is connected to the liquid discharge port of the second tank body.

[0015] A method for pre-treating difficult-to-treat wastewater using the mobile device described above, the method comprising: moving the mobile device to the vicinity of the difficult-to-treat wastewater to be treated; adding difficult-to-treat wastewater into the first tank through the wastewater inlet, and adding flocculant through the reagent inlet; starting the first micro-nano ejector to mix external gas with the difficult-to-treat wastewater to form a jet gas-liquid mixed fluid, and spraying the jet gas-liquid mixed fluid into the first tank through the first jet inlet for flocculation and aeration; the wastewater after flocculation and aeration flows into the second tank through the overflow port; starting the ozone generating unit and the second micro-nano ejector to mix ozone with the wastewater in the second tank to form a jet gas-liquid mixed fluid, and spraying the jet gas-liquid mixed fluid into the second tank through the second jet inlet for ozone aeration; the pretreated wastewater is discharged from the drain port of the second tank.

[0016] The present invention has the following advantages:

[0017] 1. The mobile device for pre-treating difficult wastewater of the present invention includes a flocculation and aeration unit, an ozone aeration unit, an ozone generating unit, a control unit, and a mobile unit. By pre-treating difficult wastewater through flocculation and aeration and ozone aeration, the concentration of pollutants in the wastewater can be effectively reduced, the biodegradability of the wastewater can be improved, and favorable conditions can be created for subsequent biological, chemical, or physical treatment. The mobile unit can be used to move the device to the vicinity of the difficult wastewater to be treated. It is suitable for scattered, small-volume, and small-footprint wastewater from special industries. It can achieve on-site treatment of wastewater, avoid the risk of contamination during wastewater transportation, and improve the efficiency and safety of wastewater treatment.

[0018] 2. The mobile device of this invention utilizes a conical nozzle design based on the Venturi principle, using first and second micro-nano ejectors to achieve efficient aeration and push flow integration. Furthermore, without the need for an additional fan, the pressure differential generated by the delivery pump alone creates a negative pressure zone (below -0.085 MPa) within the nozzle, naturally drawing in large quantities of air or ozone and dividing it into tiny bubbles or ozone bubbles (approximately 100nm to 200nm in diameter). This increases the gas-liquid contact area, promotes rapid dissolution of oxygen or ozone, and efficiently utilizes them (utilization rate exceeding 45%). These micro-nano bubbles not only enhance the redox reaction in the wastewater but also significantly improve mixing efficiency, ensuring the full oxidation and decomposition of pollutants in the wastewater, further enhancing the pretreatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the mobile device for pre-treatment of highly difficult wastewater according to the present invention.

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the mobile device for pre-treatment of highly difficult wastewater from another angle of the present invention.

[0021] Figure 3 It is a schematic diagram of the three-dimensional structure of the flocculation aeration unit and the ozone aeration unit of the present invention.

[0022] Figure 4 It is a three-dimensional cross-sectional view of the flocculation aeration unit of the present invention.

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the first micro-nano fluidic device of the present invention.

[0024] Figure 6 It is a schematic diagram of the three-dimensional structure of the ozone aeration unit of the present invention.

[0025] Figure 7 It is a schematic diagram of the three-dimensional structure of the second micro-nano fluidic device of the present invention.

[0026] Figure 8 It is a schematic diagram of the three-dimensional structure of the mobile unit of the present invention.

[0027] Among them, 1 is a flocculation aeration unit, 101 is the first tank, 101a is the high-difficulty wastewater inlet, 101b is the reagent inlet, 101c is the overflow port, 101d is the first jet inlet, 101e is the mud discharge port, 101f is the gas outlet, 102 is the first micro-nano ejector, 102a is the first Venturi jet tube, 102a1 is the air inlet, 102a2 is the first gas-liquid mixture outlet, 102a3 is the extension pipe, 102a 4 is a support rod, 102a5 is a protective cover, 102b is a first delivery pump, 102b1 is a first input port, 103 is a guide tube, 103a is a porous arc-shaped reflector plate, 103b is a gas-liquid countercurrent coupling reaction zone, 103c is a reinforcing rib, 2 is an ozone aeration unit, 201 is a second tank body, 201a is a liquid inlet, 201b is a second jet inlet, 201c is a liquid discharge port, 201d is an ozone outlet, 202 is a second micro-nano jet device, 202a is the second venturi jet tube, 202a1 is the ozone input port, 202a2 is the second gas-liquid mixture output port, 202b is the second delivery pump, 202b1 is the second input port, 202c is the liquid extraction pipe, 202c1 is the pipe body, 202c2 is the liquid extraction cylinder, 202c3 is the through hole, 203 is the aeration component, 203a is the aeration body, 203b is the nozzle, 203c is the aeration inlet, 3 is the ozone generating unit, 301 is the ozone generator, 301a is the ozone output port, 4 is the control unit, 5 is the mobile unit, 501 is the mobile platform, 501a is the wheel, 501b is the fixing mechanism, 501c is the support frame, 501c1 is the flat plate, 501c2 is the support foot, 501d is the sludge storage box, 501d1 is the sludge inlet, 501d2 is the sludge outlet, 501e is the pretreated wastewater storage box, 501e1 is the inlet, and 501e2 is the outlet. DETAILED DESCRIPTION

[0028] The following description is essentially only exemplary and is not intended to limit the present invention, its application, or use. It will be further understood that the terms "comprise" and / or "comprising" specify the existence of the features, wholes, steps, operations, elements and / or parts described when used in this specification, but do not exclude the existence of one or more other features, wholes, steps, operations, elements, parts and / or their groups or add one or more other features, wholes, steps, operations, elements, parts and / or their groups. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. It will be understood that when an element, component and / or part is referred to as "connected to another element, component and / or part", it can be directly connected to another element, component and / or part, or there can be an intermediate element. It will be understood that although the terms "first", "second" and the like can be used to describe various elements, components and / or parts in this article, these elements, components and / or parts should not be limited by these terms. These terms are only used to distinguish an element, component or part from another element, component or part. Therefore, the first element, component or part discussed below can be referred to as the second element, component or part without departing from the teachings of the present invention. Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as those commonly understood by those of ordinary skill in the art to which the present invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the relevant field and / or the context of this specification, and will not be interpreted in an idealized or overly formal sense unless explicitly defined as such herein.

[0029] It should be understood that, in order to clearly show the contents therein, the drawings herein are not drawn to scale, and the same or similar reference numerals indicate the same or similar components or parts. In addition, it should be understood that any embodiments described in this application and the technical features included therein can be combined with each other.

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] like Figure 1 and Figure 2 As shown, a mobile device for pretreatment of difficult wastewater includes a flocculation aeration unit 1, an ozone aeration unit 2, an ozone generating unit 3, a control unit 4 and a mobile unit 5. The flocculation aeration unit 1, the ozone aeration unit 2, the ozone generating unit 3 and the control unit 4 are all integrated on the mobile unit 5, which facilitates the movement of the pretreatment facilities to the vicinity of the difficult wastewater treatment point.

[0032] like Figure 1-3As shown, the flocculation and aeration unit 1 includes a first tank body 101, which includes a high-difficulty wastewater inlet 101a, a chemical inlet 101b and a gas outlet 101f formed at the top. The high-difficulty wastewater inlet 101a is used for high-difficulty wastewater from an external treatment point, and a delivery pump can be configured on the external pipeline, while the chemical inlet 101b is used for adding flocculants, and the flocculants are PAM or PAC. A flocculation and stirring device (not shown in the figure) can be configured on the mobile unit 5. The device can fully stir and prepare the flocculants in advance, and then pump the flocculants into the first tank body 101 through the pipeline. Of course, the high-difficulty wastewater inlet 101a and the chemical inlet 101b can be provided with only one feed port, and a pipeline mixer is provided at the feed port. The high-difficulty wastewater and the flocculant are pre-mixed in the pipeline mixer and then transported to the first tank body 101. An overflow port 101c and a first jet inlet 101d are formed on the sidewall of the first tank 101. The overflow port 101c is located above the first jet inlet 101d and is used to smoothly discharge the supernatant after the flocculation and aeration process is completed. The first jet inlet 101d is located at the bottom of the first tank 101 and is used to receive the gas-liquid mixed fluid from the first micro-nano ejector 102, so that the wastewater is fully aerated within the first tank 101. The aerated gas is discharged from the gas outlet 101f to the external environment or exhaust gas treatment facilities. The first micro-nano ejector 102 is configured on the outside of the first tank 101, and the output end of the first micro-nano ejector 102 is connected to the first jet inlet 101d. The first micro-nano ejector 102 can mix the air source with the high-difficulty wastewater to form a gas-liquid mixed fluid, which is then ejected into the first tank 101 at a certain speed, thereby maximizing the deep aeration and flocculation effect of the wastewater. A mud discharge port 101e is formed at the bottom of the first tank body 101. The mud discharge port 101e is used to discharge the sludge after flocculation and sedimentation to other treatment facilities. The bottom of the first tank body 101 is also provided with a support. The support allows the bottom of the first tank body 101 to be a certain distance away from the mobile unit 5, so that there is a certain space between the mud discharge port 101e and the mobile unit 5 to smoothly discharge the sludge.

[0033] Continue to refer to Figure 5The first micro-nano ejector 102 includes a first venturi ejector tube 102a and a first delivery pump 102b arranged in series. The first micro-nano ejector 102 is located on the upper part of the mobile unit 5. The first venturi ejector tube 102a includes an air inlet 102a1 formed on the upper part. The air inlet 102a1 is used to receive an air source so that the air source can smoothly enter the interior of the first venturi ejector tube 102a, providing a sufficient source of oxygen for the subsequent wastewater aeration process. And a first gas-liquid mixture output port 102a2 is formed on the side, the first gas-liquid mixture output port 102a2 is used to discharge the gas-liquid mixed fluid, the first gas-liquid mixture output port 102a2 is connected to the first jet inlet 101d, and the first delivery pump 102b has a first input port 102b1 for receiving high-difficulty wastewater to be treated. The first input port 102b1 can directly extract wastewater through a pipeline, and can also be connected to the first tank body 101 through a pipeline to extract wastewater in the first tank body 101 for treatment. Among them, an extension tube 102a3 is arranged at the air inlet 102a1, the top of the extension tube 102a3 is open and a plurality of support rods 102a4 are arranged circumferentially, and the plurality of support rods 102a4 extend upward from the top of the extension tube 102a3 to a certain height, and one end of each of the plurality of support rods 102a4 is connected to a protective cover 102a5, which is used to prevent external impurities from entering the first venturi jet tube 102a. The air source enters the extension tube 102a3 through the gap formed by the plurality of support rods 102a4, and then enters the interior of the first venturi jet tube 102a through the air inlet 102a1, and is fully mixed and aerated with the wastewater.

[0034] Continue to refer to Figure 4A guide tube 103 is vertically arranged inside the first tank body 101. The length direction of the guide tube 103 is roughly parallel to the length direction of the first tank body 101. The guide tube 103 is fixedly connected to the inner wall of the first tank body 101 through a reinforcing rib 103c. The upper and lower ends of the guide tube 103 are open. The high-difficulty wastewater inlet 101a and the pharmaceutical inlet 101b are respectively extended to the inside of the guide tube 103 through pipelines. The high-difficulty wastewater inlet 101a and the pharmaceutical inlet 101b are respectively extended to the inside of the guide tube 103 through pipelines. The pipeline extends through the upper end of the guide tube 103 to the interior thereof, and the first jet inlet 101d extends to the interior of the guide tube 103 through the pipeline. The first jet inlet 101d extends to the interior of the guide tube 103 through the pipeline through the lower end of the guide tube 103, wherein the pipeline outlet end of the first jet inlet 101d can also be configured with a diffuser cover, and the output port of the diffuser cover faces the upper end of the guide tube 103 to increase the injection area of ​​the gas-liquid mixed fluid and further promote the full mixing of the wastewater and bubbles. The space enclosed inside the guide tube 103 forms a gas-liquid countercurrent coupling reaction zone 103b, and the pipeline output ports of the high-difficulty wastewater inlet 101a, the reagent inlet 101b and the first jet inlet 101d are all oriented toward the gas-liquid countercurrent coupling reaction zone 103b. Among them, the pipelines of the high-difficulty wastewater inlet 101a and the reagent inlet 101b output wastewater and flocculant downward, while the pipeline of the first jet inlet 101d sprays the gas-liquid mixed fluid upward, which promotes the countercurrent contact and mixing of the wastewater, flocculant and the gas-liquid mixed fluid, thereby improving the reaction efficiency. The inner wall of the guide tube 103 is provided with a plurality of porous curved reflective plates 103a at regular intervals along its length. The porous curved reflective plates 103a extend upward from the inner wall of the guide tube 103 and include long porous curved reflective plates and short porous curved reflective plates. The long and short porous curved reflective plates are arranged in an interlaced manner. This not only enhances the disturbance and mixing of the fluid but also effectively prevents sludge from back-mixing. In this embodiment, there are eight porous curved reflective plates 103a, symmetrically arranged on both sides of the inner wall of the guide tube 103. These porous curved reflective plates 103a include four long porous curved reflective plates and four short porous curved reflective plates, which are interlaced to form a flow disturbance and reflection system. Of course, the number of porous curved reflective plates 103a can be configured according to actual processing requirements, for example, six, ten, etc. The porous arc-shaped reflective plate 103a not only effectively prevents the back-mixing of sludge, but also prolongs the residence time of bubbles in wastewater, making the contact between bubbles and wastewater more complete, further improving the efficiency of wastewater treatment.

[0035] like Figure 1-3As shown, the ozone aeration unit 2 includes a second tank body 201, which includes an ozone outlet 201d formed on the top, a liquid inlet 201a and a second jet inlet 201b formed on the side wall, the liquid inlet 201a is connected to the overflow port 101c, and the height position of the liquid inlet 201a and the overflow port 101c is roughly the same. The liquid inlet 201a is used to receive the wastewater output from the overflow port 101c, and a drain port 201c is formed at the bottom. The drain port 201c is used to discharge the wastewater after ozone aeration. The bottom of the second tank body 201 is also provided with a support. The support makes the bottom of the first tank body 101 a certain distance away from the mobile unit 5, so that there is a certain space between the drain port 201c and the mobile unit 5 to smoothly discharge the pretreated wastewater. A second micro-nano ejector 202 is disposed on the outside of the second tank body 201, and the output end of the second micro-nano ejector 202 is connected to the second ejection inlet 201b. The second micro-nano ejector 202 can mix the odor source with the high-difficulty wastewater to form a gas-liquid mixed fluid, and spray it into the second tank body 201 at a certain speed, thereby realizing deep ozone aeration of the wastewater. The aerated ozone is discharged from the ozone outlet 201d to the external environment or exhaust gas treatment facility.

[0036] Continue to refer to Figure 7The second micro-nano ejector 202 includes a second venturi ejector tube 202a and a second delivery pump 202b arranged in series. The second venturi ejector tube 202a includes an ozone input port 202a1 formed at the top for receiving ozone generated by the ozone generating unit 3, and a second gas-liquid mixture output port 202a2 formed at the side. The second gas-liquid mixture output port 202a2 is connected to the second ejector inlet 201b. The second ejector inlet 201b extends through a pipeline to the middle of the second tank body 201, and its outlet end faces the top of the second tank body 201, allowing the gas-liquid mixed fluid to be ejected upward, while the wastewater introduced by the liquid inlet 201a flows downward. The wastewater flow and the gas-liquid mixed fluid can form sufficient convection and contact within the second tank body 201, thereby improving treatment efficiency. The second delivery pump 202b has a second input port 202b1 for receiving wastewater from the second tank body 201. The second micro-nano fluidic device 202 also includes a liquid extraction pipe 202c, which includes a tube body 202c1 and a liquid extraction cylinder 202c2 arranged in series. One end of the tube body 202c1 is connected to the second input port 202b1, and the other end of the tube body 202c1 extends toward the interior of the second tank body 201, so that the liquid extraction cylinder 202c2 is located in the second tank body 201. The outer wall of the liquid extraction cylinder 202c2 is circumferentially provided with multiple through holes 202c3 for extracting wastewater. After the wastewater in the second tank body 201 is extracted by the liquid extraction pipe 202c, it enters the second venturi jet tube 202a and mixes with ozone to form a gas-liquid mixed fluid. Subsequently, this mixed fluid is ejected into the second tank body 201 again, achieving an external circulation of the wastewater and enhancing the wastewater treatment effect.

[0037] Both the first Venturi jet tube 102a and the second Venturi jet tube 202a primarily consist of four sections: an inlet section, a contraction section, a throat, and a diffuser section. When wastewater enters the first or second Venturi jet tube 102a, 202a, from the inlet section, the flow rate begins to increase due to the gradual decrease in pipe diameter (the contraction section). According to Bernoulli's equation, an increase in flow rate is inevitably accompanied by a decrease in pressure. Therefore, in the contraction section, the wastewater's pressure gradually decreases while the flow rate gradually increases. When the wastewater flows through the throat, its flow rate reaches its maximum and its pressure drops to its minimum. At this point, due to the pressure difference between the throat and the external environment, external air or ozone is drawn into the first or second Venturi jet tube 102a, 202a, through the air inlet 102a1 or the ozone inlet 202a1. The air or ozone initially mixes with the wastewater in the throat, forming a gas-liquid mixture. The smaller diameter of the throat enhances the mixing of wastewater and air or ozone. After passing through the throat, the mixture enters the diffuser section, where the pipe diameter gradually increases, the wastewater flow rate decreases, and the pressure gradually recovers. The mixed fluid between the wastewater and air or ozone gradually stabilizes, forming a fine gas-liquid mixture. The kinetic energy of the wastewater is gradually converted into pressure energy, and the gas-liquid mixture becomes more uniform and stable. Finally, it is ejected from the first gas-liquid mixture outlet 102a2 or the second gas-liquid mixture outlet 202a2.

[0038] Continue to refer to Figure 6The second tank 201 also includes an aeration assembly 203. This assembly includes an aeration body 203a, a hollow structure that receives and distributes the gas-liquid mixture from the second micro-nano ejector 302. The aeration body 203a includes an aeration inlet 203c formed at the bottom, which is connected to the second ejector inlet 201b via a pipeline. Multiple nozzles 203b are circumferentially arranged around the lower portion of the aeration body 203a. These nozzles extend obliquely toward the lower portion of the second tank 201, allowing the fluid to be ejected onto the tank bottom, thereby enhancing the ozone aeration effect. The outlets of the nozzles 203b feature multi-hole nozzles, which enhance the dispersion and refinement of the gas-liquid mixture. These nozzles can subdivide the gas-liquid mixture into smaller droplets or bubbles, thereby increasing the contact area between the gas-liquid mixture and the wastewater in the second tank 201, accelerating chemical reactions or biodegradation processes and improving overall treatment efficiency. Ozone and wastewater are premixed by the second micro-nano injector 302 to form a gas-liquid mixture. This mixture is then introduced into the aeration body 203a via a pipeline. Within the aeration body 203a, the gas-liquid mixture is further distributed and directed to various nozzles 203b. These nozzles spray the gas-liquid mixture at high speeds and at an inclined angle into the lower area of ​​the second tank 201. The multi-porous nozzles ensure that the gas-liquid mixture is evenly dispersed in the form of droplets or bubbles, enhancing the mixing effect of the gas-liquid mixture and promoting the full reaction and treatment of the wastewater in the second tank 201. In an unillustrated embodiment, a rolling bearing is installed at the connection between the aeration inlet 203c and the pipeline, allowing the aeration body 203a to rotate relative to the pipeline. Multiple nozzles 203b are deflected horizontally at a predetermined angle. When multiple nozzles 203b simultaneously eject a gas-liquid mixture, this fluid not only impacts the wastewater at a constant velocity but also, through its momentum transfer effect, drives the aeration body 203a to rotate relative to the pipeline. This rotational motion creates a swirling aeration effect within the second tank 201. As the aeration body 203a rotates, the gas-liquid mixture is more evenly dispersed into the wastewater, forming a dynamic, three-dimensional mixing zone. This swirling flow promotes sufficient contact between suspended matter and dissolved oxygen in the wastewater, thereby improving the biodegradability of the wastewater.

[0039] like Figure 1 and Figure 2As shown, the ozone generating unit 3 is used to generate ozone to supply the ozone to the second micro-nano injector 202. The ozone generating unit 3 includes an ozone generator 301, which includes an ozone output port 301a formed on the top, and the ozone output port 301a is connected to the ozone input port 202a1. The ozone generator 301 mainly includes a power supply system, an ozone discharge chamber, and a cooling system. The power supply system is used to provide stable high-voltage direct current or alternating current to drive the corona discharge process in the ozone discharge chamber; the ozone discharge chamber includes multiple electrode plates. When high voltage electricity is applied to the electrode plates, the oxygen molecules in the discharge gap are ionized to form ozone. The cooling system is used to maintain the temperature of the ozone discharge chamber to prevent the equipment from overheating and damage. The operating principle of the ozone generator 301 is based on high-voltage discharge technology. Specifically, when a potential difference is formed between the high-voltage and low-voltage electrodes, oxygen molecules in the air are ionized, forming negatively charged oxygen ions. Driven by the electric field, these oxygen ions undergo high-frequency collisions with surrounding oxygen molecules, releasing a large amount of energy. During this process, some oxygen molecules are excited and decomposed into oxygen atoms. These oxygen atoms then combine with undecomposed oxygen molecules to form ozone molecules (O3). As ozone molecules continue to form and accumulate, they are discharged through the ozone outlet 301a at the top of the ozone generator 301 and transported to the second micro-nano injector 202. In the second micro-nano injector 202, ozone is thoroughly mixed and contacted with the wastewater. Utilizing ozone's strong oxidizing properties, it deeply oxidizes and decomposes organic matter, inorganic matter, and microorganisms in the wastewater, thereby purifying the wastewater.

[0040] like Figure 1 and Figure 2 As shown, the control unit 4 is electrically connected to the flocculation aeration unit 1, the ozone aeration unit 2, and the ozone generation unit 3, respectively, and the control unit 4 is located on the upper part of the mobile unit 5. In the flocculation aeration unit 1, the control unit 4 effectively removes suspended solids and colloidal substances in the wastewater by regulating the aeration volume and the dosage of the flocculant. In the ozone aeration unit 2, the control unit 4 adjusts the dosage of ozone and the aeration time to fully utilize the strong oxidizing properties of ozone to deeply oxidize and decompose organic matter, inorganic matter, and microorganisms in the wastewater. In the ozone generation unit 3, the control unit 4 ensures the stable generation and efficient transmission of ozone by monitoring its working status and ozone generation in real time.

[0041] like Figure 1 、 2As shown in Figures 8 and 9, the mobile unit 5 is used to carry the flocculation aeration unit 1, the ozone aeration unit 2, the ozone generation unit 3, and the control unit 4, so that they can be moved to the vicinity of the high-difficulty wastewater to be treated. The mobile unit 5 includes a mobile platform 501, which has a rectangular structure. One end of the mobile platform 501 has a trailer hook for docking with the front of the vehicle. The lower part of the mobile platform 501 is provided with multiple wheels 501a and a fixing mechanism 501b. The flocculation aeration unit 1, the ozone aeration unit 2, the ozone generation unit 3, and the control unit 4 are all located on the mobile platform 501. In this embodiment, there are four wheels 501a, which are fixed to the four corners of the bottom of the mobile platform 501. The fixing mechanism 501b includes four hydraulic structures, which are respectively located near the four wheels 501a. The hydraulic structure includes a hydraulic support rod and a driver. The hydraulic support rod is rotatably connected to the top of the mobile platform 501. The driver is located at the bottom of the mobile platform 501 and is used to drive the hydraulic support rod to rotate and extend. When the mobile platform 501 needs to be fixed, the operator only needs to control the rotation of the hydraulic support rod to extend and support it on the ground, and at the same time make the four wheels 501a leave the ground a certain distance, so as to achieve the fixation of the mobile platform 501 and avoid the treatment effect being affected by shaking or displacement during the operation. Among them, a support frame 501c is set on the mobile platform 501, and the support frame 501c includes a flat plate 501c1 and a plurality of support legs 501c2 set at the bottom of the flat plate 501c1. The support legs 501c2 make the flat plate 501c1 leave the mobile platform 501 a certain distance. The first micro-nano fluidizer 102 and the second micro-nano fluidizer 202 are both located on the flat plate 501c1, and the flocculation stirring device can also be set on the flat plate 501c1. The flat plate 501c1 and the mobile platform 50 1, a sludge storage tank 501d and a pre-treated wastewater storage tank 501e are also arranged between the first tank body 101 and the second tank body 201. The sludge inlet 501d1 of the sludge storage tank 501d is connected to the sludge outlet 101e of the first tank body 101. The side of the sludge storage tank 501d also has a sludge outlet 501d2. The inlet 501e1 of the pre-treated wastewater storage tank 501e is connected to the liquid outlet 201c of the second tank body 201. The pre-treated wastewater storage tank 501e also has an outlet 501e2 for connecting to subsequent treatment equipment. In an embodiment not shown, multiple side baffles are also arranged vertically on the mobile platform 501. The space enclosed by the side baffles is used to accommodate the flocculation aeration unit 1, the ozone aeration unit 2, the ozone generation unit 3, and the control unit 4, so that they are not affected by the external environment during movement. When treatment is required, the side baffles only need to be removed.

[0042] A method for pre-treating high-difficulty wastewater using the above-mentioned mobile device, the method comprising: moving the mobile device to the vicinity of the high-difficulty wastewater to be treated, specifically, moving the mobile device to the vicinity of the high-difficulty wastewater to be treated by means of the four wheels 501a at the bottom of the mobile platform 501, and then extending and supporting the mobile platform 501 on the ground by means of the four hydraulic support rods of the fixing mechanism 501b, thereby fixing the mobile platform 501. High-difficulty wastewater is added to the first tank body 101 through the wastewater inlet, and flocculant is added through the reagent inlet 101b. The first micro-nano ejector 102 is started to mix the external gas with the high-difficulty wastewater to form a jet gas-liquid mixed fluid, and the jet gas-liquid mixed fluid is sprayed into the first tank body 101 from the first jet inlet 101d for flocculation and aeration. The wastewater after flocculation and aeration flows into the second tank body 201 through the overflow port 101c. The ozone generator 3 is activated to produce high-concentration ozone gas. Simultaneously, the second micro-nano injector 202 is activated to mix the ozone with the wastewater in the second tank 201 to form a jet gas-liquid mixed fluid. This is then sprayed into the second tank 201 through the second jet inlet 201b for ozone aeration. The pretreated wastewater is discharged from the drain port 201c of the second tank 201.

[0043] In general, the mobile device for pre-treatment of difficult wastewater of the present invention includes a flocculation aeration unit, an ozone aeration unit, an ozone generating unit, a control unit and a mobile unit. By pre-treating difficult wastewater through flocculation aeration and ozone aeration, the concentration of pollutants in the wastewater can be effectively reduced, the biodegradability of the wastewater can be improved, and favorable conditions can be created for subsequent biological treatment, chemical treatment or physical treatment. The mobile unit can move the device to the vicinity of the difficult wastewater to be treated. It is suitable for scattered, small-volume, and small-footprint wastewater from special industries, and can achieve on-site treatment of wastewater, avoid the risk of pollution during wastewater transportation, and improve the efficiency and safety of wastewater treatment. The mobile device of the present invention realizes the integration of efficient aeration and flow propagation through the first micro-nano ejector and the second micro-nano ejector and the conical nozzle design based on the Venturi principle. Furthermore, no additional fan is required. The pressure differential generated solely by the delivery pump creates a negative pressure zone (below -0.085 MPa) within the nozzle, naturally drawing in large quantities of air or ozone and breaking them into tiny bubbles or ozone gas bubbles (approximately 100nm to 200nm in diameter). This increases the gas-liquid contact area, promoting the rapid dissolution and efficient utilization of oxygen or ozone (utilization rate exceeding 45%). These micro-nano-scale bubbles not only enhance the redox reaction in the wastewater but also significantly improve mixing efficiency, ensuring the full oxidation and decomposition of pollutants in the wastewater, further enhancing the pretreatment effect.

[0044] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A mobile device for pre-treatment of high-difficulty wastewater, characterized in that: The mobile device comprises: A flocculation and aeration unit comprising a first tank body, the first tank body comprising a high-difficulty wastewater inlet, a reagent inlet, and a gas outlet formed on the top, an overflow port and a first jet inlet formed on the side wall, and a mud discharge port formed on the bottom, a first micro-nano ejector disposed on the outside of the first tank body, and an output end of the first micro-nano ejector communicating with the first jet inlet; An ozone aeration unit, the ozone aeration unit comprising a second tank body, the second tank body comprising an ozone outlet formed on the top, a liquid inlet and a second jet inlet formed on the side wall, and a liquid discharge port formed on the bottom, the liquid inlet being in communication with the overflow port, a second micro-nano ejector being disposed on the outside of the second tank body, and an output end of the second micro-nano ejector being in communication with the second jet inlet; an ozone generating unit, the ozone generating unit being configured to generate ozone to supply the ozone to the second micro-nano injector; a control unit, the control unit being electrically connected to the flocculation aeration unit, the ozone aeration unit, and the ozone generating unit respectively; A mobile unit is used to load the flocculation aeration unit, the ozone aeration unit, the ozone generating unit and the control unit so that they can be moved to the vicinity of the high-difficulty wastewater to be treated.

2. The mobile device for pre-treatment of high-difficulty wastewater according to claim 1, characterized in that: The first micro-nano ejector includes a first venturi jet tube and a first delivery pump arranged in series, the first venturi jet tube includes an air inlet formed at the top, and a first gas-liquid mixture output port formed at the side, the first gas-liquid mixture output port is connected to the first jet inlet, and the first delivery pump has a first input port for receiving the high-difficulty wastewater to be treated.

3. The mobile device for pre-treatment of high-difficulty wastewater according to claim 1, characterized in that: A guide tube is vertically arranged inside the first tank body, and the upper and lower ends of the guide tube are open. The high-difficulty wastewater inlet and the chemical inlet are respectively extended to the interior of the guide tube through pipelines, and the first jet inlet is extended to the interior of the guide tube through pipelines. The space enclosed inside the guide tube forms a gas-liquid countercurrent coupling reaction zone, wherein the inner wall of the guide tube is provided with a plurality of porous arc-shaped reflection plates at certain intervals along its length direction, and the porous arc-shaped reflection plates are bent and extended upward from the inner wall of the guide tube.

4. The mobile device for pre-treatment of high-difficulty wastewater according to claim 1, characterized in that: The second micro-nano ejector includes a second venturi jet tube and a second delivery pump arranged in series, the second venturi jet tube includes an ozone input port formed at the top, and a second gas-liquid mixture output port formed at the side, the second gas-liquid mixture output port is connected to the second jet inlet, and the second delivery pump has a second input port for receiving wastewater from the second tank body.

5. The mobile device for pre-treatment of high-difficulty wastewater according to claim 4, characterized in that: The second micro-nano fluidic device also includes a liquid extraction pipe fitting, which includes a tube body and a liquid extraction cylinder arranged in series. One end of the tube body is connected to the second input port, and the other end of the tube body extends toward the interior of the second tank body, so that the liquid extraction cylinder is located in the second tank body. The outer wall of the liquid extraction cylinder is circumferentially provided with multiple through holes for extracting wastewater.

6. A mobile device for pre-treatment of highly difficult wastewater according to claim 1 or 4, characterized in that: The second tank body also includes an aeration assembly, which includes an aeration body. The aeration body includes an aeration inlet formed at the bottom, which is connected to the second jet inlet through a pipeline. A plurality of nozzles are circumferentially arranged at the lower part of the aeration body, and the nozzles extend obliquely toward the lower part of the second tank body.

7. The mobile device for pre-treatment of high-difficulty wastewater according to claim 4, characterized in that: The ozone generating unit includes an ozone generator. The ozone generator includes an ozone output port formed on the top, and the ozone output port is communicated with the ozone input port.

8. The mobile device for pre-treatment of high-difficulty wastewater according to claim 1, characterized in that: The mobile unit includes a mobile platform, a plurality of wheels and a fixing mechanism are provided at the lower portion of the mobile platform, and the flocculation aeration unit, the ozone aeration unit, the ozone generating unit and the control unit are all located on the mobile platform.

9. The mobile device for pre-treatment of high-difficulty wastewater according to claim 8, characterized in that: A support frame is provided on the mobile platform, which includes a flat plate and a plurality of support legs provided at the bottom of the flat plate. The support legs enable the flat plate to be a certain distance away from the mobile platform. The first micro-nano injector and the second micro-nano injector are both located on the flat plate. A sludge storage box and a pretreated wastewater storage box are also provided between the flat plate and the mobile platform. The mud inlet of the sludge storage box is connected to the mud discharge port of the first tank body, and the inlet of the pretreated wastewater storage box is connected to the liquid discharge port of the second tank body.

10. A method for pre-treating high-difficulty wastewater using the mobile device according to any one of claims 1 to 9, characterized in that: The method comprises: Moving the mobile device to the vicinity of the high-difficulty wastewater to be treated; Adding high-difficulty wastewater into the first tank through the wastewater inlet, and adding flocculant through the chemical inlet; Starting the first micro-nano ejector to mix external gas with the high-difficulty wastewater to form a jet gas-liquid mixed fluid, and spraying the jet gas-liquid mixed fluid into the first tank through the first jet inlet to perform flocculation and aeration; The wastewater after flocculation and aeration flows into the second tank through the overflow port; Starting the ozone generating unit and the second micro-nano ejector to mix ozone with the wastewater in the second tank to form a jet gas-liquid mixed fluid, and spraying the jet gas-liquid mixed fluid into the second tank from the second jet inlet to perform ozone aeration; The pretreated wastewater is discharged from the drain port of the second tank body.

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