Mobile device and method for pretreatment of high-difficulty wastewater

Abstract

The invention relates to a mobile device and method for pretreatment of high-difficulty wastewater, and the mobile device comprises a flocculation aeration unit which comprises a first tank body, and the exterior of the first tank body is provided with a first micro-nano jet device; the ozone aeration unit comprises a second tank body, and a second micro-nano jet device is arranged outside the second tank body; the ozone generation unit is used for generating ozone so as to supply the ozone to the second micro-nano jet device; the control unit is electrically connected with the flocculation aeration unit, the ozone aeration unit and the ozone generation unit respectively; the moving unit is used for loading the flocculation aeration unit, the ozone aeration unit, the ozone generation unit and the control unit. The high-difficulty wastewater is pretreated through flocculation aeration and ozone aeration, so that the concentration of pollutants in the wastewater can be effectively reduced, the biodegradability of the wastewater is improved, and favorable conditions are created for subsequent biological treatment, chemical treatment 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 high-difficulty wastewater pretreatment. Background Art

[0002] As a key target of environmental pollution control, high-difficulty industrial wastewater has attracted much attention due to its complexity and difficulty in treatment. This type of wastewater contains high concentrations of organic matter, heavy metals, toxic substances or difficult-to-degrade substances. Common examples include electroplating wastewater, petrochemical wastewater, pharmaceutical wastewater, printing and dyeing wastewater, spraying wastewater, cutting waste liquid, grinding waste liquid, etc. These wastewaters contain a large amount of petroleum, organic matter, heavy metal ions, toxic substances and difficult-to-degrade substances. This type of wastewater usually has high concentration, is difficult to degrade, has high toxicity, and has poor biodegradability (B / C≤0.3). The difficulty of treating scattered and small amounts of special industry wastewater is further increased. The lack of space for these wastewater treatment locations and the scattered pollution sources pose great challenges to wastewater collection, transportation and treatment. Due to the lack or imperfection of wastewater treatment facilities, these wastewaters are often discharged directly without effective treatment, causing serious pollution to the environment. 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 view of 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 object of the present invention is to provide a method for pre-treating difficult wastewater using a mobile device, which 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 solution: A mobile device for pre-treatment of difficult wastewater, the mobile device comprising: a flocculation aeration unit, the flocculation aeration unit comprising a first tank body, the first tank body comprising a difficult 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 a liquid inlet and a second 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 injector is arranged on the outside of the second tank body, and the output end of the second micro-nano injector is connected to the second injector inlet; an ozone generating unit, the ozone generating unit is used to generate ozone to supply the ozone to the second micro-nano injector; 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.

[0006] Furthermore, the first micro-nano ejector includes a first venturi ejector tube and a first delivery pump arranged in series, the first venturi ejector tube includes an air inlet formed at the top, and a first gas-liquid mixture outlet formed at the side, the first gas-liquid mixture outlet 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.

[0007] 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 reagent inlet are respectively extended to the inside of the guide tube through pipelines, and the first jet inlet is extended to the inside of the guide tube through a pipeline. 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.

[0008] Furthermore, the second micro-nano ejector includes a second venturi ejector tube and a second delivery pump arranged in series, the second venturi ejector 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 ejector inlet, and the second delivery pump has a second input port for receiving wastewater from the second tank body.

[0009] Furthermore, the second micro-nano injector 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.

[0010] 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.

[0011] Furthermore, the ozone generating unit includes an ozone generator, the ozone generator includes an ozone output port formed at the top, and the ozone output port is communicated with the ozone input port.

[0012] Furthermore, the mobile unit includes a mobile platform, a plurality of wheels and a fixing mechanism are provided at the lower part 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.

[0013] Furthermore, a support frame is provided on the mobile platform, and the support frame 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 leave the mobile platform by a certain distance, and the first micro-nano injector and the second micro-nano injector are both located on the flat plate, and a sludge storage box and a pretreated wastewater storage box are also arranged between the flat plate and the mobile platform, and 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.

[0014] A method for pretreating difficult-to-treat wastewater using the mobile device, 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 it into the first tank from 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 it into the second tank from the second jet inlet for ozone aeration; the pretreated wastewater is discharged from the drain port of the second tank.

[0015] The present invention has the following advantages: 1. The mobile device for pre-treatment of high-difficulty wastewater of the present invention comprises a flocculation aeration unit, an ozone aeration unit, an ozone generating unit, a control unit and a mobile unit. By pre-treating high-difficulty wastewater with 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 high-difficulty wastewater to be treated, which is suitable for scattered, small-volume, small-footprint special industry wastewater, 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.

[0016] 2. The mobile device of the present invention realizes the integration of efficient aeration and push flow through the first micro-nano ejector and the second micro-nano ejector and the conical nozzle design based on the Venturi principle. In addition, no additional fan is required. Only the pressure difference generated by the delivery pump forms a negative pressure zone (below -0.085Mpa) inside the nozzle, naturally inhaling a large amount of air or ozone, and cutting it into tiny bubbles or ozone bubbles (diameter of about 100nm to 200nm), increasing the gas-liquid contact area, and promoting the rapid dissolution and efficient utilization of oxygen or ozone (utilization rate of up to 45% or more). This micro-nano bubble not only strengthens the redox reaction of the wastewater, but also significantly improves the mixing efficiency, ensuring that the pollutants in the wastewater can be fully oxidized and decomposed, further improving the pretreatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] 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.

[0019] Figure 3 It is a three-dimensional structural schematic diagram of the flocculation aeration unit and the ozone aeration unit of the present invention.

[0020] Figure 4 It is a three-dimensional cross-sectional view of the flocculation aeration unit of the present invention.

[0021] Figure 5 It is a schematic diagram of the three-dimensional structure of the first micro-nano injector of the present invention.

[0022] Figure 6 It is a schematic diagram of the three-dimensional structure of the ozone aeration unit of the present invention.

[0023] Figure 7 It is a schematic diagram of the three-dimensional structure of the second micro-nano injector of the present invention.

[0024] Figure 8 It is a schematic diagram of the three-dimensional structure of the mobile unit of the present invention.

[0025] Among them, 1 is a flocculation aeration unit, 101 is a first tank, 101a is a high-difficulty wastewater inlet, 101b is a reagent inlet, 101c is an overflow port, 101d is a first jet inlet, 101e is a mud discharge port, 101f is a gas outlet, 102 is a first micro-nano ejector, 102a is a first venturi jet tube, 102a1 is an air inlet, 102a2 is a first gas-liquid mixture outlet, 102a3 is an extension tube, 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 reflection 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 a second venturi jet tube, 202a1 is an ozone input port, 202a2 is a second gas-liquid mixture output port, 202b is a second delivery pump, 202b1 is a second input port, 202c is a liquid extraction pipe, 202c1 is a pipe body, 202c2 is a liquid extraction cylinder, 202c3 is a through hole, 203 is an aeration component, 203a is an aeration body, 203b is a nozzle, 203c is an aeration inlet, 3 is an ozone generating unit, 301 is an ozone generator, 301a is an ozone output port, 4 is a control unit, 5 is a mobile unit, 501 is a mobile platform, 501a is a wheel, 501b is a fixing mechanism, 501c is a supporting frame, 501c1 is a flat plate, 501c2 is a supporting foot, 501d is a sludge storage box, 501d1 is a sludge inlet, 501d2 is a sludge outlet, 501e is a pre-treated wastewater storage box, 501e1 is an inlet, and 501e2 is an outlet. DETAILED DESCRIPTION

[0026] 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 term "include" and / or "comprising" specifies the existence of the features, wholes, steps, operations, elements and / or parts described when used in this specification, but does not exclude the existence of one or more other features, wholes, steps, operations, elements, parts and / or its groups or add one or more other features, wholes, steps, operations, elements, parts and / or its groups. As used in this article, 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 teaching of the present invention. Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meanings as those commonly understood by those of ordinary skill in the field 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 meanings consistent with their meanings in the relevant field and / or the context of this specification, and will not be interpreted in an idealized or overly formal sense, unless clearly defined in this article.

[0027] 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.

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0029] 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, so as to facilitate moving the pretreatment facilities to the vicinity of the difficult wastewater treatment point.

[0030] like Figure 1-3As shown, the flocculation aeration unit 1 includes a first tank body 101, and the first tank body 101 includes a high-difficulty wastewater inlet 101a, a chemical inlet 101b and a gas outlet 101f formed on 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, and the chemical inlet 101b is used for adding flocculants, and the flocculants are PAM or PAC. A flocculation stirring device (not shown in the figure) can be configured on the mobile unit 5, and 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 only be provided with one feed port, and a pipeline mixer is provided at the feed port, and the high-difficulty wastewater and the flocculant are pre-mixed in the pipeline mixer before being delivered to the first tank body 101. The overflow port 101c and the first jet inlet 101d are formed on the side wall of the first tank body 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 lower part of the first tank body 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 in the first tank body 101, and the aerated gas is discharged from the gas outlet 101f to the external environment or the tail gas treatment facility. The first micro-nano ejector 102 is configured outside the first tank body 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, and spray it into the first tank body 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, and is used to discharge the sludge after flocculation and sedimentation to other treatment facilities. A support is also configured at the bottom of the first tank body 101, and the support makes the bottom of the first tank body 101 away from the mobile unit 5 by a certain distance, so that there is a certain space between the mud discharge port 101e and the mobile unit 5, so as to discharge the sludge smoothly.

[0031] 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 first venturi ejector tube 102a to provide a sufficient oxygen source 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, 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 pipe 102a3 is arranged at the air inlet 102a1, the top of the extension pipe 102a3 is open and a plurality of support rods 102a4 are arranged circumferentially, the plurality of support rods 102a4 extend upward from the top of the extension pipe 102a3 to a certain height, and a protective cover 102a5 is connected at one end of each of the plurality of support rods 102a4, the protective cover 102a5 is used to prevent external impurities from entering the first venturi jet tube 102a, the air source enters the extension pipe 102a3 through the gap formed by the plurality of support rods 102a4, and then enters the first venturi jet tube 102a through the air inlet 102a1, and is fully mixed and aerated with the wastewater.

[0032] 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 extend to the inside of the guide tube 103 through pipelines respectively. The high-difficulty wastewater inlet 101a and the pharmaceutical inlet 101b are connected through The pipeline extends through the upper end of the guide tube 103 to the interior thereof, the first jet inlet 101d extends to the interior of the guide tube 103 through the pipeline, and 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 the 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, wherein 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. Among them, the inner wall of the guide tube 103 is provided with a plurality of porous arc-shaped reflective plates 103a at certain intervals along its length direction, and the porous arc-shaped reflective plates 103a are bent and extended upward from the inner wall of the guide tube 103, and the porous arc-shaped reflective plates 103a include porous arc-shaped reflective long plates and porous arc-shaped reflective short plates, and the porous arc-shaped reflective long plates and the porous arc-shaped reflective short plates are arranged in an interlaced manner, which not only enhances the disturbance and mixing effect of the fluid, but also effectively prevents the back-mixing phenomenon of the sludge. In this embodiment, the number of the porous arc-shaped reflective plates 103a is eight, which are symmetrically arranged on the inner walls of both sides of the guide tube 103, respectively, and these porous arc-shaped reflective plates 103a include four porous arc-shaped reflective long plates and four porous arc-shaped reflective short plates, which are arranged in an interlaced manner to form a disturbance and reflection system. Of course, the number of the porous arc-shaped reflective plates 103a can be configured according to actual processing requirements, such as 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 air bubbles in wastewater, making the contact between air bubbles and wastewater more complete, further improving the efficiency of wastewater treatment.

[0033] like Figure 1-3As shown, the ozone aeration unit 2 includes a second tank body 201, and the second tank body 201 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 substantially 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, and 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, and the support makes the bottom of the first tank body 101 away from the mobile unit 5 by a certain distance, so that there is a certain space between the drain port 201c and the mobile unit 5, so as to smoothly discharge the pre-treated wastewater. A second micro-nano ejector 202 is disposed outside the second tank body 201, and the output end of the second micro-nano ejector 202 is connected to the second ejector 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 the exhaust gas treatment facility.

[0034] 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, the ozone input port 202a1 is used to receive 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 to the middle of the second tank body 201 through a pipeline and its outlet end faces the top of the second tank body 201, so that the gas-liquid mixed fluid can be ejected upward, and the wastewater introduced by the liquid inlet 201a flows downward, and the wastewater flow and the gas-liquid mixed fluid can form sufficient convection and contact in the second tank body 201, thereby improving the 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 ejector 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 inside of the second tank body 201, so that the liquid extraction cylinder 202c2 is located in the second tank body 201, and the outer wall of the liquid extraction cylinder 202c2 is circumferentially provided with a plurality of through holes 202c3 for extracting wastewater. After the wastewater in the second tank body 201 is extracted through 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, realizing the external circulation of the wastewater and enhancing the wastewater treatment effect.

[0035] Among them, the first venturi jet tube 102a and the second venturi jet tube 202a are mainly composed of four parts: an inlet section, a contraction section, a throat and a diffusion section. When the wastewater enters the first venturi jet tube 102a or the second venturi jet tube 202a from the inlet section, the flow rate of the wastewater begins to gradually increase due to the gradual decrease in the pipe diameter (contraction section). According to the Bernoulli equation, the increase in flow rate is inevitably accompanied by a decrease in pressure. Therefore, in the contraction section, the pressure of the wastewater gradually decreases and the flow rate gradually increases. When the wastewater flows through the throat, its flow rate reaches the maximum value and the pressure drops to the lowest point. At this time, due to the pressure difference between the throat and the external environment, the external air or ozone is sucked into the first venturi jet tube 102a or the second venturi jet tube 202a through the air inlet 102a1 or the ozone input port 202a1. The air or ozone is preliminarily mixed with the wastewater in the throat to form a gas-liquid mixture. Since the diameter of the throat is small, the mixing effect of wastewater and air or ozone is enhanced. After passing through the throat, the mixture of wastewater and air or ozone enters the diffusion section, where the pipe diameter gradually increases, the flow rate of wastewater gradually decreases, and the pressure gradually recovers. The mixed fluid between wastewater and air or ozone gradually stabilizes to form a fine gas-liquid mixed fluid, the kinetic energy of the wastewater is gradually converted into pressure energy, and the gas-liquid mixture is more uniform and stable, and finally, it is ejected from the first gas-liquid mixture output port 102a2 or the second gas-liquid mixture output port 202a2.

[0036] Continue to refer to Figure 6The second tank body 201 also includes an aeration assembly 203, which includes an aeration body 203a. The aeration body 203a is a hollow structure, which is used to receive and distribute the gas-liquid mixed fluid from the second micro-nano ejector 302. The aeration body 203a includes an aeration inlet 203c formed at the bottom, and the aeration inlet 203c is connected to the second jet inlet 201b through a pipeline. A plurality of nozzles 203b are arranged circumferentially at the lower part of the aeration body 203a, and the nozzles 203b extend obliquely toward the lower part of the second tank body 201, so that the fluid can be sprayed to the bottom of the tank body, thereby improving the ozone aeration effect. The outlet end of the nozzle 203b has a porous nozzle to improve the dispersion effect and refinement of the gas-liquid mixed fluid. The porous nozzle can subdivide the gas-liquid mixed fluid into smaller droplets or bubbles, thereby increasing the contact area between the gas-liquid mixed fluid and the wastewater in the second tank body 201, accelerating the chemical reaction or biodegradation process, and improving the overall treatment efficiency. Ozone and wastewater are premixed through the second micro-nano injector 302 to form a gas-liquid mixture fluid, which is then introduced into the aeration body 203a through a pipeline. Inside the aeration body 203a, the gas-liquid mixture fluid is further distributed and directed to each nozzle 203b, which sprays the gas-liquid mixture fluid at a high speed to the lower area of ​​the second tank body 201 at an inclined angle, and the porous nozzle ensures that the gas-liquid mixture fluid is evenly dispersed in the form of droplets or bubbles, which not only enhances the mixing effect of the gas-liquid mixture fluid, but also promotes the full reaction and treatment of the wastewater in the second tank body 201. In an embodiment not shown, a rolling bearing is arranged at the connection between the aeration inlet 203c and the pipeline, so that the aeration body 203a can rotate relative to the pipeline, and the multiple nozzles 203b deflect in the same direction at a certain angle in the horizontal direction. When the multiple nozzles 203b simultaneously spray gas-liquid mixture fluids, these fluids not only impact the wastewater at a certain speed, but also drive the aeration body 203a to rotate relative to the pipeline through its momentum transfer effect. This rotation action produces a cyclonic aeration effect in the second tank 201. As the aeration body 203a rotates, the gas-liquid mixture fluid is more evenly dispersed into the wastewater, forming a dynamic, three-dimensional mixing area. This cyclonic flow promotes sufficient contact between suspended matter and dissolved oxygen in the wastewater, thereby improving the biodegradability of the wastewater.

[0037] like Figure 1 and Figure 2As shown, the ozone generating unit 3 is used to generate ozone to supply ozone to the second micro-nano injector 202. The ozone generating unit 3 includes an ozone generator 301, and the ozone generator 301 includes an ozone output port 301a formed at 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 a plurality of 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 being overheated and damaged. The working principle of the ozone generator 301 is based on high-voltage discharge technology. Specifically, when a potential difference is formed between the high-voltage electrode and the low-voltage electrode, the oxygen molecules in the air are ionized to form negatively charged oxygen ions. Driven by the electric field force, these oxygen ions collide with the surrounding oxygen molecules at high frequency, releasing a large amount of energy. In this process, some oxygen molecules are excited and decomposed into oxygen atoms. Subsequently, these oxygen atoms combine with undecomposed oxygen molecules to form ozone molecules (O3). As ozone molecules are continuously generated and accumulated, they are exported through the ozone output port 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 will be fully mixed and contacted with the wastewater, and the strong oxidizing property of ozone will be used to deeply oxidize and decompose the organic matter, inorganic matter, microorganisms, etc. in the wastewater, thereby achieving purification of the wastewater.

[0038] 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 generating 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 achieves effective removal of suspended solids and colloidal substances in the wastewater by adjusting 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 make full use of the strong oxidizing property of ozone to deeply oxidize and decompose organic matter, inorganic matter and microorganisms in the wastewater. In the ozone generating unit 3, the control unit 4 ensures the stable generation and efficient transmission of ozone by real-time monitoring of its working status and ozone generation.

[0039] like Figure 1 , 2As shown in Figures 8 and 9, the mobile unit 5 is used to load the flocculation aeration unit 1, the ozone aeration unit 2, the ozone generating 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 is 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 a plurality of wheels 501a and a fixing mechanism 501b. The flocculation aeration unit 1, the ozone aeration unit 2, the ozone generating unit 3 and the control unit 4 are all located on the mobile platform 501. In this embodiment, the number of wheels 501a is four, and the four wheels 501a are fixed to the four corners of the bottom of the mobile platform 501. The fixing mechanism 501b includes four hydraulic structures, and the four hydraulic structures 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 affecting the treatment effect due to 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 feet 501c2 set at the bottom of the flat plate 501c1, and the support feet 501c2 make the flat plate 501c1 leave the mobile platform 501 a certain distance, and the first micro-nano ejector 102 and the second micro-nano ejector 202 are both located on the flat plate 501c1, and the flocculation stirring device can also be set on the flat plate 501c1, and the flat plate 501c1 and the mobile platform 50 1 is also provided with a sludge temporary storage box 501d and a pre-treated wastewater temporary storage box 501e, the sludge inlet 501d1 of the sludge temporary storage box 501d is connected with the sludge outlet 101e of the first tank body 101, the side of the sludge temporary storage box 501d is also provided with a sludge outlet 501d2, the inlet 501e1 of the pre-treated wastewater temporary storage box 501e is connected with the liquid outlet 201c of the second tank body 201, and the pre-treated wastewater temporary storage box 501e is also provided with an outlet 501e2 for docking with subsequent treatment equipment. In an embodiment not shown, a plurality of side baffles are also provided on the mobile platform 501, and the plurality of side baffles are vertically arranged on the mobile platform 501, and the space enclosed by them is used to accommodate the flocculation aeration unit 1, the ozone aeration unit 2, the ozone generating unit 3 and the control unit 4, so that they are not affected by the external environment during the movement, and when treatment is required, only the side baffles need to be removed.

[0040] 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 through the four wheels 501a at the bottom of the mobile platform 501, and then extending and supporting it on the ground through the four hydraulic support rods of the fixing mechanism 501b, so as to fix 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 agent 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 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 generating unit 3 is started to generate high concentration ozone gas, and at the same time, the second micro-nano ejector 202 is started to mix the ozone with the wastewater in the second tank 201 to form a jet gas-liquid mixed fluid, and then sprayed into the second tank 201 from the second jet inlet 201b to perform ozone aeration. The pretreated wastewater is discharged from the drain port 201c of the second tank 201.

[0041] In general, the mobile device for pretreatment of high-difficulty 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 pretreating high-difficulty 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 high-difficulty wastewater to be treated, which is suitable for scattered, small-volume, and small-footprint wastewater from special industries, and can achieve on-site treatment of wastewater, avoid pollution risks during wastewater transportation, and improve the efficiency and safety of wastewater treatment. The mobile device of the present invention uses a first micro-nano ejector and a second micro-nano ejector, and utilizes a conical nozzle design based on the Venturi principle to achieve integration of efficient aeration and push flow. And no additional fan is needed. Only the pressure difference generated by the delivery pump forms a negative pressure area (below -0.085Mpa) inside the nozzle, naturally inhaling a large amount of air or ozone, and cutting it into tiny bubbles or ozone bubbles (diameter of about 100nm to 200nm), increasing the gas-liquid contact area, and promoting the rapid dissolution and efficient utilization of oxygen or ozone (utilization rate of more than 45%). This micro-nano-scale bubble not only strengthens the redox reaction of wastewater, but also significantly improves the mixing efficiency, ensuring that the pollutants in the wastewater can be fully oxidized and decomposed, further improving the pretreatment effect.

[0042] 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 equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A mobile device for pretreatment of high-difficulty wastewater, characterized in that: The mobile device comprises: 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 disposed outside the first tank body, and an 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 a liquid discharge port formed on the bottom, the liquid inlet is communicated with the overflow port, a second micro-nano ejector is disposed outside the second tank body, and an output end of the second micro-nano ejector is communicated with the second jet inlet; an ozone generating unit, the ozone generating unit being used to generate ozone so as to supply the ozone to the second micro-nano injector; A control unit, wherein the control unit is 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. A 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 ejector tube and a first delivery pump arranged in series, the first venturi ejector tube includes an air inlet formed at the top, and a first gas-liquid mixture outlet formed at the side, the first gas-liquid mixture outlet is connected to the first ejector 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 reagent inlet are respectively extended to the inside of the guide tube through pipelines, and the first jet inlet is extended to the inside of the guide tube through a pipeline. 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 ejector tube and a second delivery pump arranged in series, the second venturi ejector 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 ejector 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 injector 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 inside 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.

6. A mobile device for pre-treatment of high-difficulty 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 at 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 comprises a mobile platform, a plurality of wheels and a fixing mechanism are arranged at the lower part 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 arranged on the mobile platform, and the support frame 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 leave the mobile platform by a certain distance, and the first micro-nano injector and the second micro-nano injector are both located on the flat plate, and a sludge storage box and a pre-treated wastewater storage box are also arranged between the flat plate and the mobile platform, and the sludge inlet of the sludge storage box is connected with the sludge discharge port of the first tank body, and the inlet of the pre-treated wastewater storage box is connected with 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; Add high-difficulty wastewater into the first tank through the wastewater inlet, and add flocculant through the reagent inlet; The first micro-nano ejector is started to mix 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 from the first jet inlet to perform flocculation 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 the ozone with the wastewater in the second tank body to form a jet gas-liquid mixed fluid, and spraying the jet gas-liquid mixed fluid into the second tank body 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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