Efficient dissolved air flotation sewage treatment equipment

Abstract

The present application relates to a kind of high-efficiency dissolved air flotation sewage treatment equipment, it relates to the technical field of sewage treatment, it includes box, slagging mechanism, sludge discharge mechanism, water outlet pipe and water inlet pipe, slagging mechanism includes first motor, transmission chain, transmission wheel, mounting seat and scraper, multiple transmission wheels are rotatably installed on the box, transmission rod is fixedly installed between opposite two transmission wheels, first motor is fixedly installed on the upper end of the box, the output shaft of first motor is drivingly connected with one of transmission wheel, transmission chain is sleeved on transmission wheel, multiple mounting seats are fixedly installed on transmission chain, the two ends of mounting seat are each fixedly connected with one transmission chain, scraper is fixedly installed on mounting seat, the end of box close to first motor is fixedly installed with slag collection box, slag collection box one side is fixedly installed with slag collection inclined platform.The present application can realize reverse scraping dross, improve water purification efficiency simultaneously.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a high-efficiency dissolved air flotation wastewater treatment device. Background Technology

[0002] In the field of wastewater treatment, dissolved air flotation technology is widely used in municipal and various industrial wastewater treatments because it can effectively remove pollutants such as fine suspended particles and emulsified oil. Its core principle is to dissolve air to form supersaturated dissolved air water. After release, the generated microbubbles collide and adhere with pollutants to form scum, which is removed by a scum scraper. The clean water is discharged from the outlet, and the sludge is discharged from the sludge discharge outlet.

[0003] Currently, a Chinese invention patent with publication number CN116589060A and publication date of August 15, 2023, proposes an integrated electrocoagulation-flotation-sedimentation device, which integrates electrochemical, flotation and sedimentation processes. By using an octagonal releaser to generate microbubbles in the electrocoagulation-flotation zone, combined with the electrochemical action of the electrode plate, flocs and microbubbles are formed, which improves the removal efficiency of suspended solids and organic matter. The sedimentation and scum removal process is optimized by using inclined hexagonal honeycomb tubes and liquid level regulators.

[0004] Regarding the aforementioned technologies, firstly, the scum scraping direction of the equipment is consistent with the water flow direction, which prolongs the residence time of sewage in the tank. This not only undermines the flocculation effect of the chemicals, causing the flocs to become loose, but also causes air bubbles to coalesce and burst, reducing adsorption efficiency and affecting solid-liquid separation. Secondly, the sludge discharge ports are mostly located in the middle of the equipment and are multiple in different areas. Because the amount of sludge in each area is uneven, frequent manual inspections and adjustments to the sludge discharge frequency and amount at each port are required. This operation is cumbersome and prone to problems such as untimely sludge discharge leading to blockage or excessive sludge discharge wasting clean water. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a high-efficiency dissolved air flotation wastewater treatment device.

[0006] This invention provides a high-efficiency dissolved air flotation wastewater treatment device, which adopts the following technical solution: A high-efficiency dissolved air flotation wastewater treatment device includes a tank, a sludge scraping mechanism, a sludge discharge mechanism, an outlet pipe, and an inlet pipe. The sludge scraping mechanism includes a first motor, a transmission chain, transmission wheels, mounting bases, and scrapers. Multiple transmission wheels are rotatably mounted on the tank, and a transmission rod is fixedly installed between two opposite transmission wheels. The first motor is fixedly mounted on the upper end of the tank, and the output shaft of the first motor is connected to one of the transmission wheels. The transmission chain is sleeved on the transmission wheels, and multiple mounting bases are fixedly mounted on the transmission chain. Each end of the mounting base is fixedly connected to one of the transmission chains. The scraper is fixedly mounted on the mounting base. A sludge collection box is fixedly installed on one end of the tank near the first motor, and a sludge collection ramp is fixedly installed on one side of the sludge collection box. The sludge discharge mechanism includes a second motor, a sludge discharge trough, a sludge discharge rod, and a sludge discharge plate. The sludge discharge trough is fixedly installed at the bottom of the housing, and the bottom of the housing is tapered. The sludge discharge rod is rotatably installed in the sludge discharge trough. The second motor is fixedly installed on the housing, and the output shaft of the second motor is connected to the sludge discharge rod for transmission. The sludge discharge plate is spirally fixedly installed on the sludge discharge rod to form a spiral propulsion structure. A sludge discharge pipe is fixedly connected to one end of the sludge discharge trough. The water inlet pipe is fixedly installed at the lower end of the housing, and the water inlet pipe is located below the first motor. The water outlet pipe is installed at the end of the housing away from the water inlet pipe. The box is equipped with a dissolved air mechanism that releases dissolved air water.

[0007] Preferably, a flow regulating mechanism is also fixedly installed inside the box. The flow regulating mechanism includes a baffle, a bottom plate, an adjusting plate, and an intermediate plate. The baffle is fixedly installed inside the box. The bottom plate is fixedly installed at the lower end between the baffle and the side wall of the box. The bottom end of the intermediate plate is fixedly connected to the bottom plate. The side ends of the intermediate plate are fixedly connected to the box and the baffle, respectively. An overflow port is provided at the upper end of the intermediate plate. A guide plate is fixedly installed on the intermediate plate. The adjusting plate is slidably installed between the guide plate and the intermediate plate. An adjusting rod is fixedly installed at the top of the adjusting plate. The baffle divides the inside of the box into a contact separation area and a clear water area. The other end of the clear water area relative to the intermediate plate is the water outlet area. The water outlet area is connected to the water outlet pipe on the box.

[0008] Preferably, a bracket is fixedly installed between the baffle and the box body, an adjusting seat is rotatably installed on the bracket, the adjusting rod is a screw rod, the adjusting rod is threadedly connected to the adjusting seat, and an adjusting handle is fixedly installed on the upper end of the adjusting seat.

[0009] Preferably, the dissolved gas mechanism includes an air inlet device, a dissolved gas pump, a dissolved gas inlet water pipe, a dissolved gas outlet water pipe, and a dissolved gas tank. The air inlet device is mounted on the housing, and its air supply end is connected to the air inlet end of the dissolved gas tank. The water inlet end of the dissolved gas pump is connected to the dissolved gas inlet water pipe, and its water outlet end is connected to the dissolved gas outlet water pipe. A dissolved gas release device is connected to the bottom of the dissolved gas tank, and the dissolved gas release device is located in the contact separation zone inside the housing.

[0010] Preferably, the dissolved gas mechanism further includes a water distribution tank, a connecting pipe, and a regulating valve. One end of the water distribution tank is connected to the dissolved gas outlet pipe. Multiple connecting pipes are evenly distributed on the water distribution tank. The other end of the connecting pipe extends into the box and is connected to the dissolved gas release device. Multiple dissolved gas release devices are correspondingly provided. A regulating valve is installed on the connecting pipe.

[0011] Preferably, the dissolved gas release device includes a large-diameter pipe and a small-diameter pipe. The large-diameter pipe is arranged axially parallel to the housing. The outlet end of the small-diameter pipe is connected to the large-diameter pipe. The outlet end of the small-diameter pipe is tangent to the outer edge of the large-diameter pipe. The inlet end of the small-diameter pipe is connected to the connecting pipe.

[0012] Preferably, a spiral guide groove is formed inside the large-diameter pipe, and the spiral direction of the spiral guide groove is opposite to that of the two sides of the small-diameter pipe.

[0013] Preferably, a strong magnet is fixedly installed at the lower end of the slag collection ramp, a rotating shaft is rotatably installed on the mounting base, and the scraper is rotatably installed on the rotating shaft. The scraper close to the slag collection ramp is attracted to the inclined surface of the slag collection ramp by the strong magnet.

[0014] Preferably, the slag scraping mechanism further includes an elastic membrane, and a plurality of scrapers are rotatably mounted on the rotating shaft. Two adjacent scrapers are fixedly connected to each other through the elastic membrane, and the bottom end of the elastic membrane abuts against the inclined surface of the slag collecting ramp.

[0015] Preferably, the air intake device includes an air intake pipe, a pressure reducing valve, and a gas flow meter. One end of the air intake pipe is connected to a gas source, and the other end is connected to the air intake end of the dissolved gas tank. The pressure reducing valve and the gas flow meter are installed on the air intake pipe. A control terminal is also installed on the housing. The control terminal is electrically connected to the first motor, the second motor, the gas flow meter, and the pressure reducing valve.

[0016] In summary, the present invention has at least one of the following beneficial technical effects: 1. By setting the inlet below the starting point of the sludge scraping, the outlet at the farthest point, and the sludge collection box at the foremost point, reverse sludge scraping is achieved. This also completely separates the top scum, bottom flocculent sediment, and the clear water at the far end, preventing the flocs from escaping due to bubble dissipation and secondary suspension during long-distance drift, and significantly reducing the risk of tiny impurities entering the outlet.

[0017] 2. The screw propulsion structure driven by a second motor replaces the gravity-fed sludge discharge of traditional dissolved air flotation tanks. Forced mechanical sludge discharge can effectively handle the high concentration and high viscosity of sludge generated by bottom sedimentation, which not only greatly reduces the number of sludge discharge ports, but also completely eliminates the technical problems of sludge accumulating and clogging in dead corners of the sludge hopper.

[0018] 3. To address the varying thicknesses of scum layers generated by wastewater of different concentrations, operators can adjust the overflow port height using the lifting and adjusting plate to precisely match the optimal water depth of the scraper. This prevents the scraper from "sweeping away" and missing scum due to excessively low water levels, while also preventing the scraper from carrying away a large amount of clean water due to excessively high water levels, thus reducing the scum concentration and ensuring that the discharged scum has a low moisture content and is thoroughly scraped away.

[0019] 4. The distribution tank acts as a pressure stabilizing and buffering system, distributing the high-pressure turbulent flow from the main pipeline evenly and uniformly into each branch pipeline, achieving full coverage release of microbubbles at the bottom of the entire contact separation zone. This eliminates dead zones and blind spots in the water treatment cross-section, increasing the probability of contact capture of suspended solids and bubbles in the wastewater.

[0020] 5. The parallel shape and horizontal arrangement of the large-diameter pipes are conducive to the lateral axial extension of the vortex inside the pipe and the uniform release of energy, making the generated microbubble bundles wider and more uniformly diffused into the water above the tank, thus expanding the coverage area of ​​the single-point release.

[0021] 6. The magnetic suction structure achieves a near-seamless rigid fit between the bottom of the scraper and the inclined surface, enabling sealed cleaning of the scum on the inclined surface, greatly improving the purity of the skimmed scum and the collection efficiency of the scum collection box.

[0022] 7. The elastic membrane fills the mechanical gaps between the scrapers, transforming the previously intermittent scraping that caused air and water leakage into a complete, closed slag collection net space. The elastic membrane allows adjacent scrapers to adaptively adjust their contact angle as they absorb slag, preventing the situation where a single, integral scraper cannot properly adhere to the slag collection platform. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 This is a cross-sectional schematic diagram of Embodiment 1 of the present invention; Figure 3This is a schematic diagram of the flow regulation mechanism in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the dissolved gas release device in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the air intake device in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 7 This is a schematic diagram of the internal structure of the elastic membrane in Embodiment 2 of the present invention.

[0024] Explanation of reference numerals in the attached drawings: 100, box body; 110, slag collection box; 120, slag collection ramp; 130, water outlet pipe; 140, water inlet pipe; 150, contact separation zone; 160, clear water zone; 170, water outlet zone; 200, slag scraping mechanism; 210, first motor; 220, transmission chain; 230, transmission wheel; 240, mounting base; 250, scraper; 260, transmission rod; 270, strong magnet; 280, rotating shaft; 290, elastic membrane; 300, sludge discharge mechanism; 310, second motor; 320, sludge discharge trough; 330, sludge discharge rod; 340, sludge discharge plate; 350, sludge discharge pipe; 400, flow regulation mechanism; 410, baffle. ; 420, Base plate; 441, Adjusting plate; 442, Intermediate plate; 443, Guide plate; 444, Adjusting rod; 460, Overflow port; 470, Support; 480, Adjusting seat; 490, Adjusting handle; 500, Dissolving gas mechanism; 510, Air inlet device; 511, Air inlet pipe; 512, Pressure reducing valve; 513, Gas flow meter; 520, Dissolving gas pump; 530, Dissolving gas inlet pipe; 540, Dissolving gas outlet pipe; 550, Dissolving gas tank; 560, Dissolving gas release device; 561, Large diameter pipe; 562, Small diameter pipe; 563, Spiral guide channel; 570, Water distribution tank; 580, Connecting pipe; 590, Adjusting valve; 600, Control terminal. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1 To be continued Figure 7 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0027] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0030] This invention discloses a high-efficiency dissolved air flotation wastewater treatment device. (Refer to...) Figures 1 to 5A high-efficiency dissolved air flotation wastewater treatment device mainly includes a tank 100, a sludge scraping mechanism 200, a sludge discharge mechanism 300, an outlet pipe 130, and an inlet pipe 140. The sludge scraping mechanism 200 includes a first motor 210, a transmission chain 220, transmission wheels 230, mounting bases 240, and scrapers 250. Multiple transmission wheels 230 are rotatably mounted on the tank 100, and a transmission rod 260 is fixedly installed between two opposite transmission wheels 230. The first motor 210 is fixedly mounted on the upper end of the tank 100, and the output shaft of the first motor 210 is connected to one of the transmission wheels 230. The transmission chain 220 is sleeved on the transmission wheels 230. Multiple mounting bases 240 are fixedly mounted on the transmission chain 220, and each end of the mounting base 240 is fixedly connected to a transmission chain 220. The scrapers 250 are fixedly mounted on the mounting bases 240. A sludge collection box 1 is fixedly installed on the end of the tank 100 near the first motor 210. 10. A slag collection ramp 120 is fixedly installed on one side of the slag collection box 110; the sludge discharge mechanism 300 includes a second motor 310, a sludge discharge trough 320, a sludge discharge rod 330, and a sludge discharge plate 340. The sludge discharge trough 320 is fixedly installed at the bottom of the box body 100, and the bottom of the box body 100 is tapered. The sludge discharge rod 330 is rotatably installed in the sludge discharge trough 320. The second motor 310 is fixedly installed on the box body 100, and the output shaft of the second motor 310 is connected to the discharge plate. The mud rod 330 is driven and connected, and the mud discharge plate 340 is fixedly installed on the mud discharge rod 330 in a spiral shape to form a spiral propulsion structure. One end of the mud discharge bottom trough 320 is fixedly connected to the mud discharge pipe 350. The water inlet pipe 140 is fixedly installed at the lower end of the box 100, and the water inlet pipe 140 is located below the first motor 210. The water outlet pipe 130 is installed at the end of the box 100 away from the water inlet pipe 140. The dissolved air mechanism 500 for releasing dissolved air water is installed inside the box 100.

[0031] Wastewater enters the tank 100 through the inlet pipe 140 located below the first motor 210. At this time, the high-pressure dissolved air water released by the dissolved air mechanism 500 is depressurized instantly in the contact separation zone 150, releasing a large number of microbubbles. Impurities in the wastewater aggregate to form flocs under the action of the previous agents, and bidirectional solid-liquid separation occurs inside the system: the lighter flocs collide with the microbubbles and adhere deeply, and are quickly lifted to the water surface by buoyancy to form dense scum; while the heavier impurities and flocs are detached from the bubbles and undergo flocculent sedimentation under gravity, falling into the bottom of the conical tank 100 and gradually falling into the sludge discharge trough 320.

[0032] The scum is driven by the first motor 210 to drive the transmission wheel 230, transmission chain 220 and mounting base 240 to drive the scraper 250 to rotate in a cycle. The scraper 250 scrapes away the scum in the opposite direction to the scum collection box 110 near the first motor 210. Here, "opposite direction" means against the direction of sewage flow. At the same time, the sludge that has settled at the bottom enters the fixed sludge discharge pipe 350. The second motor 310 drives the sludge discharge rod 330 and the sludge discharge plate 340 fixedly installed in a spiral shape to form a spiral propulsion structure, which forcibly pushes the settled sludge in the sludge discharge bottom tank 320 to the sludge discharge pipe 350 at the other end. The treated solid-liquid separated clear water is discharged from the water outlet pipe 130.

[0033] The inlet is located below the starting point of the sludge scraping, the outlet pipe 130 is located at the farthest end, and the sludge collection box 110 is located at the foremost end. This achieves reverse sludge scraping and completely separates the physical space between the top scum, the bottom flocculent sediment, and the clear water at the far end, preventing the flocculents from escaping due to bubble dissipation and secondary suspension during long-distance drift, and significantly reducing the risk of tiny impurities being mixed into the outlet.

[0034] The screw propulsion structure driven by the second motor 310 replaces the gravity-fed sludge discharge of the traditional dissolved air flotation tank. Forced mechanical sludge discharge can effectively handle the high concentration and high viscosity of sludge generated by bottom sedimentation, which not only greatly reduces the number of sludge discharge ports, but also completely eliminates the technical problems of sludge accumulation and clogging in dead corners of the sludge hopper.

[0035] The transmission rod 260 enhances the structural stability between the relative transmission wheel 230. Together with the mounting base 240 fixed at both ends on the transmission chain 220, it ensures that the wide scraper 250 is subjected to uniform and stable force when scraping off the thick layer of scum on the water surface, and prevents the scraper 250 from deviating.

[0036] Reference Figures 1 to 3 In some embodiments, a flow regulating mechanism 400 is also fixedly installed inside the housing 100. The flow regulating mechanism 400 includes a baffle 410, a bottom plate 420, an adjusting plate 441, and an intermediate plate 442. The baffle 410 is fixedly installed inside the housing 100, the bottom plate 420 is fixedly installed at the lower end between the baffle 410 and the side wall of the housing 100, the bottom end of the intermediate plate 442 is fixedly connected to the bottom plate 420, and the side ends of the intermediate plate 442 are fixedly connected to the housing 100 and the baffle 410, respectively. An overflow port 460 is provided at the upper end of the 442. A guide plate 443 is fixedly installed on the intermediate plate 442. An adjusting plate 441 is slidably installed between the guide plate 443 and the intermediate plate 442. An adjusting rod 444 is fixedly installed at the top of the adjusting plate 441. A baffle 410 divides the inside of the tank 100 into a contact separation area 150 and a clean water area 160. The other end of the clean water area 160 relative to the intermediate plate 442 is the water outlet area 170. The tank 100 at the water outlet area 170 is connected to the water outlet pipe 130.

[0037] The internal space of the tank 100 is divided into a contact separation zone 150 and a clear water zone 160 by a fixedly installed baffle 410; the bottom of the clear water zone 160 is further defined by a bottom plate 420 and an intermediate plate 442 to define a water outlet zone 170. A guide plate 443 is fixedly installed on the intermediate plate 442, and an adjusting plate 441 slides up and down between the guide plate 443 and the intermediate plate 442 via an adjusting rod 444 fixedly installed at its top, thereby changing the relative height of the overflow port 460 opened at the upper end of the intermediate plate 442 and realizing dynamic control of the water level in the contact separation zone 150 inside the tank 100.

[0038] A multi-stage hydraulic zone was constructed, consisting of a flow stabilization zone, a buffer zone, and a clear water collection zone. This multi-zone design prevents the front-end water flow from directly impacting the outlet zone 170, ensuring a smooth transition of the water flow from air flotation separation to discharge, and reducing the interference of water flow turbulence on the separation effect.

[0039] Utilizing the principle of communicating vessels, the flotation unit is endowed with the ability to "adapt to water level." Faced with scum layers of varying thicknesses produced by wastewater of different concentrations, the operator can adjust the height of the overflow port 460 via the lifting adjustment plate 441 to precisely match the optimal draft of the scraper 250. This prevents the scraper 250 from missing any scum due to excessively low water levels, and also prevents the scraper 250 from carrying away a large amount of clean water due to excessively high water levels, thus reducing the scum concentration and ensuring that the discharged scum has a low moisture content and is thoroughly removed.

[0040] Reference Figure 3 In some embodiments, a bracket 470 is fixedly installed between the baffle 410 and the housing 100. An adjusting seat 480 is rotatably installed on the bracket 470. The adjusting rod 444 is a screw rod, and the adjusting rod 444 is threadedly connected to the adjusting seat 480. An adjusting handle 490 is fixedly installed on the upper end of the adjusting seat 480.

[0041] An adjusting seat 480 is rotatably mounted on a bracket 470 fixedly installed between the baffle 410 and the housing 100. When the operator rotates the adjusting handle 490 fixedly installed on the upper end of the adjusting seat 480, since the adjusting rod 444 is a screw and is threadedly connected to the adjusting seat 480, the rotational motion of the adjusting seat 480 is converted into the vertical up-and-down linear motion of the adjusting rod 444, thereby smoothly driving the adjusting plate 441 connected below to perform precise lifting and lowering.

[0042] The threaded fit has a natural self-locking property, which means that even under strong water flow impact or equipment vibration, the adjusted water level will not automatically shift or slip, ensuring the absolute stability and reliability of the water level during continuous equipment operation. This reduces the labor intensity of manual operation; operators only need to turn the handle on top of the equipment to make fine adjustments to the water level. The adjustment process is smooth, stable, labor-saving, and safe.

[0043] Reference Figure 1 , Figure 2 and Figure 4 In some embodiments, a dissolved gas mechanism 500 is also installed inside the housing 100. The dissolved gas mechanism 500 includes an air inlet device 510, a dissolved gas pump 520, a dissolved gas water inlet pipe 530, a dissolved gas water outlet pipe 540, and a dissolved gas tank 550. The air inlet device 510 is installed on the housing 100. The air supply end of the air inlet device 510 is connected to the air inlet end of the dissolved gas tank 550. The water inlet end of the dissolved gas pump 520 is connected to the dissolved gas water inlet pipe 530. The water outlet end of the dissolved gas pump 520 is connected to the dissolved gas water outlet pipe 540. The water inlet of the dissolved gas water inlet pipe 530 is connected to the clear water area 160 inside the housing 100. A dissolved gas release device 560 is connected to the bottom end of the dissolved gas tank 550. The dissolved gas release device 560 is located inside the contact separation area 150 inside the housing 100.

[0044] An air intake device 510 is installed on the housing 100. Its air supply end sends high-pressure air into the air intake end of the dissolved air tank 550 connected to it. At the same time, the water inlet end of the dissolved air pump 520 draws treated clean water from the housing 100 through the dissolved air water inlet pipe 530, and forces it into the dissolved air tank 550 through the dissolved air water outlet pipe 540. After the high-pressure water and high-pressure air are mixed in the dissolved air tank 550 to form dissolved air water, it is output from the bottom end of the dissolved air tank 550 and finally enters the dissolved air release device 560 located in the contact separation zone 150 of the housing 100 for depressurization and release.

[0045] By using a dissolved air pump 520 to force water and pressurized gas to mix under high pressure inside the tank, the physical solubility of the gas in water is greatly improved, ensuring that the generated dissolved air water is in a highly saturated state, providing sufficient material support for the subsequent generation of a large number of dense microbubbles.

[0046] Extracting treated clean water prevents physical blockage of the subsequent dissolved air tank 550 and precision release device, significantly extending the maintenance-free cycle and service life of the equipment. Simultaneously, the purer water quality reduces gas-liquid mass transfer resistance, not only increasing the absolute solubility of air in water but also releasing smaller, denser micron-sized pure bubbles during decompression, effectively improving the overall solid-liquid separation and capture rate. This also forms a closed-loop water circuit within the equipment, eliminating the need for external tap water as the dissolved air mother liquor. This saves water resources and reduces long-term operating costs, making the flotation unit a highly integrated, self-sufficient, independent processing unit.

[0047] Reference Figure 1In some embodiments, the dissolved gas mechanism 500 further includes a water distribution tank 570, a connecting pipe 580, and a regulating valve 590. One end of the water distribution tank 570 is connected to the dissolved gas outlet pipe 540. Multiple connecting pipes 580 are evenly distributed on the water distribution tank 570. The other end of the connecting pipe 580 extends into the housing 100 and is connected to the dissolved gas release device 560. Multiple dissolved gas release devices 560 are correspondingly provided. A regulating valve 590 is installed on the connecting pipe 580.

[0048] The high-pressure dissolved air water delivered by the dissolved air outlet pipe 540 first enters one end of the connected water distribution tank 570; multiple connecting pipes 580 evenly installed on the water distribution tank 570 divert the high-pressure dissolved air water, and the regulating valves 590 installed on the connecting pipes 580 control and balance the flow of each branch; then, the dissolved air water enters the corresponding multiple dissolved air releasers 560 through the other end of the connecting pipes 580 that extend into the tank 100, and is simultaneously depressurized and released at multiple points inside the tank 100.

[0049] The 570 water distribution tank acts as a pressure stabilizing and buffering manifold, distributing the high-pressure turbulent flow from the main pipeline evenly and uniformly to each branch pipeline, achieving full coverage release of microbubbles at the bottom of the entire contact separation zone 150. This eliminates dead zones and blind spots in the water treatment cross-section, increasing the probability of contact capture of suspended solids and bubbles in the wastewater.

[0050] Operators can independently open, close, or fine-tune the dissolved air output of each release device according to the differences in water flow load, swirling state, or suspended solids concentration in different areas of the pool, so that the bubble distribution achieves optimal dynamic matching with the actual water quality conditions, thereby improving the overall equipment's resistance to load shocks.

[0051] Reference Figure 2 and Figure 4 In some embodiments, the dissolved gas release device 560 includes a large-diameter pipe 561 and a small-diameter pipe 562. The large-diameter pipe 561 is axially parallel to the housing 100. The outlet end of the small-diameter pipe 562 is connected to the large-diameter pipe 561, and the outlet end of the small-diameter pipe 562 is tangent to the outer edge of the large-diameter pipe 561. The inlet end of the small-diameter pipe 562 is connected to the connecting pipe 580.

[0052] Pressurized dissolved air water enters the inlet end of the small diameter pipe 562 of the dissolved air release device 560 through the connecting pipe 580. It then rushes tangentially at high speed into the large diameter pipe 561 connected to it and arranged axially parallel inside the housing 100. By utilizing the sudden change in pipe diameter and tangential jet, a strong high-speed rotating centrifugal cyclone is instantly generated inside the pipe, completing the drastic decompression and microbubble precipitation.

[0053] Utilizing the principles of jetting and swirling in fluid mechanics, the straight-flowing dissolved gas water is transformed into a high-speed centrifugal swirling flow. This tangential swirling structure not only instantly generates a huge local pressure drop, disrupting the gas-liquid balance and promoting the rapid and large-scale precipitation of dissolved gas, but also, compared to traditional microporous plates or gas release needle valves, its large-diameter tangential water inlet structure is extremely less prone to clogging by impurities, greatly extending the maintenance-free cycle and service life of the equipment.

[0054] The parallel shape and horizontal arrangement of the large-diameter pipe 561 are conducive to the lateral axial extension of the vortex inside the pipe and the uniform release of energy, so that the generated microbubble bundles are wider and more uniformly diffused into the water above the tank 100, expanding the coverage area of ​​single-point release.

[0055] Reference Figure 4 In some embodiments, a spiral guide groove 563 is provided inside the large-diameter pipe 561, and the spiral direction of the spiral guide groove 563 is opposite to that of the two sides of the small-diameter pipe 562.

[0056] As the high-speed rotating water flow tangentially enters the large-diameter pipe 561 from the small-diameter pipe 562 and diffuses towards both ends of the pipe, it is forcibly guided by the spiral guide grooves 563 inside the large-diameter pipe 561. Because the spiral directions of the spiral guide grooves 563 inside the large-diameter pipe 561 are opposite to those on both sides of the small-diameter pipe 562, the high-speed swirling flow is forced to undergo violent collisions, intense backflips, and extreme fluid shearing within the pipe. The spiral grooves in opposite directions artificially create extremely strong reverse fluid shear forces and micro-turbulent nodules. During the violent collisions and tearing of the water flow, the newly precipitated small bubbles are forcibly cut and pulverized secondary and tertiary, forming a cluster of even smaller high-frequency microbubbles. Because the bubbles are extremely finely cut, their rising speed is greatly reduced, and they stay in the water for a longer time. At the same time, the extremely fine microbubbles increase the overall surface area of ​​the bubbles, greatly enhancing their surface tension and adsorption capacity. This allows them to easily capture extremely fine suspended solids, emulsified oil, and lightweight flocs that are difficult to settle in the water, thus significantly breaking through the solid-liquid separation limit of traditional air flotation machines and greatly improving the decontamination efficiency.

[0057] Reference Figure 5 In some embodiments, the air intake device 510 includes an air intake pipe 511, a pressure reducing valve 512, and a gas flow meter 513. One end of the air intake pipe 511 is connected to a gas source, and the other end is connected to the air intake end of the dissolved gas tank 550. The pressure reducing valve 512 and the gas flow meter 513 are installed on the air intake pipe 511. A control terminal 600 is also installed on the housing 100. The control terminal 600 is electrically connected to the first motor 210, the second motor 310, the gas flow meter 513, and the pressure reducing valve 512.

[0058] The control terminal 600 has multiple preset operating programs and threshold parameters. Specifically, the control terminal 600 receives real-time analog or digital signal data of the intake air flow rate collected by the gas flow meter 513, and outputs a control signal to the pressure reducing valve 512 according to the preset processing load logic, so as to dynamically adjust the opening of the pressure reducing valve 512 to maintain the optimal dissolved gas pressure and intake air volume in the dissolved gas tank 550.

[0059] Simultaneously, based on the current air intake status and equipment load, the control terminal 600 synchronously outputs frequency conversion or start / stop signals to the first motor 210 and the second motor 310. For example, when the gas flow meter 513 detects an increase in air intake and the system is in a high-load dissolved gas state, the control terminal 600 determines that the amount of scum and sludge produced by the system has increased, and then sends an acceleration signal to the first motor 210 to increase the scraping frequency, and sends an start or acceleration signal to the second motor 310 to accelerate the spiral sludge discharge; conversely, when the system is in a low-load state, the control terminal 600 reduces the motor speed or makes it run intermittently, thereby achieving energy saving and consumption reduction while ensuring the solid-liquid separation effect, and completing the automated closed-loop control of the whole machine.

[0060] One end of the air inlet pipe 511 is connected to the air source, and the other end is connected to the air inlet of the dissolved air tank 550. The pressure is regulated and the air flow rate is monitored in real time via the pressure reducing valve 512 and gas flow meter 513 installed on it. The control terminal 600 installed on the housing 100 receives data feedback from the gas flow meter 513 in real time and outputs electrical signals according to the built-in control logic. This synchronously and dynamically controls the opening of the pressure reducing valve 512, the scraping frequency of the first motor 210, and the operating speed of the sludge discharge frequency of the second motor 310, achieving electrical coordination of the entire system. This enables real-time monitoring of operating data and adaptive adjustment of all actuators. It also achieves intelligent and precise matching between dynamic air source input and mechanical sewage discharge actions. For example, when the sensor detects low influent load, low gas consumption, and low scum production, the control terminal 600 automatically instructs the pressure reducing valve 512 to reduce the air pressure and simultaneously reduces the speed of the scraping motor and the sludge discharge motor. This not only significantly reduces the overall power consumption, gas consumption, and mechanical wear of the equipment, but also greatly reduces the frequency of on-site manual adjustment, frequent start-up and shutdown, and inspection, thus greatly improving the intelligence, stability, and overall economic benefits of the air flotation equipment.

[0061] The implementation principle of a high-efficiency dissolved air flotation wastewater treatment device according to an embodiment of the present invention is as follows: In terms of spatial layout, the inlet is located below the starting end of the sludge scraping, the outlet pipe 130 is located at the farthest end, and the sludge collection box 110 is located at the foremost end. This design achieves reverse sludge scraping, completely separating the physical space between the top floating sludge, the bottom flocculent sediment, and the distant clean water, preventing secondary suspension and reducing impurities in the effluent. For sludge discharge, a spiral propulsion structure driven by the second motor 310 replaces gravity-fed sludge discharge, forcibly discharging high-concentration, high-viscosity sludge, reducing the number of sludge discharge ports and eliminating the problem of dead-angle blockage in the sludge hopper. For liquid level control, the height of the overflow port 460 is adjusted by the lifting adjustment plate 441 to precisely match the optimal draft of the scraper 250, preventing missed scraping or water carryover, ensuring thorough sludge discharge with low moisture content. In the dissolved gas release stage, the water separator 570 acts as a pressure stabilizing and buffering drain, uniformly dispersing the high-pressure turbulent flow. Combined with the parallel shape and horizontal arrangement of the large-diameter pipe 561, the swirling energy is released uniformly, and the microbubble bundles diffuse more widely, achieving full coverage release at the bottom of the contact separation zone 150, completely eliminating dead zones and blind spots, and significantly improving the probability of contact capture between suspended matter and bubbles.

[0062] Example 2: This invention discloses a high-efficiency dissolved air flotation wastewater treatment device. (Refer to...) Figure 6 and Figure 7 A high-efficiency dissolved air flotation wastewater treatment device mainly includes a strong magnet 270 fixedly installed at the lower end of a sludge collection ramp 120, a rotating shaft 280 rotatably mounted on a mounting base 240, and a scraper 250 rotatably mounted on the rotating shaft 280. The scraper 250 near the sludge collection ramp 120 is attracted to the inclined surface of the sludge collection ramp 120 by the strong magnet 270. The strong magnet 270 can be a permanent magnet or an electromagnet. If it is a permanent magnet, neodymium iron boron (NdFeB) high-strength magnet is preferred. Considering the corrosiveness of the wastewater treatment environment, the NdFeB magnet is externally wrapped with an anti-corrosion coating or sealed in a stainless steel shell. The advantage of a permanent magnet is that it does not require an external power supply, has a simple structure, and a low failure rate. If it is an electromagnet, the strong magnet 270 is an electromagnet composed of an energized coil, and the electromagnet is electrically connected to the control terminal 600 of the equipment. The advantage of using an electromagnet is that its magnetic force is adjustable. The control terminal 600 can dynamically adjust the current input to the electromagnet according to the thickness and weight of the floating slag on the slag collection ramp 120, thereby changing the adsorption force. In addition, when the equipment is shut down for maintenance or when the scraper 250 needs to be reversed to detach from the ramp, the power can be directly cut off to eliminate the magnetism, which is convenient for maintenance.

[0063] In order to be effectively attracted by the strong magnet 270, the scraper 250 as a whole or its contact portion near the slag collection ramp 120 must contain a ferromagnetic material. Preferably, the scraper 250 adopts a composite structure of "rigid inside and flexible outside," with an internal iron core or magnetically conductive stainless steel skeleton and an external flexible wear-resistant layer such as polyurethane, rubber, or wear-resistant silicone. This ensures that the scraper 250 can be firmly attracted by the strong magnet 270, while the external flexible layer protects the surface of the slag collection ramp 120 from hard scratching and wear.

[0064] When the mounting base 240 moves to the area of ​​the slag collection ramp 120 via the transmission chain 220, the strong magnet 270 fixedly installed at the lower end of the slag collection ramp 120 generates a magnetic field that penetrates the ramp. This magnetic field directly acts on the scraper 250, which is rotated and installed on the rotating shaft 280, so that the scraper 250 close to the slag collection ramp 120 is firmly attracted by the strong magnet 270. This forces the scraper 250 to overcome its own gravitational torque and the buoyancy resistance of the water flow, and slide upward along the ramp of the slag collection ramp 120 throughout the entire process, scraping the scum into the slag collection box 110.

[0065] This invention solves the technical pain point of mechanical assembly gaps in traditional slag scrapers. Traditional rigid scrapers 250 are prone to gaps between the scraper 250 and the inclined surface during climbing the inclined platform due to chain slack or mechanical tolerances, causing the thickest, most concentrated slag at the bottom to be missed and flow back. The magnetic suction structure achieves a near-seamless, rigid fit between the bottom of the scraper 250 and the inclined surface, enabling sealed cleaning of the slag on the inclined surface, greatly improving the purity of the skimmed slag and the collection efficiency of the slag collection box 110.

[0066] The scraper 250 is rotatably mounted on the rotating shaft 280. This hinged free-rotation structure gives the scraper 250 sufficient freedom of movement. When the scraper 250 approaches the magnetic field, it can automatically flip, adjust and perfectly fit the slope angle in accordance with the magnetic force. This not only improves the tightness of the fit, but also avoids mechanical jamming, chain pulling and abnormal wear that may occur when the rigid connection is used for turning and climbing.

[0067] Reference Figure 6 and Figure 7 In some embodiments, the slag scraping mechanism 200 further includes an elastic membrane 290. Multiple scrapers 250 are rotatably mounted on the rotating shaft 280. Two adjacent scrapers 250 are fixedly connected to each other through the elastic membrane 290. The bottom end of the elastic membrane 290 abuts against the inclined surface of the slag collection ramp 120.

[0068] Multiple scrapers 250 are rotatably mounted on the rotating shaft 280, and adjacent scrapers 250 are fixedly connected to each other by an elastic membrane 290. When the scraper 250 is attracted by the strong magnet 270 and adheres to the inclined surface of the slag collection platform 120 and climbs upward, the elastic membrane 290 connected between them is fully unfolded as the spacing and angle of the scrapers 250 change, and its bottom end is in close contact with the inclined surface of the slag collection platform 120 and moves together with the scraper 250.

[0069] The elastic membrane 290 constructs a seamless, dynamically expanding and contracting flexible water- and slag-blocking curtain wall between the independent, spaced mechanical scrapers 250. The elastic membrane 290 fills the mechanical gaps between the scrapers 250, transforming the previously intermittent scraping that caused air and water leakage into a complete, closed slag-collecting net space. This cuts off the channels for slag backflow. During the inclined climbing phase, thin slag rich in moisture and highly fluid is easily backflowed back into the pool along the gaps at the edges of the scrapers 250 under gravity. The tight contact of the elastic membrane 290 acts like an extremely wide, soft scraper, completely sealing off all possible backflow paths, further solidifying the highly efficient, low-moisture-content, and perfect slag skimming results.

[0070] The elastic membrane 290 connects adjacent scrapers 250 into a rotating and independently adjustable bonding unit. When the scraper 250 is magnetically attracted and bonded to the inclined surface of the slag collection platform 120, each scraper 250 can be independently attracted and bonded. If the scraper 250 is a single piece, under mechanical stress and deformation, the bottom end of the scraper 250 may not bond tightly with the slag collection platform 120. The elastic membrane 290 allows adjacent scrapers 250 to adaptively adjust the bonding angle as they are attracted, thus avoiding the situation where a single scraper 250 does not bond tightly with the slag collection platform 120.

[0071] Reference Figure 6 and Figure 7 In some embodiments, an elastic element is fixedly installed on the mounting base 240, and the other end of the elastic element is fixedly connected to the scraper 250. The elastic element provides elastic support to the scraper 250, ensuring that the scraper 250 has a certain supporting capacity when scraping scum in the water, and can resist the reverse water flow, thereby improving the scraping efficiency of scum. When the scraper 250 contacts the scum collection ramp, the elastic element is compressed, which can further support the scraper 250 and improve the sealing of the scraping.

[0072] In some embodiments, in order to achieve unattended and highly automated operation of the equipment, based on the above embodiments, the control terminal 600 includes a core control cabinet comprising a programmable logic controller (PLC) module and a touch screen human-machine interface.

[0073] Meanwhile, an air flotation inlet flow meter is added to the inlet pipe 140, and a dosing pump driven by a frequency converter is also equipped at the front end of the system. The input terminals of the PLC module are respectively connected to the air flotation inlet flow meter, the gas flow meter 513, and various liquid level sensors; its output terminals are connected to the frequency converter of the dosing pump, the first motor 210, the second motor 310, and the pressure reducing valve 512.

[0074] Operators set target parameters, such as the dosage ratio and target liquid level, via a touchscreen and issue a start command. The system automatically starts the inlet water pump, and wastewater enters the tank through inlet pipe 140. During operation, the air flotation inlet flow meter collects and transmits the current instantaneous inlet flow data to the PLC module in real time. The PLC module calculates the optimal dosage of the chemical in real time based on a preset dosing ratio algorithm and simultaneously outputs an analog control signal to adjust the output frequency of the dosing pump inverter. When the instantaneous inlet flow increases, the PLC automatically increases the frequency of the dosing pump inverter, resulting in a proportional increase in the dosage; when the inlet flow decreases, the inverter frequency decreases accordingly, and the dosage automatically decreases.

[0075] While achieving optimal flocculation through precise dosing, the PLC module simultaneously controls the dissolved air mechanism 500 to release bubbles, and automatically adjusts the operating frequency of the first sludge scraper motor 210 and the second sludge discharge motor 310 based on the water inflow and liquid level sensor data. Finally, the treated clean water is automatically and continuously discharged from the outlet pipe 130.

[0076] Traditional constant dosing methods are prone to "excessive waste of chemicals" or "insufficient chemicals leading to flocculation failure and substandard effluent" when water flow fluctuates. This invention achieves real-time and precise matching of chemical dosage with raw water load, maximizing cost savings while ensuring water quality meets standards.

[0077] The implementation principle of a high-efficiency dissolved air flotation wastewater treatment device according to the present invention is as follows: This device achieves efficient and thorough slag collection by combining a magnetic structure with an elastic membrane 290. The magnetic structure ensures a near-seamless rigid fit between the bottom of the scraper 250 and the slag collection ramp 120, achieving a sealed cleaning of the slag on the ramp. Simultaneously, the elastic membrane 290 not only fills the mechanical gaps between adjacent scrapers 250, transforming the intermittent scraping process into a complete closed slag collection net, but also gives the scraper 250 the ability to adaptively adjust its contact angle, effectively overcoming the drawback of traditional single-piece scrapers 250 being prone to poor contact. This significantly improves the purity of the slag and the overall collection efficiency of the slag collection box 110.

[0078] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A high-efficiency dissolved air flotation wastewater treatment device, characterized in that: The system includes a housing (100), a sludge scraping mechanism (200), a sludge discharge mechanism (300), a water outlet pipe (130), and a water inlet pipe (140). The sludge scraping mechanism (200) includes a first motor (210), a transmission chain (220), transmission wheels (230), a mounting base (240), and a scraper (250). Multiple transmission wheels (230) are rotatably mounted on the housing (100), and a transmission rod (260) is fixedly mounted between two opposing transmission wheels (230). The first motor (210) is fixedly mounted on the upper end of the housing (100). The output shaft is connected to one of the transmission wheels (230) for transmission. The transmission chain (220) is sleeved on the transmission wheel (230). Multiple mounting seats (240) are fixedly installed on the transmission chain (220). Each end of the mounting seat (240) is fixedly connected to one of the transmission chains (220). The scraper (250) is fixedly installed on the mounting seat (240). A slag collection box (110) is fixedly installed at one end of the housing (100) near the first motor (210). A slag collection ramp (120) is fixedly installed on one side of the slag collection box (110). The sludge discharge mechanism (300) includes a second motor (310), a sludge discharge trough (320), a sludge discharge rod (330), and a sludge discharge plate (340). The sludge discharge trough (320) is fixedly installed at the bottom of the housing (100), and the bottom of the housing (100) is tapered. The sludge discharge rod (330) is rotatably installed in the sludge discharge trough (320). The second motor (310) is fixedly installed on the housing (100), and the output shaft of the second motor (310) is connected to the sludge discharge rod (330) for transmission. The sludge discharge plate (340) is fixedly installed on the sludge discharge rod (330) in a spiral shape to form a spiral propulsion structure. A sludge discharge pipe (350) is fixedly connected to one end of the sludge discharge trough (320). The water inlet pipe (140) is fixedly installed at the lower end of the housing (100), the water inlet pipe (140) is located below the first motor (210), and the water outlet pipe (130) is installed at the end of the housing (100) away from the water inlet pipe (140); The housing (100) is equipped with a dissolved air mechanism (500) for releasing dissolved air water.

2. The high-efficiency dissolved air flotation wastewater treatment equipment according to claim 1, characterized in that: A flow regulating mechanism (400) is also fixedly installed inside the housing (100). The flow regulating mechanism (400) includes a baffle (410), a bottom plate (420), an adjusting plate (441), and an intermediate plate (442). The baffle (410) is fixedly installed inside the housing (100). The bottom plate (420) is fixedly installed at the lower end between the baffle (410) and the side wall of the housing (100). The bottom end of the intermediate plate (442) is fixedly connected to the bottom plate (420). The side ends of the intermediate plate (442) are fixedly connected to the housing (100) and the baffle (410), respectively. An overflow port (460) is provided at the upper end. A guide plate (443) is fixedly installed on the intermediate plate (442). An adjusting plate (441) is slidably installed between the guide plate (443) and the intermediate plate (442). An adjusting rod (444) is fixedly installed at the top of the adjusting plate (441). The baffle (410) divides the inside of the box (100) into a contact separation area (150) and a clear water area (160). The other end of the clear water area (160) relative to the intermediate plate (442) is a water outlet area (170). The water outlet area (170) is connected to the water outlet pipe (130) on the box (100).

3. The high-efficiency dissolved air flotation wastewater treatment equipment according to claim 2, characterized in that: A bracket (470) is also fixedly installed between the baffle (410) and the box (100). An adjusting seat (480) is rotatably installed on the bracket (470). The adjusting rod (444) is a screw rod. The adjusting rod (444) is threadedly connected to the adjusting seat (480). An adjusting handle (490) is fixedly installed on the upper end of the adjusting seat (480).

4. The high-efficiency dissolved air flotation wastewater treatment equipment according to claim 1, characterized in that: The dissolved gas mechanism (500) includes an air inlet device (510), a dissolved gas pump (520), a dissolved gas water inlet pipe (530), a dissolved gas water outlet pipe (540), and a dissolved gas tank (550). The air inlet device (510) is installed on the housing (100). The air supply end of the air inlet device (510) is connected to the air inlet end of the dissolved gas tank (550). The water inlet end of the dissolved gas pump (520) is connected to the dissolved gas water inlet pipe (530). The water outlet end of the dissolved gas pump (520) is connected to the dissolved gas water outlet pipe (540). The bottom end of the dissolved gas tank (550) is connected to a dissolved gas release device (560). The dissolved gas release device (560) is located in the contact separation area (150) inside the housing (100).

5. The high-efficiency dissolved air flotation wastewater treatment equipment according to claim 4, characterized in that: The dissolved gas mechanism (500) also includes a water distribution tank (570) and a connecting pipe (580). One end of the water distribution tank (570) is connected to the dissolved gas outlet pipe (540). Multiple connecting pipes (580) are evenly distributed on the water distribution tank (570). The other end of the connecting pipe (580) extends into the box body (100) and is connected to the dissolved gas release device (560). Multiple dissolved gas release devices (560) are correspondingly provided. A regulating valve (590) is installed on the connecting pipe (580).

6. The high-efficiency dissolved air flotation wastewater treatment equipment according to claim 5, characterized in that: The dissolved gas release device (560) includes a large-diameter pipe (561) and a small-diameter pipe (562). The large-diameter pipe (561) is axially parallel inside the housing (100). The outlet end of the small-diameter pipe (562) is connected to the large-diameter pipe (561). The outlet end of the small-diameter pipe (562) is tangent to the outer edge of the large-diameter pipe (561). The inlet end of the small-diameter pipe (562) is connected to the connecting pipe (580).

7. The high-efficiency dissolved air flotation wastewater treatment equipment according to claim 6, characterized in that: The large-diameter pipe (561) has a spiral guide groove (563) inside, and the spiral direction of the spiral guide groove (563) is opposite to that of the two sides of the small-diameter pipe (562).

8. The wastewater treatment equipment for high-efficiency dissolved air flotation according to any one of claims 1 to 7, characterized in that: A strong magnet (270) is fixedly installed at the lower end of the slag collection ramp (120). A rotating shaft (280) is rotatably installed on the mounting base (240). The scraper (250) is rotatably installed on the rotating shaft (280). The scraper (250) close to the slag collection ramp (120) is attracted to the inclined surface of the slag collection ramp (120) by the strong magnet (270).

9. The high-efficiency dissolved air flotation wastewater treatment equipment according to claim 8, characterized in that: The slag scraping mechanism (200) also includes an elastic membrane (290), and a plurality of scrapers (250) are rotatably mounted on the rotating shaft (280). Two adjacent scrapers (250) are fixedly connected to each other through the elastic membrane (290), and the bottom end of the elastic membrane (290) abuts against the inclined surface of the slag collecting ramp (120).

10. The high-efficiency dissolved air flotation wastewater treatment equipment according to claim 4, characterized in that: The air intake device (510) includes an air intake pipe (511), a pressure reducing valve (512), and a gas flow meter (513). One end of the air intake pipe (511) is connected to a gas source, and the other end is connected to the air intake end of the dissolved gas tank (550). The pressure reducing valve (512) and the gas flow meter (513) are installed on the air intake pipe (511). A control terminal (600) is also installed on the housing (100). The control terminal (600) is electrically connected to the first motor (210), the second motor (310), the gas flow meter (513), and the pressure reducing valve (512).

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