Sewage treatment device for micro-nano bubble enhanced air flotation separation

Abstract

The invention relates to the technical field of sewage treatment equipment, and provides a micro-nano bubble enhanced air flotation separation sewage treatment device which comprises a water purification tank and an annular coaming, and the annular coaming defines a rotational flow chamber located in the center in the water purification tank; an annular area between the annular coaming and the inner wall of the water purification tank is divided into a first treatment chamber and a second treatment chamber by the two partition plates; a plurality of dissolved air release heads; the vortex mechanism is used for forming a water flow vortex in the rotational flow chamber; the inlet end of the sewage pipe extends into the rotational flow chamber; the upper part of the first treatment chamber is communicated with a water inlet channel; the middle part of the second treatment chamber is communicated with a water purification pipe. The first treatment chamber is used for bearing main pollutant load and primary air flotation separation, and the second treatment chamber is used for carrying out deep purification; high-concentration scum in the first treatment chamber is effectively prevented from entering the second treatment chamber, and the purity and stability of final effluent discharged from the middle of the second treatment chamber through the water purification pipe are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment equipment, and in particular to a sewage treatment device with micro-nano bubble enhanced flotation separation. Background Art

[0002] In wastewater treatment, flotation technology is a widely used and effective method for solid-liquid separation, particularly suitable for removing suspended solids, oils, and colloids whose density is close to or less than that of water. Its core principle is to introduce a large number of tiny bubbles, generated by the release of dissolved air, into the water. These bubbles adhere to pollutant particles, forming a "bubble-particle" complex with an overall density less than that of water. These bubbles then float to the surface, forming a scum layer and ultimately separating the pollutants.

[0003] Traditional pressurized dissolved air flotation systems generally utilize a compartmentalized design. Typically, this design includes two main functional areas: a flotation chamber and a settling chamber (or separation chamber). Wastewater first enters the flotation chamber, where it mixes thoroughly with the fine bubbles generated by the dissolved air release system. Pollutants are captured by the bubbles and begin to float upward. The water then flows into the adjacent settling chamber. In the settling chamber, the water velocity decreases significantly, providing sufficient time and a stable environment for the bubble-pollutant flocs to complete the floatation process, ultimately accumulating to form a thick layer of scum on the water surface. A periodically operating mechanical scraper is installed above the settling chamber, slowly scraping the scum that accumulates on the water surface into a scum trough for discharge from the system.

[0004] However, this traditional flotation machine has a complex structure and large size due to the design of separate flotation chambers and static chambers, as well as the operating space reserved for the scraping device. This not only increases manufacturing costs, but also requires a long residence time in the static chamber, which relies on gravity for natural floating and static separation. The operation of the scraping device is intermittent, and the scraping process may disturb the water body, affecting the quality of the clean water below, and may cause some of the floating scum to sink back into the water, reducing the overall separation efficiency. In addition, the scraping device can usually only remove scum on its path, and has limited effect on removing corners or scattered scum. Its intermittent operation may cause the scum to accumulate too thickly before it is removed, affecting the treatment effect and equipment stability. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides a sewage treatment device with micro-nano bubble enhanced flotation separation, which overcomes the shortcomings of the existing technology, has a reasonable design and compact structure, and solves the problems of large volume and insufficient and thorough removal of scum.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] The present invention proposes a sewage treatment device with micro-nano bubble enhanced flotation separation, which is characterized by comprising:

[0008] clean water tank;

[0009] An annular enclosure plate is provided at the center of the inner bottom surface of the clean water tank, wherein the annular enclosure plate defines a central cyclone chamber inside the clean water tank;

[0010] Two partitions are respectively connected between the two sides of the outer wall of the annular enclosure and the inner wall of the clean water tank, dividing the annular area between the annular enclosure and the inner wall of the clean water tank into a first treatment chamber and a second treatment chamber;

[0011] A plurality of dissolved air release heads are respectively arranged at the bottom of the first treatment chamber and the second treatment chamber, and the dissolved air release heads are connected to an external dissolved air tank and are used to release micro-nano dissolved air bubbles in the first treatment chamber and the second treatment chamber;

[0012] a vortex mechanism, for forming a water vortex in the cyclone chamber;

[0013] A sewage pipe, the inlet end of which extends into the cyclone chamber, and the outlet end of which passes through the annular enclosure and the side wall of the clean water tank in sequence and extends to the outside;

[0014] The upper portion of the first treatment chamber is connected to a water inlet channel, and the middle portion of the second treatment chamber is connected to a water purification pipe.

[0015] Preferably, the vortex mechanism includes a disturbance ball arranged in the cyclone chamber, a driving member arranged below the outside of the clean water tank and directly below the cyclone chamber, and a magnetic block connected to the driving member and driven to rotate by the driving member;

[0016] The bottom wall of the clean water tank below the cyclone chamber is made of non-magnetic material;

[0017] The disturbance ball is magnetically attracted by the magnetic block and rotates synchronously.

[0018] Preferably, a bracket is fixed to the outside of the clean water tank;

[0019] The driving member includes a motor horizontally fixed on the bracket and a right-angle transmission gearbox connected to the output end of the motor, and the output shaft end of the right-angle transmission gearbox is fixedly connected to the crossbar;

[0020] One magnetic block is fixed at each end of the crossbar;

[0021] There are two disturbance balls, which are magnetically attracted by two magnetic blocks respectively.

[0022] Preferably, the vortex mechanism further comprises an annular ball track fixedly connected to the bottom of the cyclone chamber;

[0023] The annular ball track is composed of three annular limiting rings fixed to each other, and the annular limiting rings limit a track for accommodating the rotation of the disturbance ball.

[0024] Preferably, the two disturbance balls are fixedly connected by a connecting rod made of non-magnetic material.

[0025] Preferably, the clean water tank is a cylindrical structure.

[0026] Preferably, the inlet end of the sewage pipe extending into the cyclone chamber is located directly above the center axis of the annular ball track, and the inlet end is bent upward.

[0027] Preferably, the annular enclosure plate comprises a small cylindrical portion, a conical cylindrical portion and a large cylindrical portion sequentially connected from bottom to top;

[0028] The conical cylinder portion is a conical structure with a small bottom and a large top;

[0029] The height of the inlet end of the sewage pipe is slightly lower than the interface between the conical cylinder part and the large cylindrical part.

[0030] Preferably, the height of the upper edge of the large cylindrical portion is higher than the lowest point of the water inlet channel, but lower than the top of the clean water tank wall.

[0031] Preferably, a dissolved air main pipe and multiple dissolved air branch pipes nested inside and outside are provided below the clean water tank. The dissolved air branch pipes are connected to the dissolved air main pipe. Each dissolved air branch pipe has multiple dissolved air release heads distributed at intervals along the circumference; the dissolved air release heads extend upward and extend into the clean water tank.

[0032] The present invention provides a sewage treatment device with micro-nano bubble enhanced flotation separation. It has the following beneficial effects:

[0033] 1. The present invention uses an annular enclosure to divide the clean water tank into a central cyclone chamber and an outer annular first treatment chamber and a second treatment chamber, and uses partitions to partition them, which significantly simplifies the structure, greatly reduces the overall volume and floor space of the equipment, and reduces manufacturing costs and space requirements.

[0034] 2. The present invention utilizes a vortex mechanism to actively form a stable centripetal sinking water vortex in the cyclone chamber. The strong centripetal force and negative pressure effect on the water surface generated by the vortex can continuously and actively pull the scum layer formed on the water surface of the first treatment chamber and the second treatment chamber to the center of the vortex quickly and efficiently and gather it; the suction pump external to the sewage pipe can intermittently but efficiently suck the highly concentrated scum directly out of the system. The setting of the partition realizes physical partitioning, forcing the water flow to flow mainly from the upper layer of the first treatment chamber to the second treatment chamber. The first treatment chamber bears the main pollutant load and preliminary flotation separation, while the second treatment chamber performs deep purification. Combined with the strong suction effect of the cyclone on the scum, it effectively prevents the high concentration of scum in the first treatment chamber from entering the second treatment chamber, while ensuring that the small amount of pollutants entering the second treatment chamber can be quickly removed, thereby significantly improving the purity and stability of the final effluent discharged from the middle of the second treatment chamber through the clean water pipe.

[0035] 3. The vortex mechanism utilizes an external magnet driving an internal iron disturbance ball, with the magnetic force transmitted through the non-magnetic bottom of the water tank. This contactless transmission method completely eliminates the dynamic sealing challenges of rotating components, a common failure point in traditional mechanical agitation or scraping systems, significantly improving the system's sealing reliability and durability. The drive components, the motor and gearbox, are located outside the water tank in a dry environment for easy maintenance. The annular ball track, consisting of an annular retaining ring and connecting rod, ensures the stability and synchronization of the disturbance ball's operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the structure of the present invention;

[0037] Figure 2 for Figure 1 A partially cutaway schematic diagram of a three-dimensional structure;

[0038] Figure 3 It is a bottom view structural schematic diagram of the present invention;

[0039] Figure 4 for Figure 1 The front perspective drawing of

[0040] Figure 5 Schematic diagram of the structure of the annular ball track and the disturbance ball;

[0041] Figure 6 for Figure 3 A partial enlarged view of part A.

[0042] In the figure: 1. Clean water tank; 11. Cyclone chamber; 12. First treatment chamber; 13. Second treatment chamber; 14. Water inlet channel; 2. Annular enclosure; 21. Small cylindrical portion; 22. Conical cylindrical portion; 23. Large cylindrical portion; 3. Partition; 4. Dissolved air release head; 5. Vortex mechanism; 51. Disturbing ball; 52. Driving part; 521. Motor; 522. Right-angle transmission gearbox; 53. Magnetic block; 54. Cross bar; 55. Annular ball rail; 551. Annular limit ring; 56. Connecting rod; 6. Sewage pipe; 7. Clean water pipe; 8. Bracket; 9. Dissolved air main pipe; 10. Dissolved air branch pipe. DETAILED DESCRIPTION

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0044] Refer to the attached Figures 1-6 The present invention proposes a sewage treatment device with micro-nano bubble enhanced flotation separation, comprising a clean water tank 1, an annular enclosure 2 arranged in the center of the bottom surface of the clean water tank 1, and a bracket 8 fixed to the bracket 8 outside the clean water tank 1. The annular enclosure 2 defines a vortex chamber 11 located in the center inside the clean water tank 1. In addition, two partitions 3 are respectively connected between the two sides of the outer wall of the annular enclosure 2 and the inner wall of the clean water tank 1. The partitions 3 are preferably arranged radially. The two partitions 3 divide the annular area between the annular enclosure 2 and the inner wall of the clean water tank 1 into a first treatment chamber 12 and a second treatment chamber 13. The upper part of the first treatment chamber 12 is connected to a water inlet channel 14, and the middle part of the second treatment chamber 13 is connected to a clean water pipe 7. The water inlet channel 14 flows into the sewage, and the clean water pipe 7 pumps the treated clean water.

[0045] Below the clean water tank 1, a main air dissolution pipe 9 and multiple nested branch air dissolution pipes 10 are installed. These branch air dissolution pipes 10 are connected to the main air dissolution pipe 9. Each branch air dissolution pipe 10 is circumferentially spaced with multiple air release headers 4. These headers 4 extend upward and into the clean water tank 1. Saturated air-dissolved water supplied by an external air dissolution tank passes through the main air dissolution pipe 9 and the nested network of branch air dissolution pipes 10 at the bottom of the clean water tank 1. The evenly distributed air release headers 4 release a large number of micro- and nano-sized bubbles into the bottom areas of the first and second treatment chambers 12 and 13.

[0046] The system also includes a sewage pipe 6 for extracting wastewater containing scum. Its inlet extends into the cyclone chamber 11, and its outlet passes through the annular enclosure 2 and the sidewall of the clean water tank 1, extending to the exterior. The diameter of the sewage pipe 6 is 5-8 cm. Specifically, the inlet of the sewage pipe 6, which extends into the cyclone chamber 11, is located directly above the central axis of the annular ball track 55 and curves upward. The outlet of the sewage pipe 6 is connected to an external suction pump for intermittently pumping out wastewater containing floating impurities.

[0047] The present invention includes a vortex mechanism 5 for forming a water vortex in a vortex chamber 11; the vortex mechanism 5 includes a drive member 52 and a disturbance assembly. The drive member 52 is disposed below the exterior of the clean water tank 1 and directly below the vortex chamber 11. It includes a motor 521 horizontally fixed to a bracket 8, and a right-angle transmission gearbox 522 connected to the output end of the motor 521. The output shaft end of the right-angle transmission gearbox 522 is fixedly connected to a crossbar 54. A magnet 53 is fixed to each end of the crossbar 54. The magnet 53 is connected to the drive member 52 and driven to rotate by the drive member 52. The disturbance assembly includes a disturbance ball 51 disposed within the vortex chamber 11 and an annular ball track 55 fixedly connected to the bottom of the vortex chamber 11. The disturbance ball 51 rotates synchronously due to the magnetic attraction of the magnet 53. The bottom wall of the clean water tank 1 below the vortex chamber 11 is made of non-magnetic material, the magnet 53 is made of a strong magnet or a permanent magnet, and the disturbance ball 51 is an iron ball. Driven by magnetic force, the disturbance ball 51 rotates stably and synchronously along an annular ball track 55 fixed to the bottom of the cyclone chamber 11. The annular ball track 55 is composed of three mutually fixed annular retaining rings 551, which define a track for the disturbance ball 51 to rotate. The rotation of the disturbance ball 51 strongly disturbs the water in the cyclone chamber 11, forming a stable, centripetal, downward-sinking vortex.

[0048] The vortex mechanism 5 utilizes an external magnet 53 to drive an internal iron disturbance ball 51, with the magnetic force transmitted through the non-magnetic bottom wall of the water tank. This non-contact transmission method completely solves the problem of dynamic sealing of rotating components, a common failure point in traditional mechanical stirring or scraping devices, and significantly improves the sealing reliability and durability of the system. The drive components, motor 521 and gearbox, are located in a dry environment outside the water tank for easy maintenance. The annular ball track 55, consisting of an annular limit ring 551 and connecting rod 56, ensures the stability and synchronization of the operation of the disturbance ball 51.

[0049] In this embodiment, the number of disturbance balls 51 is preferably two and they are fixedly connected by a connecting rod 56 made of non-magnetic material. The two disturbance balls 51 are magnetically attracted by two magnetic blocks 53 respectively. The connection through the connecting rod 56 enables the two disturbance balls 51 to stably link and generate a vortex. Among them, the clean water tank 1 is configured as a cylindrical tube structure, which is conducive to the formation of a water vortex covering the water surface.

[0050] In this embodiment, the annular enclosure 2 comprises a small cylindrical portion 21, a conical portion 22, and a large cylindrical portion 23, connected sequentially from bottom to top. The conical portion 22 is tapered, narrower at the bottom and wider at the top, facilitating vortex formation. The inlet end of the sewage pipe 6 is located slightly below the interface between the conical portion 22 and the large cylindrical portion 23. The scum layer formed on the water surface of the first and second treatment chambers 12 and 13 is gradually drawn toward and gathered at the lowest point of the water surface in the center of the cyclone chamber 11 by the combined effects of the natural flow of the water and the centripetal force generated by the vortex. The inlet end of the sewage pipe 6 curves upward to near the interface between the conical portion 22 and the large cylindrical portion 23, precisely positioned at the sewage collection point. An external suction pump is used to intermittently and efficiently suction the pollutant-rich scum accumulated there through the sewage pipe 6 and out of the system.

[0051] The height of the upper edge of the large cylindrical portion 23 is higher than the lowest point of the water inlet channel 14, but lower than the top of the wall of the clean water tank 1, which effectively prevents sewage from directly entering the cyclone chamber 11, ensures cleaning efficiency, and prevents scum from entering the clean water pipe 7, while ensuring sufficient depth of the clean water layer.

[0052] Working principle: Sewage containing flocculants is first slowly discharged into the first treatment chamber 12 through the water inlet channel 14. Under the blocking effect of the partition 3, the sewage is mainly concentrated in this treatment chamber. At this time, the micro-nano bubbles generated by the dissolved air release head 4 adhere to the pollutants, causing them to float and form a scum layer on the surface of the water body. The motor 521 drives the magnetic block 53 to rotate. The magnetic force of the magnetic block 53 penetrates the wall of the clean water tank 1, driving the disturbance ball 51 to revolve stably along the annular ball track 55. The movement of the disturbance ball 51 forms a centripetal vortex in the cyclone chamber 11. This vortex causes the scum above the two-stage treatment chamber to gather towards the vortex center (i.e., the entrance of the sewage pipe 6) under the action of water flow. Among them, since the first treatment chamber 12 is in direct contact with the incoming water, the pollutant concentration is high and the amount of scum produced is large; after these scums float to the water surface, they are mainly gathered above the cyclone chamber 11 under the action of cyclone, and it is difficult for them to stay or enter the area above the second treatment chamber 13 in large quantities. Since the partition 3 not only blocks the direct flow of deep sewage into the second treatment chamber 13, but also forces the water flow to enter the second treatment chamber 13 from the upper layer, the initial water cleanliness of the second treatment chamber 13 is significantly higher than that of the first treatment chamber 12. A small amount of pollutants that enter the second treatment chamber 13 with the water flow will quickly be attached to the large number of micro-nano bubbles generated in the chamber and float up, so that the deep water body of the second treatment chamber 13 remains clean. The negative pressure effect generated by the vortex will efficiently suck in the scum gathered at the entrance of the sewage pipe 6. The suction pump pumps this scum out of the system through the sewage pipe 6. Ultimately, the purified clean water body mainly exists in the middle layer of the second treatment chamber 13 and is discharged through the clean water pipe 7.

[0053] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A sewage treatment device with micro-nano bubble enhanced flotation separation, characterized in that: include: clean water tank; An annular enclosure plate is provided at the center of the inner bottom surface of the clean water tank, wherein the annular enclosure plate defines a central cyclone chamber inside the clean water tank; Two partitions are respectively connected between the two sides of the outer wall of the annular enclosure and the inner wall of the clean water tank, dividing the annular area between the annular enclosure and the inner wall of the clean water tank into a first treatment chamber and a second treatment chamber; A plurality of dissolved air release heads are respectively arranged at the bottom of the first treatment chamber and the second treatment chamber, and the dissolved air release heads are connected to an external dissolved air tank and are used to release micro-nano dissolved air bubbles in the first treatment chamber and the second treatment chamber; a vortex mechanism, for forming a water vortex in the cyclone chamber; A sewage pipe, the inlet end of which extends into the cyclone chamber, and the outlet end of which passes through the annular enclosure and the side wall of the clean water tank in sequence and extends to the outside; The upper portion of the first treatment chamber is connected to a water inlet channel, and the middle portion of the second treatment chamber is connected to a water purification pipe.

2. The sewage treatment device with micro-nano bubble enhanced flotation separation according to claim 1, characterized in that: The vortex mechanism includes a disturbance ball arranged in the cyclone chamber, a driving member arranged below the outside of the clean water tank and directly below the cyclone chamber, and a magnetic block connected to the driving member and driven to rotate by the driving member; The bottom wall of the clean water tank below the cyclone chamber is made of non-magnetic material; The disturbance ball is magnetically attracted by the magnetic block and rotates synchronously.

3. The sewage treatment device with micro-nano bubble enhanced flotation separation according to claim 2, characterized in that: A bracket is fixed to the outside of the clean water tank; The driving member includes a motor horizontally fixed on the bracket and a right-angle transmission gearbox connected to the output end of the motor, and the output shaft end of the right-angle transmission gearbox is fixedly connected to the crossbar; One magnetic block is fixed at each end of the crossbar; There are two disturbance balls, which are magnetically attracted by two magnetic blocks respectively.

4. The sewage treatment device with micro-nano bubble enhanced flotation separation as claimed in claim 3, characterized in that: The vortex mechanism also includes an annular ball track fixedly connected to the bottom of the cyclone chamber; The annular ball track is composed of three annular limiting rings fixed to each other, and the annular limiting rings limit a track for accommodating the rotation of the disturbance ball.

5. The sewage treatment device with micro-nano bubble enhanced flotation separation as claimed in claim 3, characterized in that: The two disturbance balls are fixedly connected via a connecting rod made of non-magnetic material.

6. The sewage treatment device with micro-nano bubble enhanced flotation separation according to claim 1, characterized in that: The clean water tank is a cylindrical tube structure.

7. The sewage treatment device with micro-nano bubble enhanced flotation separation according to claim 1, characterized in that: The inlet end of the sewage pipe extending into the cyclone chamber is located directly above the central axis of the annular ball track, and the inlet end is bent upward.

8. A sewage treatment device with micro-nano bubble enhanced flotation separation as claimed in claim 1 or 7, characterized in that: The annular enclosure plate comprises a small cylindrical portion, a conical cylindrical portion and a large cylindrical portion which are sequentially connected from bottom to top; The conical cylinder portion is in a conical structure with a small bottom and a large top; The height of the inlet end of the sewage pipe is slightly lower than the interface between the conical cylinder part and the large cylindrical part.

9. The sewage treatment device with micro-nano bubble enhanced flotation separation as claimed in claim 8, characterized in that: The height of the upper edge of the large cylindrical portion is higher than the lowest point of the water inlet channel, but lower than the top of the clean water tank wall.

10. The sewage treatment device with micro-nano bubble enhanced flotation separation according to claim 1, characterized in that: A dissolved air main pipe and multiple dissolved air branch pipes nested inside and outside are provided below the clean water tank. The dissolved air branch pipes are connected to the dissolved air main pipe. Multiple dissolved air release heads are distributed circumferentially on each dissolved air branch pipe. The dissolved air release heads extend upward and into the clean water tank.

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