Multi-stage backflow slag discharge type sewage treatment equipment

Abstract

The application discloses a multi-section backflow slag discharge type sewage treatment equipment and belongs to the technical field of sewage treatment. The equipment specifically comprises a reverse connection tower and a cyclone tower which are connected in parallel and have a vertical structure. A spiral centering assembly and staggered distribution flow channels are arranged at the top of the reverse connection tower. A multi-stage wall flow inhibition system is constructed at the top of the reverse connection tower and is composed of the staggered distribution flow channels and the spiral centering assembly. Specifically, the left inclined corrugated holes of the upper filler layer and the right inclined corrugated holes of the lower filler layer are arranged in a spatial relationship that is opposite in inclination and 90 degrees to each other, so as to generate alternating transverse and tangential forces which are orthogonal in direction. The wall flow channels are broken before they fully develop. The vortex line disc is connected to the vortex line flow channels and the spiral line flow channels in a staggered manner, so as to form vortex-spiral line channels and realize guide flow control of radial centering and axial advancement. The forced interruption of the partition ring to the downward path of the wall surface and the axial pressure difference suction effect of the upper notch and the lower notch cooperatively form a multi-stage interception and resetting mechanism of the wall flow.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a multi-stage reflux slag discharge wastewater treatment equipment. Background Technology

[0002] Dissolved air flotation is one of the most widely used solid-liquid separation processes in the field of wastewater treatment. It is especially suitable for the separation of low-density suspended solids, emulsified oil and flocs in the deep treatment of oily wastewater, dyeing and printing wastewater, papermaking wastewater, catering wastewater and municipal sewage. The core principle is to dissolve air in water under pressure to form saturated dissolved air water, and then release micron-sized microbubbles through a release device. The microbubbles adhere to the suspended flocs in the water to form an air-floc composite with a density less than that of water. The composite floats to the liquid surface by buoyancy and is discharged by a scraping mechanism, thus achieving solid-liquid separation.

[0003] Currently, traditional air flotation contact chambers mostly adopt a single flow pattern design of co-current or counter-current flow. For example, an air flotation wastewater treatment device disclosed in patent publication number CN214570887U has the following overall water flow path during the treatment process: top inlet → counter-current section vertical flow from top to bottom → bottom connection port into vortex section → vortex section spiral flow from bottom to top → top rectification and then into co-current section → horizontal forward flow into separation zone.

[0004] However, when wastewater flows down through the high packing layer from the top, due to the surface tension of the liquid itself, the resistance difference between the packing wall and the internal pores, and the supporting effect of the rising airflow, the liquid will gradually exhibit "radial migration". Once it reaches the contact chamber wall, because the resistance of the chamber wall is much smaller than that inside the packing, the liquid film will accelerate rapidly and form a preferential channel. After the wall flow is formed, it will "siphon" the surrounding liquid, causing the packing in the central area to gradually dry out and lose its treatment capacity. Therefore, a solution is proposed. Summary of the Invention

[0005] The technical problem to be solved by this invention is that when water is introduced from the top, the wall flow phenomenon causes the central area of ​​the high packing layer to lose its treatment capacity. The purpose is to set up a multi-stage reflux slag discharge sewage treatment device to solve the above-mentioned technical problem.

[0006] The present invention provides the following device: a multi-stage reflux slag discharge type sewage treatment equipment, including a vertically connected reverse connection tower and a vortex tower, wherein the top of the reverse connection tower is provided with a stacked spiral centering component and an interleaved flow channel;

[0007] The staggered distribution channel includes an upper packing layer and a lower packing layer that are spaced apart at the top of the reverse connection tower and attached to the wall at the edge. The upper packing layer has left oblique corrugated holes and the lower packing layer has right oblique corrugated holes. The left oblique corrugated holes and the right oblique corrugated holes are inclined in opposite directions and are set at 90° to each other.

[0008] The spiral centering component includes a vortex disk located between the upper and lower packing layers. A vortex flow channel is formed along the vortex gap on the vortex disk, and a spiral flow channel is also formed through the vortex flow channel. The vortex flow channel and the spiral flow channel are intersected and connected to form a vortex-spiral channel. A spacer ring is installed on the outer side of the vortex disk to fit against the inner wall of the reverse connection tower. The spacer ring is used to fill the gap between the vortex disk and the inner wall of the reverse connection tower and does not have flow characteristics. A bevel is formed on the inner side of the upper end of the spacer ring to guide the water flow on the reverse connection tower wall back to the internal channel of the vortex disk.

[0009] The cyclone tower has a spiral flow channel attached to its inner wall. The bottom inlet of the spiral flow channel is tangentially connected to the bottom outlet of the reverse connection tower, and the top outlet of the cyclone tower and the top inlet of the reverse connection tower are connected by a circulation return channel.

[0010] Furthermore, a water distribution trough is installed on the top of the reverse connection tower, and an inlet pipe is symmetrically installed on one side of the water distribution trough. A water collection rail is installed on the inner side of the water distribution trough corresponding to the water inlet of the inlet pipe. The water collection rail is a guide structure that converges from both sides to the center. Wastewater injected by the inlet pipe flows along the water collection rail.

[0011] Furthermore, the upper and lower ends of the vortex disk are respectively provided with an upper notch and a lower notch. The arc length of the bottom cross section of the upper notch is greater than the arc length of the top cross section of the lower notch, and the upper and lower notches are connected vertically to the vortex-helix channel.

[0012] Furthermore, bottom aeration discs are evenly distributed at the bottom of the reverse connection tower, with the water outlet direction of the bottom aeration discs facing vertically upwards.

[0013] Furthermore, the helical flow channel penetrates the vortex disk along the helical path in the vertical plane, and the axial pitch of the helical flow channel and the radial spacing of the vortex flow channel satisfy the following condition: axial pitch ≥ radial spacing, so that the water flow in the vortex-helical channel is matched with at least one axial propulsion per revolution of vortex motion.

[0014] Furthermore, the bottom of the reverse connection tower is provided with a bottom connecting pipe with a full-width connecting structure, the bottom of the spiral flow channel is horizontally installed with a tangential interface structure that is connected to the bottom connecting pipe, and the upper end of the spiral flow channel is horizontally installed with a top connecting pipe.

[0015] Furthermore, dissolved gas release pipes are installed through the outside of the cyclone tower along the helical tangent of the helical flow channel, and the vertical spacing of the dissolved gas release pipes is the same as the pitch of the helical flow channel.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0017] 1. A multi-stage wall flow suppression system consisting of staggered flow channels and spiral centering components is constructed at the top of the reverse connection tower. Specifically, the left oblique corrugated holes of the upper packing layer and the right oblique corrugated holes of the lower packing layer generate alternating transverse tangential forces with orthogonal directions due to their opposite inclination and 90° spatial relationship. This interrupts the wall flow channels before they fully develop. The vortex disk, with its vortex flow channels and spiral flow channels intersecting and connecting to form a vortex-spiral channel, achieves radial centering and axial propulsion guidance control. The forced blocking of the downward path of the wall surface by the partition ring and the axial pressure difference suction effect of the upper and lower concave openings work together to form a multi-stage interception and reset mechanism for the wall flow.

[0018] 2. The uniform downward water flow formed by the multi-stage wall flow suppression system in the reverse connection tower is combined with the centrifugal separation area based on tangential inflow and spiral flow channel through the full-width connection structure of the bottom connecting pipe and the circulation return channel, so as to achieve stable countercurrent contact between the vertically rising bubble flow and the uniform downward water flow. Furthermore, the dissolved gas release pipes arranged along the same pitch along the spiral flow channel complete the vertically spaced multi-point release of dissolved gas water, ensuring the uniform replenishment of bubble concentration during the spiral ascent process. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a cross-sectional schematic diagram of the internal structure of the reverse connection tower of the present invention;

[0021] Figure 3 This is a schematic diagram of the mounting structure of the spiral disk of the present invention;

[0022] Figure 4 This is a schematic diagram of the upper notch of the spiral disk of the present invention;

[0023] Figure 5 This is a schematic diagram of the recessed opening of the spiral disk of the present invention;

[0024] Figure 6 This is a side sectional view of the reverse connection tower of the present invention;

[0025] Figure 7 This is a structural exploded view of the cyclone tower of the present invention;

[0026] Figure 8 This is a side sectional view of the cyclone tower of the present invention.

[0027] In the diagram: 1. Reverse connection tower; 2. Swirl tower; 3. Water distribution trough; 4. Inlet pipe; 5. Water collection baffle; 6. Upper packing layer; 7. Bottom connecting pipe; 8. Spiral flow channel; 9. Bottom aeration disc; 10. Spacing ring; 11. Lower packing layer; 12. Vortex disc; 13. Left oblique corrugated hole; 14. Right oblique corrugated hole; 15. Vortex flow channel; 16. Upper notch; 17. Lower notch; 18. Spiral flow channel; 19. Top connecting pipe; 20. Dissolved gas release pipe. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this invention are only used to explain this invention and are not intended to limit this invention.

[0029] In existing technologies, the contact chamber of dissolved air flotation equipment adopts a top-inlet water-contact structure with downward counter-current contact through the packing layer. The problems are as follows: Under the constraint of a limited tower cross-section, the packing layer needs to provide sufficient gas-liquid-solid three-phase contact area while maintaining a uniform water distribution to sustain the full cross-section's processing capacity. However, when the liquid flows downward through multiple layers of packing under gravity, the surface tension of the liquid, the difference in flow resistance between the packing wall and internal pores, and the upward support effect of the rising airflow inevitably cause radial migration of the water flow in the horizontal cross-section. Once the liquid reaches the inner wall of the tower at a certain location, the liquid film at that location will spontaneously accelerate and form a preferential flow channel because the flow resistance at the wall is much lower than the pore resistance inside the packing. Once this channel is formed, the increased local velocity will have a siphon effect on the surrounding liquid, causing the packing in the central area of ​​the tower to gradually lose liquid wetting and "dry up," ultimately reducing the effective utilization rate of the packing. Therefore, the following technical solution is proposed:

[0030] Example 1: Refer to Figure 1 - Figure 8 As shown, the multi-stage reflux slag discharge sewage treatment equipment includes a vertically connected reverse connection tower 1 and a vortex tower 2 connected in parallel. The top of the reverse connection tower 1 is equipped with a stacked spiral centering component and an interleaved flow channel.

[0031] The staggered distribution channel includes an upper packing layer 6 and a lower packing layer 11 spaced apart at the top of the reverse connection tower 1 and attached to the wall at the edge. The upper packing layer 6 is provided with a left oblique corrugated hole 13 and the lower packing layer 11 is provided with a right oblique corrugated hole 14. The left oblique corrugated hole 13 and the right oblique corrugated hole 14 are inclined oppositely and are arranged at 90° to each other.

[0032] It should be noted that the left oblique corrugated hole 13 on the upper packing layer 6 and the right oblique corrugated hole 14 on the lower packing layer 11 do not play a guiding role independently. Instead, they apply alternating, orthogonal lateral tangential forces to the downstream water flow through a spatial orthogonal relationship with opposite inclination directions and 90° to each other.

[0033] Specifically, when the water flows through the upper packing layer 6, the leftward tangential force causes it to migrate laterally to the left. Before this leftward migration reaches the wall, the water has already entered the lower packing layer 11. At this time, the rightward tangential force forces it to migrate back to the right. The vertical distance between the two packing layers is configured to be less than the minimum migration distance required for the full development of the wall flow, so that it is interrupted by the reverse force before the wall flow channel is formed, thus constituting the "cross-shear" guiding action.

[0034] The spiral centering assembly includes a vortex disk 12 located between the upper packing layer 6 and the lower packing layer 11. A vortex flow channel 15 is formed on the vortex disk 12 along the vortex gap, and a spiral flow channel 18 is also formed through the vortex flow channel 15. The vortex flow channel 15 and the spiral flow channel 18 are intersected and connected to form a vortex-spiral channel.

[0035] Reference Figure 6 As shown, a partition ring 10 is installed on the outer side of the vortex disk 12, which fits against the inner wall of the reverse connection tower 1. The partition ring 10 is used to fill the gap between the vortex disk 12 and the inner wall of the reverse connection tower 1 and does not have flow capability. The upper inner ring side of the partition ring 10 has a beveled edge for guiding the flow of water on the wall of the reverse connection tower 1. The spiral flow channel 18 penetrates the vortex disk 12 along the spiral path in the vertical plane, and the axial pitch of the spiral flow channel 18 and the radial distance of the vortex flow channel 15 satisfy the following: axial pitch ≥ radial distance, so that the water flow in the vortex-spiral channel matches at least one axial propulsion for each vortex motion.

[0036] The purpose of the vortex-spiral channel is that, in the intermediate section between passing through the upper packing layer 6 and entering the lower packing layer 11, the water flow enters the spiral centering region dominated by the vortex disk 12. The vortex channel 15 is opened along the vortex gap, and its geometric characteristics determine that when the water flows in it, it is constrained by the continuously changing radius of curvature, thereby generating centripetal acceleration. The radial component of this centripetal acceleration forces the water flow that diffuses along the wall to push towards the center of the disk. At the same time, the spiral channel 18 is set through the vortex channel 15 and intersects with the vortex channel 15 in space, providing axial spiral propulsion.

[0037] The synergistic effect of the two is as follows: the vortex channel 15 is responsible for "centering", bringing the radial position towards the center; the spiral channel 18 is responsible for "propulsion", ensuring that no local stagnation occurs during the centering process; the vortex-spiral channel formed by the two achieves the control of water flow for radial centering and axial propulsion. That is, the centering function and the propulsion function are carried by two different channel geometric dimensions respectively, without interfering with each other, avoiding the contradiction that "the stronger the centering, the greater the resistance" in the design of a single channel.

[0038] Reference Figure 4 - Figure 6 As shown, a third flow guiding effect is also provided, including an upper recess 16 and a lower recess 17 at the upper and lower ends of the vortex disk 12, respectively. The arc length of the bottom cross section of the upper recess 16 is greater than the arc length of the top cross section of the lower recess 17, and the upper recess 16 and the lower recess 17 are connected vertically to the vortex-spiral channel.

[0039] The geometric difference between the arc length of the bottom cross section of the upper concave opening 16 and the arc length of the top cross section of the lower concave opening 17 causes the water flow velocity to decrease and the static pressure to increase when the water flows into the channel through the upper concave opening 16, while the flow velocity increases and the static pressure decreases when the water flows out of the channel through the lower concave opening 17. A pressure gradient is formed between the upper and lower concave openings along the direction of water flow. This pressure gradient generates an axial suction force, which actively pulls the water flow in the central area downward to accelerate through, further weakening the driving force of the water flow to migrate towards the wall.

[0040] The partition ring 10 fills the gap between the vortex disk 12 and the inner wall of the reverse tower 1 and does not have flowability. The inclined side opened on the inner side of its upper end guides the water flow that has reached the wall back to the internal channel of the vortex disk 12 along the inclined side. The synergistic effect of the partition ring 10 is to cut off the continuity of the "preferred path" of downward flow from the wall. Even if the water flow fails to return to the center upstream and reaches the wall, the presence of the partition ring 10 prevents it from continuing to flow downward along the wall and it must re-enter the processing channel of the vortex disk 12, which is equivalent to setting up a multi-stage interception for the wall flow.

[0041] Reference Figure 2 As shown, bottom aeration discs 9 are evenly distributed at the bottom of the reverse connection tower 1. The water outlet direction of the bottom aeration discs 9 is vertically upward. The water flow after multi-stage centering treatment enters the air flotation reaction zone in the lower part of the reverse connection tower 1 in a uniformly distributed state. The bottom aeration discs 9 form countercurrent contact with the downward water flow. The key is that the rising bubble flow generated by the bottom aeration discs 9 and the uniform downward water flow after centering treatment form a stable and uniform countercurrent contact interface on the entire cross section of the reverse connection tower 1, avoiding bubble short-circuiting or local gas-liquid ratio imbalance caused by water flow deviation.

[0042] The cyclone tower 2 has a spiral channel 8 attached to its inner wall. The bottom water inlet of the spiral channel 8 is tangentially connected to the bottom water outlet of the reverse tower 1. The top water outlet of the cyclone tower 2 and the top water inlet of the reverse tower 1 are connected by a circulation reflux channel. After the mixed liquid spirals up to the top of the cyclone tower 2, it is discharged through the top connecting pipe 19. A portion of it returns to the top water inlet of the reverse tower 1 through the circulation reflux channel, forming a reflux cycle. The outside of the cyclone tower 2 is installed with dissolved gas release pipes 20 through the spiral tangent of the spiral channel 8. The vertical spacing of the dissolved gas release pipes 20 is the same as the pitch of the spiral channel 8.

[0043] During the spiral ascent, the dissolved gas release pipe 20 is installed outside the cyclone tower 2 along the spiral tangent of the spiral channel 8, and the vertical spacing of each dissolved gas release pipe 20 is the same as the pitch of the spiral channel 8. The effect of this configuration is that the release position of the dissolved gas release pipe 20 strictly corresponds to each turn of the spiral channel 8, ensuring that there are newly released microbubbles in the channel section for each rotation, thereby realizing multi-segment, equally spaced dissolved gas water injection in the entire spiral ascent path, avoiding the non-uniformity problem of bubble concentration decreasing along the path in the traditional single-point release method.

[0044] Example 2: Refer to Figure 1 and Figure 2 As shown, a water distribution trough 3 is installed on the top of the reverse connection tower 1. A water inlet pipe 4 is symmetrically installed on one side of the water distribution trough 3. A water collection rail 5 is installed on the inner side of the water inlet of the water distribution trough 3 corresponding to the water inlet of the water inlet pipe 4. The water collection rail 5 is a guide structure that converges from both sides to the middle. Wastewater injected into the water inlet pipe 4 flows along the water collection rail 5.

[0045] When the raw water to be treated is mixed with the circulating reflux liquid from the top outlet of the cyclone tower 2 in the water distribution tank 3 at the top of the reverse connection tower 1, the high-speed jet injected by the water inlet pipe 4 is uneven. To this end, the water collection bar 5 set inside the water distribution tank 3 uses its guiding structure that converges from both sides to the middle to force the water from both sides to converge in the middle, so as to eliminate the unevenness of the initial jet.

[0046] Reference Figure 1 , Figure 6 and Figure 7 As shown, the bottom of the reverse connection tower 1 is provided with a bottom connecting pipe 7 with a full-width interconnection structure. The bottom of the spiral flow channel 8 is horizontally installed with a tangential interface structure that is connected to the bottom connecting pipe 7. The top connecting pipe 19 is horizontally installed at the upper end of the spiral flow channel 8. The function of the bottom connecting pipe 7 with the full-width interconnection structure is to ensure that the water effluent from the full width section of the bottom of the reverse connection tower 1 can be uniformly introduced into the spiral flow channel 8, avoiding the dead zone of water accumulation at the bottom. The tangential interface structure horizontally installed at the bottom of the spiral flow channel 8 enables the mixed liquid to obtain a stable initial tangential momentum. This tangential momentum is transmitted from bottom to top along the spiral flow channel 8, maintaining the mixed liquid in a spiral upward motion within the spiral flow channel 8.

[0047] In addition, the gas-liquid flow in the reverse contact tower 1 is explained. The bottom aeration plate 9 generates an upward bubble flow, which moves in the opposite direction to the downward flow of water. This countercurrent contact mode requires that the downward water flow has a uniform velocity distribution across the entire cross section. Otherwise, the rising bubbles will preferentially escape along the high-speed water flow channel and will not be able to fully contact the water flow in the low-speed region.

[0048] In this invention, the staggered distribution channels and spiral centering components homogenize the downstream water flow, which provides the necessary prerequisite for the counter-current air flotation function of the bottom aeration disc 9. That is, without uniform water distribution, the efficiency of counter-current air flotation will be greatly reduced due to bubble short-circuiting. In other words, the homogenization function of the upper water distribution structure and the air flotation function of the bottom aeration disc constitute a necessary functional relationship, rather than a simple upstream and downstream series connection.

[0049] The direction of the outlet of the dissolved gas release pipe 20 needs to be further defined: the angle between the direction of the outlet of the dissolved gas release pipe 20 and the direction of the tangential velocity of the water flow in the spiral channel 8 is configured to be an acute angle so that the released dissolved gas water obtains the same tangential velocity component as the mainstream, so that it is drawn into the spiral flow field at the moment of release, avoiding turbulent dissipation caused by the velocity difference between the dissolved gas water and the mainstream.

[0050] Example 3: Refer to Figure 1 - Figure 8 As shown, this embodiment combines the technical content of Embodiment 1 and Embodiment 2 to form the following wastewater treatment method:

[0051] S1: Open the inlet pipe 4, the raw water enters the distribution tank 3, and after being gathered by the collection bar 5, it enters the reverse connection tower 1. Open the circulation return channel, and the return water mixes with the raw water at the inlet pipe 4 and enters the reverse connection tower 1.

[0052] S2: Under the action of gravity, the mixed liquid is guided by the left oblique corrugated hole 13 of the upper packing layer 6, the vortex-spiral channel of the vortex disk 12, and the right oblique corrugated hole 14 of the lower packing layer 11, completing the wall flow suppression and fluid homogenization process. During this process, the pressure difference between the top and bottom liquid surfaces of the reverse connection tower 1 is monitored. The stability of this pressure difference directly reflects whether there is a "drying" phenomenon caused by wall flow in the packing layer. That is, when wall flow occurs, the packing in the central area dries up, causing the airflow to short-circuit, and the pressure difference reading will fluctuate periodically.

[0053] S3: After homogenization, the water flow enters the bottom reaction zone of the reverse connection tower 1. The bottom aeration plate 9 releases bubbles and forms a countercurrent contact with the downward water flow. The bubbles and water flow collide and adhere. The bottom mixture of the reverse connection tower 1 enters the spiral channel 8 of the cyclone tower 2 tangentially through the bottom connecting pipe 7. Under the action of centrifugal force, it spirals upward. At the same time, the dissolved gas release pipe 20 releases dissolved gas water along the path at the same vertical spacing as the pitch of the spiral channel 8, realizing multi-stage uniform gas replenishment.

[0054] S4: Based on the liquid level and pressure difference in the reverse tower 1, slag is discharged periodically, and the bottom aeration and dissolved air pressure are controlled to complete the wastewater treatment.

[0055] Additional notes: The slag discharge device and reflux channel in this invention are mature technologies in the prior art, and will not be described in detail here. They are also not shown in the accompanying drawings. It can be understood that those skilled in the art can implement them without creative effort based on this invention.

[0056] In summary, this invention addresses the problem of "drying out" and failure of the central area of ​​the packing material in the contact chamber of traditional dissolved air flotation equipment due to wall flow phenomena.

[0057] On the one hand, a multi-stage wall flow suppression system consisting of staggered flow channels and spiral centering components is constructed at the top of the reverse connection tower 1. Specifically, the left oblique corrugated holes 13 of the upper packing layer 6 and the right oblique corrugated holes 14 of the lower packing layer 11 generate alternating transverse tangential forces with orthogonal directions in a spatial relationship of opposite inclination and 90° to each other, which interrupt the wall flow channel before it fully develops. The vortex disk 12, with its vortex flow channel 15 and spiral flow channel 18 intersecting and connected to form a vortex-spiral channel, realizes radial centering and axial propulsion flow control. The forced blocking of the downward path of the wall surface by the partition ring 10 and the axial pressure difference suction effect of the upper notch 16 and the lower notch 17 work together to form a multi-stage interception and reset mechanism for the wall flow.

[0058] On the other hand, the uniform downward water flow formed by the multi-stage wall flow suppression system in the reverse connection tower 1 is combined with the centrifugal separation area based on the tangential inflow and the spiral flow channel 8 through the full-width connection structure of the bottom connecting pipe 7 and the circulation return channel, so as to achieve stable countercurrent contact between the vertically rising bubble flow and the uniform downward water flow. Furthermore, the dissolved gas release pipes arranged along the spiral flow channel 8 with the same pitch complete the vertically spaced multi-point release of dissolved gas water, ensuring the uniform replenishment of bubble concentration during the spiral ascent process.

[0059] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A multi-stage reflux slag discharge type sewage treatment equipment, characterized in that, It includes a vertically connected reverse connection tower (1) and a vortex tower (2) with parallel structures. The top of the reverse connection tower (1) is provided with a stacked spiral centering component and an interleaved flow channel. The staggered distribution channel includes an upper packing layer (6) and a lower packing layer (11) spaced apart at the top of the reverse connection tower (1) and attached to the wall at the edge. The upper packing layer (6) is provided with a left oblique corrugated hole (13) and the lower packing layer (11) is provided with a right oblique corrugated hole (14). The left oblique corrugated hole (13) and the right oblique corrugated hole (14) are inclined in opposite directions and are arranged at 90° to each other. The spiral centering component includes a vortex disk (12) located between the upper packing layer (6) and the lower packing layer (11). A vortex flow channel (15) is provided on the vortex disk (12) along the vortex gap, and a spiral flow channel (18) is also provided through the vortex flow channel (15) of the vortex disk (12). The vortex flow channel (15) and the spiral flow channel (18) are intersected and connected to form a vortex-spiral channel. A partition ring (10) is installed on the outer side of the vortex disk (12) and fits against the inner wall of the reverse connection tower (1). The partition ring (10) is used to fill the gap between the vortex disk (12) and the inner wall of the reverse connection tower (1) and does not have flowability. A bevel is provided on the inner ring side of the upper end of the partition ring (10) to guide the water flow on the wall of the reverse connection tower (1) back to the internal channel of the vortex disk (12). The spiral flow channel (8) is installed inside the cyclone tower (2) and attached to the wall. The bottom water inlet of the spiral flow channel (8) is tangentially connected to the bottom water outlet of the reverse connection tower (1), and the top water outlet of the cyclone tower (2) and the top water inlet of the reverse connection tower (1) are provided with a circulation return channel.

2. The multi-stage reflux slag discharge type sewage treatment equipment according to claim 1, characterized in that, The top of the reverse connection tower (1) is equipped with a water distribution trough (3), and a water inlet pipe (4) is symmetrically installed on one side of the water distribution trough (3). A water collection rail (5) is installed on the inner side of the water inlet of the water distribution trough (3) corresponding to the water inlet of the water inlet pipe (4). The water collection rail (5) is a guide structure that converges from both sides to the middle. Wastewater injected by the water inlet pipe (4) flows along the water collection rail (5).

3. The multi-stage reflux slag discharge type sewage treatment equipment according to claim 1, characterized in that, The upper and lower ends of the vortex disk (12) are respectively provided with an upper recess (16) and a lower recess (17). The arc length of the bottom cross section of the upper recess (16) is greater than the arc length of the top cross section of the lower recess (17), and the upper recess (16) and the lower recess (17) are connected vertically to the vortex-helix channel.

4. The multi-stage reflux slag discharge type sewage treatment equipment according to claim 1, characterized in that, The bottom of the reverse connection tower (1) is evenly provided with bottom aeration discs (9), and the water outlet direction of the bottom aeration discs (9) is vertically upward.

5. The multi-stage reflux slag discharge type sewage treatment equipment according to claim 1, characterized in that, The spiral channel (18) passes through the vortex disk (12) along the spiral path in the vertical plane, and the axial pitch of the spiral channel (18) and the radial distance of the vortex channel (15) satisfy the following: axial pitch ≥ radial distance, so that the water flow in the vortex-spiral channel is matched with at least one axial propulsion for each vortex motion.

6. The multi-stage reflux slag discharge type sewage treatment equipment according to claim 1, characterized in that, The bottom of the reverse connection tower (1) is provided with a bottom connecting pipe (7) with a full-width connecting structure. The bottom of the spiral flow channel (8) is horizontally installed with a tangential interface structure with the bottom connecting pipe (7). The top connecting pipe (19) is horizontally installed at the top of the spiral flow channel (8).

7. The multi-stage reflux slag discharge type sewage treatment equipment according to claim 6, characterized in that, A dissolved gas release pipe (20) is installed through the outside of the cyclone tower (2) along the spiral tangent of the spiral channel (8), and the vertical spacing of the dissolved gas release pipe (20) is the same as the pitch of the spiral channel (8).

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