A dosing aeration system for sewage treatment plants

Abstract

The application discloses a sewage treatment plant dosing aeration system, which comprises a sewage treatment tank, an A dosing pump and a B dosing pump. A plurality of undulating aeration units are arranged in a rectangular array in the sewage treatment tank. The outlet end of the A dosing pump extends to the sewage treatment tank through a plurality of shunt pipes, forming a plurality of A dosing points. The outlet end of the B dosing pump extends to the sewage treatment tank through a plurality of shunt pipes, forming a plurality of B dosing points. The plurality of A dosing points and the plurality of B dosing points are discretely and uniformly distributed above the sewage treatment tank, and the geometric center in the rectangular enclosed range of any adjacent four undulating aeration units distributed in a rectangular manner in the sewage treatment tank is provided with an A dosing point or a B dosing point. Each undulating aeration unit can excite a gradually expanding pool bottom annular dark wave outward around the water body on the basis of aeration, so that aeration oxygenation and dosing hydraulic mixing are realized.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment systems. Background Technology

[0002] In urban sewage and industrial wastewater treatment plants, chemical agents are often added to biological treatment tanks or aeration tanks to improve phosphorus removal, nitrogen removal, or coagulation effects. Existing dosing methods mostly involve directly injecting the agents at several points through fixed pipelines, relying on the existing flow patterns within the tank, aeration disturbances, or independent mechanical stirring to achieve mixing.

[0003] However, the complex flow field inside the tank, with dead water zones, short-circuiting and stratification, makes it easy for the reagent to form a high concentration zone near the dosing point and sink directly to the bottom of the tank, or to flow out with the water flow without fully reacting. This results in low effective utilization of the reagent, large fluctuations in the quality of the treated water, and waste and secondary pollution risks due to excessive dosing. Summary of the Invention

[0004] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides a chemical dosing and aeration system for sewage treatment plants, which realizes the synergistic effect of aeration and oxygenation and chemical dosing hydraulic mixing.

[0005] Technical Solution: To achieve the above objectives, the present invention provides a wastewater treatment plant dosing and aeration system, comprising a wastewater treatment tank, an A dosing pump, and a B dosing pump; a plurality of wave-type aeration units are arranged in a rectangular array within the wastewater treatment tank; the outlet end of the A dosing pump extends to the wastewater treatment tank through a plurality of branch pipes, forming a plurality of A dosing points; the outlet end of the B dosing pump extends to the wastewater treatment tank through a plurality of branch pipes, forming a plurality of B dosing points; the plurality of A dosing points and the plurality of B dosing points are discretely and uniformly distributed above the wastewater treatment tank, and an A dosing point or a B dosing point is set at the geometric center of the rectangular enclosure of any four adjacent rectangularly distributed wave-type aeration units within the wastewater treatment tank; each wave-type aeration unit can, on the basis of aeration, generate a ring-shaped dark wave at the bottom of the tank that gradually expands outward in a ring shape around itself.

[0006] Furthermore, both dosing pump A and dosing pump B are variable frequency liquid pumps controlled by a PLC; it also includes several water quality line monitors, with the sampling end of each monitor extending into the sewage treatment tank and the outlet of the sewage treatment tank.

[0007] Furthermore, the bottom of the wastewater treatment tank is equipped with an air supply network, which also includes a gas supply device for supplying oxygen and pressure to the air supply network; the air supply network supplies air to each wave aeration unit through several air supply pipes.

[0008] Furthermore, each gas supply pipe is equipped with a solenoid valve.

[0009] Furthermore, the wave-type aeration unit includes a bowl-shaped aeration seat fixed to the bottom of the sewage treatment tank. The upper end of the bowl-shaped aeration seat has an integral flange outer edge along its outer contour edge. It also includes a flange ring that is coaxially locked to the upper side of the flange outer edge by several flange bolts. It also includes an elastic aeration membrane. The circular contour edge of the elastic aeration membrane is sealed and clamped between the flange outer edge and the flange ring. The elastic aeration membrane has a group of aeration micropores evenly and discretely distributed on it. An air bladder is formed between the elastic aeration membrane and the inner wall of the bowl-shaped aeration seat, and an air supply pipe is connected to the air bladder.

[0010] Furthermore, a convex-arc-shaped wavy cover is provided on the upper side of the elastic aeration membrane, and an annular cover edge is provided along the contour of the outer edge of the wavy cover. Under the action of gravity, the flange ring supports upward and contacts the annular cover edge. Several guide posts are fixed on the upper side of the flange ring, and the guide posts move through the guide holes on the annular cover edge. A limiting cap with an outer diameter larger than the guide hole is fixed on the upper end of the guide post. Several microbubble overflow holes are discretely distributed on the wavy cover. A microbubble enrichment chamber is formed between the wavy cover and the elastic aeration membrane. The lower end of the bowl-shaped aeration seat is supported by a support. A vertical electromagnet is fixedly installed on the seat; a permanent magnet mounting plate is fixedly installed coaxially at the axis of the elastic aeration diaphragm, and a vertical permanent magnet is fixedly installed on the permanent magnet mounting plate; the permanent magnet and the electromagnet are coaxially aligned, and when the electromagnet is energized in the positive direction, the permanent magnet and the electromagnet repel each other; the permanent magnet mounting plate is connected to the support at the axis of the bowl-shaped aeration seat by a conical spring; when the permanent magnet and the electromagnet are in contact with each other, the elastic aeration diaphragm is horizontal or concave, and the conical spring exerts a downward pulling force on the permanent magnet mounting plate.

[0011] Furthermore, the elastic aeration membrane is made of EPDM rubber or silicone rubber.

[0012] Conventional aeration process: During conventional aeration, the electromagnets of each wave aeration unit are in the open state; the gas supply device supplies oxygen or air at a preset pressure to the gas supply network; and the solenoid valves are controlled to open, and the electromagnets are briefly energized in the positive direction at the beginning of aeration.

[0013] Dosing phase: Start dosing pumps A and B to continuously supply chemicals to each dosing point A and each dosing point B; thereby continuously replenishing chemicals to the geometric center of the rectangular enclosure of any four adjacent rectangularly distributed wave aeration units in the sewage treatment tank.

[0014] At the same time, each wave-type aeration unit is synchronously controlled to perform the following periodic actions:

[0015] S1, synchronously close all solenoid valves until the permanent magnet descends to contact the electromagnet.

[0016] S2, immediately and synchronously open each solenoid valve and simultaneously energize each electromagnet.

[0017] The above-mentioned pattern of periodic cycles "S1" and "S2" causes each wave aeration unit to periodically and synchronously generate outwardly expanding annular dark waves in the surrounding water. Considering four adjacent rectangularly distributed wave aeration units as a group, the convergence point of the four annular dark waves generated synchronously by these units is precisely at the geometric center of the rectangular enclosure of the four wave aeration units. After colliding at the convergence point, the four annular dark waves form a vertical dark current perpendicular to the horizontal plane. This upward dark current surges out of the water surface and rapidly spreads outwards under gravity; this point happens to be the chemical replenishment point.

[0018] Beneficial Effects: This invention achieves synergistic aeration and chemical dosing through hydraulic mixing. Several specially designed wave-shaped aeration units are arranged in a rectangular array within the wastewater treatment tank. Each wave-shaped aeration unit, in addition to conventional microporous aeration functions, can also achieve a dramatic deformation of the elastic diaphragm from a horizontal or slightly concave state to a pulsed, rapid upward expansion through the periodic opening and closing of the air supply solenoid valve and the instantaneous energization of the solenoid valve. This, in turn, pushes the upper spherical wave-shaped cover to lift instantly, causing the annular edge of the wave-shaped cover to separate from the fixed flange ring and form an annular water wave opening. This ejects the pre-accumulated microbubble-rich water in the microbubble enrichment chamber outward in a horizontal annular jet shape, thereby generating annular dark waves expanding outward from the tank bottom around itself.

[0019] The dosing points are precisely positioned at the geometric center of the rectangular area enclosed by four adjacent undulating aeration units. When all the undulating aeration units are synchronously controlled by the PLC to perform the same periodic action, the four synchronous annular dark waves collide and converge at the dosing point. The horizontal momentum cancels each other out and is forcibly converted into a vertically upward surging dark current. This vertical dark current acts precisely on the newly added agent, rapidly carrying the agent from the bottom of the pool to the full water depth and spreading radially with the water surface, forming a rapid and uniform diffusion of the agent from point to surface, thus solving the problems of agent settling to the bottom and local accumulation.

[0020] In addition, the variable frequency dosing pump, online water quality monitor, and PLC centralized control system for each solenoid valve and electromagnet dynamically adjust the aeration intensity, annular dark wave frequency, and dosage based on real-time water quality feedback, so as to accurately match the hydraulic mixing disturbance with the chemical dosing and realize the full-process automated closed-loop precise control. Attached Figure Description

[0021] Figure 1 A schematic diagram of the control system for dosing pump A and dosing pump B;

[0022] Figure 2 This is a top view of the entire wastewater treatment tank.

[0023] Figure 3 This is a schematic diagram of a wave-type aeration unit during normal aeration. Detailed Implementation

[0024] The invention will now be further described with reference to the accompanying drawings.

[0025] like Figures 1 to 3 The wastewater treatment plant chemical dosing and aeration system shown includes a wastewater treatment tank 22, a dosing pump A, and a dosing pump B; several wave-type aeration units 19 are arranged in a rectangular array within the wastewater treatment tank 22.

[0026] The outlet of dosing pump A extends to wastewater treatment tank 22 through several branch pipes, forming several dosing points 20a;

[0027] The outlet of the B dosing pump extends to the sewage treatment tank 22 through several branch pipes, forming several B dosing points 20b;

[0028] Several A dosing points 20a and several B dosing points 20b are discretely and uniformly distributed above the sewage treatment tank 22. Each of the four adjacent rectangularly distributed wave-type aeration units 19 in the sewage treatment tank 22 has an A dosing point 20a or a B dosing point 20b set at the geometric center of the rectangular enclosure. Each wave-type aeration unit 19 can generate a ring-shaped dark wave at the bottom of the tank that gradually expands outward in a ring shape to the surrounding water body on the basis of aeration.

[0029] Both dosing pump A and dosing pump B are variable frequency liquid pumps controlled by a PLC. Based on the real-time feedback data from the water quality monitoring instrument, the PLC dynamically adjusts the output flow of dosing pump A and dosing pump B through the frequency converter, thereby achieving precise and on-demand dosing of chemicals and avoiding waste of chemicals and secondary pollution of water caused by overdosing.

[0030] It also includes several water quality line monitors, such as TP online monitors, with the sampling ends of each monitor extending into the wastewater treatment tank 22 and at the outlet of the wastewater treatment tank 22. These are used to monitor the water quality indicators at different points in the tank and the effluent in real time, and to transmit the monitoring data to the PLC in real time, forming a closed-loop dosing control system.

[0031] The bottom of the wastewater treatment tank 22 is equipped with an air supply network 21, which also includes a gas supply device for supplying oxygen and pressure to the air supply network 21. The gas supply device preferably uses a variable frequency blower, whose output pressure and flow rate are also centrally controlled by a PLC to adapt to the aeration intensity requirements under different working conditions. The air supply network 21 supplies air to each wave aeration unit 19 through several air supply pipes 12.

[0032] Each air supply pipe 12 is equipped with a solenoid valve 13. The on / off state and opening degree of the solenoid valve 13 are synchronously controlled by the PLC to realize independent or regional periodic pulse air supply to each wave aeration unit 19.

[0033] The wave-type aeration unit 19 includes a bowl-shaped aeration seat 32 fixed to the bottom of the sewage treatment tank 22. The upper end of the bowl-shaped aeration seat 32 is integrally provided with a flange outer edge 10 along the outer contour edge. It also includes a flange ring 8 which is coaxially locked to the upper side of the flange outer edge 10 by a number of flange bolts. It also includes an elastic aeration membrane 18. The circular contour edge 11 of the elastic aeration membrane 18 is sealed and clamped between the flange outer edge 10 and the flange ring 8. The clamping surfaces of the flange outer edge 10 and the flange ring 8 are provided with mutually cooperating annular concave and convex interlocking sealing patterns to improve the clamping and sealing reliability of the edge of the elastic aeration membrane 18 and prevent high-pressure gas from leaking from the edge.

[0034] The elastic aeration membrane 18 is made of EPDM rubber or silicone rubber. Aeration micropores are uniformly and discretely distributed on the elastic aeration membrane 18. The pore size of the aeration micropores ranges from 0.2 mm to 0.5 mm, and the micropores are distributed in a non-uniform gradient density on the membrane surface. The micropore distribution density near the center of the membrane is greater than that at the edge.

[0035] An air bladder chamber 17 is formed between the elastic aeration membrane 18 and the inner wall of the bowl-shaped aeration seat 32, and the air supply pipe 12 is connected to the air bladder chamber 17.

[0036] The upper side of the elastic aeration diaphragm 18 is provided with a convex arc surface facing upward. The outer edge of the convex cover 1 is provided with an annular cover edge 9 along the contour. Under the action of gravity, the flange ring 8 supports upward and contacts the annular cover edge 9. The convex cover 1 is an upward convex spherical thin-walled structure with uniform wall thickness of 2mm to 5mm. It is made of corrosion-resistant stainless steel sheet, which enables it to respond sensitively to changes in internal pressure and fluctuate.

[0037] Several guide posts 7 are fixed on the upper side of the flange ring 8. The guide posts 7 move through the guide holes on the annular cover edge 9. A limiting cap 6 with an outer diameter larger than the guide hole is fixed on the upper end of the guide post 7. The fit between the guide post 7 and the guide hole is a sliding fit, which ensures that the wave cover 1 can move smoothly up and down along the guide post 7, and effectively restricts its horizontal movement, ensuring that the annular cover edge 9 and the flange ring 8 can be accurately aligned and fitted each time they are reset.

[0038] The undulating cover 1 has a number of discretely distributed microbubble overflow holes 5; the diameter of the microbubble overflow holes 5 is 1mm to 2mm. A microbubble enrichment chamber 2 is formed between the undulating cover 1 and the elastic aeration membrane 18; a vertical electromagnet 15 is fixedly installed at the lower end of the bowl-shaped aeration seat 32 through a support 14; a permanent magnet mounting plate 4 is fixedly installed coaxially at the axis of the elastic aeration membrane 18, and a vertical permanent magnet 3 is fixedly installed on the permanent magnet mounting plate 4; the permanent magnet 3 and the electromagnet 15 are coaxially corresponding, and when the electromagnet 15 is energized in the positive direction, the permanent magnet 3 and the electromagnet 15 repel each other.

[0039] The permanent magnet mounting plate 4 is connected to the support 14 at the center of the bowl-shaped aeration seat 32 by a conical spring 16. The conical spring 16 is a truncated cone spiral compression spring made of corrosion-resistant stainless steel wire. When the permanent magnet 3 and the electromagnet 15 are in contact with each other, the elastic aeration diaphragm 18 is horizontal or concave, and the conical spring 16 exerts a downward pulling force on the permanent magnet mounting plate 4.

[0040] Conventional aeration process: During conventional aeration, the electromagnets 15 of each wave-type aeration unit 19 are in the open state; the gas supply device supplies oxygen or air at a preset pressure to the air supply network 21; the solenoid valves 13 are controlled to open, and the air supply pipe 12 continuously forms high-pressure gas in the air chamber 17. At the same time, in the initial stage of aeration, the electromagnets 15 can be briefly positively energized to facilitate smoother separation between the permanent magnet 3 and the electromagnet 15. This brief positive energization helps to overcome the initial static magnetic attraction between the permanent magnet and the electromagnet core, achieving reliable arching of the elastic aeration diaphragm 18 and preventing the aeration from failing to start normally due to adhesion after long-term shutdown; subsequently, the elastic aeration diaphragm 18 automatically expands upward under the internal pressure of the air chamber 17, thus making the elastic aeration diaphragm 18 convex arc-shaped, and the permanent magnet 3 moves upward with the elastic aeration diaphragm 18, such as... Figure 3 As shown, the conical spring 16 is stretched, accumulating elastic potential energy of tension. Subsequently, oxygen or air in the air chamber 17 is continuously released into the microbubble enrichment chamber 2 in the form of microbubble clusters through the aeration micropores on the elastic aeration membrane 18 under the influence of internal pressure. Then, the microbubble clusters enriched in the microbubble enrichment chamber 2 continuously overflow upwards and evenly into the bottom area of ​​the sewage treatment tank 22 through the discretely hollowed-out microbubble overflow holes 5 on the spherical thin-walled wave cover 1, thereby achieving the purpose of continuous aeration. During this process, under the action of its own gravity, the annular cover edge 9 of the wave cover 1 is always stationary on the flange ring 8, and the wave cover 1 remains stationary, so the system achieves stable microbubble aeration.

[0041] Dosing stage:

[0042] Start dosing pumps A and B to continuously supply chemicals at each dosing point 20a and each dosing point 20b; thereby continuously replenishing chemicals to the geometric center of the rectangular enclosure of any four adjacent rectangularly distributed wave aeration units 19 in the sewage treatment tank 22.

[0043] At the same time, each wave-type aeration unit 19 is synchronously controlled to perform the following periodic actions:

[0044] S1, simultaneously close all solenoid valves 13, causing the airbag chamber 17 to temporarily lose its gas supply. At this time, due to the combined action of external water pressure, its own downward restoring force, and the downward pulling force of the conical spring 16, the elastic aeration diaphragm 18 immediately begins to fluctuate downwards. Simultaneously, the remaining gas in the airbag chamber 17 continues to be released into the microbubble enrichment chamber 2 through the aeration micropores on the elastic aeration diaphragm 18 in the form of microbubble clusters, thus gradually reducing the volume of the airbag chamber 17 until the permanent magnet 3 descends to contact the electromagnet 15. The elastic aeration membrane 18 is horizontal or concave. At this time, the microbubble enrichment chamber 2 is in its maximum volume state, and the microbubble enrichment chamber 2 is filled with water containing microbubble clusters. In this step, the downward movement of the elastic aeration membrane 18 slowly squeezes the water in the microbubble enrichment chamber 2 through the microbubble overflow hole 5. At the same time, because the annular cover edge 9 of the undulating cover 1 is in contact with the flange ring 8, water will not enter from the bottom annular gap, so that the microbubble enrichment chamber 2 can accumulate water rich in high concentration of microbubbles, and reserve sufficient microbubble water medium for the pulse jet in the next step.

[0045] S2, simultaneously opening each solenoid valve 13 and energizing each electromagnet 15, causes the permanent magnet 3 to instantly move upward under the repulsive force of the electromagnet 15, thus causing the center of the elastic aeration membrane 18 to rapidly oscillate upward. At the same time, due to the opening of the solenoid valve 13, the air supply pipe 12 causes high-pressure gas to form inside the air chamber 17. Under the combined action of the internal pressure of the air chamber 17 and the upward displacement of the permanent magnet 3, the aeration membrane 18 rapidly expands upward in a pulse-like manner, causing the originally horizontal or concave elastic aeration membrane 18 to quickly transform into an upwardly convex arc shape. This causes the volume of the microbubble enrichment chamber 2 to rapidly decrease in a short period. During this rapid decrease, the microbubble overflow holes 5 on the oscillating cover 1 cannot quickly drain the water from the microbubble enrichment chamber 2, resulting in a rapid, pulse-like increase in the internal pressure of the microbubble enrichment chamber 2. Consequently, the oscillating cover 1 rapidly rises upward under the action of the pulse-like internal pressure within the microbubble enrichment chamber 2. The undulation causes the annular cover edge 9 to undulate upwards following the undulating cover 1 until it is limited by the limiting cap 6, thereby separating the annular cover edge 9 from the flange ring 8 to form a gap, and forming an annular water wave opening between the annular cover edge 9 and the flange ring 8; the water enriched with microbubbles in the microbubble enrichment chamber 2, whose volume shrinks in the form of pulses, is rapidly ejected in the form of pulses through the annular water wave opening formed between the annular cover edge 9 and the flange ring 8, forming an annular jet that expands rapidly outwards along the horizontal direction of the pool bottom. This annular jet carries a large number of microbubbles and has the characteristics of low density and high flow velocity. As a result, each undulating aeration unit 19, based on the release of microbubbles, generates an annular dark wave that gradually expands outwards in an annular shape around itself in the surrounding water. This annular dark wave is actually an underwater horizontal density flow wave driven by the annular pulse jet and propagating within the boundary layer of the pool bottom. Its wave expands outwards at an approximately uniform speed and carries a large number of microbubbles to distant locations.

[0046] The cycles "S1" and "S2" repeat periodically according to the above pattern. The cycle period of a single S1 plus S2 is controlled between 1 and 3 seconds. The PLC automatically optimizes and adjusts the cycle based on the dissolved oxygen concentration and hydraulic mixing state fed back by the water quality line monitor, so that the generation frequency of the annular dark waves matches the hydraulic disturbance intensity required for the diffusion of the reagent. This allows each wave aeration unit 19 to periodically and synchronously generate annular dark waves that gradually expand outward in a ring shape to the water body around it. Considering four wave aeration units 19 distributed in any adjacent rectangle as a combination, the intersection point of the four annular dark waves generated synchronously by the four adjacent rectangular wave aeration units 19 is exactly at the geometric center of the rectangular enclosure of the four wave aeration units 19. After the four annular dark waves collide at the intersection point, they form a vertical dark current perpendicular to the horizontal plane. The fluid dynamics mechanism is as follows: the four annular dark waves propagating in opposite directions in the horizontal direction undergo an inelastic collision at the geometric center, and their momentum in the horizontal direction cancels each other out. The water body is forced to flow vertically. The upward movement efficiently converts the horizontally propagating wave energy into vertically upward surging kinetic energy. Consequently, at the geometric center of the area enclosed by the four adjacent rectangular wave-type aeration units 19 in the wastewater treatment tank 22, a periodic upward undercurrent perpendicular to the horizontal plane is continuously formed. After surging upward to the water surface, this vertical undercurrent rapidly diffuses outward under the influence of gravity. This location happens to be the chemical replenishment point. The chemical replenished at the geometric center of the rectangular area enclosed by the four wave-type aeration units 19 is rapidly diffused outward from the replenishment point under the action of this vertical undercurrent, forming a point-to-surface chemical mixing and diffusion pattern. This allows the chemical to first rise rapidly from the bottom of the tank to the full water depth under the action of the vertical undercurrent, and then, with the help of radial diffusion at the water surface and the continuous horizontal stirring of the subsequent annular undercurrent, the chemical concentration throughout the entire tank is rapidly homogenized. This ensures that the added chemical diffuses more quickly and evenly into the wastewater treatment tank 22, avoiding sedimentation, accumulation, and uneven distribution.

[0047] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A chemical dosing and aeration system for a wastewater treatment plant, characterized in that: Includes a wastewater treatment tank (22), A dosing pump and B dosing pump; the wastewater treatment tank (22) has several wave-type aeration units (19) arranged in a rectangular array. The outlet of the A dosing pump extends to the sewage treatment tank (22) through several branch pipes, forming several A dosing points (20a). The outlet of the B dosing pump extends to the wastewater treatment tank (22) through several branch pipes, forming several B dosing points (20b). Several A dosing points (20a) and several B dosing points (20b) are discretely and uniformly distributed in the sewage treatment tank (22). Within the rectangular enclosure of any four adjacent rectangularly distributed wave-type aeration units (19) in the sewage treatment tank (22), there is an A dosing point (20a) or a B dosing point (20b) at the geometric center. Each wave-type aeration unit (19) can generate a ring-shaped dark wave at the bottom of the tank that gradually expands outward in a ring shape to the surrounding water body on the basis of aeration.

2. The wastewater treatment plant dosing and aeration system according to claim 1, characterized in that: Both dosing pump A and dosing pump B are variable frequency liquid pumps controlled by PLC; it also includes several water quality line monitors, the sampling end of each water quality line monitor extends into the sewage treatment tank (22) and the outlet of the sewage treatment tank (22).

3. The wastewater treatment plant dosing and aeration system according to claim 2, characterized in that: The bottom of the wastewater treatment tank (22) is provided with an air supply network (21), and also includes a gas supply device for supplying oxygen and pressure to the air supply network (21); the air supply network (21) supplies air to each wave aeration unit (19) through several air supply pipes (12).

4. The wastewater treatment plant dosing and aeration system according to claim 3, characterized in that: Each gas supply pipe (12) is equipped with a solenoid valve (13).

5. A wastewater treatment plant dosing and aeration system according to claim 3, characterized in that: The wave-type aeration unit (19) includes a bowl-shaped aeration seat (32) fixed to the bottom of the sewage treatment tank (22). The upper end of the bowl-shaped aeration seat (32) is integrally provided with a flange outer edge (10) along the outer contour edge. It also includes a flange ring (8) which is coaxially locked to the upper side of the flange outer edge (10) by several flange bolts. It also includes an elastic aeration membrane (18). The circular contour edge (11) of the elastic aeration membrane (18) is sealed and clamped between the flange outer edge (10) and the flange ring (8). A group of aeration micropores is evenly and discretely distributed on the elastic aeration membrane (18). An air bladder chamber (17) is formed between the elastic aeration membrane (18) and the inner wall of the bowl-shaped aeration seat (32). The air supply pipe (12) is connected to the air bladder chamber (17).

6. The wastewater treatment plant dosing and aeration system according to claim 5, characterized in that: The elastic aeration membrane (18) is provided with a convex arc surface facing upward on the upper side of the undulating cover (1). An annular cover edge (9) is provided along the contour of the outer edge of the undulating cover (1). Under the action of gravity, the flange ring (8) supports upward and contacts the annular cover edge (9). Several guide posts (7) are fixed on the upper side of the flange ring (8). The guide posts (7) move through the guide holes on the annular cover edge (9). A limiting cap (6) with an outer diameter larger than the guide hole is fixed on the upper end of the guide post (7). Several microbubble overflow holes (5) are discretely hollowed out on the undulating cover (1). A microbubble enrichment chamber (2) is formed between the undulating cover (1) and the elastic aeration membrane (18); a vertical electromagnet (15) is fixedly installed at the lower end of the bowl-shaped aeration seat (32) via a support (14); a permanent magnet mounting plate (4) is fixedly installed coaxially at the axis of the elastic aeration membrane (18), and a vertical permanent magnet (3) is fixedly installed on the permanent magnet mounting plate (4); the permanent magnet (3) and the electromagnet (15) are coaxially aligned, and when the electromagnet (15) is energized in the positive direction, the permanent magnet (3) and the electromagnet (15) repel each other; The permanent magnet mounting plate (4) is connected to the support (14) at the center of the bowl-shaped aeration seat (32) by a conical spring (16); when the permanent magnet (3) and the electromagnet (15) are in contact with each other, the elastic aeration diaphragm (18) is horizontal or concave, and the conical spring (16) exerts a downward pulling force on the permanent magnet mounting plate (4).

7. A wastewater treatment plant dosing and aeration system according to claim 5, characterized in that: The elastic aeration membrane (18) is made of EPDM rubber or silicone rubber.

8. The working method of a wastewater treatment plant dosing and aeration system according to claim 6, characterized in that: Conventional aeration process: During the conventional aeration process, the electromagnets (15) of each wave aeration unit (19) are all in the open state; the gas supply device supplies oxygen or air at a preset pressure to the gas supply network (21); controls each solenoid valve (13) to open, and controls the electromagnets (15) to be briefly positively energized at the beginning of the aeration stage. Dosing stage: Start dosing pump A and dosing pump B, so that each dosing point A (20a) and each dosing point B (20b) continuously discharges the agent; thereby continuously replenishing the geometric center of the rectangular enclosure of any adjacent rectangular distribution of four wave aeration units (19) in the sewage treatment tank (22) with the agent continuously added. At the same time, each wave-type aeration unit (19) is synchronously controlled to perform the following periodic actions: S1, synchronously close each solenoid valve (13) until the permanent magnet (3) descends to contact the electromagnet (15); S2, immediately and simultaneously open each solenoid valve (13) and energize each electromagnet (15); According to the above rules, the cycle "S1" and "S2" are repeated periodically; thus, each wave aeration unit (19) periodically and synchronously generates a ring-shaped dark wave that gradually expands outward in a ring shape to the water body around it; the four wave aeration units (19) distributed in any adjacent rectangle are regarded as a combination. The four annular dark waves generated synchronously by the four adjacent rectangularly distributed wave aeration units (19) converge at the geometric center of the rectangular enclosure of the four wave aeration units (19). After the four annular dark waves collide at the convergence point, they form a vertical dark current perpendicular to the horizontal plane. This vertical dark current surges upward out of the water surface and then spreads rapidly in all directions under the action of gravity. This point happens to be the chemical replenishment point.

Images