Fenton catalytic oxidation reactor for treating wastewater

Abstract

The application discloses a Fenton catalytic oxidation reactor for treating wastewater and relates to the technical field of wastewater treatment. The Fenton catalytic oxidation reactor comprises a tank body, a dosing pipe, a motor and a rotating shaft which are arranged above the tank body, a liquid inlet pipeline arranged in the tank body, a mixing mechanism arranged outside the rotating shaft, a liquid inlet mechanism arranged outside the liquid inlet pipeline, a channel arranged in the liquid inlet pipeline, a first filter plate arranged in the liquid inlet pipeline and a first outer ring arranged outside the first filter plate, and one end of the liquid inlet mechanism is provided with a moving pipeline, and the other end of the liquid inlet mechanism is provided with an external pipeline. The Fenton catalytic oxidation reactor for treating wastewater can improve the use efficiency of the equipment.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a Fenton catalytic oxidation reactor for treating wastewater. Background Technology

[0002] The Fenton catalytic oxidation reactor is an advanced oxidation device designed based on Fenton chemistry principles for treating recalcitrant organic matter in industrial wastewater. By precisely controlling the reaction conditions between ferrous ions and hydrogen peroxide within the reactor, it continuously and efficiently generates hydroxyl radicals with extremely strong oxidizing power. These radicals non-selectively and rapidly decompose recalcitrant organic pollutants in the wastewater into small, harmless molecules such as carbon dioxide and water. In practical applications, after the wastewater is introduced into the reactor, by optimizing parameters such as pH, reagent dosage ratio, and residence time, the system can achieve highly efficient purification of high-concentration, toxic, and harmful organic wastewater, significantly improving its biodegradability or enabling direct discharge into compliance with standards.

[0003] The invention patent with publication number CN112390455A discloses an enhanced Fenton oxidation wastewater treatment process, aiming to solve the problems of low atomic contact rate and contact surface area in traditional Fenton reactions; the Fenton reaction is to be more complete, thorough, and closer to the theoretical value. However, due to the use of a solid catalyst, impurities in the wastewater can easily clog the mesh plate on the outside of the solid catalyst, affecting the progress of the Fenton catalytic oxidation reaction. Summary of the Invention

[0004] To overcome the problem that impurities in wastewater can easily clog the mesh plates outside the solid catalyst, thus affecting the Fenton catalytic oxidation reaction, this invention provides a Fenton catalytic oxidation reactor for wastewater treatment, including a tank and further comprising: The dosing pipe, motor, and rotating shaft connected to the motor output are installed on the top of the tank. The liquid inlet pipe is installed inside the tank body; A mixing mechanism located outside the rotating shaft; The liquid inlet mechanism is located outside the liquid inlet pipe. The liquid inlet mechanism includes a limiting cylinder installed outside the liquid inlet pipe, a push rod installed outside the limiting cylinder, and a connector connected to the telescopic end of the push rod. A movable pipe is installed at one end of the connector, and an external pipe is installed at the other end of the connector. The push rod is used to drive the movable pipe to move inside the limiting cylinder.

[0005] Preferably, the liquid inlet mechanism further includes: A channel opened inside the liquid inlet pipe; A first filter plate installed inside the moving pipeline and a first outer ring installed outside the first filter plate; Telescopic rods are installed outside the first filter plate.

[0006] Preferably, the liquid inlet mechanism further includes: The second filter plate is located at the end of the telescopic rod away from the first filter plate. The second filter plate is slidably connected to the inside of the moving pipe. The telescopic rod is used to drive the second filter plate to move in the horizontal direction. The second outer ring is installed on the outside of the second filter plate; The spiral rod, located on the side of the second filter plate away from the telescopic rod, is used to suspend filamentous impurities. A fixed frame installed inside the limiting cylinder and a contact rod connected to the fixed frame are used to contact and push the second filter plate.

[0007] Preferably, the mixing mechanism includes: The first outer ring is fitted onto the outside of the rotating shaft; A limiting ring installed on the outside of the rotating shaft is used to limit the position of the first outer ring. The first central plate and the contact components are disposed inside the tank.

[0008] Preferably, the mixing mechanism includes: The support rod and the contact plate connected to the support rod are installed on the outside of the first outer ring. The contact plate is used to contact the inner wall of the tank. An external helix is ​​installed on the outside of the support rod; Rotating components located outside the shaft.

[0009] Preferably, the rotating assembly includes: An arc-shaped plate installed on the outside of the rotating shaft and a cavity opened inside the arc-shaped plate; The first and second through holes are located inside the chamber and are used to provide channels for the movement of wastewater.

[0010] Preferably, the contact assembly includes: The second central disk is installed inside the first central disk and is used to hold the solid catalyst. A through channel opened inside the first central panel.

[0011] Preferably, the contact assembly further includes: The first and second filter holes are located inside the first central plate; A sealing ring is installed inside the through groove, and the sealing ring is installed on the outside of the rotating shaft.

[0012] Preferably, the contact assembly further includes: The second outer ring is installed on the outside of the rotating shaft; A connecting rod and a connecting plate connected to the connecting rod are disposed outside the second outer ring. The connecting plate is used to scrape impurities in the first and second filter holes.

[0013] This invention provides a Fenton catalytic oxidation reactor for treating wastewater. It has the following beneficial effects: 1. This wastewater treatment uses a Fenton catalytic oxidation reactor. By incorporating a liquid inlet mechanism, particulate impurities in the wastewater are intercepted before it enters the tank. In traditional equipment, due to the use of a solid catalyst, impurities in the wastewater easily clog the external mesh plates of the solid catalyst, affecting the Fenton catalytic oxidation reaction. Therefore, the liquid inlet mechanism, using a first filter plate, a second filter plate, and a screw rod, intercepts particulate matter and some filamentous impurities in the wastewater to solve the aforementioned problems.

[0014] 2. The wastewater treatment uses a Fenton catalytic oxidation reactor. By setting up a liquid inlet mechanism, a push rod drives the moving pipe to move, and the contact rod is controlled to repeatedly contact and push the second filter plate, thereby controlling the movement of the second filter plate and the screw rod. This promotes the shedding of impurities in the first and second filter plates. A first outer ring and a second outer ring are set outside the first and second filter plates. While promoting the contact and collision between the first and second filter plates, the second outer ring can drive the movement of impurities on the inner wall of the moving pipe.

[0015] 3. This wastewater treatment uses a Fenton catalytic oxidation reactor. Through the installation of a mixing mechanism and a rotating assembly, the rotating shaft drives the outer spiral, support rod, and contact plates to rotate, forming a combined axial and radial stirring. The contact plates, in contact with the inner wall of the tank, maintain structural stability while scraping away surface deposits, preventing solid catalyst buildup or blockage. Simultaneously, the four arc-shaped plates in the rotating assembly generate jets in the tank bottom area.

[0016] 4. The wastewater treatment uses a Fenton catalytic oxidation reactor. By setting up a mixing mechanism and contact components, the rotating shaft drives the second outer ring, connecting rod and connecting plate to rotate, so that the connecting plate contacts the upper and lower surfaces of the inner wall of the first central disk, thereby promoting the removal of a small amount of impurities accumulated in the first and second filter holes, allowing the liquid to pass through smoothly and react fully with the solid catalyst in the second central disk. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the tank body of the present invention; Figure 3 This is a schematic diagram of the liquid inlet mechanism of the present invention; Figure 4 This is a cross-sectional view of the liquid inlet mechanism of the present invention; Figure 5 For the present invention Figure 4 Schematic diagram of the structure at point A; Figure 6 This is a schematic diagram of the structure of the present invention; Figure 7 This is a schematic diagram of the structure of the mixing mechanism of the present invention; Figure 8 This is a cross-sectional view of the hybrid mechanism of the present invention; Figure 9 This is a schematic diagram of the rotating component of the present invention; Figure 10 This is a schematic diagram of the contact component of the present invention.

[0018] In the diagram: 1. Tank; 2. Motor; 3. Dosing pipe; 4. Liquid inlet mechanism; 401. Channel; 402. Limiting cylinder; 403. Moving pipe; 404. External pipe; 405. Push rod; 406. First filter plate; 407. First outer ring; 408. Telescopic rod; 409. Second filter plate; 410. Second outer ring; 411. Helical rod; 412. Connecting piece; 413. Fixing frame; 414. Contact rod; 5. Liquid inlet pipe; 6. Rotating shaft; 7. Mixing mechanism; 701. 702. First outer ring; 703. Limiting ring; 704. Support rod; 705. Contact plate; 706. Outer spiral; 707. First central disk; 708. Rotating assembly; 7071. Arc plate; 7072. First through hole; 7073. Chamber; 7074. Second through hole; 708. Contact assembly; 7081. First filter hole; 7082. Second filter hole; 7083. Second central disk; 7084. Sealing ring; 7085. Second outer ring; 7086. Connecting rod; 7087. Connecting plate. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0020] like Figures 1-10 As shown, the present invention provides a technical solution: a Fenton catalytic oxidation reactor for treating wastewater, as described below.

[0021] Including tank 1, it also includes: The dosing pipe 3, motor 2, and rotating shaft 6 connected to the output end of motor 2 are installed on the top of tank 1; The liquid inlet pipe 5 is installed inside the tank body 1; The mixing mechanism 7 is located outside the rotating shaft 6, and a solid catalyst is installed inside the mixing mechanism 7; The liquid inlet mechanism 4 is located outside the liquid inlet pipe 5. The liquid inlet mechanism 4 includes a limiting cylinder 402 installed outside the liquid inlet pipe 5, a push rod 405 located outside the limiting cylinder 402, and a connector 412 connected to the telescopic end of the push rod 405. A moving pipe 403 is installed at one end of the connector 412, and an external pipe 404 is installed at the other end of the connector 412. The push rod 405 is used to drive the moving pipe 403 to move inside the limiting cylinder 402. The push rod 405 is an electric push rod 405. The limiting cylinder 402 is installed inside the tank body 1.

[0022] Before using the equipment, workers transport wastewater through the inlet mechanism 4 to the inlet pipe 5. Ferrous sulfate and hydrogen peroxide are then added to the tank 1 through the dosing pipe 3. The inlet mechanism 4 is adjusted to intercept particulate impurities in the wastewater. The motor 2 is then started, driving the rotating shaft 6 and the mixing mechanism 7 to operate. During mixing, a Fenton catalytic oxidation reaction occurs between the ferrous sulfate, hydrogen peroxide, wastewater, and solid catalyst.

[0023] The liquid inlet mechanism 4 also includes: The channel 401 is opened inside the liquid inlet pipe 5. The channel 401 is opened on both sides of the liquid inlet pipe 5. Water is discharged from the side of the liquid inlet pipe 5, and the dosing pipe 3 is located on both sides above the liquid inlet pipe 5 to facilitate rapid mixing between liquids. A first filter plate 406 is installed inside the moving pipe 403 and a first outer ring 407 is installed outside the first filter plate 406. The first outer ring 407 is set in an annular shape and a mating interface is opened in the middle of the first filter plate 406. Telescopic rod 408 is installed outside the first filter plate 406; The second filter plate 409 is disposed at the end of the telescopic rod 408 away from the first filter plate 406, and the second filter plate 409 is slidably connected to the inside of the moving pipe 403; The second outer ring 410 is installed on the outside of the second filter plate 409, and the second outer ring 410 is configured to be annular in shape. The spiral rod 411 is located on the side of the second filter plate 409 away from the telescopic rod 408; The fixing bracket 413 and the contact rod 414 connected to the fixing bracket 413 are installed inside the limiting cylinder 402.

[0024] The process of feeding wastewater using the liquid inlet mechanism 4: When using the equipment, the worker injects wastewater into the external pipe 404. The wastewater enters the moving pipe 403 through the external pipe 404. After being filtered by the first filter plate 406 and the second filter plate 409, the wastewater enters the limiting cylinder 402 through the moving pipe 403, enters the liquid inlet pipe 5 through the limiting cylinder 402, and then moves outward to the tank 1 through the channel 401 of the liquid inlet pipe 5.

[0025] The process of using inlet pipe 5 to intercept particulate matter in wastewater: The push rod 405 is periodically adjusted to reciprocating motion mode, driving the connecting piece 412 and the moving pipe 403 to move horizontally. The moving pipe 403 begins to slide inside the limiting cylinder 402. During the movement of the moving pipe 403, the first filter plate 406, the telescopic rod 408, the second filter plate 409, and the screw rod 411 move accordingly. The contact rod 414 repeatedly contacts and pushes the second filter plate 409 through the interface of the first filter plate 406, causing the telescopic rod 408 to extend and retract accordingly, and the second filter plate 409 moves within the moving pipe 403. The second filter plate 409 repeatedly contacts the first outer ring 407, thereby transmitting vibration to the first filter plate 406, promoting the removal of impurities from both the first and second filter plates 406. Furthermore, the screw rod 411, located outside the second filter plate 409, facilitates the suspension of some filamentous impurities before filtration.

[0026] By setting up the liquid inlet mechanism 4, particulate impurities in the wastewater are intercepted and treated before entering the tank 1. In traditional equipment, due to the use of a solid catalyst, impurities in the wastewater easily clog the mesh plates outside the solid catalyst, affecting the Fenton catalytic oxidation reaction. Therefore, the liquid inlet mechanism 4 is set up, using the first filter plate 406, the second filter plate 409, and the screw rod 411 to intercept particulate matter and some filamentous impurities in the wastewater, thereby solving the above problems.

[0027] By setting up the liquid inlet mechanism 4, the push rod 405 drives the moving pipe 403 to move, and controls the contact rod 414 to repeatedly contact and push the second filter plate 409, thereby controlling the movement of the second filter plate 409 and the screw rod 411, thereby promoting the removal of impurities in the first filter plate 406 and the second filter plate 409. A first outer ring 407 and a second outer ring 410 are set on the outside of the first filter plate 406 and the second filter plate 409. While promoting the contact and collision between the first filter plate 406 and the second filter plate 409, the second outer ring 410 can drive the movement of impurities on the inner wall of the moving pipe 403.

[0028] Hybrid mechanism 7 includes: The first outer ring 701 is sleeved on the outside of the rotating shaft 6; The limiting ring 702 is installed on the outside of the rotating shaft 6; A first central disk 706 disposed inside the tank body 1 and a contact component 708 disposed inside the first central disk 706; A support rod 703 and a contact plate 704 connected to the support rod 703 are installed outside the first outer ring 701. An elastic gasket is provided at the connection between the support rod 703 and the contact plate 704. External spiral 705 is provided on the outside of support rod 703; Rotating component 707 is located outside the rotating shaft 6.

[0029] The working process of mixing liquids using mixing mechanism 7: The motor 2 is started, which drives the rotating shaft 6, the first outer ring 701, the support rod 703, the outer spiral 705, and the contact plate 704 to rotate. The contact plate 704 contacts the inner wall of the tank 1 to keep the support rod 703 and the outer spiral 705 in a horizontal position. This is used to mix the liquid.

[0030] Rotating assembly 707 includes: The arc-shaped plate 7071 installed on the outside of the rotating shaft 6 and the cavity 7073 opened inside the arc-shaped plate 7071 are provided in four. A first through hole 7072 and a second through hole 7074 are provided inside the chamber 7073. The first through hole 7072 is provided on the upper surface of the arc plate 7071, and the second through hole 7074 is provided on the side of the arc plate 7071.

[0031] The working process of mixing and treating wastewater using mixing mechanism 7 and rotating component 707: As the motor 2 starts, the motor 2 drives the rotating shaft 6 and the arc plate 7071 to rotate. The arc plate 7071 drives the wastewater in the lower part of the tank bottom to flow. Since the upper surface and side of the arc plate 7071 are provided with the first through hole 7072 and the second through hole 7074, both the first through hole 7072 and the second through hole 7074 are connected to the chamber 7073, so as to drive the wastewater entering the arc plate 7071 to move in the form of a jet.

[0032] By setting up a mixing mechanism 7 and a rotating assembly 707, the outer spiral 705, support rod 703, and contact plate 704 are driven to rotate by the rotating shaft 6, forming a composite stirring action in both the axial and radial directions. The contact plate 704, in contact with the inner wall of the tank 1, maintains structural stability while scraping away surface deposits, preventing the accumulation or blockage of solid catalyst. Simultaneously, the four arc-shaped plates 7071 in the rotating assembly 707 generate jets in the tank bottom region.

[0033] Contact component 708 includes: A second central disk 7083 is installed inside the first central disk 706, and a solid catalyst is disposed inside the second central disk 7083. A through channel is opened inside the first central panel 706; A first filter hole 7081 and a second filter hole 7082 are formed inside the first central plate 706; The sealing ring 7084 is installed inside the through groove, and the sealing ring 7084 is installed on the outside of the rotating shaft 6; The second outer ring 7085 is installed on the outside of the rotating shaft 6; A connecting rod 7086 and a connecting plate 7087 connected to the connecting rod 7086 are disposed outside the second outer ring 7085.

[0034] The reaction process is completed by using the mixing mechanism 7 in conjunction with the contact component 708: As the motor 2 starts, the rotating shaft 6 drives the second outer ring 7085, connecting rod 7086 and connecting plate 7087 to move. The connecting plate 7087 begins to rotate and contact the upper and lower surfaces inside the first central disk 706, promoting the removal of a small amount of impurities from the first filter hole 7081 and the second filter hole 7082 from the first central disk 706. During this process, the wastewater reacts with the solid catalyst inside the second central disk 7083.

[0035] By setting up a mixing mechanism 7 and a contact assembly 708, the rotating shaft 6 drives the second outer ring 7085, connecting rod 7086 and connecting plate 7087 to rotate, so that the connecting plate 7087 contacts the upper and lower surfaces of the inner wall of the first central disk 706, thereby promoting the removal of a small amount of impurities accumulated in the first filter hole 7081 and the second filter hole 7082, allowing the liquid to pass through smoothly and react fully with the solid catalyst in the second central disk 7083.

[0036] Working principle: Before using the equipment, the worker injects wastewater into the external pipe 404. The wastewater then enters the moving pipe 403 through the external pipe 404, then the limiting cylinder 402 through the moving pipe 403, then the inlet pipe 5 through the limiting cylinder 402, and finally moves outward through the channel 401 of the inlet pipe 5 into the tank 1. Ferrous sulfate and hydrogen peroxide are added to the tank 1 through the dosing pipe 3, and the ferrous sulfate, hydrogen peroxide, and wastewater begin to mix.

[0037] The push rod 405 is periodically adjusted to reciprocating motion mode, driving the connecting piece 412 and the moving pipe 403 to move horizontally. The moving pipe 403 begins to slide inside the limiting cylinder 402. During the movement of the moving pipe 403, the first filter plate 406, the telescopic rod 408, the second filter plate 409, and the screw rod 411 move accordingly. The contact rod 414 repeatedly contacts and pushes the second filter plate 409 through the interface of the first filter plate 406, causing the telescopic rod 408 to extend and retract accordingly, and the second filter plate 409 moves within the moving pipe 403. The second filter plate 409 repeatedly contacts the first outer ring 407, thereby transmitting vibration to the first filter plate 406, promoting the removal of impurities from both the first and second filter plates 406. Furthermore, the screw rod 411, located outside the second filter plate 409, facilitates the suspension of some filamentous impurities before filtration.

[0038] The motor 2 is started, which drives the rotating shaft 6, the first outer ring 701, the support rod 703, the outer spiral 705, and the contact plate 704 to rotate. The contact plate 704 contacts the inner wall of the tank 1 to keep the support rod 703 and the outer spiral 705 in a horizontal position. This is used to mix the liquid.

[0039] As the motor 2 starts, the motor 2 drives the rotating shaft 6 and the arc plate 7071 to rotate. The arc plate 7071 drives the wastewater in the lower part of the tank bottom to flow. Since the upper surface and side of the arc plate 7071 are provided with the first through hole 7072 and the second through hole 7074, both the first through hole 7072 and the second through hole 7074 are connected to the chamber 7073, so as to drive the wastewater entering the arc plate 7071 to move in the form of a jet.

[0040] As the motor 2 starts, the rotating shaft 6 drives the second outer ring 7085, connecting rod 7086 and connecting plate 7087 to move. The connecting plate 7087 begins to rotate and contact the upper and lower surfaces inside the first central disk 706, promoting the removal of a small amount of impurities from the first filter hole 7081 and the second filter hole 7082 from the first central disk 706. During this process, ferrous sulfate, hydrogen peroxide, wastewater and solid catalyst undergo Fenton catalytic oxidation reaction.

[0041] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A Fenton catalytic oxidation reactor for treating wastewater, comprising a tank (1), characterized in that, Also includes: The dosing pipe (3), motor (2), and rotating shaft (6) connected to the output end of the motor (2) are installed on the top of the tank (1). Liquid inlet pipe (5) installed inside the tank (1); A mixing mechanism (7) is located outside the rotating shaft (6); The liquid inlet mechanism (4) is located outside the liquid inlet pipe (5). The liquid inlet mechanism (4) includes a limiting cylinder (402) installed outside the liquid inlet pipe (5), a push rod (405) located outside the limiting cylinder (402), and a connector (412) connected to the telescopic end of the push rod (405). A moving pipe (403) is installed at one end of the connector (412), and an external pipe (404) is installed at the other end of the connector (412). The push rod (405) is used to drive the moving pipe (403) to move inside the limiting cylinder (402).

2. The Fenton catalytic oxidation reactor for wastewater treatment according to claim 1, characterized in that: The liquid inlet mechanism (4) further includes: A channel (401) is opened inside the liquid inlet pipe (5). A first filter plate (406) installed inside the moving pipe (403) and a first outer ring (407) installed outside the first filter plate (406); Telescopic rod (408) is installed outside the first filter plate (406).

3. The Fenton catalytic oxidation reactor for wastewater treatment according to claim 2, characterized in that: The liquid inlet mechanism (4) further includes: A second filter plate (409) is disposed at the end of the telescopic rod (408) away from the first filter plate (406), and the second filter plate (409) is slidably connected to the inside of the moving pipe (403); The second outer ring (410) is installed on the outside of the second filter plate (409); A screw rod (411) is installed on the side of the second filter plate (409) away from the telescopic rod (408). The fixing bracket (413) and the contact rod (414) connected to the fixing bracket (413) are installed inside the limiting cylinder (402).

4. The Fenton catalytic oxidation reactor for wastewater treatment according to claim 1, characterized in that: The hybrid mechanism (7) includes: The first outer ring (701) is sleeved on the outside of the rotating shaft (6); A limiting ring (702) installed on the outside of the rotating shaft (6); A first central disk (706) disposed inside the tank (1) and a contact assembly (708) disposed inside the first central disk (706).

5. The Fenton catalytic oxidation reactor for wastewater treatment according to claim 4, characterized in that: The hybrid mechanism (7) includes: A support rod (703) installed outside the first outer ring (701) and a contact plate (704) connected to the support rod (703); An external helix (705) is provided on the outside of the support rod (703); Rotating component (707) located outside the rotating shaft (6).

6. The Fenton catalytic oxidation reactor for wastewater treatment according to claim 5, characterized in that: The rotating assembly (707) includes: An arc-shaped plate (7071) installed outside the rotating shaft (6) and a cavity (7073) opened inside the arc-shaped plate (7071). A first through hole (7072) and a second through hole (7074) are opened inside the chamber (7073).

7. The Fenton catalytic oxidation reactor for wastewater treatment according to claim 4, characterized in that: The contact assembly (708) includes: The second center plate (7083) is installed inside the first center plate (706); A through channel is opened inside the first central plate (706).

8. The Fenton catalytic oxidation reactor for wastewater treatment according to claim 7, characterized in that: The contact assembly (708) further includes: The first filter hole (7081) and the second filter hole (7082) are opened inside the first central plate (706); A sealing ring (7084) is installed inside the through groove, and the sealing ring (7084) is installed on the outside of the rotating shaft (6).

9. The Fenton catalytic oxidation reactor for wastewater treatment according to claim 8, characterized in that: The contact assembly (708) further includes: The second outer ring (7085) is installed on the outside of the rotating shaft (6); A connecting rod (7086) located outside the second outer ring (7085) and a connecting plate (7087) connected to the connecting rod (7086).

Images