A subsurface flow wetland water purification device

Abstract

The present application provides a kind of subsurface flow wetland water quality purification device, it relates to sewage treatment technical field, including wetland bed body, the center of wetland bed body is separated and is installed cavity, the inboard of wetland bed body is separated and is distributed with several planting cavities in circle;The inboard of each planting cavity is provided with filler unit;The present application is driven by the intermittent component of water inlet unit by the multiple independent planting cavities of circle distribution in wetland bed body cooperation, so that each planting cavity is periodically alternated in water inlet anoxic stage and dry stage, water inlet stage, sewage fills the gap of filler unit, and dissolved oxygen is rapidly depleted to form anoxic / anaerobic environment, and carbon source is simultaneously added to provide electron donor for denitrifying bacteria, and the nitrate nitrogen accumulated in the last round is reduced to nitrogen gas;After dry stage, air enters filler gap after water is emptied, and anoxic environment is formed, and nitrifying bacteria oxidize ammonia nitrogen to nitrate nitrogen, while aerobic microorganisms degrade organic matter, which can improve the efficiency of removing organic matter, ammonia nitrogen and total nitrogen.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a subsurface flow wetland downflow water purification device. Background Technology

[0002] Subsurface flow constructed wetlands are widely used for the purification and treatment of domestic sewage, decentralized rural sewage, landscape water bodies, and industrial effluent due to their advantages such as stable treatment effect, low operating cost, and eco-friendliness. However, existing subsurface flow wetland technology still has the following shortcomings in practical applications:

[0003] Traditional subsurface flow wetlands typically employ continuous influent, making it difficult to establish a stable aerobic-anoxic alternating environment within the bed. This fails to meet the aerobic requirements of nitrifying bacteria and the anoxic / anaerobic requirements of denitrifying bacteria, thus limiting total nitrogen removal efficiency. Furthermore, during denitrification, carbon sources are the electron donors and energy sources for denitrifying bacteria. When the carbon-to-nitrogen ratio in wastewater is low, denitrifying bacteria lack sufficient carbon sources, leading to incomplete denitrification and significantly reduced nitrogen removal efficiency. However, existing carbon source addition methods are mostly continuous or rely on independent metering pumps and solenoid valves, making it difficult to synchronize with the influent process and easily resulting in carbon source waste. Therefore, it is necessary to provide a subsurface flow wetland downward flow water purification device to solve the above-mentioned technical problems. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a subsurface flow wetland downflow water purification device.

[0005] The present invention provides a subsurface flow wetland downflow water purification device, including a wetland bed, an installation cavity divided at the center of the wetland bed, a plurality of planting cavities distributed in a circular pattern on the inner side of the wetland bed, a water purification cavity disposed below the plurality of planting cavities on the inner side of the wetland bed, and a water outlet connected to the water purification cavity disposed on the lower part of one side of the wetland bed.

[0006] Each of the implantation cavities is provided with a packing unit on its inner side;

[0007] A water inlet unit is installed inside the mounting cavity, and a carbon source addition unit is installed on the water inlet unit;

[0008] The outlet end of the water inlet unit can rotate intermittently, and each time it stops rotating, it is aligned with one of the planting cavities and the wastewater is delivered to the packing unit inside the planting cavity.

[0009] The carbon source addition unit uses the rotation of the water inlet unit as power to automatically add carbon source to the water inlet of the corresponding implantation cavity.

[0010] Preferably, the water inlet unit includes a water inlet component and an intermittent drive component; the water inlet component includes a fixed frame, which is fixedly connected to the top of the wetland bed. A water inlet hopper is fixedly connected to the upper end of the fixed frame, and a rotary joint is fixedly connected to the bottom end of the water inlet hopper. A water inlet pipe is fixedly connected to the end of the rotary joint away from the water inlet hopper. A water receiving tray is fixedly connected to the fixed frame below the water inlet pipe. The inner side of the water receiving tray is divided into several partitioned water chambers that correspond one-to-one with the planting chambers and are distributed in a circular pattern. The water outlet end of the water inlet pipe is aligned with one of the partitioned water chambers directly below. Several water outlet pipes corresponding one-to-one with the partitioned water chambers are fixedly connected to the bottom of the water receiving tray. The water inlet end of the water outlet pipe is connected to the corresponding partitioned water chamber. A vertical rotating shaft is vertically rotatably connected through the center of the water receiving tray. The top end of the vertical rotating shaft is fixedly connected to the outer wall of the water inlet pipe, and the vertical rotating shaft is coaxially arranged with the rotary joint.

[0011] Preferably, the intermittent drive component includes a transmission disk, which is fixedly connected to the bottom end of the vertical rotating shaft. The outer circumferential array of the transmission disk has several actuating grooves. Between two actuating grooves, a fitting arc surface is formed on the outer side of the transmission disk. A support frame is fixedly connected to the inner side of the mounting cavity. A motor is fixedly mounted at the bottom of the support frame. A drive disk is fixedly connected to the rotating end of the motor. A drive arm is fixedly connected to the bottom of the drive disk. An actuating post is fixedly connected to the top of the end of the drive arm away from the drive disk. The actuating post corresponds to the actuating groove and is used to rotate the transmission disk by a fixed angle. The outer side of the drive disk has an outer arc surface and an avoidance groove. The outer arc surface is adapted to the fitting arc surface. When the outer arc surface slides into contact with the fitting arc surface, the transmission disk stops rotating.

[0012] Preferably, several carbon source addition units are provided, and each unit is correspondingly located above the partitioned water chamber. Each carbon source addition unit includes a carbon source dispensing component and an opening and closing component. Each carbon source addition unit includes an independent carbon source box, which is fixedly connected to the outside of the water inlet hopper. The bottom of the carbon source box is connected to a vertical pipe, and a valve housing is fixedly connected to the vertical pipe. The bottom of the valve housing is connected to a liquid outlet cover. A valve core is rotatably and sealingly connected to the inside of the valve housing. A valve hole is opened through the valve core, and a gear is fixedly connected to one end of the valve core after it extends out of the valve housing.

[0013] Preferably, the opening and closing component includes a connecting frame, which is fixedly connected to the outer wall of the valve housing. A transmission block is provided above the connecting frame. A horizontal part is provided at the top of the transmission block. Inclined parts are symmetrically provided on both sides of the transmission block. Two sliding grooves are symmetrically opened at the bottom of the transmission block. Two vertical sliding cylinders are symmetrically fixedly connected to the top of the connecting frame. The vertical sliding cylinders correspond one-to-one with the sliding grooves. The transmission block is slidably sleeved on the outside of the vertical sliding cylinders through the sliding grooves. A vertical rack is fixedly connected to the bottom of the transmission block. The vertical rack meshes with a gear. A spring is provided on the inner side of the vertical sliding cylinder. The top end of the spring is fixedly connected to the top of the inner side of the sliding groove, and the bottom end of the spring is fixedly connected to the bottom of the inner side of the vertical sliding cylinder.

[0014] Preferably, a fixing strip is fixedly connected to the outer wall of the water inlet pipe, and a squeezing wheel is rotatably connected to one end of the fixing strip; the squeezing wheel rotates synchronously with the water inlet pipe and can contact the inclined surface of the transmission block during the rotation, thereby pressing down the transmission block.

[0015] Preferably, the filler unit includes a perforated plate, which is fixedly connected to the bottom inner side of the implantation cavity.

[0016] Preferably, the packing unit further includes a first filter media layer, a second filter media layer, a third filter media layer, and a fourth filter media layer arranged sequentially from top to bottom;

[0017] The first filter media layer is a filter media layer composed of zeolite particles;

[0018] The second filter layer is a filter layer composed of ceramsite particles;

[0019] The third filter layer is a filter layer composed of activated carbon particles;

[0020] The fourth filter layer is a filter layer composed of crushed stone particles.

[0021] Preferably, the water outlet end of the water outlet pipe extends to the top of the packing unit inside the corresponding planting cavity.

[0022] Preferably, the number of actuating grooves is equal to the number of implantation cavities.

[0023] Compared with related technologies, the subsurface flow wetland downflow water purification device provided by the present invention has the following beneficial effects:

[0024] 1. This invention utilizes multiple independent planting chambers distributed circumferentially within the wetland bed, along with intermittently driven components of the water inlet unit. This allows each planting chamber to periodically alternate between an anoxic water inlet stage and an aerobic dry-out stage. During the water inlet stage, wastewater fills the gaps in the packing unit, rapidly depleting dissolved oxygen and creating an anoxic / anaerobic environment. Simultaneously added carbon sources provide electron donors for denitrifying bacteria, reducing the nitrate nitrogen accumulated in the previous cycle to nitrogen gas. During the dry-out stage, after the water is drained, air enters the gaps in the packing unit, creating an aerobic environment. Nitrifying bacteria oxidize ammonia nitrogen to nitrate nitrogen, while aerobic microorganisms degrade organic matter, thus improving the efficiency of removing organic matter, ammonia nitrogen, and total nitrogen.

[0025] 2. The carbon source addition unit of this invention is powered by the rotation of the water inlet unit, eliminating the need for an additional motor or solenoid valve. When the water inlet pipe rotates to align with a specific water-dividing chamber, the fixing strip on the outer wall of the water inlet pipe drives the squeezing wheel to rotate synchronously. The squeezing wheel contacts the inclined surface of the transmission block and presses down on the transmission block. The transmission block slides downward along the vertical slide cylinder, driving the vertical rack drive gear to rotate, causing the valve core to rotate to the open position. The liquid carbon source in the carbon source box drips into the sewage through the vertical pipe, valve hole, and liquid outlet cover. When the water inlet pipe rotates away from the water-dividing chamber, the squeezing wheel separates from the transmission block, the spring pushes the transmission block to reset, the valve core closes, and the addition of carbon source stops. This achieves the addition of carbon source during water distribution and the cessation of carbon source addition during water shut-off, reducing the ineffective consumption of carbon source during the aerobic stage.

[0026] 3. In this invention, when one planting chamber is in a water-saturated state, the remaining planting chambers gradually enter a drying and aerobic state. During the drying process, air enters the pores of the packing unit to provide oxygen for aerobic microorganisms. The periodic alternation of dryness and wetness can promote the renewal of biofilm on the surface of the packing and reduce the excessive accumulation of metabolic products and suspended matter.

[0027] 4. This invention uses a motor as a power source, and the intermittent drive of the water inlet unit and the opening and closing of the carbon source addition unit can be linked together through a purely mechanical structure, reducing the use of electrical control components. Attached Figure Description

[0028] Figure 1 A schematic diagram of the overall structure of the subsurface flow wetland downflow water purification device provided by the present invention;

[0029] Figure 2 This is a cross-sectional view of the subsurface flow wetland downflow water purification device of the present invention;

[0030] Figure 3 This is a partial structural schematic diagram of the subsurface flow wetland downflow water purification device of the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of the water inlet unit in this invention;

[0032] Figure 5This is a schematic diagram of the structure of the transmission disc in this invention;

[0033] Figure 6 This is a schematic diagram of the water receiving tray in this invention;

[0034] Figure 7 This is a schematic diagram of the structure of the carbon source delivery component in this invention;

[0035] Figure 8 This is a cross-sectional view of the carbon source addition unit in this invention;

[0036] Figure 9 This is a cross-sectional view of the valve core in this invention;

[0037] Figure 10 This is a schematic diagram of the structure when the extrusion wheel presses the transmission block to its lowest position in this invention;

[0038] Figure 11 This is a schematic diagram of the structure of the packing unit in this invention.

[0039] Numbered in the diagram: 1. Wetland bed; 101. Installation cavity; 102. Planting cavity; 103. Water outlet; 104. Water purification cavity; 2. Support frame; 3. Water inlet unit; 31. Water inlet component; 311. Fixing frame; 312. Water inlet hopper; 313. Rotary joint; 314. Water inlet pipe; 315. Water receiving tray; 316. Separating water cavity; 317. Water outlet pipe; 318. Vertical rotating shaft; 32. Intermittent drive component; 321. Transmission disc; 3211. Actuating groove; 3212. Fitting arc surface; 322. Motor; 323. Drive disc; 3231. Outer arc surface; 3232. Avoidance groove; 324. Drive arm; 325. Actuating mechanism 4. Column; 4. Carbon source addition unit; 41. Carbon source dispensing component; 411. Carbon source box; 412. Vertical pipe; 413. Liquid outlet hood; 414. Valve body; 415. Valve hole; 416. Gear; 417. Valve core; 42. Opening and closing component; 421. Connecting frame; 422. Transmission block; 4221. Horizontal part; 4222. Inclined part; 423. Slide groove; 424. Vertical slide cylinder; 425. Vertical rack; 426. Spring; 427. Fixing strip; 428. Extrusion wheel; 5. Packing unit; 501. Mesh plate; 502. First filter media layer; 503. Second filter media layer; 504. Third filter media layer; 505. Fourth filter media layer. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0041] Example 1

[0042] Please refer to the following: Figures 1 to 6A subsurface wetland downflow water purification device includes a wetland bed 1, an installation cavity 101 divided at the center of the wetland bed 1, a plurality of planting cavities 102 arranged in a circular pattern on the inner side of the wetland bed 1, a water purification cavity 104 disposed on the inner side of the wetland bed 1 below the plurality of planting cavities 102, and an outlet 103 connected to the water purification cavity 104 disposed on the lower part of one side of the wetland bed 1.

[0043] Each implantation cavity 102 has a filling unit 5 installed on its inner side;

[0044] A water inlet unit 3 is installed inside the installation cavity 101, and a carbon source addition unit 4 is installed on the water inlet unit 3.

[0045] The outlet end of the water inlet unit 3 can rotate intermittently, and each time it stops rotating, it is aligned with a planting cavity 102 and the sewage is transported to the packing unit 5 inside the planting cavity 102.

[0046] The carbon source addition unit 4 uses the rotation of the water inlet unit 3 as power to automatically add carbon source to the water inlet of the corresponding implantation cavity 102.

[0047] In the above, by dividing the wetland bed 1 into a central installation cavity 101, a circumferentially distributed planting cavity 102, and a bottom water purification cavity 104, the functional areas of the device are divided. The independent planting cavity 102 ensures that the wastewater treatment process of each cavity does not interfere with each other, and can form an independent aerobic-anoxic alternating environment. At the same time, it is convenient to replace and maintain the packing unit 5 in a single planting cavity 102 in the later stage.

[0048] Furthermore, the water inlet unit 3 includes a water inlet component 31 and an intermittent drive component 32; the water inlet component 31 includes a fixing frame 311, which is fixedly connected to the top of the wetland bed 1. A water inlet hopper 312 is fixedly connected to the upper end of the fixing frame 311, and a rotary joint 313 is fixedly connected to the bottom end of the water inlet hopper 312. A water inlet pipe 314 is fixedly connected to the end of the rotary joint 313 away from the water inlet hopper 312. A water receiving tray 315 is fixedly connected to the fixing frame 311 below the water inlet pipe 314. The inner side of the water receiving tray 315 is divided into several circumferentially distributed sections corresponding one-to-one with the planting chamber 102. The water inlet pipe 314 is aligned with the water inlet 316 directly below the water inlet 316. The bottom of the water receiving tray 315 is fixedly connected to several water outlet pipes 317 corresponding to the water inlet 316. The water inlet of the water outlet pipe 317 is connected to the corresponding water inlet 316. A vertical rotating shaft 318 is vertically rotatably connected through the center of the water receiving tray 315. The top of the vertical rotating shaft 318 is fixedly connected to the outer wall of the water inlet pipe 314. The vertical rotating shaft 318 is coaxially arranged with the rotary joint 313. The water outlet of the water outlet pipe 317 extends to the top of the packing unit 5 in the corresponding planting cavity 102.

[0049] In the above, the water inlet component 31 connects the water inlet hopper 312 for fixed water inlet and the water inlet pipe 314 for rotating water distribution through the rotary joint 313; the water receiving tray 315 has a water separation chamber 316 for wastewater diversion, ensuring that the wastewater flowing out of the water inlet pipe 314 only enters the currently aligned water separation chamber 316 and does not leak into other planting chambers 102; the water outlet end of the water outlet pipe 317 extends directly to the top of the packing unit 5, which can spread the wastewater on the surface of the packing.

[0050] Furthermore, the intermittent drive component 32 includes a transmission disk 321, which is fixedly connected to the bottom end of the vertical rotating shaft 318. The outer circumference of the transmission disk 321 is provided with a plurality of actuating grooves 3211. Between two actuating grooves 3211, a fitting arc surface 3212 is provided on the outer side of the transmission disk 321. A support frame 2 is fixedly connected to the inner side of the mounting cavity 101. A motor 322 is fixedly mounted at the bottom of the support frame 2. A drive disk 323 is fixedly connected to the rotating end of the motor 322. A drive arm 324 is fixedly connected to the bottom of the drive disk 323. The end of the drive arm 324 furthest from the drive disk 323... A toggle post 325 is fixedly connected to the drive disk 323. The toggle post 325 corresponds to the toggle groove 3211 and is used to rotate the drive disk 321 by a fixed angle. The outer side of the drive disk 323 is provided with an outer arc surface 3231 and a clearance groove 3232. The outer arc surface 3231 is adapted to the mating arc surface 3212. When the outer arc surface 3231 and the mating arc surface 3212 slide and fit together, the drive disk 321 stops rotating. The clearance groove 3232 is used to avoid the drive disk 321, so that the drive disk 323 will not obstruct the rotation of the drive disk 321. The number of toggle grooves 3211 is equal to the number of implantation cavities 102.

[0051] In the above, the continuous rotation of motor 322 is converted into the intermittent step rotation of transmission disc 321. The rotation angle of each rotation is exactly the same as the central angle of the two adjacent implantation chambers 102, ensuring that the water inlet pipe 314 can be aligned with a water separation chamber 316 each time it stops. The cooperation between the outer arc surface 3231 and the mating arc surface 3212 can prevent the transmission disc 321 from rotating on its own during the non-rotating stage, ensuring the accuracy of the water distribution position. The design of the avoidance groove 3232 eliminates the motion interference between the drive disc 323 and the transmission disc 321, making the entire transmission process smooth and without jamming, and achieving intermittent water distribution control without a complex electronic control system.

[0052] Example 2

[0053] For further details, please refer to [link / reference]. Figures 1 to 10Based on Embodiment 1, several carbon source addition units 4 are provided, and each is correspondingly arranged above each partition water chamber 316. The carbon source addition unit 4 includes a carbon source dispensing component 41 and an opening and closing component 42. Each carbon source addition unit 4 includes an independent carbon source box 411, which is fixedly connected to the outside of the water inlet hopper 312. The bottom end of the carbon source box 411 is connected to a vertical pipe 412, and a valve body 414 is fixedly connected to the vertical pipe 412. The bottom end of the valve body 414 is connected to a liquid outlet hood 413. The inner side of the valve body 414 is sealed and rotatably connected to a valve core 417. A valve hole 415 is opened through the valve core 417. When the valve core 417 is rotated to the open position, the valve hole 415 connects the outlet end of the vertical pipe 412 and the inlet end of the liquid outlet hood 413. One end of the valve core 417 extends out of the valve body 414 and is fixedly connected to a gear 416.

[0054] In the above-mentioned carbon source delivery component 41 adopts the principle of gravity-based liquid supply, which can realize the automatic delivery of carbon source without additional pumping equipment, thereby reducing the operating energy consumption and equipment cost of the device; the sealed rotating connection structure between the valve core 417 and the valve body 414 ensures that the carbon source will not leak when the valve is closed; the liquid outlet hood 413 can evenly disperse the carbon source into the lower partition water chamber 316, so that the carbon source is mixed with the sewage and the efficiency of the denitrification reaction is improved; the fixed connection between the gear 416 and the valve core 417 can convert linear motion into the rotational motion of the valve core 417, thereby realizing the opening and closing of the valve.

[0055] Furthermore, the opening and closing component 42 includes a connecting frame 421, which is fixedly connected to the outer wall of the valve housing 414. A transmission block 422 is provided above the connecting frame 421. A horizontal part 4221 is provided at the top of the transmission block 422, and inclined parts 4222 are symmetrically provided on both sides of the transmission block 422. The two ends of the horizontal part 4221 smoothly transition to the two inclined parts 4222 with rounded corners. Two sliding grooves 423 are symmetrically opened at the bottom of the transmission block 422. The top of the connecting frame 421 is aligned with... Two vertical sliding cylinders 424 are fixedly connected, and each vertical sliding cylinder 424 corresponds to a sliding groove 423. The transmission block 422 is slidably sleeved on the outside of the vertical sliding cylinder 424 through the sliding groove 423. A vertical rack 425 is fixedly connected to the bottom of the transmission block 422, and the vertical rack 425 meshes with a gear 416. A spring 426 is provided on the inside of the vertical sliding cylinder 424. The top end of the spring 426 is fixedly connected to the top inside of the sliding groove 423, and the bottom end of the spring 426 is fixedly connected to the bottom inside of the vertical sliding cylinder 424.

[0056] In the above, the opening and closing component 42, through the cooperation of the vertical sliding cylinder 424 and the sliding groove 423, ensures that the transmission block 422 can only move in a straight line in the vertical direction, avoiding the transmission block 422 from deviating and causing the vertical rack 425 and gear 416 to disengage; the spring 426 provides the transmission block 422 with the power for automatic reset, and when the external extrusion pressure disappears, it can drive the valve core 417 to rotate to the closed position, cutting off the carbon source supply; the symmetrically arranged inclined surfaces 4222 on both sides of the top of the transmission block 422 can smoothly press down the transmission block 422 when the extrusion wheel 428 rotates past, and can also push the transmission block 422 to rise smoothly with the spring 426, improving the reliability of the device operation.

[0057] Furthermore, a fixing strip 427 is fixedly connected to the outer wall of the water inlet pipe 314, and a pressing wheel 428 is rotatably connected to one end of the fixing strip 427; the pressing wheel 428 rotates synchronously with the water inlet pipe 314, and can contact the inclined surface 4222 of the transmission block 422 during the rotation process, thereby pressing down the transmission block 422.

[0058] In the above, the rotational motion of the water inlet pipe 314 serves as the sole power source for the opening and closing of the carbon source addition unit 4. No additional electrical control equipment such as motors or solenoid valves is required, achieving synchronous linkage between water inlet and carbon source addition and ensuring the accuracy of carbon source addition timing. The extrusion wheel 428 uses a rotating connection, converting the sliding friction between the extrusion wheel 428 and the transmission block 422 into rolling friction, reducing wear between components. The fixed connection between the fixing strip 427 and the water inlet pipe 314 ensures that the rotational trajectory of the extrusion wheel 428 is completely consistent with the water distribution trajectory of the water inlet pipe 314, ensuring that the corresponding carbon source addition unit 4 will only open when the water inlet pipe 314 is aligned with a specific water chamber 316 for water distribution.

[0059] Example 3

[0060] For further details, please refer to [link / reference]. Figures 1 to 11 Based on Embodiment 2, the filler unit 5 includes a perforated plate 501, which is fixedly connected to the bottom inner side of the planting chamber 102 to support the filter material. The perforated plate 501 is a stainless steel or UPVC perforated plate.

[0061] As described above, the perforated plate 501 is made of stainless steel or UPVC, which has excellent corrosion resistance and anti-aging properties, and can operate stably in the sewage environment for a long time, avoiding the loss of filter media due to material corrosion and damage. The perforated plate 501 is used to support the upper filter media, preventing filter media particles from falling into the lower water purification chamber 104, and ensuring that the purified water can pass smoothly through the perforated plate 501 and flow into the water purification chamber 104. The fixed connection between the perforated plate 501 and the inner side of the planting chamber 102 can provide stable support for the upper packing unit 5.

[0062] Furthermore, the packing unit 5 also includes a first filter media layer 502, a second filter media layer 503, a third filter media layer 504, and a fourth filter media layer 505 arranged sequentially from top to bottom, with the mesh plate 501 located below the fourth filter media layer 505; the first filter media layer 502 is a filter media layer composed of zeolite particles; the second filter media layer 503 is a filter media layer composed of ceramsite particles; the third filter media layer 504 is a filter media layer composed of activated carbon particles; and the fourth filter media layer 505 is a filter media layer composed of crushed stone particles.

[0063] In the above, the first filter layer 502 is a filter layer composed of zeolite particles, which is used to evenly distribute water, intercept large suspended particles, and adsorb ammonia nitrogen using the ion exchange capacity of zeolite; the second filter layer 503 is a filter layer composed of ceramsite particles, which have a rough surface and large specific surface area, which is conducive to the attachment of microorganisms to form a biofilm; the third filter layer 504 is a filter layer composed of activated carbon particles, which have a very strong adsorption capacity and can adsorb organic matter and trace pollutants. The adsorbed organic matter can be slowly decomposed by microorganisms in the anaerobic stage, serving as a supplementary carbon source; the fourth filter layer 505 is a filter layer composed of crushed stone particles, which supports the upper filter layers and ensures smooth water flow.

[0064] Furthermore, motor 322 is electrically connected to an external control switch via wires.

[0065] As described above, the operator can control the start and stop of motor 322 through an external control switch, thereby controlling the operation and shutdown of the entire device.

[0066] The working principle of the subsurface flow wetland downflow water purification device provided by this invention is as follows:

[0067] The motor 322 is started, which drives the drive disk 323 to rotate. As the drive disk 323 rotates, the actuating pin 325 moves in a circular motion. When the actuating pin 325 enters an actuating groove 3211 on the transmission disk 321, it actuates the transmission disk 321 to rotate by a fixed angle. Subsequently, the outer arc surface 3231 of the drive disk 323 slides against the contact arc surface 3212 on the transmission disk 321, at which point the transmission disk 321 does not rotate. The 3 is also provided with a clearance groove 3232, which is used to avoid the transmission disk 321 during the tossing interval and avoid blocking its rotation; the number of tossing grooves 3211 is equal to the number of implantation chambers 102, so that the angle of the transmission disk 321 is exactly equal to the central angle between two adjacent implantation chambers 102 each time it rotates; through the above structure, the continuous rotation of the motor 322 is converted into the intermittent rotation of the transmission disk 321, and the intermittent rotation of the transmission disk 321 drives the vertical rotating shaft 318 and the water inlet pipe 314 to rotate intermittently in sync.

[0068] After large particles of impurities are removed by the screen, the wastewater to be treated is sent into the inlet hopper 312 through an external pipe. The wastewater then enters the inlet pipe 314 through the rotary joint 313. The fixing frame 311 is fixedly connected to the top of the wetland bed 1 to support the inlet hopper 312 and the water receiving tray 315. The water receiving tray 315 is fixedly connected to the fixing frame 311 and located below the inlet pipe 314. The inner side of the water receiving tray 315 is divided into several partitioned water chambers 316 that correspond one-to-one with the planting chamber 102 and are distributed in a circular pattern. When the water outlet of the inlet pipe 314 stops rotating, it is aligned with one of the partitioned water chambers 316 directly below. The wastewater is injected into the partitioned water chamber 316 and then flows out downward through the corresponding outlet pipe 317 at its bottom.

[0069] The outlet end of each water outlet pipe 317 extends into the top of the packing unit 5 inside the corresponding planting cavity 102, and the wastewater is transported to the currently aligned planting cavity 102 and begins to seep downwards.

[0070] The extrusion wheel 428 in the carbon source addition unit 4 rotates synchronously with the water inlet pipe 314. When the water inlet pipe 314 rotates and drives the extrusion wheel 428 to pass above the transmission block 422, the extrusion wheel 428 contacts the inclined surface 4222 on one side of the transmission block 422. As the extrusion wheel 428 continues to rotate, it rolls along the inclined surface 4222, causing the transmission block 422 to slide downwards gradually. The transmission block 422 is slidably sleeved on the outside of the vertical slide cylinder 424 through the slide groove 423. When the transmission block 422 is pressed down and slides downwards, it overcomes the elastic force of the spring 426 inside the vertical slide cylinder 424 and moves downwards in the vertical direction.

[0071] When the transmission block 422 moves downward, the vertical rack 425 drives the gear 416 to rotate, thereby causing the valve core 417 to rotate inside the valve housing 414. When the transmission block 422 is pressed down to the lowest position, the valve core 417 rotates to the open position. At this time, the valve hole 415 through the valve core 417 connects the outlet end of the vertical pipe 412 and the inlet end of the liquid outlet cover 413.

[0072] The carbon source box 411 stores liquid denitrification carbon sources such as sodium acetate and glucose as needed. After the valve core 417 is opened, the carbon source flows from the carbon source box 411 into the vertical pipe 412 under the action of gravity, and drips from the outlet hood 413 through the valve hole 415 in the valve body 414. It mixes with the sewage being transported and enters the packing unit 5 at the current position. As the inlet pipe 314 continues to rotate, the extrusion wheel 428 gradually separates from the inclined part 4222 on the other side of the current transmission block 422. The extrusion force on the transmission block 422 gradually disappears. Under the action of the restoring force of the spring 426, the transmission block 422 gradually moves upward to reset. The vertical rack 425 moves upward accordingly, and the reverse drive gear 416 and valve core 417 rotate back to the closed position. The valve hole 415 is opened, and the addition of carbon source at this position stops.

[0073] Each implantation chamber 102 goes through the following two stages periodically, and plants such as reeds and calamus can be selectively planted in the implantation chamber 102 as needed.

[0074] When the water inlet pipe 314 is aligned with a certain planting cavity 102 to distribute water, a large amount of sewage is poured into the packing unit 5 from top to bottom, filling the gaps between the packing particles and expelling air.

[0075] The dissolved oxygen in the sewage was quickly consumed by aerobic microorganisms, and the entire interior of the implantation cavity 102 was in a state of hypoxia / anaerobicness.

[0076] At this time, carbon source addition unit 4 operates synchronously, adding carbon source to wastewater. Under anoxic / anaerobic conditions, denitrifying bacteria use carbon source as electron donor to reduce nitrate nitrogen accumulated in the previous aerobic stage into nitrogen gas, achieving efficient denitrification.

[0077] When the inlet pipe 314 rotates away and turns to the next planting chamber 102, the current planting chamber 102 stops receiving water. The water that has entered the packing unit 5 continues to seep downwards, enters the clean water chamber 104 through the mesh plate 501, and is discharged from the outlet 103.

[0078] As the water is drained, the gaps between the filler particles are refilled with air, and the entire implantation cavity 102 is transformed into an aerobic state.

[0079] In an aerobic environment, nitrifying bacteria oxidize ammonia nitrogen in wastewater into nitrate nitrogen, while aerobic microorganisms degrade organic matter. No carbon source is added during this stage to avoid the carbon source being wasted by aerobic microorganisms.

[0080] Through the above-mentioned periodic alternation, the aerobic nitrification and anoxic denitrification are sequentially separated in each planting chamber 102, and organic matter, ammonia nitrogen and total nitrogen can be removed simultaneously without a complex internal structure.

[0081] Wastewater carrying carbon sources permeates downwards through the packing unit 5. The first filter layer 502 is zeolite, used for uniform water distribution, intercepting large suspended particles, and utilizing the ion exchange capacity of zeolite to adsorb ammonia nitrogen. The second filter layer 503 is ceramsite, which has a rough surface and large specific surface area, facilitating the attachment of microorganisms to form a biofilm, while further filtering. The third filter layer 504 is activated carbon, which has a strong adsorption capacity and can adsorb organic matter and trace pollutants. The adsorbed organic matter can be slowly decomposed by microorganisms in the anaerobic stage, serving as a supplementary carbon source to enhance the denitrification reaction. The fourth filter layer 505 is crushed stone, which supports the upper filter layers and ensures smooth water flow. The perforated plate 501 supports all filter media and prevents them from falling into the lower water purification chamber 104.

[0082] After being purified by the filler unit 5, the water passes through the mesh plate 501 and flows into the water purification chamber 104 at the bottom of the wetland bed 1. The water purification chamber 104 is located below several planting chambers 102 and is used to collect the clean water that seeps down from all the planting chambers 102. Finally, the purified water is discharged from the device through the outlet 103, completing the entire purification process.

[0083] The motor 322 runs continuously, and the water inlet pipe 314 rotates and stops periodically, sequentially distributing water and adding carbon sources to each planting chamber 102. When one planting chamber 102 is in the anaerobic stage of water intake, the other planting chambers 102 are in the aerobic stage of water drying. This alternating "rotation" method allows the microbial community in each planting chamber 102 to periodically obtain aerobic and anaerobic environments, which is conducive to the synergistic growth of nitrifying bacteria and denitrifying bacteria, and improves the overall treatment efficiency and operational stability of the device.

[0084] The above are merely embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A subsurface flow wetland downflow water purification device, characterized in that, The wetland bed (1) includes an installation cavity (101) at its center, a plurality of planting cavities (102) arranged in a circular pattern on the inner side of the wetland bed (1), a water purification cavity (104) located below the plurality of planting cavities (102) on the inner side of the wetland bed (1), and an outlet (103) connected to the water purification cavity (104) located on the lower side of one side of the wetland bed (1). Each of the implantation cavities (102) is provided with a packing unit (5) on its inner side; A water inlet unit (3) is installed inside the mounting cavity (101), and a carbon source addition unit (4) is installed on the water inlet unit (3). The outlet end of the water inlet unit (3) can rotate intermittently, and each time it stops rotating, it is aligned with one of the planting cavities (102) and the sewage is transported to the packing unit (5) inside the planting cavity (102); The carbon source addition unit (4) uses the rotation of the water inlet unit (3) as power to automatically add carbon source to the water inlet of the corresponding implantation cavity (102).

2. The subsurface flow wetland downflow water purification device according to claim 1, characterized in that, The water inlet unit (3) includes a water inlet component (31) and an intermittent drive component (32); the water inlet component (31) includes a fixing frame (311), which is fixedly connected to the top of the wetland bed (1). A water inlet hopper (312) is fixedly connected to the upper end of the fixing frame (311), and a rotary joint (313) is fixedly connected to the bottom end of the water inlet hopper (312). A water inlet pipe (314) is fixedly connected to the end of the rotary joint (313) away from the water inlet hopper (312). A water receiving tray (315) is fixedly connected to the fixing frame (311) below the water inlet pipe (314). The inner side of the water receiving tray (315) is divided into several... Each of the planting chambers (102) has a separate water chamber (316) that corresponds to it and is distributed in a circular pattern. The water outlet of the water inlet pipe (314) is aligned with one of the separate water chambers (316) directly below it. The bottom of the water receiving tray (315) is fixedly connected to several water outlet pipes (317) that correspond to the separate water chambers (316). The water inlet of the water outlet pipe (317) is connected to the corresponding separate water chamber (316). A vertical rotating shaft (318) is vertically rotatably connected through the center of the water receiving tray (315). The top of the vertical rotating shaft (318) is fixedly connected to the outer wall of the water inlet pipe (314), and the vertical rotating shaft (318) is coaxially arranged with the rotary joint (313).

3. The subsurface flow wetland downflow water purification device according to claim 2, characterized in that, The intermittent drive component (32) includes a transmission disk (321), which is fixedly connected to the bottom end of the vertical rotating shaft (318). The outer circumferential array of the transmission disk (321) has several actuating grooves (3211). The outer side of the transmission disk (321) has a fitting arc surface (3212) between two actuating grooves (3211). A support frame (2) is fixedly connected to the inner side of the mounting cavity (101). A motor (322) is fixedly mounted at the bottom of the support frame (2). A drive disk (323) is fixedly connected to the rotating end of the motor (322). (323) A drive arm (324) is fixedly connected to the bottom. A toggle post (325) is fixedly connected to the top of the end of the drive arm (324) away from the drive disk (323). The toggle post (325) corresponds to the toggle groove (3211) and is used to toggle the transmission disk (321) to rotate by a fixed angle. The outer side of the drive disk (323) is provided with an outer arc surface (3231) and a clearance groove (3232). The outer arc surface (3231) is adapted to the fitting arc surface (3212). When the outer arc surface (3231) and the fitting arc surface (3212) slide and fit together, the transmission disk (321) stops rotating.

4. The subsurface flow wetland downflow water purification device according to claim 3, characterized in that, The carbon source addition unit (4) is provided in several units, and is arranged above each of the partition water chambers (316) in a corresponding manner. The carbon source addition unit (4) includes a carbon source dispensing component (41) and an opening and closing component (42). Each carbon source addition unit (4) includes an independent carbon source box (411). The carbon source box (411) is fixedly connected to the outside of the water inlet hopper (312). The bottom end of the carbon source box (411) is connected to a vertical pipe (412). A valve housing (414) is fixedly connected to the vertical pipe (412). The bottom end of the valve housing (414) is connected to a liquid outlet cover (413). A valve core (417) is rotatably connected to the inner side of the valve housing (414). A valve hole (415) is opened through the valve core (417). One end of the valve core (417) extends out of the valve housing (414) and is fixedly connected to a gear (416).

5. A subsurface flow wetland downflow water purification device according to claim 4, characterized in that, The opening and closing component (42) includes a connecting frame (421), which is fixedly connected to the outer wall of the valve housing (414). A transmission block (422) is provided above the connecting frame (421). A horizontal part (4221) is provided at the top of the transmission block (422). Inclined parts (4222) are symmetrically provided on both sides of the transmission block (422). Two sliding grooves (423) are symmetrically opened at the bottom of the transmission block (422). Two vertical sliding cylinders (424) are symmetrically fixedly connected to the top of the connecting frame (421). The cylinder (424) corresponds one-to-one with the sliding groove (423). The transmission block (422) is slidably sleeved on the outside of the vertical cylinder (424) through the sliding groove (423). A vertical rack (425) is fixedly connected to the bottom of the transmission block (422). The vertical rack (425) meshes with the gear (416). A spring (426) is provided on the inner side of the vertical cylinder (424). The top end of the spring (426) is fixedly connected to the top of the inner side of the sliding groove (423), and the bottom end of the spring (426) is fixedly connected to the bottom of the inner side of the vertical cylinder (424).

6. The subsurface flow wetland downflow water purification device according to claim 5, characterized in that, A fixing strip (427) is fixedly connected to the outer wall of the water inlet pipe (314), and a pressing wheel (428) is rotatably connected to one end of the fixing strip (427); the pressing wheel (428) rotates synchronously with the water inlet pipe (314), and can contact the inclined surface (4222) of the transmission block (422) during the rotation process, thereby pressing down the transmission block (422).

7. A subsurface flow wetland downflow water purification device according to claim 1, characterized in that, The filler unit (5) includes a perforated plate (501), which is fixedly connected to the bottom inner side of the implantation cavity (102).

8. A subsurface flow wetland downflow water purification device according to claim 7, characterized in that, The packing unit (5) further includes a first filter layer (502), a second filter layer (503), a third filter layer (504), and a fourth filter layer (505) arranged sequentially from top to bottom; The first filter media layer (502) is a filter media layer composed of zeolite particles; The second filter layer (503) is a filter layer composed of ceramsite particles; The third filter layer (504) is a filter layer composed of activated carbon particles; The fourth filter layer (505) is a filter layer composed of crushed stone particles.

9. A subsurface flow wetland downflow water purification device according to claim 2, characterized in that, The water outlet end of the water outlet pipe (317) extends to the top of the packing unit (5) inside the corresponding planting cavity (102).

10. A subsurface flow wetland downflow water purification device according to claim 3, characterized in that, The number of the actuating grooves (3211) is equal to the number of the implantation cavities (102).

Images