Modular wetland wastewater treatment test device and method

Abstract

The application provides a modular wetland sewage treatment test device and method, which comprises a treatment test box, a layered treatment mechanism is arranged in the treatment test box, and the layered treatment mechanism is used for assisting in grading treatment of water flow; the layered treatment mechanism comprises symmetrically arranged inclined plates one on the upper side of the inside of the treatment test box, flat plates one are arranged between the bottom ends of the inclined plates one, mesh one is arranged in the middle of the flat plates one, symmetrically distributed inclined plates two are arranged in the middle of the inside of the treatment test box, flat plates two are arranged at the bottom ends of the inclined plates two, mesh two is arranged in the middle of the flat plates two, and U-shaped flow collecting plates are arranged on the lower side of the inside of the treatment test box. Through the modular wetland sewage treatment test device and method, the water flow can be in a controllable flow state under the action of the multistage laminated trapezoidal structure, the effective hydraulic retention time is significantly increased, and the reaction volume utilization rate can be effectively improved.

Description

Technical Field

[0001] This invention relates to the field of technology, specifically to a modular wetland wastewater treatment experimental device and method. Background Technology

[0002] Wetland wastewater treatment, usually referring to artificial wetland wastewater treatment technology, is a wastewater treatment system that is artificially constructed and controlled to mimic the structure and function of natural wetland ecosystems. It embodies the engineering and productization of ecological principles and provides a sustainable solution that combines environmental, social, and economic benefits.

[0003] Existing modular wetland wastewater treatment experimental devices construct pools / beds using reinforced concrete and HDPE geomembranes as impermeable materials. The interior of these pools / beds is filled with a matrix (filler) layer, typically including large-diameter gravel, medium-diameter gravel, crushed stone, special functional fillers, and a sand layer. A plant system is then planted on the matrix, and a water distribution and collection system ensures uniform inflow and outflow of wastewater, thus achieving wastewater treatment. However, in actual use, the water flows vertically through the filler bed, forming a stable "preferred flow channel" between the inlet and outlet. Most of the water flows rapidly through this channel, resulting in a large number of filler areas (especially the center and corners) failing to fully participate in the reaction, forming "dead zones" and leading to low effective reaction volume utilization. Summary of the Invention

[0004] In view of this, the present invention addresses the shortcomings of the prior art by providing a modular wetland wastewater treatment experimental device and method. Through a multi-level stacked trapezoidal structure, the water flow can be tortuous but controlled under the action of this structure, which significantly increases the effective hydraulic retention time and can effectively improve the utilization rate of reaction volume.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a modular wetland wastewater treatment experimental device and method, including a treatment experimental chamber, wherein a layered treatment mechanism is provided inside the treatment experimental chamber, and the layered treatment mechanism is used to perform auxiliary graded treatment of water flow. The layered processing mechanism includes an inclined plate 1 symmetrically arranged on the upper side inside the processing test chamber, a flat plate 1 between the bottom ends of the inclined plate 1, a mesh screen 1 in the middle of the flat plate 1, an inclined plate 2 symmetrically distributed in the middle of the inside of the processing test chamber, a flat plate 2 at the bottom end of the inclined plate 2, a mesh screen 2 in the middle of the flat plate 2, and a U-shaped busbar on the lower side inside the processing test chamber. The treatment test chamber is also equipped with a rotating water distribution mechanism, which is used to distribute water to floating plants.

[0006] As a further improvement of the present invention, the first inclined plate is disposed on the inner walls of both sides of the processing test box and tilted towards the vertical center of the processing test box, and the second inclined plate is disposed in the middle of the processing test box from the vertical center of the processing test box towards the side wall of the processing test box; the layered processing mechanism also includes a first partition plate evenly spaced on the first inclined plate, a second partition plate evenly spaced on the second inclined plate, and a third partition plate evenly spaced on both sides of the U-shaped manifold, and a third partition plate evenly spaced on the first, second and third partition plates, and a third partition plate evenly spaced on each of the third partition plates.

[0007] As a further improvement of the present invention, the rotary water distribution mechanism includes two sliding rails disposed on the upper side of the treatment test chamber, with sliding blocks slidably disposed on both sides of the sliding rails, and a water distribution pipe disposed between the sliding blocks on the same side. Multiple water outlets are disposed on the lower side of the water distribution pipe, and water inlet valves are disposed at both ends of the water distribution pipe. The rotary water distribution mechanism also includes two fixed plates disposed on the upper side of the treatment test chamber. Multiple evenly spaced tooth groups are disposed on both sides of the lower surface of the fixed plates, and gears are disposed on both sides of the outer arc surface of the water distribution pipe. The gears are meshed with the tooth groups.

[0008] As a further improvement of the present invention, the rotary water distribution mechanism also includes a fixed frame disposed on the upper surface of the treatment test chamber, with connecting blocks slidably disposed on both sides of the fixed frame, and the connecting blocks being connected and fixed to the water distribution pipe; a control seat is disposed on the upper side of the fixed frame, with movable rods slidably disposed on both sides of the control seat, the ends of the movable rods being connected and fixed to the connecting blocks; adjusting screws are rotatably disposed on both sides inside the control seat, the adjusting screws being threadedly connected to the adjacent movable rods; a dual-axis motor is disposed in the middle of the control seat, and the output shaft of the dual-axis motor is fixed to the adjacent adjusting screws by a coupling.

[0009] As a further improvement of the present invention, a water outlet pipe is provided on the lower side of the treatment test chamber, and water outlet valves are provided at both ends of the water outlet pipe. The water outlet in the middle of the U-shaped manifold is connected to the water outlet pipe. A base is provided at the bottom of the treatment test chamber, and mounting holes are provided at the four corners of the lower surface of the base.

[0010] A modular wetland wastewater treatment experimental method is described below: S1. Place multiple treatment test boxes neatly side by side in the reserved work area, and then pass bolts through the pre-drilled mounting holes at the four corners of the lower surface of the base. Then, use external tools to tighten the bolts to fix the position of the treatment test boxes, so that the neatly arranged treatment test boxes can be modularly assembled into a complete artificial wetland wastewater treatment experimental unit system. S2, a mineralization adsorption layer (composed of zeolite, steel slag and other adsorption fillers) is laid on the U-shaped manifold at the bottom. The uniform laying of the mineralization adsorption layer is facilitated by the partitions three evenly arranged on both sides of the U-shaped manifold. An anaerobic denitrification layer (composed of special modified biochar fillers) is laid on the trapezoidal plate composed of inclined plate two and flat plate two in the middle. The uniform laying of the anaerobic denitrification layer is facilitated by the partitions two evenly arranged on inclined plate two on both sides. An aerobic nitrification layer (composed of sand, gravel and crushed stone) is laid on the inverted trapezoidal plate composed of inclined plate one and flat plate one on the upper side. Then, plants with strong oxygen-secreting capacity, such as water celery, are planted on the aerobic nitrification layer to form a floating plant filter bed. S3, the water pump installed on the external water supply tank is connected to the inlet valve installed on each treatment experimental box through the water supply pipe group, and then the water collection pipe group installed on the water collection tank is connected to the outlet valve installed on each treatment experimental box, so that the water source in the external water supply tank is transported into the water distribution pipe installed on each treatment experimental box through the water supply pipe group under the action of the water pump, and the sewage is evenly sprayed on the floating plant filter bed like fine rain through the water outlet installed on the water distribution pipe. S4, wastewater sprayed from the water distribution pipe enters the aerobic nitrification layer through the floating plant filter bed. During this process, the floating plant filter bed removes nitrogen, adjusts pH, and removes phosphorus. Wastewater entering the aerobic nitrification layer undergoes enhanced nitrification. The wastewater reacted in the aerobic nitrification layer continuously seeps down until it remains on the inclined plate one. Then, it flows through the inclined plate one, which is tilted towards the vertical center of the treatment test chamber, to the plate one located above the vertical center of the treatment test chamber. Then, it seeps down through the strainer one set on the plate one into the trapezoidal plate body composed of the inclined plate two and the plate two, where the anaerobic denitrification layer is laid. This allows the wastewater treated by the aerobic nitrification layer to collect in the upper middle part of the treatment test chamber under the action of the inverted trapezoidal plate body composed of the inclined plate one and the plate one, and then seeps down into the anaerobic denitrification layer through the strainer one. Wastewater seeping into the anaerobic denitrification layer undergoes a denitrification reaction under the action of special modified biochar packing, further treating the wastewater. After being treated in the anaerobic denitrification layer, the wastewater falls onto the second inclined plate. The wastewater in the middle is diverted to both sides by two symmetrically distributed inclined plates 2 that are tilted downwards from the vertical center of the experimental chamber. The wastewater is then diverted downwards to both sides by the trapezoidal plate body composed of the second inclined plate and the second plate, and then seeps downwards into the mineralization adsorption layer through the mesh 2 on the second plate on both sides. Wastewater that seeps into the mineralized adsorption layer is cleared by the adsorption fillers such as zeolite and steel slag, which further purify the wastewater. The purified wastewater in the mineralized adsorption layer flows onto the U-shaped confluence plate, and the wastewater is then re-converged to the bottom center of the U-shaped confluence plate. S5, the purified sewage collected at the bottom center of the U-shaped manifold flows into the outlet pipe, then flows into the water collection pipe group, and then enters the water collection tank through the water collection pipe group, thereby achieving sewage treatment and purification. S6, when water is distributed through the water distribution pipes on the upper side of each treatment experimental box, the dual-axis motor is controlled to run, causing the output shaft of the dual-axis motor to rotate back and forth. The output shaft of the dual-axis motor drives the adjusting screw connected to it to rotate. During the back and forth rotation of the adjusting screw, the thread relationship between the adjusting screw and the movable rod causes the movable rods on both sides to move towards each other or away from each other, thereby causing the connecting blocks on both sides to move towards each other or away from each other, and thus causing the water distribution pipes on both sides of the treatment experimental box to move towards each other or away from each other. This allows the water distribution pipes to move horizontally back and forth during the watering process, thereby enabling rapid and uniform watering of the floating plant filter bed. S7, during the horizontal reciprocating movement of the water distribution pipe, when the gear moves to contact the tooth assembly, the meshing relationship between the tooth assembly and the gear drives the water distribution pipe where the gear is located to rotate. Since the tooth assembly is evenly spaced, when the gear moves into the gap between the tooth assembly, the gear rotates in the opposite direction under the action of gravity, so that the water outlet on the lower side of the water distribution pipe is perpendicular to the ground again. Thus, through the cooperation between the gear and the tooth assembly, the water distribution pipe can rotate back and forth during the horizontal reciprocating movement, which can quickly, evenly and efficiently spray sewage onto the floating plant filter bed.

[0011] In summary, this application has at least one of the following beneficial technical effects compared with the prior art: Firstly, the standardized connection and stable assembly of the experimental chambers are achieved through pre-drilled mounting holes and bolt fixing on the base. This modular design allows the entire experimental unit system to be flexibly added, removed, or rearranged like building blocks, according to experimental needs (such as comparisons of different hydraulic loads and pollution loads). It avoids the disadvantages of traditional wetland experimental ponds, such as the time-consuming, labor-intensive, and immovable on-site construction. Researchers can quickly deploy a complete, customizable pilot-scale system in the work area, or combine multiple independent experimental chambers into different process series / parallel flows for comparative studies. This not only shortens the experimental preparation cycle and reduces the need for site modification, but also greatly facilitates future system upgrades and expansions.

[0012] Secondly, the internal structure employs a layered structure of inverted trapezoidal aerobic layers, trapezoidal anaerobic layers, and U-shaped mineralization layers. This is not a simple spatial stacking, but a sophisticated hydraulic flow design. Under gravity, wastewater first flows from both sides of the inverted trapezoidal structure towards the central plate, then seeps evenly through a mesh into the trapezoidal anaerobic layer, is subsequently diverted to both sides, and finally re-converges through the U-shaped plate. This process simulates and enhances the diffusion, collection, and redistribution processes of water flow in natural wetlands, effectively increasing hydraulic retention time and reducing the risk of short-circuiting. More importantly, this structure enables spatially graded treatment of pollutants: the aerobic nitrification layer concentrates on ammonia oxidation at the top, with the treated nitrate liquid flowing downwards in a concentrated manner; the trapezoidal structure of the anaerobic denitrification layer facilitates full contact between the diverted wastewater and the packing material, enabling denitrification in an anoxic environment; and the U-shaped mineralization layer at the bottom ultimately adsorbs phosphorus and stabilizes water quality. The functional layers are physically separated but hydraulically interconnected, creating a stable and efficient zoned reaction environment.

[0013] Third, the water distribution mechanism combines horizontal reciprocating movement with intermittent forward and reverse rotation. The horizontal movement ensures that the wastewater is evenly covered on the surface of the floating plant filter bed, avoiding local overload and uneven wetting caused by fixed water distribution points. The rotation of the water distribution pipe makes the outlet appear as a "fine rain spray," which greatly increases the contact area and falling time of water droplets with air. This significantly increases the dissolved oxygen content of the water during the water distribution stage, creating a favorable oxygen environment for the aerobic nitrification layer. This dynamic water distribution method can also continuously "disturb" the plant roots and surface substrate, preventing suspended matter from accumulating at fixed points to form a surface sealing layer. It is an effective physical means of preventing blockage at the front end of the wetland system.

[0014] Fourth, from the external water supply tank, pumps, and valves to the internal movable / rotating water distribution pipes and clearly stratified reaction zones, every component possesses measurable and adjustable characteristics. Researchers can precisely control the influent flow rate, water quality, and water distribution pattern (movement speed, rotation frequency), and can clearly observe and monitor the hydraulic and biochemical states of each treatment stage (aerobic, anaerobic, and mineralization) through the stratified structure. This high degree of controllability enables it to be used to systematically study the impact of single variables (such as filler type, plant species, hydraulic retention time, and carbon-nitrogen ratio) on wetland treatment performance, thereby conducting in-depth mechanistic investigations and optimizing process parameters. Compared to complex field wetlands or large-scale pilot-scale tests with difficult-to-control environmental factors, this device can provide reliable and repeatable experimental conditions in the laboratory or controlled site. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the layered processing mechanism of the present invention; Figure 3This is a schematic diagram of the internal cross-sectional structure of the rotary water distribution mechanism of the present invention; Figure 4 This is an enlarged structural diagram of point A in the present invention; Figure 5 This is an enlarged structural diagram of point B in the present invention; Figure 6 This is a schematic diagram of the planar structure of the present invention.

[0016] In the diagram: 101. Inclined plate one; 102. Flat plate one; 103. Strainer one; 104. Inclined plate two; 105. Flat plate two; 106. Strainer two; 107. U-shaped manifold; 108. Partition one; 109. Partition two; 110. Partition three; 111. Drain hole; 201. Processing test chamber; 202. Base; 203. Mounting hole; 204. Water outlet pipe; 205. Water outlet valve; 301. Sliding rail; 302. Sliding block; 303. Water distribution pipe; 304. Water outlet; 305. Water inlet valve; 306. Fixing plate; 307. Gear assembly; 308. Gear; 309. Fixing frame; 310. Connecting block; 311. Control seat; 312. Movable rod; 313. Adjusting screw; 314. Dual-axis motor. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figure 1 , 2 As shown in Figure 5, a modular wetland wastewater treatment experimental device and method includes a treatment experimental chamber 201. The treatment experimental chamber 201 is equipped with a stratified treatment mechanism, which is used to perform auxiliary stratified treatment on the water flow. The layered processing mechanism includes symmetrically arranged inclined plates 101 on the upper side inside the processing experimental chamber 201; a flat plate 102 is arranged between the bottom ends of the inclined plates 101; a mesh screen 103 is arranged in the middle of the flat plate 102; symmetrically arranged inclined plates 104 are arranged in the middle of the interior of the processing experimental chamber 201; a flat plate 105 is arranged at the bottom end of the inclined plates 104; a mesh screen 106 is arranged in the middle of the flat plate 105; and a U-shaped busbar 107 is arranged on the lower side inside the processing experimental chamber 201. The inclined plates 101 are arranged on both sides of the processing experimental chamber 201. The wall is inclined towards the vertical center of the treatment test box 201, and the inclined plate 204 is set in the middle of the treatment test box 201 from the vertical center of the treatment test box 201 towards the side wall of the treatment test box 201; the layered treatment mechanism also includes partitions 108 evenly spaced on the inclined plate 101, partitions 109 evenly spaced on the inclined plate 204, and multiple partitions 110 evenly spaced on both sides of the U-shaped manifold 107. Multiple drainage holes 111 are opened on the partitions 108, 109 and 110. The treatment test chamber 201 is also equipped with a rotating water distribution mechanism, which is used to distribute water to floating plants.

[0019] like Figure 3 , 4 As shown in Figure 5, the rotary water distribution mechanism includes two sliding rails 301 on the upper side of the treatment test chamber 201. Sliding blocks 302 are slidably arranged on both sides of the sliding rails 301. A water distribution pipe 303 is arranged between the sliding blocks 302 on the same side. Multiple water outlets 304 are arranged on the lower side of the water distribution pipe 303. Water inlet valves 305 are arranged at both ends of the water distribution pipe 303. The rotary water distribution mechanism also includes two fixed plates 306 on the upper side of the treatment test chamber 201. Multiple evenly spaced tooth groups 307 are arranged on both sides of the lower surface of the fixed plates 306. Gears 308 are arranged on both sides of the outer arc surface of the water distribution pipe 303. The gears 308 are meshed with the tooth groups 307.

[0020] like Figure 3 , 4As shown in Figure 5, the rotary water distribution mechanism also includes a fixed frame 309 mounted on the upper surface of the treatment test chamber 201. Connecting blocks 310 are slidably mounted on both sides of the fixed frame 309, and the connecting blocks 310 are connected and fixed to the water distribution pipe 303. A control seat 311 is mounted on the upper side of the fixed frame 309. Movable rods 312 are slidably mounted on both sides of the control seat 311. The ends of the movable rods 312 are connected and fixed to the connecting blocks 310. Adjusting screws 313 are rotatably mounted on both sides inside the control seat 311. The adjusting screws 313 are threadedly connected to the adjacent movable rods 312. A dual-axis motor 314 is mounted in the middle of the control seat 311. The output shaft of the dual-axis motor 314 is fixed to the adjacent adjusting screw 313 by a coupling.

[0021] like Figure 1 , 2 As shown, a water outlet pipe 204 is provided on the lower side of the treatment test chamber 201. Water outlet valves 205 are provided at both ends of the water outlet pipe 204. The water outlet 304 in the middle of the U-shaped manifold 107 is connected to the water outlet pipe 204. A base 202 is provided at the bottom of the treatment test chamber 201. Mounting holes 203 are provided at the four corners of the lower surface of the base 202.

[0022] A modular wetland wastewater treatment experimental method is described below: S1, multiple treatment test boxes 201 are neatly placed side by side in the reserved working area, and bolts are passed through the mounting holes 203 pre-drilled at the four corners of the lower surface of the base 202. Then, the bolts are tightened with external tools to fix the position of the treatment test boxes 201, so that the neatly arranged treatment test boxes 201 can be modularly assembled into a whole artificial wetland sewage treatment experimental unit system. S2, a mineralization adsorption layer (composed of zeolite, steel slag and other adsorption fillers) is laid on the U-shaped manifold 107 at the bottom. The uniform laying of the mineralization adsorption layer is facilitated by the partitions 110 evenly arranged on both sides of the U-shaped manifold 107. An anaerobic denitrification layer (composed of special modified biochar fillers) is laid on the trapezoidal plate composed of inclined plate 104 and flat plate 105 in the middle. The uniform laying of the anaerobic denitrification layer is facilitated by the partitions 109 evenly arranged on both sides of the inclined plate 104. An aerobic nitrification layer (composed of sand, gravel and crushed stone) is laid on the inverted trapezoidal plate composed of inclined plate 101 and flat plate 102 on the upper side. Then, plants with strong oxygen-secreting capacity, such as water celery, are planted on the aerobic nitrification layer to form a floating plant filter bed. S3, the water pump installed on the external water supply tank is connected to the inlet valve 305 installed on each treatment experimental box 201 through the water supply pipe group, and then the water collection pipe group installed on the water collection tank is connected to the outlet valve 205 installed on each treatment experimental box 201, so that the water source in the external water supply tank is transported into the water distribution pipe 303 installed on each treatment experimental box 201 through the water supply pipe group under the action of the water pump, and the sewage is evenly sprayed on the floating plant filter bed like a drizzle through the outlet 304 installed on the water distribution pipe 303. S4, wastewater sprayed from the water distribution pipe 303 enters the aerobic nitrification layer through the floating plant filter bed. During this process, the floating plant filter bed removes nitrogen, adjusts pH and removes phosphorus. Wastewater entering the aerobic nitrification layer undergoes enhanced nitrification. The wastewater reacted within the aerobic nitrification layer continuously seeps down until it settles on the inclined plate 101. Then, it flows through the inclined plate 101, which is tilted towards the vertical center of the treatment test chamber 201, to the plate 102 located above the vertical center of the treatment test chamber 201. It then seeps downwards through the mesh 103 set on the plate 102 into the trapezoidal plate body composed of the inclined plate 104 and the plate 105, where the anaerobic denitrification layer is laid. This allows the wastewater treated by the aerobic nitrification layer to collect in the upper middle part of the treatment test chamber 201 under the action of the inverted trapezoidal plate body composed of the inclined plate 101 and the plate 102, and then seeps downwards into the anaerobic denitrification layer through the mesh 103. Wastewater infiltrating into the anaerobic denitrification layer undergoes a denitrification reaction under the action of special modified biochar packing, further treating the wastewater. After being treated in the anaerobic denitrification layer, the wastewater falls onto inclined plate 104. The wastewater in the middle is diverted to both sides by two symmetrically distributed inclined plates 104 that are tilted downward from the vertical center of the experimental chamber. The wastewater is then diverted downward to both sides by the trapezoidal plate composed of inclined plate 104 and plate 105, and then seeps downward into the mineralization adsorption layer through the mesh 106 on the plate 105 on both sides. Wastewater that seeps into the mineralized adsorption layer is cleared by the adsorption fillers such as zeolite and steel slag, which further purify the wastewater. The purified wastewater in the mineralized adsorption layer flows onto the U-shaped manifold 107, and the wastewater is re-converged to the middle of the bottom of the U-shaped manifold 107. S5, the purified sewage collected at the bottom center of the U-shaped manifold 107 flows into the outlet pipe 204, then flows from the outlet pipe 204 into the water collection pipe group, and then enters the interior of the water collection tank through the water collection pipe group, thereby achieving sewage treatment and purification. S6, when the water distribution pipe 303 on the upper side of each treatment experimental box 201 distributes water, the dual-axis motor 314 is controlled to run, so that the output shaft of the dual-axis motor 314 rotates back and forth. The output shaft of the dual-axis motor 314 drives the adjusting screw 313 connected to it to rotate. During the back and forth rotation of the adjusting screw 313, the thread relationship between the adjusting screw 313 and the movable rod 312 drives the movable rods 312 on both sides to move towards each other or away from each other, thereby driving the connecting blocks 310 on both sides to move towards each other or away from each other, thereby driving the water distribution pipes 303 on both sides of the treatment experimental box 201 to move towards each other or away from each other, so that the water distribution pipes 303 move horizontally back and forth during the watering process, thereby enabling rapid and uniform watering of the floating plant filter bed. S7, during the horizontal reciprocating movement of the water distribution pipe 303, when the gear 308 moves to contact the toothed assembly 307, the meshing relationship between the toothed assembly 307 and the gear 308 drives the water distribution pipe 303 where the gear 308 is located to rotate. Since the toothed assembly 307 is evenly spaced, when the gear 308 moves into the gap between the toothed assembly 307, the gear 308 rotates in the opposite direction under the action of gravity, so that the outlet 304 on the lower side of the water distribution pipe 303 is perpendicular to the ground again. Thus, through the cooperation between the gear 308 and the toothed assembly 307, the water distribution pipe 303 can rotate back and forth during the horizontal reciprocating movement, which can quickly, evenly and efficiently spray sewage onto the floating plant filter bed.

[0023] During use, multiple treatment test boxes 201 are neatly placed side by side in the reserved working area, and bolts are passed through the mounting holes 203 pre-drilled at the four corners of the lower surface of the base 202. Then, the bolts are tightened with external tools to fix the position of the treatment test boxes 201, so that the neatly arranged treatment test boxes 201 can be modularly assembled into a complete artificial wetland wastewater treatment experimental unit system. A mineralization adsorption layer (composed of zeolite, steel slag and other adsorption fillers) is laid on the U-shaped manifold 107 at the bottom. The uniform laying of the mineralization adsorption layer is facilitated by partitions 3 110 evenly arranged on both sides of the U-shaped manifold 107. An anaerobic denitrification layer (composed of special modified biochar fillers) is laid on the trapezoidal plate composed of inclined plate 2 104 and flat plate 2 105 in the middle. The uniform laying of the anaerobic denitrification layer is facilitated by partitions 2 109 evenly arranged on both sides of the inclined plate 2 104. An aerobic nitrification layer (composed of sand, gravel and crushed stone) is laid on the inverted trapezoidal plate composed of inclined plate 1 101 and flat plate 102 on the upper side. Then, plants with strong oxygen-secreting capacity, such as water celery, are planted on the aerobic nitrification layer to form a floating plant filter bed. The water pump installed on the external water supply tank is connected to the inlet valve 305 installed on each treatment experimental box 201 through the water supply pipe assembly. Then, the water collection pipe assembly installed on the water collection tank is connected to the outlet valve 205 installed on each treatment experimental box 201. This allows the water source in the external water supply tank to be transported into the water distribution pipe 303 installed on each treatment experimental box 201 through the water supply pipe assembly under the action of the water pump. Through the water outlet 304 installed on the water distribution pipe 303, the sewage is evenly sprayed onto the floating plant filter bed like a drizzle. Wastewater sprayed from the water distribution pipe 303 enters the aerobic nitrification layer through the floating plant filter bed. During this process, the floating plant filter bed removes nitrogen, adjusts pH, and removes phosphorus. Wastewater entering the aerobic nitrification layer undergoes enhanced nitrification. The wastewater reacted within the aerobic nitrification layer continuously seeps down until it settles on the inclined plate 101. Then, it flows through the inclined plate 101, which is tilted towards the vertical center of the treatment test chamber 201, to the plate 102 located above the vertical center of the treatment test chamber 201. It then seeps downwards through the mesh 103 set on the plate 102 into the trapezoidal plate body composed of the inclined plate 104 and the plate 105, where the anaerobic denitrification layer is laid. This allows the wastewater treated by the aerobic nitrification layer to collect in the upper middle part of the treatment test chamber 201 under the action of the inverted trapezoidal plate body composed of the inclined plate 101 and the plate 102, and then seeps downwards into the anaerobic denitrification layer through the mesh 103. Wastewater infiltrating into the anaerobic denitrification layer undergoes a denitrification reaction under the action of special modified biochar packing, further treating the wastewater. After being treated in the anaerobic denitrification layer, the wastewater falls onto inclined plate 104. The wastewater in the middle is diverted to both sides by two symmetrically distributed inclined plates 104 that are tilted downward from the vertical center of the experimental chamber. The wastewater is then diverted downward to both sides by the trapezoidal plate composed of inclined plate 104 and plate 105, and then seeps downward into the mineralization adsorption layer through the mesh 106 on the plate 105 on both sides. Wastewater that seeps into the mineralized adsorption layer is cleared by the adsorption fillers such as zeolite and steel slag, which further purify the wastewater. The purified wastewater in the mineralized adsorption layer flows onto the U-shaped manifold 107, and the wastewater is re-converged to the middle of the bottom of the U-shaped manifold 107. The purified sewage collected at the bottom center of the U-shaped manifold 107 flows into the outlet pipe 204, then flows from the outlet pipe 204 into the water collection pipe group, and then enters the interior of the water collection tank through the water collection pipe group, thereby achieving sewage treatment and purification. When the water distribution pipe 303 on the upper side of each treatment experimental box 201 distributes water, the dual-axis motor 314 is controlled to run, so that the output shaft of the dual-axis motor 314 rotates back and forth. The output shaft of the dual-axis motor 314 drives the adjusting screw 313 connected to it to rotate. During the back and forth rotation of the adjusting screw 313, the thread relationship between the adjusting screw 313 and the movable rod 312 drives the movable rods 312 on both sides to move towards each other or away from each other, thereby driving the connecting blocks 310 on both sides to move towards each other or away from each other, thereby driving the water distribution pipes 303 on both sides of the treatment experimental box 201 to move towards each other or away from each other, so that the water distribution pipes 303 move horizontally back and forth during the watering process, thereby enabling rapid and uniform watering of the floating plant filter bed. During the horizontal reciprocating movement of the water distribution pipe 303, when the gear 308 moves to contact the toothed assembly 307, the meshing relationship between the toothed assembly 307 and the gear 308 drives the water distribution pipe 303 where the gear 308 is located to rotate. Since the toothed assembly 307 is evenly spaced, when the gear 308 moves into the gap between the toothed assembly 307, the gear 308 rotates in the opposite direction under the action of gravity, so that the outlet 304 on the lower side of the water distribution pipe 303 is perpendicular to the ground again. Thus, through the cooperation between the gear 308 and the toothed assembly 307, the water distribution pipe 303 can rotate back and forth during the horizontal reciprocating movement, which can quickly, evenly and efficiently spray sewage onto the floating plant filter bed.

[0024] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles 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 modular wetland wastewater treatment experimental device, comprising a treatment experimental chamber (201), characterized in that: The processing test chamber (201) is equipped with a layered processing mechanism inside, which is used to perform auxiliary graded processing on the water flow. The layered processing mechanism includes an inclined plate 1 (101) symmetrically arranged on the upper side inside the processing experimental box (201), a flat plate 1 (102) arranged between the bottom ends of the inclined plate 1 (101), a mesh 1 (103) arranged in the middle of the flat plate 1 (102), an inclined plate 2 (104) symmetrically distributed in the middle of the inside of the processing experimental box (201), a flat plate 2 (105) arranged at the bottom end of the inclined plate 2 (104), a mesh 2 (106) arranged in the middle of the flat plate 2 (105), and a U-shaped busbar 107 arranged on the lower side inside the processing experimental box (201). The first inclined plate (101) is set on the inner walls of both sides of the processing test box (201) and tilts downward toward the vertical center of the processing test box (201). The second inclined plate (104) is set in the middle of the processing test box (201) and tilts downward toward the side wall of the processing test box (201) from the vertical center of the processing test box (201). A mineralization adsorption layer is laid on the U-shaped manifold (107) at the bottom. The mineralization adsorption layer is composed of adsorption filler. The uniform laying of the mineralization adsorption layer is facilitated by the partitions three (110) evenly arranged on both sides of the U-shaped manifold (107). An anaerobic denitrification layer is laid on the plate body composed of the inclined plate two (104) and the flat plate two (105) in the middle. The anaerobic denitrification layer is composed of modified biochar filler. The uniform laying of the anaerobic denitrification layer is facilitated by the partitions two (109) evenly arranged on the inclined plate two (104) on both sides. An aerobic nitrification layer is laid on the inverted trapezoidal plate body composed of the inclined plate one (101) and the flat plate one (102) on the upper side. The aerobic nitrification layer is composed of sand, gravel and crushed stone. Then, plants with strong oxygen secretion capacity are planted on the aerobic nitrification layer to form a floating plant filter bed. The treatment experimental box (201) is also equipped with a rotary water distribution mechanism, which is used to distribute water to floating plants. The rotary water distribution mechanism includes two sliding rails (301) on the upper side of the treatment test box (201), sliding blocks (302) are slidably arranged on both sides of the sliding rails (301), and a water distribution pipe (303) is arranged between the sliding blocks (302) on the same side. Multiple water outlets (304) are arranged on the lower side of the water distribution pipe (303), and water inlet valves (305) are arranged at both ends of the water distribution pipe (303). The rotary water distribution mechanism also includes two fixed plates (306) set on the upper side of the treatment test box (201). Multiple tooth groups (307) are provided on both sides of the lower surface of the fixed plates (306). Gears (308) are provided on both sides of the outer arc surface of the water distribution pipe (303). The gears (308) are meshed with the tooth groups (307).

2. The modular wetland wastewater treatment experimental device as described in claim 1, characterized in that: The layered processing mechanism also includes a partition plate 1 (108) evenly spaced on the inclined plate 1 (101), a partition plate 2 (109) evenly spaced on the inclined plate 2 (104), and a plurality of partition plates 3 (110) evenly spaced on both sides of the U-shaped confluence plate (107). A plurality of drainage holes (111) are provided on the partition plate 1 (108), partition plate 2 (109) and partition plate 3 (110).

3. The modular wetland wastewater treatment experimental device as described in claim 1, characterized in that: The rotary water distribution mechanism also includes a fixed frame (309) set on the upper surface of the treatment test box (201). Connecting blocks (310) are slidably arranged on both sides of the fixed frame (309), and the connecting blocks (310) are connected and fixed to the water distribution pipe (303).

4. The modular wetland wastewater treatment experimental device as described in claim 3, characterized in that: A control seat (311) is provided on the upper side of the fixed frame (309). Movable rods (312) are slidably provided on both sides of the control seat (311). The ends of the movable rods (312) are connected and fixed to the connecting block (310). Adjusting screws (313) are rotatably provided on both sides inside the control seat (311). The adjusting screws (313) are threadedly connected to the adjacent movable rods (312). A dual-axis motor (314) is provided in the middle of the control seat (311). The output shaft of the dual-axis motor (314) is fixed to the adjacent adjusting screws (313) by a coupling.

5. The modular wetland wastewater treatment experimental device as described in claim 1, characterized in that: The lower side of the treatment test box (201) is provided with a water outlet pipe (204), and water outlet valves (205) are provided at both ends of the water outlet pipe (204). The water outlet in the middle of the U-shaped manifold (107) is connected to the water outlet pipe (204). The bottom of the treatment test box (201) is provided with a base (202), and mounting holes (203) are provided at the four corners of the lower surface of the base (202).

6. A modular wetland wastewater treatment experimental method, characterized in that, The method employs the modular wetland wastewater treatment experimental device as described in any one of claims 1-5, and the method of use is as follows: S1, multiple treatment test boxes (201) are neatly placed side by side in the reserved working area, and the bolts are passed through the mounting holes (203) pre-drilled at the four corners of the lower surface of the base (202). Then, the bolts are tightened with external tools to fix the position of the treatment test boxes (201), so that the neatly arranged treatment test boxes (201) form a complete artificial wetland sewage treatment experimental unit system. S2, a mineralization adsorption layer is laid on the U-shaped manifold (107) at the bottom layer. The mineralization adsorption layer is composed of adsorption filler. The uniform laying of the mineralization adsorption layer is facilitated by the partitions three (110) evenly arranged on both sides of the U-shaped manifold (107). An anaerobic denitrification layer is laid on the plate body composed of the inclined plate two (104) and the flat plate two (105) in the middle. The anaerobic denitrification layer is composed of modified biochar filler. The uniform laying of the anaerobic denitrification layer is facilitated by the partitions two (109) evenly arranged on both sides of the inclined plate two (104). An aerobic nitrification layer is laid on the inverted trapezoidal plate body composed of the inclined plate one (101) and the flat plate one (102) on the upper side. The aerobic nitrification layer is composed of sand, gravel and crushed stone. Then, plants with strong oxygen secretion capacity are planted on the aerobic nitrification layer to form a floating plant filter bed. S3, the water pump installed on the external water supply tank is connected to the inlet valve (305) installed on each treatment experimental box (201) through the water supply pipe group, and then the water collection pipe group installed on the water collection tank is connected to the outlet valve (205) installed on each treatment experimental box (201), so that the water source in the external water supply tank is transported into the water distribution pipe (303) installed on each treatment experimental box (201) through the water supply pipe group under the action of the water pump, and the sewage is evenly sprayed on the floating plant filter bed like a drizzle through the outlet (304) installed on the water distribution pipe (303); S4, wastewater sprayed from the water distribution pipe (303) enters the aerobic nitrification layer from the floating plant filter bed. During this process, the floating plant filter bed removes nitrogen, adjusts pH and removes phosphorus. Wastewater entering the aerobic nitrification layer undergoes enhanced nitrification. The wastewater reacted in the aerobic nitrification layer continuously seeps down until it flows onto the inclined plate one (101). Then, it flows through the inclined plate one (101) tilted towards the vertical center of the treatment experimental tank (201) to the plate one (102) located above the vertical center of the treatment experimental tank (201). Then, it seeps downward through the mesh one (103) set on the plate one (102) into the anaerobic denitrification layer laid on the plate body composed of the inclined plate two (104) and the plate two (105). This causes the wastewater treated by the aerobic nitrification layer to collect in the upper middle part of the treatment experimental tank (201) under the action of the inverted trapezoidal plate body composed of the inclined plate one (101) and the plate one (102). Then, it seeps downward into the anaerobic denitrification layer through the mesh one (103). Wastewater infiltrating into the anaerobic denitrification layer undergoes denitrification under the action of modified biochar packing, further treating the wastewater. After being treated in the anaerobic denitrification layer, the wastewater falls onto the inclined plate two (104). The wastewater in the middle is diverted to both sides by two symmetrically distributed inclined plates two (104) tilted downwards from the vertical center of the self-treatment experimental box. The wastewater is then diverted downwards to both sides by the plate body composed of inclined plate two (104) and plate two (105), and then seeps downwards into the mineralization adsorption layer through the mesh two (106) on the plate two (105) on both sides. The wastewater that seeps into the mineralized adsorption layer is further purified by the adsorption packing. The wastewater purified in the mineralized adsorption layer flows onto the U-shaped confluence plate (107), and the wastewater is re-converged to the middle of the bottom of the U-shaped confluence plate (107) through the U-shaped confluence plate (107). S5, the purified sewage collected at the bottom center of the U-shaped manifold (107) flows into the outlet pipe (204), then flows from the outlet pipe (204) into the water collection pipe group, and then enters the interior of the water collection tank through the water collection pipe group, thereby realizing the purification of sewage treatment; S6, when water is distributed through the water distribution pipe (303) on the upper side of each treatment experimental box (201), the dual-axis motor (314) is controlled to run, so that the output shaft of the dual-axis motor (314) rotates back and forth. The output shaft of the dual-axis motor (314) drives the adjusting screw (313) connected to it to rotate. During the back and forth rotation of the adjusting screw (313), the thread relationship between the adjusting screw (313) and the movable rod (312) drives the movable rods (312) on both sides to move towards each other or away from each other, thereby driving the connecting blocks (310) on both sides to move towards each other or away from each other, thereby driving the water distribution pipes (303) on both sides of the treatment experimental box (201) to move towards each other or away from each other, so that the water distribution pipes (303) move horizontally back and forth during the watering process, thereby enabling rapid and uniform watering of the floating plant filter bed. S7, during the horizontal reciprocating movement of the water distribution pipe (303), when the gear (308) moves to contact the toothed assembly (307), the meshing relationship between the toothed assembly (307) and the gear (308) drives the water distribution pipe (303) where the gear (308) is located to rotate. Since the toothed assembly (307) is evenly spaced, when the gear (308) moves to the gap between the toothed assembly (307), the gear (308) rotates in the opposite direction under the action of gravity, so that the outlet (304) on the lower side of the water distribution pipe (303) is perpendicular to the ground again. Thus, through the cooperation between the gear (308) and the toothed assembly (307), the water distribution pipe (303) can rotate back and forth during the horizontal reciprocating movement, which can quickly, evenly and efficiently spray sewage onto the floating plant filter bed.

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