Edible ornamental mixed type lake composite diversified wetland module and construction method

Abstract

This invention discloses a mixed-use (edible and ornamental) lake composite diverse wetland module and its construction method, relating to the field of wetland ecological engineering technology. It includes a primary purification unit located on the lake shoreline, a deep purification and resource production unit located in the open water area of ​​the lake, and a hydraulic connection system connecting the primary purification unit and the deep purification and resource production unit. This mixed-use (edible and ornamental) lake composite diverse wetland module and its construction method connects surface flow wetland units and horizontal subsurface flow wetland units in series to form a primary purification unit. This unit is then spatially combined and hydraulically connected with an aquatic vegetable-type floating island wetland constructed based on a bamboo frame, netting, vegetable rotation ponds, and supporting bamboo poles. A directional water flow path including an inlet area, a wedge-shaped distribution channel, and a collection pipe is also provided. This constructs a three-dimensional composite purification system integrating primary interception, deep purification, and resource production, achieving synergy between water purification efficiency and edible plant resource production.

Description

Technical Field

[0001] This invention relates to the field of wetland ecological engineering technology, specifically to a mixed-use (edible and ornamental) lake composite diversified wetland module and its construction method. Background Technology

[0002] With the continuous development of environmental science and engineering technology, wetland ecological engineering is playing an increasingly important role in controlling water pollution and restoring ecosystem functions. Surface flow wetlands and horizontal subsurface flow wetlands, as two typical wetland types, have shown remarkable effectiveness in treating eutrophic water bodies and removing pollutants such as nitrogen and phosphorus due to their unique purification mechanisms. At the same time, the introduction of edible and ornamental plants into wetland systems not only enriches the biodiversity of wetlands but also enhances their landscape aesthetic value and resource utilization efficiency. In particular, the cultivation of aquatic vegetables provides new ideas for the resource utilization of wetland pollutants.

[0003] However, in existing technologies, how to achieve the coupling of efficient water purification and high-yield, high-quality edible plants remains a problem that needs to be solved. Currently, most wetland systems are designed with an emphasis on enhancing the single purification function of the wetland, such as strengthening the removal capacity of nitrogen and phosphorus, while neglecting the specific growth needs and nutrient absorption characteristics of edible plants during the water purification process. This design deviation restricts the growth of edible plants in the wetland system, and the yield and quality cannot reach the optimal state, thereby weakening the overall economic benefits and resource recycling efficiency of the wetland. In particular, in the combined surface flow wetland and floating island wetland system, due to the lack of refined design and control of water flow path, plant configuration and hydraulic load, the distribution of nutrients in the system is uneven, making it difficult to meet the needs of continuous and efficient growth of edible plants. This directly limits the simultaneous improvement of wetland system in terms of water purification efficiency and resource output, and therefore needs to be improved. Summary of the Invention

[0004] The purpose of this invention is to provide a mixed-use (edible and ornamental) lake composite diverse wetland module and its construction method, in order to solve the problem in the prior art that it is difficult to achieve a precise balance and efficient synergy between water purification efficiency and edible plant resource output in wetland systems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a mixed-use (edible and ornamental) lake composite diversified wetland module, comprising a primary purification unit set in the lake shoreline, a deep purification and resource production unit set in the open water area of ​​the lake, and a hydraulic connection system connecting the primary purification unit and the deep purification and resource production unit. The primary purification unit is a composite wetland composed of a surface flow wetland unit and a horizontal subsurface flow wetland unit connected in series. The deep purification and resource production unit is an aquatic vegetable floating island wetland. The aquatic vegetable floating island wetland is set downstream of the primary purification unit. The aquatic vegetable floating island wetland includes a bamboo frame, on which netting is fixed to form a floating island platform. Vegetable rotation ponds for planting vegetables are fixed on the floating island platform by supporting bamboo poles, and the roots of the vegetables extend into the water.

[0006] The hydraulic connection system includes an inlet area and an outlet area. The inlet area is connected to a wedge-shaped water distribution trough via an inlet pipe. The wedge-shaped water distribution trough is connected to the vegetable rotation pond. The vegetable rotation pond is connected to the outlet area via a water collection pipe and is equipped with an overflow pipe.

[0007] Furthermore, an integrated transition unit for cascading reoxygenation and particulate matter interception is provided between the water inlet pipe and the wedge-shaped water distribution channel of the aquatic vegetable floating island wetland; the integrated transition unit for cascading reoxygenation and particulate matter interception includes a stepped cascading weir and a detachable interception buffer box located below the cascading weir, and the interception buffer box is equipped with a filter screen frame.

[0008] Furthermore, the upper side wall of the interception buffer tank is provided with an overflow port, which is connected to the water outlet area through a bypass pipe.

[0009] Furthermore, the bamboo frame of the aquatic vegetable-type floating island wetland is fixed to the bottom of the lake through a master-slave flexible hinge-multi-point rigid anchoring composite anchoring system; the composite anchoring system includes flexible hinged connecting rods connecting adjacent floating island units, rigid anchor piles fixed below the main floating island unit, and elastic mooring cables connecting the slave floating island units to the main floating island or anchor piles.

[0010] Furthermore, metal reinforcing clamps are provided at the intersection binding nodes of the bamboo poles of the bamboo frame.

[0011] Furthermore, the plants grown in the primary purification unit include vegetable plants and landscape plants; the vegetable plants include at least one of water spinach, mint, tomato, and water celery; the landscape plants include at least one of reed, calamus, canna, and thalia.

[0012] Furthermore, the vegetables grown in the aquatic vegetable-type floating island wetland include at least one of water bamboo, water spinach, arrowhead, and water caltrop.

[0013] Furthermore, the horizontal subsurface flow wetland unit of the primary purification unit is equipped with a flow guiding and silt flushing device, which is a flow guiding channel with a slope.

[0014] A method for constructing a mixed-use (edible and ornamental) lake complex with diverse wetland features includes the following steps:

[0015] S1. Construct a composite wetland as a primary purification unit on the shoreline of the lake. This composite wetland is composed of surface flow wetland units and horizontal subsurface flow wetland units connected in series.

[0016] S2. In the open waters of the lake, located downstream of the primary purification unit, construct an aquatic vegetable-type floating island wetland as a deep purification and resource production unit; use bamboo to make a frame, fix netting on the frame to form a platform, fix vegetable rotation ponds on the platform by supporting bamboo poles, and grow vegetables in the ponds.

[0017] S3. Configure a hydraulic connection system connecting the primary purification unit and the deep purification and resource production unit to form a water flow path that flows sequentially through the water inlet area, water inlet pipe, wedge-shaped water distribution trough, the vegetable rotation pond, water collection pipe to the water outlet area, and set an overflow pipe.

[0018] Furthermore, in step S3, an integrated transition unit for cascading reoxygenation and particulate matter interception is installed between the water inlet pipe and the wedge-shaped water distribution channel; in step S2, after constructing the aquatic vegetable-type floating island wetland, a master-slave flexible hinge-multi-point rigid anchoring composite anchoring system is used to anchor the floating island unit as a whole.

[0019] Compared with existing technologies, the present invention provides a multi-functional lake wetland module and construction method that combines edible and ornamental features. By connecting surface flow wetland units and horizontal subsurface flow wetland units in series to form a primary purification unit, and spatially combining and hydraulically connecting it with an aquatic vegetable floating island wetland constructed based on a bamboo frame, netting, vegetable rotation ponds, and supporting bamboo poles, a directional water flow path including an inlet area, a wedge-shaped water distribution channel, and a water collection pipe is set up. This creates a three-dimensional composite purification system that integrates primary interception, deep purification, and resource production, achieving a highly efficient synergy between water purification efficiency and edible plant resource production.

[0020] By setting up an integrated transition unit for cascading reoxygenation and particulate matter interception between the water inlet pipe and the wedge-shaped water distribution channel of the floating island wetland, the effluent from the primary purification unit is effectively reoxygenated, and any fine suspended particles that may be carried are intercepted. This optimizes the water quality conditions entering the deep purification unit, prevents blockage in the floating island area, and enhances the efficiency of the subsequent biological purification process.

[0021] By employing a master-slave flexible articulated-multi-point rigid anchoring composite anchoring system, which includes flexible articulated connecting rods, rigid anchor piles, and elastic mooring cables, and by reinforcing the bamboo frame nodes with metal clamps, the aquatic vegetable-type floating island wetland unit can maintain overall positional stability in open waters and flexibly dissipate wind and wave energy. This significantly improves the floating island system's wind and wave resistance, structural durability, and long-term operational reliability in dynamic lake environments.

[0022] By installing a flow-guiding and silt-flushing device with a gradient inside the horizontal subsurface flow wetland unit of the primary purification unit, the local high-speed flushing channel is formed by the gravity of the water flow, thereby effectively alleviating the clogging problem of the subsurface flow matrix layer and maintaining the stability of the wetland system's hydraulic conductivity and long-term purification function.

[0023] By combining specific types of vegetable plants with landscape plants in the primary purification unit, and rotating various aquatic vegetables in the floating island unit, a complementary plant community is constructed. This not only efficiently absorbs pollutants such as nitrogen and phosphorus, but also beautifies the lakeside landscape and realizes the resource transformation of pollutants, taking into account ecological benefits, landscape benefits and potential economic benefits. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0025] Figure 1 A flowchart of the method provided in an embodiment of the present invention;

[0026] Figure 2 This is a diagram illustrating the structure of a wetland module provided in an embodiment of the present invention.

[0027] Figure 3 This is a diagram illustrating a wetland module provided in an embodiment of the present invention.

[0028] Figure 4 This is a technical diagram of a wetland module provided in an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of a vegetable-landscape plant surface flow-horizontal subsurface flow composite wetland provided in an embodiment of the present invention;

[0030] Figure 6 A cross-sectional view of an aquatic vegetable-type floating island wetland provided in an embodiment of the present invention;

[0031] Figure 7 A plan view of a hydroponic vegetable floating island wetland provided in an embodiment of the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Water inlet area; 2. Water inlet pipe; 3. Wedge-shaped water distribution trough; 4. Vegetable rotation pond; 5. Water collection pipe; 6. Overflow pipe; 7. Water outlet area; 8. Vegetables; 9. Root system; 10. Supporting bamboo poles; 11. Moso bamboo frame; 12. Netting. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] As attached Figure 1 To be continued Figure 7 As shown:

[0036] Example 1:

[0037] This invention provides a mixed-use (edible and ornamental) lake composite wetland module and its construction method, including a primary purification unit set in the lake shoreline, a deep purification and resource production unit set in the open water of the lake, and a hydraulic connection system connecting the primary purification unit and the deep purification and resource production unit. The primary purification unit is a composite wetland composed of a surface flow wetland unit and a horizontal subsurface flow wetland unit connected in series. The deep purification and resource production unit is an aquatic vegetable floating island wetland. The aquatic vegetable floating island wetland is set downstream of the primary purification unit. The aquatic vegetable floating island wetland includes a bamboo frame 11, on which a net 12 is fixed to form a floating island platform. On the floating island platform, a vegetable rotation pond 4 for planting vegetables 8 is fixed by supporting bamboo poles 10. The root system 9 of the vegetables 8 extends into the water.

[0038] The hydraulic connection system includes an inlet zone 1 and an outlet zone 7. The inlet zone 1 is connected to the wedge-shaped water distribution channel 3 through the inlet pipe 2. The wedge-shaped water distribution channel 3 is connected to the vegetable rotation pond 4. The vegetable rotation pond 4 is connected to the outlet zone 7 through the water collection pipe 5 and is equipped with an overflow pipe 6.

[0039] A cascading reoxygenation-particulate matter interception integrated transition unit is provided between the water inlet pipe 5 and the wedge-shaped water distribution channel 3 of the aquatic vegetable floating island wetland. The cascading reoxygenation-particulate matter interception integrated transition unit includes a stepped cascading weir and a detachable interception buffer box located below the cascading weir. The interception buffer box is equipped with a filter screen frame, and the upper part of the side wall of the interception buffer box is equipped with an overflow port, which is connected to the outlet area 7 through a bypass pipe. The bamboo frame 11 of the aquatic vegetable floating island wetland is fixed to the bottom of the lake through a master-slave flexible hinge-multi-point rigid anchoring composite anchoring system. The composite anchoring system includes flexible hinged connecting rods connecting adjacent floating island units and fixed below the main floating island unit. The rigid anchor piles and the elastic mooring cables connecting the floating island unit to the main floating island or anchor piles are provided. Metal reinforcing clamps are set at the cross binding nodes of the bamboo poles of the bamboo frame 11. The plants planted in the primary purification unit include vegetable plants and landscape plants. Vegetable plants include at least one of water spinach, mint, tomato and water celery. Landscape plants include at least one of reed, calamus, canna and canna lily. The vegetables planted in the aquatic vegetable floating island wetland include at least one of water chestnut, water spinach, arrowhead and water caltrop. The horizontal subsurface flow wetland unit of the primary purification unit is equipped with a flow diversion and silt flushing device, which is a flow diversion channel with a slope.

[0040] The primary purification unit is constructed on the gentle slope of the target lake's shoreline, consisting of a series of surface flow wetland units and horizontal subsurface flow wetland units. The horizontal subsurface flow wetland units are located in the lower layer, filled with a mixture of gravel, sand, and ceramsite to form subsurface flow channels. The surface flow wetland units are located in the upper layer, connecting to the hydraulic outlets of the horizontal subsurface flow wetland units to create an open water surface. Within the horizontal subsurface flow wetland units, there are guide channels with a certain slope (e.g., 1%-3%) filled with clean pebbles or ceramic blocks, forming a flow diversion and siltation device.

[0041] The advanced purification and resource production unit is located in the open waters of the lake, downstream of the primary purification unit, in an aquatic vegetable-type floating island wetland. Its specific structure includes:

[0042] The floating structure is made of mature bamboo with a diameter of 8-12 cm, forming a rectangular or square bamboo frame 11 with a frame size of 2m × 3m or 3m × 4m. High-strength polyethylene mesh 12 with a mesh size of 2cm × 2cm is fixed to the upper surface and all sides of the frame to form a floating island platform and planting enclosure structure.

[0043] The planting structure uses lightweight plastic planting baskets or custom-made fiberglass troughs as vegetable rotation ponds 4, with holes at the bottom for root growth. The vegetable rotation ponds 4 are vertically fixed to a predetermined position above the bamboo frame 11 by supporting bamboo poles 10.

[0044] The anchoring system consists of a bamboo frame 11 fixed to the lake bottom via a master-slave flexible hinge-multi-point rigid anchoring composite anchoring system. Specifically, adjacent floating island units are flexibly connected by connecting rods with swivel joints; one unit is selected as the master floating island unit, and concrete or steel piles are driven diagonally below its key frame nodes as rigid anchor piles; the remaining secondary floating island units are connected to the master floating island or anchor piles via nylon or polypropylene mooring cables. U-shaped galvanized steel clamps are added for reinforcement at each bamboo pole cross-binding node of the bamboo frame 11.

[0045] The hydraulic connection system is used to connect the primary purification unit and the advanced purification and resource production unit in series, forming a directional water flow path. It includes:

[0046] Main path: Water inlet 1 is connected to wedge-shaped water distribution channel 3 through water inlet pipe 2. Wedge-shaped water distribution channel 3 is connected to vegetable rotation pond 4. Vegetable rotation pond 4 is connected to water outlet 7 through water collection pipe 5.

[0047] Safety relief: An overflow pipe 6 is provided in the system.

[0048] Transition Unit: Between the water inlet pipe 5 (specifically referring to the pipe after water collection from the primary purification unit) and the wedge-shaped water distribution channel 3 of the aquatic vegetable-type floating island wetland, there is an integrated transition unit for cascading reoxygenation and particulate matter interception. This unit consists of a stepped cascading weir and a detachable interception buffer tank located below it. The buffer tank is equipped with a filter screen frame with a pore size of 2-5 mm, and the upper side wall of the tank is equipped with an overflow port connected to the outlet area 7 through a bypass pipe.

[0049] Plant arrangement:

[0050] In the primary purification unit, the vegetable plants planted include at least one of water spinach, mint, tomato, and water celery, while the landscape plants include at least one of reeds, calamus, canna lily, and thalia elata.

[0051] In the vegetable rotation pond 4 of the deep purification and resource production unit, the vegetables grown include at least one of water bamboo, water spinach, arrowhead, and water caltrop.

[0052] The wetland module's workflow is as follows: The water to be treated flows sequentially through the inlet area 1 and inlet pipe 2, and is evenly distributed via the wedge-shaped distribution channel 3. It first enters the primary purification unit for initial interception and purification. Subsequently, the pre-purified water enters the integrated transition unit of cascade reoxygenation and particulate matter interception via the collection pipe 5, where it undergoes reoxygenation and solid matter interception. Then, the water is again distributed to each vegetable rotation pond 4 via the wedge-shaped distribution channel 3, where it comes into full contact with the vegetable roots 9 as it flows beneath the floating islands, undergoing further deep purification and nutrient absorption. Finally, the purified water is collected via the collection pipe 5 and discharged from the outlet area 7. The overflow pipe 6 provides over-limit protection throughout the entire path.

[0053] Example 2:

[0054] A method for constructing a mixed-use (edible and ornamental) lake complex with diverse wetland features includes the following steps:

[0055] S1. Constructing the primary purification unit:

[0056] A gently sloping area with suitable hydraulic gradient and good soil permeability was selected as the construction site along the shoreline of the target lake. First, a topographic survey and substrate analysis were conducted to determine the outline and dimensions of the composite wetland. Structural construction then commenced: excavation was carried out to form the foundation pit for the horizontal subsurface flow wetland unit, with a seepage-proof layer laid at the bottom and the sidewalls reinforced. The foundation pit was then filled with layers of substrate; the bottom layer consisted of gravel with a particle size of 30-50 mm as a support layer, and the upper layer consisted of a mixture of sand and expanded clay aggregate with a particle size of 5-10 mm as the main purification layer. During the substrate filling process, perforated water distribution pipes and a water collection pipe network were simultaneously pre-buried. After the horizontal subsurface flow wetland unit was completed, a soil embankment was constructed on its surface to form a surface flow wetland unit, controlling the water depth at 0.3-0.5 meters. The outlet of the water collection pipe network of the horizontal subsurface flow wetland unit was connected to the inlet of the surface flow wetland unit. During substrate filling, a diversion channel with a slope of 1%-3% is reserved or constructed inside the horizontal subsurface flow wetland unit. The channel is filled with clean pebbles or ceramic blocks with a particle size of 50-80 mm to form a diversion and silt flushing device.

[0057] S2. Construct a deep purification and resource production unit:

[0058] In the open waters of the lake, downstream of the primary purification unit, a floating island wetland for aquatic vegetables will be constructed. Specifically, this includes:

[0059] Making the floating frame: Select mature bamboo with uniform diameter, process it into poles, and use anti-corrosion iron wire or stainless steel clamps to bind them in a crisscross pattern to form a rectangular or square bamboo frame 11. Common specifications are 2 meters × 3 meters or 3 meters × 4 meters.

[0060] Forming a platform: Cover and fix high-strength polyethylene or nylon mesh 12 on the upper surface and around the bamboo frame 11, with a mesh size of 1-3 cm, to form a stable buoyancy platform and enclosure structure.

[0061] Install the planting structure: The vegetable rotation pond 4 (using a plastic planting basket with drainage holes or a custom fiberglass trough) is vertically fixed to the predetermined position above the bamboo frame 11 by several supporting bamboo poles 10, ensuring that the pond is stable and the bottom is submerged below the water surface;

[0062] Planting: Fill the vegetable rotation pond 4 with a lightweight soilless cultivation substrate, transplant the cultivated aquatic vegetable seedlings 8, and let their roots 9 naturally extend into the lake water through the holes at the bottom of the pond.

[0063] S3. Construct and integrate the hydraulic connection system:

[0064] Configure a hydraulic connection system to link the primary purification unit with the advanced purification and resource production unit, forming a complete water flow path. Specifically, this includes:

[0065] Set up inlet zone 1: Construct a sedimentation tank or buffer tank with a screen at the front end of the system;

[0066] Piping: Use PVC or PE water inlet pipe 2 to connect water inlet area 1 and wedge-shaped water distribution tank 3; use water collection pipe 5 to connect the water outlet of each purification unit and finally collect it to water outlet area 7;

[0067] Install water distribution and safety components: Install a wedge-shaped water distribution trough 3 with a uniform bottom slope, with its wide end connected to the water inlet pipe 2; install overflow pipes 6 at key locations in the system as safety leakage facilities;

[0068] System connection: The effluent from the primary purification unit is led to the inlet of the deep purification and resource production unit through a pipeline, ensuring that the water flows sequentially through the inlet area 1, inlet pipe 2, wedge-shaped water distribution trough 3, vegetable rotation pond 4, and water collection pipe 5 to the outlet area 7.

[0069] The following optional steps are also included:

[0070] In step S3, an integrated transition unit for cascading reoxygenation and particulate matter interception is installed between the water collection pipe 5 (after collecting water from the primary purification unit) and the wedge-shaped water distribution channel 3 leading to the floating island wetland. Specifically, this includes setting up a stepped cascading weir and installing a detachable interception buffer box with a filter screen below it, and connecting a bypass pipe.

[0071] In step S2, after constructing the aquatic vegetable-type floating island wetland, the floating island unit is anchored as a whole using a "master-slave flexible hinge-multi-point rigid anchoring" composite anchoring system. Specifically, this includes: connecting adjacent floating island units with flexible hinged connecting rods; selecting the master floating island unit and driving in rigid anchor piles; connecting the slave floating island unit to the master floating island or anchor piles with elastic mooring cables; and adding metal reinforcement clamps at the nodes of the bamboo frame.

[0072] Application example:

[0073] In a plateau lake basin, a diversified wetland module combining edible and ornamental features, along with its construction method, can be effectively applied to lake ecological restoration and functional enhancement projects facing eutrophication of nearshore waters caused by agricultural non-point source pollution and the influx of rural sewage. These lakes typically exhibit continuous nutrient input, decreased water transparency, and rampant algae blooms in summer. Traditional single-treatment measures struggle to simultaneously control pollution while considering ecological landscape and economic benefits, necessitating a comprehensive technical solution that synergistically achieves pollution reduction, resource recovery, and landscape beautification.

[0074] In the selected polluted lake bay area, a site survey was first conducted to determine the location and scope of the primary purification unit 1, including its catchment area, main polluted ditches, and nearshore underwater topography. This unit is located on a gentle slope near the inlet of the polluted ditch. A horizontal subsurface flow wetland unit is excavated and constructed according to the topography. The unit is layered with substrates such as gravel and expanded clay, and pre-buried with water distribution and collection pipe networks. Within the horizontal subsurface flow wetland unit, a guide channel 8 filled with large-diameter pebbles is constructed along the water flow direction as an internal diversion and siltation structure. After the horizontal subsurface flow wetland unit is completed, a surface flow wetland unit is formed by enclosing it with earthen embankments, controlling the appropriate water depth, and connecting the collection pipe network outlet to the surface flow area, thus completing the construction of a series of shoreline composite structures. Within this unit, based on local climate and water quality conditions, vegetable plants such as water spinach and water celery are combined with landscape plants such as canna lilies and water hyacinth to form a vegetation belt with interception, purification, and ornamental functions.

[0075] In an open lake area approximately ten to twenty meters from the outlet of the primary purification unit 1, an aquatic vegetable-type floating island wetland is constructed as a deep purification and resource production unit 2. First, locally sourced, mature bamboo of suitable size is used to create a rectangular frame 11, which is then bound together to form a stable floating skeleton. High-strength polyethylene mesh 12 is securely tied to the upper surface and sides of the bamboo frame 11 to form a support platform and lateral enclosure. Subsequently, several lightweight plastic planting baskets with perforated bottoms are used as vegetable rotation ponds 4, fixed to designated positions above the frame by several vertical support bamboo poles 10. An appropriate amount of lightweight cultivation substrate is filled into each vegetable rotation pond 4, and seedlings of suitable aquatic vegetables 8, such as water chestnuts and arrowhead, are transplanted, allowing their roots 9 to naturally descend through the pond bottom into the lake water. To withstand wind and waves, a composite anchoring system of master-slave flexible hinge and multi-point rigid anchoring is used to fix the floating island group. That is, the adjacent floating island units are connected by connecting rods with swivel joints, the central floating island is selected as the master unit and a rigid anchor pile is driven into the lake bottom, and the remaining slave units are connected to the master unit or anchor pile through elastic mooring cables. At the same time, metal clamps 5 are added to each binding node of the bamboo frame 11 to enhance the node strength.

[0076] To achieve systematic purification, a hydraulic connection system 3 is configured to connect the primary purification unit 1 with the deep purification and resource production unit 2. An inlet area 1 with a screen is installed at the front end of the contaminated ditch inlet for initial sedimentation and large particle interception. Lake water is transported via inlet pipe 2 to a wedge-shaped distribution channel 3 located at the inlet end of the primary purification unit 1, achieving uniform water distribution. The water purified by the primary purification unit 1 flows into the collection pipe 5 through its end collection channel. To optimize water quality, a cascading reoxygenation-particulate interception integrated transition unit 6 is installed between the collection pipe 5 and the second wedge-shaped distribution channel 3 leading to the floating island wetland. This unit consists of a stepped cascading weir and a detachable interception buffer box with a filter frame below it. The side wall of the box has an overflow port connected to the outlet area 7 via a bypass pipe. The water, after reoxygenation and filtration by the transition unit 6, is again evenly distributed to the corresponding flow channels of each vegetable rotation pond 4 through the second wedge-shaped distribution channel 3. The water is deeply purified as it comes into contact with the dense vegetable root system 9 beneath the floating islands. It then flows through collection pipes beneath each floating island unit into the main water inlet pipe 5, and is finally discharged to the outlet area 7 back to the distant shore of the lake bay. Overflow pipes 6 are installed throughout the system at key sections to ensure safe water levels.

[0077] After the system was put into operation, it entered the maintenance and monitoring phase. Plants in the primary purification unit 1 were regularly harvested in rotation, and vegetables 8 on the floating islands were harvested seasonally, with food safety testing conducted on the harvested products. Simultaneously, monitoring points were deployed along the system and inside and outside the lake bay to track water flow and key water quality indicators such as nitrogen and phosphorus, assessing the system's long-term purification efficiency and stability. This application not only effectively reduced the pollution load entering the lake but also created an aquatic vegetable cultivation area with both production and aesthetic value on the lake surface, enhancing the ecological service functions and landscape diversity of the lakeside area.

[0078] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A multi-functional lake wetland module combining edible and ornamental uses, comprising a primary purification unit located on the lake shoreline, a deep purification and resource production unit located in the open water area of ​​the lake, and a hydraulic connection system connecting the primary purification unit and the deep purification and resource production unit, characterized in that, The primary purification unit is a composite wetland consisting of a surface flow wetland unit and a horizontal subsurface flow wetland unit connected in series. The deep purification and resource production unit is an aquatic vegetable floating island wetland. The aquatic vegetable floating island wetland is located downstream of the primary purification unit. The aquatic vegetable floating island wetland includes a bamboo frame (11). A net (12) is fixed on the bamboo frame (11) to form a floating island platform. A vegetable rotation pond (4) for planting vegetables (8) is fixed on the floating island platform by supporting bamboo poles (10). The root system (9) of the vegetables (8) extends into the water. The hydraulic connection system includes an inlet area (1) and an outlet area (7). The inlet area (1) is connected to the wedge-shaped water distribution channel (3) through an inlet pipe (2). The wedge-shaped water distribution channel (3) is connected to the vegetable rotation pond (4). The vegetable rotation pond (4) is connected to the outlet area (7) through a water collection pipe (5) and is equipped with an overflow pipe (6).

2. The edible and ornamental mixed-type lake composite diversified wetland module according to claim 1, characterized in that, A cascading reoxygenation-particulate matter interception integrated transition unit is provided between the water collection pipe (5) and the wedge-shaped water distribution channel (3) of the aquatic vegetable floating island wetland; the cascading reoxygenation-particulate matter interception integrated transition unit includes a stepped cascading weir and a detachable interception buffer box located below the cascading weir, and the interception buffer box is equipped with a filter screen frame.

3. The edible and ornamental mixed-type lake composite diversified wetland module according to claim 1, characterized in that, The upper side wall of the interception buffer tank is provided with an overflow port, which is connected to the water outlet area (7) through a bypass pipe.

4. The edible and ornamental mixed-type lake composite diversified wetland module according to claim 1, characterized in that, The bamboo frame (11) of the aquatic vegetable floating island wetland is fixed to the bottom of the lake by a master-slave flexible hinge-multi-point rigid anchoring composite anchoring system; the composite anchoring system includes a flexible hinge connecting rod connecting adjacent floating island units, a rigid anchor pile fixed below the main floating island unit, and an elastic mooring cable connecting the secondary floating island unit with the main floating island or anchor pile.

5. The edible and ornamental mixed-type lake composite diversified wetland module according to claim 1, characterized in that, Metal reinforcing clamps are provided at the cross-binding nodes of the bamboo poles of the bamboo frame (11).

6. The edible and ornamental mixed-type lake composite diversified wetland module according to claim 1, characterized in that, The plants grown in the primary purification unit include vegetable plants and landscape plants; the vegetable plants include at least one of water spinach, mint, tomato and water celery; the landscape plants include at least one of reed, calamus, canna and thalia.

7. The edible and ornamental mixed-type lake composite diversified wetland module according to claim 1, characterized in that, The vegetables grown in the aquatic vegetable-type floating island wetland include at least one of water bamboo, water spinach, arrowhead, and water caltrop.

8. The edible and ornamental mixed-type lake composite diversified wetland module according to claim 1, characterized in that, The primary purification unit is equipped with a flow diversion and silt flushing device in its horizontal subsurface flow wetland unit. The flow diversion and silt flushing device is a flow diversion channel with a slope.

9. A method for constructing a mixed-type edible and ornamental lake composite diverse wetland module, applicable to the mixed-type edible and ornamental lake composite diverse wetland module as described in any one of claims 1 to 4, characterized in that, Includes the following steps: S1. Construct a composite wetland as a primary purification unit on the shoreline of the lake. This composite wetland is composed of surface flow wetland units and horizontal subsurface flow wetland units connected in series. S2. In the open waters of the lake, at the location downstream of the primary purification unit, construct an aquatic vegetable-type floating island wetland as a deep purification and resource production unit; use bamboo to make a frame (11), fix netting (12) on the frame to form a platform, fix vegetable rotation ponds (4) on the platform by supporting bamboo poles (10), and plant vegetables (8) in the ponds. S3. Configure a hydraulic connection system connecting the primary purification unit and the deep purification and resource production unit to form a water flow path that flows sequentially through the water inlet area (1), water inlet pipe (2), wedge-shaped water distribution trough (3), vegetable rotation pond (4), water collection pipe (5) to the water outlet area (7), and set an overflow pipe (6).

10. The method for constructing a mixed-type edible and ornamental lake composite diversified wetland module according to claim 9, characterized in that, In step S3, an integrated transition unit for cascading reoxygenation and particulate matter interception is installed between the water inlet pipe (5) and the wedge-shaped water distribution channel (3); in step S2, after constructing the aquatic vegetable-type floating island wetland, the floating island unit is anchored as a whole using a master-slave flexible hinge-multi-point rigid anchoring composite anchoring system.

Images