Artificial floating island device combined with PGPR culture technology

Abstract

The invention relates to the technical field of artificial floating island devices, in particular to an artificial floating island device combined with a PGPR culture technology, which comprises a plurality of groups of floating island rows arranged in rows, each floating island row is formed by splicing a plurality of groups of floating island modules, and the adjacent floating island modules are fixed through double-end connecting pieces. The floating island module comprises a floating frame assembly, a floating plate seat, a side hanging assembly and a culture tray, the floating frame assembly comprises a main frame and inserting frames, and the inserting frames are symmetrically installed at the two ends of the main frame. The height of the culture tray can be finely adjusted through the adjustable hanging assembly hung below the floating plate seat, so that the composite microbial filler in the culture tray can penetrate into a water body and keep an optimal contact state with a plant root system. When the plant root system is developed, the plant root system not only can directly contact and purify the water body around the root system, but also can penetrate into the compound microorganism filler to carry out material exchange so as to promote the growth of the plant root system.

Description

Technical Field

[0001] This invention relates to the field of artificial floating island devices, and in particular to an artificial floating island device that incorporates PGPR culture technology. Background Technology

[0002] To address water pollution, artificial floating island technology has gained widespread attention due to its numerous advantages, including low cost, high processing efficiency, no need for additional land occupation, and environmental friendliness.

[0003] However, the low purification efficiency of existing artificial floating islands is a significant problem. Traditional artificial floating islands have limited contact efficiency between the plant roots and the water and microorganisms, resulting in insufficient absorption and degradation of pollutants and difficulty in quickly and effectively purifying polluted water. Furthermore, poor plant growth is a frequent issue. Due to a lack of precise control over the cultivation environment, the plant roots cannot maintain optimal contact with the water and microorganisms, affecting plant growth and development. This not only requires more manpower for maintenance and management but may also lead to secondary pollution due to poor plant growth.

[0004] Furthermore, the assembly of some floating island devices is not convenient enough, making it difficult to flexibly combine them into floating island rows of different sizes and shapes according to actual needs, and thus unable to adapt well to various complex aquatic environments. Moreover, some floating island devices have poor stability and are prone to swaying or even damage under the impact of water flow and waves, affecting their normal use and purification effect. Summary of the Invention

[0005] This invention addresses the problems in related technologies by proposing an artificial floating island device that combines PGPR culture technology, aiming to solve the problems of low purification efficiency and difficulty in assembly of existing artificial floating islands.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: an artificial floating island device combining PGPR culture technology, comprising several rows of floating islands, each row being composed of several groups of floating island modules spliced ​​together, with adjacent floating island modules fixed together by double-headed connectors. Each floating island module includes a floating frame assembly, a floating plate seat, a side-hanging assembly, and a culture tray. The floating frame assembly includes a main frame and a plug-in frame. The plug-in frame is symmetrically installed at both ends of the main frame and is detachably fixed to the main frame. The floating plate seat is installed at the upper end of the main frame, and its four corners are fitted and fixed to the main frame. The side-hanging assembly is symmetrically arranged at both ends of the floating plate seat and is clamped and fixed to the plug-in frame. The culture tray is located directly below the floating plate seat, and the culture tray contains composite microbial packing material. An adjustable hanging assembly for suspending the culture tray is installed on the side-hanging assembly.

[0007] By adopting the above technical solutions, and through the integrated design of floating frame components, floating plate seats, side-hanging components, and cultivation trays, standardized splicing of floating island modules and precise suspension of PGPR filler are achieved. This supports plant roots to penetrate deep into the filler layer for nutrient exchange and pollutant adsorption. Double-headed connectors ensure the stable fixation of adjacent modules, reducing the risk of separation under water flow impact. The arrangement of composite microbial filler promotes the symbiotic relationship between PGPR bacteria and plant roots, enhances the microbial activity induced by root exudates, and increases the biodegradation rate of nitrogen and phosphorus compounds in the water. Adjustable hanging components allow for dynamic control of the suspension depth to adapt to water level fluctuations, ensuring continuous contact between roots and water, and improving the overall ecological restoration efficiency.

[0008] As a preferred embodiment, the main frame includes a central frame rod and side tubes for insertion and installation of the plug-in frame. The side tubes are configured in two sets, and the two sets of side tubes are fixedly installed at both ends of the central frame rod. Positioning vertical rods for installation of floating plate seats are provided on the outer side surface of the side tubes near both ends. The positioning vertical rods are integrally formed with the side tubes.

[0009] By adopting the above technical solutions, the design of the central frame rod and side tube structure of the main frame provides a stable support framework for the entire floating island module. The positioning vertical rods on the side tubes facilitate the installation of the floating plate seats, ensuring the accurate installation position and stability of the floating plate seats.

[0010] As a preferred embodiment, the plug-in frame includes a bending frame and a limiting ring seat for the limiting double-headed connector. The limiting ring seat is sleeved and installed at both ends of the bending frame, and the limiting ring seat and the bending frame are integrally formed.

[0011] By adopting the above technical solutions, the bending frame and limiting ring seat design of the plug-in frame not only facilitates the connection with the main frame, but also limits the double-headed connectors through the limiting ring seat, making the connection between adjacent floating island modules more stable.

[0012] As a preferred embodiment, the floating plate base includes an anti-wear top plate and a buoyancy box. The anti-wear top plate is evenly provided with several sets of plant placement holes. The buoyancy box is fixedly installed on the lower end face of the anti-wear top plate, and the buoyancy box is provided with matching holes that correspond one-to-one with the sets of plant placement holes.

[0013] By adopting the above technical solution, the plant placement holes on the abrasion-resistant top plate provide planting space for plants, while the buoyancy box provides buoyancy for the entire floating island module, ensuring the floating island's ability to float on the water surface. The mating holes on the buoyancy box correspond to the plant placement holes, facilitating root penetration and material exchange with the water and composite microbial filler. The abrasion-resistant top plate prevents damage to the plants when the floating island moves or is subjected to external impacts.

[0014] As a preferred embodiment, the side-hanging assembly includes a width support, a matching vertical frame, and an auxiliary cover. The matching vertical frame is installed at both ends of the width support and is fixedly connected to the width support. The auxiliary cover is fastened and fixed to the middle of the upper surface of the width support.

[0015] By adopting the above technical solution, the combined structure of the width support, the vertical bracket, and the auxiliary cover provides a support structure for suspending the culture tray. The vertical bracket is fixedly connected to the width support via connecting screws and locking nuts, facilitating installation and disassembly. The clamping tube shell design securely fixes the side-hanging assembly to the plug-in frame, ensuring the stability of the entire structure. The row of connecting holes at the lower end of the triangular frame facilitates the mutual fixing of the floating islands with bolts, allowing multiple floating islands to be connected into a larger floating island system. The bending baffle can hold the abrasion-resistant top plate, further improving the stability of the floating plate base.

[0016] As a preferred embodiment, the width support includes a housing and an outer connecting rod for fixed installation with a vertical frame, the outer connecting rod being symmetrically fixed at both ends of the housing.

[0017] By adopting the above technical solutions, the design of the housing and outer connecting rod of the width support provides a robust mounting base. The symmetrical fixing of the outer connecting rod ensures uniform load distribution and stronger suspension force. The selection of aluminum alloy castings optimizes the balance between weight and strength, and the internal cavity layout of the housing facilitates the integration of drive components and improves space utilization.

[0018] As a preferred embodiment, the vertical support includes a tripod frame and a clamping tube housing. The inner side of the tripod frame is provided with a connecting screw that connects with the outer connecting rod. A locking nut is installed on the connecting screw. The clamping tube housing is fixedly installed on the upper end face of the tripod frame and is clamped and fixed on the bending frame.

[0019] By adopting the above technical solution, in conjunction with the triangular frame of the vertical frame and the clamping tube shell structure, quick fixation is achieved by using connecting screws and locking nuts. The clamping tube shell provides high friction for the bending frame, preventing loosening. The geometric stability of the triangular frame improves the anti-overturning ability and is suitable for complex water flow environments.

[0020] As a preferred embodiment, the lower end of the tripod frame is provided with a row of connecting holes, and a bending baffle for pressing and anti-wear top plate is installed on the outer side of the clamping tube shell. The bending baffle is integrally formed with the clamping tube shell.

[0021] By adopting the above technical solution, the row of connecting holes and the bent baffle design of the tripod frame facilitate the bolting of adjacent floating island rows, enabling large-area array deployment; the pressing effect of the bent baffle strengthens the fixation of the wear-resistant top plate and reduces edge wear; this configuration enhances the synergy between modules and improves the water purification coverage.

[0022] As a preferred embodiment, the culture tray includes a tray box and a positioning frame. The positioning frame is fitted and fixed on the outer side of the tray box, and hook ears are fixedly installed on the four corners of the positioning frame. Several sets of water exchange holes are opened on the lower end face of the tray box. The adjustable hanging assembly includes a synchronous long shaft, a rope winding wheel, and a drive motor. The two ends of the synchronous long shaft are rotatably mounted on a tripod frame, and a large gear is fitted and fixed in the middle of the synchronous long shaft. The rope winding wheel is fitted and fixed on both ends of the synchronous long shaft, and a hanging rope that cooperates with the hook ears is wound on the rope winding wheel. The drive motor is fixedly installed in the housing, and a small gear that meshes with the large gear is fixedly installed on the output shaft of the drive motor.

[0023] By adopting the above technical solution, the composite microbial packing material arranged inside the tray (including silt suitable for plant root growth and bio-rope-like carbon fiber aquatic plants after microbial biofilm formation, with PGPR microorganisms selected) provides a good growth environment and nutrients for the plants. The water exchange holes on the lower end of the tray allow for water exchange between the tray and the external water, ensuring that the plant roots can access sufficient oxygen and nutrients. The design of the positioning frame and hook lugs facilitates connection between the cultivation tray and the adjustable hanging assembly, making it easy to adjust the height of the cultivation tray. The drive motor, through the transmission of small and large gears, drives the synchronous long shaft to rotate, thereby causing the rope reel to wind up or release the hanging rope, achieving flexible adjustment of the cultivation tray height. This adjustable design can adjust the height of the cultivation tray according to different stages of plant growth and changes in the aquatic environment, allowing plant roots to better contact the water and composite microbial packing material, promoting plant growth and water purification.

[0024] As a preferred embodiment, the double-headed connector includes a double-arc base plate, a pre-clamping elastic seat, and a mating clamping plate. The pre-clamping elastic seat is configured in two sets, and the two sets of pre-clamping elastic seats are symmetrically fixed in the middle of the upper surface of the double-arc base plate. The mating clamping plate is installed at both ends of the upper surface of the double-arc base plate. One end of the mating clamping plate is rotatably connected to the double-arc base plate, and the other end of the mating clamping plate is fixedly connected to the double-arc base plate by bolts.

[0025] By adopting the above technical solution, the structural design of the double-arc base plate, pre-clamped elastic seat, and mating clamp plate can firmly connect adjacent floating island modules. The pre-clamped elastic seat can provide a certain elastic preload during installation, making the connection tighter and facilitating quick assembly. The mating clamp plate is fixedly connected to the double-arc base plate with bolts, further enhancing the stability of the connection.

[0026] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention, through an adjustable suspension assembly suspended below the float base, can precisely adjust the height of the culture tray, allowing the composite microbial filler within the tray to penetrate deep into the water and maintain optimal contact with the plant roots. As the plant roots develop, they can not only directly contact and purify the water surrounding them, but also penetrate the composite microbial filler for nutrient exchange, promoting their own growth and significantly improving the contact efficiency between the roots, water, and filler.

[0027] By using composite microbial packing material arranged in the culture tray and introducing PGPR bacteria, a favorable growth environment can be provided for PGPR bacteria. PGPR bacteria can form a symbiotic relationship with plant roots, promoting plant growth and enhancing the plant's ability to absorb pollutants. Simultaneously, the introduction of PGPR interacts with plants, epiphytes, and resident microbial communities, achieving a new ecological balance and more effectively utilizing microbial diversity to degrade and transform pollutants, significantly improving the self-purification capacity of the water body.

[0028] The main frame of the floating structure and the detachable, fixed plug-in frame design, along with the double-headed connectors between the floating island modules, allow for easy assembly and splicing of the floating island devices to form large floating island arrays. The side-mounted components clamping and fixing to the plug-in frames, and the cooperation between the plug-in frames and the limiting ring seats, provide a robust connection, improving the overall stability of the device and effectively resisting the impact of water currents and waves. The modular design of the floating islands allows for flexible combination according to actual needs, adapting to water bodies of different sizes and shapes. Simultaneously, planting vegetation effectively beautifies the aquatic landscape and improves the aquatic ecological environment.

[0029] The adjustable hanging assembly allows for precise adjustment of the culture tray height according to the actual water depth and plant growth needs, ensuring the tray is always in the optimal growth and purification zone, thereby maximizing its functionality. The water exchange holes on the lower surface of the culture tray promote water flow inside and outside the tray, ensuring sufficient oxygen for microorganisms and removing metabolic waste, further enhancing microbial activity and water purification efficiency. Attached Figure Description

[0030] Figure 1 This is a perspective view of the floating island modules being spliced ​​together in an embodiment of the present invention; Figure 2 yes Figure 1 A partial enlarged view of part A of the device shown; Figure 3 This is a perspective view of the overall structure of the floating island module in an embodiment of the present invention; Figure 4 yes Figure 3 A front view of the device shown; Figure 5 yes Figure 3 Top view of the device shown; Figure 6 This is a perspective view of the floating frame assembly in an embodiment of the present invention; Figure 7 yes Figure 6 Top view of the device shown; Figure 8 This is a perspective view of the float seat in an embodiment of the present invention; Figure 9 yes Figure 8 A front view of the device shown; Figure 10 This is a perspective view of the side-hanging assembly and the adjustable vertical hanging assembly in an embodiment of the present invention. Figure 11 yes Figure 10 Side view of the device shown; Figure 12 yes Figure 10 A front view of the device shown; Figure 13 yes Figure 12 A partial enlarged view of part B of the device shown; Figure 14 This is a three-dimensional view of the culture tray in an embodiment of the present invention; Figure 15 yes Figure 14 A magnified view of part C of the device shown.

[0031] In the diagram: 1. Floating frame assembly; 10. Double-headed connector; 101. Double-arc base plate; 102. Pre-clamped elastic seat; 103. Matching clamp plate; 11. Main frame; 111. Central frame rod; 112. Side tube; 113. Positioning vertical rod; 12. Insertion frame; 121. Bending frame; 122. Limiting ring seat; 2. Floating plate seat; 21. Abrasion-resistant top plate; 211. Plant placement hole; 22. Buoyancy box; 3. Side suspension assembly; 31. Width support; 311. Seat shell; 312. 32. External connecting rod; 321. Vertical support frame; 322. Triangular frame; 323. Clamping tube shell; 324. Connecting screw; 325. Row of connecting holes; 326. Bending baffle; 33. Auxiliary cover; 4. Culture tray; 41. Tray box; 411. Water exchange hole; 42. Positioning outer frame; 421. Hook ear; 5. Adjustable hanging assembly; 51. Synchronous long shaft; 511. Large gear; 52. Rope reel; 521. Hanging rope; 53. Drive motor; 531. Small gear. Detailed Implementation

[0032] 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. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. 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.

[0033] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0034] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0035] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0036] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0037] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0038] Example 1 Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5An artificial floating island device combining PGPR culture technology includes several rows of floating islands, each row consisting of several sets of floating island modules. Adjacent floating island modules are fixed together by double-headed connectors 10. Each floating island module includes a floating frame assembly 1, a floating plate seat 2, a side-hanging assembly 3, and a culture tray 4. The floating frame assembly 1 includes a main frame 11 and a plug-in frame 12. The plug-in frame 12 is symmetrically installed at both ends of the main frame 11 and is detachably fixed to the main frame 11. The floating plate seat 2 is installed on the upper end of the main frame 11, and its four corners are fitted and fixed to the main frame 11. The side-hanging assembly 3 is symmetrically arranged at both ends of the floating plate seat 2 and is clamped and fixed to the plug-in frame 12. The culture tray 4 is located directly below the floating plate seat 2 and contains composite microbial packing material. An adjustable hanging assembly 5 for suspending the culture tray 4 is installed on the side-hanging assembly 3. Through the integrated design of the floating frame assembly 1, floating plate seat 2, side suspension assembly 3, and cultivation tray 4, the standardized splicing of the floating island module and the precise suspension of the PGPR filler are achieved, supporting plant roots to penetrate deep into the filler layer for nutrient exchange and pollutant adsorption. The double-headed connector 10 ensures the stable fixation of adjacent modules and reduces the risk of separation under water flow impact. The arrangement of the composite microbial filler promotes the symbiotic relationship between PGPR bacteria and plant roots, enhances the microbial activity induced by root exudates, and increases the biodegradation rate of nitrogen and phosphorus compounds in the water. The adjustable suspension assembly 5 allows for dynamic adjustment of the suspension depth to adapt to water level fluctuations, ensuring continuous contact between the roots and the water, and improving the overall ecological restoration efficiency.

[0039] Reference Figure 5 , Figure 6 and Figure 7The main frame 11 includes a central frame rod 111 and side tubes 112 for insertion and installation of the plug-in frame 12. Two sets of side tubes 112 are fixedly installed at both ends of the central frame rod 111. Positioning vertical rods 113 for installing the float seat 2 are provided on the outer surface of the side tubes 112 near both ends. The positioning vertical rods 113 are integrally formed with the side tubes 112. The structural design of the central frame rod 111 and side tubes 112 of the main frame 11 provides a stable support frame for the entire floating island module. The positioning vertical rods 113 on the side tubes 112 facilitate the installation of the float seat 2, ensuring the accurate installation position and stability of the float seat 2. The plug-in frame 12 includes a bending frame 121 and a limiting ring seat 122 of the limiting double-headed connector 10. The limiting ring seat 122 is sleeved and installed at both ends of the bending frame 121, and is integrally formed with the bending frame 121. The design of the bending frame 121 and the limiting ring seat 122 of the plug-in frame 12 not only facilitates the connection with the main frame 11, but also limits the double-headed connector 10 through the limiting ring seat 122, making the connection between adjacent floating island modules more stable. Adjacent floating island modules are fixedly connected by the double-headed connector 10 to form a stable large-area floating island array. This device is suitable for still water or low-velocity water bodies, such as lakes or artificial wetlands. The total length of the floating island array can be extended to 10-50 meters and the width to 2-5 meters depending on the size of the water area, ensuring a coverage rate of 20%-30% of the water area. The floating frame assembly 1 serves as the basic support structure, including the main frame 11 and the plug-in frame 12. The main frame 11 is made of high-strength aluminum alloy material such as 6061-T6 alloy, which has excellent corrosion resistance and a density of 2.7g / cm³. Centered on the central frame rod 111, the central frame rod 111 is a 1.5-meter-long circular aluminum tube with a diameter of 50mm and a wall thickness of 3mm, providing lateral rigidity. The side tubes 112 are configured in two sets, each consisting of an aluminum tube with a diameter of 40mm and a wall thickness of 2.5mm. These are fixedly welded to both ends of the central frame rod 111 for inserting and installing the frame 12, ensuring a connection depth of 200mm to prevent loosening. Positioning vertical rods 113, with a diameter of 20mm and a height of 150mm, are integrally formed on the outer surface of the side tubes 112 near both ends. These are used for securing the floating plate seats 2. The entire surface of the main frame 11 is coated with an epoxy resin anti-corrosion layer, 50μm thick, providing over 1000 hours of salt spray corrosion resistance. The 0-bending frame 121 is made of 304 stainless steel tubing, 30mm in diameter and 2mm thick, bent into a U-shape, 1 meter long, with both ends inserted parallel to the side tubes 112. Limiting ring seats 122 are integrally formed at both ends of the bending frame 121. These are annular stainless steel parts with an inner diameter of 35mm and an outer diameter of 45mm, used to limit the engagement of the double-ended connectors 10 and prevent misalignment of adjacent modules.

[0040] Reference Figure 8 and Figure 9The floating platform base 2 includes an anti-wear top plate 21 and a buoyancy box 22. The anti-wear top plate 21 has several sets of plant placement holes 211 evenly spaced. The buoyancy box 22 is fixedly installed on the lower end face of the anti-wear top plate 21, and has matching holes corresponding to the plant placement holes 211. The plant placement holes 211 on the anti-wear top plate 21 provide planting space for the plants, while the buoyancy box 22 provides buoyancy for the entire floating island module, ensuring the floating island's ability to float on the water surface. The matching holes on the buoyancy box 22 correspond to the plant placement holes 211, facilitating the passage of plant roots and material exchange with the water and composite microbial filler. The anti-wear top plate 21 prevents damage to the plants when the floating island moves or is subjected to external impact. The floating platform base 2 is installed on the upper end of the main frame 11, and its four corners are fixed to the positioning vertical rod 113 by bolts. The floating platform 2 includes an abrasion-resistant top plate 21 and a buoyancy box 22. The abrasion-resistant top plate 21 is made of high-density polyethylene (HDPE) sheet, 10mm thick, and 1m×1m in size. Several sets of plant placement holes 211 are evenly distributed on the upper surface, each hole being 50mm in diameter and 80mm deep, for a total of 36 holes spaced 150mm apart, facilitating the planting of aquatic plants such as reeds or water onions. The surface of the top plate is covered with a wear-resistant polyurethane coating with a Shore A hardness of 90 and a coefficient of friction of 0.2, preventing root friction damage. The buoyancy box 22 is fixedly welded to the lower end face of the abrasion-resistant top plate 21. It is a PVC box filled with closed-cell polyurethane foam, with a volume of 0.5m³, providing buoyancy up to 500kg / m². The upper end has matching holes with a diameter of 45mm corresponding to the plant placement holes 211, allowing roots to extend downwards.

[0041] Reference Figure 10 , Figure 11 and Figure 12The side-hanging assembly 3 includes a width support 31, a matching vertical frame 32, and an auxiliary cover 33. The matching vertical frame 32 is installed at both ends of the width support 31 and is fixedly connected to the width support 31. The auxiliary cover 33 is fastened and fixed to the middle of the upper surface of the width support 31. The combined structure of the width support 31, the matching vertical frame 32, and the auxiliary cover 33 provides a support structure for the suspension of the culture tray 4. The matching vertical frame 32 is fixedly connected to the width support 31 by connecting screws 323 and locking nuts, facilitating installation and disassembly. The design of the clamping tube shell 322 can firmly fix the side-hanging assembly 3 to the plug frame 12, ensuring the stability of the entire structure. The row of connecting holes 324 at the lower end of the triangular frame 321 facilitates the mutual fixing of the floating islands with bolts, allowing multiple floating islands to be connected into a larger floating island system. The bending baffle 325 can press down on the anti-wear top plate 21, further improving the stability of the floating plate seat 2 and improving the overall linkage of the system. The width support 31 includes a housing 311 and an outer connecting rod 312 for fixed installation on the mating vertical frame 32. The outer connecting rod 312 is symmetrically fixed at both ends of the housing 311. The design of the housing 311 and the outer connecting rod 312 of the width support 31 provides a robust mounting base. The symmetrical fixing of the outer connecting rod 312 ensures uniform load distribution and can withstand a suspension force of up to 200 kg. The selection of aluminum alloy castings optimizes the balance between weight and strength. The internal cavity layout of the housing 311 facilitates the integration of drive components and improves space utilization. The mating vertical frame 32 includes a tripod frame 321 and a clamping tube housing 322. A connecting screw 323 that mates with the outer connecting rod 312 is provided on the inner side of the tripod frame 321. A matching locking nut is installed on the connecting screw 323. The clamping tube housing 322 is fixedly installed on the upper end face of the tripod frame 321 and clamped and fixed on the bending frame 121. The triangular frame 321 and clamping shell 322, which work in conjunction with the vertical frame 32, are quickly fixed using connecting screws 323 and locking nuts. The clamping shell 322 provides high friction for clamping the bending frame 121, preventing loosening. The geometric stability of the triangular frame is improved by 30% in terms of anti-overturning ability, making it suitable for complex water flow environments. The lower end of the triangular frame 321 has a row of connecting holes 324. A bending baffle 325 that presses against the anti-wear top plate 21 is installed on the outer surface of the clamping shell 322. The bending baffle 325 is integrally formed with the clamping shell 322. This allows the floating islands to be fixed to each other by bolts passing through the row of connecting holes 324. The design of the row of connecting holes 324 and the bent baffle 325 of the tripod frame 321 facilitates the bolt fixing of adjacent floating islands, enabling large-area array deployment; the pressing effect of the bent baffle 325 strengthens the fixation of the anti-wear top plate 21 and reduces edge wear; this configuration enhances the synergy between modules, supports the expansion of the floating island length to 50 meters, and improves the water purification coverage.The width support 31 provides lateral support and includes a housing 311 and an outer connecting rod 312. The housing 311 is an aluminum alloy casting with dimensions of 300mm × 200mm × 150mm and a wall thickness of 5mm, with an inner cavity accommodating the drive motor 53. The outer connecting rod 312 is symmetrically fixed at both ends of the housing 311, is a threaded rod with a diameter of 25mm and a length of 200mm, and is used to connect with the mating vertical frame 32. The mating vertical frame 32 is installed at both ends of the width support 31 and includes a tripod frame 321 and a clamping tube housing 322. The tripod frame 321 is welded from Q235 steel, with a base length of 400mm and a height of 300mm. The inner side is provided with a connecting screw 323M10 thread, equipped with a nylon-embedded locking nut, and a torque of 20Nm to fix the outer connecting rod 312. The clamping tube housing 322 is fixed to the upper end of the tripod frame 321 and is a semi-circular stainless steel clamp with an inner diameter of 32mm, which clamps the bending frame 121 by bolts. The lower end of the tripod frame 321 has a row of 6 connecting holes 324, each 12mm in diameter and spaced 50mm apart, for easy bolt fixing of adjacent floating islands. The outer side of the clamping shell 322 has an integrally formed bent baffle 325, 100mm in length and bent at a 45° angle, which presses against the edge of the anti-wear top plate 21 to enhance stability. The auxiliary cover 33 is an ABS plastic cover plate, fastened to the upper center of the base shell 311, with an IP65 sealing rating to prevent moisture intrusion.

[0042] Reference Figure 3 , Figure 14 and Figure 15 The culture tray 4 includes a tray box 41 and a positioning frame 42. The positioning frame 42 is fitted and fixed to the outer surface of the tray box 41, and hook ears 421 are fixedly installed on the four corners of the positioning frame 42. Several sets of water exchange holes 411 are opened on the lower end face of the tray box 41. The culture tray 4 is located directly below the float seat 2 and is used for PGPR culture. The tray box 41 is injection molded from food-grade PP plastic, with dimensions of 900mm×900mm×200mm. Several sets of water exchange holes 411 with a diameter of 10mm are opened at the bottom, with a total of 100 holes. The hole diameter is adjustable to control the water flow rate of 0.5-2L / min. The tray is filled with composite microbial packing material, specifically including silt particles with a diameter <2mm, a moisture content of 40%-60%, and a pH of 6.5-7.5 suitable for plant root growth, and bio-rope-like carbon fiber aquatic plant rope with a diameter of 5mm, a length of 500mm, and a density of 1.2g / cm³ after microbial biofilm formation. The microorganisms selected are PGPR strains, such as Bacillus subtilis and Rhizobium spp., with an inoculum of 10^8 CFU / g. After 7-10 days of biofilm formation via the bio-rope, a stable biofilm is formed, promoting nitrogen and phosphorus cycling. The positioning frame 42 is an aluminum alloy frame with a cross-section of 20mm×20mm, fitted and fixed to the outside of the tray box 41, with stainless steel hooks 421 at the four corners, and a load capacity of 50kg.

[0043] Reference Figure 10 , Figure 12 and Figure 13 The adjustable hanging assembly 5 includes a synchronous long shaft 51, a rope reel 52, and a drive motor 53. The two ends of the synchronous long shaft 51 are rotatably mounted on a tripod frame 321, and a large gear 511 is fixedly fitted onto the middle of the synchronous long shaft 51. The rope reel 52 is fitted and fixed onto both ends of the synchronous long shaft 51, and a hanging rope 521 that engages with the hook lug 421 is wound onto the rope reel 52. The drive motor 53 is fixedly mounted in the housing 311, and a small gear 531 that meshes with the large gear 511 is fixedly mounted on the output shaft of the drive motor 53. The composite microbial packing material arranged inside the tray 41 includes silt suitable for plant root growth and bio-rope-like carbon fiber aquatic plants after microbial biofilm formation. The microorganisms selected are PGPR strains, providing a good growth environment and nutrients for the plants. The water exchange hole 411 on the lower end face of the tray 41 allows the water inside the tray 41 to exchange with the external water, ensuring that the plant roots can access sufficient oxygen and nutrients. The design of the positioning frame 42 and hook lugs 421 facilitates the connection between the cultivation tray 4 and the adjustable hanging assembly 5, making it easy to adjust the height of the cultivation tray 4. The drive motor 53, through the transmission of the small gear 531 and the large gear 511, drives the synchronous long shaft 51 to rotate, thereby causing the rope winding wheel 52 to wind up or release the hanging rope 521, achieving flexible adjustment of the height of the cultivation tray 4. This adjustable design can adjust the height of the cultivation tray 4 according to different stages of plant growth and changes in the aquatic environment, allowing plant roots to better contact the water and composite microbial filler, promoting plant growth and water purification. The synchronous long shaft 51 is a stainless steel shaft with a diameter of 20mm and a length of 800mm. Both ends are rotatably mounted on the tripod frame 321 through SKF 6204 bearings with a load capacity of 500N. The large gear 511 with a module of 2 and 40 teeth is fitted in the middle. The rope reel 52, with a diameter of 100mm and a width of 50mm, is made of nylon and fixed to both ends of the long shaft. It winds up the PE fiber rope 521, with a diameter of 5mm and a strength of 200kg, which mates with the hook lug 421. The drive motor 53 is a NEMA 23 stepper motor with a torque of 1.8Nm, a speed of 300r / min, and a voltage of 24VDC. It is driven by a PLC controller such as a Siemens S7-1200, with a control accuracy of ±0.1°. It is fixedly installed in the housing 311, and the output end has a fixed pinion 531 with a module of 2 and 20 teeth, which meshes with the large gear 511. The motor uses an Omron E2E-X5ME1 limit sensor to monitor the rope length at a distance of 5mm. Combined with an RS485 ultrasonic water level sensor, it achieves automatic adjustment with an accuracy of ±3mm. The suspension depth is 0-500mm, and the response time is <5s. The control system integrates a PID algorithm with a proportional gain of Kp=0.5, an integral of Ki=0.1, and a derivative of Kd=0.01, ensuring that the synchronous lifting error is <2mm.

[0044] Example 2 Reference Figure 1 and Figure 3 An artificial floating island device combining PGPR culture technology is disclosed, comprising several rows of floating islands, each row consisting of several sets of floating island modules assembled together, with adjacent floating island modules fixed together by double-headed connectors 10. The double-headed connector 10 includes a double-arc base plate 101, pre-clamping elastic seats 102, and mating clamping plates 103. Two sets of pre-clamping elastic seats 102 are symmetrically fixed to the middle of the upper surface of the double-arc base plate 101. The mating clamping plates 103 are installed at both ends of the upper surface of the double-arc base plate 101, with one end of the mating clamping plate 103 rotatably connected to the double-arc base plate 101 and the other end of the mating clamping plate 103 fixedly connected to the double-arc base plate 101 by bolts. The structural design of the double-arc base plate 101, pre-clamping elastic seats 102, and mating clamping plates 103 enables a secure connection between adjacent floating island modules. The pre-clamped elastic seat 102 provides a certain elastic pre-tightening force during installation, making the connection tighter and facilitating quick assembly. The mating clamp 103 is fixedly connected to the double-arc base plate 101 by bolts, further enhancing the stability of the connection. The double-headed connector 10 is used for fixing between modules and includes the double-arc base plate 101, the pre-clamped elastic seat 102, and the mating clamp 103. The double-arc base plate 101 is a 10mm thick, arc-shaped rubber pad with an arc radius R=500mm and a Shore A hardness of 70, providing cushioning. Two sets of pre-clamped elastic seats 102, made of silicone rubber and with a compression deformation rate of 30%, are symmetrically fixed in the middle for initial engagement with the limiting ring seat 122. The mating clamp 103 is a 5mm thick steel plate, hinged to the base plate at both ends, and fixed at one end with an M12 bolt with a torque of 30Nm to ensure a connection strength >1000N.

[0045] During actual installation, the floating frame assembly 1 is installed first. The central frame rod 111 is placed horizontally, and the two sets of side tubes 112 are fixedly installed at both ends of the central frame rod 111, ensuring that the side tubes 112 are perpendicular to the central frame rod 111 and firmly connected. The side tubes 112 can be fixed to the central frame rod 111 by welding or bolting. The bending frame 121 is inserted into the side tubes 112 respectively, so that the limiting ring seat 122 is in the appropriate position. Positioning holes can be set on the side tubes 112 and the bending frame 121, and fixed by pins or bolts to ensure that the plug-in frame 12 is detachably and fixedly connected to the main frame 11. Then, the floating plate seat 2 is installed. The buoyancy box 22 is fixedly installed on the lower end face of the anti-wear top plate 21, which can be done by glue or bolting. The four corners of the floating plate seat 2 are fitted onto the positioning vertical rods 113 of the main frame 11 to ensure that the floating plate seat 2 is installed stably.

[0046] Next, install the side-hanging assembly 3. Symmetrically fix the outer connecting rods 312 to both ends of the housing 311 using welding or bolts. Connect the tripod frame 321 to the outer connecting rods 312 using connecting screws 323, and install lock nuts to ensure a secure connection between the vertical frame 32 and the width support 31. Fix the clamping tube housing 322 to the upper surface of the tripod frame 321, and then clamp and fix the clamping tube housing 322 to the bending frame 121 using bolts or clips. Fasten and fix the auxiliary cover 33 to the middle of the upper surface of the width support 31.

[0047] Finally, the cultivation tray 4 is installed. The positioning frame 42 is fitted and fixed to the outer surface of the tray box 41, which can be done by glue or bolts. A composite microbial packing material is arranged inside the tray box 41, including silt suitable for plant root growth and bio-rope-like carbon fiber aquatic plants after microbial biofilm formation. The microorganisms selected are PGPR strains. One end of the suspension rope 521 is fixed to the rope reel 52, and the other end is engaged with the hook lug 421, completing the connection between the cultivation tray 4 and the adjustable hanging assembly 5. Thus, the floating island module assembly is complete.

[0048] When it is necessary to assemble floating island modules, adjacent floating island modules are fixed together using double-headed connectors 10. The double-arc base plate 101 is placed at the connection point of adjacent floating island modules, and the pre-clamping elastic seat 102 provides a certain pre-tightening effect. Then, one end of the mating clamping plate 103 is rotatably connected to the double-arc base plate 101, and the other end is fixedly connected to the double-arc base plate 101 with bolts, ensuring a tight connection between adjacent floating island modules, thus forming a floating island row. When floating island rows need to be connected to each other, multiple floating island modules are assembled into a floating island row by passing bolts through the row of connecting holes 324 at the lower end of the tripod frame 321. Multiple floating island rows are then connected to form a larger floating island system.

[0049] When the height of the culture tray 4 needs to be adjusted, the controller sends a command to the drive motor 53. The drive motor 53 drives the pinion 531 to rotate. The pinion 531 meshes with the large gear 511, thereby driving the synchronous long shaft 51 to rotate. The rope reel 52 winds up or releases the hanging rope 521, thereby realizing the adjustment of the height of the culture tray 4.

[0050] Working Principle: In practical applications, several floating island modules 100 are spliced ​​together using double-headed connectors 10 to form the desired island array. Plant seedlings or seeds are implanted above the wear-resistant top plate 210 through plant placement holes 211. The cultivation tray 4 is filled with composite microbial filler and inoculated with PGPR bacteria. Then, the synchronous long shaft 510 is rotated by the drive motor 530, and the cultivation tray 4 is raised and lowered by the rope wheel 520 and the suspension rope 521. In the initial stage, the cultivation tray 4 is lowered into the water to ensure full contact between the composite microbial filler and the water, promoting the activity of microorganisms. After the plant roots grow out of the plant placement holes 211, the height of the cultivation tray 4 can be adjusted by adjusting the rotation of the synchronous long shaft 510 according to the growth of the plant roots, so that it is always kept in the optimal area for plant root growth and water purification.

[0051] During their growth, plant roots directly absorb pollutants from the water. Furthermore, their extensive root system penetrates deep into the composite microbial packing material in culture tray 4, exchanging substances with the PGPR bacteria and other beneficial microorganisms attached to the packing material. The PGPR bacteria secrete growth hormones, promoting plant growth and enhancing nutrient absorption. Simultaneously, the PGPR bacteria also produce antibiotics, inhibiting the growth of pathogens.

[0052] Water exchanges with the composite microbial packing material inside the culture tray 4 through the water exchange holes 411 on the culture tray 4, providing oxygen to the microorganisms and removing metabolic products to maintain their activity. Adjacent floating island modules are connected to each other by double-headed connectors 10. The arc-shaped groove of the double-arc base plate 101 is fastened to the bending frame 121 of the adjacent floating island module, and the pre-clamped elastic seat 102 provides cushioning and elasticity. It is fixed with bolts in conjunction with the clamping plate 103 to ensure the firmness and integrity of the connection.

[0053] During implementation, the floating island module is first assembled: the plug-in frame 12 is inserted into the side tube 112 of the main frame 11 and fixed with bolts; the float seat 2 is fitted onto the positioning vertical rod 113, and aquatic plants are planted in the placement hole 211; the side-hanging assembly 3 is clamped onto the plug-in frame 12, the drive motor 53 is installed and connected to the control system; the culture tray 4 is suspended at an initial depth of 200mm, and composite microbial filler is injected. Multiple modules are spliced ​​into a row through double-headed connectors 10 and deployed on the water surface, using the buoyancy box 22 for buoyancy. During operation, the drive motor 53 adjusts the depth of the culture tray according to the data from the water level sensor (not shown in the figure) to ensure that the plant roots are immersed in the filler 20-30cm, promoting the exchange between PGPR and the roots. The pH of the filler and the number of colonies are monitored weekly, and the PGPR inoculant concentration is replenished at 10^7 CFU / mL.

[0054] In practical applications, the device achieves a purification efficiency of 70% COD removal rate, 60% TN removal rate, and 50% TP removal rate, which is far higher than the 30%-40% of traditional floating islands.

[0055] The above are preferred embodiments of the present invention. Those skilled in the art can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments described above. Any obvious improvements, substitutions or modifications made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims

1. An artificial floating island device combining PGPR culture technology, comprising several rows of floating islands, wherein each row of floating islands is assembled from several groups of floating island modules, and adjacent floating island modules are fixed together by double-headed connectors (10), characterized in that: The floating island module includes a floating frame assembly (1), a floating plate seat (2), a side-hanging assembly (3), and a culture tray (4). The floating frame assembly (1) includes a main frame (11) and a plug-in frame (12). The plug-in frame (12) is symmetrically installed at both ends of the main frame (11) and is detachably and fixedly connected to the main frame (11). The floating plate seat (2) is installed at the upper end of the main frame (11) and the four corners of the floating plate seat (2) are fitted and fixed on the main frame (11). The side-hanging assembly (3) is symmetrically arranged at both ends of the floating plate seat (2) and is clamped and fixed on the plug-in frame (12). The culture tray (4) is located directly below the floating plate seat (2) and is filled with composite microbial packing material. An adjustable hanging assembly (5) for suspending the culture tray (4) is installed on the side-hanging assembly (3).

2. The artificial floating island device combining PGPR culture technology according to claim 1, characterized in that: The main frame (11) includes a central frame rod (111) and side tubes (112) for the insertion and installation of the plug-in frame (12). The side tubes (112) are configured in two sets, and the two sets of side tubes (112) are fixedly installed at both ends of the central frame rod (111). Positioning vertical rods (113) for the installation of the float seat (2) are provided on the outer side surface of the side tubes (112) near both ends. The positioning vertical rods (113) are integrally formed with the side tubes (112).

3. The artificial floating island device combining PGPR culture technology according to claim 2, characterized in that: The plug frame (12) includes a bending frame (121) and a limiting ring seat (122) of the limiting double-headed connector (10). The limiting ring seat (122) is sleeved and installed at both ends of the bending frame (121), and the limiting ring seat (122) and the bending frame (121) are integrally formed.

4. The artificial floating island device combining PGPR culture technology according to claim 3, characterized in that: The floating plate seat (2) includes a wear-resistant top plate (21) and a buoyancy box (22). The wear-resistant top plate (21) is evenly provided with a number of plant placement holes (211). The buoyancy box (22) is fixedly installed on the lower end face of the wear-resistant top plate (21), and the buoyancy box (22) is provided with matching holes that correspond one-to-one with the plant placement holes (211).

5. The artificial floating island device combining PGPR culture technology according to claim 4, characterized in that: The side-mounted assembly (3) includes a width support (31), a matching vertical frame (32), and an auxiliary cover (33). The matching vertical frame (32) is installed at both ends of the width support (31) and is fixedly connected to the width support (31). The auxiliary cover (33) is fastened and fixed to the middle of the upper surface of the width support (31).

6. The artificial floating island device combining PGPR culture technology according to claim 5, characterized in that: The width support (31) includes a housing (311) and an outer connecting rod (312) for fixed installation with the vertical frame (32). The outer connecting rod (312) is symmetrically fixed at both ends of the housing (311).

7. The artificial floating island device combining PGPR culture technology according to claim 6, characterized in that: The vertical support (32) includes a tripod frame (321) and a clamping tube shell (322). The inner side of the tripod frame (321) is provided with a connecting screw (323) that is connected to the outer connecting rod (312). A locking nut is installed on the connecting screw (323). The clamping tube shell (322) is fixedly installed on the upper end face of the tripod frame (321) and clamped and fixed on the bending frame (121).

8. The artificial floating island device combining PGPR culture technology according to claim 7, characterized in that: The lower end of the tripod frame (321) is provided with a row of connecting holes (324), and a bending baffle (325) for pressing and anti-wear top plate (21) is installed on the outer side of the clamping tube shell (322). The bending baffle (325) is integrally formed with the clamping tube shell (322).

9. The artificial floating island device combining PGPR culture technology according to claim 8, characterized in that: The culture tray (4) includes a tray box (41) and a positioning frame (42). The positioning frame (42) is fitted and fixed on the outer side of the tray box (41), and hook ears (421) are fixedly installed on the four corners of the positioning frame (42). The lower end face of the tray box (41) is provided with several sets of water exchange holes (411). The adjustable hanging assembly (5) includes a synchronous long shaft (51), a rope winding wheel (52), and a drive motor (53). The two ends of the synchronous long shaft (51) rotate. The system is mounted on a tripod frame (321), and a large gear (511) is fixedly fitted in the middle of the synchronous long shaft (51). The rope reel (52) is fitted and fixed at both ends of the synchronous long shaft (51), and a lifting rope (521) that cooperates with the hook ear (421) is wound on the rope reel (52). The drive motor (53) is fixedly installed in the housing (311), and a small gear (531) that meshes with the large gear (511) is fixedly installed on the output shaft of the drive motor (53).

10. The artificial floating island device combining PGPR culture technology according to claim 9, characterized in that: The double-headed connector (10) includes a double-arc base plate (101), a pre-clamping elastic seat (102), and a mating clamping plate (103). The pre-clamping elastic seat (102) is configured in two sets, and the two sets of pre-clamping elastic seats (102) are symmetrically fixed in the middle of the upper end face of the double-arc base plate (101). The mating clamping plate (103) is installed at both ends of the upper end face of the double-arc base plate (101). One end of the mating clamping plate (103) is rotatably connected to the double-arc base plate (101), and the other end of the mating clamping plate (103) is fixedly connected to the double-arc base plate (101) by bolts.

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