Integrated device for fishing and dewatering enteromorpha and closed-loop recycling of squeezed liquid

Abstract

The invention discloses an integrated device for enteromorpha salvage dehydration and pressed liquid closed-loop recovery. The integrated device comprises a double-roller traction mechanism, a conveying mechanism, a dehydration decrement mechanism and a liquid treatment and recovery mechanism, the double-roller traction mechanism efficiently fires enteromorpha through wide-mouth suction and double-roller traction, the conveying mechanism avoids winding through shaftless spiral conveying and conducts preliminary dehydration, and the dehydration reduction mechanism achieves preliminary solid-liquid separation through spiral extrusion dehydration and optimization of a screen to produce formed algae cakes and squeezed liquid. The liquid treatment and recovery mechanism uses a drum screen to remove residues from squeezed liquid, clear liquid is separated into fresh water and a concentrated nutrient solution through a reverse osmosis membrane group after being subjected to buffering and pressure stabilizing, and water resource recycling and nutrient ingredient recycling are achieved. The integrated device can realize continuous whole process of enteromorpha treatment, is high in winding resistance and remarkable in dehydration reduction effect, has both environmental protection and resource recovery values, and is suitable for large-scale enteromorpha burst emergency treatment and resource utilization scenes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of marine environmental protection equipment, and particularly relates to an integrated device for salvaging and dewatering Enteromorpha and recycling press liquid in a closed loop. BACKGROUND

[0002] The outbreak of Enteromorpha green tide poses a serious threat to coastal ecology, economy and social activities. Its large-scale aggregation and decay not only seriously damages coastal landscape, tourism and aquaculture, but also consumes a large amount of dissolved oxygen and may release harmful substances, directly threatening the health of the nearshore ecosystem. Therefore, developing efficient and environmentally friendly Enteromorpha disaster emergency disposal technology and equipment is of great significance for marine ecological environment protection and disaster prevention and reduction. At present, the management of Enteromorpha mainly relies on salvaging at sea, supplemented by a small amount of resource utilization attempts. However, the traditional salvaging equipment is easy to be clogged by algae and has low efficiency, and the salvaging products have extremely high water content, resulting in huge transportation and disposal costs and easy spoilage. More importantly, the high-nutrient press liquid generated during the dewatering process will cause secondary pollution in local waters if directly discharged into the sea.

[0003] Therefore, there is an urgent need in the current Enteromorpha management field for an innovative technology and equipment that can integrate efficient anti-winding salvaging, immediate dewatering and reduction, harmless treatment and resource recycling of press liquid in a closed loop, in order to break through the bottleneck of existing technology and realize the unity of environmental benefits and operational efficiency. SUMMARY

[0004] The present application provides an integrated device for salvaging and dewatering Enteromorpha and recycling press liquid in a closed loop, to solve the core problems of easy clogging of Enteromorpha salvaging, difficulty in dewatering algae, secondary pollution of press liquid and fragmentation of treatment links in the prior art.

[0005] To achieve the above-mentioned purpose, the following technical solutions are adopted in the present application:

[0006] An integrated device for salvaging and dewatering Enteromorpha and recycling press liquid in a closed loop, comprising a pair of roller traction mechanism, a conveying mechanism, a dewatering and reduction mechanism, and a liquid treatment and recycling mechanism; the pair of roller traction mechanism is used for salvaging Enteromorpha; the conveying mechanism is connected to the discharge end of the pair of roller traction mechanism and used for conveying Enteromorpha; the dewatering and reduction mechanism is connected to the discharge end of the conveying mechanism and used for dewatering Enteromorpha to realize preliminary solid-liquid separation; the liquid treatment and recycling mechanism is connected to the liquid outlet end of the dewatering and reduction mechanism and used for further separating the liquid obtained by preliminary dewatering to produce dischargeable fresh water and resource-utilizable nutrient-rich concentrated liquid.

[0007] Optionally, the pair of roller traction mechanism comprises a wide-mouthed flow guide shell and a pair of roller traction structure, the wide-mouthed flow guide shell is located at the most front end of the pair of roller traction mechanism and has an expanding trumpet-shaped entrance, and the pair of roller traction structure is installed at the outlet end of the wide-mouthed flow guide shell.

[0008] Optionally, the roller traction structure includes rollers, support frames, and first drive motors. There are two rollers, arranged side by side at the outlet end of the wide-mouth guide shroud; there are two support frames, located at both ends of the rollers; there are two first drive motors, located at the middle of the sides of the two support frames; the two first drive motors drive the two rollers to rotate in opposite directions through a drive gearbox.

[0009] Optionally, the conveying mechanism includes a U-shaped conveying trough, a shaftless spiral, a housing, a first driving device, and a first discharge port. The front end of the U-shaped conveying trough is connected to the outlet end of the roller traction mechanism. The shaftless spiral is located inside the conveying trough. The housing is covered at the rear end of the U-shaped conveying trough. The first driving device is located at the rear end of the housing and is connected to the shaftless spiral for transmission. The first discharge port is located at the bottom of the housing.

[0010] Optionally, the conveying mechanism is installed at an inclined angle from front to back and upward.

[0011] Optionally, the dehydration and volume reduction mechanism includes a feed box, a cylindrical shell, spiral blades, a spiral shaft, a second drive device, a second discharge port, a first collection tank, and a screen. The feed box is installed on the upper side of the front end of the cylindrical shell, the spiral shaft is fixedly installed at the center of the interior of the cylindrical shell, and the spiral blades are wound around the spiral shaft. The second drive device is fixedly installed on the outer side of the rear end of the cylindrical shell and is connected to the spiral shaft for transmission. The second discharge port is located on the lower side of the rear end of the cylindrical shell and is used to discharge the blocky algae cake obtained by spiral separation. The screen is set on the lower side of the cylindrical shell, and the first collection tank is fixedly installed directly below the screen.

[0012] Optionally, the pitch of the helical blades gradually decreases from the front end to the rear end of the helical shaft.

[0013] Optionally, the slit width of the screen is 0.3-0.5 mm; the screen is made of wear-resistant stainless steel, has long strip slits, and an opening rate of 10%-20%.

[0014] Optionally, the liquid treatment and recovery mechanism includes a rotary drum screen body, a buffer tank, a second collection tank, a high-pressure pump body, and a reverse osmosis membrane assembly. A second drive motor is provided on the outer front end of the rotary drum screen body, a first water inlet is provided on the upper front end, and a third discharge outlet is provided on the outer rear end. The second collection tank is fixedly installed below the rotary drum screen body and is connected to the reverse osmosis membrane assembly in sequence through the buffer tank and the high-pressure pump body. A second liquid outlet is provided at the lower rear end of the reverse osmosis membrane assembly, and a third liquid outlet is provided at the higher front end.

[0015] Optionally, the main body of the rotary drum screen is installed at a downward angle from the front end to the rear end.

[0016] The integrated device for harvesting, dehydrating, and recycling the pressing liquid of *Ulva prolifera* of the present invention has at least the following beneficial effects:

[0017] (1) Breakthrough optimization of anti-entanglement performance: This invention achieves the transformation from passive collection to active grasping by adopting an innovative design that combines "roller active traction" and "shaftless spiral conveying". The roller unit can forcibly grasp and initially break up algae clumps, while the shaftless spiral, due to its structural characteristics of having no central shaft, can only be forcibly pushed by the flexible spiral blades. In principle, this eliminates the problem of algae fiber entanglement and blockage, ensuring that marine salvage operations can be carried out continuously and stably for a long time, greatly reducing the frequency of downtime cleaning and maintenance costs, improving pure operation efficiency, and solving the core pain point of operation interruption of existing equipment.

[0018] (2) High efficiency and stable dehydration and weight reduction effect: The present invention adopts an innovative design of a two-stage dehydration structure that combines "shaftless spiral preliminary dehydration + spiral extrusion deep dehydration". By integrating a variable pitch spiral extrusion dehydrator, the seaweed is subjected to strong mechanical dehydration at the harvesting point, which can quickly reduce its moisture content to below 60%, and its volume and weight are sharply reduced. This directly avoids the ineffective cost of transporting a large amount of water and greatly reduces the burden of subsequent transportation, storage and disposal. At the same time, the screen aperture and opening rate are scientifically matched to avoid the loss of algal residue and ensure the rapid discharge of the pressing liquid. Meanwhile, the wear-resistant lining strips arranged longitudinally on the inner wall of the screen can prevent the algae from rotting due to the synchronous rotation of the material and the screen, ensuring a smooth dehydration process. Finally, a blocky algal cake with high density and low moisture content is obtained, with a significant weight reduction effect, which greatly reduces the cost of subsequent transportation and resource utilization.

[0019] (3) Outstanding resource recycling and environmental protection: This invention innovatively designs a whole-process treatment unit for press liquor of "rotary drum screen pretreatment + reverse osmosis membrane deep separation". This solution not only recovers and reuses fiber residue through the rotary drum screen, but more importantly, it accurately separates the press liquor into fresh water that can be safely discharged and concentrated liquid rich in nutrients through reverse osmosis technology, truly realizing "zero wastewater discharge" and "resource utilization of pollutants", minimizing the environmental footprint of the treatment process itself, and avoiding the problem of secondary eutrophication of local water areas caused by direct discharge of press liquor in traditional methods.

[0020] (4) High system integration: This invention innovatively integrates three core functional mechanisms: anti-entanglement retrieval, immediate dehydration, and closed-loop treatment of pressing liquid into one, which can be mounted on ships or mobile platforms, realizing seamless connection from sea collection to the production of primary resource products (algae cake, concentrate). This integrated design changes the previous fragmented and inefficient model, and provides a mobile, efficient, and easy-to-deploy large-scale seaweed control system solution.

[0021] (5) Achieve high utilization of seaweed resources: The produced seaweed cake has low water content and stable morphology, and the nutrients in the pressing liquid are concentrated and recovered, which makes the subsequent production of organic fertilizer, feed additives or extraction of bioactive substances and other resource utilization pathways lower in cost, easier to implement, and more controllable in product quality, thereby effectively enhancing the economic sustainability of seaweed control projects and promoting a virtuous cycle of environmental protection and economy. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the integrated device according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the roller traction mechanism according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the shaftless conveying mechanism according to an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the dehydration and weight reduction mechanism according to an embodiment of the present invention;

[0027] Figure 5 This is a first structural schematic diagram of the liquid treatment and recovery mechanism according to an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the second structure of the liquid treatment and recovery mechanism according to an embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the working process of the integrated device according to an embodiment of the present invention.

[0030] Figure label:

[0031] 1. Roller traction mechanism; 101. Wide-mouth guide shroud; 102. Roller; 103. Support frame; 104. Drive gearbox; 105. First drive motor; 2. Conveying mechanism; 201. Conveying trough; 202. Shaftless spiral; 203. Drive shaft; 204. Casing; 205. Thrust bearing; 206. First drive device; 207. First discharge port; 208. First connecting pipe; 3. Dehydration and weight reduction mechanism; 301. Feed box; 302. Cylindrical outer shell; 303. Spiral blades; 304. Spiral shaft; 305. Second drive device; 306. Shaft 307. Support; 308. Fixing auxiliary component; 309. Second discharge port; 310. First collection tank; 4. Screen; 4. Liquid treatment and recovery mechanism; 401. Second drive motor; 402. First water inlet; 403. Rotary drum screen body; 404. Third discharge port; 405. First liquid outlet; 406. Buffer water tank; 407. Second collection tank; 408. High-pressure pump body; 409. Reverse osmosis membrane module; 410. Second liquid outlet; 411. Third liquid outlet; 412. Second connecting pipe; 413. Third drive motor; 414. Third connecting pipe. Detailed Implementation

[0032] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the basic embodiments disclosed below.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0034] like Figure 1 As shown, the integrated device for harvesting, dehydrating, and recycling the pressed liquid of *Ulva prolifera* according to an embodiment of the present invention includes a roller traction mechanism 1, a conveying mechanism 2, a dehydration and volume reduction mechanism 3, and a liquid treatment and recovery mechanism 4. The roller traction mechanism 1 is located at the front end of the integrated device and is used to harvest *Ulva prolifera*. The conveying mechanism 2 is connected to the rear end (discharge end) of the roller traction mechanism 1 and is used to convey *Ulva prolifera*. The dehydration and volume reduction mechanism 3 is connected to the lower side (discharge end) of the conveying mechanism 2 and is used to dehydrate *Ulva prolifera* to achieve preliminary solid-liquid separation. The liquid treatment and recovery mechanism 4 is connected to the discharge end below the dehydration and volume reduction mechanism 3 and is used to further separate the liquid obtained from the preliminary dehydration, ultimately producing dischargeable freshwater and resource-utilizable nutrient-rich concentrate, achieving low pollution and resource recovery.

[0035] like Figure 2 As shown, the roller traction mechanism 1 includes a wide-mouth guide shroud 101, rollers 102, a support frame 103, a drive gearbox 104, and a first drive motor 105. The wide-mouth guide shroud 101 is located at the foremost end of the roller traction mechanism 1, i.e., the foremost end of the integrated device. This wide-mouth guide shroud 101 is a wide-mouth suction-type funnel-shaped inlet with an flared structure, which increases the area for absorbing the seaweed, improves harvesting efficiency, and avoids algae accumulation caused by excessively high local flow rates. The rollers 102, support frame 103, drive gearbox 104, and first drive motor 105 constitute a roller traction structure, located at the outlet end behind the wide-mouth guide shroud 101. Through the relative rotation of the paired rollers 102, the absorbed seaweed is initially combed and pulled, providing a stable feed for the subsequent conveying module. Specifically, there are two rollers 102, arranged side-by-side at the outlet end of the wide-mouth guide shroud 101. The rollers 102 have wear-resistant protrusions to increase friction. There are two support frames 103, located at both ends of the two rollers 102. There are four drive gearboxes 104, evenly distributed on both sides of the support frames 103. There are two first drive motors 105, located at the center of the sides of the two support frames 103. The two first drive motors 105 are connected to the ends of the two rollers 102 via the two drive gearboxes 104 on the corresponding support frames 103, enabling synchronous rotation of the two rollers 102 in opposite directions. This effectively grasps and breaks up the *Ulva prolifera* clumps, which then enter the conveying mechanism 2 after initial crushing.

[0036] like Figure 3As shown, the conveying mechanism 2 includes a U-shaped conveying trough 201, a shaftless spiral 202, a housing 204, a first driving device 206, and a first discharge port 207. The front end of the U-shaped conveying trough 201 is connected to the outlet end of the roller traction mechanism 1, and the shaftless spiral 202 is located inside the conveying trough 201. The housing 204 covers the rear end of the U-shaped conveying trough 201, and a drive shaft 203 is connected to the rear end of the shaftless spiral 202. A thrust bearing 205 is mounted on the drive shaft 203. The housing 204 surrounds the drive shaft 203 and the thrust bearing 205. The first driving device 206 is fixedly installed on the outside of the housing 204 and is connected to the shaftless spiral 202 via the drive shaft 203 to drive the shaftless spiral 202 to rotate. The first discharge port 207 is connected to the bottom of the housing 204, and a first connecting pipe 208 is connected to the lower end of the first discharge port 207. The feed end of the conveying mechanism 2 is connected to the discharge end of the roller traction mechanism 1, which is used to receive and convey the seaweed that has been grabbed. Specifically, the seaweed clumps grabbed by the roller traction mechanism 1 are initially crushed and then enter the U-shaped conveying trough 201. They are continuously conveyed by the shaftless spiral 202 under the drive of the first driving device 206. They are discharged from the end of the U-shaped conveying trough 201 through the first discharge port 207 and enter the dehydration and reduction mechanism 3 through the first connecting pipe 208.

[0037] Optionally, the conveying mechanism 2 and the roller traction mechanism 1 are installed at an upward inclined angle (e.g., 30°) to reduce water volume at the source. Specifically, the front end of the U-shaped conveying trough 201 and the shaftless spiral 202 connects to the roller traction mechanism 1, and the rear end gradually increases in height, allowing the water in the algae clumps grasped by the roller traction mechanism 1 to flow back, thereby reducing the amount of water carried in the conveyed Ulva algae clumps. Furthermore, the inner wall of the U-shaped conveying trough 201 is lined with ultra-high molecular weight polyethylene (UHMW-PE) sheets, utilizing their extremely low coefficient of friction and self-lubricating properties to prevent Ulva algae adhesion, ensuring that the Ulva algae clumps are transported without sticking. Moreover, the conveying mechanism 2 uses a shaftless spiral 202 without a central shaft, which prevents the Ulva algae from tangling during transport.

[0038] like Figure 4As shown, the dehydration and weight reduction mechanism 3 includes a feed box 301, a cylindrical shell 302, spiral blades 303, a spiral shaft 304, a second drive device 305, a bearing seat 306, a fixing auxiliary component 307, a second discharge port 308, a first liquid collection tank 309, and a screen 310. The feed box 301 is installed on the upper side of the front end of the cylindrical shell 302 and is used to connect to the first discharge port 207 of the conveying mechanism 2 through the first connecting pipe 208. The spiral shaft 304 is fixedly installed at the center of the inside of the cylindrical shell 302. The spiral shaft 304 is provided with spiral blades 303 with a pitch that gradually decreases from the feed end to the discharge end. The variable pitch spiral blades can generate progressive mechanical extrusion force on the material. The large pitch at the feed end can quickly feed and convey the material, while the small pitch at the discharge end can generate large extrusion force. The second drive unit 305 is fixedly installed on the outer rear end of the cylindrical shell 302 and is connected to the screw shaft 304 for transmission. The second drive unit 305 is fixedly installed with a bearing seat 306 and a fixing auxiliary component 307 for supporting and fixing the high-speed, heavy-load screw shaft 304. The second discharge port 308 is located on the lower side of the rear end of the cylindrical shell 302. The structural dimensions of the second discharge port 308 are adapted to the minimum pitch area of ​​the screw shaft 304, constraining the extruded solids. Together with the screw extrusion force, the solids are formed into block algae cakes with a moisture content of less than 60%. A solid collection container can be connected to the second discharge port 308, and the block algae cakes obtained by screw extrusion separation are discharged from the second discharge port 308. A screen 310 is provided on the lower side of the cylindrical outer shell 302. The screen 310 covers the working area of ​​the spiral shaft 304 and is located in most of the lower half of the cylindrical outer shell 302. The slit width of the screen 310 is 0.1-0.5mm, preferably 0.3-0.5mm. The screen 310 can be made of wear-resistant stainless steel and has long strip slits with an opening rate of 10%-20%. It is used to discharge the pressing liquid and retain solids during the pressing process. The first liquid collection tank 309 is fixedly installed directly below the screen 310.

[0039] The conveying mechanism 2 conveys seaweed to the cylindrical shell 302 via the first connecting pipe 208. The second driving device 305 drives the spiral shaft 304 to rotate the variable pitch spiral blades 303, which can generate gradually increasing extrusion pressure to squeeze the seaweed, so that the seaweed can be dehydrated gradually. The squeezed liquid flows into the first collection tank 309 through the screen 310 below, and the squeezed solid seaweed is discharged from the second discharge port 308 at the rear end.

[0040] like Figure 5 and Figure 6As shown, the liquid treatment and recovery mechanism 4 includes a second drive motor 401, a first inlet 402, a rotary drum screen body 403, a third outlet 404, a first liquid outlet 405, a buffer tank 406, a second collection tank 407, a high-pressure pump body 408, a reverse osmosis membrane module 409, a second liquid outlet 410, a third liquid outlet 411, a second connecting pipe 412, a third drive motor 413, and a third connecting pipe 414; wherein, the rotary drum screen body 403 is used to intercept and remove fibrous algal residue from the pressing liquid, preventing algal residue from entering. The subsequent pipeline caused a blockage, and the main body of the rotary drum screen 403 was installed at a downward angle with the front higher than the back. The first end (the end near the liquid inlet) was fixedly installed with the second drive motor 401. The first water inlet 402 was located on the upper side of the front end (higher end) of the rotary drum screen 403 and was used to connect to the first liquid collection tank 309 of the dehydration and reduction mechanism 3 to receive the pressing liquid generated by the dehydration and reduction mechanism 3. The third discharge port 404 was located at the rear end (lower end) of the rotary drum screen 403. The algae residue obtained after the pressing liquid was processed by the rotary drum screen was discharged from the third discharge port 404.

[0041] The second collection tank 407 is fixedly installed on the lower side of the drum screen body 403. The lower end of the second collection tank 407 is fixedly connected to the buffer tank 406 through the first outlet 405. The buffer tank 406 is connected to the high-pressure pump body 408 through the third connecting pipe 414. The buffer tank 406 is located between the outlet of the drum screen body 403 and the inlet of the high-pressure pump body 408. Its core function is to receive and buffer the fluctuating water flow in the previous treatment, and to provide stable flow and pressure of water to the high-pressure pump body 408 and the reverse osmosis membrane module 409 through homogenization and equalization. At the same time, it uses the residence time to achieve gas-liquid separation, prevents gas from entering the subsequent precision equipment and causing cavitation or membrane damage, and provides the necessary operating buffer space for system start-up, shutdown and flushing, thereby ensuring the continuity, stability and safety of the entire press liquor treatment chain.

[0042] A third drive motor 413 is provided on the side of the high-pressure pump body 408. The outlet end of the high-pressure pump body 408 is connected to the reverse osmosis membrane module 409 through a second connecting pipe 412. The high-pressure pump body 408 is located between the buffer tank 406 and the reverse osmosis membrane module 409, and is used to pressurize the filtered clear liquid in the buffer tank 406 to provide the required pressure for separation by the reverse osmosis membrane module 409. A second outlet 410 is provided at the lower rear end (outlet end) of the reverse osmosis membrane module 409, and a third outlet 411 is provided at the higher front end of the reverse osmosis membrane module 409. The reverse osmosis membrane module 409 is used to separate the pressurized filtered clear liquid into fresh water and concentrated nutrient solution. The concentrated nutrient solution is rich in nutrients such as nitrogen and phosphorus from the seaweed, which can be recycled.

[0043] The Ulva prolifera pressing liquid generated by the dehydration and reduction mechanism 3 flows into the main body of the rotary drum screen 403 through the first inlet 402 for solid-liquid separation again. The separated algae residue is discharged through the third outlet 404. The separated filtered clear liquid enters the buffer tank 406 through the first outlet 405. In the buffer tank 406, the flow rate is balanced and the pressure is stabilized. Then, it enters the high-pressure pump body 408 through the third connecting pipe 414. After being pressurized by the high-pressure pump body 408, it enters the reverse osmosis membrane module 409 through the second connecting pipe 412 for further separation. The permeate water flows out from the third outlet 411, and the retained concentrate flows out from the second outlet 410.

[0044] In practical applications, the drive motor, rollers, shaftless spiral, variable pitch spiral blades, screen, rotary drum screen, high-pressure pump, reverse osmosis membrane module, and other components or equipment of the integrated device for harvesting, dehydrating, and recycling the press liquid of *Ulva prolifera* in this embodiment of the invention can be made from existing equipment with corresponding functions. The wide-mouth guide hood, support frame, U-shaped conveying trough, liquid collection tank, casing, buffer tank, and other components can be made from relevant existing equipment or materials according to the needs of actual working conditions. Furthermore, other equipment or components can be added to the integrated device for harvesting, dehydrating, and recycling the press liquid in a closed loop, or the actual placement of each piece of equipment or component can be adjusted to achieve the actual application or other functions of the system.

[0045] According to exemplary embodiments of the present invention, such as Figure 7 As shown, the workflow of the integrated device for harvesting, dehydrating, and recycling the pressing liquid of *Ulva prolifera* according to an embodiment of the present invention may include:

[0046] S1, Active Grabbing and Untangled Conveying: First, the seaweed on the sea surface is hauled away by the roller traction mechanism 1. The wide-mouthed guide hood 101 is submerged about 0.5 meters underwater to collect the floating seaweed. The roller traction structure actively grabs the algae clumps and performs preliminary crushing. Then, the preliminary crushed seaweed is conveyed by the shaftless conveying mechanism 2 connected to the roller traction mechanism 1, achieving continuous and stable conveying without clogging, and providing continuous feed for subsequent processing.

[0047] S2, Instantaneous Screw Extrusion Dehydration and Solid-Liquid Separation: The delivered seaweed enters the feed box 301 of the dehydration and weight reduction mechanism 3, and solid-liquid separation is achieved through extrusion and conveying by the screw shaft 304 and variable-pitch screw blades 303. This step simultaneously produces two streams: blocky seaweed cake with a moisture content of less than 60% and nutrient-rich pressing liquid; the solid is pressed into blocky seaweed cake and discharged from the second discharge port 308, entering the packaging and storage stage; the liquid is collected as pressing liquid through the screen 310 by the first collection tank 309, entering the recycling process.

[0048] S3, pre-separation of solid and liquid in the press liquid: all the press liquid produced by the initial solid-liquid separation enters the main body of the rotary drum screen 403 for pretreatment. Here, the "fibrous algae residue" remaining in the liquid is intercepted and separated, and discharged and collected through the third discharge port 404. The separated "filtered clear liquid" is collected by the second collection tank 407 and enters the subsequent deep treatment stage through the first liquid outlet 405.

[0049] S4, Clarified Liquid Pressure Stabilization and Membrane Separation: The filtered clarified liquid first enters the buffer tank 406 for flow equalization and pressure stabilization. Then, it is pressurized to the pressure required for reverse osmosis membrane operation by the high-pressure pump body 408 and pumped into the reverse osmosis membrane module 409. In the reverse osmosis module, the clarified liquid is finely separated to produce two resource-based products: one is concentrated nutrient solution, which is discharged through the second outlet 410 and can be connected to the concentrated solution storage tank for storage; the other is fresh water, which is discharged through the third outlet 411 and, after testing, can be directly and evenly discharged back into the sea.

[0050] S5, Product Classification, Disposal and Resource Utilization Path: The blocky algae cake produced in step S2 is collected, packaged, stored and transported ashore for resource utilization; the concentrated nutrient solution produced in step S4 is collected in a special storage tank and transported ashore for high-value resource utilization; at the same time, the freshwater produced in step S4 is collected, and after passing freshwater testing, it is safely discharged back into the sea in a uniform manner to completely eliminate secondary pollution.

[0051] It should be noted that, depending on the implementation needs, the various components described in the embodiments of the present invention can be split into more components, or two or more components or parts of components can be combined into new components to achieve the purpose of the embodiments of the present invention.

[0052] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An integrated device for harvesting, dehydrating, and recycling the pressing liquid of *Ulva prolifera*, characterized in that, It includes a roller traction mechanism (1), a conveying mechanism (2), a dehydration and volume reduction mechanism (3), and a liquid treatment and recovery mechanism (4). The roller traction mechanism (1) is used to harvest seaweed; The conveying mechanism (2) is connected to the discharge end of the roller traction mechanism (1) and is used to convey seaweed; The dehydration and reduction mechanism (3) is connected to the discharge end of the conveying mechanism (2) and is used to dehydrate the seaweed to achieve preliminary solid-liquid separation. The liquid treatment and recovery mechanism (4) is connected to the liquid outlet of the dehydration and volume reduction mechanism (3) for further separation of the liquid obtained from the initial dehydration, producing fresh water that can be discharged and nutrient concentrate that can be utilized as a resource.

2. The integrated device for harvesting, dehydrating, and recycling the pressing liquid of *Ulva prolifera* according to claim 1, characterized in that, The roller traction mechanism (1) includes a wide-mouth guide shroud (101) and a roller traction structure. The wide-mouth guide shroud (101) is located at the front end of the roller traction mechanism (1) and has a flared horn-shaped inlet. The roller traction structure is installed at the outlet end of the wide-mouth guide shroud (101).

3. The integrated device for harvesting, dehydrating, and recycling the pressing liquid of *Ulva prolifera* according to claim 2, characterized in that, The roller traction structure includes rollers (102), support frames (103), and first drive motors (105). There are two rollers (102), which are arranged side by side at the outlet end of the wide-mouth guide shroud (101). There are two support frames (103), which are located at both ends of the rollers (102). There are two first drive motors (105), which are located at the middle of the sides of the two support frames (103). The two first drive motors (105) drive the two rollers (102) to rotate in opposite directions through a drive gearbox.

4. The integrated device for harvesting, dehydrating, and recycling the pressing liquid of *Ulva prolifera* according to claim 1, characterized in that, The conveying mechanism (2) includes a U-shaped conveying trough (201), a shaftless spiral (202), a housing (204), a first driving device (206), and a first discharge port (207). The front end of the U-shaped conveying trough (201) is connected to the outlet end of the roller traction mechanism (1). The shaftless spiral (202) is located inside the conveying trough (201). The housing (204) covers the rear end of the U-shaped conveying trough (201). The first driving device (206) is located at the rear end of the housing (204) and is connected to the shaftless spiral (202). The first discharge port (207) is located at the bottom of the housing (204).

5. The integrated device for harvesting, dehydrating, and recycling the pressing liquid of *Ulva prolifera* according to claim 4, characterized in that, The conveying mechanism (2) is installed at an angle that is tilted from front to back and upward.

6. The integrated device for harvesting, dehydrating, and recycling the pressing liquid of *Ulva prolifera* according to claim 1, characterized in that, The dehydration and volume reduction mechanism (3) includes a feed box (301), a cylindrical shell (302), spiral blades (303), a spiral shaft (304), a second drive device (305), a second discharge port (308), a first collection tank (309), and a screen (310). The feed box (301) is installed on the upper side of the front end of the cylindrical shell (302), the spiral shaft (304) is fixedly installed at the center of the interior of the cylindrical shell (302), and the spiral blades (303) are wound around the spiral shaft (304). The second drive device (305) is fixedly installed on the outer side of the rear end of the cylindrical shell (302) and is connected to the spiral shaft (304) for transmission. The second discharge port (308) is located on the lower side of the rear end of the cylindrical shell (302) and is used to discharge the blocky algae cake obtained by spiral separation. The screen (310) is set on the lower side of the cylindrical shell (302), and the first collection tank (309) is fixedly installed directly below the screen (310).

7. The integrated device for harvesting, dehydrating, and recycling the pressing liquid of *Ulva prolifera* according to claim 6, characterized in that, The pitch of the helical blade (303) gradually decreases from the front end to the rear end of the helical shaft (304).

8. The integrated device for harvesting, dehydrating, and recycling the pressing liquid of *Ulva prolifera* according to claim 6, characterized in that, The slit width of the screen (310) is 0.3-0.5 mm; the screen (310) is made of wear-resistant stainless steel and has long strip slits with an opening rate of 10%-20%.

9. The integrated device for harvesting, dehydrating, and recycling the pressing liquid of *Ulva prolifera* according to claim 1, characterized in that, The liquid treatment and recovery mechanism (4) includes a rotary drum screen body (403), a buffer water tank (406), a second liquid collection tank (407), a high-pressure pump body (408), and a reverse osmosis membrane assembly (409). A second drive motor (401) is provided on the outer side of the front end of the rotary drum screen body (403), a first water inlet (402) is provided on the upper side of the front end, and a third discharge port (404) is provided on the outer side of the rear end. The second liquid collection tank (407) is fixedly installed below the rotary drum screen body (403) and is connected to the reverse osmosis membrane assembly (409) in sequence through the buffer water tank (406) and the high-pressure pump body (408). A second liquid outlet (410) is provided at the lower rear end of the reverse osmosis membrane assembly (409), and a third liquid outlet (411) is provided at the higher front end.

10. The integrated device for harvesting, dehydrating, and recycling the pressing liquid of *Ulva prolifera* according to claim 9, characterized in that, The main body of the rotary drum screen (403) is installed at an angle that slopes downwards from the front end to the rear end.

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