Method and equipment for salvaging and dewatering cyanobacterial blooms on water surfaces

Abstract

This invention belongs to the field of water pollution control technology, specifically a method and equipment for harvesting and dehydrating cyanobacterial blooms on the water surface. The method includes a seine net boat, connecting rods, a net enclosure, and a drying vessel. Multiple net enclosures are connected to each other via connecting rods. The connecting rods are connected to the seine net boat via ropes on both sides. The seine net boat is remotely controlled by personnel to navigate the water surface and encircle and shrink the cyanobacterial blooms. The drying vessel includes a conveying system, a drying system, and a storage system. This invention allows different personnel to operate the seine net boat to gather the cyanobacterial blooms into one or more gathering points. The drying vessel then travels to these gathering points to harvest and dry the gathered cyanobacterial blooms. This method is highly efficient, and the drying vessel does not need to travel back and forth on the water surface, resulting in lower resource consumption.

Description

Technical Field

[0001] This invention belongs to the field of water pollution control technology, specifically a method and equipment for removing and dehydrating blue-green algae blooms on the water surface. Background Technology

[0002] As domestic sewage and industrial and agricultural wastewater carry pollutants such as nitrogen and phosphorus into lakes, the eutrophication of lakes is constantly intensifying, and the prevention and control of eutrophication has become a global challenge.

[0003] Eutrophication of water bodies easily leads to cyanobacterial blooms, causing algal blooms, red tides, oxygen depletion, and fish deaths. Algae can also release toxins that endanger water safety. Removing cyanobacteria can not only improve the aquatic landscape and promote aquatic ecological balance, but also remove pollutants such as nitrogen and phosphorus from the water, thus reducing the degree of eutrophication.

[0004] There are three categories of methods for cleaning up cyanobacteria: the first is to directly remove cyanobacteria from the water, i.e., the cyanobacteria harvesting method; the second is to directly kill cyanobacteria in the water, such as using electrocatalytic technology to remove algae, modified clay technology to remove algae, chemical methods to remove algae, microbial methods to remove algae, biological enzyme methods to remove algae, and ultrasonic methods to kill algae; and the third is to inhibit the growth of cyanobacteria, such as using plants to inhibit algae and using fish to control algae.

[0005] The most direct and effective method is the first method of cyanobacteria harvesting. However, the existing cyanobacteria harvesting process requires the harvesting boat to move back and forth on the water surface to harvest the algae. The harvesting area of ​​the harvesting boat is limited, and it is necessary to go back and forth many times to complete the harvesting of the cyanobacteria bloom. The harvesting efficiency is low. In addition, the buoyancy of cyanobacteria blooms is strongest in the early morning, which is also the best time for harvesting. The traditional harvesting method is too inefficient and it is easy to miss the best harvesting time, which increases the difficulty of subsequent harvesting and consumes more resources.

[0006] Therefore, it is essential to study a method that can quickly and efficiently remove cyanobacterial blooms within the optimal dredging time. Summary of the Invention

[0007] To address the shortcomings and solve the problems of low salvage efficiency and high resource consumption of existing salvage vessels.

[0008] The technical solution adopted by this invention to solve its technical problem is as follows: A surface cyanobacteria bloom harvesting and dehydration treatment device, comprising a net-pulling boat, connecting rods, netting, and a drying boat; the netting is multiple, preferably nylon mesh or nylon filter net; the connecting rods are preferably made of lightweight hard plastic material; adjacent netting are connected by connecting rods, and the net-pulling boat is connected to both sides of the connecting rods by ropes; the net-pulling boat is remotely controlled by personnel to navigate on the water surface; after multiple netting are connected by connecting rods, the net-pulling boat is connected to both sides of the connecting rods by ropes to enclose and shrink the cyanobacteria bloom; the drying boat includes a conveying system, a drying system, and a storage system; the conveying system is used to transport the cyanobacteria bloom surrounded by the netting from the water surface to the drying system of the drying boat; the drying system is used to dry and dehydrate the cyanobacteria bloom; the storage system is used to store the cyanobacteria bloom treated by the drying system.

[0009] Preferably, the connecting rod has grooves on both sides; each section of the enclosure is provided with a pull rope, which is made of nylon and has multiple strands. Steel rope can also be used depending on the actual use. The pull rope is fixed to two ends of the left and right sides of the enclosure with sliders, which are matched with the grooves; the sliders are internally threaded with fixing bolts for fixing after the enclosure is opened.

[0010] Preferably, the connecting rod has a crescent-shaped design.

[0011] Preferably, a counterweight is threaded to the bottom of the connecting rod, and the counterweight is made of metal or high-quality rubber-like material; a vertically arranged expansion groove is formed inside the connecting rod; the bottom of the expansion groove is connected to the outside through a water inlet formed inside the connecting rod; an expansion membrane is fixedly connected to the top opening of the expansion groove on the connecting rod, and the expansion membrane is preferably made of latex material; the expansion membrane is located in the upper middle part of the convex arc-shaped sidewall of the connecting rod.

[0012] Preferably, an expansion block is slidably connected inside the expansion tank, and a sealing ring is fitted onto the surface of the expansion block to form a piston-like structure; two sets of retaining rings are provided on the side wall of the expansion tank, one set located below the expansion membrane and the other set located above the water inlet; an air inlet is fixedly connected to the side wall of the connecting rod; the air inlet communicates with the expansion tank, and the communication point is located between the upper retaining ring and the expansion membrane; a one-way valve is provided inside the air inlet.

[0013] Preferably, the inlet is internally threaded and sealed with a filter tube, and a filter screen is installed inside the filter tube. The filter screen has a multi-layer design.

[0014] Preferably, the monitoring rod is fixedly connected to the outwardly protruding arc-shaped sidewall of the connecting rod.

[0015] Preferably, the surface of the monitoring rod is provided with multiple boundary layers, and each boundary layer contains fluorescent liquid or pigment of different colors.

[0016] A method for removing and dehydrating cyanobacterial blooms on the water surface includes the following steps:

[0017] S1: Personnel drive a drying boat to any location on the lake surface and use a drone to carry a tank containing polyaluminum chloride (PAC) flocculant to spray the cyanobacterial bloom on the water surface, fixing the cyanobacterial bloom to the water surface.

[0018] S2: Connect the corresponding number of net sections to the connecting rods according to the required salvage area to form a complete net; the connecting rods on both sides of the complete net are connected to the net-pulling boats by ropes respectively;

[0019] S3: By using a net-pulling boat, the cyanobacterial bloom water inside the net is filtered and concentrated, so that the large area of ​​cyanobacterial bloom is concentrated in the small area of ​​the net.

[0020] S4: The drying vessel moves to the netting location, or a net-pulling boat moves the cyanobacterial bloom to the drying vessel. The cyanobacterial bloom is then transported to the drying system via the drying vessel's conveying system. After drying, the algal sludge is formed and stored in the storage system. Once the drying vessel docks, the algal bloom is moved ashore for further processing.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. The present invention discloses a method and equipment for harvesting and dehydrating cyanobacterial blooms on the water surface. A net-pulling boat drives the net across the water surface, where the net gathers the cyanobacterial blooms both on and underwater. At this point, a drying vessel can quickly harvest and dry the gathered cyanobacterial blooms. Since multiple combined nets can be deployed on a single lake surface, different personnel can operate the net-pulling boat to gather the cyanobacterial blooms into one or more gathering points. The drying vessel only needs to travel to the gathering point to harvest and dry the gathered cyanobacterial blooms. The harvesting efficiency is high, and the drying vessel does not need to travel back and forth on the water surface, resulting in lower resource consumption.

[0023] 2. The method and equipment for harvesting and dewatering cyanobacterial blooms on the water surface described in this invention, through multiple enclosure nets and corresponding connecting rods, can be combined to form nets of different sizes according to the size of the lake surface or the content of cyanobacterial blooms, thus having a wider range of applications.

[0024] 3. The present invention provides a method and equipment for harvesting and dewatering cyanobacterial blooms on the water surface. By expanding the expansion membrane outwards to form a balloon-like suspension, the upper part of the connecting rod is suspended on the water surface while the lower part is submerged, supporting the enclosure net. This reduces the risk of the enclosure net becoming too large and tangled, causing damage and complicated subsequent processing. Simultaneously, the connecting rod forms multiple support points, ensuring the upper part of the enclosure net floats on the water surface, preventing excessive accumulation of cyanobacterial blooms from overflowing the net and preventing it from effectively trapping the blooms, thus further improving the efficiency of cyanobacterial bloom harvesting. Attached Figure Description

[0025] The invention will now be further described with reference to the accompanying drawings.

[0026] Figure 1 This is a schematic diagram of the cyanobacterial bloom aggregation after the present invention is applied;

[0027] Figure 2 This is a schematic diagram of the net-pulling boat and connecting rod in the processing equipment of the present invention;

[0028] Figure 3 This is a schematic diagram of the perimeter fence in the processing equipment of the present invention;

[0029] Figure 4 This is a cross-sectional view of the connecting rod in the processing device of the present invention;

[0030] Figure 5 This is a flowchart of the processing method of the present invention.

[0031] In the diagram: 1. Net-pulling boat; 2. Connecting rod; 21. Slide trough; 22. Expansion trough; 23. Inlet; 24. Expansion membrane; 25. Expansion block; 26. Baffle ring; 27. Air inlet; 28. Filter pipe; 3. Netting; 31. Pull rope; 32. Sliding block; 33. Fixing bolt; 4. Counterweight; 5. Monitoring rod. Detailed Implementation

[0032] The technical solution of the present invention will be further described in detail below through specific embodiments.

[0033] Example 1:

[0034] like Figure 1-3 As shown, a device for harvesting and dewatering cyanobacteria blooms on the water surface includes a net-pulling boat 1, a connecting rod 2, a net enclosure 3, and a drying boat. Multiple net enclosures 3 are included, each with a pull rope 31 passing through its upper and lower ends. Slider blocks 32 are fixedly connected to both ends of the pull ropes 31 on the left and right sides of the net enclosure 3. The connecting rod 2 has a crescent-shaped design and grooves 21 on both sides. The sliders 32 are matched with the grooves 21. Adjacent net enclosures 3 are connected by the connecting rod 2. The sliders 32 are internally threaded with fixing bolts 33 for securing the sliders 32 to the net enclosure. The net slides within the chute 21 until it is fixed after the enclosure net 3 is opened, forming a large net. The connecting rods 2 on both sides of the entire net are connected to the net-pulling boat 1 via ropes. The net-pulling boat 1 is remotely controlled by personnel to move on the water surface and enclose and shrink the cyanobacterial bloom. The drying boat includes a conveying system, a drying system, and a storage system. The conveying system is used to transport the cyanobacterial bloom enclosed by the enclosure net 3 from the water surface to the drying system of the drying boat. The drying system is used to dry and dehydrate the cyanobacterial bloom. The storage system is used to store the cyanobacterial bloom after it has been treated by the drying system.

[0035] During operation, multiple nets 3, in conjunction with corresponding connecting rods 2, can be combined to form nets of different sizes depending on the size of the lake or the content of cyanobacterial blooms, thus broadening the applicability. After the nets are assembled, a seine boat 1 moves the nets across the water surface, where they gather cyanobacterial blooms both on and underwater. At this point, a drying vessel can quickly collect and dry the gathered cyanobacterial blooms. Since multiple assembled nets can be deployed on a single lake surface, different personnel can operate the seine boat 1 to gather the cyanobacterial blooms on the water surface into one or more gathering points. The drying vessel only needs to go to the gathering point to collect and dry the gathered cyanobacterial blooms. This method is highly efficient, and the drying vessel does not need to travel back and forth on the water surface, resulting in lower resource consumption.

[0036] Example 2:

[0037] like Figure 1-4 As shown, based on Embodiment 1, a counterweight 4 is threadedly connected to the bottom of the connecting rod 2; a vertically arranged expansion groove 22 is provided inside the connecting rod 2; the bottom of the expansion groove 22 is connected to the outside through a water inlet 23 provided inside the connecting rod 2; an expansion membrane 24 is fixedly connected to the top opening of the expansion groove 22 on the connecting rod 2; the expansion membrane 24 is located in the upper middle part of the protruding arc-shaped sidewall of the connecting rod 2.

[0038] During operation, after the connecting rod 2 is placed underwater, the tension of the netting 3 causes the connecting rod 2 to move underwater. At this time, since the lower part of the connecting rod 2 is in contact with the water first, the water enters the expansion tank 22 through the inlet 23. When the water level submerges the inlet 23, the connecting rod 2 continues to move downward. At this time, the air pressure in the expansion tank 22 increases and the water level rises. The expansion membrane 24 expands outward, forming a suspension similar to a balloon. This causes the upper part of the connecting rod 2 to float on the water surface and the lower part to sink underwater, supporting the netting 3. This reduces the risk of the netting 3 becoming too large and getting tangled, causing damage to the netting 3 and complicated subsequent processing. At the same time, the connecting rod 2 forms multiple support points, causing the upper part of the netting 3 to float on the water surface, preventing the large accumulation of blue-green algae from overflowing the netting 3 and causing the netting 3 to be unable to effectively collect the blue-green algae, thus further improving the efficiency of blue-green algae harvesting.

[0039] Example 3:

[0040] like Figure 1-4 As shown, based on Embodiment 2, an expansion block 25 is slidably connected inside the expansion tank 22; two sets of retaining rings 26 are provided on the side wall of the expansion tank 22, one set located below the expansion membrane 24 and the other set located above the water inlet 23; an air inlet 27 is fixedly connected to the side wall of the connecting rod 2; the air inlet 27 communicates with the expansion tank 22, and the communication point is located between the upper retaining ring 26 and the expansion membrane 24; a one-way valve is provided inside the air inlet 27.

[0041] During operation, due to the limited air volume and buoyancy caused by the expansion tank 22, some of the upper part of the enclosure net 3 may sink to the surface, causing the accumulated algae to flow out, especially in cases of heavy algae blooms. Depending on the amount of algae, an air pump is used to inflate the expansion tank 22 through the air inlet 27 during the assembly of the enclosure net 3. At this time, the expansion block 25 is tightly pressed against the lower retaining ring 26, forming a sealed space. Continuous inflation causes the expansion membrane 24 to expand. If necessary, a heavier counterweight 4 is then added. After assembly, the enclosure is placed underwater. Because the counterweight 4 has been replaced with a heavier one, the bottom of the connecting rod 2 experiences greater gravity. After the expansion membrane 24 is inflated, the upper part of the connecting rod 2 experiences greater buoyancy, making the connecting rod 2 more stable. At the same time, the expansion membrane 24 can be inflated as needed, effectively preventing the top of the connecting rod 2 from sinking to the bottom and causing the accumulated cyanobacteria bloom to flow out. In addition, the more stable connecting rod 2 is more stable when moving in the water, preventing the accumulated cyanobacteria bloom from flowing out of the enclosure 3 below the enclosure 3 due to excessive tilt angle, further improving the efficiency of cyanobacteria bloom accumulation and harvesting.

[0042] Example 4:

[0043] like Figure 1-4 As shown in Embodiment 3, the inlet 23 is internally threaded and sealed with a filter tube 28, and a filter screen is installed inside the filter tube 28. Under long-term use, there are many underwater pollutants, which enter the expansion tank 22 through the inlet 23, seriously affecting the sliding of the expansion block 25 and making cleaning complicated and troublesome. By threading and sealing the filter screen at the inlet 23, it is possible to prevent debris from entering the expansion tank 22, and the threaded connection makes it convenient to disassemble and clean the filter screen.

[0044] Example 5:

[0045] like Figure 1-4 As shown in Embodiment 4, the connecting rod 2 has a monitoring rod 5 fixedly connected to its outwardly protruding arc-shaped sidewall. The surface of the monitoring rod 5 is provided with multiple boundary layers, each of which contains fluorescent liquid or pigment of different colors. Since the lower part of the connecting rod 2 is underwater, it is impossible to effectively observe the tilt of the connecting rod 2. During the movement of the connecting rod 2, due to the resistance of cyanobacterial blooms and water, or when underwater debris catches on the netting 3 or the connecting rod 2, the connecting rod 2 will tilt first. In severe cases, this can lead to damage to the netting 3. When the connecting rod 2 tilts, the monitoring rod 5 tilts at the same angle, and the monitoring rod 5 is above the water surface, making it easy for personnel to observe. The tilt can be checked at any time, problems can be eliminated, and the accumulation of cyanobacterial blooms can be prevented from flowing out. Through the boundary layers and the fluorescent liquid or pigment of different colors on the boundary layers, it is easier for personnel to see the tilt angle, judge the degree of danger, stop the advance of the net-pulling boat 1 in time, eliminate difficulties, improve salvage efficiency, and reduce cost consumption.

[0046] Example 6:

[0047] like Figure 1-5 As shown, a method for removing and dehydrating cyanobacterial blooms on the water surface includes the following steps:

[0048] S1: Personnel drive a drying boat to any location on the lake surface and use a drone to carry a tank containing polyaluminum chloride (PAC) flocculant to spray the cyanobacterial bloom on the water surface, fixing the cyanobacterial bloom to the water surface.

[0049] S2: Connect the corresponding number of net sections 3 to the connecting rods 2 according to the required salvage area to form a complete net; the connecting rods 2 on both sides of the complete net are connected to the net-pulling boat 1 by ropes respectively;

[0050] S3: The cyanobacteria-filtered water inside the net is concentrated by using the net-pulling boat 1, so that the large area of ​​cyanobacteria bloom is concentrated in the small area of ​​the net.

[0051] S4: The drying vessel moves to the netting location, or the cyanobacterial bloom is moved to the drying vessel by the netting boat 1. The cyanobacterial bloom is transported to the drying system through the drying vessel's conveying system. After drying in the drying system, the algal sludge is formed and stored in the storage system. After the drying vessel docks, it is moved to the shore for further processing.

[0052] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural transformations made using the contents of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. A device for harvesting and dewatering cyanobacteria blooms on water surfaces, characterized in that, The system includes a net-pulling boat (1), connecting rods (2), a netting enclosure (3), and a drying vessel. Multiple netting enclosures (3) are connected to adjacent netting enclosures via connecting rods (2). The connecting rods (2) are connected to the net-pulling boat (1) via ropes on both sides. The net-pulling boat (1) is remotely controlled by personnel to navigate on the water surface. The system is used to enclose and shrink cyanobacterial blooms. The drying vessel includes a conveying system, a drying system, and a storage system. The conveying system is used to transport the cyanobacterial blooms enclosed by the netting enclosures (3) from the water surface to the drying system of the drying vessel. The drying system is used to dry and dehydrate the cyanobacterial blooms. The storage system is used to store the cyanobacterial blooms treated by the drying system. The bottom of the connecting rod (2) is threaded with a counterweight (4); the connecting rod (2) has a vertically arranged expansion groove (22); the bottom of the expansion groove (22) is connected to the outside through a water inlet (23) opened in the connecting rod (2); an expansion membrane (24) is fixedly connected to the top opening of the expansion groove (22) of the connecting rod (2); the expansion membrane (24) is located in the upper middle part of the protruding arc sidewall of the connecting rod (2); An expansion block (25) is slidably connected inside the expansion tank (22); two sets of retaining rings (26) are provided on the side wall of the expansion tank (22), one set located below the expansion membrane (24) and the other set located above the water inlet (23); an air inlet (27) is fixedly connected to the side wall of the connecting rod (2); the air inlet (27) communicates with the expansion tank (22), and the connection point between the air inlet (27) and the expansion tank (22) is located between the expansion membrane (24) and the retaining ring (26) above; a one-way valve is provided inside the air inlet (27); The connecting rod (2) is crescent-shaped.

2. The water surface cyanobacteria bloom harvesting and dewatering treatment equipment according to claim 1, characterized in that: The connecting rod (2) has a sliding groove (21) on both sides; each of the nets (3) has a pull rope (31) passing through its upper and lower ends, and the pull rope (31) is fixed to a slider (32) at both ends of the left and right sides of the net (3), and the slider (32) is matched with the sliding groove (21); the slider (32) is threaded with a fixing bolt (33) for fixing after the slider (32) slides in the sliding groove (21) to open the net (3).

3. The water surface cyanobacteria bloom harvesting and dewatering treatment equipment according to claim 1, characterized in that: The inlet (23) is internally threaded and sealed with a filter tube (28), and a filter screen is installed inside the filter tube (28).

4. The water surface cyanobacteria bloom harvesting and dewatering treatment equipment according to claim 1, characterized in that: The monitoring rod (5) is fixed to the outwardly protruding arc-shaped sidewall of the connecting rod (2).

5. The water surface cyanobacteria bloom harvesting and dewatering treatment equipment according to claim 4, characterized in that: The surface of the monitoring rod (5) is provided with multiple layers of boundary layers, and each boundary layer contains fluorescent liquid or pigment of different colors.

6. A method for removing and dewatering cyanobacterial blooms on water surfaces, using the treatment equipment described in any one of claims 1-5, characterized in that: Includes the following steps: S1: Personnel drive the drying boat to any location on the lake surface and use a drone to carry a medicine box containing polyaluminum chloride flocculant to spray the cyanobacterial bloom on the water surface and fix the cyanobacterial bloom on the water surface. S2: Connect the corresponding number of net sections (3) to the connecting rods (2) according to the required salvage area to form a whole net. The connecting rods (2) on both sides of the whole net are connected to the net-pulling boat (1) by ropes respectively. S3: The cyanobacterial bloom in the net is filtered and concentrated by the net-pulling boat (1), so that the large area of ​​cyanobacterial bloom is concentrated in the small area of ​​the net. S4: The drying vessel moves to the net, or the cyanobacterial bloom is moved to the drying vessel by the net-pulling boat (1). The cyanobacterial bloom is transported to the drying system through the conveying system of the drying vessel. After drying by the drying system, the algal sludge is formed and stored in the storage system. After the drying vessel docks, it is moved to the shore for further processing.

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