Biological-physical coupling treatment device and method for diffuse algal blooms

Abstract

The application discloses a biological-physical coupling management equipment and method for diffuse algal blooms, and the equipment comprises a bottom plate, a water storage tank arranged on the bottom plate, a pretreatment assembly arranged in the water storage tank, and a belt type pressure filtration assembly arranged on the bottom plate; a grid is arranged in the water storage tank, and a collecting hopper is arranged at the bottom end of the grid; the pretreatment assembly is used for performing gravity dewatering treatment on algal particle aggregates falling from the collecting hopper; and the belt type pressure filtration assembly is used for performing extrusion dewatering treatment on the algal particle aggregates; the application utilizes the algal enrichment behavior of the copper-rust ring snail, i.e. the active feeding of free algal particles, the digestion system aggregation and the excretion into agglomerated aggregates, to realize the purpose of safe algal water separation; meanwhile, the belt type pressure filtration assembly is used for transporting the algal particle aggregates to the water surface along the oblique upward direction, and in this process, the algal particle aggregates are gradually separated from water, thereby realizing the purpose of biological-physical coupling management of diffuse algal blooms.

Description

Technical Field

[0001] This invention relates to the field of algal wastewater treatment technology, specifically to a biological-physical coupled treatment device and method for diffuse algal blooms. Background Technology

[0002] With the intensification of extreme climate change and human production activities, eutrophication and frequent cyanobacterial blooms in lakes and reservoirs remain serious global water environment problems. In recent years, Cylindrospermopsis, a highly adaptable and toxic algae-producing algae, has gradually invaded some eutrophic water bodies in my country, replacing other cyanobacteria as the dominant species during algal blooms, exacerbating the threat of algal blooms to human society. Cylindrospermopsis algae are small and uniformly dispersed in water bodies, making algal bloom control difficult. Single physical algae removal technologies (such as filtration, flotation, pressurization, and ultrasound) are not ideal for treating Cylindrospermopsis algae, and flocculation pretreatment is needed to improve the removal rate.

[0003] Existing flocculation filtration technologies are not suitable for controlling algal blooms in water sources because they involve the addition of chemicals. Secondly, the flocs formed by traditional flocculants such as polyaluminum chloride are loose and fragile, which has limited ability to improve filtration efficiency. At the same time, the chemicals are used only once and need to be added repeatedly to achieve a continuous flocculation effect, which is not only costly but also requires manpower and energy for material supply. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a biological-physical coupled treatment device and method for diffuse algal blooms.

[0005] The technical solution of the present invention is as follows: a biological-physical coupled treatment device for diffuse algal blooms, comprising a base plate, a water storage tank set on the base plate, a pretreatment component set at the bottom of the water storage tank, and a belt filter press component set on the base plate; the water storage tank is provided with a grid, a collection hopper is provided at the bottom of the grid, and a rectangular discharge pipe is provided at the bottom of the collection hopper;

[0006] The pretreatment assembly includes a dehydration tray located at the bottom of the water storage tank, a barrier screen plate located inside the dehydration tray, a cleaning push plate that is movably engaged inside the dehydration tray and abuts against the upper surface of the barrier screen plate, and a first electric push rod located on the outside of the dehydration tray and providing power to the cleaning push plate.

[0007] The belt filter press assembly includes an equipment box mounted on a base plate, a first rotating roller component, a second rotating roller component, and a squeeze roller component rotatably engaged inside the equipment box, a first filter press belt sleeved on the first rotating roller component and the squeeze roller component, a second filter press belt sleeved on the second rotating roller component and the squeeze roller component, a first drive motor mounted on the outer wall of the equipment box that provides power to the first rotating roller component, and a second drive motor that provides power to the second rotating roller component.

[0008] Furthermore, the collection hopper is permeated with water-permeable holes; inside the water storage tank and below the collection hopper, there is a lifting hopper adapted to the shape of the collection hopper; the lifting hopper is slidably engaged with the rectangular discharge pipe, and several lifting rods are distributed at equal intervals at the top of the lifting hopper, passing through the collection hopper and the water storage tank in sequence; an integrated plate connected to each lifting rod is installed above the water storage tank; an installation platform is installed at the top of the water storage tank; a second electric rod connected to the integrated plate is installed on the installation platform;

[0009] Explanation: Because *Laminaria rubra* is diffusely distributed in the water, it is difficult for *Laminaria rubra* in the area between the collection bucket and the grid to be consumed by *Bellamya rubra*. At this time, the second electric rod is used to push the integrated plate upward, and the lifting bucket is pulled closer to the collection bucket by the lifting rod. This allows the water in the area between the collection bucket and the grid to enter above the grid, where *Laminaria rubra* is again consumed by *Bellamya rubra*, which helps to improve the cleaning effect of *Laminaria rubra* in the water.

[0010] Furthermore, both sides of the collection hopper are slidably engaged with the inner wall of the water storage tank via sliding rods, and each sliding rod is fitted with a vibration spring located at the upper and lower ends of the collection hopper; each lifting rod is fitted with several rubber push plates.

[0011] Explanation: When the lifting rod moves on the collection hopper, the rubber push plate engages with the collection hopper, causing the collection hopper to vibrate up and down along the slide rod under the action of the vibration spring. This ensures that the algae particles on the collection hopper are completely discharged into the rectangular discharge pipe, preventing the algae particles from accumulating on the surface of the collection hopper and affecting the working efficiency of the equipment.

[0012] Furthermore, an opening and closing component is provided at the bottom of the rectangular discharge pipe; the opening component includes two opening and closing plates movably disposed at the bottom end of the opening and closing component, a linkage plate that is movably hinged to the two opening and closing plates and slidably engaged with the inner wall of the rectangular discharge pipe, and an operating rod that penetrates the water storage tank and is connected to the linkage plate; the two sides of the ends of the two opening and closing plates that are far apart from each other are slidably engaged with the inner wall of the rectangular discharge pipe; two linkage plates are provided, and the two linkage plates are respectively disposed on the two sides of the ends of the two opening and closing plates that are close to each other, and each linkage plate is provided with a first tooth groove; the operating rod is fitted with a drive gear that is respectively meshed with the two first tooth grooves one by one;

[0013] Instructions: When in use, the operating lever drives the drive gear to rotate. The meshing action of the drive gear and the first tooth groove causes the linkage plate to move upward along the inner wall of the rectangular discharge pipe, pulling the two opening and closing plates closer to each other. At this time, the algae particles inside the rectangular discharge pipe are discharged from the rectangular discharge pipe, preventing excessive water from the water tank from being discharged from the rectangular discharge pipe and affecting the growth environment of the copper rust ring.

[0014] Furthermore, a cleaning brush is rotatably engaged on the side of the cleaning push plate away from the first electric push rod, and small gears are provided at both ends of the cleaning brush; the inner wall of the dehydration disc is provided with second tooth grooves that mesh with the two small gears respectively.

[0015] Explanation: When the cleaning push plate moves inside the dehydration pan, it drives the cleaning brush to move. During the movement of the cleaning brush, the meshing action of the pinion and the second tooth groove generates rotation, which sweeps away the algae particle aggregates on the surface of the barrier screen, allowing all the algae particle aggregates on the barrier screen to enter the equipment box.

[0016] Furthermore, a scraper is rotatably engaged inside the equipment box and abuts against the outer wall of the second filter belt. Both ends of the scraper are provided with a rotating shaft that passes through the equipment box. Tensioning plates are provided on both rotating shafts. Tension springs are provided on the outer wall of the equipment box and are respectively connected to the two tensioning plates one by one.

[0017] Explanation: During the rotation of the second filter belt, the scraper removes the algae particles adhering to the second filter belt, ensuring that the second filter belt always operates at high efficiency; and the tension spring ensures that the scraper is always in close contact with the second filter belt, which helps to improve the scraper's effectiveness.

[0018] This invention also provides a biological-physical coupled control method for diffuse algal blooms, based on the aforementioned biological-physical coupled control device for diffuse algal blooms, comprising the following steps:

[0019] S1. Algal water containing *Laminaria rubra* is introduced into a storage tank, and *Bellamya rubra* is introduced into the tank. The *Bellamya rubra* feeds on and accumulates algal particles in the algal water above the grid. The algal particles excreted by the *Bellamya rubra* fall into the collection hopper under gravity and then enter the dehydration tray through a rectangular discharge pipe. The stocking density of *Bellamya rubra* is 300–500 individuals / m². 2 ;

[0020] S2. Under the action of gravity, the water in the algae particle aggregate inside the dewatering disc enters the bottom of the dewatering disc through the barrier screen and is eventually discharged from the dewatering disc. The first electric push rod pushes the cleaning push plate to move on the upper surface of the barrier screen, pushing the algae particle aggregate gathered on the barrier screen into the equipment box and causing the algae particle aggregate to fall onto the surface of the second filter belt.

[0021] S3. The first drive motor drives the first filter belt to rotate around the first rotating roller component and the extrusion roller component, and the second drive motor drives the second filter belt to rotate around the second rotating roller component and the extrusion roller component. When the algae aggregate passes through the extrusion roller component, it is dehydrated by the extrusion action of the second filter belt and the first filter belt. When the dehydrated algae aggregate passes through the top of the second rotating roller component, it separates from the second filter belt. The water squeezed out from the algae aggregate falls into the equipment box and is finally discharged from the equipment box.

[0022] Compared with the prior art, the beneficial effects of the present invention are reflected in the following aspects:

[0023] First, the device structure of the present invention is reasonably designed. It utilizes the algal enrichment behavior of the copper-rusted ring snail on the active feeding, digestive system aggregation, and excretion of free algal particles into aggregates to achieve the purpose of algae-water separation based on safety, and solves the problem of secondary water pollution caused by chemical treatment of diffuse algal blooms.

[0024] Secondly, when dehydrating algal particle aggregates, the equipment of the present invention first performs physical gravity dehydration, and then uses belt filter press components for mechanical dehydration, thereby achieving the purpose of biological-physical coupled treatment of diffuse algal blooms, making the equipment of the present invention have the advantages of high sustainability and safety.

[0025] Third, during operation, the equipment of the present invention uses the combined action of cleaning brushes and blowing frames to clean the barrier screen in real time, and uses scrapers and flushing nozzles to clean the second filter belt in real time; this ensures the reliability of the pretreatment components and belt filter components and improves the operational stability of the equipment. Attached Figure Description

[0026] Figure 1 This is a longitudinal sectional view of the device of the present invention;

[0027] Figure 2 This is a front view of the device of the present invention;

[0028] Figure 3 This is a right view of the device of the present invention;

[0029] Figure 4 This is the present invention. Figure 1 A magnified view of a portion of point A in the middle;

[0030] Figure 5 This is a schematic diagram of the pretreatment component of the present invention;

[0031] Figure 6 This is the present invention. Figure 2 A magnified view of a portion of point B in the middle;

[0032] Figure 7This is a schematic diagram showing the connection between the opening / closing component and the rectangular discharge pipe of the present invention;

[0033] Figure 8 This is a schematic diagram of the connection between the linkage plate and the opening / closing plate of the present invention;

[0034] Among them, 1-water storage tank, 10-grid screen, 11-collection hopper, 110-slide rod, 111-vibration spring, 112-rubber push plate, 12-rectangular discharge pipe, 13-lifting hopper, 130-lifting rod, 131-integrated plate, 14-installation platform, 15-second electric rod, 2-pretreatment component, 20-dehydration tray, 200-first sewage pipe, 201-transfer channel, 21-barrier screen, 22-cleaning push plate, 23-first electric push rod, 24-U-shaped push frame, 25-cleaning brush, 250-pinion gear, 251-second tooth groove, 26-blowing frame, 260-auxiliary push rod, 27-blowing fan, 3-belt filter press. Components, 30-Equipment box, 300-Material receiving hole, 301-Second sewage pipe, 31-First rotating roller component, 310-First guide roller, 32-Second rotating roller component, 320-Second guide roller, 33-Extrusion roller component, 330-Extrusion roller, 34-First filter press belt, 35-Second filter press belt, 36-First drive motor, 37-Second drive motor, 38-Scraper, 380-Rotating shaft, 381-Tension plate, 382-Tension spring, 39-Flushing nozzle, 390-Water pipe connector, 4-Collection box, 5-Opening and closing component, 50-Opening and closing plate, 51-Linkage plate, 510-First tooth groove, 52-Operating lever, 520-Drive gear. Detailed Implementation

[0035] Example 1

[0036] like Figure 1 The biological-physical coupled treatment device for diffuse algal blooms shown includes a base plate, a water storage tank 1 set on the base plate, a pretreatment component 2 set at the bottom of the water storage tank 1, and a belt filter press component 3 set on the base plate and connected to the water storage tank 1; the water storage tank 1 is provided with a mesh grid 10 with a pore size of 3mm, a collection hopper 11 is provided at the bottom end of the mesh grid 10, and a rectangular discharge pipe 12 is provided at the bottom end of the collection hopper 11.

[0037] like Figure 1 , 2As shown, the pretreatment component 2 includes a dehydration tray 20 disposed at the bottom of the water storage tank 1, a barrier mesh plate 21 disposed inside the dehydration tray 20, a cleaning push plate 22 movably engaged inside the dehydration tray 20 and abutting against the upper surface of the barrier mesh plate 21, and a first electric push rod 23 disposed on the outside of the dehydration tray 20 and providing power to the cleaning push plate 22; a first drain pipe 200 penetrating the water storage tank 1 is disposed on the outer wall of the dehydration tray 20, and a transfer channel 201 penetrating the water storage tank 1 is disposed on the side of the dehydration tray 20 away from the first electric push rod 23; a U-shaped push frame 24 is disposed on the cleaning push plate 22, which sequentially penetrates the dehydration tray 20 and the water storage tank 1; the first electric push rod 23 penetrates the water storage tank 1 and is connected to the inner wall of the U-shaped push frame 24;

[0038] like Figure 1 , 2 As shown in Figure 3, the belt filter press assembly 3 includes an equipment box 30 mounted on a base plate, a first rotating roller component 31, a second rotating roller component 32, and a squeeze roller component 33 rotatably engaged inside the equipment box 30, a first filter press belt 34 sleeved on the first rotating roller component 31 and the squeeze roller component 33, a second filter press belt 35 sleeved on the second rotating roller component 32 and the squeeze roller component 33, a first drive motor 36 mounted on the outer wall of the equipment box 30 and providing power to the first rotating roller component 31, and a second drive motor 37 providing power to the second rotating roller component 32; a receiving hole 300 is provided on the side of the equipment box 30 away from the water storage tank 1, and a second drain pipe 301 is provided at the lower end of the outer wall of the equipment box 30; a collection box 4 is provided on the base plate below the receiving hole 300; the first rotating roller component 31 is composed of three first guide rollers 310, which are triangularly distributed inside the equipment box 30. On one side of the section, the first drive motor 36 provides power to one of the first guide rollers 310; the second rotating roller component 32 is composed of three second guide rollers 320, which are triangularly distributed inside the equipment box 30 on the other side, and the second drive motor 37 provides power to one of the second guide rollers 320; five sets of extrusion roller components 33 are provided, and each set of extrusion roller components 33 is evenly distributed between the first rotating roller component 31 and the second rotating roller component 32, and the height of each set of extrusion roller components 33 increases sequentially; each set of extrusion roller components 33 is composed of two extrusion rollers 330; the first filter belt 34 and the second filter belt 35 are both annular structures, the first filter belt 34 is sleeved on the outside of each first guide roller 310 and extrusion roller 330, and the second filter belt 35 is sleeved on the outside of each second guide roller 320 and extrusion roller 330, and the second filter belt 35 abuts against the transfer channel 201.

[0039] Example 2

[0040] This embodiment describes a biological-physical coupled control method for diffuse algal blooms, based on the biological-physical coupled control device for diffuse algal blooms in Embodiment 1, including the following steps:

[0041] S1. Algal water containing *Laminaria rubra* is introduced into the storage tank 1, and *Bellamya rubra* is introduced into the storage tank 1. *Bellamya rubra* feeds on and accumulates algal particles in the algal water above the grid 10. The algal particles excreted by *Bellamya rubra* fall into the collection hopper 11 under gravity and enter the dehydration tray 20 through the rectangular discharge pipe 12. The stocking density of *Bellamya rubra* is 300 individuals / m². 2 ;

[0042] S2. Under the action of gravity, the water in the algae particle aggregate inside the dehydration tray 20 enters the bottom of the dehydration tray 20 through the barrier screen 21 and is finally discharged from the dehydration tray 20 through the first drain pipe 200. The first electric push rod 23 pulls the U-shaped push frame 24 to move along the inner wall of the water storage tank 1. The U-shaped push frame 24 pushes the cleaning push plate 22 to move on the upper surface of the barrier screen 21, pushing the algae particle aggregate on the barrier screen 21 into the equipment box 30 through the transfer channel 201, and causing the algae particle aggregate to fall onto the surface of the second filter belt 35.

[0043] S3. The first drive motor 36 drives the first filter belt 34 to rotate around the first guide rollers 310 and the extrusion rollers 330. The second drive motor 37 drives the second filter belt 35 to rotate around the second guide rollers 320 and the extrusion rollers 330. When the algae aggregate passes through the extrusion rollers 330, it is dehydrated by the extrusion action of the second filter belt 35 and the first filter belt 34. When the dehydrated algae aggregate passes the top of the second rotating roller component 32, it separates from the second filter belt 35 and falls into the collection box 4 through the receiving hole 300. The water squeezed out of the algae aggregate falls into the equipment box 30 and is finally discharged from the equipment box 30 through the second drain pipe 301.

[0044] Example 3

[0045] This embodiment describes a biological-physical coupled control method for diffuse algal blooms, based on the biological-physical coupled control device for diffuse algal blooms in Embodiment 1, but differing from Embodiment 2 in that:

[0046] In step S1, the stocking density of the copper-rusted ring-shaped snail is 500 snails / m². 2 .

[0047] Example 4

[0048] The difference between this embodiment and Embodiment 1 is that:

[0049] like Figure 1As shown, a water-permeable hole is provided through the collection hopper 11; a lifting hopper 13 adapted to the shape of the collection hopper 11 is provided inside the water storage tank 1 and below the collection hopper 11; the lifting hopper 13 is slidably engaged with the rectangular discharge pipe 12, and four lifting rods 130 are equidistantly distributed at the top of the lifting hopper 13, which pass through the collection hopper 11 and the water storage tank 1 in sequence; an integrated plate 131 connected to each lifting rod 130 is provided above the water storage tank 1; an installation platform 14 is provided at the top of the water storage tank 1; a second electric rod 15 connected to the integrated plate 131 is provided on the installation platform 14.

[0050] Example 5

[0051] This embodiment describes a biological-physical coupled control method for diffuse algal blooms, based on the biological-physical coupled control device for diffuse algal blooms in Embodiment 4, which differs from Embodiment 2 in that:

[0052] After step S1 is completed, the second electric rod 15 is used to push the integrated plate 131 upward, and the lifting rod 130 is used to pull the lifting bucket 13 closer to the collection bucket 11, so that the water in the area between the collection bucket 11 and the grid 10 enters above the grid 10, and the Algae rasalis in the water is fed again by the copper rust ring snail.

[0053] Example 6

[0054] The difference between this embodiment and embodiment 4 is that:

[0055] like Figure 4 As shown, both sides of the collection hopper 11 are slidably engaged with the inner wall of the water storage tank 1 via sliding rods 110. Each sliding rod 110 is fitted with a vibration spring 111 located at the upper and lower ends of the collection hopper 11; each lifting rod 130 is fitted with 4 rubber push plates 112.

[0056] Example 7

[0057] This embodiment describes a biological-physical coupled control method for diffuse algal blooms, based on the biological-physical coupled control device for diffuse algal blooms in Embodiment 6, which differs from Embodiment 5 in that:

[0058] In step S1, when the lifting rod 130 moves on the collection hopper 11, the rubber push plate 112 and the collection hopper 11 are engaged, causing the collection hopper 11 to vibrate up and down along the slide rod 110 under the action of the vibration spring 111, so that the algae particles on the collection hopper 11 completely enter the rectangular discharge pipe 12.

[0059] Example 8

[0060] The difference between this embodiment and embodiment 6 is that:

[0061] like Figure 1 , 2 As shown in Figure 5, a blower 26 is provided inside the dehydration tray 20 and below the barrier screen 21. The blower 26 has an air hole on the side near the barrier screen 21. A blower 27 connected to the blower 26 via a conduit is provided on the bottom plate. An auxiliary push rod 260 is provided inside the U-shaped pusher 24, passing through the water tank 1 and the dehydration tray 20 and connected to the blower 26. A cleaning brush 25 is rotatably engaged on the side of the cleaning push plate 22 away from the first electric push rod 23. Both ends of the cleaning brush 25 are provided with small gears 250. The inner wall of the dehydration tray 20 is provided with second tooth grooves 251 that mesh with the two small gears 250 respectively.

[0062] Example 9

[0063] This embodiment describes a biological-physical coupled control method for diffuse algal blooms, based on the biological-physical coupled control device for diffuse algal blooms in Embodiment 8, which differs from Embodiment 7 in that:

[0064] In step S2, during the movement of the U-shaped pusher 24, the auxiliary push rod 260 pushes the blowing frame 26 to move along the bottom surface of the barrier mesh plate 21. Under the action of the blower 27, outside air is blown through the air holes onto the barrier mesh plate 21 to remove the algae particle aggregates blocking the gaps in the barrier mesh plate 21. At the same time, the cleaning push plate 22 drives the cleaning brush 25 to move. During the movement of the cleaning brush 25, the meshing action of the pinion 250 and the second tooth groove 251 generates rotation, which cleans the algae particle aggregates on the surface of the barrier mesh plate 21.

[0065] Example 10

[0066] The difference between this embodiment and embodiment 8 is that:

[0067] like Figure 7 , 8 As shown, an opening and closing component 5 is provided at the bottom of the rectangular discharge pipe 12; the opening component 5 includes two opening and closing plates 50 movably disposed at the bottom end of the opening and closing component 5, a linkage plate 51 that is movably hinged to the two opening and closing plates 50 and slidably engaged with the inner wall of the rectangular discharge pipe 12, and an operating rod 52 that penetrates the water storage tank 1 and is connected to the linkage plate 51; the two sides of the ends of the two opening and closing plates 50 that are far apart from each other are slidably engaged with the inner wall of the rectangular discharge pipe 12; there are two linkage plates 51, which are respectively disposed on the two sides of the ends of the two opening and closing plates 50 that are close to each other, and each linkage plate 51 is provided with a first tooth groove 510; the operating rod 52 is sleeved with a drive gear 520 that is respectively meshed with the two first tooth grooves 510.

[0068] Example 11

[0069] This embodiment describes a biological-physical coupled control method for diffuse algal blooms, based on the biological-physical coupled control device for diffuse algal blooms in Embodiment 10, which differs from Embodiment 8 in that:

[0070] In step S1, after the algae particles discharged by the copper rust ring snail gather and fall into the collection hopper 11, the operating rod 52 drives the drive gear 520 to rotate. The meshing action of the drive gear 520 and the first tooth groove 510 causes the linkage plate 51 to move upward along the inner wall of the rectangular discharge pipe 12 and pulls the two opening and closing plates 50 closer to each other. At this time, the algae particle aggregate inside the rectangular discharge pipe 12 is discharged from the rectangular discharge pipe 12.

[0071] Example 12

[0072] The difference between this embodiment and embodiment 10 is that:

[0073] like Figure 1 , 2 As shown in Figure 6, a scraper 38 is rotatably engaged inside the equipment box 30, abutting against the outer wall of the second filter press belt 35. Both ends of the scraper 38 are provided with a rotating shaft 380 that passes through the equipment box 30. Tensioning plates 381 are provided on both rotating shafts 380. Tension springs 382 are provided on the outer wall of the equipment box 30, which are respectively connected to the two tensioning plates 381. A rinsing nozzle 39 located inside the second filter press belt 35 is engaged inside the equipment box 30. A water pipe connector 390 connected to the rinsing nozzle 39 is provided on the outer wall of the equipment box 30.

[0074] Example 13

[0075] This embodiment describes a biological-physical coupled control method for diffuse algal blooms, based on the biological-physical coupled control device for diffuse algal blooms in Embodiment 12, which differs from Embodiment 11 in that:

[0076] In step S3, during the rotation of the second filter press belt 35, the scraper 38 is used to scrape off the algae particle aggregates adhering to the second filter press belt 35; at the same time, the water pipe connector 390 is connected to an external water source, and the external water source is sprayed onto the second filter press belt 35 through the flushing nozzle 39 to flush the algae particle aggregates adhering to the second filter press belt 35.

[0077] It should be noted that the second electric rod 15, the first electric push rod 23, the blower 27, the first drive motor 36, the second drive motor 37, and the rinsing nozzle 39 used in this invention all adopt existing technologies and are not specifically limited here. Appropriate products can be selected according to actual needs.

Claims

1. A biological-physical coupled control device for diffuse algal blooms, characterized in that, It includes a base plate, a water storage tank (1) disposed on the base plate, a pretreatment component (2) disposed at the bottom of the water storage tank (1), and a belt filter press component (3) disposed on the base plate; a grid (10) is disposed inside the water storage tank (1), a collection hopper (11) is disposed at the bottom of the grid (10), and a rectangular discharge pipe (12) is disposed at the bottom of the collection hopper (11). The pretreatment component (2) includes a dehydration tray (20) disposed at the bottom of the water storage tank (1), a barrier mesh plate (21) disposed inside the dehydration tray (20), a cleaning push plate (22) movably engaged inside the dehydration tray (20) and abutting against the upper surface of the barrier mesh plate (21), and a first electric push rod (23) disposed on the outside of the dehydration tray (20) and providing power to the cleaning push plate (22). The belt filter press assembly (3) includes an equipment box (30) mounted on a base plate, a first rotating roller component (31), a second rotating roller component (32) and a squeeze roller component (33) rotatably connected inside the equipment box (30), a first filter press belt (34) sleeved on the first rotating roller component (31) and the squeeze roller component (33), a second filter press belt (35) sleeved on the second rotating roller component (32) and the squeeze roller component (33), a first drive motor (36) mounted on the outer wall of the equipment box (30) and providing power to the first rotating roller component (31), and a second drive motor (37) providing power to the second rotating roller component (32). A water-permeable hole is provided through the collection hopper (11); a lifting hopper (13) adapted to the shape of the collection hopper (11) is provided inside the water storage tank (1) and below the collection hopper (11); the lifting hopper (13) is slidably engaged with the rectangular discharge pipe (12), and several lifting rods (130) are distributed equidistantly at the top of the lifting hopper (13) and pass through the collection hopper (11) and the water storage tank (1) in sequence; an integrated plate (131) connected to each of the lifting rods (130) is provided above the water storage tank (1); an installation platform (14) is provided at the top of the water storage tank (1); a second electric rod (15) connected to the integrated plate (131) is provided on the installation platform (14). Both sides of the collection hopper (11) are slidably engaged with the inner wall of the water storage tank (1) via slide rods (110). Each slide rod (110) is fitted with a vibration spring (111) located at the upper and lower ends of the collection hopper (11); each lifting rod (130) is fitted with several rubber push plates (112). The rectangular discharge pipe (12) is provided with an opening and closing component (5) at its bottom. The opening and closing component (5) includes two opening and closing plates (50) movably disposed at the bottom end of the discharge pipe (12), a linkage plate (51) movably hinged to the two opening and closing plates (50) and slidably engaged with the inner wall of the rectangular discharge pipe (12), and an operating rod (52) penetrating the water storage tank (1) and connected to the linkage plate (51). The two sides of the ends of the two opening and closing plates (50) that are far apart from each other are slidably engaged with the inner wall of the rectangular discharge pipe (12). There are two linkage plates (51), which are respectively disposed on the two sides of the ends of the two opening and closing plates (50) that are close to each other. Each linkage plate (51) is provided with a first tooth groove (510). The operating rod (52) is sleeved with a drive gear (520) that meshes with the two first tooth grooves (510) respectively.

2. The biological-physical coupled treatment device for diffuse algal blooms according to claim 1, characterized in that, The cleaning push plate (22) is rotatably engaged with a cleaning brush (25) on the side away from the first electric push rod (23). Both ends of the cleaning brush (25) are provided with small gears (250). The inner wall of the dehydration disc (20) is provided with second tooth grooves (251) that mesh with the two small gears (250) respectively.

3. The biological-physical coupled treatment device for diffuse algal blooms according to claim 1, characterized in that, The equipment box (30) is rotatably engaged with a scraper (38) that abuts against the outer wall of the second filter belt (35). Both ends of the scraper (38) are provided with a rotating shaft (380) that passes through the equipment box (30). Tensioning plates (381) are provided on both rotating shafts (380). Tension springs (382) are provided on the outer wall of the equipment box (30) and are respectively connected to the two tensioning plates (381).

4. A biological-physical coupled control method for diffuse algal blooms, based on the biological-physical coupled control equipment for diffuse algal blooms as described in any one of claims 1-3, characterized in that, Includes the following steps: S1. Algal water containing *Laminaria rubra* is introduced into the water storage tank (1), and *Bellamya rubra* is introduced into the water storage tank (1). *Bellamya rubra* feeds on and enriches the algal particles in the algal water above the grid (10). The algal particles excreted by *Bellamya rubra* fall into the collection hopper (11) under gravity and enter the dehydration tray (20) through the rectangular discharge pipe (12). The density of *Bellamya rubra* is 300-500 per m³. 2 ; S2. Under the action of gravity, the water in the algae particle aggregate inside the dehydration tray (20) enters the bottom of the dehydration tray (20) through the barrier screen (21) and is finally discharged from the dehydration tray (20). The cleaning push plate (22) is pushed by the first electric push rod (23) to move on the upper surface of the barrier screen (21), pushing the algae particle aggregate on the barrier screen (21) into the equipment box (30) and causing the algae particle aggregate to fall onto the surface of the second filter belt (35). S3. The first drive motor (36) drives the first filter belt (34) to rotate around the first rotating roller component (31) and the extrusion roller component (33). The second drive motor (37) drives the second filter belt (35) to rotate around the second rotating roller component (32) and the extrusion roller component (33). When the algae aggregate passes through the extrusion roller component (33), it is dehydrated by the extrusion action of the second filter belt (35) and the first filter belt (34). When the dehydrated algae aggregate passes through the top of the second rotating roller component (32), it separates from the second filter belt (35). The water squeezed out of the algae aggregate falls into the equipment box (30) and is finally discharged from the equipment box (30).

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