Dissolved air flotation algae removal and residue suction system

Abstract

The invention discloses a dissolved air flotation algae removal and residue suction system which comprises a filter tank, a dissolved air flotation device for enabling impurities to float to the water surface through air and a residue suction device for collecting floating objects on the water surface. The dissolved air flotation device comprises a dissolved air tank used for mixing water with compressed air to form dissolved air water; the air compressor is used for pressurizing air and then conveying the pressurized air to the dissolved air tank; the reflux pump is used for conveying part of settled water into the dissolved air tank; the dissolved air releaser is communicated with the dissolved air tank, is arranged in the filter tank and is used for diffusing the dissolved air water in the filter tank; the scum collector is arranged in the filter tank, and a scum suction port of the scum collector is positioned below the liquid level; and the vacuum suction device enables the scum collector to form negative pressure so as to absorb the scum on the liquid level of the filter tank, and conveys the scum to the sludge discharge tank. The device has the effect of stabilizing the water quality before filtration.

Description

Technical Field

[0001] The invention relates to the field of water treatment equipment, in particular to a dissolved air flotation algae removal and slag absorption system. Background Art

[0002] In the water treatment industry, especially in urban water supply systems, sedimentation tanks are an important part of the water treatment process, and their operating efficiency directly affects the effect of subsequent treatment processes and the final effluent quality. However, some water plants often face the problem of "flocculation" in the sedimentation tank during actual operation. This phenomenon refers to the fact that during the sedimentation process, the flocs (i.e., flocs formed by the combination of coagulants such as aluminum salts or iron salts and suspended matter in the water) that should have settled in the sedimentation tank failed to settle effectively due to water flow disturbances, poor hydraulic conditions, or insufficient coagulation effects, and entered the subsequent filter tank with the water flow. This not only increases the surface load of the filter tank, causing the filter layer to quickly clog, but also leads to the accumulation of impurities in the tank, further increasing the head loss of the filter tank, significantly reducing the filtration efficiency, and forcing the water plant to increase the frequency of backwashing to maintain normal operation, thereby increasing operating costs and possibly shortening the service life of the filter media.

[0003] In addition, as water pollution becomes increasingly complex, the content of algae and specific organic pollutants such as 2-methylisoborneol (2-MIB) in the raw water of water plants is generally high. The massive reproduction of algae not only affects the sensory properties of water, but may also produce harmful substances, threatening the safety of drinking water. Traditional water treatment processes, such as coagulation, sedimentation, filtration and disinfection, have limited effects on the efficient removal of algae and the reduction of trace organic pollutants such as 2-MIB, making it difficult to meet the increasingly stringent drinking water quality standards.

[0004] The existing technology faces the problem of low removal efficiency of alum flocs, algae and 2-MIB in the sedimentation tank during the water treatment process. It is urgent to develop new technologies or optimize existing processes to improve the overall water treatment effect and ensure the safety and stability of the effluent water quality. Summary of the invention

[0005] In order to improve the water treatment effect and the stability of the effluent water quality, the present application provides a dissolved air flotation algae removal and slag suction system.

[0006] A dissolved air flotation algae removal and slag suction system, comprising a filter tank, a dissolved air flotation device for floating impurities to the water surface through air, and a slag suction device for collecting floating objects on the water surface;

[0007] The dissolved air flotation device comprises:

[0008] A dissolved air tank is used to mix water with compressed air to form dissolved air water;

[0009] The air compressor pressurizes the air and delivers it to the air dissolving tank;

[0010] A return pump to transfer part of the settled water to the air dissolving tank; and

[0011] A dissolved air releaser is connected to the dissolved air tank and arranged in the filter tank, and is used to diffuse dissolved air water in the filter tank;

[0012] The slag suction device comprises:

[0013] A scum collector is arranged in the filter tank and its scum suction port is located below the liquid surface;

[0014] The vacuum suction device creates negative pressure in the scum collector to absorb the scum on the filter tank surface and transports the scum to the sludge discharge tank.

[0015] Through the above technical solution, the air compressor pressurizes the air into compressed air and injects it into the air dissolving tank. The air is cut, dispersed and dissolved by the air dissolving tank, and then the air is instantly decompressed through the air releaser. The supersaturated gas dissolved in the water is suddenly released to produce a large number of fine bubbles, so that the algae, alum flowers and some fine particles in the water after sinking are combined with the fine bubbles and float to the water surface. The floating slag is sucked into the mud discharge pool through the adaptive negative pressure slag suction system. It can remove light organic matter and algae in the water and reduce the disinfection byproduct 2-MIB; as a post-sedimentation (pre-filtration) process, it can further stabilize the water quality before filtration, extend the filter tank backwashing cycle, and ensure the water quality after filtration.

[0016] Preferably, there are a plurality of dissolved air releasers which are all arranged on both sides of the filter tank, and the scum collector is arranged at a middle position at one end of the filter tank.

[0017] Through the above technical solution, the dissolved air releasers are evenly arranged on both sides of the filter tank, which can ensure that the dissolved air bubbles are evenly distributed in the entire flotation tank contact area. This helps to increase the contact opportunities between the bubbles and the algae and suspended matter in the water, and improve the efficiency of algae removal and slag absorption. The uniform arrangement of the dissolved air releasers can also ensure the stability of the dissolved air pressure, so that the air is forced to dissolve in the water under pressure, and forms fine bubbles when released, which enhances the adhesion and floating ability of the bubbles. The scum collector is arranged in the middle of one end of the filter tank, which can conveniently collect the scum in a centralized manner.

[0018] Preferably, the slag suction device also includes a surface sweeping structure for blowing the slag to a slag collector; the surface sweeping structure includes a slag blowing nozzle, the slag blowing nozzle is installed at one end of the filter tank away from the slag collector and on both sides of the filter tank, the slag blowing nozzle is located above the liquid level, the slag blowing nozzle is facing the direction of the slag collector, and the slag blowing nozzle is connected to a blowing pump through a pipeline.

[0019] Through the above technical solution, the slag blowing nozzle can directionally blow the slag to the slag collector. Through the action of the blowing pump, the slag blowing nozzle can generate a certain blowing force to quickly blow the slag to the slag collector. This greatly improves the collection speed of slag and shortens the processing cycle. It effectively reduces the accumulation of slag on the surface of the filter tank, which helps to keep the filter tank clean and unobstructed, and prevents the slag from clogging the system or affecting the treatment effect. In addition, since the slag is collected and processed in a timely and effective manner, the maintenance cost of the system is also reduced accordingly. Equipment failures and downtime caused by slag accumulation are reduced, and the service life of the system is extended. In addition, while blowing the slag, the slag blowing nozzle can also blow away the bubbles attached to the algae, making it easier for the algae to float to the water surface and be collected by the bubbles.

[0020] Preferably, the slag collector includes a mounting frame fixedly connected to the side wall of the filter tank and a horizontally arranged slag suction groove, the slag suction port is opened at the bottom of the slag suction groove, the mounting frame is threadedly connected with two screws, the lower end of the screw is rotatably connected to the slag suction groove, and the top end of the screw is coaxially fixedly connected with a handwheel.

[0021] Through the above technical solution, by rotating the hand wheel, the screw can be driven to move up and down, thereby adjusting the height of the slag suction groove. This design enables the slag collector to flexibly adjust the collection position according to the actual operation conditions and the accumulation of slag, ensuring that the slag can be effectively collected.

[0022] Preferably, the slag collector includes a mounting frame fixedly connected to the side wall of the filter tank and a horizontally arranged slag suction trough, the slag suction port is opened at the bottom of the slag suction trough, the slag suction trough is slidably connected to the mounting frame, and the slag suction trough is connected to a float, and the float is used to make the slag suction trough float on the water surface.

[0023] Through the above technical solution, the design of the scum collector with a float ball to control the height of the scum suction trough has shown significant advantages in the aerosol flotation algae removal scum suction system. The float ball makes the scum suction trough automatically float on the water surface and float up and down with the water level fluctuation, without manual adjustment, simplifying the operation process and reducing maintenance costs. At the same time, this design ensures that the scum suction trough is always maintained at an appropriate height, and can continuously and effectively collect scum, reducing the situation of missed collection and excessive collection, and improving the processing efficiency and system stability.

[0024] Preferably, the mounting frame is provided with a wave-breaking shell, which is a quadrilateral shell with openings at both ends, the upper end of the wave-breaking shell being higher than the liquid level, and the lower end thereof being submerged below the water level and not in contact with the bottom of the filter tank; the slag suction groove is located on the side of the wave-breaking shell facing the slag blowing nozzle, a support rod is fixedly connected to the bottom of the slag suction groove, the support rod is connected to a cable, the cable is connected to a float, and the wave-breaking shell is provided with a through hole for the cable to pass through.

[0025] Through the above technical solution, the design of the wave-breaking shell can effectively reduce the impact of water flow fluctuations on the slag suction trough and the float, making the slag suction trough and the float work more stably and improving the overall stability of the system.

[0026] Preferably, a first pulley is installed at one end of the support rod, and the float is provided with a second pulley. One end of the cable is fixedly connected to the mounting frame, and the other end is passed around the second pulley, through the through hole, around the first pulley and finally fixedly connected to the mounting frame, wherein the height of the second pulley is greater than the height of the first pulley.

[0027] Through the above technical solution, the float is affected by the height of the filter tank liquid level and rises and falls, and the slag suction trough is driven to rise and fall by the action of the cable and the pulley, and the rising and falling distance is the same as that of the float.

[0028] Preferably, the side of the wave-breaking shell facing the slag blowing nozzle is bent into an inwardly concave structural groove, and the through hole is a rectangular through hole and is opened on the side wall of the structural groove.

[0029] Through the above technical solution, the through hole is designed on the side wall of the structural groove to facilitate the passage of the cable, reduce the friction between the cable and the wave breakers, and improve the smoothness of the slag collector.

[0030] Preferably, the support rod is installed with a first roller, the mounting frame is provided with a first T-shaped slot, and the first roller is placed in the first T-shaped slot.

[0031] Through the above technical solution, the stability of the slag suction trough activity is improved.

[0032] Preferably, the second pulley is installed with a connecting block, the connecting block is installed with a second roller, the mounting frame is provided with a second T-shaped slot, and the second roller is arranged in the second T-shaped slot.

[0033] Through the above technical solution, the stability of the movement of the float is improved, and the stability of the slag suction trough activity is further improved.

[0034] In summary:

[0035] 1. The air compressor pressurizes the air into compressed air and injects it into the air dissolving tank. The air is cut, dispersed and dissolved by the air dissolving tank, and then the air is instantly decompressed by the air releaser. The supersaturated gas dissolved in the water is suddenly released to produce a large number of fine bubbles, so that the algae, alum flowers and some fine particles in the water after sinking are combined with the fine bubbles and float to the surface of the water. The floating scum is sucked into the mud discharge pool through the adaptive negative pressure slag suction system. It can remove light organic matter and algae in the water and reduce the disinfection byproduct 2-MIB; as a post-sedimentation (pre-filtration) process, it can further stabilize the water quality before filtration, extend the filter tank backwashing cycle, and ensure the water quality after filtration.

[0036] 2. The stability of the slag collector has been significantly improved by adding a wave-breaking shell. As a quadrilateral shell with openings at the upper and lower ends, the wave-breaking shell can effectively reduce the impact of water flow fluctuations on the slag suction trough and float, making the equipment work more stably.

[0037] 3. Adding pulleys to the support rods and floats further improves the adjustment efficiency and stability of the scum collector. The use of pulleys allows the cable to move more smoothly when adjusting the height of the scum suction tank, reducing friction and resistance. At the same time, by changing the direction of the cable through the pulley, the lifting and lowering of the scum suction tank can be more effectively controlled, so that it can maintain a stable posture at different water levels. This design not only optimizes space utilization, but also facilitates the installation and maintenance of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of Example 1 of the present application for showing the overall layout.

[0039] Figure 2 It is a schematic diagram of Example 1 of the present application for demonstrating the surface sweeping and cleaning structure.

[0040] Figure 3 It is a schematic diagram of the structure of the slag collector used to illustrate Example 1 of the present application.

[0041] Figure 4 It is a schematic diagram of the structure of the slag collector used to illustrate Example 2 of the present application.

[0042] Figure 5 This is a cross-sectional view of Example 2 of the present application for illustrating a slag collector.

[0043] Figure 6 yes Figure 5 Enlarged view of part A.

[0044] Description of reference numerals:

[0045] 200, dissolved air flotation device; 240, dissolved air releaser; 300, slag suction device; 310, slag collector; 311, mounting frame; 312, slag suction groove; 3121, support rod; 3122, slag suction port; 3123, screw; 3124, hand wheel; 313, wave-breaking shell; 3131, through hole; 3132, structural groove; 314, cable; 315, first roller; 316, second roller; 317, first pulley; 318, second pulley; 319, float; 3191, connecting block; 320, vacuum suction device; 330, surface sweeping structure; 331, slag blowing nozzle; 332, purge pump. DETAILED DESCRIPTION

[0046] Embodiment 1:

[0047] A dissolved air flotation algae removal and slag suction system, referring to Figure 1 , and is arranged in the filter tank. The filter tank is a V-shaped filter tank, located on both sides of the filter tank, and has a water distribution channel for evenly distributing the incoming water. A sand layer for filtration is arranged inside the filter tank, and the dissolved air flotation algae removal and slag suction system is located in the filter tank, utilizing the water level space above the sand layer of the filter tank, and does not occupy additional space. In this embodiment, in order to provide benefits, the dissolved air flotation algae removal and slag suction system is configured in multiple filter tanks at the same time, and the multiple filter tanks are arranged side by side.

[0048] The system includes:

[0049] The dissolved air flotation device 200 is used to introduce dissolved air water into the filter tank, so that a large number of fine bubbles are generated in the filter tank, and the algae, alum flowers and some fine particles in the sinking water are combined with the fine bubbles and float to the water surface;

[0050] The residue suction device 300 is used to absorb algae, alum flowers and some fine particles floating on the water surface.

[0051] Remove algae, alum flowers and some fine particles on the water surface as a post-sedimentation (pre-filtration) process to further stabilize the water quality before filtration, extend the filter tank backwash cycle, and ensure the water quality after filtration.

[0052] The dissolved air flotation device 200 comprises:

[0053] The gas dissolving tank sends compressed air into the tank, and the gas is divided into small bubbles through the gas-liquid contact structure in the tank. These small bubbles diffuse rapidly in the liquid and fully contact the liquid, so that the gas is dissolved in the liquid to form dissolved gas water;

[0054] An air compressor is connected to the air dissolving tank, pressurizes the air and delivers it to the air dissolving tank, so as to provide compressed air for the air dissolving tank;

[0055] A reflux pump, whose water outlet is connected to the dissolved air tank, is used to transport part of the post-settling water to the dissolved air tank to form dissolved air water; and

[0056] The dissolved air releaser 240 is connected to the dissolved air tank and arranged in the filter tank, and is used to diffuse the dissolved air water in the filter tank.

[0057] The air compressor pressurizes the air into compressed air and injects it into the air dissolving tank, which cuts, disperses and dissolves the air, and then diffuses it into the filter tank through the air dissolving releaser 240. The pressure dissolved air water passes through the air dissolving releaser 240 to reduce the pressure and dissipate the energy, thereby releasing a large number of fine bubbles, so that the algae, alum flowers and some fine particles in the sinking water are combined with the fine bubbles and float to the water surface.

[0058] A plurality of dissolved air releasers 240 are arranged in the water distribution channels on both sides of each filter tank, which can ensure that the dissolved air bubbles are evenly distributed in the entire flotation tank contact area. This helps to increase the contact opportunities between the bubbles and the algae and suspended matter in the water, and improve the efficiency of algae removal and slag absorption. In this embodiment, 6 dissolved air releasers 240 are arranged in each filter tank, and are all located at one end of the length direction of the filter tank and evenly distributed. The uniform arrangement of the dissolved air releasers 240 can also ensure the stability of the dissolved air pressure, so that the air is forced to dissolve in the water under pressure, and forms fine bubbles when released, which enhances the adhesion and floating ability of the bubbles.

[0059] Reference Figure 2 , the slag suction device 300 comprises:

[0060] The scum collector 310 is disposed in the filter tank and its scum suction port 3122 is located below the liquid surface. The scum collector 310 is located in the middle of the filter tank away from the dissolved air releaser 240.

[0061] The vacuum suction device 320 creates negative pressure in the scum collector 310 to absorb the scum on the liquid surface of the filter tank and transport the scum to the sludge discharge tank.

[0062] The vacuum suction device 320 includes a water pump and a water ejector. The water inlet of the water pump is connected to the drainage pool, the water outlet is connected to the pressure water inlet of the water ejector, and the outlet is connected to the sewage pool. The suction port of the water ejector is connected to the slag suction port 3122 of the scum collector 310 through a negative pressure pipe. When the high-pressure water generated by the water pump is ejected to the throat through the nozzle in the water ejector, the high-speed flowing water will generate a pressure difference with the surrounding fluid, forming a negative pressure in the negative pressure pipe. Algae, alum flowers and some fine particles floating on the liquid surface in the filter tank are absorbed by the scum collector 310 and transported to the mud discharge pool.

[0063] Reference Figure 2 The scum collector 310 includes a mounting frame 311 fixedly connected to the side wall of the filter tank and a horizontally arranged scum suction groove 312. The scum suction groove 312 is rectangular, the upper surface is horizontally arranged, and the bottom of the groove is inclined to one side. The scum suction port 3122 is opened at the inclined lower end of the bottom of the scum suction groove 312. The mounting frame 311 is threadedly connected with two screws 3123, the lower end of the screw 3123 is rotatably connected to the scum suction groove 312, and the top of the screw 3123 is coaxially fixedly connected with a hand wheel 3124. By rotating the hand wheel 3124, the screw 3123 can be driven to move up and down, and then the height of the scum suction groove 312 can be adjusted, so that the upper surface of the scum suction groove 312 is slightly lower than the liquid surface of the filter tank, and the algae, alum flowers and some fine particles floating on the liquid surface flow into the scum suction groove 312 and flow to the scum suction port 3122, so as to be sucked away by the vacuum suction device 320 and transported to the sewage tank.

[0064] Reference Figure 3To further improve the slag suction efficiency, the slag suction device 300 further includes a surface sweeping structure 330 for blowing the slag to the slag collector 310 .

[0065] The surface sweeping and washing structure 330 includes a slag blowing nozzle 331, two of which are installed at one end of the filter tank away from the slag collector 310, and two of which are installed on both sides of the filter tank. The slag blowing nozzle 331 is located above the liquid level, and faces the direction of the slag collector 310. The slag blowing nozzle 331 sprays in a fan shape and is inclined to the liquid surface. The slag blowing nozzle 331 is connected to a purge pump 332 through a pipeline. The slag blowing nozzle 331 can blow the slag to the slag collector 310 in a directionally manner. Through the action of the purge pump 332, the slag blowing nozzle 331 can generate a certain purge force to quickly blow the slag to the slag collector 310. This greatly improves the collection speed of the slag and shortens the processing cycle. The accumulation of slag on the surface of the filter tank is effectively reduced, which helps to keep the filter tank clean and unobstructed, and prevents the slag from clogging the system or affecting the processing effect. In addition, since the slag is collected and processed in a timely and effective manner, the maintenance cost of the system is also reduced accordingly. The equipment failure and downtime caused by the accumulation of scum are reduced, and the service life of the system is extended. In addition, the scum blowing nozzle 331 can also blow away the bubbles attached to the algae while blowing away the scum, so that the algae can be more easily driven by the bubbles to float to the water surface and be collected.

[0066] The working principle of the dissolved air flotation algae removal and slag suction system disclosed in this embodiment is as follows: the air compressor pressurizes the air into compressed air and injects it into the dissolved air tank, which cuts, disperses and dissolves the air, and then instantly reduces the pressure through the air releaser, so that the supersaturated gas dissolved in the water is suddenly released to produce a large number of fine bubbles, so that the algae, alum flowers and some fine particles in the water after sinking are combined with the fine bubbles and float to the water surface. The slag blowing nozzle 331 can directionally blow the slag to the slag collector 310. Through the action of the purge pump 332, the slag blowing nozzle 331 can generate a certain purge force to quickly blow the slag to the slag collector 310. The slag is sucked into the mud discharge pool through the negative pressure slag suction system. It can remove light organic matter and algae in the water and reduce the disinfection byproduct 2-MIB; as a post-sedimentation (pre-filtration) process, it can further stabilize the water quality before filtration, extend the filter tank backwashing cycle, and ensure the water quality after filtration.

[0067] Embodiment 2:

[0068] A dissolved air flotation algae removal and slag suction system, referring to Figure 4 and Figure 5 The difference between this embodiment and embodiment 1 is that:

[0069] The slag suction trough 312 is slidably connected to the mounting frame 311, and the slag suction trough 312 is connected to a float 319, which is used to make the slag suction trough 312 float on the water surface. The design of the slag collector 310 using the float 319 to control the height of the slag suction trough 312 shows significant advantages in the aerosol flotation algae removal slag suction system. The float 319 makes the slag suction trough 312 automatically float on the water surface, and float up and down with the water level fluctuation, without manual adjustment, which simplifies the operation process and reduces maintenance costs. At the same time, this design ensures that the slag suction trough 312 is always maintained at a suitable height, can continuously and effectively collect slag, reduces the situation of missed collection and excessive collection, and improves the processing efficiency and system stability.

[0070] Because of the surface sweeping structure 330, waves will form on the water surface when the nozzle sprays water. In order to reduce the influence of waves on the floating ball 319, a wave-breaking shell 313 is installed on the mounting frame 311. The wave-breaking shell 313 is a quadrilateral shell with openings at both ends. The upper end of the wave-breaking shell 313 is higher than the liquid surface, and the lower end thereof is submerged below the water surface and does not contact the bottom of the filter tank.

[0071] The slag suction groove 312 is located outside the wave-breaking shell 313, and is located on the side of the wave-breaking shell 313 facing the slag blowing nozzle 331. A support rod 3121 is fixedly connected to the bottom of the slag suction groove 312. The support rod 3121 is installed with a first roller 315. The bend of the wave-breaking shell 313 forms a T-shaped groove. The first roller 315 is placed in the T-shaped groove, and the slag suction groove 312 can move up and down smoothly. The support rod 3121 is connected to the floating ball 319 through a cable 314, and the wave-breaking shell 313 is provided with a through hole 3131 for the cable 314 to pass through. When the water level of the filter tank changes, the slag suction groove 312 is driven to move, so that the slag suction groove 312 can rise and fall with the rise and fall of the liquid level.

[0072] A first pulley 317 is installed at one end of the support rod 3121, a second pulley 318 is provided at the float 319, one end of the cable 314 is fixedly connected to the mounting frame 311, and the other end passes through the second pulley 318, passes through the through hole 3131, passes through the first pulley 317, and is finally fixedly connected to the mounting frame 311, wherein the height of the second pulley 318 is greater than the height of the first pulley 317. The float 319 is affected by the height of the filter tank liquid level and rises and falls, and the slag suction trough 312 is driven to rise and fall by the action of the cable 314 and the pulley, and the lifting distance is the same as that of the float 319.

[0073] Reference Figure 6 In order to make the slag suction groove 312 move more smoothly, the following settings are made:

[0074] The second pulley 318 is equipped with a connecting block 3191, and the connecting block 3191 is equipped with a second roller 316. The connecting block 3191 is sleeved in the T-shaped slot, and the second roller 316 is placed in the gap between the second T-shaped slot and the side wall of the shell. The side of the wave-proof shell 313 facing the slag blowing nozzle 331 is bent into an inwardly concave structural groove 3132, and the through hole 3131 is a rectangular through hole 3131 and is opened on the side wall of the structural groove 3132. The through hole 3131 is designed on the side wall of the structural groove 3132 to facilitate the cable 314 to pass through, reduce the friction between the cable 314 and the wave-proof guest, and improve the smoothness of the slag collector 310.

Claims

1. A dissolved air flotation algae removal and slag suction system, characterized in that: It comprises a dissolved air flotation device (200) for making impurities float to the water surface through air flotation, and a slag suction device (300) for collecting floating objects on the water surface; The dissolved air flotation device (200) comprises: A dissolved air tank is used to mix water with compressed air to form dissolved air water; The air compressor pressurizes the air and delivers it to the air dissolving tank; A return pump to transfer part of the settled water to the air dissolving tank; and A dissolved air releaser (240), which is connected to the dissolved air tank and arranged in the filter tank, is used to diffuse dissolved air water in the filter tank; The slag suction device (300) comprises: A scum collector (310) is disposed in the filter tank and its scum suction port (3122) is located below the liquid surface; The vacuum suction device (320) creates negative pressure in the scum collector (310) to absorb the scum on the liquid surface of the filter tank and transport the scum to the sludge discharge tank.

2. A dissolved air flotation algae removal and slag suction system according to claim 1, characterized in that: The dissolved air releasers (240) are provided in plurality and are all arranged on both sides of the filter tank, and the scum collector (310) is arranged at a middle position at one end of the filter tank.

3. The dissolved air flotation algae removal and slag suction system according to claim 1 is characterized by: The slag suction device (300) further comprises a surface sweeping structure (330) for sweeping the slag to the slag collector (310); the surface sweeping structure (330) comprises a slag blowing nozzle (331), the slag blowing nozzle (331) being installed at one end of the filter tank away from the slag collector (310) and at both sides of the filter tank, the slag blowing nozzle (331) being located above the liquid surface, the slag blowing nozzle (331) being oriented toward the slag collector (310), and the slag blowing nozzle (331) being connected to a sweeping pump (332) via a pipeline.

4. The dissolved air flotation algae removal and slag suction system according to claim 1, characterized in that: The scum collector (310) comprises a mounting frame (311) fixedly connected to the side wall of the filter tank and a horizontally arranged scum suction groove (312), the scum suction port (3122) is opened at the bottom of the scum suction groove (312), the mounting frame (311) is threadedly connected with two screw rods (3123), the lower ends of the screw rods (3123) are rotatably connected to the scum suction groove (312), and the top end of the screw rod (3123) is coaxially fixedly connected with a hand wheel (3124).

5. The dissolved air flotation algae removal and slag suction system according to claim 1 is characterized by: The slag collector (310) comprises a mounting frame (311) fixedly connected to the side wall of the filter tank and a horizontally arranged slag suction groove (312); the slag suction port (3122) is opened at the bottom of the slag suction groove (312); the slag suction groove (312) is slidably connected to the mounting frame (311); the slag suction groove (312) is connected to a floating ball (319); and the floating ball (319) is used to make the slag suction groove (312) float on the water surface.

6. A dissolved air flotation algae removal and slag suction system according to claim 5, characterized in that: The mounting frame (311) is provided with a wave-breaking shell (313), which is a quadrilateral shell with openings at both ends. The upper end of the wave-breaking shell (313) is higher than the liquid surface, and the lower end thereof is submerged below the water surface and does not contact the bottom of the filter tank. The slag suction groove (312) is located on the side of the wave-breaking shell (313) facing the slag blowing nozzle (331). A support rod (3121) is fixedly connected to the bottom of the slag suction groove (312). The support rod (3121) is connected to a cable (314). The cable (314) is connected to a floating ball (319). The wave-breaking shell (313) is provided with a through hole (3131) for the cable (314) to pass through.

7. A dissolved air flotation algae removal and slag suction system according to claim 6, characterized in that: A first pulley (317) is installed at one end of the support rod (3121), and the float (319) is provided with a second pulley (318). One end of the pull cable (314) is fixedly connected to the mounting frame (311), and the other end of the pull cable (314) is passed through the second pulley (318), passes through the through hole (3131), passes through the first pulley (317), and is finally fixedly connected to the mounting frame (311), wherein the height of the second pulley (318) is greater than the height of the first pulley (317).

8. A dissolved air flotation algae removal and slag suction system according to claim 7, characterized in that: The wave-breaking shell (313) is bent on one side facing the slag blowing nozzle (331) to form an inwardly concave structural groove (3132), and the through hole (3131) is a rectangular through hole and is opened on the side wall of the structural groove (3132).

9. The dissolved air flotation algae removal and slag suction system according to claim 6, characterized in that: The support rod (3121) is installed with a first roller (315), the mounting frame (311) is provided with a first T-shaped groove, and the first roller (315) is placed in the first T-shaped groove.

10. A dissolved air flotation algae removal and slag suction system according to claim 6, characterized in that: The second pulley (318) is installed with a connecting block (3191), the connecting block (3191) is installed with a second roller (316), the mounting frame (311) is provided with a second T-shaped groove, and the second roller (316) is arranged in the second T-shaped groove.

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