An upward flow suspended medium filtration system

Abstract

An upward flow suspended medium filtration system of the present invention comprises a tank body, a lower water distributor, an upper water distributor, suspended filter media, an interceptor, a sewage outlet, a water inlet pipe, an inner swirl pipe of the lower water distributor, an outer swirl pipe of the lower water distributor, a one-way valve for the water outlet of the lower water distributor, a one-way valve for sludge discharge of the lower water distributor, a one-way valve for swirl water outlet of the upper water distributor, a one-way valve for water inlet of the upper water distributor, an inlet pipe of the upper water distributor, a water outlet, a lower three-way valve, a water inlet pipe or a water inlet manifold, a sewage discharge valve, a sewage discharge pipe or a sewage discharge manifold, an upper three-way valve, a water outlet pipe or a water outlet manifold, a backwash water outlet pipe or a backwash water outlet manifold, a backwash pump, a backwash water inlet pipe or a backwash water inlet manifold, and a control system. The present invention adopts an upward flow suspended filter bed structure, with a suspended filter bed in the upper part of the tank body and a sludge storage chamber in the lower part. During operation, the liquid to be filtered flows from bottom to top and undergoes two-stage treatment of swirl centrifugal separation and deep bed filtration successively, which is particularly suitable for treating high turbidity water quality; the backwash adopts a combination of enhanced cyclic cleaning and rinsing, so the water consumption for cleaning is low and the cleaning effect is good. The present invention can ensure that the filter has a wide applicable water quality range, a long water production cycle, a high filtration accuracy, a large treatment capacity, no caking, on-line self-cleaning, no production of sewage wastewater, and efficient continuous operation.

Description

Technical Field

[0001] The present invention belongs to the field of solid-liquid separation, specifically to the field of long-term operation of chemical and water treatment filtration equipment, and relates to an upward flow suspension medium system, which is widely used to solve the problems of short water production cycle, low filtration accuracy, unsuitability for high turbidity water quality, easy caking, frequent shutdown for backwashing, and generation of a large amount of backwashing wastewater in existing medium filters. Background Art

[0002] Fixed bed medium filters are widely used in industries such as petroleum, chemical industry, energy, and water treatment. Most of the existing fixed bed medium filters adopt a downward flow working mode, that is, the liquid to be filtered passes through the fixed filter bed from top to bottom; during backwashing, the backwashing water passes through the filter bed from bottom to top. Due to the hydraulic classification effect during backwashing, the diameter distribution of the filter media particles in the filter media layer is from top to bottom: from fine to coarse, with the smallest filter media particle diameter on the surface of the filter bed and the largest filter media particle diameter at the bottom of the filter bed. Due to this arrangement structure and operation mode of the filter bed filter media, a series of operation problems such as short water production cycle, low filtration accuracy, unsuitability for high turbidity water quality, easy caking, frequent shutdown for backwashing, and generation of a large amount of backwashing wastewater occur in existing fixed bed medium filters. Especially, the problems are more prominent in terms of filtration accuracy and application of high turbidity water quality; the particle diameter of the filter media in existing fixed bed medium filters is generally above 0.5 mm, the filtration accuracy is about 20 μm, suitable for influent turbidity: about 60 NTU for single medium and about 200 NTU for multi-medium, and the backwashing wastewater is 5%-10% of the produced water. Developing a new type of filter to replace the traditional filtration system can improve the filtration accuracy and efficiency of the filter, effectively extend the operation time of the device, reduce the operation cost, and has significant economic benefits. Summary of the Invention

[0003] The technical problem to be solved by the present invention is the problems of short water production cycle, low filtration accuracy, unsuitability for high turbidity water quality, inability to clean online, and generation of a large amount of backwashing wastewater in the prior art; to provide an upward flow suspension medium filtration system, which has a long water production cycle, high filtration accuracy, wide influent turbidity range, can realize online self-cleaning, less backwashing wastewater, and can maintain the filtration effect stable for a long period.

[0004] To achieve the above object, the technical solution of the present invention is realized as follows:

[0005] An upward flow suspended medium filtration system, comprising a tank body 1, a lower water distributor 2, an upper water distributor 3, suspended filter media 4, an interceptor 5, a sewage outlet 6, a water inlet pipe 7, an inner swirl pipe 8 of the lower water distributor, an outer swirl pipe 9 of the lower water distributor, a one-way valve 10 for the water outlet of the lower water distributor, a one-way valve 11 for sludge discharge of the lower water distributor, a one-way valve 12 for swirling water outlet of the upper water distributor, a one-way valve 13 for water inlet of the upper water distributor, an inlet pipe 14 of the upper water distributor, a water outlet 15, a lower three-way valve 16, a water inlet pipe or a water inlet manifold 17, a sewage valve 18, a sewage pipe or a sewage manifold 19, an upper three-way valve 20, a water outlet pipe or a water outlet manifold 21, a backwash water outlet pipe or a backwash water outlet manifold 22, a backwash pump 23, a backwash water inlet pipe or a backwash water inlet manifold 24, and a control system; there is a lower water distributor 2 at the lower part inside the tank body 1, the lower water distributor 2 is connected to the sewage outlet 6 and tangentially connected to the water inlet pipe 7, the inner swirl pipe 8 of the lower water distributor is connected to the water inlet pipe 7, the outer swirl pipe 9 of the lower water distributor forms a jacket with the inner swirl pipe 8 of the lower water distributor, the upper end is connected to the one-way valve 10 for the water outlet of the lower water distributor, the lower end is connected to the one-way valve 11 for sludge discharge of the lower water distributor, the lower part of the outer swirl pipe 9 of the lower water distributor is a screen, and the aperture of the screen is smaller than the minimum filter media particle size; the upper water distributor 3 is at the upper part inside the tank body 1, its outlet is connected to the water outlet 15, multiple inlet pipes 14 of the upper water distributor are evenly distributed at the lower part of the upper water distributor 3, and a one-way valve 12 for swirling water outlet and a one-way valve 13 for water inlet are arranged on each inlet pipe 14 of the upper water distributor, and its function is that when backwashing, the water flow forms a swirl to drive the filter media to swirl and move, strengthening the cleaning effect; the inlet pipe 14 of the upper water distributor is of a screen structure to intercept the filter media from entering the water distributor; the suspended filter media 4 is located at the upper middle part of the tank body 1 during operation, and its bottom is flush with the top of the lower water distributor 2; the interceptor 5 is located between the upper water distributor 14 and the lower water distributor 2 and is buried in the suspended filter media 4, and its function is to touch the filter media during backwashing, strengthening the cleaning effect; the water inlet pipe 7 of the tank body 1 is connected to the water inlet pipe or the water inlet manifold 17 and the backwash water inlet pipe or the backwash water inlet manifold 24 through the lower three-way valve 16, the other end of the water inlet pipe 7 is tangentially connected to the shell of the lower water distributor 2, the water outlet 15 of the tank body 1 is connected to the water outlet pipe or the water outlet manifold 21 and the backwash water outlet pipe or the backwash water outlet manifold 22 through the upper three-way valve 20, the sewage outlet 6 of the tank body 1 is connected to the sewage pipe or the sewage manifold 19 through the sewage valve 18, the water inlet of the backwash pump 23 is connected to the lower three-way valve 16 through the backwash water inlet pipe or the backwash water inlet manifold 24, and the water outlet of the backwash pump 23 is connected to the upper three-way valve 20 through the backwash water outlet pipe or the backwash water outlet manifold 22.

[0006] The described upward flow suspended medium filtration system is characterized in that during operation, the middle and upper part inside the tank body 1 is a filter bed composed of suspended filter media 4, and the lower part of the tank body 1 is a sludge storage chamber. The liquid to be treated generates a swirl under the action of the lower water distributor 2, and after the first-stage swirl solid-liquid separation, it enters the filter bed through the water outlet at the bottom of the suspended filter media layer for secondary solid-liquid separation. This multiple filtration and purification of the liquid to be filtered ensure a high-precision filtration effect and are suitable for the treatment of high-turbidity water quality.

[0007] The described upward flow suspended medium filtration system is characterized in that the position of the water outlet of the lower water distributor 2 is close to the bottom of the suspended filter bed and the position can be adjusted. Such a structure can ensure that no or only a thin layer of filter cake accumulates on the surface of the filter bed through the hydraulic impact of the water outlet. In this way, the water production cycle of the filter bed can be greatly extended while ensuring the water outlet precision, and it can treat water with high turbidity and high suspended solids.

[0008] The described upward flow suspended medium filtration system is characterized in that it combines the strong circulation cleaning and rinsing of the filter media; the strong circulation cleaning is composed of a strong circulation backwashing system consisting of a backwashing pump 23, a one-way valve 12 for the swirling water outlet of the upper water distributor, and an interceptor 5; during backwashing, the backwashing water enters the one-way valve 12 for the swirling water outlet of the upper water distributor under the action of the backwashing pump 23 to generate a swirl, pushing the suspended filter media to rotate downward. During the rotating flow process, the filter media repeatedly rubs and touches the interceptor 5, thus realizing the strong circulation cleaning of the filter media, and then rinsing with clean water can be carried out; no waste water is discharged during the strong circulation cleaning process, and only a small amount of sewage is discharged during rinsing, which not only ensures the cleaning effect but also avoids the generation of a large amount of cleaning waste water.

[0009] The described upward flow suspended medium filtration system is characterized in that it is a combination of a backwashing pump and a single set of tank body and multiple sets of tank bodies; the backwashing pump can either form a filtration system with a single set of tank body or form a filtration system with more than two sets of tank bodies. At this time, the flow rate of the backwashing pump only needs to meet the washing flow rate of one filter. The working mode of the washing pump is to wash multiple tank bodies one by one.

[0010] The described upward flow suspended medium filtration system is characterized in that it is a combination mode of multiple tank bodies. Multiple filters can be arranged vertically or horizontally, and the number of filters is more than two. In this way, large-flow treatment by the filters and small floor area can be achieved.

[0011] The described upward flow suspended medium filtration system is characterized in that the suspended filter media can be of single material or a combination of multiple materials, and can be solid or hollow, and it is in a floating state in the liquid to be filtered.

[0012] Advantages of the present invention: It can ensure that the filter is applicable to a wide range of water qualities, has a long water production cycle, high filtration accuracy, large processing capacity, does not cake, can be self-cleaned online, does not produce sewage wastewater, and operates efficiently and continuously. Description of the Drawings

[0013] Figure 1 It is a schematic diagram of the overall structure of the upward flow suspended medium filtration system described above, and the tank body is a single tank structure.

[0014] Figure 2 It is a schematic diagram of the overall structure of the upward flow suspended medium filtration system described above, and the tank body is a multi-tank structure.

[0015] An upward flow suspended medium filtration system, as Figure 1 shown, includes a tank body 1, a lower water distributor 2, an upper water distributor 3, suspended filter media 4, an interceptor 5, a sewage outlet 6, a water inlet pipe 7, an inner swirl pipe 8 of the lower water distributor, an outer swirl pipe 9 of the lower water distributor, a one-way valve 10 for the outlet of the lower water distributor, a one-way valve 11 for sludge discharge of the lower water distributor, a one-way valve 12 for swirling water outlet of the upper water distributor, a one-way valve 13 for water inlet of the upper water distributor, an inlet pipe 14 of the upper water distributor, a water outlet 15, a lower three-way valve 16, a water inlet pipe or a water inlet manifold 17, a sewage valve 18, a sewage pipe or a sewage manifold 19, an upper three-way valve 20, a water outlet pipe or a water outlet manifold 21, a backwash water outlet pipe or a backwash water outlet manifold 22, a backwash pump 23, a backwash water inlet pipe or a backwash water inlet manifold 24, and a control system.

[0016] Filtration process: The liquid to be filtered enters the lower water distributor 2 through the water inlet pipe or the water inlet manifold 17, the lower three-way valve 16, and the water inlet pipe 7. A high-speed swirl is generated in the lower water distributor 2 and the liquid moves upward along the inner swirl pipe 8 of the lower water distributor. During this process, due to the action of centrifugal force, the suspended solids in the liquid move close to the pipe wall while the liquid moves in the middle of the pipe. When reaching the upper end of the inner swirl pipe 8 of the lower water distributor, the suspended solids in the liquid enter the outer swirl pipe 9 of the lower water distributor under the action of centrifugal force and move downward through the one-way valve 11 for sludge discharge of the lower water distributor to the bottom of the tank body, while the separated liquid continues to move upward, opens the one-way valve 10 for the outlet of the lower water distributor and enters the filter bed at the lower part of the tank body. When passing through the filter bed, the suspended solids in the liquid to be filtered are intercepted and adsorbed by the filter media in the filter bed. The liquid enters the inlet pipe 14 of the upper water distributor, passes through the one-way valve 13 for water inlet of the upper water distributor, the upper water distributor 3, the water outlet 15, and the upper three-way valve 20 to reach the water outlet pipe or the water outlet manifold 21, thus completing the filtration process; during this process, the liquid to be filtered completes two solid-liquid separations. The first is in the swirl pipe inside the lower water distributor 2, and the second is completed in the suspended filter bed; in order to ensure the filtration effect in the filter bed and extend the water production cycle of the filter bed, the position of the water outlet of the lower water distributor 2 is close to the bottom of the suspended filter bed and the position can be adjusted. This structure can ensure that no or only a thin layer of filter cake accumulates on the surface of the filter bed through the hydraulic impact of the water outlet.

[0017] Backwashing process: The cleaning of the filter media combines strong circulation cleaning and rinsing.

[0018] Strong circulation cleaning process: The cleaning liquid passes from the lower part of the tank body through the lower screen of the outer swirl tube 9 of the lower water distributor, the inner swirl tube 8 of the lower water distributor, the lower water distributor 2, the water inlet pipe 7, the lower three-way valve 16, the backwashing water inlet pipe or the backwashing water inlet manifold 24 to reach the backwashing pump 23. After pressurization, it then passes through the backwashing water outlet pipe or the backwashing water outlet manifold 22, the upper three-way valve 20, the water outlet 15, the upper water distributor 3, and the swirling water outlet check valve 12 of the upper water distributor to enter the upper part of the tank body. Due to the swirling action of the swirling water outlet check valve 12 of the upper water distributor, the liquid generates a swirl in the tank body and flows downward, thereby driving the filter media to rotate and move and collide with the interceptor 5 multiple times. The suspended matter is separated from the filter media. At this time, control the flow rate of the backwashing pump to make the suspended filter media expand reasonably, so that the distance between the suspended filter media and the bottom of the tank body is maintained at a certain height. The suspended matter settles and moves downward to the bottom of the tank body under the action of gravity and fluid, thus completing the strong cleaning. The strong cleaning can be carried out cyclically, and the cycle time is determined according to the bonding condition of the filter media and the suspended matter.

[0019] Rinsing process: After the strong cleaning is completed, turn off the washing pump and open the drain valve 18. Let the clean liquid enter the upper part of the tank body from the water outlet pipe or the water outlet manifold 21, through the upper three-way valve 20, the water outlet 15, the upper water distributor 3, and the swirling water outlet check valve 12 of the upper water distributor, flow through the suspended filter media 4. After completing the cleaning of the suspended filter media 4, it enters the bottom of the tank body along with the suspended matter, and is discharged through the lower water distributor 2, the drain port 6, the drain valve 18, and the drain pipe or the drain manifold 19, thus completing the rinsing process. Only the water volume in the tank body above the top of the lower water distributor 2 needs to be discharged during rinsing. Therefore, the backwashing wastewater consumption of this filtration system is very small, far lower than that of other filters. Specific implementation mode

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Example 1, as shown in the appendix Figure 1 It includes a tank body 1, a lower water distributor 2, an upper water distributor 3, suspended filter media 4, an interceptor 5, a drain port 6, a water inlet pipe 7, an inner swirl tube 8 of the lower water distributor, an outer swirl tube 9 of the lower water distributor, a check valve 10 for the water outlet of the lower water distributor, a sludge discharge check valve 11 for the lower water distributor, a swirling water outlet check valve 12 of the upper water distributor, a water inlet check valve 13 of the upper water distributor, an inlet pipe 14 of the upper water distributor, a water outlet 15, a lower three-way valve 16, a water inlet pipe or a water inlet manifold 17, a drain valve 18, a drain pipe or a drain manifold 19, an upper three-way valve 20, a water outlet pipe or a water outlet manifold 21, a backwashing water outlet pipe or a backwashing water outlet manifold 22, a backwashing pump 23, a backwashing water inlet pipe or a backwashing water inlet manifold 24, and a control system.

[0022] An upward-flow suspended medium filtration system has the following working process: Adjust the lower three-way valve 16 and the upper three-way valve 20 to the filtration state. The liquid to be filtered enters the lower distributor 2 from the water inlet pipe or water inlet manifold 17, the lower three-way valve 16, and the water inlet pipe 7. A high-speed swirl is generated in the lower distributor 2 and moves upward along the swirl pipe 8 inside the lower distributor. During this process, due to the action of centrifugal force, the suspended solids in the liquid move close to the pipe wall while the liquid moves in the middle of the pipe. When reaching the upper end of the swirl pipe 8 inside the lower distributor, the suspended solids in the liquid enter the outer swirl pipe 9 of the lower distributor under the action of centrifugal force and move downward through the sludge discharge check valve 11 of the lower distributor to the bottom of the tank. The separated liquid continues to move upward, opens the check valve 10 at the outlet of the lower distributor, and enters the filter bed at the lower part of the tank. When passing through the filter bed, the suspended solids in the liquid to be filtered are intercepted and adsorbed by the filter media in the filter bed. The liquid enters the water inlet pipe 14 of the upper distributor, passes through the check valve 13 at the water inlet of the upper distributor, the upper distributor 3, the outlet 15, and the upper three-way valve 20 to reach the water outlet pipe or water outlet manifold 21, thus completing the filtration process. When the filtration system has worked for a certain period of time and the suspended solids in the filter bed reach saturation and need to clean the filter media in the filter bed, at this time, adjust the lower three-way valve 16 and the upper three-way valve 20 to the cleaning state, and turn on the backwash pump 23. The cleaning liquid enters the backwash pump 23 from the lower part of the tank through the screen at the lower part of the outer swirl pipe 9 of the lower distributor, the swirl pipe 8 inside the lower distributor, the lower distributor 2, the water inlet pipe 7, the lower three-way valve 16, and the backwash water inlet pipe or backwash water inlet manifold 24. After being pressurized, it then passes through the backwash water outlet pipe or backwash water outlet manifold 22, the upper three-way valve 20, the outlet 15, the upper distributor 3, and the swirl water outlet check valve 12 of the upper distributor and enters the upper part of the tank. Due to the swirl action of the swirl water outlet check valve 12 of the upper distributor, the liquid generates a swirl in the tank and flows downward, thereby driving the filter media to rotate and move and having multiple frictions and contacts with the interceptor 5. The suspended solids are peeled off from the filter media. At this time, control the flow rate of the backwash pump to make the suspended filter media expand reasonably, so that the distance between the suspended filter media and the bottom of the tank is maintained at a certain height, and the suspended solids precipitate and move downward to the bottom of the tank under the action of gravity and fluid, thus completing the strong cleaning process. After the strong cleaning is completed, enter the rinsing process. First, turn off the backwash pump 23, adjust the upper three-way valve 20 to the filtration state, adjust the lower three-way valve 16 to the cleaning state, and open the drain valve 18. The clean liquid enters the upper part of the tank from the water outlet pipe or water outlet manifold 21, passes through the upper three-way valve 20, the outlet 15, the upper distributor 3, and the swirl water outlet check valve 12 of the upper distributor, flows through the suspended filter media 4. After cleaning the suspended filter media 4, it enters the bottom of the tank together with the suspended solids, passes through the lower distributor 2, the drain port 6, the drain valve 18, and the drain pipe or drain manifold 19 and is discharged, thus completing the rinsing process.

[0023] This designed filtration system features a long water production cycle, high filtration precision, a wide range of influent turbidity, less backwash wastewater, and can operate in a long cycle.

[0024] Example 2, as shown in the appendix Figure 2 The filter tank body is a multi-tank structure.

[0025] Adjust the upper three-way valves 20 on all the tanks to the filtration state and the lower three-way valves 16 to the filtration state. Under the action of the water supply pump or water supply system, the liquid to be filtered is supplied to each filter tank body simultaneously from the water inlet pipe or water inlet manifold 17, and all the tank bodies of the filtration system are in the filtration state; when one of the tank bodies needs to clean the filter bed filter material, first adjust the upper three-way valve 20 of this tank body to the cleaning state and adjust the lower three-way valve 16 of this tank body to the cleaning state, then turn on the backwash pump 23, and this tank body enters the strong circulation cleaning. After a certain period of time, turn off the backwash pump 23, adjust the upper three-way valve 20 of this tank body to the filtration state, adjust the lower three-way valve 16 of this tank body to the cleaning state, open the drain valve 18 of this tank body, and this tank body is in the rinsing state. After the rinsing is completed, close the drain valve 18 and adjust the lower three-way valve 16 of this tank body to the filtration state. In this way, the cleaning of this tank body is completed, and the tank body enters the filtration state again. When this tank body is in the cleaning state, the other tank bodies are all in the filtration state. After one tank body is cleaned, then move on to the next tank body for cleaning, and the cleaning of all the tank bodies is completed in sequence.

[0026] Such a design can enable the filter system to achieve large-flow filtration, on-line self-cleaning, without generating sewage wastewater, greatly improving the filter efficiency and saving water resources.

Claims

1. An upward flow suspended medium filtration system, comprising a tank body, a lower water distributor, an upper water distributor, suspended filter media, an interceptor, a sewage outlet, a water inlet pipe, an inner swirl pipe of the lower water distributor, an outer swirl pipe of the lower water distributor, a one-way valve for the water outlet of the lower water distributor, a one-way valve for sludge discharge of the lower water distributor, a one-way valve for swirling water outlet of the upper water distributor, a one-way valve for water inlet of the upper water distributor, an inlet pipe of the upper water distributor, a water outlet, a lower three-way valve, a water inlet pipe or a water inlet manifold, a sewage discharge valve, a sewage discharge pipe or a sewage discharge manifold, an upper three-way valve, a water outlet pipe or a water outlet manifold, a backwash water outlet pipe or a backwash water outlet manifold, a backwash pump, a backwash water inlet pipe or a backwash water inlet manifold, and a control system; there is a lower water distributor at the lower part inside the tank body, the lower water distributor is connected to the sewage outlet and tangentially connected to the water inlet pipe, the inner swirl pipe of the lower water distributor is connected to the water inlet pipe, the outer swirl pipe of the lower water distributor forms a jacket with the inner swirl pipe of the lower water distributor, the upper end is connected to the one-way valve for the water outlet of the lower water distributor, the lower end is connected to the one-way valve for sludge discharge of the lower water distributor, the lower part of the outer swirl pipe of the lower water distributor is a screen, and the aperture of the screen is smaller than the minimum particle size of the filter media; the upper water distributor is at the upper part inside the tank body, its outlet is connected to the water outlet, multiple inlet pipes of the upper water distributor are evenly distributed at the lower part of the upper water distributor, and a one-way valve for swirling water outlet of the upper water distributor and a one-way valve for water inlet of the upper water distributor are arranged on each inlet pipe of the upper water distributor, and its function is to form a swirl of water flow during backwashing to drive the filter media to move in a swirl, strengthening the cleaning effect; the inlet pipe of the upper water distributor is of a screen structure to intercept the filter media from entering the water distributor; the suspended filter media is located at the upper-middle part of the tank body during operation, and its bottom is flush with the top of the lower water distributor; the interceptor is located between the upper water distributor and the lower water distributor and is buried in the suspended filter media, and its function is to collide with the filter media during backwashing to strengthen the cleaning effect; the water inlet pipe of the tank body is connected to the water inlet pipe or the water inlet manifold, the backwash water inlet pipe or the backwash water inlet manifold through the lower three-way valve, the other end of the water inlet pipe is tangentially connected to the shell of the lower water distributor, the water outlet of the tank body is connected to the water outlet pipe or the water outlet manifold, the backwash water outlet pipe or the backwash water outlet manifold through the upper three-way valve, the sewage outlet of the tank body is connected to the sewage discharge pipe or the sewage discharge manifold through the sewage discharge valve, the water inlet of the backwash pump is connected to the lower three-way valve through the backwash water inlet pipe or the backwash water inlet manifold, and the water outlet of the backwash pump is connected to the upper three-way valve through the backwash water outlet pipe or the backwash water outlet manifold.

2. The upflow suspended medium filtration system according to claim 1, characterized in that: The position of the water outlet of the lower water distributor is close to the bottom of the suspended filter bed and the position can be adjusted. Such a structure can ensure that no or only a thin layer of filter cake accumulates on the surface of the filter bed through the hydraulic impact of the water outlet, can greatly extend the water production cycle of the filter bed under the condition of ensuring the water outlet accuracy, and can treat water quality with high turbidity and high suspended solids.

3. The upflow suspended medium filtration system according to claim 1, characterized in that: Combination of strong cyclic cleaning and rinsing of filter media; the strong cyclic cleaning is achieved by a strong cyclic backwashing system composed of a backwashing pump, a rotary outflow check valve of the upper water distributor, and an interceptor; during backwashing, the backwashing water enters the rotary outflow check valve of the upper water distributor under the action of the backwashing pump and generates a swirl, pushing the suspended filter media to rotate downward, and the filter media undergoes multiple frictions and contacts with the interceptor during the rotation process, thus realizing the strong cyclic cleaning of the filter media, and then rinsing is carried out with clean water; no wastewater is discharged during the strong cyclic cleaning process, and only a small amount of sewage is discharged during rinsing, which not only ensures the cleaning effect but also avoids the generation of a large amount of cleaning wastewater.

4. The upflow suspended medium filtration system according to claim 1, characterized in that: Combination of a backwashing pump with a single tank and multiple tanks; the backwashing pump can either form a filtration system with a single tank or form a filtration system with more than two multiple tanks. At this time, the flow rate of the backwashing pump only needs to meet the flushing flow rate of one tank, and the working mode of the flushing pump is to flush multiple tanks one by one.

5. The upflow suspended medium filtration system according to claim 1, characterized in that: Combination method of multiple tanks. Multiple filters can be arranged vertically or horizontally, and the number of filters is more than two, so that large-flow processing of the filters can be achieved with a small floor area.

6. The upflow suspended medium filtration system according to claim 1, characterized in that: The suspended filter media can be of a single material or a combination of multiple materials, and can be a solid or hollow body, and it is in a floating state in the liquid to be filtered.

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