Filtering device and backwashing method

Abstract

The application discloses a filtering device and a backwashing method. The filtering device comprises a tank body for containing backwashing water in a backwashing stage, and the tank body is provided with water inlet and outlet ports; granular magnetic filter material is arranged in the tank body; a magnetic stirrer host is arranged on the outer surface of the tank body, and the magnetic stirrer host is arranged away from the water inlet and outlet ports; the magnetic stirrer host comprises a rotatable driving magnet, and the driving magnet is used for being magnetically coupled with the magnetic filter material in the process of cleaning the magnetic filter material, so that the magnetic filter material rotates in the tank body with the backwashing water. Since the magnetic filter material can be magnetically coupled with the driving magnet of the magnetic stirrer host and rotates in the tank body with the backwashing water when the magnetic stirrer host is turned on, the backwashing water can repeatedly wash the surface of the magnetic filter material under the action of centrifugal force, and the pollutants on the surface of the magnetic filter material are removed, so that the desorption speed of the pollutants on the magnetic filter material is improved, the cleanliness of the magnetic filter material after backwashing is improved, and the consumption of the backwashing water is reduced.

Description

Technical Field

[0001] This invention relates to the field of filter technology, and more particularly to a filter device and a backwashing method. Background Technology

[0002] With the increasing demand for industrial water treatment, filtration technology, as the core means of removing suspended solids, colloids and dissolved organic matter, has been widely used.

[0003] The filtration device can effectively remove suspended solids from sewage and has a significant removal effect on pollutants such as colloids, organic matter, pesticides, and heavy metals in sewage.

[0004] During the operation of a filtration device, contaminants gradually adhere to the surface of the filter media, leading to poor filtration performance after a period of operation. In this case, backwashing is necessary to desorb the contaminants from the filter media surface and restore the filtration capacity of the device.

[0005] However, the efficiency of backwashing the filter device still needs to be improved. Summary of the Invention

[0006] The problem solved by the embodiments of the present invention is to provide a filtration device and a backwashing method to improve the backwashing efficiency of the filtration device.

[0007] To address the aforementioned problems, embodiments of the present invention provide a filtration device, comprising: a tank for containing backwash water during the backwashing stage, the tank having inlet and outlet ports; granular magnetic filter media disposed within the tank; and a magnetic stirrer main unit disposed on the outer surface of the tank, the magnetic stirrer main unit being disposed away from the inlet and outlet ports, the magnetic stirrer main unit including a rotatable drive magnet, the drive magnet being used to magnetically couple with the magnetic filter media during the cleaning process, thereby causing the magnetic filter media to rotate within the tank containing backwash water.

[0008] Optionally, the filtration device may further include a pipeline connected to the inlet and outlet, and the pipeline is equipped with a valve.

[0009] Optionally, the inlet and outlet include a first inlet and outlet and a second inlet and outlet located above the first inlet and outlet. The second inlet and outlet is used as an inlet during the filtration stage and as an outlet during the backwashing stage. The first inlet and outlet is used as an outlet during the filtration stage and as an inlet during the backwashing stage.

[0010] Optionally, the filtration device further includes a pipeline connected to the inlet and outlet; the pipeline includes: a first pipeline connected to the first inlet and outlet, wherein a first valve is provided on the first pipeline; and a second pipeline connected to the second inlet and outlet, wherein a second valve is provided on the second pipeline.

[0011] Optionally, the filtration device further includes a controller, which is coupled to the valve and the magnetic stirrer main unit, respectively.

[0012] Optionally, the magnetic stirrer main unit is disposed on the bottom surface of the tank.

[0013] Optionally, the inlet and outlet include a first inlet and outlet located on the top surface of the tank and a second inlet and outlet located on the side wall of the tank and near the bottom of the tank. The second inlet and outlet is used as an inlet during the filtration stage and as an outlet during the backwashing stage. The first inlet and outlet is used as an outlet during the filtration stage and as an inlet during the backwashing stage. The magnetic stirrer main unit is disposed on the bottom surface of the tank.

[0014] Optionally, the magnetic filter material includes one or two of magnetic activated carbon and magnetic biological activated carbon; the magnetic biological activated carbon is magnetic activated carbon with microbial flora on its surface or in its pores for decomposing organic matter.

[0015] Optionally, the microbial community includes one or more of β-proteobacteria, α-proteobacteria, and nitrifying bacteria.

[0016] Optionally, the volume of the magnetic filter media accounts for 75% to 80% of the volume of the tank.

[0017] Optionally, the tank body may be made of fiberglass.

[0018] Optionally, the inlet and outlet include a first inlet and outlet, a second inlet and outlet located above the first inlet and outlet, and a third inlet located below the first inlet and outlet; the first inlet and outlet is used as an outlet during the filtration stage and as an inlet during the backwashing stage; the second inlet and outlet is used as an inlet during the filtration stage; and the third inlet and outlet is used as an outlet during the backwashing stage.

[0019] Accordingly, embodiments of the present invention also provide a backwashing method, which is performed using the filtration device described in any embodiment of the present invention. The backwashing method includes: allowing backwash water to flow into the tank of the filtration device through the inlet and outlet, and submerging the magnetic filter media with the backwash water; after the magnetic filter media is submerged, sealing the backwash water in the tank; after the backwash water is sealed in the tank, turning on the magnetic stirrer to rotate the granular magnetic filter media in the tank containing the backwash water to clean the magnetic filter media; and after cleaning the magnetic filter media, discharging the backwash water through the inlet and outlet.

[0020] Optionally, the granular magnetic filter media is rotated in the tank for 15 to 20 minutes, and the rotation speed of the motor of the magnetic stirrer is in the range of 40 to 60 rpm.

[0021] Optionally, the step of rotating the granular magnetic filter media in the tank containing the backwash water includes: rotating the granular magnetic filter media alternately clockwise and counterclockwise in the tank containing the backwash water.

[0022] Optionally, in the step of alternating clockwise and counterclockwise rotation of the granular magnetic filter media in the tank containing the backwash water, the clockwise rotation time of the granular magnetic filter media in the tank is 7.5 to 10 minutes each time, and the counterclockwise rotation time of the granular magnetic filter media in the tank is 7.5 to 10 minutes each time, and the alternating clockwise and counterclockwise rotations are performed twice.

[0023] Optionally, the inlet and outlet include a first inlet and outlet, and a second inlet and outlet located above the first inlet and outlet. The second inlet and outlet serves as an inlet during the filtration stage and an outlet during the backwashing stage. The first inlet and outlet serves as an outlet during the filtration stage and an inlet during the backwashing stage. During the discharge of the backwash water, clean water is also injected into the tank through the first inlet and outlet, so that the backwash water overflows from the tank through the second inlet and outlet. Alternatively, the inlet and outlet include a first inlet and outlet, a second inlet and outlet located above the first inlet and outlet, and a third inlet located below the first inlet and outlet. The first inlet and outlet serves as an outlet during the filtration stage and an inlet during the backwashing stage. The second inlet and outlet serves as an inlet during the filtration stage. The third inlet and outlet serves as an outlet during the backwashing stage. During the discharge of the backwash water, the backwash water is discharged through the third inlet and outlet.

[0024] Optionally, in the step of allowing backwash water to flow into the tank of the filter device, an alkaline solution or an acidic solution may also be introduced into the tank.

[0025] Compared with the prior art, the technical solution of the embodiments of the present invention has the following advantages: The filtration device provided in this embodiment of the invention includes: granular magnetic filter media disposed in the tank, and a magnetic stirrer main unit disposed on the outer surface of the tank, avoiding the inlet and outlet. The magnetic stirrer main unit includes a rotatable drive magnet, which is used to magnetically couple with the magnetic filter media during the cleaning process, so that the magnetic filter media rotates in the tank containing backwash water. Since the magnetic filter media can magnetically couple with the drive magnet of the magnetic stirrer main unit and rotate in the tank containing backwash water when the magnetic stirrer main unit is turned on, the backwash water can repeatedly rinse the surface of the magnetic filter media under the action of centrifugal force, removing contaminants from the surface of the magnetic filter media. This is beneficial for increasing the desorption rate of contaminants on the magnetic filter media during the backwashing stage, improving the cleanliness of the magnetic filter media after backwashing, and reducing the consumption of backwash water. Therefore, it can improve the efficiency and effect of backwashing while reducing backwash water consumption, and correspondingly, it also helps to extend the service life of the magnetic filter media. Moreover, granular magnetic filter media is not easily broken during rotation, which helps reduce the loss of magnetic filter media and correspondingly reduces the probability of magnetic filter media forming fine powder or debris due to breakage, thereby reducing the risk of clogging of the filter device components. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of an embodiment of the filtration device of the present invention; Figure 2 This is a schematic diagram of the structure of the magnetic stirrer main unit in one embodiment of the filtration device of the present invention; Figure 3 This is a schematic diagram of another embodiment of the filtration device of the present invention; Figure 4 This is a flowchart of an embodiment of the backwashing method of the present invention. Detailed Implementation

[0027] As is known from the background technology, filtration devices require backwashing after a period of operation to remove contaminants adhering to the surface of the filter media. However, research has found that simple backwashing cannot completely desorb contaminants from the filter media surface, especially stubborn contaminants, resulting in a shorter service life for the filter media. Moreover, the backwashing process consumes a large amount of backwash water, leading to high backwashing costs.

[0028] To address the aforementioned technical problems, this invention provides a filtration device comprising: granular magnetic filter media disposed in a tank; and a magnetic stirrer main unit disposed on the outer surface of the tank, avoiding the inlet and outlet. The magnetic stirrer main unit includes a rotatable drive magnet, which is used to magnetically couple with the magnetic filter media during the cleaning process, causing the magnetic filter media to rotate within the tank containing backwash water. When the magnetic stirrer main unit is activated, the magnetic filter media can magnetically couple with the drive magnet of the magnetic stirrer main unit and rotate within the tank containing backwash water. This allows the backwash water to repeatedly rinse the surface of the magnetic filter media under centrifugal force, removing contaminants from the surface. This improves the desorption rate of contaminants on the magnetic filter media during the backwashing stage, increases the cleanliness of the magnetic filter media after backwashing, and reduces backwash water consumption. Consequently, it improves the efficiency and effectiveness of backwashing while minimizing backwash water consumption, and also extends the service life of the magnetic filter media. Moreover, granular magnetic filter media is not easily broken during rotation, which helps reduce the loss of magnetic filter media and correspondingly reduces the probability of magnetic filter media forming fine powder or debris due to breakage, thereby reducing the risk of clogging of the filter device components.

[0029] To make the above-mentioned objects, features and advantages of the embodiments of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] Figure 1 This is a schematic diagram of an embodiment of the filtration device of the present invention. Figure 2 This is a schematic diagram of the structure of the magnetic stirrer main unit in one embodiment of the filtration device of the present invention. Figure 3 This is a schematic diagram of another embodiment of the filtering device of the present invention.

[0031] refer to Figures 1 to 3 The filtration device includes: a tank 100 for containing backwash water during the backwashing stage, the tank 100 having inlet and outlet ports 103; granular magnetic filter media 105 disposed in the tank 100; and a magnetic stirrer main unit 120 disposed on the outer surface of the tank 100, the magnetic stirrer main unit 120 being disposed away from the inlet and outlet ports 103, the magnetic stirrer main unit 120 including a rotatable drive magnet 121, the drive magnet 121 being used to magnetically couple with the magnetic filter media 105 during the cleaning process, so that the magnetic filter media 105 rotates within the tank 100 containing backwash water.

[0032] Tank 100 is used to contain magnetic filter media 105, thereby providing an operational basis for filtration or backwashing. Specifically, during the cleaning of magnetic filter media 105, tank 100 is used to contain backwash water.

[0033] In some embodiments, the material of the tank 100 includes fiber reinforced plastic (FRP). Specifically, FRP includes glass fiber reinforced plastic, S-glass fiber reinforced plastic, carbon fiber reinforced plastic, basalt fiber reinforced plastic, etc. In other embodiments, the material of the tank may also be other non-magnetic materials, such as non-magnetic stainless steel (austenitic stainless steel), Hastelloy, etc.

[0034] Before filtration, the water to be filtered flows into the tank 100 through the inlet / outlet 103 and passes through the magnetic filter media 105 for filtration. After filtration, the filtered water flows out of the tank 100 through the inlet / outlet 103.

[0035] During the preparation process before cleaning the magnetic filter media 105, backwash water flows into the tank 100 through the inlet and outlet 103. The backwash water carries away the contaminants on the surface of the magnetic filter media 105. After cleaning the magnetic filter media 105, the backwash water flows out of the tank 100 through the inlet and outlet 103.

[0036] In some embodiments, such as Figure 1 As shown, the inlet and outlet 103 includes a first inlet and outlet 101 and a second inlet and outlet 102 located above the first inlet and outlet 101. The second inlet and outlet 102 is used as an inlet in the filtration stage and as an outlet in the backwashing stage. The first inlet and outlet 101 is used as an outlet in the filtration stage and as an inlet in the backwashing stage.

[0037] The inlet and outlet 103 includes a first inlet and outlet 101 and a second inlet and outlet 102, enabling the filter device 10 to operate continuously during the filtration stage, thereby improving the working efficiency of the filter device 10. The second inlet and outlet 102, serving as the inlet for filtration, is located above the first inlet and outlet 101, allowing the magnetic filter media 105 through which the water to be filtered to flow to be filtered to have a larger volume, thus improving the physicochemical properties of the filtered water.

[0038] Moreover, the inlet is located above the outlet, which allows the water to be filtered to flow from top to bottom, forming a smooth filtration path. This avoids short-circuiting or mixing between the inlet and outlet, and also helps to improve the physicochemical properties of the filtered water.

[0039] The second inlet / outlet 102 is used as an inlet during the filtration stage and as an outlet during the backwashing stage, while the first inlet / outlet 101 is used as an outlet during the filtration stage and as an inlet during the backwashing stage. This allows both the first inlet / outlet 101 and the second inlet / outlet 102 to be used during the filtration and backwashing stages, thereby simplifying the structure of the filtration device 10.

[0040] Using the outlet of the filtration stage as the inlet of the backwash stage is beneficial to reduce the probability of contaminants in the backwash water polluting the connection between the first inlet and outlet 101 and the area near the first inlet and outlet 101 during the backwash water discharge process after cleaning the magnetic filter media 105. This helps to reduce the impact of backwashing on subsequent filtration.

[0041] In other embodiments, the filtration device may also have only one inlet and outlet located on the side wall of the tank near the bottom of the tank.

[0042] As an example, the inlet / outlet 103 includes a first inlet / outlet 101 located on the top surface of the tank 100 and a second inlet / outlet 102 located on the side wall of the tank 100 and near the bottom of the tank 100.

[0043] The first inlet / outlet 101 is located on the top surface of the tank 100, and the second inlet / outlet 102 is located on the side wall of the tank 100 near the bottom of the tank 100, which can reserve the position for the magnetic stirrer main unit 120 to be installed on the bottom surface of the tank 100.

[0044] In some embodiments, the filtration device 10 further includes a pipe 110 communicating with the inlet and outlet, and a valve 115 is provided on the pipe 110.

[0045] Valve 115 is used to open or close pipeline 110. Specifically, valve 115 is used to open pipeline during the filtration stage and to close pipeline 110 before cleaning magnetic filter media 105, so that backwash water can be sealed inside tank 100 during the cleaning of magnetic filter media 105, thereby improving the convenience of sealing backwash water inside tank 100. Valve 115 is also used to open pipeline 110 after cleaning magnetic filter media 105 to allow backwash water in tank 100 to be discharged.

[0046] In one specific embodiment, the inlet / outlet 103 includes a first inlet / outlet 101 and a second inlet / outlet 102 located above the first inlet / outlet 101. The second inlet / outlet 102 is used as an inlet during the filtration stage and as an outlet during the backwashing stage. The first inlet / outlet 101 is used as an outlet during the filtration stage and as an inlet during the backwashing stage. The filtration device 10 also includes a pipe 110 connected to the inlet / outlet 103. The pipe 110 includes: a first pipe 111 connected to the first inlet / outlet 101, with a first valve 116 provided on the first pipe 111; and a second pipe 112 connected to the second inlet / outlet 102, with a second valve 117 provided on the second pipe 112.

[0047] Before filtration, the water to be filtered flows into the tank 100 through the second pipe 112 and the second inlet / outlet 102. After filtration, the filtered water flows out of the tank 100 through the first pipe 111 and the first inlet / outlet 101.

[0048] During the preparation process before cleaning the magnetic filter media 105, backwash water flows into the tank 100 through the first pipeline 111 and the first inlet / outlet 101. The backwash water carries away the contaminants on the surface of the magnetic filter media 105. After cleaning the magnetic filter media 105, the backwash water flows out of the tank 100 through the second inlet / outlet 102 and the second pipeline 112.

[0049] The first valve 116 is used to open or close the first pipeline 111, and the second valve 117 is used to open or close the second pipeline 112.

[0050] Specifically, the first valve 116 is used to open the first pipeline 111 during the filtration stage, and the second valve 117 is used to open the second pipeline 112 during the filtration stage. During the preparation process before cleaning the magnetic filter media 105, the second valve 117 is used to close the second pipeline 112, and the first valve 116 is used to open the first pipeline 111, allowing backwash water to flow into the tank 100 via the first pipeline 111 and the first inlet / outlet 101. During the cleaning of the magnetic filter media 105, the first valve 116 is used to close the first pipeline 111, and the second valve 117 is used to close the second pipeline 112, sealing the backwash water within the tank 100, thereby improving the convenience of sealing the backwash water within the tank 100. The second valve 117 is also used to open the second pipeline 112 after cleaning the magnetic filter media 105, allowing the backwash water in the tank 100 to drain.

[0051] More specifically, pumps (not shown) are installed on both the first pipeline 111 and the second pipeline 112. The pump on the first pipeline 111 is used to allow backwash water to flow into the tank 100 during the preparation process before cleaning the magnetic filter media 105; the pump on the second pipeline 112 is used to allow the water to be filtered to flow into the tank 100 during the filtration stage.

[0052] In other embodiments, such as Figure 3 As shown, the inlet / outlet 103 includes a first inlet / outlet 101, a second inlet / outlet 102 located above the first inlet / outlet 101, and a third outlet 109 located below the first inlet / outlet 101; the first inlet / outlet 101 is used as an outlet during the filtration stage and as an inlet during the backwashing stage; the second inlet / outlet 102 is used as an inlet during the filtration stage; and the third outlet 109 is used as an outlet during the backwashing stage.

[0053] Specifically, the filter device 10 also includes a third pipe 113 connected to the third outlet 109, and a third valve (not shown) is provided on the third pipe 113.

[0054] The magnetic filter media 105 is used to magnetically couple with the drive magnet 121 of the magnetic stirrer host 120 during the backwashing process, so as to act as a stir bar during the backwashing process.

[0055] Moreover, the granular magnetic filter media 105 is not easily broken during rotation, which helps to reduce the wear of the magnetic filter media 105 and correspondingly reduces the probability of the magnetic filter media 105 forming fine powder or debris due to breakage, thereby helping to reduce the risk of the components of the filter device 10 being blocked.

[0056] It should be noted that the volume ratio of the magnetic filter media 105 to the volume of the tank 100 should not be too small or too large. If the volume ratio of the magnetic filter media 105 to the volume of the tank 100 is too small, the volume of the magnetic filter media 105 through which the water to be filtered flows will be small, resulting in poor filtration effect of the filtration device 10. If the volume ratio of the magnetic filter media 105 to the volume of the tank 100 is too large, it will increase the difficulty of rotating the magnetic filter media 105 in the tank 100 and the difficulty of backwashing the surface of the magnetic filter media 105. Therefore, in some embodiments, the volume ratio of the magnetic filter media 105 to the volume of the tank 100 is 75% to 80%. It should also be noted that the diameter of the magnetic filter media 105 ranges from 0.60 mm to 2.36 mm.

[0057] In some embodiments, the magnetic filter material 105 comprises one or both of magnetic activated carbon and magnetic biological activated carbon. The magnetic biological activated carbon is magnetic activated carbon with a microbial community on its surface or in its pores for decomposing organic matter. It should be noted that magnetic activated carbon can be formed by magnetizing activated carbon.

[0058] In other embodiments, the magnetic filter material may also include magnetic zeolite, magnetic silica, or magnetic diatomaceous earth, etc.

[0059] Magnetic activated carbon has a strong adsorption capacity and is widely used. Magnetic biological activated carbon contains microorganisms that decompose organic matter, enabling it to decompose organic matter. Thus, during the filtration stage, magnetic biological activated carbon can not only physically adsorb impurities in water, but also decompose organic matter in water through microorganisms, resulting in better filtration effect.

[0060] As an example, the microbial community includes one or more of the following: β-proteobacteria, α-proteobacteria, and nitrifying bacteria.

[0061] β-Proteobacteria have a better ability to degrade complex compounds, α-Proteobacteria have a better ability to remove phosphorus and nitrogen, and nitrifying bacteria have a better ability to oxidize ammonia nitrogen to nitrite. Therefore, one or more suitable microbial groups can be selected according to actual needs.

[0062] It should be noted that magnetic biological activated carbon can be formed by cultivating microbial communities (such as β-proteobacteria, α-proteobacteria, nitrifying bacteria, etc.) in magnetic activated carbon.

[0063] When the magnetic stirrer host 120 is turned on, the magnetic filter media 105 can be magnetically coupled with the drive magnet 121 of the magnetic stirrer host 120 and rotate in the tank 100 containing backwash water. Under the action of centrifugal force, the backwash water can repeatedly wash the surface of the magnetic filter media 105 and remove contaminants from the surface of the magnetic filter media 105. This is beneficial to improve the desorption rate of contaminants on the magnetic filter media 105 during the backwashing stage, as well as to improve the cleanliness of the magnetic filter media 105 after backwashing. It is also beneficial to reduce the consumption of backwash water, thereby improving the efficiency and effect of backwashing while reducing the consumption of backwash water, and correspondingly, it is also beneficial to extend the service life of the magnetic filter media 105.

[0064] In some embodiments, the magnetic stirrer main unit 120 is disposed on the bottom surface 104 of the tank 100.

[0065] The magnetic stirrer main unit 120 is set on the bottom surface 104 of the tank 100, so that the magnetic stirrer main unit 120 can support the tank 100. The magnetic filter material 105 and the magnetic stirrer main unit 120 can form a stable magnetic coupling, so that the tank 100 is not easy to shake during the rotation of the magnetic filter material 105 in the tank 100, thereby improving the stability of the tank 100 during the backwashing process.

[0066] In other embodiments, the magnetic stirrer unit can also be mounted on the top surface of the tank.

[0067] Understandably, the magnetic stirrer main unit 120 is used to couple with the power supply 140.

[0068] As an example, the inlet / outlet 103 includes a first inlet / outlet 101 located on the top surface of the tank 100 and a second inlet / outlet 102 located on the side wall of the tank 100 and near the bottom of the tank 100. Correspondingly, the magnetic stirrer main unit 120 is disposed on the bottom surface 104 of the tank 100.

[0069] In some embodiments, such as Figure 2 As shown, the magnetic stirrer main unit 120 includes a motor 122, a drive magnet 121 spaced apart from the motor 122, and a motor shaft 123 fixedly connecting the motor 122 and the drive magnet 121. One end of the motor shaft 123 is fixedly connected to the center of one side of the drive magnet 121, and the other end is fixedly connected to the motor 122.

[0070] It should be noted that motor 122 includes DC motors or AC motors.

[0071] In some embodiments, the filtration device 10 further includes a controller 130, which is coupled to the valve 115 and the magnetic stirrer host 120 respectively, so that the controller 130 can control the valve 115 and the magnetic stirrer host 120 respectively, thereby improving the convenience of operating the filtration device 10 in the filtration stage and the backwashing stage. For example, a corresponding program can be written in the controller 130 so that the filtration device 10 performs the operation steps according to the corresponding preset program in both the filtration stage and the backwashing stage.

[0072] It is understandable that when valve 115 includes a first valve 116 and a second valve 117, controller 130 can control the first valve 116 and the second valve 117 respectively.

[0073] Accordingly, the present invention also provides a backwashing method, which is performed using the filtration device of any embodiment of the present invention. Figure 4 This is a flowchart of an embodiment of the backwashing method of the present invention.

[0074] refer to Figure 4 Combined with reference Figures 1 to 3 Step S1: Backwash water flows into the tank 100 of the filter device 10 through the inlet / outlet 103, and the backwash water submerges the magnetic filter media 105.

[0075] The backwash water submerges the magnetic filter media 105 in preparation for sealing the backwash water within the tank 100. Submersion of the magnetic filter media 105 ensures sufficient contact between contaminants on the media and the backwash water, resulting in better removal of contaminants from the surface of the media. Furthermore, it reduces the probability of collisions between the magnetic filter media 105 during rotation, thus minimizing the likelihood of breakage.

[0076] It should be noted that backwash water includes reverse osmosis (RO) concentrate. Using RO concentrate as backwash water improves the utilization rate of RO concentrate and reduces backwashing costs. RO concentrate refers to the concentrated water retained by the semi-permeable membrane during the reverse osmosis process.

[0077] In some embodiments, during the step of allowing backwash water to flow into the tank 100 of the filter device 10, an alkaline solution or an acidic solution is also introduced into the tank 100.

[0078] Alkaline solutions can neutralize acidic organic matter to form easily soluble salts, which then fall off the magnetic filter media 105.

[0079] Acidic solutions can neutralize alkaline organic matter to form easily soluble salts, which then fall off the magnetic filter material 105. Acidic solutions can also dissolve heavy metals, converting them from atomic to ionic states that are soluble in the acidic solution.

[0080] In some embodiments, such as Figure 1 As shown, the inlet / outlet 103 includes a first inlet / outlet 101 and a second inlet / outlet 102 located above the first inlet / outlet 101. The second inlet / outlet 102 serves as an inlet during the filtration stage and an outlet during the backwashing stage. The first inlet / outlet 101 serves as an outlet during the filtration stage and an inlet during the backwashing stage. Accordingly, before allowing backwash water to flow into the tank 100 of the filter device 10 via the inlet / outlet 103, the process further includes closing the second inlet / outlet 102. In the step of allowing backwash water to flow into the tank 100 of the filter device 10 via the inlet / outlet 103, backwash water is also allowed to flow into the tank 100 of the filter device 10 via the first inlet / outlet 101.

[0081] In some embodiments, such as Figure 1 As shown, the inlet / outlet 103 includes a first inlet / outlet 101 and a second inlet / outlet 102 located above the first inlet / outlet 101. The second inlet / outlet 102 serves as an inlet during the filtration stage and an outlet during the backwashing stage. The first inlet / outlet 101 serves as an outlet during the filtration stage and an inlet during the backwashing stage. Accordingly, before allowing backwash water to flow into the tank 100 of the filter device 10 via the inlet / outlet 103, the process further includes closing the second pipeline 112. In the step of allowing backwash water to flow into the tank 100 of the filter device 10 via the inlet / outlet 103, the backwash water flows into the tank 100 of the filter device 10 via the first inlet / outlet 101.

[0082] In some embodiments, the filter device 10 further includes a pipe 110 communicating with the inlet / outlet 103, and a valve 115 is provided on the pipe 110. Accordingly, before allowing backwash water to flow into the tank 100 of the filter device 10, the valve 115 on the pipe 110 is opened. In the step of allowing backwash water to flow into the tank 100 of the filter device 10, backwash water flows into the tank 100 of the filter device 10 via the pipe 110 and the inlet / outlet 103.

[0083] In one specific embodiment, the inlet / outlet 103 includes a first inlet / outlet 101 and a second inlet / outlet 102 located above the first inlet / outlet 101. The second inlet / outlet 102 is used as an inlet during the filtration stage and as an outlet during the backwashing stage. The first inlet / outlet 101 is used as an outlet during the filtration stage and as an inlet during the backwashing stage. The filtration device 10 also includes a pipe 110 connected to the inlet / outlet 103. The pipe 110 includes: a first pipe 111 connected to the first inlet / outlet 101, with a first valve 116 provided on the first pipe 111; and a second pipe 112 connected to the second inlet / outlet 102, with a second valve 117 provided on the second pipe 112. Accordingly, before allowing backwash water to flow into the tank 100 of the filter device 10, the first valve 116 is opened to open the first pipeline 111 and the first inlet / outlet 101, and the second valve 117 is closed to close the second pipeline 112 and the second inlet / outlet 102. In the step of allowing backwash water to flow into the tank 100 of the filter device 10, the backwash water flows into the tank 100 of the filter device 10 via the first pipeline 111 and the first inlet / outlet 101.

[0084] In other embodiments, such as Figure 3 As shown, the inlet / outlet 103 includes a first inlet / outlet 101, a second inlet / outlet 102 located above the first inlet / outlet 101, and a third outlet 109 located below the first inlet / outlet 101. The first inlet / outlet 101 serves as an outlet during the filtration stage and as an inlet during the backwashing stage; the second inlet / outlet 102 serves as an inlet during the filtration stage; and the third outlet 109 serves as an outlet during the backwashing stage. Specifically, the filtration device 10 also includes a third pipe 113 connected to the third outlet 109, and a third valve (not shown) is provided on the third pipe 113. Accordingly, before backwash water flows into the tank 100 of the filtration device 10 via the inlet / outlet 103, the second pipe 112 and the third pipe 113 are closed. In the step of allowing backwash water to flow into the tank 100 of the filter device 10 via the inlet / outlet 103, backwash water is also allowed to flow into the tank 100 of the filter device 10 via the first inlet / outlet 101.

[0085] refer to Figure 3 Combined with reference Figures 1 to 3Step S2: After the backwash water submerges the magnetic filter media 105, the backwash water is sealed inside the tank 100.

[0086] The backwash water is sealed inside the tank 100, providing an operational basis for subsequent cleaning of the magnetic filter media 105.

[0087] In some embodiments, backwash water is allowed to flow into the tank 100 of the filter device 10 via the first inlet / outlet 101, and the second inlet / outlet 102 is closed. Accordingly, the first inlet / outlet 101 is closed to seal the backwash water within the tank 100.

[0088] In some embodiments, backwash water flows into the tank 100 of the filter device 10 via the pipe 110 and the inlet / outlet 103. Accordingly, in the step of sealing the backwash water within the tank 100, the valve 115 is closed to shut off the pipe 110 and the inlet / outlet 103.

[0089] In one specific embodiment, backwash water flows into the tank 100 of the filter device 10 via the first pipeline 111 and the first inlet / outlet 101; correspondingly, in the step of sealing the backwash water in the tank 100, the first valve 116 is closed to shut off the first pipeline 111 and the first inlet / outlet.

[0090] refer to Figure 3 Combined with reference Figures 1 to 3 Step S3: After sealing the backwash water inside the tank 100, turn on the magnetic stirrer main unit 120 to make the granular magnetic filter material 105 rotate inside the tank 100 containing backwash water to clean the magnetic filter material 105.

[0091] After the magnetic stirrer host 120 is turned on, the magnetic filter media 105 can be magnetically coupled with the drive magnet 121 of the magnetic stirrer host 120 and rotate in the tank 100 containing backwash water. Under the action of centrifugal force, the backwash water can repeatedly wash the surface of the magnetic filter media 105 and remove the contaminants on the surface of the magnetic filter media 105. This is beneficial to improve the desorption rate of contaminants on the magnetic filter media 105 during the backwashing stage, as well as to improve the cleanliness of the magnetic filter media 105 after backwashing. It is also beneficial to reduce the consumption of backwash water, thereby improving the efficiency and effect of backwashing while reducing the consumption of backwash water, and correspondingly, it is also beneficial to extend the service life of the magnetic filter media 105.

[0092] It should be noted that the rotation time of the granular magnetic filter media 105 within the tank 100 should not be too short or too long. If the rotation time is too short, the effect of increasing the desorption rate of pollutants on the magnetic filter media 105 will be poor; if the rotation time is too long, the effect of reducing the breakage of the magnetic filter media 105 will be poor. Therefore, in some embodiments, the rotation time of the granular magnetic filter media 105 within the tank 100 is 15 to 20 minutes.

[0093] It should be noted that the rotation speed of the motor 122 of the magnetic stirrer main unit 120 should not be too slow or too fast. If the rotation speed of the motor 122 of the magnetic stirrer main unit 120 is too slow, the effect of improving the desorption rate of pollutants on the magnetic filter media 105 will be poor; if the rotation speed of the motor 122 of the magnetic stirrer main unit 120 is too fast, the effect of reducing the breakage of the magnetic filter media 105 will be poor. Therefore, in some embodiments, the rotation speed of the motor of the magnetic stirrer main unit is 40 rpm to 60 rpm.

[0094] In some embodiments, the step of rotating the granular magnetic filter media 105 within a tank 100 containing backwash water includes: rotating the granular magnetic filter media 105 alternately clockwise and counterclockwise within the tank 100 containing backwash water.

[0095] The granular magnetic filter media 105 is rotated alternately clockwise and counterclockwise in a tank 100 containing backwash water, which helps to further improve the desorption rate of pollutants on the magnetic filter media 105 and further improve the cleanliness of the magnetic filter media after backwashing.

[0096] Specifically, in the step of alternately rotating the granular magnetic filter media 105 clockwise and counterclockwise within the tank 100 containing backwash water, the clockwise rotation time of the granular magnetic filter media within the tank is 7.5 to 10 minutes each time, and the counterclockwise rotation time of the granular magnetic filter media within the tank is 7.5 to 10 minutes each time. The number of alternating clockwise and counterclockwise rotations is 2. This is beneficial for further improving the desorption rate of pollutants on the magnetic filter media 105 and for further improving the cleanliness of the magnetic filter media after backwashing.

[0097] refer to Figure 3 Combined with reference Figures 1 to 3 Step S4: After cleaning the magnetic filter media 105, backwash water is discharged through the inlet and outlet 103.

[0098] The backwash water is discharged to provide an operational basis for subsequent treatment (e.g., filtration).

[0099] In some embodiments, backwash water is discharged through inlet / outlet 103 and discharged into acid-base neutralization tank 150. Acid-base neutralization tank 150 is used to adjust the pH value, and after the pH value of the wastewater in acid-base neutralization tank 150 is in the range of 6-9, the wastewater in acid-base neutralization tank 150 is discharged into the sewage network.

[0100] In some embodiments, the inlet / outlet 103 includes a first inlet / outlet 101 and a second inlet / outlet 102 located above the first inlet / outlet 101; correspondingly, before discharging backwash water through the inlet / outlet 103, the method further includes: opening the second inlet / outlet 102; in the step of discharging backwash water through the inlet / outlet 103, the backwash water is discharged through the second inlet / outlet 102. Specifically, in the step of discharging backwash water through the inlet / outlet 103, cleaning water is also injected into the tank 100 through the first inlet / outlet 101 so that the backwash water overflows from the tank 100 through the second inlet / outlet 102.

[0101] In some embodiments, the filter device 10 further includes a pipe 110 communicating with the inlet and outlet, and a valve 115 is provided on the pipe 110; correspondingly, before discharging backwash water through the inlet and outlet 103, the device further includes: opening the valve 115. In the step of discharging backwash water, the backwash water is discharged through the inlet and outlet 103 and the pipe 110.

[0102] In one specific embodiment, the inlet / outlet 103 includes a first inlet / outlet 101 and a second inlet / outlet 102 located above the first inlet / outlet 101. The second inlet / outlet 102 serves as an inlet during the filtration stage and an outlet during the backwashing stage, while the first inlet / outlet 101 serves as an outlet during the filtration stage and an inlet during the backwashing stage. The filtration device 10 also includes a pipe 110 connected to the inlet / outlet 103. The pipe 110 includes: a first pipe 111 connected to the first inlet / outlet 101, with a first valve 116 installed on the first pipe 111; and a second pipe 112 connected to the second inlet / outlet 102, with a second valve 117 installed on the second pipe 112. Accordingly, before discharging backwash water through the inlet / outlet 103, the second valve 117 is opened. In the step of discharging backwash water, the backwash water is discharged through the second inlet / outlet 102 and the second pipe 112.

[0103] In other embodiments, the inlet and outlet include a first inlet and outlet 101, a second inlet and outlet 102 located above the first inlet and outlet 101, and a third outlet 109 located below the first inlet and outlet 101; correspondingly, during the backwashing process, the backwashing water is discharged through the third inlet and outlet.

[0104] It should be noted that the backwashing method described in the foregoing embodiments can be used to backwash the magnetic filter media 105 once or multiple times. As an example, the backwashing method described in the foregoing embodiments is used to backwash the magnetic filter media 105 twice.

[0105] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A filtration device, characterized in that, include: A tank for containing backwash water during the backwashing stage, the tank being provided with inlet and outlet ports; Granular magnetic filter media is disposed in the tank; A magnetic stirrer main unit is disposed on the outer surface of the tank body, the magnetic stirrer main unit is disposed away from the inlet and outlet water ports, the magnetic stirrer main unit includes a rotatable drive magnet, the drive magnet is used to magnetically couple with the magnetic filter media during the cleaning process of the magnetic filter media, so that the magnetic filter media rotates in the tank body containing backwash water.

2. The filtration device as described in claim 1, characterized in that, The filtration device also includes a pipeline connected to the inlet and outlet, and a valve is provided on the pipeline.

3. The filtration device as described in claim 1, characterized in that, The inlet and outlet include a first inlet and outlet and a second inlet and outlet located above the first inlet and outlet. The second inlet and outlet is used as an inlet during the filtration stage and as an outlet during the backwashing stage. The first inlet and outlet is used as an outlet during the filtration stage and as an inlet during the backwashing stage.

4. The filtration device as described in claim 3, characterized in that, The filtration device further includes pipes connected to the inlet and outlet; the pipes include: The first pipeline is connected to the first inlet and outlet, and the first pipeline is equipped with a first valve. The second pipeline is connected to the second inlet and outlet, and a second valve is installed on the second pipeline.

5. The filtration device as described in claim 2, characterized in that, The filtration device also includes a controller, which is coupled to the valve and the magnetic stirrer main unit, respectively.

6. The filtration device as claimed in claim 1, characterized in that, The magnetic stirrer main unit is located on the bottom surface of the tank.

7. The filtration device as claimed in claim 6, characterized in that, The inlet and outlet include a first inlet and outlet located on the top surface of the tank and a second inlet and outlet located on the side wall of the tank and near the bottom of the tank. The second inlet and outlet is used as an inlet during the filtration stage and as an outlet during the backwashing stage. The first inlet and outlet is used as an outlet during the filtration stage and as an inlet during the backwashing stage. The magnetic stirrer main unit is located on the bottom surface of the tank.

8. The filtration device as claimed in claim 1, characterized in that, The magnetic filter material includes one or two of magnetic activated carbon and magnetic biological activated carbon; The magnetic bio-activated carbon is: magnetic activated carbon with microbial communities on its surface or in its pores that are used to decompose organic matter.

9. The filtration device as claimed in claim 8, characterized in that, The microbial community includes one or more of the following: β-proteobacteria, α-proteobacteria, and nitrifying bacteria.

10. The filtration device as claimed in claim 1, characterized in that, The volume of the magnetic filter media accounts for 75% to 80% of the volume of the tank.

11. The filtration device as claimed in claim 1, characterized in that, The tank body is made of fiberglass.

12. The filtration device as claimed in claim 1, characterized in that, The inlet and outlet include a first inlet and outlet, a second inlet and outlet located above the first inlet and outlet, and a third inlet located below the first inlet and outlet; the first inlet and outlet are used as an outlet during the filtration stage and as an inlet during the backwashing stage; the second inlet and outlet are used as an inlet during the filtration stage. The third inlet / outlet is used as the outlet for the backwashing stage.

13. A backwashing method, characterized in that, The backwashing method, performed using the filtration device as described in any one of claims 1 to 12, comprises: Backwash water flows into the tank of the filter device through the inlet and outlet, and the backwash water submerges the magnetic filter media. After the backwash water submerges the magnetic filter material, the backwash water is sealed inside the tank. After the backwash water is sealed in the tank, the magnetic stirrer is turned on to make the granular magnetic filter material rotate in the tank containing the backwash water to clean the magnetic filter material. After cleaning the magnetic filter media, the backwash water is discharged through the inlet and outlet.

14. The backwashing method as described in claim 13, characterized in that, The granular magnetic filter media rotates in the tank for 15 to 20 minutes, and the rotation speed of the motor of the magnetic stirrer is between 40 and 60 revolutions per minute.

15. The backwashing method as described in claim 13, characterized in that, The step of rotating the granular magnetic filter media in the tank containing the backwash water includes: rotating the granular magnetic filter media alternately clockwise and counterclockwise in the tank containing the backwash water.

16. The backwashing method as described in claim 15, characterized in that, In the step of alternating clockwise and counterclockwise rotation of the granular magnetic filter media in the tank containing the backwash water, the clockwise rotation time of the granular magnetic filter media in the tank is 7.5 to 10 minutes each time, and the counterclockwise rotation time of the granular magnetic filter media in the tank is 7.5 to 10 minutes each time, and the alternating clockwise and counterclockwise rotations are performed twice.

17. The backwashing method as described in claim 13, characterized in that, The inlet and outlet include a first inlet and outlet and a second inlet and outlet located above the first inlet and outlet. The second inlet and outlet is used as an inlet during the filtration stage and as an outlet during the backwashing stage. The first inlet and outlet is used as an outlet during the filtration stage and as an inlet during the backwashing stage. During the process of draining the backwash water, clean water is also injected into the tank through the first inlet and outlet, so that the backwash water overflows from the tank through the second inlet and outlet. or, The inlet and outlet include a first inlet and outlet, a second inlet and outlet located above the first inlet and outlet, and a third inlet located below the first inlet and outlet; the first inlet and outlet is used as an outlet during the filtration stage and as an inlet during the backwashing stage. The second inlet / outlet is used as an inlet during the filtration stage; The third inlet and outlet are used as outlets for the backwashing stage; During the backwash water discharge process, the backwash water is discharged through the third inlet and outlet.

18. The backwashing method as described in claim 13, characterized in that, In the step of allowing backwash water to flow into the tank of the filter device, an alkaline solution or an acidic solution is also introduced into the tank.

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