An immersion membrane filtration device, its cleaning method and usage method

Abstract

This invention proposes an immersion membrane filtration device, its cleaning method, and its usage method, comprising water pipes, membranes, and a partition; the water pipes are spaced apart; several membranes are connected in parallel between two water pipes along the axial direction of the water pipes; the partition is arranged inside the water pipes along the axial direction of the water pipes and divides the interior of the water pipes into a first channel and a second channel; several first interfaces and second interfaces are alternately opened on the outer wall of the water pipes along the axial direction of the water pipes, each first interface connecting to the first channel and each second interface connecting to the second channel; both ends of each membrane are connected to the first interface or the second interface of the two water pipes respectively; two channels are opened in parallel inside the water pipes, and the membranes are alternately connected to the two different channels through different interfaces, so that adjacent membranes on the same water pipe are alternately backwashed, and the membrane fibers in adjacent membranes alternately contract and expand, which can separate the bundled membrane fibers and discharge pollutants.

Description

Technical Field

[0001] This invention relates to the field of ultrafiltration membrane technology, and in particular to an immersion membrane filtration device, its cleaning method, and its usage method. Background Technology

[0002] In the environmental water treatment industry, submersible curtain filtration membranes are used to purify water. A curtain filtration membrane consists of several membrane sheets connected in parallel between two water pipes, forming a curtain-like structure. The submersible filtration membrane is immersed in polluted water; after passing through the membrane, the purified water can be discharged through the water pipes for reuse.

[0003] When a submerged curtain membrane system is in operation, it often has very strict requirements for the quality of the influent water. If there are large changes or fluctuations in the quality of the influent water, or if the water source to be treated is of a quality that exceeds the standard for a long time, it will usually cause rapid fouling of the core filtration components, resulting in low operating efficiency of the water treatment system, or even paralysis of the membrane filtration system. It often takes a lot of time and effort to deal with the fouling problem of the membrane.

[0004] To address the aforementioned issues, Chinese patent CN113101811B discloses a method for restorative cleaning of hollow fiber membranes, employing aeration and backwashing to clean the membrane. Chinese patent CN202124508U discloses a combined submersible cisternives water treatment device that uses a vibrating rod to drive the membrane equipment to vibrate, thereby aiding in the aeration and cleaning of the membrane.

[0005] However, the above methods are difficult to effectively remove membrane fouling. This is because the membrane is composed of several filter filaments bundled together. The filaments are very densely bundled, and in order to ensure the filtration effect, adjacent membranes are also arranged very densely, making it easy for the filaments to clump together with contaminants. This makes it difficult to remove contaminants between the filaments by simply relying on aeration cleaning. At the same time, the method of using a vibrating rod to assist in cleaning the filaments will cause the entire equipment to vibrate, which will cause equipment damage. It is not an ideal membrane cleaning method either. Summary of the Invention

[0006] In view of this, the present invention proposes an immersion membrane filtration device, a cleaning method thereof, and a method of use thereof, to solve the problem that existing cleaning methods are difficult to effectively clean membranes.

[0007] The technical solution of the present invention is implemented as follows: The present invention provides an immersion membrane filtration device, including at least two water pipes, spaced apart; a plurality of membranes, connected in parallel between the two water pipes along the axial direction of the water pipes; a partition; wherein the partition is arranged inside the water pipes along the axial direction of the water pipes and divides the interior of the water pipes into a first channel and a second channel, and a plurality of first interfaces and second interfaces are alternately opened on the outer wall of the water pipes along the axial direction of the water pipes, each first interface being connected to the first channel and each second interface being connected to the second channel; both ends of each membrane are respectively connected to the first interface of the two water pipes or the second interface of the two water pipes.

[0008] Based on the above technical solutions, the preferred embodiment also includes a frame; a first pump body; and a second pump body; wherein, a number of pairs of water pipes are evenly distributed along a straight line on the frame; and both the first pump body and the second pump body are simultaneously connected to the number of water pipes.

[0009] Even more preferably, the extension direction of the diaphragm is perpendicular to the laying direction of the several pairs of water pipes.

[0010] In a further preferred embodiment, a first cavity and a second cavity are formed within the frame. The first cavity is connected to the first pump body, and the second cavity is connected to the second pump body. Several first and second connecting pipes are provided on the frame. The first connecting pipes are connected to the first cavity, and the second connecting pipes are connected to the second cavity. A first connector and a second connector are provided at either end of the water pipe. Each first connector is connected to the first connecting pipe, and each second connector is connected to the second connecting pipe.

[0011] More preferably, the first channel of one pair of water pipes in two adjacent pairs of water pipes is simultaneously connected to the first pump body along with the second channel of the other pair of water pipes, and the second channel of one pair of water pipes in two adjacent pairs of water pipes is simultaneously connected to the second pump body along with the first channel of the other pair of water pipes.

[0012] More preferably, it also includes a first branch and a second branch, connecting the first pump body to a plurality of water pipes; a third branch and a fourth branch, connecting the second pump body to a plurality of water pipes; wherein, one end of the first branch and one end of the second branch are respectively connected to both ends of each water pipe and connected to the first channel or the second channel, and the other end of the first branch and the other end of the second branch are simultaneously connected to the first pump body, and valves are respectively installed on the first branch and the second branch; one end of the third branch and one end of the fourth branch are respectively connected to both ends of each water pipe and connected to the remaining first channel or the second channel, and the other end of the third branch and the other end of the fourth branch are simultaneously connected to the second pump body, and valves are respectively installed on the third branch and the fourth branch.

[0013] A further preferred embodiment includes a water storage tank for storing purified water; wherein a first pump body and a second pump body are installed in the water storage tank.

[0014] Secondly, the present invention also provides a cleaning method for an immersion membrane filtration device, wherein the membrane filtration device described above is used to draw water outward from the first channel while simultaneously supplying water into the second channel and backwashing the membrane; or, water is drawn outward from the second channel while simultaneously supplying water into the first channel and backwashing the membrane.

[0015] Thirdly, the present invention also provides a cleaning method for an immersion membrane filtration device, which includes the following steps: Step 1, water is pumped outward from the first channel by a first pump body, while water is pumped into the second channel by a second pump body to backwash the membrane; Step 2, water is pumped outward from the second channel by the second pump body, while water is pumped into the first channel by the first pump body to backwash the membrane; Step 3, Step 1 and Step 2 are repeated alternately.

[0016] Fourthly, the present invention also provides a method for using an immersion membrane filtration device. The method includes the following steps: Step 1, setting the frame inside a wastewater tank, simultaneously opening the valves of the first and third branches, and starting the first and second pumps to purify the water in the wastewater tank and transport it to a storage tank; Step 2, closing the valve of the third branch and opening the valve of the fourth branch, reversing the second pump to pump water from the storage tank into the second channel and backwash the membrane; Step 3, closing the valves of the first and fourth branches and opening the valves of the second and third branches, pumping water from the second channel outwards to the storage tank via the second pump, reversing the first pump to pump water from the storage tank into the first channel and backwash the membrane; Step 4, alternately repeating steps 2 and 3 until the membrane is clean, then repeating step 1.

[0017] The immersion membrane filtration device, its cleaning method, and its usage method of the present invention have the following advantages over the prior art:

[0018] This invention opens two parallel channels in the water pipe and allows the membrane to alternately connect to the two different channels through different interfaces. This allows adjacent membranes on the same water pipe to be backwashed alternately, and the membrane fibers in adjacent membranes to alternately contract and expand. This enables the bundled membrane fibers to separate and discharge contaminants, effectively cleaning the membrane. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a perspective view of the membrane filtration device of the present invention;

[0021] Figure 2 This is a schematic diagram of the diaphragm and water pipe of the present invention;

[0022] Figure 3 This is a schematic cross-sectional view of the water pipe of the present invention;

[0023] Figure 4 This is a partial top-sectional schematic diagram of the membrane filtration device of the present invention;

[0024] Figure 5 This is a schematic diagram of the membrane filtration device of the present invention in a connected state.

[0025] In the diagram: 1. Water pipe; 11. First connector; 12. Second connector; 101. First channel; 102. Second channel; 103. First interface; 104. Second interface; 2. Diaphragm; 3. Partition; 4. Frame; 41. First connecting pipe; 42. Second connecting pipe; 401. First cavity; 402. Second cavity; 5. First pump body; 6. Second pump body; 7. Water storage tank; 100. First branch; 200. Second branch; 300. Third branch; 400. Fourth branch. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1:

[0028] like Figure 1 As shown, combined with Figure 2 and Figure 3 The present invention provides an immersion membrane filtration device, comprising a water pipe 1, a membrane 2, a partition 3, and a frame 4.

[0029] The frame 4 is typically assembled from several metal pipes. Its purpose is to house the water pipes 1 and membranes 2 within the frame 4, which is then placed inside the water tank. The membrane filtration unit, consisting of two water pipes 1 connected in parallel with several membranes 2, performs the filtration function. The filtration principle of the membrane filtration device is that water in the tank, after being filtered by the membranes 2, enters the water pipes 1 and is then transported to another clean water tank, thus purifying the water in the wastewater tank. In practical implementation, due to the large number of membrane filtration units, it is impractical to independently connect each water pipe 1 to another water tank. Therefore, the frame 4 can be composed of several hollow pipes, forming a transport channel within the frame 4. Inlet and outlet ports are then installed on the frame 4 to uniformly transport the water filtered by the membranes 2 to the clean water tank.

[0030] At least two water pipes 1 are spaced apart on the frame 4, with the two water pipes 1 installed on the upper and lower parts of the frame 4 respectively.

[0031] Several membranes 2 are connected in parallel between two water pipes 1 along the axial direction of the water pipe 1, so that the membranes 2 are set vertically, that is, the extension direction of the membranes 2 is perpendicular to the arrangement direction of the several pairs of water pipes 1, thereby making the contact cross-sectional area between the membranes 2 and the water flow surface larger, so as to ensure the filtration effect.

[0032] A partition 3 is installed axially inside the water pipe 1 and divides the interior of the water pipe 1 into a first channel 101 and a second channel 102. Several first interfaces 103 and second interfaces 104 are alternately opened on the outer wall of the water pipe 1 along the axial direction of the water pipe 1. Each first interface 103 is connected to the first channel 101, and each second interface 104 is connected to the second channel 102. At the same time, both ends of each membrane 2 are connected to the first interfaces 103 or the second interfaces 104 of the two water pipes 1, so that two adjacent membranes 2 in each membrane filtration unit are connected to different channels in the water pipe 1. The advantage of this is that when cleaning the membranes 2, two adjacent membranes 2 can be backwashed alternately, so that the membrane fibers in the adjacent membranes 2 can be contracted and expanded alternately, which can separate the bundled membrane fibers and discharge pollutants, effectively cleaning the membranes 2.

[0033] At the same time, it can be regarded as two parallel water pipe systems within the same membrane filtration unit, so the purification of wastewater and the cleaning of membrane 2 can be carried out simultaneously.

[0034] Example 2:

[0035] Based on Embodiment 1, in order to simultaneously purify wastewater and clean the membrane 2, a first pump body 5, a second pump body 6, and a water storage tank 7 are also included.

[0036] Both the first pump body 5 and the second pump body 6 are connected to several water pipes 1. The first pump body 5 and the second pump body 6 can simultaneously pump water outward for sewage purification, or they can alternately reverse to backwash the membrane 2.

[0037] The water storage tank 7 is equipped with a first pump body 5 and a second pump body 6. The water storage tank 7 is used to store the purified water pumped out by the first pump body 5 and the second pump body 6, and at the same time, the water storage tank 7 can also serve as a water source for backwashing.

[0038] Example 3:

[0039] Based on Embodiment 2, the first channel 101 of one pair of water pipes 1 and the second channel 102 of the other pair of water pipes 1 are simultaneously connected to the first pump body 5, and the second channel 102 of one pair of water pipes 1 and the first channel 101 of the other pair of water pipes 1 are simultaneously connected to the second pump body 6. This allows the backwashing sequence of the membrane sheets 2 in adjacent membrane filtration units to be staggered, so that the backwashing sequence of any two adjacent membrane sheets 2 in the horizontal and vertical matrix arrangement can be alternated.

[0040] Example 4:

[0041] Based on Example 2, in order to achieve unified water supply or drainage through frame 4, such as Figure 1 As shown, combined with Figure 4 A first cavity 401 and a second cavity 402 are opened in the frame 4. The first cavity 401 is connected to the first pump body 5, and the second cavity 402 is connected to the second pump body 6. Several first pipes 41 and second pipes 42 are provided on the frame 4. The first pipes 41 are connected to the first cavity 401, and the second pipes 42 are connected to the second cavity 402.

[0042] Each end of the water pipe 1 is provided with a first connector 11 and a second connector 12. Each first connector 11 is connected to the first connecting pipe 41, and each second connector 12 is connected to the second connecting pipe 42.

[0043] Example 5:

[0044] Based on Example 3, when specifically arranging the water channels for each diaphragm 2, such as... Figure 1 As shown, combined with Figure 5 It also includes the first branch road 100, the second branch road 200, the third branch road 300 and the fourth branch road 400.

[0045] The first branch 100 and the second branch 200 are connected between the first pump body 5 and several water pipes 1. One end of the first branch 100 and one end of the second branch 200 are respectively connected to the two ends of each water pipe 1 and connected to the first channel 101 or the second channel 102. The other end of the first branch 100 and the other end of the second branch 200 are simultaneously connected to the first pump body 5. Valves are respectively installed on the first branch 100 and the second branch 200.

[0046] The third branch 300 and the fourth branch 400 connect the second pump body 6 to several water pipes 1. One end of the third branch 300 and one end of the fourth branch 400 are respectively connected to the two ends of each water pipe 1 and connected to the remaining first channel 101 or second channel 102. The other ends of the third branch 300 and the fourth branch 400 are simultaneously connected to the second pump body 6. Valves are respectively installed on the third branch 300 and the fourth branch 400.

[0047] Example 6:

[0048] The present invention provides a cleaning method for an immersion membrane filtration device, which uses the membrane filtration device of Embodiment 1, wherein water is drawn out from the first channel 101 and water is simultaneously supplied into the second channel 102 to backwash the membrane 2; or, water is drawn out from the second channel 102 and water is simultaneously supplied into the first channel 101 to backwash the membrane 2.

[0049] Example 7:

[0050] A cleaning method for an immersion membrane filtration device according to the present invention, using the membrane filtration device of Example 2, includes the following steps:

[0051] Step 1: Water is pumped outward from the first channel 101 through the first pump body 5, while water is simultaneously pumped into the second channel 102 through the second pump body 6 to backwash the diaphragm 2.

[0052] Step two: Water is pumped outward from the second channel 102 through the second pump body 6, while water is simultaneously pumped into the first channel 101 through the first pump body 5 to backwash the diaphragm 2.

[0053] Step 3: Repeat Step 1 and Step 2 alternately.

[0054] Example 8:

[0055] The present invention discloses a method for using an immersion membrane filtration device, employing the membrane filtration device of Example 5, comprising the following steps.

[0056] Step 1: Set frame 4 inside the sewage tank, and simultaneously open the valves of the first branch 100 and the third branch 300. Start the first pump body 5 and the second pump body 6 to purify the water in the sewage tank and transport it to the water storage tank 7, thereby purifying the sewage.

[0057] Step 2: Close the valve of the third branch 300 and open the valve of the fourth branch 400. Reverse the second pump body 6 to pump water from the water storage tank 7 into the second channel 102 and backwash the diaphragm 2.

[0058] Step 3: Close the valves of the first branch 100 and the fourth branch 400 and open the valves of the second branch 200 and the third branch 300. Pump water from the second channel 102 to the water storage tank 7 through the second pump body 6. Reverse the first pump body 5 to pump water from the water storage tank 7 into the first channel 101 and backwash the diaphragm 2.

[0059] Step 4: Alternately repeat steps 2 and 3 until membrane 2 is clean, then repeat step 1.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An immersed membrane filtration device, characterized by, The application relates to a water pipe system, which comprises: at least two water pipes (1) arranged at intervals; a plurality of diaphragms (2) arranged in parallel along the axial direction of the water pipes (1) and between the two water pipes (1); a partition plate (3); wherein the partition plate (3) is arranged in the axial direction of the water pipes (1) and separates the water pipes (1) into a first channel (101) and a second channel (102), a plurality of first interfaces (103) and second interfaces (104) are alternately arranged on the outer wall of the water pipes (1) in the axial direction of the water pipes (1), each first interface (103) is connected to the first channel (101), and each second interface (104) is connected to the second channel (102); the two ends of each diaphragm (2) are connected to the first interfaces (103) of the two water pipes (1) or the second interfaces (104) of the two water pipes (1).

2. The submerged membrane filtration apparatus of claim 1, wherein, The application further comprises: a frame (4); a first pump body (5); a second pump body (6); wherein a plurality of pairs of water pipes (1) are uniformly arranged on the frame (4) in a straight line direction; the first pump body (5) and the second pump body (6) are connected to the plurality of water pipes (1) at the same time.

3. The submerged membrane filtration apparatus of claim 2, wherein: The extension direction of the diaphragm (2) is perpendicular to the arrangement direction of the plurality of pairs of water pipes (1).

4. The submerged membrane filtration apparatus of claim 2, wherein: first and second cavities (401 and 402) are arranged in the frame (4), the first cavity (401) is connected to the first pump body (5), the second cavity (402) is connected to the second pump body (6), a plurality of first and second connecting pipes (41 and 42) are arranged on the frame (4), the first connecting pipe (41) is connected to the first cavity (401), and the second connecting pipe (42) is connected to the second cavity (402); first and second connectors (11 and 12) are arranged on any one end of the water pipe (1), each first connector (11) is connected to the first connecting pipe (41) in one-to-one correspondence, and each second connector (12) is connected to the second connecting pipe (42) in one-to-one correspondence.

5. The submerged membrane filtration apparatus of claim 2, wherein: The first channel (101) of one pair of water pipes (1) in the adjacent two pairs of water pipes (1) is connected to the first pump body (5) at the same time as the second channel (102) of the other pair of water pipes (1), and the second channel (102) of one pair of water pipes (1) in the adjacent two pairs of water pipes (1) is connected to the second pump body (6) at the same time as the first channel (101) of the other pair of water pipes (1).

6. The submerged membrane filtration apparatus of claim 5, wherein, The application further comprises: a first branch (100) and a second branch (200) connected between the first pump body (5) and the plurality of water pipes (1); a third branch (300) and a fourth branch (400) connected between the second pump body (6) and the plurality of water pipes (1). Wherein, one end of the first branch (100) and one end of the second branch (200) are connected to both ends of each water pipe (1) and communicate with the first channel (101) or the second channel (102), the other end of the first branch (100) and the other end of the second branch (200) simultaneously communicate with the first pump body (5), and valves are respectively arranged on the first branch (100) and the second branch (200); One end of the third branch (300) and one end of the fourth branch (400) are connected to both ends of each water pipe (1) and communicate with the remaining first channel (101) or second channel (102), the other end of the third branch (300) and the other end of the fourth branch (400) simultaneously communicate with the second pump body (6), and valves are respectively arranged on the third branch (300) and the fourth branch (400).

7. An immersed membrane filtration device according to claim 6, wherein, Further comprising: A water storage tank (7) for storing purified water; Wherein, the first pump body (5) and the second pump body (6) are arranged in the water storage tank (7).

8. A cleaning method of a submerged membrane filtration device using the membrane filtration device according to claim 1, characterized by: Water is pumped out from the first channel (101) while water is pumped into the second channel (102) and the membrane (2) is backwashed; or water is pumped out from the second channel (102) while water is pumped into the first channel (101) and the membrane (2) is backwashed.

9. A cleaning method of a submerged membrane filtration device using the membrane filtration device according to claim 5, characterized by: The steps include, Step one, water is pumped out from the first channel (101) by the first pump body (5) while water is pumped into the second channel (102) by the second pump body (6) and the membrane (2) is backwashed; Step two, water is pumped out from the second channel (102) by the second pump body (6) while water is pumped into the first channel (101) by the first pump body (5) and the membrane (2) is backwashed; Step three, steps one and two are alternately repeated.

10. A method of using a submerged membrane filtration device, using the membrane filtration device of claim 7, characterized by: The steps include, Step one, the frame (4) is arranged in the sewage tank, the valves of the first branch (100) and the third branch (300) are opened, and the first pump body (5) and the second pump body (6) are started to purify the water in the sewage tank and then deliver it to the water storage tank (7); Step two, the valve of the third branch (300) is closed and the valve of the fourth branch (400) is opened, the second pump body (6) is reversed to pump water from the water storage tank (7) into the second channel (102) and backwash the membrane (2); Step three, the valves of the first branch (100) and the fourth branch (400) are closed and the valves of the second branch (200) and the third branch (300) are opened, the second pump body (6) is used to pump water out from the second channel (102) to the water storage tank (7), and the first pump body (5) is reversed to pump water from the water storage tank (7) into the first channel (101) and backwash the membrane (2); Step four, steps two and three are alternately repeated until the membrane (2) is cleaned and step one is repeated.

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