A high anti-pollution submerged ultrafiltration device

Abstract

The present invention discloses a highly anti-pollution immersed ultrafiltration device, which comprises a membrane rack. An air inlet flange and a water production port flange are arranged on the upper part of the membrane rack, and a plurality of aeration pipes are arranged at the bottom. A plurality of curtain-type membrane modules are arranged directly above the aeration pipes. The curtain-type membrane module comprises a plurality of membrane sheets. The upper ends of the plurality of membrane sheets are encapsulated in a membrane shell, and a fixing shell is arranged at the lower end of each membrane sheet. A through hole is arranged in the fixing shell, and the plurality of through holes are connected by a fixing rod, and the fixing rod is detachably connected to the membrane rack after passing through the through hole. There is a certain gap between the lower ends of the membrane sheets of the immersed ultrafiltration device, and impurities such as sludge are not easily deposited at the root of the membrane filaments. When the membrane module is caked, only the fixing rod needs to be withdrawn from the curtain-type membrane module, and the lower end of the membrane module will spread out by itself without removing the whole membrane module, and the device is convenient to disassemble and assemble, improving the cleaning efficiency.

Description

Technical Field

[0001] The present invention relates to the field of water treatment devices, and particularly to a highly anti-pollution submerged ultrafiltration device. Background Art

[0002] Submerged ultrafiltration means that a membrane device containing a membrane module is directly immersed in a membrane tank, and a certain transmembrane pressure difference is generated by vacuum pumping the membrane module through a suction pump. Sewage enters the inner surface from the outer surface of the hollow fiber membrane filaments (hereinafter referred to as membrane filaments) to form the filtration method of produced water. Currently, the widely used submerged ultrafiltration devices include curtain-type submerged ultrafiltration devices and cylindrical submerged ultrafiltration devices. The curtain-type submerged ultrafiltration device consists of a curtain-type membrane module and a membrane rack. Among them, the curtain-type membrane module uses a certain number of membrane filaments fixed at both ends by casting glue inside the membrane shell to form a curtain-type membrane module. The packing density of the membrane filaments inside the membrane shell is large, usually up to 300 - 1200m 2 / m 3 (square meters per cubic meter). At a high packing density, and the roots of the membrane filaments are fixed together by potting glue, there are no gaps between the membrane filaments, and it is easy to generate mud accumulation at the roots of the membrane filaments, and once the mud accumulation is formed, it is very difficult to remove. In addition, during the use and cleaning of the submerged ultrafiltration device, due to inaccurate control of the water treatment process or sudden increase in the incoming water, the treated water volume suddenly increases. At this time, impurities such as sludge are prone to form hardening on the surface and roots of the membrane filaments.

[0003] Once a large amount of sludge flocs are deposited on the surface of the membrane filaments to form filter cake hardening, the system is basically unable to operate normally. Usually, aeration and backwashing are not easy to remove the impurities inside the curtain-type membrane module and the hardened ones, and only the curtain-type membrane module can be removed from the membrane rack for flushing. The traditional curtain-type submerged ultrafiltration device fixes the membrane module after sealing and casting at both ends on the membrane rack. It is necessary to remove each membrane module from the membrane rack. The disassembly and assembly of the membrane module are relatively cumbersome, time-consuming and laborious, with a large project volume, seriously affecting the cleaning efficiency. Moreover, improper treatment of the flushing and cleaning wastewater is likely to cause secondary pollution. Summary of the Invention

[0004] The purpose of the present invention is to provide a highly anti-pollution submerged ultrafiltration device, which solves the problems that the submerged ultrafiltration membrane is easily polluted during use in the prior art and needs to remove the curtain-type membrane module from the membrane rack for flushing after being polluted, with cumbersome disassembly and assembly, large project volume and low efficiency.

[0005] Another purpose of the present invention is to provide a highly anti-pollution submerged ultrafiltration device, which can solve the phenomenon of filament breakage or even glue detachment caused by the stretching or contraction of the membrane filaments, improve the working stability of the membrane module and extend its service life.

[0006] To achieve the above object, the present invention provides the following technical solutions: A highly anti-pollution submerged ultrafiltration device, comprising: a membrane rack, an air inlet and a water production port are provided on the upper part of the membrane rack, and are respectively connected to an air inlet pipe and a water production pipe through an air inlet flange and a water production port flange for water production and air washing. A plurality of aeration pipes are provided at the bottom, and the aeration pipes are connected to a gas source to provide aeration for the device; a plurality of curtain-type membrane modules are provided directly above the aeration pipes, the curtain-type membrane module includes a plurality of membrane sheets, the upper ends of the plurality of membrane sheets are encapsulated inside the membrane shell, and a fixing shell is provided at the lower end of each membrane sheet, and the lower end of the membrane sheet is embedded and fixed inside the fixing shell, and the entire curtain-type membrane module is spread out in an umbrella shape, and through holes are provided in the fixing shells;

[0007] It further includes: a fixing rod, the fixing rod passes through a plurality of through holes and is detachably connected to the membrane rack.

[0008] As an improvement of the above technical solution, a limiting block is provided on the fixing shell, and the height of the limiting block in the direction perpendicular to the membrane shell is 0.1-10 cm, and the limiting block is located on the side of the fixing shell.

[0009] As an improvement of the above technical solution, the membrane sheet comprises 1-10 layers of hollow fiber membrane filaments arranged in a straight line, preferably, the number of membrane sheet layers is 1-5 layers.

[0010] As an improvement of the above technical solution, the number of the limiting blocks is 1-10.

[0011] As an improvement of the above technical solution, a groove is provided on the fixing rod.

[0012] As an improvement of the above technical solution, the width of the groove is greater than or equal to the thickness when the fixing shells at the lower ends of one membrane module are closely aggregated together, the number of grooves is the same as the number of curtain-type membrane modules in the submerged device, and the number of grooves corresponds one-to-one with the number of curtain-type membrane modules.

[0013] As an improvement of the above technical solution, the width of the groove is the same as the thickness of the fixing shell, the number of grooves is the same as the number of membrane sheets in the submerged device, and the number of grooves corresponds one-to-one with the number of membrane sheets.

[0014] As an improvement of the above technical solution, the depth of the groove is 0.1-10 cm.

[0015] As an improvement of the above technical solution, among the cross beams parallel to the aeration pipes at the bottom of the membrane rack, a rod support is provided on one cross beam, and a fixing block is provided on the other cross beam, and the rod support and the fixing block are fixedly connected to the cross beam.

[0016] As an improvement of the above technical solution, the aeration pipe is provided with aeration holes and sludge discharge holes, the orientation of the aeration holes is vertically upward, and the orientation of the sludge discharge holes is vertically downward.

[0017] As an improvement of the above technical solution, the fixing block is provided with a through hole and a limit bolt for detachably and fixedly connecting the fixing rod to the membrane frame.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. The present invention provides a highly anti-pollution submerged ultrafiltration device. It adopts a curtain-type membrane module with the upper end encapsulated in the membrane shell and the lower end open. It is fixedly connected to the membrane frame through a fixing rod, replacing the traditional membrane module in which both ends of several membrane filaments are respectively encapsulated in the membrane shell and then installed on the membrane frame separately. This device is convenient for disassembly and assembly. When the curtain-type membrane module becomes caked, only need to pull out the fixing rod from the through hole of the curtain-type membrane module, and the lower end of the membrane module will naturally disperse, without having to remove the entire membrane module, which is convenient for cleaning.

[0020] 2. For the highly anti-pollution submerged ultrafiltration device provided by the present invention, a fixing shell is provided at the lower end of each membrane sheet in the curtain-type membrane module. The fixing shell is provided with a limit block or the membrane sheets are equally spaced by using a fixing rod slotting method, and there is a certain gap between the membrane sheets. Sludge and other impurities can freely fall from the gap and are not easily deposited at the root of the membrane filaments.

[0021] 3. For the highly anti-pollution submerged ultrafiltration device provided by the present invention, the aeration pipe is located directly below the curtain-type membrane module. The bubbles generated by aeration can rise along the gaps between the membrane sheets, enhancing the turbulence of the sewage between the membrane sheets, making the sewage concentration more uniform, and sludge and other impurities are not easily caked on the surface of the membrane filaments, and the aeration cleaning efficiency is higher.

[0022] 4. For the highly anti-pollution submerged ultrafiltration device provided by the present invention, the membrane sheet can move up and down within a certain range in the groove of the fixing rod, increasing the shaking effect of the membrane module and improving the cleaning efficiency. At the same time, it can avoid the probability of filament breakage caused by the stretching or contraction of the membrane filaments, improve the working stability of the membrane module, and extend its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the highly anti-pollution submerged ultrafiltration device of the present invention;

[0024] Figure 2 is Figure 1 a partial enlarged structural diagram at A in

[0025] Figure 3 is a schematic cross-sectional structure diagram of the aeration pipe;

[0026] Figure 4 is a schematic structural diagram of the highly anti-pollution submerged ultrafiltration device of the present invention from another angle;

[0027] Figure 5 is a schematic left view structural diagram of the highly anti-pollution submerged ultrafiltration device of the present invention;

[0028] Figure 6 is Figure 5 A sectional view along the arrow direction at position B in

[0029] Figure 7 is Figure 6 A partially enlarged structural schematic diagram at position C in

[0030] Figure 8 is a structural schematic diagram of a curtain - type membrane module with a dispersed lower end in Example 1;

[0031] Figure 9 is Figure 8 A partially enlarged structural schematic diagram at position D in

[0032] Figure 10 is a structural schematic diagram of a curtain - type membrane module with a dispersed lower end in Example 2;

[0033] Figure 11 is an assembly schematic diagram of the fixing rod and the fixing shell of the curtain - type membrane module in Example 2;

[0034] Figure 12 is a front - view schematic diagram of the fixing rod in one embodiment.

[0035] In the figure: 1, membrane frame; 2, curtain - type membrane module; 3, air - inlet flange; 4, water - production outlet flange; 5, fixing block; 6, fixing rod; 7, aeration pipe; 8, rod support; 9, limit bolt; 10, membrane sheet; 11, limit block; 12, fixing shell; 13, groove; 14, aeration hole; 15, membrane shell; 16, through - hole; 17, sludge - discharge hole. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0037] Please refer to Figure 1-7 The present invention provides a highly anti - fouling submerged ultra - filtration device, including: a membrane frame 1, the membrane frame includes membrane - frame support columns and membrane - frame cross - beams that form a cuboid frame structure; an air inlet and a water production outlet are provided at the upper part of the membrane frame 1, and are respectively connected to an air inlet pipe and a water production pipe through an air - inlet flange 3 and a water - production outlet flange 4 for water production and air scouring. A plurality of aeration pipes 7 are provided at the bottom of the membrane frame 1, and the aeration pipes 7 are connected to an air hose to provide a gas source for the device of the present invention; a plurality of curtain - type membrane modules 2 are provided above the aeration pipes 7; the curtain - type membrane module 2 includes a plurality of membrane sheets 10, the upper ends of the plurality of membrane sheets 10 are encapsulated in a membrane shell 15, and fixing shells 12 are provided at the lower ends. The lower ends of the membrane sheets are embedded inside the fixing shells 12 and are sealed and fixed by potting glue. The entire curtain - type membrane module is in a state where the upper - end membrane sheets are tightly glued together and the lower ends are freely dispersed.

[0038] The membrane shell 15 includes an inner groove and a water collecting pipe. The membrane filaments pass through the inner groove and are connected to the water collecting pipe. A water outlet is provided at one end or both ends of the water collecting pipe and is connected to the water outlet of the membrane frame 1. A through hole 16 is provided in the fixed shell 12. A fixing rod 6 is provided in the through hole 16, and the fixing rod 6 passes through the through hole 16. The number of the through holes 16 is 1-5, and the number of the fixing rods 6 is the same as the number of the through holes 16. The fixing rod 6 connects different diaphragms 10 together through the through holes 16.

[0039] Furthermore, the material of the fixing rod 6 is one or more of ABS plastic, PVC plastic, and stainless steel; the material of the fixing shell 12 is ABS plastic, PVC plastic, and other plastics with a certain hardness.

[0040] See also Figure 2 and Figure 3 Furthermore, the aeration tube 7 is located directly below the curtain membrane assembly 2. Aeration holes 14 and sludge discharge holes 17 are axially arranged on the aeration tube 7. The aeration holes 14 face vertically upward, allowing aerated bubbles to rise directly along the gaps between the membrane sheets 10, driving turbulent flow of sewage between the membrane sheets 10. This results in a more uniform sewage concentration between the membrane sheets 10 and prevents impurities such as sludge from forming on the membrane filament surfaces. The sludge discharge holes 17 face vertically downward, allowing the highly concentrated sewage and sludge in the aeration tube to be discharged when aeration is stopped.

[0041] See also Figure 8 and Figure 10 : Further, the membrane sheet 10 comprises 1-10 layers of hollow fiber membrane filaments (hereinafter referred to as membrane filaments) arranged in a straight line, the root of one end of the membrane filament is encapsulated in the inner groove of the membrane shell 15 with a potting compound, and the other end is fixed by a fixing shell 12. Preferably, when the membrane sheet 10 comprises 1-5 layers of hollow fiber membrane filaments arranged in a straight line.

[0042] See also Figure 1 and Figure 4 : Furthermore, there are two crossbeams parallel to the aeration pipe 7 at the bottom of the membrane frame 1, among which a rod support 8 is provided on one crossbeam, and the rod support 8 is a fixed block with a blind hole; a fixed block 5 is provided on the other crossbeam, and the fixed block 5 includes a baffle with a through hole and a positioning plate perpendicular to the baffle, and the positioning plate is provided with a threaded hole, and the rod support 8 and the fixed block 5 are fixedly connected to the crossbeam by welding or the like.

[0043] This solution is different from the traditional curtain-type immersed ultrafiltration device in that it adopts a curtain membrane assembly with the upper end encapsulated in the membrane shell and the lower end open. The lower ends of several diaphragms 10 in the membrane assembly are connected by a fixing rod 6, replacing the traditional curtain membrane assembly with both ends encapsulated in the membrane shell 15. When the curtain membrane assembly is compacted, it is only necessary to remove the fixing rod 6 from the through hole 16 of the curtain membrane assembly, and the lower end of the curtain membrane assembly will be freely dispersed. There is no need to remove the entire curtain membrane assembly, which is convenient for cleaning.

[0044] Example 1:

[0045] The fixed rod 6 is a smooth rod with a through hole at one end. The fixed rod 6 passes through the through holes of several fixed shells and is detachably fixed to the rod support 8 and the fixed block 5 of the membrane frame. The cross-sectional shape of the fixed rod 6 is the same as that of the through hole 16 and is 10 - 30% smaller than the cross-section of the through hole 16. At this time, the membrane sheet 10 of the curtain-type membrane module can slide left and right and move up and down within a certain range on the fixed rod 6, increasing the jitter of the membrane module, and impurities such as sludge are not easily deposited at the roots of the membrane filaments.

[0046] Example 2:

[0047] Please refer to Figure 1-9 : Preferably, one side or both sides of the fixed shell 12 are provided with limit blocks 11. The number of the limit blocks 11 is 1 - 10. More preferably, there is a limit block 11 on one side of the fixed shell 12, and the number of the limit blocks 11 is 3, which is used to evenly distribute the membrane sheets 10 and leave a certain gap between different membrane sheets. The height of the limit block in the direction perpendicular to the fixed shell 12 is 0.1 - 10 cm.

[0048] Please refer to Figure 11 : Preferably, the fixed rod 6 is provided with grooves 13. The number of the grooves 13 is the same as the number of curtain-type membrane modules in the device of the present invention. The width of the grooves 13 can be equal to the width of the lower ends of the membrane sheets 10 in each curtain-type membrane module tightly joined together, ensuring that the membrane sheets 10 at the lower end of the membrane module can be stuck in the grooves 13 of the fixed rod. It can also be greater than the width of the lower ends of the membrane sheets 10 in each curtain-type membrane module tightly joined together. At this time, the membrane sheets can slide left and right within a certain range in the grooves. Here, the width of the grooves is the length in the direction parallel to the axis of the fixed rod.

[0049] The depth of the grooves 13 is 0.1 - 10 cm, ensuring that the fixed shell 12 can be stuck in the grooves 13 and can move up and down within a certain range in the grooves 13, increasing the jitter of the curtain-type membrane module, which is more conducive to the aeration cleaning of the curtain-type membrane module. At the same time, it can prevent the membrane filaments from breaking due to stretching or contraction. Here, the width of the grooves is the length in the direction perpendicular to the axis of the fixed rod.

[0050] One end of the fixed rod 6 is provided with a through hole for fixing with the limit bolt 9 on the fixed block 5.

[0051] Example 3:

[0052] Please refer to Figure 10 and Figure 11:The differences between the third embodiment and the second embodiment mainly lie in that in the second embodiment, a limiting block 11 is provided on the fixed shell 12 to limit each diaphragm 10 at equal intervals, while in the third embodiment, no limiting block is provided on the fixed shell 12. Instead, a groove 13 with the same number as the diaphragm 10 in the curtain membrane module is provided on the fixed rod for limiting. The groove 13 on the fixed rod corresponds to the fixed shell 12 of the diaphragm one by one, and the diaphragm 10 is fixed and distributed at equal intervals through the groove 13, achieving the same effect.

[0053] Installation process: During installation, first install the upper ends of several curtain membrane modules on the membrane rack and fix them to the membrane rack. Then, pass the fixed rod 6 through the through-hole 16 on the lower fixed shell of the curtain membrane module to penetrate several diaphragms 10 together. Rotate the fixed rod 6 to clamp the diaphragms 10 of the curtain membrane module in the corresponding grooves 13 of the fixed rod, and make the opening direction of the groove 13 vertically downward. Then, insert one end of the fixed rod 6 fixed to the diaphragm 10 into the rod support 8, and connect the other end to the fixed block 5 through a limit bolt. Adjust the installation height so that the bottom of the through-hole 16 of the installed fixed shell is stuck above the bottom end of the groove 13 to ensure that the fixed rod 6 does not rotate and at the same time the diaphragm does not slip out of the groove.

[0054] Principle of high anti-pollution: In the high anti-pollution immersion device of the present invention, a fixed shell is provided at the lower end of each diaphragm in the curtain membrane module. A limiting block is provided on the fixed shell or the diaphragms are distributed at equal intervals by using the fixed rod card slot method, and there is a certain gap between the diaphragms. Impurities such as sludge can freely fall from the gap and are not easily deposited at the root of the membrane filaments.

[0055] The aeration pipe is located directly below the curtain membrane module. The bubbles generated by aeration can rise along the gaps between the diaphragms, enhancing the turbulence degree of the sewage between the diaphragms and making the sewage concentration more uniform. At the same time, the membrane module can shake up and down within a certain range. Therefore, impurities such as sludge are not easily caked on the surface of the membrane filaments, and the aeration mixing and cleaning efficiency are higher.

[0056] For a high anti-pollution immersion ultrafiltration device of the present invention, the components are all common standard parts or parts known to those skilled in the art, and its structure and principle can be known by those skilled in the art through technical manuals or obtained through conventional experimental methods.

[0057] The above content shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0058] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for using a highly anti-pollution immersed ultrafiltration device, characterized in that, The high pollution resistance submerged ultrafiltration device comprises: a membrane frame (1) and a curtain membrane assembly (2); the upper part of the membrane frame (1) is provided with an air inlet flange (3) and a water outlet flange (4); the bottom part is provided with a plurality of aeration pipes (7); the characteristic is that: the aeration pipes (7) are located directly below the curtain membrane assembly (2); the curtain membrane assembly (2) comprises a plurality of membrane sheets (10); the upper ends of the plurality of membrane sheets (10) are encapsulated in a membrane shell (15); the lower end of each membrane sheet is provided with a fixed shell (12); the fixed shell (12) is provided with a through hole (16), the through hole ( 16) is provided with a fixing rod (6), and the fixing rod (6) is connected to the plurality of through holes (16) and can be detachably connected to the membrane frame (1); a groove (13) is provided on the fixing rod, and the depth of the groove (13) is 0.1-10 cm, ensuring that the fixing shell (12) can be stuck in the groove (13) and can move up and down within a certain range in the groove (13); a rod support (8) is provided on a crossbeam on one side of the bottom of the membrane frame parallel to the aeration pipe, and a fixing block (5) is provided on the crossbeam on the other side, and the rod support (8) and the fixing block (5) are fixedly connected to the crossbeam; It also includes the method of use, when using, first install the upper ends of several curtain membrane assemblies (2) on the membrane frame (1) and fix them to the membrane frame (1), then pass the fixing rod (6) through the through hole (16) on the fixing shell at the lower end of the curtain membrane assembly, pass several diaphragms (10) together, rotate the fixing rod (6) to clamp the diaphragm (10) of the curtain membrane assembly into the groove (13) corresponding to the fixing rod, and make the opening direction of the groove (13) vertically downward, then, insert one end of the fixing rod (6) fixed with the diaphragm (10) into the rod support (8), and connect the other end to the fixing block (5) through a limit bolt, adjust the installation height, so that the bottom of the fixed shell through hole (16) after installation is clamped above the bottom end of the groove (13), ensure that the fixing rod (6) does not rotate, and at the same time, the diaphragm does not slide out of the groove (13); When the curtain membrane assembly (2) becomes hardened, it is only necessary to pull the fixing rod (6) out of the through hole of the curtain membrane assembly (2), and the lower end of the curtain membrane assembly (2) will be free to spread out for cleaning without having to remove the entire curtain membrane assembly (2).

2. The method for using a highly anti-pollution submerged ultrafiltration device according to claim 1, characterized in that: A plurality of limit blocks (11) are provided on the fixed shell (12), and the limit blocks (11) are located on the side surfaces of the fixed shell (12).

3. The method for using a highly anti-pollution submerged ultrafiltration device according to claim 2, wherein: The height of the limiting block (11) and the fixed shell (12) in the vertical direction is 0.1-10 cm.

4. The usage method of a highly anti-pollution submerged ultrafiltration device according to claim 1, characterized in that: The width of the groove (13) is greater than or equal to the width of the fixed shells at the lower end of a membrane assembly when gathered together, and the number of the grooves (13) is the same as the number of the curtain membrane assemblies (2).

5. The method for using a highly anti-pollution immersed ultrafiltration device according to claim 1, wherein the width of the groove (13) is the same as the thickness of a single fixed shell (12), and the number of the grooves (13) is the same as the number of the fixed shells (12).

6. The usage method of a highly anti-pollution submerged ultrafiltration device according to claim 1, wherein the aeration pipe is provided with aeration holes (14) and sludge discharge holes (17) along the axial direction of the aeration pipe, the orientation of the aeration holes (14) is vertically upward, and the orientation of the sludge discharge holes (17) is vertically downward.

7. The usage method of a highly anti-pollution submerged ultrafiltration device according to claim 1, wherein the membrane sheet (10) comprises 1-6 layers of hollow fiber membrane filaments arranged in a straight line.

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