CN216260062U - MBR hollow fiber membrane module - Google Patents

Abstract

The utility model discloses an MBR hollow fiber membrane component, which comprises at least two curtains of water treatment hollow fiber membrane curtains, an aeration main pipe and aeration branch pipe components arranged between every two adjacent membrane curtains, wherein each aeration branch pipe component comprises a first aeration pipe and a plurality of flexible second aeration pipes, and the first aeration pipes and the plurality of flexible second aeration pipes are communicated with the aeration main pipe respectively; the first aeration pipe is provided with a plurality of groups of aeration holes which are arranged in parallel, and the plurality of groups of aeration holes are provided with at least two groups of first aperture aeration holes which are arranged oppositely and at least two groups of second aperture aeration holes which are arranged oppositely; the second aeration pipe is provided with a plurality of groups of third pore diameter aeration holes, and the self-made PVDF composite hollow fiber membrane filaments can be prepared by adopting a wet phase conversion method, so that the whole body has better deformability, the sludge on the water membrane curtain can be better removed, and the membrane curtain is not damaged; meanwhile, by controlling the aperture size and the orientation of each hole, the utility model has the advantages of high efficiency, energy conservation, uniform aeration, high biochemical treatment efficiency, good pollution resistance, long service life and the like.

Description

MBR hollow fiber membrane module

Technical Field

The utility model belongs to the technical field of preparation of separation membranes, and particularly relates to an MBR hollow fiber membrane component which has the advantages of high efficiency, energy conservation, uniform aeration, aeration energy consumption saving, high biochemical treatment efficiency, good pollution resistance and long service life.

Background

With the increasing water pollution, the treatment and discharge requirements of waste water are higher and higher. The membrane separation technology has the advantages of high quality of produced water, high automation degree and the like, becomes a preferred choice for wastewater treatment and upgrading transformation and reclaimed water reuse, and especially the MBR technology combining the biochemical treatment technology and the membrane separation technology is increasingly emphasized, wherein the hollow fiber membrane module is increasingly applied due to the advantages of high filling density, large specific surface area and the like. However, since the wastewater in the MBR membrane tank contains a large amount of pollutants and the sludge concentration is high, so that the water treatment hollow fiber membrane is rapidly polluted in use, and the separation performance of the water treatment hollow fiber membrane is rapidly reduced, continuous or intermittent aeration needs to be performed on the water treatment hollow fiber membrane filaments during the filtration process to shake off and clean the pollutants on the surface of the water treatment hollow fiber membrane filaments, so that the water treatment hollow fiber membrane filaments maintain good long-term separation performance. Wherein, too low aeration rate can not reach the clean effect to water treatment hollow fiber membrane silk, and can not satisfy biochemical oxygen demand of biochemical fungus, but too high aeration rate has following shortcoming again: 1) too high aeration can destroy the structure of sludge flocs, increase fine sludge particles in the wastewater, stimulate the dissolution of Extracellular Polymeric Substances (EPS), intensify biological pollution and intensify the ratio of membrane pollution to irreversible membrane pollution; 2) moreover, as the sludge flocs are damaged, biochemical bacterial colonies are scattered, the concentration of pollutants near the biochemical bacteria, particularly the concentration of refractory micromolecules is reduced, and the degradation efficiency of the biochemical bacteria is reduced; 3) in addition, the excessive aeration quantity can cause the hollow fiber membrane yarn in the water treatment to break, so that the separation function is completely lost; 4) the aeration quantity is too large, and the energy consumption of the system operation is increased.

The traditional membrane module aeration generally adopts a perforation aeration mode at the bottom of the membrane module, but the aeration mode has the problems of uneven aeration and insufficient cleaning force, and the aeration quantity of the aeration mode is large in order to achieve the cleaning effect on membrane filaments, so that the hollow fiber membrane filaments for water treatment are broken at the root, the biological pollution of the membrane is aggravated, the biochemical degradation efficiency in an MBR (membrane bioreactor) tank is reduced, the aeration energy consumption is high, and the aeration energy consumption accounts for 40-80% of the energy consumption of the whole treatment system. In addition, because the water treatment hollow fiber membrane filaments can only be aerated at the bottom of the membrane module, the aeration rate of the whole water treatment hollow fiber membrane filaments from top to bottom is not uniform, the aeration rate at the bottom of the water treatment hollow fiber membrane filaments is large, the water treatment hollow fiber membrane filaments are easy to break at the bottom, but the aeration rate at the upper part of the water treatment hollow fiber membrane filaments is still small, and the cleaning effect is difficult to achieve.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provides a novel MBR hollow fiber membrane component which not only is efficient and energy-saving, but also has the advantages of uniform aeration, aeration energy consumption saving, high biochemical treatment efficiency, good pollution resistance and long service life.

In order to achieve the purpose, the utility model adopts the technical scheme that: an MBR hollow fiber membrane module, comprising: the aeration main pipe is arranged at the bottom of the water treatment hollow fiber membrane curtain;

the MBR hollow fiber membrane module also comprises aeration branch pipe assemblies respectively arranged between every two adjacent water treatment hollow fiber membrane curtains, each aeration branch pipe assembly comprises a first aeration pipe and a plurality of second aeration pipes, the first aeration pipes and the plurality of second aeration pipes are respectively communicated with the aeration main pipe, the plurality of second aeration pipes are respectively arranged on the left side and the right side of the first aeration pipe, and the second aeration pipes are flexible;

the first aeration pipe is respectively provided with a plurality of groups of aeration holes which are arranged in parallel along the extending direction of the first aeration pipe, and the plurality of groups of aeration holes are provided with at least two groups of first aperture aeration holes which are arranged oppositely and at least two groups of second aperture aeration holes which are arranged oppositely;

a plurality of groups of third aperture aeration holes are respectively formed on the second aeration pipe;

the first aperture aeration holes are larger than the third aperture aeration holes in aperture diameter, the first aperture aeration holes face the second aeration pipes, the second aperture aeration holes face the water treatment hollow fiber membrane curtain, and the multiple groups of third aperture aeration holes are provided with at least one group of third aperture aeration holes which independently face the first aperture aeration holes and the water treatment hollow fiber membrane curtain.

In the utility model, because the membrane component is provided with the first aeration pipe, the second aperture aeration hole on the first aeration pipe can perform aeration cleaning action on the facing hollow fiber membrane curtain for water treatment, and the first aperture aeration hole facing the second aeration pipe can expose low-density large bubble flow (the aperture is relatively larger), and forms circular flow with high-density small bubble flow exposed by the second aeration pipe, and the pressure difference generated by the rising and bursting of the large bubble is filled by the small bubble and the mixed liquid driven by the small bubble, thereby increasing the movement of the active sludge in the membrane pool and the turbulent degree of the mixed liquid driven by the bubble, further increasing the shaking of the hollow fiber membrane yarn for water treatment, and generating stronger oblique cutting force on the surface of the hollow fiber membrane yarn for water treatment, so that pollutants are easier to fall off from the surface of the hollow fiber membrane yarn for water treatment, and improving the cleaning degree of the hollow fiber membrane yarn for water treatment, the pollution resistance of the whole membrane module is improved. In addition, the large bubble flow exposed by the first aeration pipe is combined with the small bubble flow exposed by the second aeration pipe to flush the sludge out of the membrane component, so that the sludge concentration in the membrane component is reduced, and the pollution resistance of the membrane component is improved.

In the utility model, each group of the first aperture aeration holes, each group of the second aperture aeration holes and each group of the third aperture aeration holes respectively and independently comprise a plurality of aeration holes.

According to some preferred aspects of the present invention, each set of the first aperture aeration holes, each set of the second aperture aeration holes and each set of the third aperture aeration holes may be arranged at equal intervals and uniformly distributed on the first aeration pipe or the second aeration pipe.

According to some preferred aspects of the present invention, the extending direction of the first aeration pipe and the extending direction of the second aeration pipe are respectively parallel to the extending direction of the water treatment hollow fiber membrane curtain.

According to some preferred aspects of the present invention, the first aeration pipe is located at the middle of the membrane module, and the plurality of second aeration pipes are arranged on the left and right sides of the first aeration pipe and are uniformly distributed.

According to some preferred aspects of the present invention, the first aperture aeration hole has a pore size of the order of millimeters and the third aperture aeration hole has a pore size of the order of micrometers.

According to some preferred aspects of the present invention, the first aperture aeration hole has an aperture that is more than 10 times larger than the aperture of the third aperture aeration hole.

Further, the aperture of the first aperture aeration hole is more than 20 times of the aperture of the third aperture aeration hole.

According to some preferred and specific aspects of the present invention, the first-aperture aeration holes have a pore size of 1mm to 10mm, the second-aperture aeration holes have a pore size of 0.1mm to 2mm, and the third-aperture aeration holes have a pore size of 0.5 μm to 50 μm.

In some embodiments of the utility model, the second aperture aeration pores have a pore size that is larger than the pore size of the third aperture aeration pores and smaller than the pore size of the first aperture aeration pores.

According to some preferred aspects of the present invention, the first aeration pipe has a pipe diameter larger than that of the second aeration pipe.

According to some preferred aspects of the present invention, the first aeration tube is made of stainless steel or PVC-U, which is also known as rigid PVC, and is composed of an amorphous thermoplastic resin obtained by polymerizing vinyl chloride monomer and a certain amount of additives (such as a stabilizer, a lubricant, a filler, etc.), and is commercially available.

According to some preferred aspects of the present invention, the second aeration tube includes an inner liner tube, which is a polyethylene terephthalate woven tube or a polyethylene terephthalate knitted tube, and a polyvinylidene fluoride film layer coated on an outer surface of the inner liner tube, and the third aperture aeration hole is formed on the inner liner tube and the polyvinylidene fluoride film layer.

Further, the outer diameter of the second aeration pipe is 1mm-10mm, and the thickness of the polyvinylidene fluoride film layer is 10 μm-200 μm.

In some embodiments of the present invention, the second aeration pipe is a PVDF composite hollow fiber membrane filament (inner lining pipe, polyvinylidene fluoride membrane layer coated on the outer surface of the inner lining pipe) prepared by a wet phase inversion method, and the third pore aeration holes are formed during the preparation of the membrane filament by the wet phase inversion method.

Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

(1) because the aeration branch pipe components are distributed between every two water treatment hollow fiber membrane curtains and can be parallel to the water treatment hollow fiber membrane curtains, each part of the water treatment hollow fiber membrane yarns, such as the upper part, the middle part and the lower part, can be uniformly aerated, and each part of the water treatment hollow fiber membrane yarns can be cleaned only by small aeration quantity, so that the total aeration quantity and the local aeration quantity of the whole membrane components can be reduced, the aeration energy consumption is reduced, the yarn breakage rate of the water treatment hollow fiber membrane yarns is reduced, and the service life of the water treatment hollow fiber membrane yarns is prolonged.

(2) Because the total aeration quantity and the local aeration quantity are reduced, and the aeration aperture of the second aeration pipe is smaller, the exposed bubbles are smaller, and the cutting and destructive power to sludge flocs and biochemical bacterial colonies is smaller, so that the concentration of dissolving out small-particle sludge and extracellular polymeric substances in wastewater is reduced, the membrane pollution probability and the irreversible biological pollution rate are reduced, and the anti-pollution performance of the membrane module is improved.

(3) Because the bubbles exposed by the second aeration pipe are small, the cutting and destructive power to sludge flocs and biochemical bacterial colonies is small, and the concentration of pollutants near the biochemical bacteria, especially the concentration of the small molecular substances difficult to degrade is high, so that the biochemical degradation efficiency of the biochemical bacteria on the pollutants is improved, the water quality of the produced water of the MBR system is improved, and the membrane pollution probability is reduced.

(4) Because the first aeration pipe is arranged on the membrane component, the second aperture aeration hole on the first aeration pipe can carry out aeration cleaning action on the facing water treatment hollow fiber membrane curtain, the first aperture aeration hole (with relatively larger aperture) facing the second aeration pipe can expose low-density large bubble flow, the large bubble flow and high-density small bubble flow exposed by the third aperture aeration hole (with relatively smaller aperture) of the second aeration pipe form circular flow, the pressure difference generated by the rising and bursting of the large bubbles is filled by the small bubbles and the mixed liquid driven by the small bubbles, so that the movement of the active sludge in the membrane tank and the turbulent degree of the mixed liquid driven by the bubbles are increased, the shaking of the water treatment hollow fiber membrane yarn is increased, and stronger oblique cutting force is generated on the surface of the water treatment hollow fiber membrane yarn, the pollutants are easier to fall off from the surface of the water treatment hollow fiber membrane yarn, and the cleaning degree of the water treatment hollow fiber membrane yarn is increased, the pollution resistance of the whole membrane module is improved. In addition, the large bubble flow exposed by the first aeration pipe is combined with the small bubble flow exposed by the second aeration pipe to flush the sludge out of the membrane component, so that the sludge concentration in the membrane component is reduced, and the pollution resistance of the membrane component is improved.

In conclusion, the MBR hollow fiber membrane module with the specific structure can not only uniformly aerate different parts of the water treatment hollow fiber membrane yarn and achieve the cleaning effect on the surface of the water treatment hollow fiber membrane yarn, but also can not reduce the biochemical efficiency and save the aeration energy consumption.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a schematic top cross-sectional view of an MBR hollow fiber membrane module according to an embodiment of the present invention;

FIG. 2 is a schematic sectional view A-A of an MBR hollow fiber membrane module according to an embodiment of the present invention;

FIG. 3 is a schematic sectional view B-B of an MBR hollow fiber membrane module according to an embodiment of the present invention;

FIG. 4 is an enlarged schematic view of detail C of FIG. 2;

FIG. 5 is an enlarged schematic view of detail D of FIG. 2;

FIG. 6 is a schematic structural view of an aeration branch pipe assembly in an MBR hollow fiber membrane assembly (with hidden water treatment hollow fiber membrane curtains and the like) according to an embodiment of the present invention;

FIG. 7 is an enlarged schematic view of detail E of FIG. 6;

in the above drawings: 1. hollow fiber membrane filaments; 21. fixing the end head; 22. a first aeration pipe fixing groove with an upper fixing end; 31. a lower fixed end; 32. A first aeration pipe hole site on the lower fixed end; 41. an aeration main pipe; 42. a first aeration pipe; 43. a second aeration pipe; 44. a first aperture aeration hole; 45. a second aperture aeration hole; 46. a third aperture aeration hole; 51. a water production pipe; 52. and (4) a membrane module joint.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The MBR hollow fiber membrane module at present adopts the mode of bottom perforation aeration to carry out aeration cleaning to water treatment hollow fiber membrane silk more, but the aeration rate of this kind of aeration mode will be great can reach clean effect to water treatment hollow fiber membrane silk surface, so the aeration energy consumption is higher, and the aeration is inhomogeneous, water treatment hollow fiber membrane silk easily breaks at the bottom, and water treatment hollow fiber membrane silk upper portion can not reach clean effect, in addition the biochemical efficiency in the MBR membrane pond is low, and because dissolving out of tiny particle mud and extracellular polymeric substance, aggravate the rate of membrane pollution and irreversible pollution on the contrary. Based on the above, the utility model provides an efficient and energy-saving MBR hollow fiber membrane module, which aerates the water treatment hollow fiber membrane filaments in an aeration mode of combining a second aeration pipe and a first aeration pipe which are uniformly distributed between every two water treatment hollow fiber membrane curtains, so that each part of the water treatment hollow fiber membrane filaments is uniformly aerated, the total aeration amount and the local aeration amount are reduced while the membrane surface cleaning effect is achieved, the aeration energy consumption is saved, the biochemical efficiency in a membrane tank is improved, the filament breakage rate of the water treatment hollow fiber membrane filaments is reduced, the membrane pollution and the irreversible pollution rate are reduced, and the service life of the membrane module is prolonged.

Specifically, as shown in fig. 1 to 7, the present example provides an MBR hollow fiber membrane module, including: the aeration device comprises an upper fixed end 21, a lower fixed end 31, a water production pipe 51 connected with the upper fixed end 21, an aeration main pipe 41 connected with the lower fixed end 31, a membrane module joint 52 and at least two water treatment hollow fiber membrane curtains which are arranged between the upper fixed end 21 and the lower fixed end 31 in parallel, wherein the water treatment hollow fiber membrane curtains are composed of a plurality of hollow fiber membrane filaments 1, the upper ends of the hollow fiber membrane curtains are fixed on the upper fixed end 21, the lower ends of the hollow fiber membrane curtains are fixed on the lower fixed end 31, and the aeration main pipe 41 is also arranged at the bottom of the water treatment hollow fiber membrane curtains.

Further, the MBR hollow fiber membrane module also comprises aeration branch pipe assemblies respectively arranged between every two adjacent water treatment hollow fiber membrane curtains, namely, the aeration branch pipe assemblies are respectively arranged between every two adjacent water treatment hollow fiber membrane curtains, each aeration branch pipe assembly comprises a first aeration pipe 42 and a plurality of second aeration pipes 43 which are respectively communicated with the aeration main pipe 41, the second aeration pipes 43 are respectively arranged at the left side and the right side of the first aeration pipe 42, the second aeration pipes 43 have flexibility, the flexible second aeration pipes 43 can enable the second aeration pipes to shake in the aeration process, and further can be infinitely close to or even directly contact with the water treatment hollow fiber membrane curtains, sludge and the like on the water treatment hollow fiber membrane curtains can be better cleaned, and the water treatment hollow fiber membrane curtains cannot be damaged;

wherein, a plurality of groups of aeration holes which are arranged in parallel are respectively arranged on the first aeration pipe 42 along the extending direction of the first aeration pipe, and the plurality of groups of aeration holes are provided with at least two groups of first aperture aeration holes 44 which are arranged oppositely and at least two groups of second aperture aeration holes 45 which are arranged oppositely;

a plurality of groups of third aperture aeration holes 46 are respectively arranged on the second aeration pipe 43;

the first aperture aeration holes 44 have a larger aperture than the third aperture aeration holes 46, the first aperture aeration holes are directed to the second aeration pipe 43 at 44, the second aperture aeration holes 45 are directed to the water treatment hollow fiber membrane curtain, and the above-mentioned plurality of sets of third aperture aeration holes 46 have at least one set of third aperture aeration holes 46 each directed to the first aperture aeration holes 44 and the water treatment hollow fiber membrane curtain independently.

In this example, each set of first aperture aeration holes 44, each set of second aperture aeration holes 45, and each set of third aperture aeration holes 46 each independently include a plurality of aeration holes, and in each set of first aperture aeration holes 44, each set of second aperture aeration holes 45, and each set of third aperture aeration holes 46, the holes may be arranged at equal intervals, and are uniformly distributed on first aeration pipe 42 or second aeration pipe 43.

In this embodiment, the extending direction of the first aeration pipe 42 and the extending direction of the second aeration pipe 43 are respectively parallel to the extending direction of the water treatment hollow fiber membrane curtain, the first aeration pipe 42 is located at the middle part of the membrane module, and the plurality of second aeration pipes 43 are respectively arranged at the left and right sides of the first aeration pipe 42 and are uniformly distributed.

In this example, the first-aperture aeration holes 44 have a pore size of millimeter order and the third-aperture aeration holes 46 have a pore size of micrometer order, and the pore size of the first-aperture aeration holes 44 is preferably 10 times or more, more preferably 20 times or more, and still more preferably 20 to 20000 times the pore size of the third-aperture aeration holes 46. Specifically, in this example, the first-aperture aeration holes 44 have an aperture of 1mm to 10mm, the second-aperture aeration holes 45 have an aperture of 0.1mm to 2mm, and the third-aperture aeration holes 46 have an aperture of 0.5 μm to 50 μm. As some alternative embodiments, the second aperture aeration holes 45 have a larger aperture than the third aperture aeration holes 46 and smaller aperture than the first aperture aeration holes 44.

In this example, the diameter of the first aeration pipe 42 is larger than the diameter of the second aeration pipe 43. Meanwhile, the first aeration pipe 42 is made of stainless steel or PVC-U, which is also called rigid PVC, and is composed of an amorphous thermoplastic resin prepared by polymerization of vinyl chloride monomer and a certain amount of additives (such as a stabilizer, a lubricant, a filler, etc.), and is commercially available. The second aeration pipe 43 includes an inner liner pipe, a polyvinylidene fluoride film layer coated on the outer surface of the inner liner pipe, the inner liner pipe is a polyethylene terephthalate woven pipe or a polyethylene terephthalate knitted pipe, and third aperture aeration holes 46 are formed on the inner liner pipe and the polyvinylidene fluoride film layer. Further, the outer diameter of the second aeration pipe 43 is 1mm-10mm, and the thickness of the polyvinylidene fluoride film layer is 10 μm-200 μm. Optionally, the second aeration pipe 43 is a PVDF composite hollow fiber membrane filament (lining pipe, polyvinylidene fluoride membrane layer coated on the outer surface of the lining pipe) prepared by a wet phase inversion method, and the third pore aeration hole 46 is formed in the process of preparing the membrane filament by the wet phase inversion method, so that the third pore aeration hole 46 formed by the preparation method has not only diversity of orientation and sludge removal force in more directions, but also simple preparation method, softer overall and stronger deformability, can better remove sludge and the like on a water treatment hollow fiber membrane curtain, and cannot damage the water treatment hollow fiber membrane curtain.

In one aspect, the second aeration pipe 43 may be a hydrophobic PVDF composite hollow fiber membrane supported by an inner lining pipe, the inner lining pipe is a woven pipe made of PET, a PVDF membrane layer is coated on the surface of the inner lining pipe by a wet phase inversion method, and countless micron-sized aeration micropores (third pore size aeration holes 46) are formed on the surface of the PVDF composite hollow fiber membrane during the membrane preparation process by the wet phase inversion method, and the pore size of the aeration micropores is 0.5-50 μm.

Specifically, in this embodiment, the upper fixed end 21 is provided with a first aeration pipe fixing groove 22, the lower fixed end 31 is provided with a first aeration pipe hole 32, the upper end and the lower end of the first aeration pipe 42 are respectively fixed on the upper fixed end 21 and the lower fixed end 31 through the first aeration pipe fixing groove 22 and the first aeration pipe hole 32, and the lower portion of the first aeration pipe 42 further passes through the first aeration pipe hole 32 and is communicated with the aeration main pipe 41.

In this embodiment, as shown in fig. 2 to 3, the membrane module of this embodiment is provided with two vertical water treatment hollow fiber membrane curtains arranged in parallel, the second aeration pipe 43 and the first aeration pipe 42 are also arranged in vertical, the plurality of second aeration pipes 43 are evenly distributed on both sides of the first aeration pipe 42, and the second aeration pipe 43 and the first aeration pipe 42 are distributed in parallel in the middle of the two curtain water treatment hollow fiber membrane curtains. The upper ends of the water treatment hollow fiber membrane curtain, the second aeration pipe 43 and the first aeration pipe 42 are cast in the upper fixing head 21, and the lower ends of the water treatment hollow fiber membrane curtain, the second aeration pipe 43 and the first aeration pipe 42 are cast in the lower fixing head 31.

In this example, the upper fixed end 21 is bonded to the water production pipe 51, the lower fixed end 31 is bonded to the aeration main 41, and the 4 membrane module joints 52 are bonded to the two ends of the water production pipe 51 and the aeration main 41 respectively.

Wherein the hollow water production pipeline inside the water treatment hollow fiber membrane filament 1 is communicated with a water production pipe 51 and is communicated with a water production pipe outside the membrane module through a membrane module joint 52.

The hollow aeration pipeline of the second aeration pipe 43 is communicated with the hollow aeration pipeline of the aeration main 41, the hollow aeration pipeline of the first aeration pipe 42 is communicated with the hollow aeration pipeline of the aeration main 41 through the first aeration pipe hole site 32 on the lower fixed end, and the aeration main 41 is communicated with an external air source through the membrane component connectors 52 at two ends.

Specifically, the membrane module in this example can be prepared by, but is not limited to, the following methods, which are merely exemplary:

1) firstly, coating a PVDF film layer on the surface of a PET braided tube, preparing a PVDF composite hollow fiber membrane wire by a wet phase conversion method, controlling the proportion of a casting solution and membrane preparation process parameters to ensure that the PVDF composite hollow fiber membrane wire presents hydrophobicity, forming a plurality of micron-sized aeration micropores (third pore diameter aeration holes 46) on the surface of the PVDF composite hollow fiber membrane wire, wherein the pore diameter of the aeration micropores is 0.5-50 mu m, and the prepared PVDF composite hollow fiber membrane wire is the second aeration tube 43 with the hydrophobic function.

2) The upper end of the first aeration pipe 42 is arranged in the first aeration pipe fixing groove 22 of the upper fixing end 21; a plurality of second aeration pipes 43 are evenly distributed on two sides of the first aeration pipe 42, and a plurality of water treatment hollow fiber membrane filaments 1 are divided into two water treatment hollow fiber membrane curtains; then two curtains of water treatment hollow fiber membrane curtains are distributed on two sides of an aeration plane formed by the first aeration pipe 42 and the second aeration pipe 43 in parallel, the upper ends of the water treatment hollow fiber membrane curtains and the second aeration pipe 43 are installed in the upper fixed end 21, and the top of the water treatment hollow fiber membrane yarn 1 is ensured to be 1-10cm higher than the top of the first aeration pipe 42, and the top of the second aeration pipe 43 is 1-10cm lower than the top of the upper first aeration pipe 42. And then adding sealant into the upper fixed end 21, and pouring the upper parts of the water treatment hollow fiber membrane curtain, the first aeration pipe 42 and the second aeration pipe 43 into the upper fixed end 21 after the sealant is cured. Then, the upper end of the upper fixing end 21 is cut off at a position between the top of the water treatment hollow fiber membrane yarn 1 and the top of the first aeration pipe 42, so as to ensure that the hollow water production pipeline of the water treatment hollow fiber membrane yarn 1 is opened, but the hollow aeration pipelines of the first aeration pipe 42 and the second aeration pipe 43 are in a sealed state.

3) The upper fixed end 21 is bonded with the water production pipe 51, so that the hollow water production pipe of the water treatment hollow fiber membrane yarn 1 is communicated with the water production pipe 51.

4) The first aeration pipe 42 is arranged in the first aeration pipe hole site 32 of the lower fixed end head 31, the lower ends of the plurality of second aeration pipes 43 and the two-curtain water treatment hollow fiber membrane curtains are vertically arranged in the lower fixed end head 31, the position arrangement of the first aeration pipes 42, the second aeration pipes 43 and the two-curtain water treatment hollow fiber membrane curtains is ensured to be consistent with the upper part, namely the plurality of second aeration pipes 43 are evenly distributed on two sides of the first aeration pipe 42, the two-curtain water treatment hollow fiber membrane curtains are distributed on two sides of an aeration plane formed by the first aeration pipe 42 and the second aeration pipe 43 in parallel, the bottom of the water treatment hollow fiber membrane curtains is ensured to be 1-10cm higher than the bottom of the first aeration pipe 42, and the bottom of the second aeration pipe 43 is 1-10cm lower than the bottom of the upper first aeration pipe 42. And then pouring the sealant into the lower fixing end 31, and after the sealant is cured, pouring the lower parts of the water treatment hollow fiber membrane curtain, the first aeration pipe 42 and the second aeration pipe 43 into the lower fixing end 31. Then, the lower end of the lower fixing end 31 is cut off between the bottom of the first aeration pipe 42 and the bottom of the second aeration pipe 43 to ensure that the hollow aeration pipelines of the second aeration pipe 43 and the first aeration pipe 42 are both opened, but the hollow water generating pipeline of the water treatment hollow fiber membrane curtain is still in a sealed state.

5) The lower fixing end 31 and the aeration header 41 are bonded together, so that the first aeration pipe 42 and the second aeration pipe 43 are communicated with the aeration header 41.

6) And 4 membrane component connectors 52 are respectively bonded with the water production pipe 51 and the left end and the right end of the aeration main pipe 41, so that the complete high-efficiency and energy-saving MBR hollow fiber membrane component is manufactured.

In this example, the membrane module produced water enters the water production pipe 51 through the hollow water production pipe of the water treatment hollow fiber membrane filaments 1, and then is discharged to a water production pipe outside the membrane module through the membrane module joint 52.

In this example, the gas flow enters the aeration header pipe 41 through the membrane module joint 52, then enters the second aeration pipe 43 and the first aeration pipe 42 embedded in the first aeration pipe hole site 32 on the lower fixing end 31, and finally is exposed through the large and small aeration holes on the first aeration pipe 42 and the countless aeration micropores on the second aeration pipe 43.

In conclusion, the MBR hollow fiber membrane module of the present invention has some effects as follows:

1) because the second aeration pipes 43 are uniformly distributed between every two water treatment hollow fiber membrane curtains and are parallel to the water treatment hollow fiber membrane curtains, each part of the water treatment hollow fiber membrane yarn 1, such as the upper part, the middle part and the lower part, can be uniformly aerated, and each part of the water treatment hollow fiber membrane yarn 1 can be cleaned only by small aeration amount, so that the total aeration amount and the local aeration amount of the whole membrane module can be reduced, and the aeration energy consumption can be obviously saved. In addition, because each part of the water treatment hollow fiber membrane yarn 1 can be uniformly aerated and the local aeration amount is small, the yarn breakage rate of the water treatment hollow fiber membrane yarn 1 can be reduced, and the service life of the membrane module is prolonged.

2) Because the total aeration quantity and the local aeration quantity are reduced, and the aeration aperture of the second aeration pipe 43 is smaller, the exposed air bubbles are smaller, the cutting and destructive power to sludge flocs and biochemical colonies is smaller, so that the concentration of small-particle sludge and the concentration of extracellular polymeric substances dissolved out in wastewater are reduced, the membrane pollution probability and the irreversible biological pollution rate are reduced, and the anti-pollution performance of the membrane module is improved.

3) Because the air bubbles exposed by the second aeration pipe 43 are small, the cutting and destructive power to sludge flocs and biochemical bacterial colonies is small, the concentration of pollutants near the biochemical bacteria, especially the concentration of micromolecule substances of refractory substances, is higher, the biochemical degradation efficiency of the biochemical bacteria to the pollutants is improved, the water quality of the MBR system is improved, and the membrane pollution probability is reduced.

4) Because the first aeration pipe 42 is arranged on the membrane component, the second aperture aeration hole on the first aeration pipe 42 can carry out aeration cleaning action on the facing water treatment hollow fiber membrane curtain, the first aperture aeration hole 44 (with relatively larger aperture) facing the second aeration pipe 43 can expose low-density large bubble flow, and form circulation flow with high-density small bubble flow from the third aperture aeration hole 46 (with relatively smaller aperture) of the second aeration pipe 43, the pressure difference generated by the rising and burst of the large bubbles is filled by the small bubbles and the mixed liquid driven by the small bubbles, thereby increasing the motion of the active sludge in the membrane pool and the degree of the turbulent mixed liquid driven by the bubbles, further increasing the shake of the water treatment hollow fiber membrane filament 1, and generating stronger oblique cutting force on the surface of the water treatment hollow fiber membrane filament 1, so that pollutants can be easily dropped from the surface of the water treatment hollow fiber membrane filament 1, the cleaning degree of the hollow fiber membrane wires 1 for water treatment is improved, and the pollution resistance of the whole membrane module is improved. In addition, the large bubble flow exposed by the first aeration pipe 43 is combined with the small bubble flow exposed by the second aeration pipe 43 to flush the sludge out of the membrane module, so that the sludge concentration in the membrane module is reduced, and the pollution resistance of the membrane module is improved.

5) Because the second aeration pipe 43 is a PVDF composite hollow fiber membrane yarn, the material of the PVDF composite hollow fiber membrane yarn is the same as or close to that of the water treatment hollow fiber membrane yarn 1, and the first aeration pipe 42 can be embedded into the first aeration pipe fixing groove 22 of the upper fixing end 21 and the first aeration pipe hole 32 of the lower fixing end 31, the second aeration pipe 43 and the first aeration pipe 42 can be directly cast into the upper fixing end 21 and the lower fixing end 31 in the process of casting the water treatment hollow fiber membrane curtain, the membrane module manufacturing process is simple, and the manufacturing time cost and the bonding glue cost are saved.

6) Because second aeration pipe 43 is soft PVDF composite hollow fiber membrane silk, so can shake voluntarily in the aeration process and be close to water treatment hollow fiber membrane silk 1, intermittent type nature shortens the distance between second aeration pipe 43 and the water treatment hollow fiber membrane silk 1, and then improves the cleaning power to water treatment hollow fiber membrane silk 1 surface to reach better clean effect, and can not harm water treatment hollow fiber membrane silk 1.

7) Because the second aeration pipe 43 and the first aeration pipe 42 are arranged inside the membrane module and are integrated with the water treatment hollow fiber membrane curtain for filtration, and the aeration main pipe 41 is bonded with the whole membrane module into a whole, the occupied area of the membrane system is greatly saved and the occupied cost is saved compared with the membrane module with the aeration pipes which are arranged independently.

The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the utility model, and not to limit the scope of the utility model, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.

Claims (10)

1. An MBR hollow fiber membrane module, comprising: at least two curtains water treatment hollow fiber membrane curtains that are parallel to each other, set up and be in the aeration main of the bottom of water treatment hollow fiber membrane curtain, its characterized in that:

the MBR hollow fiber membrane module also comprises aeration branch pipe assemblies respectively arranged between every two adjacent water treatment hollow fiber membrane curtains, each aeration branch pipe assembly comprises a first aeration pipe and a plurality of second aeration pipes, the first aeration pipes and the plurality of second aeration pipes are respectively communicated with the aeration main pipe, the plurality of second aeration pipes are respectively arranged on the left side and the right side of the first aeration pipe, and the second aeration pipes are flexible;

the first aeration pipe is respectively provided with a plurality of groups of aeration holes which are arranged in parallel along the extending direction of the first aeration pipe, and the plurality of groups of aeration holes are provided with at least two groups of first aperture aeration holes which are arranged oppositely and at least two groups of second aperture aeration holes which are arranged oppositely;

a plurality of groups of third aperture aeration holes are respectively formed on the second aeration pipe;

the first aperture aeration holes are larger than the third aperture aeration holes in aperture diameter, the first aperture aeration holes face the second aeration pipes, the second aperture aeration holes face the water treatment hollow fiber membrane curtain, and the multiple groups of third aperture aeration holes are provided with at least one group of third aperture aeration holes which independently face the first aperture aeration holes and the water treatment hollow fiber membrane curtain.

2. The MBR hollow fiber membrane module of claim 1, wherein: the extending direction of the first aeration pipe and the extending direction of the second aeration pipe are respectively parallel to the extending direction of the water treatment hollow fiber membrane curtain.

3. The MBR hollow fiber membrane module of claim 1, wherein: the aperture of the first aperture aeration hole is millimeter level, and the third aperture aeration hole is micron level.

4. The MBR hollow fiber membrane module according to claim 1 or 3, characterized in that: the aperture of the first aperture aeration hole is more than 10 times of the aperture of the third aperture aeration hole.

5. The MBR hollow fiber membrane module of claim 4, wherein: the aperture of the first aperture aeration hole is more than 20 times of the aperture of the third aperture aeration hole.

6. The MBR hollow fiber membrane module according to claim 1 or 3, characterized in that: the aperture of the first aperture aeration hole is 1mm-10mm, the aperture of the second aperture aeration hole is 0.1mm-2mm, and the aperture of the third aperture aeration hole is 0.5 μm-50 μm.

7. The MBR hollow fiber membrane module of claim 6, wherein: the aperture of the second aperture aeration hole is larger than that of the third aperture aeration hole and smaller than that of the first aperture aeration hole.

8. The MBR hollow fiber membrane module of claim 1, wherein: the pipe diameter of the first aeration pipe is larger than that of the second aeration pipe.

9. The MBR hollow fiber membrane module of claim 1, wherein: the first aeration pipe is made of stainless steel or PVC-U, the second aeration pipe comprises an inner lining pipe and a polyvinylidene fluoride film layer coated on the outer surface of the inner lining pipe, the inner lining pipe is a polyethylene terephthalate woven pipe or a polyethylene terephthalate knitted pipe, and the third aperture aeration hole is formed in the inner lining pipe and the polyvinylidene fluoride film layer.

10. The MBR hollow fiber membrane module of claim 9, wherein: the outer diameter of the second aeration pipe is 1mm-10mm, and the thickness of the polyvinylidene fluoride film layer is 10 μm-200 μm.

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