CN112844052A

CN112844052A - Hollow fiber curtain type membrane assembly for MBR process

Info

Publication number: CN112844052A
Application number: CN202011559641.2A
Authority: CN
Inventors: 杨中博; 曾凡付; 钱铖; 许白羽
Original assignee: Deland Water Technology Co ltd
Current assignee: Deland Water Technology Co ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-05-28

Abstract

The hollow fiber curtain type membrane assembly for the MBR process comprises a membrane main body consisting of a plurality of hollow fiber membrane filaments, wherein an upper end enclosure and a lower end enclosure are respectively installed at two ends of the membrane main body, an air distribution pipe is communicated between the upper end enclosure and the lower end enclosure and is communicated with an air inlet pipe arranged at the bottom of the membrane main body, and air distribution holes used for flushing the membrane main body are distributed in the air distribution pipe. The membrane module effectively solves the problem of bottom mud accumulation through the air distribution holes close to the distributed lower end socket, and the membrane filament filling area in a unit space is increased through the horizontal air distribution holes far away from the lower end socket, so that the efficiency of filtering water is improved.

Description

Hollow fiber curtain type membrane assembly for MBR process

Technical Field

The invention relates to the technical field of sewage treatment, in particular to a hollow fiber curtain type membrane component for an MBR (membrane bioreactor) process.

Background

The Membrane Bioreactor (MBR) process is a high-efficiency sewage treatment and recycling technology combining the traditional biological water treatment technology and the modern Membrane separation technology. In an MBR system, a membrane module is utilized to replace a secondary sedimentation tank to efficiently and thoroughly separate sludge and water under the condition of keeping the original step of removing partial pollutants in sewage through the biochemical action of microorganisms, so that the sludge retention time and the hydraulic retention time can be mutually independent, the sludge concentration in a biochemical tank and the accumulation of specific bacteria in activated sludge are effectively improved, and the biochemical reaction rate is further increased. The membrane bioreactor comprises a hollow fiber membrane component, the filling density of the membrane bioreactor is higher, the automation degree of a casting process in the production and processing process is higher, and a perforated aeration pipe is arranged right below the membrane component and is adopted for hydraulically washing the hollow fiber membrane through high-strength aeration in the aspect of inhibiting membrane pollution in the hollow fiber membrane curtain type membrane component on the market at present.

However, the water flow scouring strength of the hollow fiber membrane root is still very small, the sludge accumulation phenomenon at the membrane filament root is relatively serious, especially when the hollow fiber membrane is vertically placed, the sludge accumulation on the lower end socket surface is particularly serious due to the influence of the lower end socket of the component, the aeration rate is increased, the bottom sludge accumulation phenomenon is not effectively solved, and the operation energy consumption of the process is also increased. On the other hand, in the general curtain type hollow fiber membrane module, the membrane filament filling area per unit space still needs to be increased.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

The first purpose of the invention is to provide a hollow fiber curtain type membrane component for MBR process, which effectively solves the problem of bottom mud accumulation through the air distribution holes close to the distribution lower end socket.

A second object of the present invention is to provide a membrane bioreactor comprising a hollow fiber curtain membrane module of an MBR process.

It is a third object of the present invention to provide a water treatment apparatus comprising a membrane bioreactor.

In order to achieve the above purpose of the present invention, the following technical solutions are adopted:

the invention provides a hollow fiber curtain type membrane assembly for an MBR process, which comprises a membrane main body consisting of a plurality of hollow fiber membrane filaments, wherein an upper end enclosure and a lower end enclosure are respectively arranged at two ends of the membrane main body, a gas distribution pipe is communicated between the upper end enclosure and the lower end enclosure and is communicated with a gas inlet pipe arranged at the bottom of the membrane main body, and gas distribution holes for flushing the membrane main body are distributed on the gas distribution pipe.

The water flow scouring strength of the root of the hollow fiber membrane in the prior art is still very small, the sludge accumulation phenomenon at the root of the membrane fiber is serious, especially when the hollow fiber membrane is vertically placed, the sludge accumulation on the lower end casting surface is serious due to the influence of the lower end socket of the component, the aeration quantity is increased, the bottom sludge accumulation phenomenon is not effectively solved, and the operation energy consumption of the process is also increased. On the other hand, in the general curtain type hollow fiber membrane module, the membrane filament filling area per unit space still needs to be increased.

In order to solve the problems, the invention provides a hollow fiber curtain type membrane component for an MBR process, which effectively solves the phenomenon of bottom mud accumulation through air distribution holes close to a distribution lower end socket, improves the membrane filament filling area in a unit space through horizontal air distribution holes far away from the lower end socket, and improves the efficiency of filtering water.

Preferably, the gas distribution pipe is arranged in the vertical direction and used for bearing the gravity of the lower sealing head and the pulling force during swinging. In the prior art, the membrane main body consisting of the hollow fiber membrane wires bears most of the gravity and the pulling force during swinging, so that the hollow fiber membrane wires are easy to break.

Preferably, the membrane main body surrounds the periphery of the gas distribution pipe so as to expand the range of the gas distribution pipe for washing the membrane main body.

Preferably, the membrane body surrounding the gas distribution pipe is equally divided into eight equal parts, and the cross-sectional area of the gas distribution pipe region is equal to that of one equal part.

The membrane main body is uniformly divided into eight equal parts, the cross sectional area of the air distribution pipe region is equal to that of one of the eight equal parts, and the eight equal parts of the membrane main body uniformly surround the periphery of the air distribution pipe, so that gas sprayed by the air distribution pipe can be uniformly distributed into the membrane main body, and the range of the air distribution pipe for washing the membrane main body is expanded.

Preferably, the air distribution holes are densely distributed in the area close to the lower end socket, and the orifices of the air distribution holes face the lower end socket and are used for flushing sludge close to the bottom of the membrane main body. The orifices of the air distribution holes face the lower end enclosure, so that the air from the bottom air distribution holes does not vertically rise, but firstly washes the position of the membrane main body close to the lower end enclosure, thereby improving the turbulence of water flow of the part easy to accumulate mud, ensuring that the solid in the stock solution is not easy to precipitate and stay near the lower end enclosure, and further avoiding the problem of serious mud accumulation at the position of the membrane main body close to the lower end enclosure.

Preferably, the air distribution holes far away from the lower end enclosure are loosely distributed, and the orifice direction of the air distribution holes is along the horizontal direction. The gas horizontally enters the membrane main body, so that the membrane filament filling area in a unit space is increased, and the efficiency of filtering water is improved.

The air distribution holes have various shapes, numbers, sizes and distributions. The shape of the air distribution hole can be circular or elongated, the air distribution hole is linearly and uniformly distributed along the vertical direction, and when the air distribution hole is a strip-shaped hole, the long edge of each hole is parallel to the membrane main body. The air distribution holes which are positioned on the membrane main body and are close to the lower end enclosure are dense in quantity and distribution, the distance range of the air distribution holes from the membrane main body can be 0-50mm, the preferred distance is 10-30mm, and the diameter or the length of the short side of each air distribution hole is 1-10mm, and the preferred distance is 1-5 mm.

Preferably, the hollow fiber curtain membrane module further comprises a housing disposed outside the membrane main body to confine gas generated from the gas inlet pipe. The effect of casing is that there is a better constraint effect to the air water two-phase flow that the aeration produced, make its control within the casing scope, can just can obtain higher aeration intensity in the membrane main part under the condition of less aeration rate, make air water two-phase flow have better washing effect to membrane silk surface, the development of suppression membrane pollution that can be fine, and show the saving aeration energy consumption after can, propose when the subassembly unit quantity that uses is more and install the casing in peripheral subassembly, make the inside aeration rate of whole equipment comparatively average, make the pollution progress of all subassemblies comparatively unanimous, make things convenient for follow-up whole washing and dismouting.

Preferably, a water production collection chamber, a water production pipe and an air inlet pipe are arranged in the upper end enclosure, and the air inlet pipe is connected with the air distribution pipe. The upper end enclosure can be provided with an air inlet pipe and a water production pipe. The number of the water producing pipes or the air inlet pipes can be selected according to the actual engineering situation, one air inlet pipe and one water producing pipe can be selected, or two or more air inlet pipes and water producing pipes can be selected. Rigid water pipes are selected as the air inlet pipe and the water production pipe, and PVC or UPVC is preferred. The diameter range of the water production pipe and the air inlet pipe is 10-100mm, and preferably 20-60 mm.

The invention also provides a membrane bioreactor of the hollow fiber curtain type membrane component comprising the MBR process.

The invention also provides water treatment equipment comprising the membrane bioreactor. Any apparatus comprising a membrane module having the specific structure of the present invention is within the scope of the present invention.

Compared with the prior art, the invention has the beneficial effects that:

(1) according to the hollow fiber curtain type membrane component, the air distribution pipe is arranged, so that the stress of the membrane main body is reduced, and the risk of breakage of hollow fiber membrane filaments is reduced.

(2) The hollow fiber curtain type membrane component effectively solves the problem of bottom mud accumulation through the air distribution holes arranged in the air distribution pipe, so that the membrane filament filling area in a unit space is increased, and the efficiency of filtering water is improved.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a longitudinal sectional view of a hollow fiber curtain membrane module provided in example 1 of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

fig. 3 is a partially enlarged view of an upper head of a hollow fiber curtain membrane module provided in example 1 of the present invention;

fig. 4 is a partially enlarged view of a lower head of a hollow fiber curtain membrane module provided in example 1 of the present invention.

Wherein:

1-hollow fiber membrane filaments; 2-a film body;

3, sealing the head; 4-lower end enclosure;

5-a water production pipe; 6, an air inlet pipe;

7-produced water collection chamber; 8-gas distribution pipe;

9-air distribution holes; 10-water producing channel.

Detailed Description

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and the detailed description, but those skilled in the art will understand that the following described embodiments are some, not all, of the embodiments of the present invention, and are only used for illustrating the present invention, and should not be construed as limiting the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In order to more clearly illustrate the technical solution of the present invention, the following description is made in the form of specific embodiments.

Example 1

Referring to fig. 1-2, the present embodiment provides a hollow fiber curtain membrane module including: the device comprises an upper seal head 3 and a lower seal head 4, wherein a group of membrane main bodies 2 consisting of 2400 hollow fiber membrane filaments 1 are vertically arranged between the upper seal head 3 and the lower seal head 4. The diameter of a micropore for liquid to pass through of the hollow fiber membrane wire 1 is 0.4 mu m, the outer diameter of the hollow fiber membrane wire 1 is 1.65mm, the material is polyvinylidene fluoride, the two ends of the membrane main body 2 are cast in the upper end enclosure 3 and the lower end enclosure 4 by epoxy resin, and polyurethane is used for secondary casting to protect the root of the membrane main body 2. The periphery of the membrane main body 2 is also provided with a shell, the shell surrounds the membrane main body 2 and has a better constraint effect on gas-water two-phase flow generated by aeration. The side wall of the shell is provided with holes, but the number of the holes is less, and the area is smaller, so that the binding effect of the shell is not influenced.

The membrane main body 2 surrounds the gas distribution pipe 8 and is evenly divided into eight equal parts, and the cross-sectional area of the gas distribution pipe 8 is equal to that of one equal part. The gas distribution pipe 8 is also provided in the vertical direction in order to reduce the weight and tension borne by the membrane main body 2. The gas distribution pipe 8 is connected with the gas inlet pipe 6 and is isolated from the produced water collection chamber 7.

The air distribution holes 9 distributed on the air distribution pipe 8 are distributed more densely at the part close to the lower end enclosure 4, the orifices of the air distribution holes 9 close to the lower end enclosure 4 face the lower end enclosure 4 to wash out sludge accumulated at the bottom of the membrane main body 2, the air distribution holes 9 far away from the lower end enclosure 4 are uniformly distributed on the air distribution pipe 8, and the orifice direction is the horizontal direction. The diameters of all the air distribution holes 9 are 2mm, and the center distance between every two air distribution holes 9 in the same row is about 5 mm.

Referring to fig. 3 to 4, the upper head 3 and the lower head 4 of the hollow fiber curtain membrane module according to the present embodiment are partially enlarged. The whole appearance of upper cover 3 and lower head 4 is equilateral rectangle, the length of side is 320mm, upper cover 3 is inside to be equipped with to produce water and to collect room 7, membrane main part 2 is the trompil state in upper cover 3's the water collection room 7, is the closed state in lower head 4, be equipped with the water pipe 5 that produces that the external diameter is 15mm in upper cover 3 outside, produce water pipe 5 and upper cover 3 and be connected through quick connector, its inner chamber is linked together through producing water passageway 10 and the water collection room 7 of producing in the upper cover 3. The outside of upper cover 3 is equipped with the intake pipe 6 that the external diameter is 50mm, and intake pipe 6 passes through PVC glue adhesive connection with upper cover 3, and the 8 inner chambers of gas distribution pipe in 6 inner chambers of intake pipe and the upper cover 3 are connected.

For the membrane module, embodiment 1 of the present invention also provides a membrane bioreactor including the hollow fiber curtain membrane module of the MBR process.

For the membrane bioreactor, embodiment 1 of the present invention further provides a water treatment apparatus including the membrane bioreactor. Any apparatus comprising a membrane module having the specific structure of the present invention is within the scope of the present invention.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The hollow fiber curtain type membrane component for the MBR process is characterized by comprising a membrane main body consisting of a plurality of hollow fiber membrane filaments, wherein an upper end enclosure and a lower end enclosure are respectively installed at two ends of the membrane main body, a gas distribution pipe is communicated between the upper end enclosure and the lower end enclosure and is communicated with a gas inlet pipe arranged at the bottom of the membrane main body, and gas distribution holes for scouring the membrane main body are distributed in the gas distribution pipe.

2. The hollow fiber curtain membrane module as claimed in claim 1, wherein the gas distribution pipe is vertically disposed to bear the gravity and the pulling force of the lower head during the swing.

3. The hollow fiber curtain membrane module as claimed in claim 1, wherein the membrane body surrounds the gas distribution pipe to achieve an enlarged range of the gas distribution pipe to wash the membrane body.

4. The hollow fiber curtain membrane module as claimed in claim 1, wherein the membrane body surrounding the gas distribution pipe is equally divided into eight equal parts, and the cross-sectional area of the gas distribution pipe region is equal to the cross-sectional area of one of the equal parts.

5. The hollow fiber curtain membrane module as claimed in claim 1, wherein the air distribution holes are densely distributed in the area near the lower head, and the openings of the air distribution holes face the lower head to wash away the sludge near the bottom of the membrane body.

6. The hollow fiber curtain membrane module as claimed in claim 5, wherein the air distribution holes far from the lower head are loosely distributed, and the opening direction of the air distribution holes is along the horizontal direction.

7. The hollow fiber curtain membrane module as claimed in claim 1, further comprising a housing disposed at an outer side of the membrane main body to bind gas generated from the gas inlet pipe.

8. The hollow fiber curtain type membrane assembly as claimed in claim 1, wherein a water production collection chamber, a water production pipe and an air inlet pipe are arranged in the upper head, and the air inlet pipe is connected with the air distribution pipe.

9. A membrane bioreactor comprising the hollow fiber curtain membrane module of any one of claims 1-8 for use in an MBR process.

10. A water treatment apparatus comprising a membrane bioreactor according to claim 9.