CN114620829A

CN114620829A - MABR membrane module

Info

Publication number: CN114620829A
Application number: CN202210196013.5A
Authority: CN
Inventors: 黄江益; 吴低潮; 王鑫臻
Original assignee: Zhejiang Jingyuan Membrane Technology Co ltd
Current assignee: Zhejiang Jingyuan Membrane Technology Co ltd
Priority date: 2022-03-01
Filing date: 2022-03-01
Publication date: 2022-06-14

Abstract

The invention belongs to the technical field of sewage purification treatment, and particularly relates to an MABR membrane component, which comprises: the upper membrane shell is used for air inlet; the lower membrane shell is used for large bubble aeration; the membrane assembly is arranged between the upper membrane shell and the lower membrane shell in a U shape and comprises an air inlet end and an air outlet end; the air guide pipeline is connected between the upper membrane shell and the lower membrane shell and is connected with the air outlet end; the air entering the upper membrane shell returns to the upper membrane shell after passing through the U-shaped membrane component, then enters the lower membrane shell through the air guide pipeline, and generates large-bubble aeration on the lower membrane shell to wash the membrane component. According to the invention, the membrane component is arranged in a U shape, so that the flow of oxygen in the membrane filaments is increased, and the oxygen utilization rate is improved; the oxygen passing through the membrane module can be input into the lower membrane shell by combining the gas guide pipeline, large-bubble aeration is generated on the lower membrane shell to wash out the biomembrane on the membrane module, the utilization rate of aeration kinetic energy is high, the whole power consumption is reduced, and the purification efficiency is improved.

Description

MABR membrane module

Technical Field

The invention belongs to the technical field of sewage purification treatment, and relates to an MABR membrane module.

Background

The Membrane Aeration Biomembrane Reactor (MABR) is a novel biological sewage treatment technology, has the characteristics of high oxygen mass transfer efficiency, anisotropic mass transfer of substrate oxygen and the like, and has obvious advantages in the aspects of efficient denitrification of sewage, energy conservation, consumption reduction, sludge reduction and the like.

The MABR carries out the mass transfer in a non-bubble aeration mode, oxygen permeates the membrane from the air side of the membrane, then is diffused to the sewage side, and carries out nitration reaction on the sewage side to form a nitrified microbial membrane layer, and ammonia nitrogen and organic matters in the biochemical tank carry out the mass transfer on the MABR membrane. Because the mass transfer rate of ammonia nitrogen in the water phase is higher, the ammonia nitrogen preferentially contacts with oxygen and generates a biological membrane mainly comprising nitrifying bacteria on the surface of the MABR membrane, the nitrification reaction and the denitrification reaction are synchronously carried out, and the reflux quantity in the nitrified liquid is reduced or saved.

The MABR membrane shell has some problems, firstly, the conventional series oxygen permeation-aeration mode has short membrane yarn stroke and low oxygen utilization rate; if the dead-end aeration MABR membrane component is adopted, 100% oxygen utilization rate can be obtained, however, the advantage of MABR selective permeation is lost, the biofilm thickness cannot be controlled at all, and extra power consumption is needed to be used as an aeration pipe; and secondly, the utilization rate of the kinetic energy of the gas in the traditional layout is generally low, bubbles pass through the membrane shells and cannot be uniformly distributed in the gaps of the membrane filaments, and finally, partial kinetic energy can be utilized only by depending on the limited swing of the membrane filaments.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides an MABR membrane component which can improve the utilization rate of oxygen and the utilization rate of kinetic energy and can perform large-bubble aeration.

In order to achieve the purpose, the invention adopts the following technical scheme:

an MABR membrane module comprising:

the upper membrane shell is used for air inlet;

the lower membrane shell is used for large bubble aeration;

the membrane assembly is arranged between the upper membrane shell and the lower membrane shell in a U shape and comprises an air inlet end and an air outlet end;

the air guide pipeline is connected between the upper membrane shell and the lower membrane shell and is connected with the air outlet end;

the air entering the upper membrane shell returns to the upper membrane shell after passing through the U-shaped membrane component, then enters the lower membrane shell through the air guide pipeline, and generates large-bubble aeration on the lower membrane shell to wash the membrane component.

The further technical scheme is as follows: the upper membrane shell comprises a cover plate, a guide plate and a bottom plate which are sequentially arranged from top to bottom, the center of the upper part of the cover plate is connected with an air inlet pipeline, and the guide plate is connected with the membrane component.

The further technical scheme is as follows: the flow guide plate comprises a plurality of air inlet sides and air outlet sides which are arranged at intervals, the air inlet end and the air outlet end of the membrane module are respectively arranged on the air inlet sides and the air outlet sides, and the air outlet sides are connected with the air guide pipeline.

The further technical scheme is as follows: and sealing layers are arranged at the joints of the air inlet end and the air inlet side and the joints of the air outlet end and the air outlet side.

The further technical scheme is as follows: the bottom plate is frame-shaped, one side of the bottom plate is provided with a bend, a closed cavity is formed between the bend part and the cover plate, the closed cavity is connected with the end part of the gas outlet side, and the gas guide pipeline is connected to the bottom of the cavity.

The further technical scheme is as follows: the lower membrane shell comprises a tensioning plate and an aeration plate, wherein the tensioning plate is arranged at the upper part of the aeration plate, and the membrane module is arranged on the tensioning plate.

The further technical scheme is as follows: the tensioning plate and the aeration plate are both grating plates, the middle part of the membrane module is wound on the tensioning plate and tensioned by the tensioning plate, and the lower end of the air guide pipeline penetrates through the aeration plate.

The further technical scheme is as follows: the membrane module comprises a plurality of hollow fiber membrane filaments which are arranged in a U shape.

The further technical scheme is as follows: and a throttle valve is arranged on the air guide pipeline.

The further technical scheme is as follows: and a support piece is arranged between the upper membrane shell and the lower membrane shell and is arranged at the four corners of the upper membrane shell and the lower membrane shell.

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

(1) the MABR membrane component provided by the invention has the advantages that the U-shaped membrane component is adopted, so that the flow of oxygen in membrane filaments is increased, and the oxygen utilization rate is improved; the oxygen passing through the membrane module can be input into the lower membrane shell by combining with the gas guide pipeline, large-bubble aeration is generated on the lower membrane shell, the biological membrane on the membrane module is washed, the utilization rate of aeration kinetic energy is high, and the overall power consumption is reduced; the aeration is carried out at the clearance of the membrane component, the aeration is uniform, and the effect is good.

(2) The upper membrane shell comprises a cover plate, a guide plate and a bottom plate, the center of the cover plate is connected with the air inlet pipeline, the guide plate is combined to uniformly distribute input gas, the uniform oxygen throughput in the membrane component is ensured, and the sewage treatment effect is improved.

(3) The guide plate comprises an air inlet side and an air outlet side which are arranged at intervals, the air inlet side and the air outlet side are respectively connected with an air inlet end and an air outlet end, and the joints of the air inlet side and the air outlet side are provided with sealant, so that air inlet and air outlet of the membrane module can be separated, oxygen is guaranteed to enter the membrane module first, and the oxygen utilization rate is guaranteed.

(4) The lower membrane shell comprises a tensioning plate and an aeration plate, the tensioning plate and the aeration plate are both grating plates, and the membrane component can be tensioned and fixed by the tensioning plate to ensure the treatment effect; the lower end of the air guide pipeline penetrates through the aeration plate, large bubble aeration can be formed on the aeration plate, a biological membrane generated on the membrane module is washed, the membrane module is prevented from being blocked, and the sewage treatment effect of the membrane module is ensured.

(5) The throttling valve is arranged on the air guide pipeline, so that the amount of gas entering the lower membrane shell through the air guide pipe can be adjusted through the throttling valve, the size of large bubble aeration is adjusted, and the thickness of the attached biological membrane on the membrane component is finally adjusted.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more apparent, the following detailed description will be given of preferred embodiments.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a cover plate according to an embodiment of the invention.

Fig. 3 is a schematic structural diagram of the upper membrane shell with the cover plate removed according to an embodiment of the present invention.

Fig. 4 is a partially enlarged schematic view of a portion a of fig. 3.

Fig. 5 is a schematic structural diagram of a baffle according to an embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a lower membrane shell according to a first embodiment of the invention.

Fig. 7 is a schematic structural view of an aeration plate according to a first embodiment of the present invention.

Fig. 8 is a schematic structural diagram of a second embodiment of the present invention.

The reference numbers in the figures: 100. coating a membrane shell; 110. a cover plate; 120. a baffle; 121. an air intake side; 122. a gas outlet side; 130. a base plate; 200. a lower membrane shell; 210. tensioning the plate; 220. An aeration plate; 300. a membrane module; 310. an air inlet end; 320. an air outlet end; 400. an air guide duct; 410. a throttle valve; 500. a support member; 600. a circulating water pipe; 700. a circulation pump; 800. an air inlet pipe.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The first embodiment is as follows:

as shown in fig. 1 to 7, an MABR membrane module includes:

an upper membrane housing 100 for intake air;

a lower membrane shell 200 for large bubble aeration;

the membrane module 300 is arranged between the upper membrane shell 100 and the lower membrane shell 200 in a U shape, and the membrane module 300 comprises a gas inlet end 310 and a gas outlet end 320;

the air guide pipeline 400 is connected between the upper membrane shell 100 and the lower membrane shell 200 and is connected with the air outlet end 320;

the air entering the upper membrane housing 100 returns to the upper membrane housing 100 after passing through the U-shaped membrane module 300, and then enters the lower membrane housing 200 through the air guide pipe 400, and generates large bubble aeration on the lower membrane housing 200 to flush the membrane module 300.

According to the MABR membrane module provided by the invention, the flow of oxygen in the membrane module 300 is increased through the U-shaped membrane module 300, so that the oxygen utilization rate is improved; the oxygen passing through the membrane module 300 can be input into the lower membrane shell 200 by combining the gas guide pipeline 400, large-bubble aeration is generated on the lower membrane shell 200, the aeration is generated at the gap of the membrane module 300, the biological membrane on the membrane module 300 is washed, the utilization rate of the aeration kinetic energy is high, and the whole power consumption is reduced.

Preferably, the upper membrane shell 100 comprises a cover plate 110, a baffle plate 120 and a bottom plate 130 which are arranged from top to bottom in sequence, an air inlet pipe is connected to the center of the upper part of the cover plate 110, and the baffle plate 120 is connected with the membrane module 300.

In this embodiment, the upper membrane housing 100 includes a cover plate 110, a baffle plate 120 and a bottom plate 130, the center of the cover plate 110 is connected to the inlet pipe, and the baffle plate 120 is combined to uniformly distribute the input gas, so as to ensure uniform oxygen throughput in the membrane module 300 and improve the sewage treatment effect.

Further preferably, the diversion plate 120 includes a plurality of air inlet sides 121 and air outlet sides 122 arranged at intervals, the air inlet end 310 and the air outlet end 320 of the membrane module 300 are respectively arranged on the air inlet side 121 and the air outlet side 122, and the air outlet side 122 is connected with the air guide duct 400.

Further preferably, the joints between the air inlet end 310 and the air inlet side 121 and between the air outlet end 320 and the air outlet side 122 are provided with sealing layers.

Specifically, in this embodiment, the plurality of air inlet ends 310 are fixed on the air inlet side 121 through structural adhesive (epoxy adhesive, polyurethane adhesive, silicone adhesive, and silica gel), the air outlet end 320 is connected with the air outlet side 121 through structural adhesive, the air outlet side 121 in this embodiment is in a strip shape and is converged at an end portion, and the air inlet ends 310 and the air inlet side 121, the air outlet end 320 and the air outlet side 122 form a sealing layer through bonding and hot melting.

Further preferably, the bottom plate 130 is frame-shaped, one side of the bottom plate 130 is provided with a bend, a closed cavity is formed between the bend and the cover plate 110, the closed cavity is connected with the end of the gas outlet side 122, and the gas guide duct 400 is connected with the bottom of the cavity.

In this embodiment, the flow guide plate 120 includes an air inlet side 121 and an air outlet side 122 that are arranged at an interval, the air inlet side 121 and the air outlet side 122 are respectively connected with an air inlet end 310 and an air outlet end 320, and the joints of the air inlet side 121 and the air outlet side 122 are both provided with sealant, so that air inlet and air outlet of the membrane module 300 can be separated, oxygen is ensured to enter the membrane module 300 first, and the utilization rate of the oxygen is improved.

In particular, the baffle 120 in this embodiment is disposed at the upper side of the closed chamber.

Preferably, the lower membrane housing 200 includes a tension plate 210 and an aeration plate 220, and the tension plate 210 is disposed on the upper portion of the aeration plate 220 and the membrane module 300 is disposed thereon.

The lower membrane housing 200 in this embodiment includes a tension plate 210 and an aeration plate 220, both the tension plate 210 and the aeration plate 220 are grating plates, and the tension plate 210 can tension and fix the membrane module 300 to ensure the treatment effect; the lower end of the air guide pipe 400 penetrates through the aeration plate 220, and meanwhile, the tensioning plate 210 is positioned above the aeration plate 220, so that large bubbles generated during aeration can be aerated in the gaps of the membrane modules to flush the biological membranes on the membrane modules 300, the membrane modules 300 are prevented from being blocked, and the sewage treatment effect of the membrane modules 300 is ensured.

Further preferably, the tensioning plate 210 and the aeration plate 220 are both grid plates, the middle part of the membrane module 300 is wound on the tensioning plate 210 and tensioned by the tensioning plate 210, and the lower end of the air guide duct 400 is arranged through the aeration plate 220.

Specifically, the grid on the tension plate 210 in this embodiment facilitates fixing the mold assembly 300, the grid on the aeration plate 220 facilitates forming air bubbles for aeration, and when the gas flow path on the aeration plate 220 has a long stroke, in order to ensure the aeration uniformity, a microporous rubber member needs to be installed on the aeration plate 220, and the aperture is 0.1-10 μm.

Preferably, the membrane module 300 includes a plurality of hollow fiber membrane filaments arranged in a "U" shape.

Preferably, a throttle valve 410 is provided on the air guide duct 400.

The air guide pipeline 400 in the embodiment is provided with the throttle valve 410, the amount of gas entering the lower membrane shell 300 through the air guide pipeline 400 can be adjusted through the throttle valve 410, the size of large bubble aeration is further adjusted, the scouring strength of the biological membrane is adjusted, and the thickness of the biological membrane is finally controlled and adjusted.

Preferably, a supporting member 500 is disposed between the upper membrane housing 100 and the lower membrane housing 200, and the supporting member 500 is disposed at four corners of the upper membrane housing 100 and the lower membrane housing 200.

Example two:

as shown in fig. 8, in order to test the performance of the module, three sets of control experiments were performed, wherein the zone B was a conventional aerobic tank, aeration was performed using an aeration tray, the zone C was a conventional MABR membrane module, the zone D was the MABR membrane module of the first embodiment, the zone B, the zone C, and the zone D were connected to a circulating water pipe 600 and an air inlet pipe 800, and the circulating water pipe 600 was provided with a circulating pump 700.

The conditions of the MABR film applied to the D region in this example were as follows: the outer diameter of each membrane wire of the multilayer composite cross-linked PC-PDMS-PTFE-PES membrane is 2.5mm, the total effective length of a single U-shaped membrane wire is 2m, the effective surface area of a single membrane shell is 105 square meters, and the size is 500 x 500 mm.

High ammonia nitrogen wastewater is adopted to enter a system for treatment, the retention time is 48 hours, the water circulation flow rate is 0.08m/s, comparative experiments are carried out on a zone B, a zone C and a zone D, the aeration quantity and the load of a unit membrane area are consistent, and the acclimation time is 8 days.

Under the conditions that the COD concentration of inlet water is 4200-5500 mg/L, the ammonia nitrogen concentration of inlet water is 500-600 mg/L and the total nitrogen is 500-600 mg/L, the COD and the ammonia nitrogen of produced water gradually decrease to be stable in the first 4 periods of the case, 10 periods are continuously detected after the stability, and the final results are shown in the table.

	Zone B	Region C	Region D
				Average COD removal Rate	38.2％	75.7％	84.3％
Average ammonia nitrogen removal	45.8％	78.5％	92.1％
				Average total nitrogen removal	0％	73.9％	86.9％

The comparison of the data shows that the average COD removal rate, the average ammonia nitrogen removal rate and the average total nitrogen removal rate of the MABR membrane module in the embodiment are obviously improved compared with those of the conventional aerobic tank and the conventional MABR membrane module.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

Moreover, descriptions of the present invention as relating to "first," "second," "a," etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating a number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. 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 "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; 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 addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Claims

1. An MABR membrane module, comprising:

an upper membrane shell (100) for air intake;

a lower membrane shell (200) for aeration of large bubbles;

the membrane assembly (300) is arranged between the upper membrane shell (100) and the lower membrane shell (200) in a U shape, and the membrane assembly (300) comprises an air inlet end (310) and an air outlet end (320);

the air guide pipeline (400) is connected between the upper membrane shell (100) and the lower membrane shell (200) and is connected with the air outlet end (320);

the air entering the upper membrane shell (100) returns to the upper membrane shell (100) after passing through the U-shaped membrane module (300), then enters the lower membrane shell (200) through the air guide pipeline (400), and generates large-bubble aeration on the lower membrane shell (200) to flush the membrane module (300).

2. An MABR membrane module according to claim 1, wherein said upper membrane shell (100) comprises a cover plate (110), a flow guide plate (120) and a bottom plate (130) arranged from top to bottom, the upper center of the cover plate (110) is connected with an inlet pipe, and the flow guide plate (120) is connected with the membrane module (300).

3. An MABR membrane module according to claim 2, wherein the flow guiding plate (120) comprises a plurality of spaced-apart inlet sides (121) and outlet sides (122), the inlet end (310) and the outlet end (320) of the membrane module (300) are respectively arranged on the inlet sides (121) and the outlet sides (122), and the outlet side (122) is connected with the air guiding duct (400).

4. An MABR membrane module according to claim 3, wherein the connection of said inlet end (310) to inlet side (121) and outlet end (320) to outlet side (122) is provided with a sealing layer.

5. An MABR membrane module according to claim 3, wherein said bottom plate (130) is frame shaped, one side of the bottom plate (130) is provided with a bend, a closed cavity is formed between the bend and the cover plate (110), the closed cavity is connected with the end of said gas outlet side (122), and said gas duct (400) is connected to the bottom of the cavity.

6. An MABR membrane module according to claim 1, wherein the lower membrane housing (200) comprises a tension plate (210) and an aeration plate (220), the tension plate (210) being arranged on the upper part of the aeration plate (220) and on which the membrane module (300) is arranged.

7. An MABR membrane module according to claim 6, wherein said tensioning plate (210) and aeration plate (220) are both grid plates, the middle part of membrane module (300) is wound on tensioning plate (210) and tensioned by tensioning plate (210), and the lower end of said air duct (400) is arranged through aeration plate (220).

8. An MABR membrane module according to claim 1, characterized in that the membrane module (300) comprises a plurality of hollow fiber membrane filaments arranged in a "U" shape.

9. An MABR membrane module according to claim 1, wherein said gas duct (400) is provided with a throttle valve (410).

10. An MABR membrane module according to claim 1, wherein support members (500) are arranged between the upper membrane shell (100) and the lower membrane shell (200), and the support members (500) are arranged at the four corners of the upper membrane shell (100) and the lower membrane shell (200).