Double-pressure column curtain type MBR (Membrane Bioreactor) membrane device

Abstract

The utility model discloses a double-pressure column curtain type MBR (Membrane Biological Reactor) membrane device which comprises a membrane shell with a containing cavity and an MBR membrane component positioned in the containing cavity, and a fluid circulation channel is formed between the peripheral surface of the MBR membrane component and the inner wall of the containing cavity; the MBR membrane assembly comprises an upper fixed end, a lower fixed end, a membrane wire arranged between the upper fixed end and the lower fixed end, and a water production end cover communicated with the interior of the membrane wire, a water inlet and an air inlet which are communicated with the accommodating cavity are formed in the lower end of the membrane shell, and a water production outlet pipe and an overflow port are respectively formed in the upper end of the membrane shell; the upper part of the produced water end cover is inserted into the produced water outlet pipe, and the lower fixed end head is detachably connected with the lower part in the accommodating cavity; according to the utility model, two water production modes of positive pressure and negative pressure can be cooperatively operated, the water production efficiency of the membrane module is greatly improved, the membrane module can be directly installed and used outside the flat ground, a new membrane pool is not needed for accommodating the membrane module, the construction period can be shortened, the civil engineering cost can be reduced, and in addition, the sewage disposal effect is better.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of water treatment, specifically relates to a double pressure column curtain formula MBR membrane device. BACKGROUND

[0002] In the field of sewage treatment and water resource recycling, MBR, also known as Membrane Bio-Reactor, is a water treatment technology combining activated sludge process and membrane separation technology. In the MBR system, the membrane assembly is used to replace the secondary sedimentation tank to achieve efficient and complete separation of sludge and water, which makes the sludge retention time and hydraulic retention time independent of each other, effectively increasing the sludge concentration in the biochemical tank and the accumulation of specific bacteria in the activated sludge, further increasing the rate of biochemical reaction.

[0003] In membrane technology, curtain formula MBR membrane assembly plays an increasingly important role in high-concentration sewage, with good and stable effluent water quality, which is affirmed by the majority of customers. Column curtain formula MBR membrane assembly in curtain formula MBR membrane assembly is more widely used, but in actual application, column curtain formula MBR membrane assembly still has the following problems in actual sewage treatment: (1) The conventional column curtain formula MBR membrane assembly on the market usually adopts the operation mode of pool arrangement and negative pressure suction, which requires high construction cost; (2) In order to ensure the maximum filling degree of the membrane filaments, the overall height of the assembly is slightly higher, which makes it easy for pollutants to accumulate on the surface of the membrane filaments, thereby affecting the operation stability of the entire system.

[0004] Chinese utility model CN215539885U discloses a column curtain formula MBR self-cleaning membrane assembly, which comprises an upper fixed end, a lower fixed end, a membrane filament arranged between the upper fixed end and the lower fixed end, a support fixed rod assembly for supporting the upper fixed end and the lower fixed end, a water production end cover, a first aeration mechanism arranged on the lower fixed end, the water production end cover being in communication with the inside of the membrane filament, the membrane assembly further comprising a second aeration mechanism arranged on the upper fixed end, the second aeration mechanism comprising an aeration air distribution pipe surrounding the upper end of the membrane filament and closed into a ring, an air inlet pipe and a plurality of air outlet pipes in communication with the aeration air distribution pipe, the extension direction of the air outlet pipes being parallel to the extension direction of the membrane filaments, and a plurality of aeration holes being formed on each air outlet pipe and facing the membrane filaments. Although this patent solves the problem of easy accumulation of pollutants on the membrane filaments to some extent, it needs to make major modifications to the existing column curtain formula MBR assembly, and still requires additional construction work during use, which is high in use cost and requires a large amount of aeration, resulting in high energy consumption of the fan. Utility Model Content

[0005] The purpose of this invention is to overcome one or more shortcomings of the prior art and provide an improved dual-pressure column curtain MBR membrane device, which can operate in both positive and negative pressure water production modes, greatly improving the water production efficiency of the membrane module. Moreover, it can be directly installed on flat ground without the need to build a new membrane tank to accommodate the membrane module, which can shorten the construction period and civil engineering costs of the entire system. In addition, it also has a better cleaning effect.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A column curtain type MBR membrane device includes a membrane shell forming a cavity, an MBR membrane module located within the cavity, and a fluid flow channel formed between the outer peripheral surface of the MBR membrane module and the inner wall of the cavity. The MBR membrane module includes an upper fixed end, a lower fixed end, membrane fibers disposed between the upper and lower fixed ends, and a permeate end cap communicating with the interior of the membrane fibers. The lower end of the membrane shell is provided with an inlet and an air inlet, both communicating with the cavity. The upper end of the membrane shell is provided with a permeate outlet pipe and an overflow port, respectively, and the overflow port is communicating with the cavity. The upper part of the permeate end cap is inserted into the permeate outlet pipe, and the lower fixed end is detachably connected to the lower part of the interior of the cavity.

[0008] According to some preferred aspects of the present invention, the column curtain type MBR membrane device further includes a support member with through holes, the support member being fixedly disposed in the lower part inside the cavity, and the lower fixed end being detachably connected to the support member.

[0009] In some embodiments of this utility model, the support member includes a support ring and a support leg for connecting the support ring to the inner wall of the cavity, the through hole is formed on the support ring, and the diameter of the support ring is smaller than the width of the cavity.

[0010] According to some specific aspects of this utility model, the material of the support ring and the material of the support leg are both polyvinyl chloride.

[0011] In some embodiments of this utility model, the support leg is heat-fused and welded to the inner wall of the cavity.

[0012] In some embodiments of this utility model, the support ring divides the cavity into an upper chamber and a lower chamber, the upper chamber including the fluid flow channel, and the bottom of the lower chamber having an outwardly convex arc-shaped surface.

[0013] In some embodiments of the utility model, the center line direction of the water inlet is perpendicular to the center line direction of the cavity, and the center line direction of the air inlet is parallel to the center line direction of the cavity.

[0014] In some embodiments of the utility model, the water inlet and the air inlet are respectively located below the lower fixed end.

[0015] In some embodiments of the utility model, the center line direction of the overflow port is parallel to the center line direction of the water inlet, and / or the upper portion of the water production end cover is interference fitted with the water outlet pipe.

[0016] In some embodiments of the utility model, the column curtain type MBR membrane device comprises a plurality of clamp copies, and the water inlet, the water outlet pipe and the overflow port are respectively provided with one clamp copy.

[0017] In some embodiments of the utility model, the membrane shell comprises an upper membrane shell, a middle membrane shell and a lower membrane shell, the upper membrane shell and the lower membrane shell are respectively detachably connected and communicated with the middle membrane shell, the water inlet and the air inlet are both arranged on the lower membrane shell, and the water outlet pipe and the overflow port are both arranged on the upper membrane shell.

[0018] In some embodiments of the utility model, the column curtain type MBR membrane device further comprises a water inlet pump and a water production suction pump, the water inlet pump is communicated with the water inlet, and the water production suction pump is communicated with the water outlet pipe.

[0019] Compared with the prior art, the utility model has the following advantages due to the above technical scheme:

[0020] The utility model discloses based on the low water production efficiency of current curtain type MBR membrane module, the higher civil cost that needs and the problem that pollutant is easy to accumulate, innovatively provides an improved double pressure column curtain type MBR membrane device, the device innovatively increases the membrane shell with the cavity, and the water production end cover of MBR membrane module is inserted in the water production outlet pipe of membrane shell, and the lower fixed end is fixed in the lower part of the inside of cavity, so that, make MBR membrane module can be fixed in the cavity, when the sewage is from the lower part and aeration, first, the sewage can exist in the inside and outside of MBR membrane module simultaneously, and the sewage of outside provides the positive pressure water production pressure of MBR membrane module, and the water production suction pump of MBR membrane module itself can provide negative pressure suction, and then make MBR membrane device can be positive pressure and negative pressure two water production mode coordinated operation, greatly improve the efficiency of membrane module water production, second, the setting of membrane shell makes MBR membrane module not need other equipment such as support frame to install and use, only needs to rely on membrane shell itself to realize fixed installation, for example can be directly externalized in flat ground installation and use, need not in the new membrane pool carries out membrane module containing, can shorten the construction period and civil cost of whole system, third, the upper and lower ends of MBR membrane module of the utility model are defined by membrane shell, that is, when the sewage is pumped in, the membrane filament will not displace or curl, when the air inlet aeration is combined, the bubbles produced by aeration will flow in the rising sewage and finally burst, the disturbance force produced by burst will greatly shake the membrane filament, especially the positive pressure of outside and the negative pressure of inside of membrane filament will make the pressure difference exist in the membrane filament, and then will give different forces to the sludge that is enriched or adhered on the membrane filament, is favorable to shake off the sludge, and the shaken sludge will be taken out from the overflow port in the process of rising sewage flow, realizes the self-cleaning effect of membrane filament, fourth, the air inlet aeration mode of the utility model belongs to in the relatively closed cavity, and the gas of aeration will all follow the sewage and move upwards, on the one hand, can realize the aeration function with small aeration loss (even almost no loss), on the other hand, compared with conventional open type aeration, the utility model can reduce the aeration amount in unit time or unit volume and obtain the effect equivalent to open type aeration, and then reduce the energy consumption of fan operation, save energy. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, below will be to the drawing needed to use in the embodiment or prior art description simple introduction, obviously, below description's drawing only is some embodiments of the utility model, for the ordinary skilled person in the art comes, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.

[0022] Figure 1 It is the structural schematic drawing of the column curtain type MBR membrane device in the embodiment of the utility model;

[0023] Figure 2 for Figure 1 enlarged view of A in FIG. 1;

[0024] Figure 3 for Figure 1 enlarged view of B in FIG. 1;

[0025] Figure 4 for

[0026] Figure 5 for

[0027] Figure 6 for

[0028] In the drawing: 100, membrane shell; 110, cavity; 111, fluid flow channel; 112, lower chamber; 1121, arc surface; 120, upper membrane shell; 130, middle membrane shell; 140, lower membrane shell; 121, water inlet; 122, air inlet; 131, water production outlet pipe; 132, overflow port; 140, support; 141, through hole; 142, support ring; 143, support leg; 200, MBR membrane module; 210, upper fixed end; 220, lower fixed end; 230, membrane wire; 240, water production end cover; 300, clamp; 400, bolt. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purpose, features and advantages of the present application more apparent, obvious and understandable, the present application will be described in detail below with reference to the drawings and specific embodiments. In the following description, a large number of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0030] In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly and specifically limited.

[0031] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be direct connection, also can pass through intermediate medium indirectly connect, can be two element internal communication or two element's mutual action relationship, unless another definite limitation.For the ordinary skill in the art, can understand the concrete meaning of the above terms in the utility model according to specific circumstances.

[0032] The preferred embodiments of the utility model are described in detail below with reference to the drawings.

[0033] Referring to Figures 1 to 6 The utility model provides a kind of post-curtain type MBR membrane device, the post-curtain type MBR membrane device includes the membrane shell 100 formed with containing cavity 110, MBR membrane module 200 in containing cavity 110, fluid flow passage 111 is formed between the outer circumferential surface of MBR membrane module 200 and the inner wall of containing cavity 110;MBR membrane module 200 includes upper fixed end head 210, lower fixed end head 220, membrane filament 230 being arranged between upper fixed end head 210 and lower fixed end head 220, water production end cover 240 being connected with the inside of membrane filament 230, the lower end of membrane shell 100 is provided with water inlet 121 and air inlet 122, which are all communicated with containing cavity 110, the upper end of membrane shell 100 is provided with water production outlet pipe 131 and overflow 132 respectively, and overflow 132 is communicated with containing cavity 110;The upper portion of water production end cover 240 is inserted in water production outlet pipe 131, and lower fixed end head 220 is detachably connected with the lower portion inside containing cavity 110.

[0034] In the example, the column curtain type MBR membrane device further comprises a support 140 with a through hole 141, the support 140 is fixedly arranged at the lower part of the inner cavity 110, and the lower fixed end 220 is detachably connected with the support 140, for example, can be detachably connected on the support 140 through bolts 400. Further, the support 140 comprises a support ring 142 and a support leg 143 for connecting the support ring 142 to the inner wall of the cavity 110, the through hole 141 is formed on the support ring 142, the diameter of the support ring 142 is smaller than the width of the cavity 110, and the support ring 142 and the support leg 143 can be integrally formed to constitute the support 140; the material of the support ring 142 and the material of the support leg 143 can be polyvinyl chloride (PVC), which is a polymer generated by free radical polymerization of vinyl chloride monomer (VCM), has the advantages of corrosion resistance, wear resistance, etc., and has small density and relatively light weight. In the actual operation process, the support leg 143 can be hot melt welded to the inner wall of the cavity 110, the support leg 143 is preferably arranged symmetrically in two or arranged at intervals in three directions respectively to achieve more favorable support of the membrane assembly, and the arrangement of the support leg 143 can basically not affect the passage of sewage, and has a certain flow disturbance effect. The support leg 143 can be arranged obliquely, which can better disturb the sewage and make the sewage have good dispersion flowability during rising, so as to avoid the occurrence of local deposition pollution; in addition, the support ring 142 with the through hole is arranged, on the one hand, it can have a guiding and shunting effect on the sewage entering the membrane assembly, increase the output efficiency of water production, on the other hand, the existence of the support ring 142 will change the pore size of fluid flow in the local part, and then make the sewage produce local flow rate difference during rising, which is beneficial to disperse and evenly flow the sewage to all directions, reduces the possibility of local sludge accumulation, and after the lower end of the MBR membrane assembly 200 is fixed, the rapidly rising sewage will not drive the membrane assembly to impact the inner wall of the chamber, which protects the operation stability and prolongs the service life.

[0035] In this example, the support ring 142 divides the cavity into an upper chamber and a lower chamber 112, the upper chamber includes a fluid flow channel 111, and the bottom of the lower chamber 112 has an outwardly convex arc surface 1121. The presence of the lower chamber 112 can provide sufficient mixing of the incoming sewage and aeration. The design of the arc surface can make the incoming sewage have an upward tangential force, which is beneficial for rapid upward movement and reduces long-term impact on the inner wall. Furthermore, it also provides a certain degree of turbulence effect, so that the incoming sewage collides with each other and moves upward together, reducing the possibility of sludge accumulation. Further, the center line direction of the water inlet 121 is perpendicular to the center line direction of the cavity 110, and the center line direction of the air inlet 122 is parallel to the center line direction of the cavity 110. The water inlet 121 and the air inlet 122 are respectively located below the lower fixed end 220, which is beneficial to uniformly mix the aeration and sewage in the initial stage, and further enables the bubbles generated by the aeration gas to be uniformly dispersed, thereby achieving more uniform aeration effect on the membrane filaments.

[0036] In this example, the center line direction of the overflow port 132 is parallel to the center line direction of the water inlet 121, and the upper part of the water outlet end cover 240 is in interference fit with the water outlet pipe 131. The interference fit can be achieved by the size of the pipe diameter, or by some gaskets to prevent sewage from leaking out.

[0037] In this example, the column curtain type MBR membrane device includes a plurality of clamp copy lines 300, and the water inlet 121, the water outlet pipe 131 and the overflow port 132 are respectively provided with a clamp copy line. The clamp copy line can be made of metal or plastic, which can provide a convenient disassembly connection structure and is beneficial for installation or connection operation.

[0038] In this example, the membrane shell includes an upper membrane shell 120, a middle membrane shell 130 and a lower membrane shell 140. The upper membrane shell 120 and the lower membrane shell 140 are respectively detachably connected and communicated with the middle membrane shell 130. The water inlet 121 and the air inlet 122 are arranged on the lower membrane shell 140, and the water outlet pipe 131 and the overflow port 132 are arranged on the upper membrane shell 120. By segmenting the membrane shell, it is beneficial for installation or transportation, and different functions can be integrated on different membrane shells, which is beneficial for processing. Furthermore, the segmented design is also beneficial for the installation of the MBR membrane assembly.

[0039] In this example, the column curtain type MBR membrane device further includes a water inlet pump and a water outlet suction pump. The water inlet pump is in communication with the water inlet, and the water outlet suction pump is in communication with the water outlet pipe.

[0040] When working: sewage is pumped from the water inlet, and aeration is carried out from the air inlet, air can be blown in, and the sewage flows upward, driving the bubbles generated by the aeration gas to flow (the bubbles can also rely on themselves to move upward), producing produced water inside the membrane wire, and the produced water is discharged outward through the produced water outlet pipe under the suction of the produced water pump, the sewage outside the membrane wire continues to flow upward and finally flows out through the overflow port, and in the process, due to the pressure difference between the inside and outside of the membrane wire, the production efficiency of the produced water will be greatly improved, and the sludge is not easy to accumulate in the membrane wire or the cavity.

[0041] In summary, the present application provides an improved double-pressure-column curtain type MBR membrane device based on the existing curtain type MBR membrane assembly, which has the problems of low water production efficiency, high construction cost, and easy accumulation of pollutants. The device innovatively adds a membrane shell with a cavity, and the produced water end cover of the MBR membrane assembly is inserted into the produced water outlet pipe of the membrane shell, and the lower fixed end is fixed to the lower part of the cavity. In this way, the MBR membrane assembly can be fixed in the cavity, and when sewage is pumped from the lower part and aeration is carried out, the first, sewage can exist on the inside and outside of the MBR membrane assembly at the same time, and the sewage on the outside provides positive pressure to the MBR membrane assembly. The produced water suction pump provided in the MBR membrane assembly can provide negative pressure suction, thereby enabling the MBR membrane device to operate in both positive pressure and negative pressure modes, greatly improving the efficiency of the membrane assembly in producing water. Second, the membrane shell of the present application enables the MBR membrane assembly to be installed and used without other equipment such as a support frame, and can be fixed and installed by relying on the membrane shell itself, such as being directly installed and used outside the flat ground, without the need for a new membrane pool to accommodate the membrane assembly, which can shorten the construction period and construction cost of the entire system. Third, the upper and lower ends of the MBR membrane assembly are limited by the membrane shell, that is, when the sewage is pumped in, the membrane wire will not displace or curl, and when the air inlet is aerated, the bubbles generated by the aeration will flow in the rising sewage and eventually burst, the disturbance force generated by the burst will greatly shake the membrane wire, especially the positive pressure on the outside and the negative pressure inside the membrane wire will cause a pressure difference between the inside and outside of the membrane wire, thereby exerting different forces on the sludge accumulated or adhered to the membrane wire, which is beneficial to the removal of the sludge. The sludge that is shaken off will be carried out from the overflow port during the upward flow of the rising sewage, achieving the self-cleaning effect of the membrane wire. Fourth, the air inlet aeration method of the present application is carried out in a relatively closed cavity, and the aeration gas will all move upward with the sewage. On the one hand, the aeration function can be achieved with a small amount of aeration loss (even almost no loss), and on the other hand, compared with conventional open aeration, the present application can reduce the aeration amount per unit time or unit volume and obtain the same effect as open aeration, thereby reducing the energy consumption of the fan operation and saving energy. For example, the conventional aeration coefficient is usually 0.2-0.3 m 3 / 2 The double pressure MBR membrane module has a smaller loss relative to the aeration loss, and the aeration coefficient is usually 0.1-0.15 m 3 / m 2 *h.

[0042] The above examples are only for illustrating the technical concept and characteristics of the utility model, and the purpose is to enable the person skilled in the art to understand the content of the utility model and implement it, and it cannot limit the protection scope of the utility model, and any equivalent changes or modifications according to the spirit and essence of the utility model shall be covered within the protection scope of the utility model.

Claims

1. A dual pressure column curtain MBR membrane device, characterized by, The double pressure column curtain type MBR membrane device comprises a membrane shell formed with a cavity, an MBR membrane assembly located in the cavity, and a fluid flow channel formed between the outer circumferential surface of the MBR membrane assembly and the inner wall of the cavity; the MBR membrane assembly comprises an upper fixed end, a lower fixed end, a membrane filament arranged between the upper fixed end and the lower fixed end, and a water production end cover in communication with the inside of the membrane filament; the lower end of the membrane shell is provided with a water inlet and an air inlet both in communication with the cavity; the upper end of the membrane shell is provided with a water outlet pipe and an overflow outlet respectively, and the overflow outlet is in communication with the cavity; the upper part of the water production end cover is inserted into the water outlet pipe, and the lower fixed end is detachably connected with the lower part of the inside of the cavity.

2. The dual pressure column curtain MBR membrane device of claim 1, wherein, The double pressure column curtain type MBR membrane device further comprises a support formed with a through hole, which is fixedly arranged at the lower part of the inside of the cavity, and the lower fixed end is detachably connected with the support.

3. The dual pressure column curtain MBR membrane device of claim 2, wherein, The support comprises a support ring and a support leg for connecting the support ring to the inner wall of the cavity, and the through hole is formed on the support ring, and the diameter of the support ring is smaller than the width of the cavity.

4. The dual pressure column curtain MBR membrane device of claim 3, wherein, The material of the support ring and the material of the support leg are both polyvinyl chloride.

5. The dual pressure column curtain MBR membrane device of claim 4, wherein, The support leg is hot-melt welded to the inner wall of the cavity.

6. The dual pressure column curtain MBR membrane device of claim 3, wherein, The support ring divides the cavity into an upper chamber and a lower chamber, the upper chamber comprises the fluid flow channel, and the bottom of the lower chamber has an outwardly protruding arc surface.

7. The dual pressure column curtain MBR membrane device of claim 1, wherein, The center line direction of the water inlet is perpendicular to the center line direction of the cavity, and the center line direction of the air inlet is parallel to the center line direction of the cavity; and / or the water inlet and the air inlet are respectively located below the lower fixed end.

8. The dual pressure column curtain MBR membrane device of claim 1, wherein, The center line direction of the overflow outlet is parallel to the center line direction of the water inlet; and / or the upper part of the water production end cover is in interference fit with the water outlet pipe.

9. The dual pressure column curtain MBR membrane device of claim 1, wherein, The double pressure column curtain type MBR membrane device further comprises a plurality of clamp copies, and one clamp copy is arranged for the water inlet, the water outlet pipe and the overflow outlet respectively; and / or the membrane shell comprises an upper membrane shell, a middle membrane shell and a lower membrane shell, the upper membrane shell and the lower membrane shell are detachably connected and communicated with the middle membrane shell, the water inlet and the air inlet are arranged on the lower membrane shell, and the water outlet pipe and the overflow outlet are arranged on the upper membrane shell.

10. The dual pressure column curtain MBR membrane device of claim 1, wherein, The double pressure column curtain type MBR membrane device further comprises a water inlet pump and a water production suction pump, the water inlet pump is in communication with the water inlet, and the water production suction pump is in communication with the water outlet pipe.

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