CN114349159A - PTFE-based membrane bioreactor - Google Patents
PTFE-based membrane bioreactor Download PDFInfo
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- CN114349159A CN114349159A CN202111611731.6A CN202111611731A CN114349159A CN 114349159 A CN114349159 A CN 114349159A CN 202111611731 A CN202111611731 A CN 202111611731A CN 114349159 A CN114349159 A CN 114349159A
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- membrane
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- box body
- paint
- aeration
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention provides a PTFE-based membrane bioreactor, which comprises a membrane component and a membrane reactor; the membrane component comprises a PTFE membrane, and the membrane component is used for carrying out solid-liquid separation on the wastewater and the sludge; the membrane reactor comprises a box body, a membrane module mounting part and an aeration pipe; a membrane module is arranged on the membrane module mounting part; the box is provided with a connector, and the aeration pipe is communicated with the box through the connector. Compared with the prior art, the aeration pipe is arranged at the bottom of the box body in a bending mode, so that the aeration area is increased, the aeration efficiency is improved, and the pollution of the membrane component is reduced due to the design of the aeration pipe. The invention adopts the hydrophilic PTFE material, and has the advantages of pollution resistance, acid and alkali resistance, organic solvent resistance, high and low temperature resistance, high membrane flux and the like; the paint also has non-stick property and self-lubricating property, so that most pollutants are not easy to adhere to the surface of the film, and the paint has the advantages of super-strong pollution resistance, easy cleaning, low medicine consumption, low energy consumption and the like; higher pressure and aeration impact can be borne in the membrane application process, so that the treatment efficiency and effect of the process are improved.
Description
Technical Field
The invention relates to the technical field of sewage, in particular to a PTFE-based membrane bioreactor.
Background
Advanced treatment and recycling of sewage become essential means for human civilized development and guarantee of human drinking water safety, and related technologies are rapidly developing and paying attention. Among these techniques, membrane filtration techniques show increasing superiority. The Membrane Bioreactor (MBR) technology combining the membrane filtration technology and the biochemical treatment technology brings a brand new hope for sewage treatment and recycling.
MBR technology is a sewage treatment method combining traditional biological treatment technology and membrane filtration biological reaction liquid phase. The technical advantages are as follows: the effluent is filtered by a membrane, so that the water quality is better; all microorganisms are trapped in the bioreactor by membrane filtration, so that the efficiency of the bioreactor is greatly improved, some difficultly-degraded substances are degraded, and the occupied area of sewage treatment is reduced.
Due to the high-efficiency separation effect of the MBR membrane, the separation effect is far better than that of the traditional sedimentation tank, the treated effluent is extremely clear, suspended matters and turbidity are close to zero, and bacteria and viruses are greatly removed. Meanwhile, the membrane separation also enables microorganisms to be completely intercepted in the bioreactor, so that higher microorganism concentration can be maintained in the system, the integral removal efficiency of the reaction device on pollutants is improved, good effluent quality is ensured, meanwhile, the reactor has good adaptability to various changes of water inlet load (water quality and water quantity), and can stably obtain high-quality effluent quality.
At present, the common MBR membrane component is made of PVDF (polyvinylidene fluoride), the filter membrane of the MBR membrane component is made of an anti-pollution polyvinylidene fluoride material, the MBR membrane component has the characteristics of high filtration flux, high bacteria removal rate and the like, and has the most prominent advantages of oxidation resistance, resistance to oxidants such as sodium hypochlorite, chlorine dioxide, hydrogen peroxide and the like, and full inhibition of growth and reproduction of microorganisms. The PVDF filter membrane is not easy to block, has high pollutant interception quantity and large filtering area, is easy to clean, and can be periodically back-washed or air-scrubbed to remove the pollution blocking layer. Physical and chemical cleaning can reduce transmembrane pressure differences and restore normal flux under normal conditions.
PVDF has good anti-pollution characteristics, and physical and chemical cleaning can reduce transmembrane pressure difference and recover normal membrane flux under normal conditions, but particulate matters which contain oil in inlet water and are accumulated on the membrane surface and have certain particle sizes cannot be removed through water cleaning, air cleaning or relatively short chemical cleaning, so that the transmembrane pressure difference is gradually increased during normal operation, the water outlet amount is gradually reduced, the cleaning is more and more frequent, and finally, the membrane is blocked, and the MBR membrane has to be replaced. Such a drawback causes a considerable increase in investment in applying the MBR process, an increase in daily agent consumption, and a considerable increase in labor costs.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a PTFE-based membrane bioreactor.
The technical scheme of the invention is summarized as follows:
on one hand, the invention provides a PTFE-based membrane bioreactor, which comprises a membrane component and a membrane reactor;
the membrane component comprises a PTFE membrane, and the membrane component is used for carrying out solid-liquid separation on the wastewater and the sludge;
the membrane reactor comprises a box body, a membrane module mounting part and an aeration pipe;
the membrane assembly mounting part is used for mounting the membrane assembly;
the aeration pipe is positioned outside the box body, the box body is provided with a connecting port, and the aeration pipe is communicated with the box body through the connecting port.
Furthermore, the interior of the box body is sprayed with epoxy coal tar paint, the outer wall of the box body is coated with acrylic polyurethane paint, and the bottom of the box body is sprayed with epoxy zinc-rich paint.
Further, at least five channels of paint are coated inside the box body, and the coating thickness is 270-300 microns at intervals of 6 hours.
Furthermore, the outer wall of the box body is at least sprayed with four paint lines, each paint line is 8 hours apart, and the soil city thickness is 160-180 microns.
Further, the membrane module further comprises a support plate; the PTFE is located in a support plate.
Further, the support plate comprises a metal material and polyolefin resin and/or polyester resin; the metal material is wrapped by the polyolefin resin and/or the polyester resin.
Further, the PTFE membrane is subjected to plasma modification treatment, polyethylene PE is subjected to plasma polymerization on the surface of the PTFE membrane, and then AAc is subjected to graft polymerization on the surface of the PTFE membrane.
Further, the aeration pipe is an H-shaped aeration pipe, and the H-shaped aeration pipe is positioned at the bottom of the box body.
Furthermore, the aeration pipe is a bent aeration pipe, the bent aeration pipe is located at the bottom of the box body, and the bent aeration pipe covers the bottom of the box body.
Further, the membrane module installation department is located inside the box, just there are two membrane module installation departments, every the membrane module installation department is equipped with a plurality of mounting grooves, two mounting grooves on the membrane module installation department set up relatively, form the joint the storage space of membrane module, the membrane module is located in the storage space.
Compared with the prior art, the invention has the beneficial effects that: compared with the prior art which only adopts a frame type reactor, the membrane bioreactor based on PTFE provided by the invention has the advantages that the aeration pipe is arranged at the bottom of the box body in a bending way, the aeration area is increased, the aeration efficiency is improved, and the pollution of the membrane component is reduced due to the design of the aeration pipe. The invention adopts the hydrophilic PTFE material, and has the advantages of pollution resistance, acid and alkali resistance, organic solvent resistance, high and low temperature resistance, high membrane flux and the like; the paint also has non-stick property and self-lubricating property, so that most pollutants are not easy to adhere to the surface of the film, and the paint has the advantages of super-strong pollution resistance, easy cleaning, low medicine consumption, low energy consumption and the like; and the PTFE membrane has higher porosity, and a unique hydrophilic modification and renewable process are added, so that the PTFE membrane keeps an overlarge water flux and a minimum flux attenuation in the application life period. Higher pressure and aeration impact can be borne in the membrane application process, so that the treatment efficiency and effect of the process are improved.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic view of a PTFE-based membrane bioreactor of the present invention;
FIG. 2 is a schematic view of the invention at A in FIG. 1;
FIG. 3 is a schematic view of a membrane module according to an embodiment of the present invention;
FIG. 4 is a schematic view of a membrane module according to another embodiment of the present invention.
Reference numerals: 10. a membrane module; 11. a PTFE membrane; 12. a support plate; 21. a box body; 22. a membrane module mounting section; 221. mounting grooves; 222. a gap; 23. an aeration pipe.
Detailed Description
The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, which will enable those skilled in the art to practice the present invention with reference to the accompanying specification. In the drawings, the shape and size may be exaggerated for clarity, and the same reference numerals will be used throughout the drawings to designate the same or similar components. In the following description, terms such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, lower, and the like are used based on the orientation or positional relationship shown in the drawings. In particular, "height" corresponds to the dimension from top to bottom, "width" corresponds to the dimension from left to right, and "depth" corresponds to the dimension from front to back. These relative terms are for convenience of description and are not generally intended to require a particular orientation. Terms concerning attachments, coupling and the like (e.g., "connected" and "attached") refer to a relationship wherein structures are secured or attached, either directly or indirectly, to one another through intervening structures, as well as both movable or rigid attachments or relationships, unless expressly described otherwise.
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict. It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Referring to FIGS. 1-4, a PTFE-based membrane bioreactor of the present invention includes a membrane module 10 and a membrane reactor.
The membrane component 10 comprises a PTFE membrane, and the membrane component is used for carrying out solid-liquid separation on the wastewater and the sludge; the membrane reactor comprises a box body 21, a membrane module mounting part 22 and an aeration pipe 23; the membrane module mounting portion 22 is used for mounting the membrane module 10; the aeration pipe 23 is located outside the tank 21, and the tank is provided with a connection port, and the aeration pipe 23 is communicated with the tank 21 through the connection port.
Epoxy coal asphalt paint is sprayed inside the box body, acrylic polyurethane paint is coated on the outer wall of the box body, and epoxy zinc-rich paint is sprayed at the bottom of the box body. The defects and phenomena of sagging, impurities, missing coating and the like can not occur. Epoxy coal asphalt paint is added with long-life chlorosulfonated polyethylene rubber and mica iron oxide in epoxy coal asphalt paint, so that the epoxy coal asphalt paint has stronger corrosion resistance and is thick in one-step film forming.
Specifically, at least five coats of paint are painted inside the box body, and the coating thickness is 270-300 microns at intervals of 6 hours.
The outer wall of the box body is sprayed with at least four paint lines, each paint line is 8 hours apart, and the soil city thickness is 160-180 microns. Spraying and brushing methods can be used.
When the box body is produced, the raw materials are pretreated firstly, wherein the pretreatment comprises sand blasting, rust removal, primer spraying and the like, so that the stability of the box body is improved; then, carrying out material receiving, assembly and welding of the side plates and the bottom plate and assembly welding of the frame, then installing an equipment door and a hinge, and simultaneously carrying out cutting, welding, installation, detection, correction and flash and burr removal on parts in the container; treating splashing, burrs and the like in the welding process, and spraying a primer and a finish simultaneously. And finally, carrying out test acceptance and the like.
Specifically, the curb plate of box is the flute shape, and thickness is 4mm, and the bottom plate is dull and stereotyped to be strengthened, and thickness is 6mm, and the apron is 6 mm.
The aeration pipe 23 is an H-shaped aeration pipe, and the H-shaped aeration pipe is positioned at the bottom of the box body 21.
The aeration pipe 23 is a bent aeration pipe, the bent aeration pipe is located at the bottom of the box body 21, and the bent aeration pipe covers the bottom of the box body 21.
It can be understood that the aeration pipe 23 of the present invention is spirally arranged at the bottom of the box body 21 and is communicated with the box body 21 through a plurality of connecting ports to perform aeration and membrane flushing treatment on the membrane components in the box body, so as to improve the aeration efficiency and reduce the pollution of the membrane components.
The invention also comprises two membrane assembly mounting parts 22 which are positioned in the box body, wherein each membrane assembly mounting part is provided with a plurality of mounting grooves 221, the mounting grooves on the two membrane assembly mounting parts are oppositely arranged to form a containing space for clamping the membrane assembly, and the membrane assembly is positioned in the containing space.
The membrane module 10 includes a PTFE membrane 11, a support plate 12; the PTFE is located in the support plate. The PTFE membrane is used as a filtering membrane and is single-layer or multi-layer. The average thickness of each layer is 1-50 μm. The membrane aperture is 0.1-0.4 micron, the PH value is 0-14, the pure water flux of the membrane is 15-25L/m2/h, the outer skin and the inner reinforcing ribs of the membrane are simultaneously bonded with the epoxy glue, the membrane does not fall off, and the service life is more than or equal to 5 years. One or both sides of the PTFE membrane are lined with at least 1 support material.
In one embodiment, referring to fig. 3, the support plate 12 is a sheet material that surrounds the PTFE membrane 11 for supporting the PTFE membrane 11.
In another embodiment, referring to fig. 4, the support plate 12 is a plate material attached to both sides of the PTFE membrane 11 for supporting the PTFE membrane 11. The middle of the support plate 12 is hollow, which does not affect the filtering function.
Because the membrane module is used for filtering pollutants, the common metal plate can not meet the requirement of the PTFE membrane in the selection of the material of the supporting plate. The support plate comprises a metal material and polyolefin resin and/or polyester resin; the metal material is wrapped by the polyolefin resin and/or the polyester resin to provide enough supporting force for the PTFE membrane, so that the PTFE membrane is prevented from shaking in the aeration process to influence the aeration efficiency.
Preferably, the PTFE membrane of the present invention is plasma modified by plasma polymerization of Polyethylene (PE) on the surface of the PTFE membrane, followed by treatment of the membrane surface with graft polymerization of AAc to improve hydrophilicity.
It was found that the plasma treated PE-bearing film surface was able to further crosslink the AAc, indicating that the PE-deposited film surface had reactive groups. Has better hydrophilicity compared with the traditional PTFE membrane,
in addition, the aeration pipe 23 is arranged at the bottom of the invention for removing oil by aeration and removing oil stains on the hydrophilic PTFE film. Aiming at the problem that hydrophilic PTFE membranes can not remove oil as well as hydrophobic PTFE membranes, the invention provides an aeration oil-discharging method with bubble monitoring.
Specifically, a plurality of connectors are uniformly distributed on the spiral aeration pipe 23 and are communicated with the inside of the reactor through the plurality of connectors to aerate the membrane assembly and discharge oil. The connecting port is an openable connecting port.
A bubble detector (not shown) is mounted in the housing. The bubble detector may be mounted at the bottom or top of the tank. Through the bubble detector, the quantity of real time monitoring bubble, different quantity corresponds the connector of different quantity.
And determining the number of the opened connecting ports according to the current number of the bubbles so that the total volume of the bubbles in the reactor is 70 percent or more of the total volume.
It can be understood that the number of the connecting ports of the aeration pipes influences the number of the bubbles, so that the number of the aeration pipes is purposefully opened, the efficiency is ensured, and the energy is saved.
The number of the air bubbles which can be increased by each connecting port is obtained in advance, and the number of the connecting ports is increased according to the difference value between the current number of the air bubbles and the target number of the air bubbles. For example, when the volume of the air bubbles occupies 60% of the volume, 1 additional connection port is required to make the air bubbles 70%. The number of connection ports that needs to be increased at this time is 1. The method is ideal, and the number of the air bubbles which can be added to each connecting port is consistent.
Compared with the prior art which only adopts a frame type reactor, the membrane bioreactor based on PTFE provided by the invention has the advantages that the aeration pipe is arranged at the bottom of the box body in a bending way, the aeration area is increased, the aeration efficiency is improved, and the pollution of the membrane component is reduced due to the design of the aeration pipe. The invention adopts the hydrophilic PTFE material, and has the advantages of pollution resistance, acid and alkali resistance, organic solvent resistance, high and low temperature resistance, high membrane flux and the like; the paint also has non-stick property and self-lubricating property, so that most pollutants are not easy to adhere to the surface of the film, and the paint has the advantages of super-strong pollution resistance, easy cleaning, low medicine consumption, low energy consumption and the like; and the PTFE membrane has higher porosity, and a unique hydrophilic modification and renewable process are added, so that the PTFE membrane keeps an overlarge water flux and a minimum flux attenuation in the application life period. Higher pressure and aeration impact can be borne in the membrane application process, so that the treatment efficiency and effect of the process are improved.
The foregoing description has disclosed fully preferred embodiments of the present invention. It should be noted that those skilled in the art can make modifications to the embodiments of the present invention without departing from the scope of the appended claims. Accordingly, the scope of the appended claims is not to be limited to the specific embodiments described above.
Claims (10)
1. A PTFE-based membrane bioreactor is characterized by comprising a membrane component and a membrane reactor;
the membrane component comprises a PTFE membrane, and the membrane component is used for carrying out solid-liquid separation on the wastewater and the sludge;
the membrane reactor comprises a box body, a membrane module mounting part and an aeration pipe;
the membrane assembly mounting part is used for mounting the membrane assembly;
the aeration pipe is positioned outside the box body, the box body is provided with a connecting port, and the aeration pipe is communicated with the box body through the connecting port.
2. The PTFE-based membrane bioreactor of claim 1, wherein the interior of the tank is coated with epoxy coal tar paint, the outer wall is coated with acrylic polyurethane paint, and the bottom is coated with epoxy zinc-rich paint.
3. The PTFE-based membrane bioreactor of claim 2, wherein the interior of the housing is painted with at least five coats of paint at 6 hour intervals, the coating thickness being 270 and 300 microns.
4. The PTFE-based membrane bioreactor of claim 1, wherein the outer wall of the housing is coated with at least four coats of paint, each coat being 8 hours apart, and the bermudge thickness is 160 and 180 microns.
5. The PTFE-based membrane bioreactor of claim 1, wherein the membrane module further comprises a support plate; the PTFE is located in a support plate.
6. The PTFE-based membrane bioreactor according to claim 5, wherein said support plate comprises a metallic material and a polyolefin-based resin and/or a polyester-based resin; the metal material is wrapped by the polyolefin resin and/or the polyester resin.
7. The PTFE-based membrane bioreactor of claim 1, wherein the PTFE membrane is plasma-modified by plasma polymerization of Polyethylene (PE) on the surface of the PTFE membrane, and then the membrane surface is treated by graft polymerization of AAc.
8. The PTFE-based membrane bioreactor of claim 1, wherein the aerator tube is an H-shaped aerator tube, the H-shaped aerator tube being located at the bottom of the tank.
9. The PTFE-based membrane bioreactor of claim 1, wherein the aerator pipe is a bent aerator pipe, the bent aerator pipe is located at the bottom of the tank, and the bent aerator pipe covers the bottom of the tank.
10. The PTFE-based membrane bioreactor of claim 1, wherein the membrane assembly mounting part is located inside the tank body, and there are two membrane assembly mounting parts, each membrane assembly mounting part is provided with a plurality of mounting grooves, the mounting grooves on the two membrane assembly mounting parts are oppositely arranged to form a receiving space for clamping the membrane assembly, and the membrane assembly is located in the receiving space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111611731.6A CN114349159A (en) | 2021-12-27 | 2021-12-27 | PTFE-based membrane bioreactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111611731.6A CN114349159A (en) | 2021-12-27 | 2021-12-27 | PTFE-based membrane bioreactor |
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| Publication Number | Publication Date |
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| CN114349159A true CN114349159A (en) | 2022-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111611731.6A Withdrawn CN114349159A (en) | 2021-12-27 | 2021-12-27 | PTFE-based membrane bioreactor |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120111784A1 (en) * | 2009-07-10 | 2012-05-10 | Sumitomo Electric Fine Polymer, Inc. | Filtration purpose flat-membrane element, flat-membrane-type separation membrane module, and filtration apparatus |
| CN206109042U (en) * | 2016-08-31 | 2017-04-19 | 深圳盖雅环境科技有限公司 | Membrane bioreactor |
| CN209493371U (en) * | 2018-09-21 | 2019-10-15 | 苏州苏科环保科技有限公司 | A kind of integral type large size MBR film group device |
-
2021
- 2021-12-27 CN CN202111611731.6A patent/CN114349159A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120111784A1 (en) * | 2009-07-10 | 2012-05-10 | Sumitomo Electric Fine Polymer, Inc. | Filtration purpose flat-membrane element, flat-membrane-type separation membrane module, and filtration apparatus |
| CN206109042U (en) * | 2016-08-31 | 2017-04-19 | 深圳盖雅环境科技有限公司 | Membrane bioreactor |
| CN209493371U (en) * | 2018-09-21 | 2019-10-15 | 苏州苏科环保科技有限公司 | A kind of integral type large size MBR film group device |
Non-Patent Citations (1)
| Title |
|---|
| 周明等: "Ar等离子体对聚四氟乙烯中空纤维膜的亲水改性", 《广州化工》 * |
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