CN112830557A - Electrochemical membrane filtering device based on titanium fiber composite electrode and water treatment method thereof - Google Patents
Electrochemical membrane filtering device based on titanium fiber composite electrode and water treatment method thereof Download PDFInfo
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- CN112830557A CN112830557A CN202110014256.8A CN202110014256A CN112830557A CN 112830557 A CN112830557 A CN 112830557A CN 202110014256 A CN202110014256 A CN 202110014256A CN 112830557 A CN112830557 A CN 112830557A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
Abstract
The invention provides an electrochemical membrane filtering device based on a titanium fiber composite electrode and a water treatment method thereof, wherein the electrochemical membrane filtering device comprises: the device comprises a cavity (1), a hollow fiber membrane (2), a titanium fiber composite anode (3) and a titanium fiber composite cathode (4); the hollow fiber membrane (2) is arranged in the center of the cavity (1), the titanium fiber composite anode (3) is spirally wound on the outer wall of the hollow fiber membrane (2), and the titanium fiber composite cathode (4) is spirally attached to the inner wall of the hollow fiber membrane (2); the membrane wall of the hollow fiber membrane (2) is used as an electrode separation material for avoiding short circuit; be provided with water inlet (5) and delivery port (6) on the lateral wall of cavity (1) respectively for let in and discharge the water of treating the filtration, the top and the bottom of cavity (1) are passed through the pipeline respectively at the both ends of hollow fiber membrane (2), make the inside of hollow fiber membrane (2) directly communicate with the outside, and this device can show ground reduce cost, promotes the utilization ratio of electrode quality.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to an electrochemical membrane filtering device based on a titanium fiber composite electrode and a water treatment method thereof.
Background
In recent years, electro-filtration technology has received much attention in the field of water treatment technology. Because the technology fully couples electrochemistry and a filtering technology, especially fully utilizes the forced convection effect in the filtering process to continuously transmit pollutants to the surface of the electrode, the problem of mass transfer limitation of the electrode is obviously reduced, and the current efficiency and the oxidation efficiency of an electrochemical system are improved. Based on the above techniques, many novel conductive film materials based on water treatment film substrates have been developed, among themMainly comprises organic or inorganic membrane material which takes carbon material as main conductive layer. Vecitis et al at Harvard university developed a membrane material of a graphene + carbon nanotube composite conductive layer, and many research teams at home and abroad uniformly coated the carbon nanotubes or graphene coating on the surface of a membrane substrate by using a vacuum filtration method, and have obtained many results in succession. However, since the carbon material has the characteristics of low oxygen evolution potential and weak oxidation, a scholarly further loads SnO with high oxygen evolution potential on the surface of the carbon material2Although the oxidizability of oxidants such as-Sb is improved, the carbon-based material still has the problems of easy oxidation, electrode failure and the like under high potential. More importantly, the problems of unstable structure, easy falling off, failure of the conductive layer and the like still exist in the conventional carbon-based conductive layer and film substrate under long-time operation, and the challenge is provided for large-scale long-term stable operation of an electric filtration system.
In addition to coating carbon-based conductive materials on the surface of the membrane substrate, there are also researchers who directly combine the electrochemical module with the membrane module (CN201910118009.5, CN201710864744.1), and place the electrochemical module (electrode plate) in or after the membrane system to enhance the anti-pollution capability or enhance the decontamination performance of the membrane system. However, the electrode material and the membrane material belong to mutually independent structures, and potentials of in-situ oxidation removal of oxide on the membrane surface by electrochemical oxidation, mass transfer enhancement on the electrode surface by membrane filtration and the like are not effectively exerted. Especially, the hollow fiber membrane is the preferred membrane configuration for household water treatment systems and wastewater treatment projects due to the characteristics of high flux and high surface area ratio.
Therefore, how to design an electrochemical filtration system suitable for hollow fiber membrane materials, on the premise of not changing the original membrane materials, a novel electrode material (with an open structure, excellent mass transfer and high surface area ratio) is effectively combined with the hollow fiber membrane, so that the efficient removal of pollutants on the surface of the membrane and the in-situ cleaning of membrane pollution are realized, meanwhile, a micro chemical reactor is formed by utilizing membrane wires, the high current efficiency and low energy consumption are realized, the cost is low, and the preparation can be amplified, and the electrochemical filtration system has important significance for the development of an electric filtration technology.
Disclosure of Invention
The invention provides an electrochemical membrane filtering device based on a titanium fiber composite electrode and a water treatment method thereof, aiming at solving the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme.
An electrochemical membrane filtration device based on a titanium fiber composite electrode, comprising:
the device comprises a cavity (1), a hollow fiber membrane (2), a titanium fiber composite anode (3) and a titanium fiber composite cathode (4);
the hollow fiber membrane (2) is arranged in the center of the cavity (1), the titanium fiber composite anode (3) is spirally wound on the outer wall of the hollow fiber membrane (2), and the titanium fiber composite cathode (4) is spirally attached to the inner wall of the hollow fiber membrane (2); the membrane wall of the hollow fiber membrane (2) is used as an electrode separation material between the titanium fiber composite cathode (4) and the titanium fiber composite anode (3) for avoiding short circuit;
the water filter is characterized in that a water inlet (5) and a water outlet (6) are respectively formed in the side wall of the cavity (1) and used for introducing and discharging water to be filtered, and the two ends of the hollow fiber membrane (2) penetrate through the top end and the bottom end of the cavity (1) through pipelines respectively, so that the inside of the hollow fiber membrane (2) is directly communicated with the outside and used as a water outlet (7) for producing water, and the filtered water is discharged.
Preferably, the water inlet (5) and the water outlet (6) are respectively positioned at the bottom end and the top end of the side wall of the cavity (1).
Preferably, the titanium fiber composite anode (3) comprises a titanium fiber matrix, a micro-nano structure Ti surface layer, a metal oxide catalyst layer and a super-hydrophobic coating from inside to outside;
the titanium fiber composite cathode (4) comprises a titanium fiber matrix, a micro-nano structure Ti surface layer, a metal oxide catalyst layer, a conductive coating and a super-hydrophobic coating from inside to outside;
or the titanium fiber composite cathode (4) comprises a titanium fiber matrix, a micro-nano structure Ti surface layer, a conductive coating and a super-hydrophobic coating from inside to outside;
or the titanium fiber composite cathode (4) comprises a titanium fiber matrix, a micro-nano structure Ti surface layer, a metal oxide catalyst layer and a super-hydrophobic coating from inside to outside.
Preferably, the titanium fiber matrix is a Ti or Ti alloy filamentous fiber material; the micro-nano structure Ti surface layer is a Ti metal surface layer with micron columns or micron pits growing on the titanium fiber substrate;
the metal oxide catalyst layer is formed by loading any one oxide of Ti, Mn, Ce, Ni, Co, Cu, Zn, Fe, Sn, Sb, Pb, Ir and Ru on a micro-nano structure Ti surface layer;
or the metal oxide catalyst layer is a composite oxide which loads two or more of Ti, Mn, Ce, Ni, Co, Cu, Zn, Fe, Sn, Sb, Pb, Ir and Ru on the micro-nano configuration Ti surface layer.
Preferably, the metal oxide catalyst layer is in a nanowire, nanorod or nanocone structure.
Preferably, the material of the hollow fiber membrane is one of PAN, PVC, PES, PP, PS, PVDF, PTFE, and inorganic ceramic.
Preferably, the diameter of the titanium fiber composite anode (3) ranges from 0.01mm to 1mm, and the diameter of the titanium fiber composite cathode (4) ranges from 0.01mm to 1 mm.
Preferably, the super-hydrophobic coating is a polytetrafluoroethylene coating or a fluorosilane coating; the conductive coating is composed of one or more of graphene, oxidized graphene, redox graphene, fullerene, nitrogen-doped and sulfur-doped graphene, nitrogen-doped and sulfur-doped oxidized graphene, nitrogen-doped and sulfur-doped redox graphene, and nitrogen-doped and sulfur-doped fullerene.
The embodiment of the invention also provides a water treatment method of the electrochemical membrane filtering device based on the titanium fiber composite electrode, which comprises the following steps:
taking a titanium fiber composite electrode as an anode and a cathode, and respectively winding the titanium fiber composite electrode spirally on the outer wall and the inner wall of the hollow fiber membrane (2);
under certain operation pressure, introducing wastewater into the cavity from the water inlet (5) and flowing out from the water outlet (6) in a cross flow manner, wherein the wastewater penetrates through the membrane body from the outer wall of the hollow fiber membrane (2) and enters the hollow fiber membrane, and produced water is discharged through the water outlet (7) communicated with the inner wall of the hollow fiber membrane (2);
in the filtering process, constant current is applied between the titanium fiber composite anode and the titanium fiber composite anode through a direct current stabilized voltage power supply, pollutants on the surface of the hollow fiber membrane are removed through electrochemical oxidation, and simultaneously generated gas is used for ensuring the surface of the hollow fiber membrane to be clean.
Preferably, the water treatment method further comprises:
in the back washing stage:
clear water is introduced from a water outlet (7), enters the cavity (1) through the hollow fiber membrane (2), and is finally discharged from a water inlet (5) and a water outlet (6);
air-water backwashing stage:
the gas-water mixed liquid is introduced from the water inlet (5) and fully contacts with the membrane filaments of the hollow fiber membrane (2), impurities on the surface of the hollow fiber membrane are removed, and the removed dirty water is discharged from the water outlet (6) in a cross flow manner.
According to the technical scheme provided by the electrochemical membrane filtering device based on the titanium fiber composite electrode and the water treatment method thereof, the electrode has the following beneficial effects:
1) the electrochemical membrane filtering device of the titanium fiber composite electrode of the embodiment of the invention has the characteristics of high surface area ratio, large specific mass electrode area, small electrode spacing, high current efficiency and low energy consumption:
because the device adopts the titanium fiber composite electrode, the high surface area ratio characteristic of the titanium fiber can obtain more surface area in a limited space, especially when the actual diameter of the titanium fiber is less than hundreds of microns, not only can obviously reduce the quality of the electrode and the quality of the electrode substrate for conducting, but also can provide sufficient catalytic area, thereby obtaining higher specific mass electrode area, the titanium fiber composite electrode related in the device has special microscopic interface, meanwhile, the hollow fiber membrane has a three-dimensional open structure, can be effectively coupled to the inner hole and the outer wall of the hollow fiber membrane, and can be used as a cathode and anode separation material by utilizing the thickness of the hollow fiber membrane, the spacing between the cathode and the anode can be controlled below millimeter level, so that the electrochemical reaction under the ultra-low electrode spacing can be efficiently carried out, the energy consumption investment is greatly reduced, and the utilization rate of the electrodes is remarkably improved;
2) the mass transfer effect is good, and the electric filtering system is convenient to assemble:
because the distance between the cathode and the anode is smaller than millimeter level and the forced convection action of the hollow fiber membrane, pollutants can be continuously transmitted to the surface of the electrode, thereby remarkably reducing the mass transfer limit of the surface of the electrode; meanwhile, due to the spiral winding mode of the fiber composite electrode, the area of the electrode covering membrane filaments can be effectively regulated and controlled; in addition, due to the open structure of the fiber composite electrode, the hollow fiber membrane filtration pressure difference and pollutant mass transfer cannot be influenced. The titanium fiber composite electrode and the hollow fiber membrane are relatively independent, and only the titanium fiber composite electrode needs to be assembled inside and outside the commercial hollow fiber membrane, so that the design is convenient to install and disassemble, the interface of the hollow fiber membrane does not need to be subjected to conductive modification treatment, and the assembly is easy;
3) excellent electrocatalysis performance, long service life, higher active area than electrode mass, low cost per unit electrode mass:
by constructing a three-layer composite structure of a micro-nano metal surface layer, a nano metal oxide catalyst layer and a surface modification layer on a titanium fiber substrate, the electrode interface characteristics suitable for different scenes can be realized, a hierarchical structure with a composite microstructure and a nano structure is further formed, more reaction sites are provided, and the interface mass transfer of pollutants is enhanced; meanwhile, a three-layer protection system with a microstructure, a nano structure and a modified protection layer is formed on the electrode substrate, so that the substrate can be uniformly loaded with an electrocatalyst, and the exposure and corrosion of the metal substrate are reduced; the mass transfer effect is improved due to the improvement of the surface area ratio, so that the applied current density is reduced to a certain extent, and the service life of the electrode is prolonged from another layer;
4) active area (active area m) due to specific mass2The electrode mass g) is greatly improved, the actual investment of the electrode is obviously reduced, the utilization rate of the electrode mass is improved, and the possibility is provided for large-scale application of the electrode.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart illustrating a resource management method in a multimedia communication system according to an embodiment of the present invention;
description of reference numerals:
1 cavity, 2 hollow fiber membranes, 3 titanium fiber composite anode, 4 titanium fiber composite cathode, 5 water inlet, 6 water outlet and 7 produced water outlet
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
For the convenience of understanding of the embodiments of the present invention, the following description will be further explained by taking several specific embodiments as examples with reference to the drawings, and the embodiments of the present invention are not limited thereto.
Example 1
Fig. 1 is a schematic diagram of an electrochemical membrane filtration device based on a titanium fiber composite electrode according to this embodiment, and referring to fig. 1, the device includes a cavity (1), a hollow fiber membrane (2), a titanium fiber composite anode (3), and a titanium fiber composite cathode (4).
The hollow fiber membrane (2) is arranged in the center of the cavity (1), the titanium fiber composite anode (3) is spirally wound on the outer wall of the hollow fiber membrane (2), and the titanium fiber composite cathode (4) is spirally attached to the inner wall of the hollow fiber membrane (2); the membrane wall of the hollow fiber membrane (2) is used as an electrode separation material between the titanium fiber composite cathode (4) and the titanium fiber composite anode (3) for avoiding short circuit;
be provided with water inlet (5) and delivery port (6) on the lateral wall of cavity (1) respectively for let in and discharge the water of treating filtering, the top and the bottom of cavity (1) are passed through the pipeline respectively at the both ends of hollow fiber membrane (2), make the inside of hollow fiber membrane (2) directly communicate with the outside, be used for as output mouth of a river (7), the log raft after will filtering is discharged.
The water inlet (5) and the water outlet (6) are respectively positioned at the bottom end and the top end of the side wall of the cavity (1).
The titanium fiber composite anode (3) comprises a titanium fiber matrix, a micro-nano structure Ti surface layer, a metal oxide catalyst layer and a super-hydrophobic coating from inside to outside;
the titanium fiber composite cathode (4) comprises a titanium fiber matrix, a micro-nano structure Ti surface layer, a metal oxide catalyst layer, a conductive coating and a super-hydrophobic coating from inside to outside;
or the titanium fiber composite cathode (4) comprises a titanium fiber matrix, a micro-nano structure Ti surface layer, a conductive coating and a super-hydrophobic coating from inside to outside;
or the titanium fiber composite cathode (4) comprises a titanium fiber matrix, a micro-nano structure Ti surface layer, a metal oxide catalyst layer and a super-hydrophobic coating from inside to outside.
Wherein the titanium fiber matrix is a Ti or Ti alloy filiform fiber material; the micro-nano structure Ti surface layer is a Ti metal surface layer with micron columns or micron pits growing on a titanium fiber substrate; the metal oxide catalyst layer is formed by loading any one oxide of Ti, Mn, Ce, Ni, Co, Cu, Zn, Fe, Sn, Sb, Pb, Ir and Ru on a micro-nano structure Ti surface layer;
or the metal oxide catalyst layer is a composite oxide which loads two or more of Ti, Mn, Ce, Ni, Co, Cu, Zn, Fe, Sn, Sb, Pb, Ir and Ru on the micro-nano configuration Ti surface layer.
The super-hydrophobic coating is a polytetrafluoroethylene coating or a fluorosilane coating; the conductive coating is composed of one or more of graphene, graphene oxide, redox graphene, fullerene, nitrogen-doped and sulfur-doped graphene oxide, nitrogen-doped and sulfur-doped redox graphene and nitrogen-doped and sulfur-doped fullerene.
The metal oxide catalyst layer is in a nanowire, nanorod or nanocone structure.
The diameter range of the titanium fiber composite anode (3) is 0.01 mm-1 mm.
The diameter range of the titanium fiber composite cathode (4) is 0.01 mm-1 mm.
Schematically, the titanium fiber composite anode in the embodiment comprises a titanium fiber substrate with the diameter of 0.2mm, a micron column Ti surface layer and nano TiO2-SnO2The nano-wire array catalyst layer and the super-hydrophobic coating are fluorosilane coatings; the titanium fiber composite cathode comprises a titanium fiber substrate with the diameter of 0.1mm, a micron pit Ti surface layer and nano TiO2Nanowire array catalysis layer, graphite alkene conducting layer (conductive coating).
The hollow fiber membrane is made of one of PAN (polyacrylonitrile), PVC (polyvinyl chloride), PES (polyether sulfone), PP (polypropylene), PS (polysulfone), PVDF (polyvinylidene fluoride), PTFE (polytetrafluoroethylene) and inorganic ceramics. The hollow fiber membrane is a single membrane filament or a membrane component consisting of single membrane filaments. The hollow fiber membrane of the present embodiment is a single membrane filament made of PTFE (polytetrafluoroethylene).
The water treatment method of the electrochemical membrane filtration device applying the titanium fiber composite electrode comprises the following steps:
taking a titanium fiber composite electrode as an anode and a cathode, and respectively winding the titanium fiber composite electrode spirally on the outer wall and the inner wall of the hollow fiber membrane (2);
under certain operation pressure, introducing wastewater into the cavity from the water inlet (5) and flowing out from the water outlet (6) in a cross flow manner, wherein the wastewater penetrates through the membrane body from the outer wall of the hollow fiber membrane (2) and enters the hollow fiber membrane, and produced water is discharged through the water outlet (7) communicated with the inner wall of the hollow fiber membrane (2);
in the filtering process, constant current is applied between the titanium fiber composite anode and the titanium fiber composite anode through a direct current stabilized voltage power supply, pollutants on the surface of the hollow fiber membrane are removed through electrochemical oxidation, and simultaneously generated gas is used for ensuring the surface of the hollow fiber membrane to be clean.
In the back washing stage:
clear water is introduced from a water outlet (7), enters the cavity (1) through the hollow fiber membrane (2), and is finally discharged from a water inlet (5) and a water outlet (6);
air-water backwashing stage:
the gas-water mixed liquid is introduced from the water inlet (5) and fully contacts with the membrane filaments of the hollow fiber membrane (2), impurities on the surface of the hollow fiber membrane are removed, and the removed dirty water is discharged from the water outlet (6) in a cross flow manner.
Example 2
The embodiment provides an electrochemical membrane filtering device based on a titanium fiber composite electrode, which comprises a cavity, a hollow fiber membrane, a titanium fiber composite anode and a titanium fiber composite cathode.
The hollow fiber membrane is arranged in the center of the cavity, the titanium fiber composite anode is spirally wound on the outer wall of the hollow fiber membrane, and the titanium fiber composite cathode is spirally attached to the inner wall of the hollow fiber membrane; the membrane wall of the hollow fiber membrane is used as an electrode separation material between the titanium fiber composite cathode and the titanium fiber composite anode and is used for avoiding short circuit;
the side wall of the cavity is respectively provided with a water inlet and a water outlet for introducing and discharging water to be filtered, and the two ends of the hollow fiber membrane respectively pass through the top end and the bottom end of the cavity through pipelines, so that the inside of the hollow fiber membrane is directly communicated with the outside and is used as an output water port for discharging the filtered water.
The water inlet and the water outlet are respectively positioned at the bottom end and the top end of the side wall of the cavity.
The titanium fiber composite anode comprises a titanium fiber substrate with the diameter of 0.1mm, a micron pit Ti surface layer and nano TiO2The nano-rod array catalyst layer and the super-hydrophobic coating are fluorosilane coatings; the titanium fiber composite cathode comprises a titanium fiber substrate with the diameter of 0.2mm, a micron column Ti surface layer and nano TiO2-SnO2A nanorod array catalyst layer and a nitrogen-doped redox graphene conductive layer; the hollow fiber membrane of the present example is a membrane module made of PVDF (polyvinylidene fluoride), and the number of membrane filaments is 20.
It will be appreciated by those skilled in the art that the foregoing is illustrative only, and that other types of applications, whether presently existing or later to be developed, that may be suitable for use with the embodiments of the present invention, are also encompassed within the scope of the present invention and are hereby incorporated by reference.
It will be appreciated by those skilled in the art that the number of various components shown in FIG. 1 for simplicity only may be less than that in an actual device, but such omissions are clearly not to be considered as a requirement for a clear and complete disclosure of embodiments of the invention.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An electrochemical membrane filtration device based on a titanium fiber composite electrode, comprising:
the device comprises a cavity (1), a hollow fiber membrane (2), a titanium fiber composite anode (3) and a titanium fiber composite cathode (4);
the hollow fiber membrane (2) is arranged in the center of the cavity (1), the titanium fiber composite anode (3) is spirally wound on the outer wall of the hollow fiber membrane (2), and the titanium fiber composite cathode (4) is spirally attached to the inner wall of the hollow fiber membrane (2); the membrane wall of the hollow fiber membrane (2) is used as an electrode separation material between the titanium fiber composite cathode (4) and the titanium fiber composite anode (3) for avoiding short circuit;
the water filter is characterized in that a water inlet (5) and a water outlet (6) are respectively formed in the side wall of the cavity (1) and used for introducing and discharging water to be filtered, and the two ends of the hollow fiber membrane (2) penetrate through the top end and the bottom end of the cavity (1) through pipelines respectively, so that the inside of the hollow fiber membrane (2) is directly communicated with the outside and used as a water outlet (7) for producing water, and the filtered water is discharged.
2. The device according to claim 1, characterized in that the water inlet (5) and the water outlet (6) are respectively located at the bottom end and the top end of the side wall of the chamber (1).
3. The device according to claim 1, wherein the titanium fiber composite anode (3) comprises a titanium fiber substrate, a micro-nano structure Ti surface layer, a metal oxide catalyst layer and a super-hydrophobic coating from inside to outside;
the titanium fiber composite cathode (4) comprises a titanium fiber matrix, a micro-nano structure Ti surface layer, a metal oxide catalyst layer, a conductive coating and a super-hydrophobic coating from inside to outside;
or the titanium fiber composite cathode (4) comprises a titanium fiber matrix, a micro-nano structure Ti surface layer, a conductive coating and a super-hydrophobic coating from inside to outside;
or the titanium fiber composite cathode (4) comprises a titanium fiber matrix, a micro-nano structure Ti surface layer, a metal oxide catalyst layer and a super-hydrophobic coating from inside to outside.
4. The device according to claim 3, wherein the titanium fiber matrix is a Ti or Ti alloy wire-like fiber material; the micro-nano structure Ti surface layer is a Ti metal surface layer with micron columns or micron pits growing on the titanium fiber substrate;
the metal oxide catalyst layer is formed by loading any one oxide of Ti, Mn, Ce, Ni, Co, Cu, Zn, Fe, Sn, Sb, Pb, Ir and Ru on a micro-nano structure Ti surface layer;
or the metal oxide catalyst layer is a composite oxide which loads two or more of Ti, Mn, Ce, Ni, Co, Cu, Zn, Fe, Sn, Sb, Pb, Ir and Ru on the micro-nano configuration Ti surface layer.
5. The device of claim 4, wherein the metal oxide catalyst layer has a nanowire, nanorod, or nanocone structure.
6. The device of claim 1, wherein the hollow fiber membrane is made of one of PAN, PVC, PES, PP, PS, PVDF, PTFE, and inorganic ceramic.
7. The device according to claim 1, wherein the diameter of the titanium fiber composite anode (3) is in the range of 0.01mm to 1mm, and the diameter of the titanium fiber composite cathode (4) is in the range of 0.01mm to 1 mm.
8. The device according to claim 3, wherein the super-hydrophobic coating is a polytetrafluoroethylene coating or a fluorosilane coating; the conductive coating is composed of one or more of graphene, oxidized graphene, redox graphene, fullerene, nitrogen-doped and sulfur-doped graphene, nitrogen-doped and sulfur-doped oxidized graphene, nitrogen-doped and sulfur-doped redox graphene, and nitrogen-doped and sulfur-doped fullerene.
9. A water treatment method using the electrochemical membrane filtration device based on the titanium fiber composite electrode as claimed in any one of claims 1 to 8, which comprises:
taking a titanium fiber composite electrode as an anode and a cathode, and respectively winding the titanium fiber composite electrode spirally on the outer wall and the inner wall of the hollow fiber membrane (2);
under certain operation pressure, introducing wastewater into the cavity from the water inlet (5) and flowing out from the water outlet (6) in a cross flow manner, wherein the wastewater penetrates through the membrane body from the outer wall of the hollow fiber membrane (2) and enters the hollow fiber membrane, and produced water is discharged through the water outlet (7) communicated with the inner wall of the hollow fiber membrane (2);
in the filtering process, constant current is applied between the titanium fiber composite anode and the titanium fiber composite anode through a direct current stabilized voltage power supply, pollutants on the surface of the hollow fiber membrane are removed through electrochemical oxidation, and simultaneously generated gas is used for ensuring the surface of the hollow fiber membrane to be clean.
10. The method of claim 9, further comprising:
in the back washing stage:
clear water is introduced from a water outlet (7), enters the cavity (1) through the hollow fiber membrane (2), and is finally discharged from a water inlet (5) and a water outlet (6);
air-water backwashing stage:
the gas-water mixed liquid is introduced from the water inlet (5) and fully contacts with the membrane filaments of the hollow fiber membrane (2), impurities on the surface of the hollow fiber membrane are removed, and the removed dirty water is discharged from the water outlet (6) in a cross flow manner.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114835209A (en) * | 2022-04-26 | 2022-08-02 | 北京交通大学 | Electrochemical membrane contact ozone catalytic device based on titanium fiber electrode and water treatment method |
| CN115650374A (en) * | 2022-11-08 | 2023-01-31 | 盐城工学院 | Electrocatalytic oxidation reactor device for advanced treatment of refractory wastewater |
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| CN114835209A (en) * | 2022-04-26 | 2022-08-02 | 北京交通大学 | Electrochemical membrane contact ozone catalytic device based on titanium fiber electrode and water treatment method |
| CN114835209B (en) * | 2022-04-26 | 2024-04-09 | 北京交通大学 | Electrochemical membrane contact ozone catalytic device based on titanium fiber electrode and water treatment method |
| CN115650374A (en) * | 2022-11-08 | 2023-01-31 | 盐城工学院 | Electrocatalytic oxidation reactor device for advanced treatment of refractory wastewater |
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