CN114524492A - Oil-water separation device - Google Patents

Oil-water separation device Download PDF

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Publication number
CN114524492A
CN114524492A CN202210177038.0A CN202210177038A CN114524492A CN 114524492 A CN114524492 A CN 114524492A CN 202210177038 A CN202210177038 A CN 202210177038A CN 114524492 A CN114524492 A CN 114524492A
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oil
water
working electrode
foam
titanium
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CN114524492B (en
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刘会娟
张弓
兰华春
刘锐平
曲久辉
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Tsinghua University
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Tsinghua University
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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
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/465—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electroflotation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02—Separation of non-miscible liquids
    • B01D17/04—Breaking emulsions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/06—Separation of liquids from each other by electricity
    • 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
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • 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
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • C02F2001/46133—Electrodes characterised by the material
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
    • 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 application relates to an oil-water separation device. Oil water separator utilizes the foam metal electrode that has the nanometer array to hold back micron order oil and drips the granule, produces a large amount of hydrogen microbubbles on the foam metal surface through normal position electrolysis water, and oil drips and is taken away from foam metal electrode surface and come-up through the adhesion with the microbubble, and oil drips and is repelled the come-up by foam metal electrode and keep away from the electrode surface under the effect of electric field force simultaneously, and under the synergism of these two processes, the flux has obtained obvious promotion, and the decay of the pollution and the flux on operation in-process electrode surface has obtained effectual suppression.

Description

Oil-water separation device
Technical Field
The present disclosure relates to but not limited to the technical field of emulsion wastewater fine treatment, and more particularly, to but not limited to a method and an apparatus for deep oil removal of emulsion wastewater.
Background
Oily wastewater is a pollutant generated in many industries such as petroleum and natural gas, petrochemical, pharmaceutical, metallurgical and food industries, shipping and maritime, and can cause great harm to public health and ecological systems. With the stricter and stricter discharge requirements, the traditional process can not meet the more and more complicated water quality requirements. Meanwhile, the emulsion wastewater usually contains an emulsifier and a corresponding chemical additive, so that oils in the wastewater generated at the tail end of the process are converted into a micron-sized oil-in-water structure, the oil-water interface property is complex, a compression electric layer and a net compensation roll cannot effectively destabilize and aggregate the colloidal oils, and especially the emulsion wastewater with oil drop particle size within 10 microns is an unavoidable challenge at present.
The traditional oily wastewater treatment technology is divided into physical, chemical and biological methods, including gravity separation, coalescence separation, coagulation, flotation, adsorption, membrane separation, chemical oxidation, biodegradation and the like. Gravity separation and coalescence separation are two main design types of oil-water separators. The former utilizes the difference of oil-water specific gravity, and the latter utilizes the principles of wetting coalescence and collision coalescence to enlarge oil drops and realize higher separation efficiency, but is not applicable to removing micron-sized oil drops. The coagulation method destroys the stability of the O/W emulsion by aggregation, coalescence and flocculation, which is effective for removing even minute oil droplets, but also causes secondary pollution. The adsorption method is used for separating oil from water in wastewater by utilizing an adsorbent with high lipophilicity and hydrophobicity, so that a large amount of medicament is required in practical application, and the problems of adsorbent recovery and the like exist. Flotation is also an effective method of removing emulsified oil droplets, which are separated by adhering to the surface of rising bubbles. With the increasing occurrence of micron-sized oil drops in industrial oily wastewater, due to the precise screening effect of micro-membrane pores, membrane filtration is considered to be an efficient and green oil-water separation method. However, it is difficult to increase the permeability while maintaining the membrane selectivity due to the trade-off effect (a contradictory relationship between the increase and decrease in permeability and selectivity) and the problem of membrane fouling during filtration. Therefore, in order to achieve the purpose of removing the micro oil droplets and maintaining the flux at the same time, there is an urgent need in the art to develop a new technology for treating the emulsion that is efficient and environmentally friendly.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The application provides an environment-friendly deep oil removal method and device for oil-in-water emulsion wastewater. The application provides a filtration process of emulsion waste water degree of depth deoiling method is gravity drive formula.
The application provides an oil-water separator, include: an electrochemical oil-water separator is arranged in the oil-water separator,
the electrochemical oil-water separator comprises a working electrode and a counter electrode;
the electrochemical oil-water separator is configured such that liquid passes through the counter electrode and then the working electrode;
the working electrode is made of foam metal; the foam metal surface is provided with a nano array, the nano array is a nano array formed by wedge-shaped rod-shaped units, the width of each wedge-shaped rod-shaped unit is 20nm to 50nm, the height of each wedge-shaped rod-shaped unit is 1 mu m to 3 mu m, and the distance between every two adjacent wedge-shaped rod-shaped units is 10nm to 40 nm.
In one embodiment provided herein, the nanoarrays are uniformly distributed on the surface of the metal foam;
in one embodiment provided herein, the counter electrode does not affect the flow of the liquid;
in an embodiment that the application provides, electrochemistry oil water separator includes the stock solution container, the stock solution container is the pipe form, working electrode, counter electrode setting are in the stock solution container, the stock solution container sets up perpendicularly, and pending liquid is gone into by the stock solution container upper end, after the processing, flows out by the lower extreme of stock solution container. Optionally, the liquid outlet container is vertically arranged.
In the operation process, a system generates a large amount of hydrogen microbubbles on the surface of the foam metal through in-situ electrolyzed water, emulsified oil drops are carried away from the surface of the filter medium and float upwards through adhesion of the microbubbles, and the oil drops are repelled by the modified foam titanium under the action of an electric field force to float upwards and away from the surface of the electrode.
In one embodiment provided herein, the working electrode has a water contact angle of less than 5 °, an underwater oil contact angle of greater than 150 °, preferably an underwater oil contact angle of greater than 160 °;
in one embodiment provided herein, the working electrode has an underwater air contact angle greater than 150 °;
in one embodiment provided herein, the working electrode has an underwater air contact angle of not less than 160 °.
In one embodiment provided herein, the metal foam is selected from any one or more of titanium foam, aluminum foam, nickel foam, and platinum foam;
in one embodiment provided herein, the material of the nano-array is selected from any one or more of titanium or a titanium compound, aluminum or an aluminum compound, nickel or a nickel compound, and platinum or a platinum compound;
in one embodiment provided herein, the material of the nano-array is selected from any one or more of titanium or titanium oxide, aluminum or aluminum oxide, nickel or nickel oxide, and platinum or platinum oxide;
in one embodiment provided herein, the working electrode has a filtration precision of 1 μm to 10 μm.
In one embodiment provided herein, the material of the counter electrode is any one or more of a titanium ruthenium mesh, a ruthenium iridium titanium mesh and a platinum mesh.
In one embodiment, the counter electrode is located above the working electrode, and the liquid flows through the counter electrode and the working electrode in sequence.
In one embodiment provided herein, the working electrode (cathode) is configured as a filter medium such that emulsified oil droplets do not pass through the working electrode. And a chamber above the working electrode is marked as a stock solution chamber, and a chamber below the working electrode is marked as a filtrate chamber.
In one embodiment of the present invention, the oil-water separator has a flux of 5000 L.m-2·h-1·bar-1To 30000 L.m-2·h-1·bar-1；
In one embodiment provided herein, the current density of the working electrode and the counter electrode is 3A/m2To 40A/m2(ii) a The voltage is 5V to 30V.
In another aspect, the present application provides a method for manufacturing the oil-water separator, wherein the method for manufacturing the working electrode includes the following steps:
1) putting the foam metal into alkali liquor, and treating for 1-10 h at 160-180 ℃ under a closed condition;
2) putting the foam metal treated in the step 1) into an acid solution for treatment for 1-5 h;
3) calcining the foam metal treated in the step 2).
In one embodiment provided herein, the concentration of hydroxide in the alkaline solution in step 1) is 2M to 4M;
in one embodiment provided herein, the treatment in step 1) is performed under closed conditions for 3h to 6 h;
in one embodiment provided herein, the concentration of hydrogen ions in the acid solution in step 2) is 0.1M to 1M;
in one embodiment provided herein, the temperature of the calcination in step 3) is 450 ℃ to 550 ℃, and the time of the calcination is 2h to 6 h.
In a further aspect, the present application provides a use of the oil-water separation device in an oil-water separation process, wherein oil in the liquid to be treated is in the form of oil-in-water emulsion droplets.
In one embodiment provided herein, the oil-in-water emulsion droplets are present in the liquid to be treated in an amount of from 0.1 vol.% to 10 vol.%;
in one embodiment provided herein, the oil-in-water emulsion droplets have a size of 1 μm to 20 μm.
The electrochemical oil-water separation reactor is divided into a liquid storage pipe, an electrochemical oil-water separation component and a water outlet. The oil removing method for the emulsion wastewater is realized by the following steps: firstly, the modified foam titanium is used as a working cathode, the titanium ruthenium net is used as a counter electrode, and the modified foam titanium and the titanium ruthenium net are respectively arranged at corresponding positions of the electrochemical oil-water separation reactor (the modified foam titanium and the titanium ruthenium net can be correspondingly adjusted by using the technical means which are conventional in the field based on voltage and current). And then, adding the oil-water emulsion into a liquid storage pipe of the electrochemical oil-water separation reactor, applying direct-current voltage between a cathode and an anode, and allowing the feed liquid to pass through the counter electrode from the upper part of the counter electrode without obstruction under the action of gravity to reach the surface of the modified foam titanium serving as a filter medium. Finally, the emulsified oil drops are intercepted at the working electrode, thereby achieving the purpose of deep oil removal. Meanwhile, in the filtering process, the working electrode generates a large amount of micro bubbles in situ through electrolyzed water, the micro bubbles are adhered to emulsified oil drops, and the emulsified oil drops are carried away from the surface of the working electrode and float upwards.
When the electrochemical oil-water separation reactor operates, the working electrode is connected with the negative electrode of the direct-current power supply, the counter electrode is connected with the positive electrode, the oil-water emulsion is continuously led in from the water inlet of the vertical liquid storage pipe, the feeding liquid can be continuously led in the liquid storage pipe by the water pump in the operation process, and the liquid level at a certain height is kept in the liquid storage pipe.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the present application may be realized and attained by the invention in its aspects as described in the specification.
Drawings
The accompanying drawings are included to provide an understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.
Fig. 1 is a schematic structural diagram of embodiment 2 of the present application.
FIG. 2 is an SEM photograph of a modified titanium foam obtained in example 1 of the present application.
FIG. 3 is an optical micrograph of an emulsion wastewater before and after treatment in example 2 of the present application.
FIG. 4 shows the treatment efficiency and permeation flux of the electrochemical oil-water separator of example 2 under different voltages.
FIG. 5 is a graph comparing the effect of untreated titanium foam of comparative example 1 and modified titanium foam having a titanium dioxide nanoarray on the surface of example 1 in treating an oil-water emulsion under 0V.
FIG. 6 is a chart of the underwater contact angle statistics for modified and unmodified titanium foams.
Reference numerals are as follows: 1. the electrochemical oil-water separation device comprises a water inlet, 2 parts of a vertical liquid storage pipe, 3 parts of an electrochemical oil-water separation device, 4 parts of a primary liquid cavity I, 5 parts of a primary liquid cavity II, 6 parts of a filtrate cavity, 7 parts of a working cathode (modified titanium foam), 8 parts of a counter electrode (titanium ruthenium net), 9 parts of a power supply, 10 parts of a power supply connecting wire 11, power supply connecting wires, 12 parts of a filtrate water outlet.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application are described in detail below. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
Example 1
In this embodiment, the working electrode is a modified titanium foam transmissive electrode with a titanium dioxide nano-array on the surface, which is prepared by a hydrothermal method. The preparation method comprises the following steps:
the foam titanium is purchased from Kun mountain flourishing New materials Co., Ltd;
and ultrasonically cleaning the foamed titanium in acetone, ethanol and distilled water for 10 minutes in sequence to completely remove surface impurities, and drying in a vacuum drying oven at 60 ℃. Obliquely placing the cleaned and dried foam titanium into a polytetrafluoroethylene lining filled with a 2M NaOH solution, screwing down the foam titanium, placing the reaction kettle into an oven to react for 3 hours at 160 ℃, and naturally cooling to room temperature after the reaction is finished. The treated modified titanium foam was rinsed with deionized water and then immersed in a 0.1M HCl solution for 1 hour. And finally, drying the obtained foam titanium in a 60 ℃ oven, and calcining for 2 hours at 450 ℃ to obtain the modified foam titanium with the titanium dioxide nano array on the surface. The filtration precision of the modified titanium foam is 5 mu m; the water contact angle of the modified titanium foam is 0 degree, and the underwater oil contact angle is 163 degrees; the underwater air contact angle is 160 deg..
The surface of the foam titanium is provided with a wedge-shaped rod-shaped titanium dioxide nano array which is uniformly distributed on the surface of the foam titanium. The width of the wedge-shaped rod-shaped titanium dioxide is 20nm to 50 nm; the height of the wedge-shaped rod-shaped nano titanium dioxide is about 2 mu m; the distance between two adjacent wedge-shaped rod-shaped units is about 20 nm.
Example 2
As shown in fig. 1, the deep oil removing device for oil-in-water emulsion wastewater comprises a liquid storage pipe 2, an electrochemical oil-water separation component 3 and a filtrate water outlet 12, wherein the electrochemical oil-water separation component 3 comprises a primary liquid cavity one 4 located above a counter electrode, a primary liquid cavity two 5 located below the counter electrode, a filtrate cavity 6, a working cathode 7 and a counter electrode 8. Fig. 2 shows an SEM image of modified titanium foam with titanium dioxide nanoarrays on the surface as a filter medium and a working cathode 7.
As shown in FIG. 1, the counter electrode and the working electrode had an area of 3cm × 3cm, the actual working area was a circle having a diameter of 2cm, the distance between the electrodes was 1cm, the chamber size of the first dope chamber was a circle having a cross-sectional diameter of 2cm and a height of 0.5cm, and the chamber size of the second dope chamber was a circle having a cross-sectional diameter of 2cm and a height of 1 cm.
In this embodiment, the working electrode 7 is the modified titanium foam with the titanium dioxide nano array on the surface prepared in embodiment 1, when the electrochemical oil-water separation reactor operates, the working cathode 7 and the negative electrode of the dc power supply 9 are connected, the counter electrode 8 is connected with the positive electrode of the dc power supply, an oil-water emulsion (containing 1 vol.% of hexadecane and 100ppm of sodium dodecylbenzenesulfonate in water, and the average diameter of oil drops is less than 10 microns) is continuously introduced from the water inlet 1 of the liquid storage tube 2, and a liquid level at a certain height is maintained in the liquid storage tube 2, the oil-water emulsion enters the stock solution cavity two 5 from the stock solution cavity one 4 through the counter electrode 8 under the action of gravity, and reaches the surface of the working electrode 7 serving as a filtering medium, emulsified oil drops in the oil-water emulsion are intercepted at the working electrode 7, and the filtrate after oil removal enters the filtrate cavity 6 and is discharged through the filtrate outlet 12. In the operation process, a large amount of hydrogen microbubbles are generated on the surface of the working electrode 7 through in-situ electrolysis of water, and emulsified oil drops are carried away from the surface of the working electrode 7 through adhesion of the microbubbles and float upwards.
FIG. 3 is an optical micrograph of an oil-water emulsion before and after passing through the electrochemical oil-water separator, and as shown in FIG. 4, the current densities thereof were 4.0. + -. 0.1A/m when the voltages were set at 5V, 10V and 20V, respectively2、15.6±0.3A/m2、33.7±4.5A/m2And 1 vol.% of oil-water emulsion (the water contains 1 vol.% of hexadecane and 100ppm of sodium dodecyl benzene sulfonate, and the average particle size of oil drops is not more than 20 micrometers).
The flux is 7559 + -430 L.m-2·h-1·bar-1，10174±432L·m-2·h-1·bar-1，18094±2100L·m-2·h-1·bar-1The flux is increased by 1.7, 2.3 and 4.1 times compared with the flux when the power is not applied.
Comparative example 1
This comparative example is different from example 2 only in that the untreated titanium foam of example 1 was used instead of the modified titanium foam having a titanium dioxide nano-array on the surface prepared in example 1, and other test conditions were the same.
Fig. 5 is a comparison graph of the effect of untreated titanium foam of comparative example 1 and the effect of modified titanium foam having a titanium dioxide nanoarray on the surface thereof in example 1 when an oil-water emulsion is treated under 0V, the oil-water emulsion is the same as the oil-water emulsion in example 2, and due to the super-hydrophilicity of the titanium dioxide nanoarray on the surface of the modified titanium foam provided in example 1, the emulsified oil droplets do not easily form a dense oil film on the surface of a filter medium, so that the permeation flux is significantly improved, and the removal rate is increased from 80% to 98%.
As shown in FIG. 6, the underwater oil contact angle of the unmodified titanium foam prepared in comparative example 1 was 131 °, the underwater oil contact angles of the modified titanium foams reacted for 1h to 10h were all more than 150 °, and the underwater oleophobicity was 163 ° with respect to the modified titanium foam reacted for 3h, i.e., the underwater oil contact angle of the modified titanium foam used in the examples.
Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.

Claims (10)

1. An oil-water separation device comprising: an electrochemical oil-water separator is arranged in the oil-water separator,
the electrochemical oil-water separator comprises a working electrode and a counter electrode;
the electrochemical oil-water separator is configured such that liquid passes through the counter electrode and then the working electrode;
the working electrode is made of foam metal; the foam metal surface is provided with a nano array, the nano array is a nano array formed by wedge-shaped rod-shaped units, the width of each wedge-shaped rod-shaped unit is 20nm to 50nm, the height of each wedge-shaped rod-shaped unit is 1 mu m to 3 mu m, and the distance between every two adjacent wedge-shaped rod-shaped units is 10nm to 40 nm.
2. The oil and water separation device of claim 1, wherein the working electrode has a water contact angle of less than 5 °, an underwater oil contact angle of greater than 150 °, preferably an underwater oil contact angle of greater than 160 °;
optionally, the underwater air contact angle of the working electrode is greater than 150 °; preferably, the underwater air contact angle of the working electrode is not less than 160 °.
3. The oil-water separator according to claim 1, wherein the metal foam is selected from any one or more of titanium foam, aluminum foam, nickel foam, and platinum foam;
optionally, the material of the nano array is selected from any one or more of titanium or a titanium compound, aluminum or an aluminum compound, nickel or a nickel compound, and platinum or a platinum compound;
preferably, the material of the nano array is selected from any one or more of titanium or titanium oxide, aluminum or aluminum oxide, nickel or nickel oxide and platinum or platinum oxide;
optionally, the working electrode has a filtration precision of 1 μm to 10 μm.
4. The oil-water separation device according to any one of claims 1 to 3, wherein the counter electrode is made of one or more of a titanium ruthenium mesh, a ruthenium iridium titanium mesh, and a platinum mesh.
5. The oil and water separator according to any one of claims 1 to 3, wherein the counter electrode is located above the working electrode, and the liquid flows through the counter electrode and the working electrode one after the other.
6. The oil-water separator according to any one of claims 1 to 3, wherein the flux of the oil-water separator is 5000L-m-2·h-1·bar-1To 30000 L.m-2·h-1·bar-1；
Optionally, the current density of the working electrode and the counter electrode is 3A/m2To 40A/m2(ii) a The voltage is 5V to 30V.
7. The method for manufacturing an oil-water separator according to any one of claims 1 to 6, wherein the method for manufacturing the working electrode comprises the steps of:
1) putting the foam metal into alkali liquor, and treating for 1-10 h at 160-180 ℃ under a closed condition; optionally, treating for 3 to 6 hours under a closed condition;
2) putting the foam metal treated in the step 1) into an acid solution for treatment for 1-5 h;
3) calcining the foam metal treated in the step 2).
8. The method for producing an oil-water separator according to claim 7, wherein the concentration of hydroxide in the alkali solution in step 1) is 2M to 4M;
optionally, the concentration of hydrogen ions in the acid solution in the step 2) is 0.1M to 1M;
alternatively, the temperature of the calcination in step 3) is 450 ℃ to 550 ℃, and the time of the calcination is 2h to 6 h.
9. Use of an oil and water separator according to any of claims 1-6 in an oil and water separation process, wherein the oil in the liquid to be treated is present in the form of oil-in-water emulsion droplets.
10. Use according to claim 9, wherein the oil-in-water emulsion droplets are present in the liquid to be treated in an amount of from 0.1 to 10 vol.%;
optionally, the oil-in-water emulsion droplets are no larger than 20 μm in size.
CN202210177038.0A 2022-02-25 2022-02-25 Oil-water separation device Active CN114524492B (en)

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CN107459106A (en) * 2017-09-22 2017-12-12 中国科学院生态环境研究中心 A kind of electrochemistry membrane-separation water treatment device and its processing method and purposes
CN109928468A (en) * 2017-12-18 2019-06-25 天津大学 A kind of DC electric field acts on the breaking method of lower oil-in-water emulsion
CN108179454A (en) * 2017-12-29 2018-06-19 重庆大学 A kind of preparation method of the super infiltration titanium foam of water-oil separating

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