CN111151144B - Nano porous membrane cleaning device and cleaning method based on insulation dielectrophoresis - Google Patents
Nano porous membrane cleaning device and cleaning method based on insulation dielectrophoresis Download PDFInfo
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- CN111151144B CN111151144B CN202010016170.4A CN202010016170A CN111151144B CN 111151144 B CN111151144 B CN 111151144B CN 202010016170 A CN202010016170 A CN 202010016170A CN 111151144 B CN111151144 B CN 111151144B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/22—Electrical effects
Abstract
Disclosed are a nano porous membrane cleaning device and a method based on insulation dielectrophoresis, wherein in the cleaning device, a body comprises a fixing unit for fixing a nano porous membrane to be cleaned, and the nano porous membrane is detachably connected with the fixing unit; the first inlet pump is arranged on the first side of the body to pump a first liquid into the body; the second inlet pump is arranged on the first side of the body to pump a second liquid into the body; the first electrode is arranged on the upper surface of the body, the second electrode is arranged on the lower surface of the body, the second electrode and the first electrode are oppositely arranged, the power supply is connected with the first electrode and the second electrode, so that the body forms an electric field in the area between the first electrode and the second electrode, and the dielectric property of the polarized particles and the electric field gradient of the electric field are adjusted by adjusting the frequency and/or power of the power supply based on the type of the nano porous membrane, the shape of the pores and/or the size of the pores.
Description
Technical Field
The invention relates to the technical field of reverse osmosis separation processes for desalination and wastewater treatment processes, in particular to a nano porous membrane cleaning device and method based on insulation dielectrophoresis.
Background
With the rapid development of social industry, economy and population, water resources are seriously short in recent years due to the discharge and pollution of various dangerous pollutants in river water, lake water, underground water and the like. In the face of the challenge, the development of efficient seawater desalination is crucial to the sustainable development of fresh water resources. At present, the seawater desalination technology mainly comprises a distillation method, an electrodialysis method, a reverse osmosis method, a hot membrane co-production and the like. The membrane-based seawater desalination technology becomes an important means for solving the global water resource problem by virtue of high efficiency and low energy consumption. In addition, with the progress of nanotechnology, nanomembrane technology is widely used in the fields of seawater desalination, sewage treatment, fuel cells, and the like. However, the nanoporous membrane having very fine pores tends to be contaminated due to pore clogging due to accumulation of organic, inorganic and colloidal components during operation, and in this case, the water permeability of the membrane and corresponding seawater desalination and sewage treatment efficiency are seriously deteriorated. Therefore, the development of effective antifouling method is the key of the membrane-based seawater desalination technology.
Alternating current kinetics, including dielectrophoresis, alternating current osmosis and alternating current calorimetry, are techniques for manipulating the behavior of particles by controlling fluid flow at microscopic and nanoscale levels, under precisely controlled alternating current voltages. Dielectrophoresis refers to the directional migration of polarized particles in aqueous solution under the action of a non-uniform electric field. Electrode-based dielectrophoresis requires integration of different types of electrodes together by micro/nano fabrication techniques to produce a non-uniform electric field. And in order to effectively control the behavior of the nanoparticles, the compensation nanoparticles are subjected to smaller stress due to the tiny size, and the dielectrophoresis based on the electrodes needs a very large electric field gradient. It is therefore difficult and costly to manipulate nanoparticles using electrode-based dielectrophoresis.
The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is well known to those of ordinary skill in the art.
Disclosure of Invention
In view of the above problems, the present invention provides a device and a method for cleaning a nanoporous membrane based on insulation dielectrophoresis, which overcome the above disadvantages of the prior art.
The purpose of the invention is realized by the following technical scheme.
A nano porous membrane cleaning device based on insulation dielectrophoresis comprises,
a body including a fixing unit fixing a nanoporous membrane to be cleaned, the nanoporous membrane being detachably connected to the fixing unit;
a first inlet pump provided at a first side of the body to pump a first liquid into the body;
a second inlet pump provided at a first side of the body to pump a second liquid into the body;
a first electrode disposed on an upper surface of the body,
a second electrode provided on a lower surface of the body, the second electrode and the first electrode being arranged oppositely,
a power supply connecting the first and second electrodes such that the body forms an electric field in a region between the first and second electrodes, the polarized particle dielectric properties and the electric field gradient of the electric field being adjusted by adjusting a frequency and/or power of the power supply based on a type of the nanoporous membrane, a shape of the pores, and/or a size of the pores.
The nanoparticles in the blocked nanoporous membrane are polarized in an electric field having a predetermined electric field gradient and discharged through the pores by dielectrophoretic force, significantly improving the cleaning effect.
In the device for cleaning the nanoporous membrane based on the insulating dielectrophoresis, the fixing unit and the nanoporous membrane connected with the fixing unit divide the body area into an upper half part and a lower half part, the first inlet pump is positioned on the upper half part to pump the first liquid into the upper half part, and the second inlet pump is positioned on the lower half part to pump the second liquid into the lower half part.
In the nano porous membrane cleaning device based on the insulation dielectrophoresis, the body is provided with a monitoring device for detecting the concentration of the liquid, and when the concentration value is stabilized in a preset range, the power supply stops supplying power to finish cleaning.
In the nano porous membrane cleaning device based on the insulation dielectrophoresis, the electric heating belt comprises a self-temperature-limiting type electric heating belt, PTC materials are filled in two parallel lines to serve as core wires, a layer of insulating materials is wrapped outside the core belt to serve as a protective layer, when a power supply is switched on, current is transmitted to the other wire through one wire to form a loop, and the core wires emit heat after being electrified.
In the nano porous membrane cleaning device based on the insulation dielectrophoresis, the second inlet pump and the first inlet pump are arranged on the body in a diagonal manner.
In the nano porous membrane cleaning device based on the insulation dielectrophoresis, the power supply is an alternating current power supply or a direct current power supply.
In the nano porous membrane cleaning device based on the insulation dielectrophoresis, the effective value of the direct current voltage or the alternating current voltage of the power supply is 10-20V, and the fixing unit comprises a clamping piece.
In the nano porous membrane cleaning device based on the insulation dielectrophoresis, the power supply has the alternating current power supply frequency of 1000-1000000 Hz.
In the nanoporous membrane cleaning device based on the dielectrophoresis for insulation, the first liquid and/or the second liquid comprises pure water or water containing a softening agent.
According to another aspect of the present invention, a cleaning method of the apparatus for cleaning nanoporous membrane based on insulation dielectrophoresis comprises the steps of,
the nano porous membrane is detachably connected with the fixed unit;
a first inlet pump pumps a first liquid into the body, and a second inlet pump pumps a second liquid into the body;
and turning on a power supply, and forming an electric field in the area between the first electrode and the second electrode by the body to discharge the nano particles in the nano porous membrane, wherein the dielectric property of the polarized particles and the electric field gradient of the electric field are adjusted by adjusting the frequency and/or power of the power supply based on the type of the nano porous membrane, the shape of the pores and/or the size of the pores.
Compared with the prior art, the invention has the beneficial effects that:
based on the insulating property of the nano porous membrane, the invention strengthens the strength gradient of a direct/alternating current electric field in the pores, polarizes nano-sized pollutants in the pores, quickly and efficiently removes the blocking phenomenon of the pores in the membrane, has low selectivity on impurity pollutants and is suitable for most kinds of impurity particles. The cleaning process is soft and efficient, has no mechanical loss and chemical corrosion, and is favorable for prolonging the service life of the membrane. The membrane cleaning device is simple in structure, can be used for cleaning the membrane after being detached and placed in the cleaning device, can be used for cleaning the electrode by hanging the electrode on the membrane device under the condition of not changing the internal structure of the membrane device, and is easy to assemble, low in cost, free of additional pollution, clean and environment-friendly.
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly apparent, and to make the implementation of the content of the description possible for those skilled in the art, and to make the above and other objects, features and advantages of the present invention more obvious, the following description is given by way of example of the specific embodiments of the present invention.
Drawings
Various other advantages and benefits of the present invention will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. Also, like parts are designated by like reference numerals throughout the drawings.
In the drawings:
fig. 1 is a schematic structural view of a membrane cleaning apparatus based on insulation dielectrophoresis according to an embodiment of the present invention.
The invention is further explained below with reference to the figures and examples.
Detailed Description
A specific embodiment of the present invention will be described in more detail below with reference to fig. 1. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the invention, but is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present invention is defined by the appended claims.
For the purpose of facilitating understanding of the embodiments of the present invention, the following description will be made by taking specific embodiments as examples with reference to the accompanying drawings, and the drawings are not to be construed as limiting the embodiments of the present invention.
For better understanding, as shown in fig. 1, a nanoporous membrane cleaning device based on insulation dielectrophoresis includes,
a body 8 including a fixing unit fixing the nanoporous membrane 3 to be cleaned, the nanoporous membrane 3 being detachably connected to the fixing unit;
a first inlet pump 1 provided at a first side of the body 8 to pump a first liquid into the body 8;
a second inlet pump 2 provided at a first side of the body 8 to pump a second liquid into the body 8;
a first electrode 5 provided on an upper surface of the body 8,
a second electrode 6 provided on a lower surface of the body 8, the second electrode 6 and the first electrode 5 being arranged oppositely,
a power supply 7 connecting the first electrode 5 and the second electrode 6 such that the body 8 forms an electric field in the region between the first electrode 5 and the second electrode 6, the polarized particle dielectric properties and the electric field gradient of the electric field being adjusted by adjusting the power supply frequency and/or power based on the type of nanoporous membrane, the shape of the pores, and/or the size of the pores.
In the invention, the nano particles in the nano porous membrane 3 are discharged from the nano porous membrane 3 under the action of the electric field, so that the cleaning effect is realized, the dielectrophoresis based on the insulator can utilize the nano-sized insulating barrier or the nano porous membrane to generate larger electric field gradient, and the directional migration of the nano particles can be effectively controlled.
In a preferred embodiment of the nanoporous membrane cleaning device based on the insulated dielectrophoresis, the fixed unit and the nanoporous membrane 3 connected thereto divide the area of the body 8 into an upper half and a lower half, the first inlet pump 1 is positioned in the upper half to pump the first liquid into the upper half, and the second inlet pump 2 is positioned in the lower half to pump the second liquid into the lower half.
In the preferred embodiment of the nanoporous membrane cleaning device based on insulating dielectrophoresis, the body 8 is provided with a monitoring device for detecting the concentration of the liquid, and when the concentration value is stabilized in a predetermined range, the power supply 7 stops supplying power to end the cleaning.
In the preferred embodiment of the nano porous membrane cleaning device based on the insulation dielectrophoresis, the electric heating belt comprises a self-temperature-limiting electric heating belt, PTC materials are filled in two parallel lines to serve as core wires, a layer of insulating materials is wrapped outside the core belt to serve as a protective layer, when a power supply 7 is switched on, current is transmitted to the other wire through one wire to form a loop, and the core wires emit heat after being electrified.
In the preferred embodiment of the nanoporous membrane cleaning device based on insulation dielectrophoresis, the second inlet pump 2 and the first inlet pump 1 are arranged diagonally on the body 8.
In a preferred embodiment of the nanoporous membrane cleaning device based on insulation dielectrophoresis, the power supply 7 is an alternating current power supply 7 or a direct current power supply 7.
In a preferred embodiment of the nanoporous membrane cleaning device based on insulation dielectrophoresis, the dc voltage or ac voltage of the power supply 7 has an effective value of 10-20V, and the fixing unit comprises a clamping member.
In a preferred embodiment of the nanoporous membrane cleaning device based on the insulated dielectrophoresis, the power supply 7 has an alternating current power supply 7 frequency of 1000-.
For this example, a classical electrophoretic force FDEPThe formula is as follows:
f: the solution dielectric constant, Rp is the nanoparticle radius,
is a Clausius-Mossotti factor
The real part of (a) is,
is a nabla vector differential operator, | E | non-woven phosphor2Is the square of the mode of the field strength E, wherein,
the expression is as follows:
wherein the content of the first and second substances,
is the complex dielectric constant of the particles,
the complex dielectric constant of the solution.
Under the action of an alternating current electric field, the dielectric constant calculation formula of the solution and the particles is as follows:
Therefore, the frequency is adjusted to adapt to different particle materials, and the range of the particle materials which can be cleaned is expanded.
In a preferred embodiment of the nanoporous membrane cleaning device based on insulating dielectrophoresis, the first liquid and/or the second liquid comprises pure water or water containing a softening agent.
To further understand the present invention, in one embodiment, a nanoporous membrane 3 cleaning apparatus based on insulation dielectrophoresis includes: the membrane comprises a polluted porous nano membrane, a first electrode 5 and a second electrode 6 which are arranged on two sides of the membrane, an alternating current/direct current power supply 7 which is connected with the first electrode 5 and the second electrode 6, and a driving pump which is arranged on two sides of the membrane and is used for driving fluid between the membrane and electrodes on two sides to flow and take away precipitated impurities.
In one embodiment, the dc or ac voltage of the power supply 7 has an effective value of 10-20V, and the type of the power supply 7 is determined by the main species of impurities in the film and their dielectric constant. When the impurities are of a single type and the physical properties of the impurities and the solution are not sensitive to temperature changes, the cleaning can be performed by using the direct-current power supply 7. In order to avoid local high temperature damage to the membrane pore structure while softening impurities in the nano porous membrane 3 by using the alternating current thermal effect, the frequency of the 1000-1000000Hz alternating current power supply 7 can be adopted in the case that the impurity types are complex and the physical properties of the impurities and the solution are sensitive to the temperature change.
In one embodiment, the nanoporous film 3 is an insulating film, the pore size and pore shape of which directly affect the cleaning effect. The smaller the aperture, the larger the aperture changes along with the depth direction, the larger the stress of the blocked impurities in the aperture is, and the better the cleaning effect is.
In one embodiment, the first and second electrodes 6 and the power source 7 connected thereto can be disposed outside the working device of the contaminated membrane to clean the contaminated membrane, or the contaminated membrane can be detached and fixed in the nanoporous cleaning device to be cleaned.
In one embodiment, a nanoporous membrane cleaning device based on insulation dielectrophoresis comprises: the device comprises a polluted nano porous membrane 3, a first electrode 5 and a second electrode 6 which are arranged on two sides of the membrane, an alternating current/direct current power supply 7 which is connected with the first electrode and the second electrode, a first inlet pump 1 and a second inlet pump 2 which are arranged on two sides of the membrane and used for driving fluid between the membrane and the electrodes on the two sides to flow and take away precipitated impurities.
In one embodiment, the power supply 7 has a DC or AC voltage with an effective value of 10-20V, and the type of power supply is determined by the main species of impurities in the film and their dielectric constant. In the case of single impurity type and insensitivity of impurities and solution physical property to temperature variation, the cleaning device can be cleaned by using a direct current power supply. In order to avoid local high temperature damage to the membrane pore structure while softening impurities in the nano porous membrane by using alternating current thermal effect, 1000-1000000Hz alternating current power frequency can be adopted in the case of complex impurity types and sensitive impurities and solution physical properties along with temperature change, the nano porous membrane 3 is an insulating membrane, and the pore diameter and the pore shape of the nano pore 4 directly influence the cleaning effect. The smaller the aperture, the larger the aperture changes along with the depth direction, the larger the stress of the blocked impurities in the aperture is, and the better the cleaning effect is. The first electrode 5, the second electrode 6 and the power supply 7 connected with the first electrode can be arranged outside the working device of the polluted membrane to clean the polluted membrane 3, and the polluted membrane 3 can also be detached and fixed in a nano-porous cleaning device to be cleaned.
A cleaning method of the nano porous membrane cleaning device based on the insulation dielectrophoresis comprises the following steps,
the nano porous membrane 3 is detachably connected with the fixed unit;
the first inlet pump 1 pumps a first liquid into the body 8, and the second inlet pump 2 pumps a second liquid into the body 8;
the power supply 7 is turned on and the body 8 forms an electric field in the region between the first electrode 5 and the second electrode 6 to discharge the nanoparticles in the nanoporous membrane 3, wherein the electric field gradient of the electric field is adjusted by adjusting the power supply frequency and/or power based on the type of the nanoporous membrane, the shape of the pores, and/or the size of the pores.
In a preferred embodiment, the cleaning method comprises,
the sewage in the device where the polluted membrane is positioned is drained, or the polluted membrane is disassembled in the working device and fixed in the nano porous cleaning device, the first inlet pump 1 and the second inlet pump 2 are opened, and proper pure water or clean water added with a softening agent is introduced into the device, so that the polluted membrane is fully soaked and softened in the solution.
And (3) turning on a switch of a power supply 7, adding a direct current or alternating current electric field in the depth direction of the cleaned membrane, forming a larger electric field gradient in the holes of the cleaned membrane by the electric field, polarizing the nanoparticles blocked in the holes, and discharging the polarized nanoparticles under the driving of the electric field force.
The first inlet pump 1 and the second inlet pump 2 are opened, and pure water or cleaning water added with softener is continuously fed into the device to take away the discharged nano-particles.
Monitoring the impurity concentration of the device discharge liquid, properly adjusting the voltage or alternating current frequency of the power supply 7, turning off the power supply 7 when the impurity concentration of the device discharge liquid is not changed any more, emptying the solution in the device, and finishing cleaning.
The device has simple structure and cleaning flow, mild cleaning means, no mechanical damage and chemical pollution to the membrane, obvious social benefit and circular economic benefit, and can be widely applied to the fields of sewage treatment, seawater desalination and the like.
Industrial applicability
The nano porous membrane cleaning device and the method based on the insulation dielectrophoresis can be manufactured and used in the fields of desalination and reverse osmosis separation processes of wastewater treatment processes.
The foregoing describes the general principles of the present application in conjunction with specific embodiments, however, it is noted that the advantages, effects, etc. mentioned in the present application are merely examples and are not limiting, and they should not be considered essential to the various embodiments of the present application. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the foregoing disclosure is not intended to be exhaustive or to limit the disclosure to the precise details disclosed.
The foregoing description has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit embodiments of the application to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.
Claims (9)
1. A nano porous membrane cleaning device based on insulation dielectrophoresis comprises,
a body including a fixing unit fixing a nanoporous membrane to be cleaned, the nanoporous membrane being detachably connected to the fixing unit;
a first inlet pump provided at a first side of the body to pump a first liquid into the body;
a second inlet pump provided at a first side of the body to pump a second liquid into the body;
a first electrode disposed on an upper surface of the body,
a second electrode provided on a lower surface of the body, the second electrode and the first electrode being arranged oppositely,
a power supply connecting the first and second electrodes such that the body forms an electric field in a region between the first and second electrodes, the polarized particle dielectric properties and the electric field gradient of the electric field being adjusted by adjusting a frequency and/or power of the power supply based on a type of the nanoporous membrane, a shape of the pores, and/or a size of the pores.
2. The insulating dielectrophoresis-based nanoporous membrane cleaning device as claimed in claim 1, wherein the fixed unit and the nanoporous membrane connected thereto divide the body region into an upper half and a lower half, the first inlet pump being located at the upper half to pump the first liquid into the upper half, and the second inlet pump being located at the lower half to pump the second liquid into the lower half.
3. The insulating dielectrophoresis-based nanoporous membrane cleaning device as claimed in claim 1, wherein the body is provided with a monitoring means for detecting a concentration of the liquid, and when the concentration value is stabilized within a predetermined range, the power supply is stopped to terminate the cleaning.
4. The nanoporous membrane cleaning device based on insulated dielectrophoresis as claimed in claim 1, wherein the second inlet pump is arranged diagonally to the first inlet pump on the body.
5. The nanoporous membrane cleaning device based on insulation dielectrophoresis as claimed in claim 1, wherein the power source is an alternating current power source or a direct current power source.
6. The nanoporous membrane cleaning device based on insulation dielectrophoresis as claimed in claim 1, wherein the power direct voltage or alternating voltage has an effective value of 10-20V, and the fixing unit comprises a holder.
7. The nanoporous membrane cleaning device based on insulation dielectrophoresis as claimed in claim 1, wherein the power source has an ac power frequency of 1000-.
8. The nanoporous membrane cleaning device based on insulation dielectrophoresis as claimed in claim 1, wherein the first liquid and/or the second liquid comprises pure water or water containing a softening agent.
9. A cleaning method of the nanoporous membrane cleaning device based on insulation dielectrophoresis of any one of claims 1 to 8, which comprises the steps of,
the nano porous membrane is detachably connected with the fixed unit;
a first inlet pump pumps a first liquid into the body, and a second inlet pump pumps a second liquid into the body;
and turning on a power supply, and forming an electric field in the area between the first electrode and the second electrode by the body to discharge the nano particles in the nano porous membrane, wherein the dielectric property of the polarized particles and the electric field gradient of the electric field are adjusted by adjusting the frequency and/or power of the power supply based on the type of the nano porous membrane, the shape of the pores and/or the size of the pores.
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