CN117558379B - Method, device, system and electronic equipment for characterizing membrane pollution of forward osmosis membrane - Google Patents

Method, device, system and electronic equipment for characterizing membrane pollution of forward osmosis membrane Download PDF

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CN117558379B
CN117558379B CN202410020808.XA CN202410020808A CN117558379B CN 117558379 B CN117558379 B CN 117558379B CN 202410020808 A CN202410020808 A CN 202410020808A CN 117558379 B CN117558379 B CN 117558379B
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CN117558379A (en
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姚蕾
徐萧剑
陈喆
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Wuhan Institute of Technology
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Abstract

The invention relates to a membrane pollution characterization method, a device, electronic equipment and a medium of a forward osmosis membrane, wherein the method comprises the following steps: acquiring impedance data of the forward osmosis membrane acquired by an impedance analyzer; constructing an equivalent circuit model of the forward osmosis membrane based on the impedance data, and acquiring inductance data of the forward osmosis membrane according to the equivalent circuit model; and establishing a probability density function of the inductance data, and determining the pollution degree of the forward osmosis membrane according to the probability density function of the inductance data. According to the invention, the inductance is used as a membrane pollution detection index of the forward osmosis membrane, a probability density function of inductance data is established, the pollution degree of the forward osmosis membrane is determined according to the probability density function of the inductance data, a novel characterization method is provided for detecting the membrane pollution of the forward osmosis membrane during ion transport, and the problem that the membrane pollution of the forward osmosis membrane during ion transport is difficult to detect by the traditional membrane pollution test method is solved.

Description

Method, device, system and electronic equipment for characterizing membrane pollution of forward osmosis membrane
Technical Field
The invention relates to the technical field of membrane pollution detection, in particular to a membrane pollution characterization method and device of a forward osmosis membrane, electronic equipment and a medium.
Background
As an emerging osmotically driven membrane process, the forward osmosis membrane is rapidly developed and applied to industrial and environmental wastewater purification, and has the advantages of high water recovery rate, high energy efficiency, high sustainability and the like, but membrane pollution is still a key problem which plagues the long-term stability of the forward osmosis membrane. At present, the characterization method of the membrane pollution process is mainly through an electron microscope, an atomic force microscope and element analysis, and the real-time detection and analysis of the membrane pollution are still limited.
In the prior art, electrochemical impedance spectroscopy is used as a non-invasive detection technology, and related information such as capacitance resistance, impedance and the like of a membrane interface can be obtained under different frequency conditions by applying a small-range sine alternating potential on the surface of a membrane, so that membrane pollution conditions are sensitively reflected, and the electrochemical impedance spectroscopy has been used for researching membrane pollution in different membrane filtration processes, including microfiltration, ultrafiltration, reverse osmosis and the like, and is also applied to forward osmosis. In the use scene of detecting macromolecular pollutants, the existence of the membrane pollution is easily reflected through the capacitance and the impedance, but in the ion transport scene, the pollution layer is loose and has weak signals due to the characteristics of ions, and the membrane pollution is difficult to detect through the capacitance and the impedance.
Disclosure of Invention
In view of the foregoing, there is a need for a method, apparatus, electronic device, and medium for characterizing membrane fouling of a forward osmosis membrane to solve the problem that it is difficult to detect membrane fouling of a forward osmosis membrane during ion transport by conventional membrane fouling testing methods.
In order to solve the above problems, in a first aspect, the present invention provides a membrane fouling characterization method of a forward osmosis membrane, comprising:
acquiring impedance data of the forward osmosis membrane acquired by an impedance analyzer; the impedance data are obtained by carrying out electrochemical impedance analysis on a forward osmosis membrane in a preset electrolytic cell through an impedance analyzer;
constructing an equivalent circuit model of the forward osmosis membrane based on the impedance data, and acquiring inductance data of the forward osmosis membrane according to the equivalent circuit model;
and establishing a probability density function of the inductance data, and determining the pollution degree of the forward osmosis membrane according to the probability density function of the inductance data.
Preferably, the equivalent circuit model comprises an equivalent resistance Rs of electrolyte in the preset electrolytic cell, an equivalent capacitance C1 of a forward osmosis membrane, an equivalent resistance Rm of the forward osmosis membrane, an inductance L1 of the forward osmosis membrane and an equivalent resistance R1 of the inductance;
the equivalent resistor Rs is connected in series with the equivalent capacitor C1, the equivalent capacitor C1 is connected in parallel with the equivalent resistor Rm, and the inductor L1 is connected in parallel with the equivalent resistor R1 at two ends of the equivalent resistor Rm after being connected in series.
Preferably, the obtaining inductance data of the forward osmosis membrane according to the equivalent circuit model includes:
establishing a state equation of an equivalent circuit model based on kirchhoff voltage law;
and obtaining inductance data of the forward osmosis membrane according to a state equation of the equivalent circuit model.
Preferably, the state equation of the equivalent circuit includes:
wherein x is 1 Representing the voltage across the equivalent capacitance C1, x 2 Representing the current flowing through the inductance L1,representing the equivalent circuit system voltage, +.>Is thatx 1 First derivative of>Is thatx 2 Is a first derivative of (a).
Preferably, the probability density function of the inductance data is expressed as:
in the method, in the process of the invention,Linductance data representing a forward osmosis membrane,f（L) Representing a probability density function of the inductance data.
Preferably, determining the pollution degree of the forward osmosis membrane according to the probability density function of the inductance data specifically comprises:
obtaining an error coefficient of inductance data:
and according to the probability density function of the inductance data, combining the error coefficient of the inductance data to obtain a pollution degree expression of the forward osmosis membrane:wherein C represents the degree of contamination of the forward osmosis membrane,Brepresenting the error coefficient of the inductance data.
In a second aspect, the present invention also provides a membrane fouling characterization device for a forward osmosis membrane, comprising:
the impedance acquisition module is used for acquiring impedance data of the forward osmosis membrane acquired by the impedance analyzer; the impedance data are obtained by carrying out electrochemical impedance analysis on a forward osmosis membrane in a preset electrolytic cell through an impedance analyzer;
the inductance acquisition module is used for constructing an equivalent circuit model of the forward osmosis membrane based on the impedance data and acquiring inductance data of the forward osmosis membrane according to the equivalent circuit model;
and the pollution degree determining module is used for establishing a probability density function of the inductance data and determining the pollution degree of the forward osmosis membrane according to the probability density function of the inductance data.
Preferably, the inductance obtaining module includes:
an equivalent circuit construction unit for constructing an equivalent circuit model of the forward osmosis membrane based on the impedance data;
the state equation building unit is used for building a state equation of an equivalent circuit model based on kirchhoff voltage law;
and the inductance data calculation unit is used for obtaining the inductance data of the forward osmosis membrane according to the state equation of the equivalent circuit model.
In a third aspect, the invention also provides an electronic device comprising a memory and a processor, wherein,
the memory is used for storing programs;
the processor is coupled to the memory and is configured to execute the program stored in the memory to implement the steps in a method for characterizing membrane fouling of a forward osmosis membrane described in any one of the above implementations.
In a third aspect, the present invention also provides a computer readable storage medium storing a computer readable program or instructions which when executed by a processor is capable of carrying out the steps of a method for characterizing membrane fouling of a forward osmosis membrane as described in any one of the above implementations.
The beneficial effects of adopting the embodiment are as follows: according to the membrane pollution characterization method of the forward osmosis membrane, impedance data of the forward osmosis membrane acquired by an impedance analyzer are acquired; constructing an equivalent circuit model of the forward osmosis membrane based on the impedance data, and acquiring inductance data of the forward osmosis membrane according to the equivalent circuit model; and establishing a probability density function of the inductance data, and determining the pollution degree of the forward osmosis membrane according to the probability density function of the inductance data. According to the invention, the inductance is used as a membrane pollution detection index of the forward osmosis membrane, a probability density function of inductance data is established, the pollution degree of the forward osmosis membrane is determined according to the probability density function of the inductance data, a novel characterization method is provided for detecting the membrane pollution of the forward osmosis membrane during ion transport, and the problem that the membrane pollution of the forward osmosis membrane during ion transport is difficult to detect by the traditional membrane pollution test method is solved.
Drawings
FIG. 1 is a flow chart of one embodiment of a method for characterizing membrane fouling of a forward osmosis membrane provided by the present invention;
FIG. 2 is a schematic diagram of an experimental apparatus for a forward osmosis membrane provided by the present invention;
FIG. 3 is a schematic diagram of an equivalent circuit model provided by the present invention;
FIG. 4 (a) is a graph showing the results of impedance analysis of a polyamide forward osmosis membrane provided by the present invention;
FIG. 4 (b) is a graph showing the results of impedance analysis of the multi-walled carbon nanotube-modified polyamide forward osmosis membrane provided by the present invention;
FIG. 5 is a block diagram of one embodiment of a membrane fouling characterization device for a forward osmosis membrane provided by the present invention;
fig. 6 is a block diagram of an embodiment of an electronic device according to the present invention.
Detailed Description
Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and together with the description serve to explain the principles of the invention, and are not intended to limit the scope of the invention.
FIG. 1 is a flow chart of an embodiment of a method for characterizing membrane fouling of a forward osmosis membrane provided by the present invention. As shown in fig. 1, the membrane fouling characterization method of the forward osmosis membrane includes:
step 110, acquiring impedance data of a forward osmosis membrane acquired by an impedance analyzer; the impedance data are obtained by carrying out electrochemical impedance analysis on a forward osmosis membrane in a preset electrolytic cell through an impedance analyzer.
In particular, the present invention is directed to detecting the degree of contamination of a forward osmosis membrane applied in wastewater purification. In the actual operation, first, the forward osmosis membrane is disposed in a preset electrolytic cell, and the membrane material of the forward osmosis membrane may be a polyamide forward osmosis membrane or a multi-walled carbon nanotube modified polyamide forward osmosis membrane, which is not particularly limited in the present invention.
Fig. 2 is a diagram of an experimental apparatus for a forward osmosis membrane provided by the present invention. As shown in FIG. 2, in this embodiment, the chemical fertilizer wastewater is used as the feed liquid of the electrolyte in the electrolytic cell, the concentration of the chemical fertilizer wastewater can be set to be 0.001-0.05mol/L, the chemical fertilizer wastewater is subjected to electrolytic treatment, and the drawing liquid of the electrolyte is saturated calcium chloride solution.
The method comprises the steps of placing a forward osmosis membrane in an electrolytic cell to divide the electrolytic cell into two electrolytic chambers, respectively inserting two platinum sheet electrodes into the two electrolytic chambers as a working electrode and a counter electrode, respectively using two saturated Ag/AgCl electrodes connected with a Rujin capillary tube as a reference electrode and a sensitive electrode, and symmetrically arranging the two electrodes on two sides of the forward osmosis membrane, wherein four electrodes and the electrolytic cell form a four-electrode measuring device.
Further, the electrolytic cell is connected with an impedance analyzer, and electrochemical impedance analysis is carried out on the forward osmosis membrane in the preset electrolytic cell through the impedance analyzer, so that impedance data of the forward osmosis membrane are obtained. The impedance data for the forward osmosis membrane includes the impedance of the forward osmosis membrane, the capacitance of the forward osmosis membrane, the inductance of the forward osmosis membrane, and the impedance of the inductance. Electrochemical impedance analysis of the forward osmosis membrane also resulted in the impedance of the electrolyte.
And 120, constructing an equivalent circuit model of the forward osmosis membrane based on the impedance data, and acquiring inductance data of the forward osmosis membrane according to the equivalent circuit model.
Specifically, after impedance data of the forward osmosis membrane is obtained, as shown in fig. 2, the impedance analyzer is connected to a computer, the computer obtains the impedance data, an equivalent circuit model of the forward osmosis membrane is constructed based on the impedance data, the impedance of the forward osmosis membrane is equivalent to an equivalent resistance Rm of the forward osmosis membrane, the capacitance of the forward osmosis membrane is equivalent to an equivalent capacitance C1 of the forward osmosis membrane, and the impedance of the electrolyte is equivalent to an equivalent resistance Rs of the electrolyte. Fig. 3 is a schematic diagram of an equivalent circuit model provided by the present invention. As shown in fig. 3, the equivalent resistor Rs is connected in series with the equivalent capacitor C1, the equivalent capacitor C1 is connected in parallel with the equivalent resistor Rm, and the inductor L1 is connected in series with the equivalent resistor R1 and then connected in parallel with both ends of the equivalent resistor Rm.
After an equivalent circuit model is established, impedance data are fitted, and inductance data of the forward osmosis membrane are obtained.
And 130, establishing a probability density function of the inductance data, and determining the pollution degree of the forward osmosis membrane according to the probability density function of the inductance data.
In this embodiment, in order to quantify the relationship between the inductance and the pollution level of the forward osmosis membrane, a probability density function of inductance data is established, and the pollution level of the forward osmosis membrane is characterized by using the inductance data of the forward osmosis membrane.
The membrane pollution characterization method of the forward osmosis membrane provided by the invention takes the inductance as the membrane pollution detection index of the forward osmosis membrane, establishes the probability density function of inductance data, determines the pollution degree of the forward osmosis membrane according to the probability density function of the inductance data, provides a novel characterization method for detecting the membrane pollution of the forward osmosis membrane during ion transportation, and solves the problem that the membrane pollution of the forward osmosis membrane is difficult to detect during ion transportation in the traditional membrane pollution test method.
In a preferred embodiment, in step 120, the obtaining inductance data of the forward osmosis membrane according to the equivalent circuit model includes:
establishing a state equation of an equivalent circuit model based on kirchhoff voltage law;
and obtaining inductance data of the forward osmosis membrane according to a state equation of the equivalent circuit model.
Specifically, first, an expression of the system input and state relation of the equivalent circuit model is constructed:
in the method, in the process of the invention,is a state variable +.>For motivation(s)>Is->First derivative of>In order to output the equation,A、B、C、Dis a parameter;
next, according to general circuit theory, two independent energy storage element inductances and capacitances, the voltage across the inductance and the current through the capacitance are respectively expressed by the following formulas, the state variables of which are determined and the inverse of the state variables are determined:
in the method, in the process of the invention,for the current flowing through the inductance>For the voltage across the capacitor, < >>As a voltage of the equivalent circuit system,A、B、C、D、E、Fis a parameter.
Then, according to the input-output relation of kirchhoff current law, determining a first state equation of an equivalent circuit model to enable、/>Then:
in the method, in the process of the invention,for flowing through->Current of->For flowing through->Is set to be a current of (a);
the first state equation is obtained according to the reduced term:。
further, according to the input-output relationship of kirchhoff's voltage law, a second state equation of the equivalent circuit model is determined, whereinThe system voltage is:
the second state equation is:
converting the first state equation and the second state equation into a matrix form to obtain a system matrix of the equivalent circuit model, wherein the system matrix is as follows:
。
in the method, in the process of the invention,x 1 representing equivalent capacitanceC 1 The voltage across the two terminals of the capacitor,x 2 representing the flow through inductanceL 1 Is used for the current flow of (a),representing the equivalent circuit system voltage, +.>Is thatx 1 First derivative of>Is thatx 2 Is a first derivative of (a).
And solving the two state equations to obtain the inductance data of the forward osmosis membrane.
In a preferred embodiment, in step 130, establishing a probability density function of the inductance data specifically includes:
in normal distribution, for a position parameter isThe probability distribution of the scale parameter A is as follows:
in this embodiment, in order to quantify the relationship between the inductance data and the pollution level of the forward osmosis membrane, a probability density function of the inductance data is established, and the probability density function of the inductance data has the following expression:
where L represents inductance data of the forward osmosis membrane, and f (L) represents a probability density function of the inductance data.
In a preferred embodiment, in step 130, determining the contamination level of the forward osmosis membrane according to the probability density function of the inductance data specifically includes:
first, an error coefficient of inductance data is obtained:
wherein B represents an error coefficient of the inductance data;
then, according to the probability density function of the inductance data and combining the error coefficient of the inductance data, the pollution degree expression of the forward osmosis membrane is obtained:wherein C represents the degree of contamination of the forward osmosis membrane. When 0 < C < 1, mild contamination, when 1 < C < 2, moderate contamination, and when C > 2, severe contamination.
The following are examples of several specific application scenarios of the membrane pollution characterization method of the forward osmosis membrane provided by the present invention:
example 1
And (3) taking a polyamide forward osmosis membrane for electrochemical test, and soaking the polyamide forward osmosis membrane in deionized water before the test to fully infiltrate the polyamide forward osmosis membrane. A four-electrode electrochemical detection device is assembled, the device is shown in figure 2, a polyamide forward osmosis membrane is arranged in the middle of an electrolytic cell to separate the electrolytic cell into two electrolytic chambers, platinum sheet electrodes are respectively inserted into the electrolytic chambers at two sides to serve as a working electrode and a counter electrode, two saturated Ag/AgCl electrodes connected with a Runjin capillary are respectively used as reference electrodes and sensitive electrodes and are symmetrically arranged at two sides of the membrane, chemical fertilizer wastewater (mainly containing 0.003mol/L copper sulfate) is injected at the feed liquid side, a saturated calcium chloride solution is injected at the draw liquid side, and a testing instrument model is IM3590 chemical impedance analyzer (Hoyko, japan) at 10 2 Hz~10 5 Impedance testing was performed with a 0.1mA operating current in the Hz frequency range, and impedance data of the polyamide forward osmosis membrane was obtained by an impedance analyzer. As shown in fig. 4 (a), the impedance arcs in the nyquist plot become smaller and move to low impedance with increasing time, and the interval between the impedance arcs is larger. Then, constructing an equivalent circuit model of the forward osmosis membrane based on the impedance data, acquiring inductance data of the forward osmosis membrane, analyzing the obtained inductance data, finding that the inductance data is continuously reduced along with the change of time, and substituting the inductance data into a probability density function of the inductance data in sequenceIn (2), the pollution degree expression c=according to the forward osmosis membranef(L)+BThe C value was in the range of 1 and 2, and it was found that the degree of contamination of the forward osmosis membrane was moderate.
Example 2
And (3) taking a polyamide forward osmosis membrane for electrochemical test, and soaking the polyamide forward osmosis membrane in deionized water before the test to fully infiltrate the polyamide forward osmosis membrane. A four-electrode electrochemical detection device is assembled, the device is shown in figure 2, a polyamide forward osmosis membrane is arranged in the middle of an electrolytic cell, platinum sheet electrodes are respectively inserted into electrolytic chambers at two sides to serve as a working electrode and a counter electrode, and two saturated Ag/AgCl electrodes connected with a Rujin capillary tube are used as a reference electrode and a counter electrodeThe sensitive electrode is symmetrically arranged at two sides of the membrane, chemical fertilizer wastewater (mainly containing 0.01mol/L copper sulfate) is injected at the feed liquid side, saturated calcium chloride solution is injected at the drawing liquid side, and the model of a testing instrument is IM3590 chemical impedance analyzer (Hoyko, japan) at 10 2 Hz~10 5 Impedance testing was performed with a 0.1mA operating current in the Hz frequency range, and the test results were similar to example 1, with increasing time, the impedance arcs in the nyquist plot becoming smaller and moving toward lower impedance, and the impedance arcs being spaced apart from each other.
Then, constructing an equivalent circuit model of the forward osmosis membrane based on the impedance data, acquiring inductance data of the forward osmosis membrane, analyzing the obtained inductance data, finding that the inductance data is continuously reduced along with the change of time, and substituting the inductance data into a probability density function of the inductance data in sequenceIn (2), the pollution degree expression c=according to the forward osmosis membranef(L)+BThe C value is greater than 2, and the pollution degree of the forward osmosis membrane is seriously polluted. As the concentration of the feed liquefied fertilizer wastewater increases, the pollution level becomes more serious.
Example 3
And (3) taking a multi-wall carbon nano tube modified polyamide forward osmosis membrane for electrochemical test, and soaking the multi-wall carbon nano tube modified polyamide forward osmosis membrane in deionized water before the test to fully infiltrate the membrane. The four-electrode electrochemical detection device is assembled, the device is shown in figure 2, a multi-walled carbon nanotube modified forward osmosis membrane is arranged in the middle of an electrolytic cell, two platinum sheet electrodes are respectively inserted into electrolytic chambers at two sides to serve as a working electrode and a counter electrode, two saturated Ag/AgCl electrodes connected with a Rujin capillary tube are respectively used as a reference electrode and a sensitive electrode and are symmetrically arranged at two sides of the membrane, chemical fertilizer wastewater (mainly containing 0.003mol/L copper sulfate) is injected at the feed liquid side, saturated calcium chloride solution is injected at the drawing liquid side, and the chemical fertilizer wastewater is mixed at the drawing liquid side 2 Hz~10 5 Impedance testing was performed with 0.1mA operating current in the Hz frequency range, test instrument model IM3590 chemical impedance Analyzer (Hoyko, japan), at 10 2 Hz~10 5 Frequency of HzImpedance testing was performed with a 0.1mA operating current in the range, and the test results were shown in fig. 4 (b), with the increase of time, the magnitude of the impedance arc in the nyquist plot was not substantially changed, the range was small although the impedance was also shifted at low impedance, and the impedance arc was tighter from one to the other.
Further, an equivalent circuit model of the forward osmosis membrane is constructed based on the impedance data, inductance data of the forward osmosis membrane is obtained, and the inductance data obtained through analysis find that the inductance data is stable in time variation and has inductance values larger than those of the embodiment 1, and the inductance data is sequentially substituted into a probability density function of the inductance dataIn (2), the pollution degree expression c=according to the forward osmosis membranef(L)+BThe C value was in the range of 0 and 1, and it was found that the degree of contamination of the forward osmosis membrane was slight contamination.
Finally, the pollution degree characterization results in the example 1 and the example 3 are verified by running a chemical fertilizer wastewater forward osmosis experiment, and under the same experimental condition, the permeation flux of the polyamide forward osmosis membrane adopted in the example 1 is reduced from 42.6LMH to 5.4LMH, the permeation flux is reduced by 87.3%, the permeation flux of the multi-wall carbon nano tube modified polyamide forward osmosis membrane adopted in the example 3 is reduced from 26.4LMH to 14.2LMH, and the permeation flux is reduced by 46.2%. The polyamide forward osmosis membrane has obvious decrease and serious membrane pollution compared with the polyamide forward osmosis membrane modified by the multi-wall carbon nano tube. The pollution degree result obtained in the foregoing example 1 is heavy pollution, the pollution degree obtained in the foregoing example 3 is light pollution, and the pollution degree detection result in the foregoing example is consistent with the positive penetration test verification result of the fertilizer wastewater, which illustrates the feasibility and reliability of the inductance as a new detection index for detecting membrane pollution in the ion transportation process.
FIG. 5 is a block diagram illustrating an exemplary embodiment of a forward osmosis membrane fouling characterization device according to the present invention, and as illustrated in FIG. 5, a forward osmosis membrane fouling characterization device 500 includes:
an impedance acquisition module 501, configured to acquire impedance data of the forward osmosis membrane acquired by an impedance analyzer; the impedance data are obtained by carrying out electrochemical impedance analysis on a forward osmosis membrane in a preset electrolytic cell through an impedance analyzer;
the inductance acquisition module 502 is configured to construct an equivalent circuit model of the forward osmosis membrane based on the impedance data, and acquire inductance data of the forward osmosis membrane according to the equivalent circuit model;
a pollution level determining module 503, configured to establish a probability density function of the inductance data, and determine the pollution level of the forward osmosis membrane according to the probability density function of the inductance data.
The membrane pollution characterization device for the forward osmosis membrane provided by the invention takes the inductance as the membrane pollution detection index of the forward osmosis membrane, establishes the probability density function of inductance data, determines the pollution degree of the forward osmosis membrane according to the probability density function of the inductance data, provides a novel characterization method for detecting the membrane pollution of the forward osmosis membrane during ion transportation, and solves the problem that the membrane pollution of the forward osmosis membrane is difficult to detect during ion transportation in the traditional membrane pollution test method.
In a preferred embodiment, the inductance acquisition module 502 includes:
an equivalent circuit construction unit for constructing an equivalent circuit model of the forward osmosis membrane based on the impedance data;
the state equation building unit is used for building a state equation of an equivalent circuit model based on kirchhoff voltage law;
and the inductance data calculation unit is used for obtaining the inductance data of the forward osmosis membrane according to the state equation of the equivalent circuit model.
Fig. 6 is a block diagram of an embodiment of an electronic device according to the present invention, and as shown in fig. 6, the present invention further provides an electronic device 600, which may be a mobile terminal, a desktop computer, a notebook computer, a palm computer, a server, or other computing devices. The electronic device 600 comprises a processor 601 and a memory 602, wherein the memory 602 has stored thereon a membrane fouling characterization program 603 of a forward osmosis membrane.
The memory 602 may be an internal storage unit of a computer device in some embodiments, such as a hard disk or memory of a computer device. The memory 602 may also be an external storage device of the computer device in other embodiments, such as a plug-in hard disk provided on the computer device, a Smart Media Card (SMC), a secure digital (SecureDigital, SD) Card, a Flash memory Card (Flash Card), etc. Further, the memory 602 may also include both internal storage units and external storage devices of the computer device. The memory 602 is used for storing application software installed on the computer device and various types of data, such as program codes for installing the computer device. The memory 602 may also be used to temporarily store data that has been output or is to be output. In one embodiment, the membrane fouling characterization program 603 of the forward osmosis membrane, when executed by the processor 601, performs the steps of:
acquiring impedance data of the forward osmosis membrane acquired by an impedance analyzer; the impedance data are obtained by carrying out electrochemical impedance analysis on a forward osmosis membrane in a preset electrolytic cell through an impedance analyzer;
constructing an equivalent circuit model of the forward osmosis membrane based on the impedance data, and acquiring inductance data of the forward osmosis membrane according to the equivalent circuit model;
and establishing a probability density function of the inductance data, and determining the pollution degree of the forward osmosis membrane according to the probability density function of the inductance data.
The processor 601 may in some embodiments be a central processing unit (Central Processing Unit, CPU), microprocessor or other data processing chip for executing program code or processing data stored in the memory 602, such as performing a membrane fouling characterization procedure for a forward osmosis membrane, etc.
The present embodiment also provides a computer-readable storage medium having stored thereon a membrane fouling characterization program of a forward osmosis membrane, which when executed by a processor, implements the steps of:
acquiring impedance data of the forward osmosis membrane acquired by an impedance analyzer; the impedance data are obtained by carrying out electrochemical impedance analysis on a forward osmosis membrane in a preset electrolytic cell through an impedance analyzer;
constructing an equivalent circuit model of the forward osmosis membrane based on the impedance data, and acquiring inductance data of the forward osmosis membrane according to the equivalent circuit model;
and establishing a probability density function of the inductance data, and determining the pollution degree of the forward osmosis membrane according to the probability density function of the inductance data.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the various embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.

Claims (5)

1. A method for characterizing membrane fouling of a forward osmosis membrane, comprising:
acquiring impedance data of the forward osmosis membrane acquired by an impedance analyzer; the impedance data are obtained by carrying out electrochemical impedance analysis on a forward osmosis membrane in a preset electrolytic cell through an impedance analyzer;
constructing an equivalent circuit model of the forward osmosis membrane based on the impedance data, and acquiring inductance data of the forward osmosis membrane according to the equivalent circuit model;
establishing a probability density function of the inductance data, and determining the pollution degree of the forward osmosis membrane according to the probability density function of the inductance data;
the equivalent circuit model comprises an equivalent resistance R of electrolyte in the preset electrolytic cell s Equivalent capacitance C of Forward osmosis Membrane 1 Equivalent resistance R of Forward osmosis Membrane m Inductance L of forward osmosis membrane 1 Equivalent resistance R of inductor 1 ；
Wherein, the equivalent resistance Rs and the equivalent capacitance C 1 Series connection of equivalent capacitance C 1 And equivalent resistance R m Parallel, inductance L 1 And equivalent resistance R 1 Is connected in parallel with the equivalent resistor R after being connected in series m Is provided;
the obtaining the inductance data of the forward osmosis membrane according to the equivalent circuit model comprises the following steps:
establishing a state equation of an equivalent circuit model based on kirchhoff voltage law;
obtaining inductance data of the forward osmosis membrane according to a state equation of the equivalent circuit model;
the probability density function of the inductance data has the expression:
in the method, in the process of the invention,Linductance data representing a forward osmosis membrane,f（L) A probability density function representing the inductance data;
determining the pollution degree of the forward osmosis membrane according to the probability density function of the inductance data, which comprises the following steps:
obtaining an error coefficient of inductance data:
combining inductances according to probability density functions of the inductance dataError coefficients of the data, a contamination level expression of the forward osmosis membrane is obtained:wherein, the method comprises the steps of, wherein,Cindicating the degree of fouling of the forward osmosis membrane,Brepresenting the error coefficient of the inductance data.
2. The method for characterizing membrane fouling of a forward osmosis membrane of claim 1, wherein the equation of state of the equivalent circuit comprises:
in the method, in the process of the invention,x 1 representing equivalent capacitance C 1 The voltage across the two terminals of the capacitor,x 2 representing the flow through inductanceL 1 Is used for the current flow of (a),representing the equivalent circuit system voltage, +.>Is thatx 1 First derivative of>Is thatx 2 Is a first derivative of (a).
3. A membrane fouling characterization device for a forward osmosis membrane, comprising:
the impedance acquisition module is used for acquiring impedance data of the forward osmosis membrane acquired by the impedance analyzer; the impedance data are obtained by carrying out electrochemical impedance analysis on a forward osmosis membrane in a preset electrolytic cell through an impedance analyzer;
the inductance acquisition module is used for constructing an equivalent circuit model of the forward osmosis membrane based on the impedance data and acquiring inductance data of the forward osmosis membrane according to the equivalent circuit model;
the pollution degree determining module is used for establishing a probability density function of the inductance data and determining the pollution degree of the forward osmosis membrane according to the probability density function of the inductance data;
the equivalent circuit model comprises an equivalent resistance R of electrolyte in the preset electrolytic cell s Equivalent capacitance C of Forward osmosis Membrane 1 Equivalent resistance R of Forward osmosis Membrane m Inductance L of forward osmosis membrane 1 Equivalent resistance R of inductor 1 ；
Wherein, the equivalent resistance Rs and the equivalent capacitance C 1 Series connection of equivalent capacitance C 1 And equivalent resistance R m Parallel, inductance L 1 And equivalent resistance R 1 Is connected in parallel with the equivalent resistor R after being connected in series m Is provided;
the obtaining the inductance data of the forward osmosis membrane according to the equivalent circuit model comprises the following steps:
establishing a state equation of an equivalent circuit model based on kirchhoff voltage law;
obtaining inductance data of the forward osmosis membrane according to a state equation of the equivalent circuit model;
the probability density function of the inductance data has the expression:
in the method, in the process of the invention,Linductance data representing a forward osmosis membrane,f（L) A probability density function representing the inductance data;
determining the pollution degree of the forward osmosis membrane according to the probability density function of the inductance data, which comprises the following steps:
obtaining an error coefficient of inductance data:
and according to the probability density function of the inductance data, combining the error coefficient of the inductance data to obtain a pollution degree expression of the forward osmosis membrane:wherein, the method comprises the steps of, wherein,Cindicating the degree of fouling of the forward osmosis membrane,Brepresenting the error coefficient of the inductance data.
4. An electronic device comprising a memory and a processor, wherein,
the memory is used for storing programs;
the processor, coupled to the memory, for executing the program stored in the memory to implement the steps in a method for characterizing membrane fouling of a forward osmosis membrane according to any one of the preceding claims 1 to 2.
5. A computer readable storage medium storing a computer readable program or instructions which when executed by a processor is capable of carrying out the steps of a method for characterizing membrane fouling of a forward osmosis membrane according to any one of the preceding claims 1 to 2.
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