212 results about "Electrodeionization" patented technology

The system comprises a raw water tank, a multi-medium filter, a bag filter, a plate heat exchanger, an ultrafiltration device, an ultrafiltration water tank, a primary reverse osmosis device, a secondary reverse osmosis device, a UV (ultraviolet) sterilization device, an EDI (electrodeionization) device, a TOC (total organic carbon) remover, a polishing mixed bed and a terminal filter which are sequentially connected, the RO concentrated water tank is connected with the reverse osmosis concentrated water outlet ends of the primary reverse osmosis device and the secondary reverse osmosis device, the electric driving membrane device is connected with the RO concentrated water tank, and the drainage concentrated water tank is connected with the electric driving membrane device. The reverse osmosis (RO) and electrodeionization (EDI) combined process adopted in the invention comprehensively solves a series of problems of acid and alkali consumption, environmental pollution, poor automation degree, complex system and the like in ultrapure water production. The process equipment disclosed by the invention is relatively high in automation degree, saves the cost required by acid-base regeneration, and does not cause any pollution to the environment.

The utility model discloses a reverse osmosis and EDI equipment combined sodium ion removal device, which comprises a water inlet pipeline group, a water outlet pipeline group and a bottom plate, one side of the outer surface of the water inlet pipeline group is fixedly connected with a water inlet, and one side of the outer surface of the water inlet pipeline group is fixedly connected with a filter. According to the reverse osmosis and EDI equipment combined sodium ion removal device, through the arrangement of the water inlet pipeline group, the water outlet pipeline group, the water inlet, the filter, the high-pressure pump, the water inlet spray head and the reverse osmosis pipe, when the reverse osmosis and EDI equipment combined sodium ion removal device is used, a water source enters the filter from the water inlet, large-particle impurities and organic hard substances of the water source are removed for the first time through the filter; a water source enters the high-pressure pump through the water outlet pipeline set to be pressurized, meanwhile, the pressurized water source enters the reverse osmosis pipes through the water inlet nozzles, organic matter, impurities and sodium ions in water are treated, water treatment is completed, meanwhile, the number of the reverse osmosis pipes is nine, and the situation that the reverse osmosis pipes are damaged due to the fact that the pressure of the water is too large is prevented.

The utility model discloses an EDI (Electrodeionization) membrane stack electrodeionization device, which relates to the technical field of water treatment, adopts a multi-section EDI membrane stack structure for desalting, and comprises an EDI membrane stack, the EDI membrane stack comprises at least one pair of fresh water plate and concentrated water plate which are oppositely arranged, the same number of positive membranes and negative membranes are alternately arranged between the fresh water plate and the concentrated water plate in sequence to form alternate fresh water chambers and concentrated water chambers, and flow guide nets are arranged on the positive membrane sides of the fresh water chambers and the positive membrane sides of the concentrated water chambers. Due to the fact that the flow guide nets are additionally arranged on the cation membrane side of the fresh water chamber and the cation membrane side of the concentrated water chamber, stirring and turbulence of water flow are improved, the concentration polarization phenomenon of the membrane surface caused in the cation migration process of the cation membrane can be avoided, and EDI membrane stack scaling is prevented.

The invention discloses an electrodeionization system intelligent regulation and control method for a hydrogen conductivity meter, which is used for evaluating and intelligently regulating and controlling the structure state and the working state of an electrodeionization system, and comprises the following steps: carrying out automatic working mode parameter identification on the electrodeionization system based on a random subspace identification algorithm and a grid clustering algorithm; the structural state of the electrodeionization system is evaluated and intelligently regulated and controlled based on the automatic working mode parameter recognition result; based on the fact that the structural state of the electrodeionization system is evaluated as healthy or the structural state of the electrodeionization system is evaluated as healthy after intelligent regulation and control, the working state of the electrodeionization system is intelligently regulated and controlled; the working state affects the cation removal efficiency of the electrodeionization system and is related to the resin capacity of a concentrated water chamber, the resin capacity of a fresh water chamber, the ratio of the sectional area to the height of the concentrated water chamber, the ratio of the sectional area to the height of the fresh water chamber, membrane stack voltage, membrane stack current and module inlet water flow. The invention further discloses a system, electronic equipment and a computer readable storage medium.

An electrode water recovery method is an electrode water recovery method for removing hydrogen gas from electrode water generated by passage of water to be treated through a cathode chamber in an electric deionization treatment and recovering the electrode water in an ultrapure water production step, in which the electrode water is sprayed onto a filling material with which a scrubber is filled, an inert gas is supplied from below the filling material to react with the hydrogen gas in the electrode water, a treated gas generated by the reaction is exhausted from an exhaust port above the filling material, and treated water from which the hydrogen gas has been removed is recovered.

The invention relates to the technical field of water treatment and intelligent control, in particular to a multistage collaborative optimization control method for ultrapure water production, which performs dynamic optimization and collaborative control on operation parameters of multistage processes (nanofiltration, reverse osmosis and electrodeionization) by combining a genetic algorithm and a fuzzy logic control technology. The problem of lack of intelligentization, real-time performance and multi-process collaborative optimization in the prior art is solved.

The utility model discloses an anion and cation double-membrane type electrodeionization device. The device internally comprises a cathode chamber, a resin chamber and an anode chamber; the cathode chamber and the resin chamber are isolated by a cation exchange membrane, the anode chamber and the resin chamber are isolated by an anion exchange membrane, and the distance between the two membranes is 10-100cm. According to the utility model, the electric regeneration efficiency of the invalid resin and the quality of subsequent produced water can be obviously improved, electrolyte solution is not consumed, the environmental protection problem is avoided, an electrode water circulating pump can be omitted, and the system and operation management are simplified.

The utility model discloses waste water electro-desalting equipment, which belongs to the technical field of waste water treatment, and comprises a cooling tower and a cooling water tank arranged at the bottom of the cooling tower, the input end of the cooling tower is communicated and connected with a circulating water main pipe, the circulating water main pipe is communicated and connected with a circulating water branch pipe, and the circulating water branch pipe is communicated and connected with a circulating water outlet pipe. The output end of the circulating water branch pipe is connected with an electrochemical water treatment device, a large number of scale inhibition small molecules can be generated in the electrolysis process, a very good scale inhibition effect can be achieved, a dense ferroferric oxide (Fe3O4) protection film can be generated on the surfaces of a system pipeline and the pipe wall of heat exchange equipment by using an electrochemical technology for a long time in a circulating water system, and the service life of the circulating water system is prolonged. The corrosion rate of carbon steel equipment is less than or equal to 0.075; and when the electrochemical water treatment device continuously operates, a circulating water system can safely and stably operate in an energy-saving and zero-pollution manner for a long time.

The invention relates to a portable hydrogen conductivity measuring device based on electrodeionization. The portable hydrogen conductivity measuring device comprises a sampling detection subsystem, an electrodeionization subsystem, a measuring subsystem and a processor, the sampling detection subsystem is communicated with the electrodeionization subsystem and the measurement subsystem and is used for controlling the temperature, the pressure and the flow of sample water flowing into the electrodeionization system; the electrodeionization subsystem is communicated with the measurement subsystem and is used for removing cations in the sample water; the measurement subsystem is communicated with the electrodeionization system and is used for accurately measuring the conductivity, namely the hydrogen conductivity, of the sample water subjected to EDI treatment in real time; and the processor is used for providing a stable excitation signal for the conductivity electrode, acquiring an original resistance or conductivity signal and a temperature signal of the electrode, executing a temperature compensation algorithm to obtain a hydrogen conductivity value at 25 DEG C, outputting a final result to the display screen, and transmitting the final result to an external system. The invention also discloses a corresponding measurement method, electronic equipment and a computer readable storage medium.

The invention provides a regenerated accumulated nuclide electrodeionization membrane stack test method and system. The test method comprises the following steps: step 1, carrying out nuclide measurement on a to-be-treated EDI membrane stack; 2, a regeneration agent is continuously introduced into the EDI membrane stack to be treated, the radionuclide content in the EDI membrane stack to be treated is monitored in real time till the radionuclide content in the EDI membrane stack to be treated meets the requirement, and then the amount of the introduced regeneration agent and concentration change data of all kinds of nuclides are recorded; and 3, introducing ultrapure water into the to-be-treated EDI membrane stack meeting the preliminary regeneration monitoring requirement for fine regeneration until data acquired by the energy disperse spectroscopy meet the standard, thereby obtaining the regenerated EDI membrane stack. According to the test method for the regenerated accumulated nuclide electrodeionization membrane stack, the regeneration agent and the ultrapure water are sequentially introduced into the to-be-treated EDI membrane stack and monitored, so that the regeneration operation condition of the EDI membrane stack can be monitored in real time, and the content of the regeneration agent can be adjusted according to the test progress.

To provide a pure water recycling apparatus capable of removing ions from concentrated water discharged from electric regeneration type ion exchange means to reproduce pure water and making pure water replenishment unnecessary.SOLUTION: A pure water recycling apparatus 1 comprises: a tank 10 for storing machining waste water discharged from a grinding device (grinder) 100 that receives supplied pure water to machine a workpiece; a machining chip removal filter 20 that removes machining chips from the machining waste water supplied from the tank 10 to generate fresh water; an ultraviolet ray irradiation unit 30 that irradiates the fresh water with an ultraviolet ray; and an electrodeionization exchange unit 40 that removes organic ions contained in the fresh water through electrodialysis to generate pure water. A distilled water generation unit 50 is provided to evaporate the concentrated water discharged from the electrodeionization exchange unit 40 to generate distilled water. The distilled water is returned together with the pure water to the grinding device 100.SELECTED DRAWING: Figure 1

The invention discloses a hydrogen conductivity electric regeneration ion exchange system, and relates to the field of hydrogen conductivity. The hydrogen conductivity electric regeneration ion exchange system comprises an EDI module main body, a sample injection valve, a filter, a measuring cell and a flow meter. According to the hydrogen conductivity electro-regeneration ion exchange system, a detected water sample enters the EDI module main body, cations are exchanged into hydrogen ions under the exchange action of cation exchange resin, the anode is subjected to an oxygen evolution reaction to generate the hydrogen ions, and the generated hydrogen ions move towards the cathode under the action of an electric field; in the operation process, the system continuously carries out cation adsorption-regeneration, the advanced electrodeionization technology is adopted, the cations in water vapor are efficiently removed, automatic regeneration of the EDI resin is achieved, dynamic balance is maintained, and manual regeneration of the resin is not needed.

The invention provides an ultrafiltration reverse osmosis electrodeionization desalting water system, which belongs to the technical field of pure water treatment, and comprises a mounting rack, an EDI filter assembly, a control assembly and a water supply assembly, and also comprises a connecting mechanism, a buffer mechanism and an adjusting mechanism. Through the arrangement of the buffer mechanisms, when liquid enters the connecting pipes, the liquid can enter the corresponding channels, at the moment, the arc-shaped plates can make contact with water flow, the multiple arc-shaped plates at the bottom of the same connecting belt can be far away from one another under the action of the impact force and pressure of the water flow, then the bottoms of the channels are opened, the elastic layers are stretched, and in the process, the elastic layers are separated from one another. Due to the fact that water flow firstly makes contact with the arc-shaped plate and can be buffered through the arc-shaped plate and the elastic layer, impact force of the water flow can be reduced, the water flow can be prevented from making direct contact with the positive membrane and the negative membrane, the phenomenon that the positive membrane and the negative membrane are perforated due to too large impact force is prevented, and the service life of the positive membrane and the negative membrane is prolonged.

The present invention relates to the technical field of the preparation of electrochemical materials, and particularly to a system and process for obtaining micro-nano platinum particles by a mechanical method, including a production system. The production system includes a blade cutting machine, which is connected by a pipeline to a spiral vibrating screen. The spiral vibrating screen is cooperatively provided with a crucible for storing materials. The production system is also cooperatively provided with a reverse osmosis electrodeionization device system. The crucible is cooperatively provided with a liquid nitrogen storage tank and a material-liquid mixing chamber. The material-liquid mixing chamber is cooperatively provided with a reaction kettle. The material-liquid mixing chamber is connected by a pipeline to a crusher. The crusher is cooperatively provided with a suspension filter. The suspension filter is connected to a low-temperature vacuum dryer. The low-temperature vacuum dryer is connected to a tubular furnace. The tubular furnace is cooperatively provided with a grinder. A screening machine is provided on one side of the grinder. By precisely controlling the parameters of each step, the present invention ensures the high purity and high quality of the product, and at the same time improves the production efficiency and product performance.

The invention discloses an electrodeionization device for preparing ultrapure water, and relates to the technical field of water treatment.The electrodeionization device comprises a shell, an electrodeionization cavity, a cathode chamber, an anode chamber and a cation replacement module, a deionization module is arranged between the cation replacement module and the cathode chamber, and a concentrated water chamber is arranged between the deionization module and the cation replacement module; the deionization module comprises a first cation exchange membrane, a decation fresh water chamber, a first bipolar membrane, a deanion fresh water chamber and a first anion exchange membrane which are arranged in sequence, and the cation replacement module comprises a second cation exchange membrane, a cation replacement chamber, a third cation exchange membrane, an ion supply chamber and a second anion exchange membrane which are arranged in sequence; to-be-treated water sequentially flows through the cation replacement chamber, the deanion fresh water chamber and the decation fresh water chamber, and a strong acid and strong alkali salt solution is contained in the ion supply chamber. The device has the advantages of efficiently removing soluble acid gas, reducing the scaling risk of the concentrated water chamber and improving the resistivity of produced water.

Water to be treated (supplied water) (W4) having a pH of 8 or more is supplied to an electrodeionization device (8), and the water to be treated (W4) is supplied to a desalination chamber (25) of the electrodeionization device (8). Then, desalted water (W5) that has passed through the desalination chamber (25) is separated and supplied to the concentration chamber (26) in the opposite direction to the desalination chamber (25). As a result, even if the pH of the water to be treated (water supply) (W4) is 8 or more, the ion concentration in the water to be concentrated in the concentration chamber (26) is lower toward the extraction side of the desalination chamber (25). In particular, the movement of inorganic carbonate ions from the concentration chamber (26) near the outlet of the desalination chamber of the electrodeionization device (8) to the desalination chamber (25) can be reduced, and a decrease in the electrical resistivity of the desalted water (W5) can be prevented. According to this method for operating an electrodeionization device, it is possible to efficiently produce high-quality treated water even if water having a high pH is supplied to the electrodeionization device.

The invention discloses a method and a system for preparing normal-temperature water for injection, and relates to the technical field of preparation of water for injection. According to the method and system for preparing the normal-temperature injection water, purified water serves as an initial water source and enters a purified water tank, after water in a purified water storage tank is pumped out through a circulating pump, pathogenic microorganisms are killed through irradiation of an ultraviolet lamp, suspended impurities of the purified water are intercepted based on a 0.45-micron filter, heat sources in the water are filtered through an ultrafiltration membrane after the water is subjected to continuous electrodeionization, and the normal-temperature injection water is obtained. After residual impurities are removed, the temperature is adjusted based on the heat exchanger, and produced water enters an injection water storage tank. Through the combined design of cooperative sterilization of the terminal ultrafiltration membrane and the ultraviolet device, the removal effect on colloidal particles and pathogenic microorganisms is enhanced, the load on the terminal ultrafiltration membrane is reduced, frequent disinfection and replacement of the membrane are not needed, the equipment maintenance frequency and the consumable cost are reduced, and meanwhile, the shutdown risk caused by membrane pollution is avoided.

A method for the purification of a reaction crude can include employing one or more electrodeionization modules each including a cathode, an anode, and at least one ion-depletion compartment interposed between pairs of ion-concentration compartments. Each ion-concentration compartment can contain an ion-exchange medium. The method can include passing a reaction crude through each ion depletion compartment. The reaction crude can be produced from a process including at least one ionic species. The method can include supplying current between the anode and the cathode. The method can include recovering an ion-depleted stream from each ion-depletion compartment. The method can include recovering the ionic or ionizable species from each ion-concentration compartment.

This pure water production apparatus comprises a reverse osmosis membrane and an electrodeionization device 2. In the electrodeionization device 2, anion exchange membranes 11 and cation exchange membranes 12 are alternately arranged between an anode plate 15 and a cathode plate 16, and by constituting compartments with the anion exchange membranes 11 and the cation exchange membranes 12, a desalting chamber 13 and a concentration chamber 14 are formed, and an anode chamber and a cathode chamber are formed at respective ends. As feed water to the desalting chamber 13, permeated water W1 from a reverse osmosis membrane device 1 is supplied to the desalting chamber 13 to obtain treated water W2. Further, as feed water W3 to the concentration chamber 14, permeate from the reverse osmosis membrane device 1 is supplied, and concentrated water W4 is discharged. In the electrodeionization device 2, the desalting chamber 13 is filled with substantially 100% by weight of an anion exchange resin. According to this pure water production apparatus, the removal efficiency of weak acid ions such as boron and silica can be improved without using chemicals.

The utility model discloses a device for accurately monitoring damage of EDI (electrodeionization) desalting equipment due to water shortage. The device comprises a plurality of bubble removing mechanisms which are assembled and communicated at the water outlet end of the EDI desalting equipment, the bubble removing mechanism comprises a shell, a bubble removing assembly is rotationally connected into the shell, the bubble removing assembly comprises inner rolling bearings arranged on the two sides at intervals, and a plurality of obliquely-arranged bubble removing plates are fixedly connected to inner rings of the inner rolling bearings correspondingly. Fixed end seats are fixedly connected between the outer ends of the bubble removing plates, and a connecting shaft is fixedly connected between the fixed end seats; the connecting shaft is fixedly connected with a driving impeller for driving the bubble removing assembly to rotate; water carrying a large number of bubbles enters the shell to push the bubble removing plate to rotate, so that the bubbles are broken and removed; and the water outlet end of the bubble removing mechanism is assembled and communicated with a water outlet pipe. In this way, a large amount of bubbles are removed, the measurement accuracy of the flowmeter is improved, and the water yield of the water outlet end of the equipment is accurately monitored.

In an electrodeionization device, a concentration compartment and a desalting compartment are defined by ion exchange membranes between a positive electrode and a negative electrode; concentrated water is caused to flow into the concentration compartment; water to be treated is caused to flow into the desalting compartment and is extracted as deionized water; and part of the deionized water is caused to flow as concentrated water into the concentration compartment in a direction opposite the flow direction of the desalting compartment. Water supplied to the electrodeionization device is treated using a water softener, an RO device, and a membrane degassing device, and the total concentration of Ca ions and Mg ions is 50 μg / L or lower.

The utility model provides a treatment system for purifying circulating water of a surface type indirect air cooling unit, which comprises a current limiter, the current limiter is connected with a circulating water supply main pipe of the indirect air cooling unit, the current limiter is connected with a de-ironing separator, the de-ironing separator is connected with a membrane-free electric deionizer, the membrane-free electric deionizer is connected with a water outlet main isolating valve, and the water outlet main isolating valve is connected with a water outlet main isolating valve. The water outlet main isolating valve is connected with a circulating water supply main pipe of the indirect air cooling unit; a detector is arranged on a pipeline for connecting the membrane-free electric deionizer and the water outlet main isolating valve; a recirculation valve is connected between the water outlet main isolating valve and the iron remover; and the recirculation valve and the water outlet main isolating valve are in signal connection with a detector. According to the system, iron-containing oxides in the circulating water are removed through the iron remover, corrosion products in the circulating water are reduced, the circulating water is purified again through the membrane-free electric deionizer, the quality of the circulating water is further improved, efficient purification of the circulating water is achieved, and the stability and economical efficiency of system operation are remarkably improved.

An electrodeionization device (1) is provided with sub-blocks (3A-3F) in parallel between frames (2) and (2), the sub-blocks (3A-3F) forming a plurality of pairs of desalination chambers and concentration chambers. Water supply ports (4A), (4B) for disposing a water supply line (4) through which the water (W1) to be treated is introduced are formed at both ends of the upper side of the subblocks (3A)-(3F). Concentrated water supply ports (6A, 6B) are formed at both ends of the lower side of the unit, said concentrated water supply ports (6A, 6B) being provided with a concentrated water supply line (6) through which concentrated water (W3) is introduced into the concentration chamber. Water to be treated (W1) can be supplied from the water supply ports (4A, 4B) via the water supply line (4) from the upper side of each desalination chamber, and discharged from the treated water outflow ports (5A, 5B) via the treated water outflow line (5) from the lower side of each desalination chamber. In addition, concentrated water (W3) can be supplied from the concentrated water supply ports (6A, 6B) via the concentrated water supply line (6) from the lower side of each concentration chamber, and concentrated drainage (W4) can be discharged from the concentrated drainage outflow ports (7A, 7B) via the concentrated drainage outflow line (7) from the upper side of each concentration chamber. This electrodeionization device makes it possible to efficiently produce high-quality treated water.

The electro-deionized water production system (EDI system) can be assembled quickly without requiring skilled labor. [Solution] The assembly equipment for assembling an EDI device in which both the desalination chamber and the concentration chamber are composed of a frame having openings and ion exchange resin is filled in the openings includes a membrane extraction robot 60 that has the function of extracting the ion exchange membrane 30 stored in water, a handling robot 50 that has the function of transporting the frame 40 and placing it on the work area, receiving the ion exchange membrane 30 extracted by the membrane extraction robot 60 and transporting it to the work area, and a resin supply robot 70 that has the function of filling the openings of the frame 40 placed on the work area with ion exchange resin. After the handling robot 50 has finished filling the openings of the frame 40 with ion exchange resin, it positions the ion exchange membrane 30 so as to cover the filled ion exchange resin.

In the present invention, in a primary pure water device (3), a DC power supply (9A) is attached to an electrodeionization device (9) connected to a water supply pump (8), and the desalted water (W2) of the electrodeionization device (9) can be supplied to a sub-tank (11). A liquid level switch (21) is provided in the sub-tank (11). In addition, a control valve (23) and a flow meter (24) are provided on the flow path (22) of the desalted water (W2) of the electrodeionization device (9), and a control valve (26) and a flow meter (27) are also provided on the flow path (25) of the concentrated water (W5) of the electrodeionization device (9). Furthermore, the measurement data of the liquid level switch (21) and the flow meter (24, 27) can be sent to a control device (28), and the water supply pump (8) and the control valve (23, 26) can be controlled. In this way, a control method for an ultrapure water manufacturing device capable of manufacturing primary pure water according to the usage of the subsystem is provided.

A water preparation apparatus for determining an amount of total chlorine in purified water is disclosed. The water preparation apparatus includes a chlorine sensing system, a water pretreatment filter, a reverse osmosis filter, and an electrodeionization (“EDI”) module. The chlorine sensing system is configured to determine an amount of total chlorine in the purified water by applying, at a first time, a source voltage to the purified water and removing, at a second time, the source voltage. The chlorine sensing system then measures, after the second time, an electrical parameter of the purified water. The chlorine sensing system determines the amount of total chlorine in the purified water based on the measured electrical parameter.

The invention relates to the technical field of wastewater treatment, and particularly discloses a purification treatment process for liquid crystal panel factory developing liquid waste. The purification treatment process for the liquid crystal panel factory developing solution waste liquid comprises the following steps: S1, adding a composite acid precipitation solution into the developing solution waste liquid, and meanwhile, carrying out ultraviolet irradiation treatment to obtain a suspension; s2, adding an amphiphilic coagulant aid into the suspension, stirring for reaction, and standing; the amphiphilic coagulant aid is an acrylamide-dimethyl diallyl ammonium chloride-glycidyl methacrylate terpolymer, and the amphiphilic coagulant aid is an acrylamide-dimethyl diallyl ammonium chloride-glycidyl methacrylate terpolymer; s3, carrying out centrifugal separation on the solution system after standing in S2 to obtain a tetramethyl ammonium salt solution; and S4, converting the tetramethyl ammonium salt solution into a TMAH solution by using bipolar membrane electrodeionization equipment. According to the treatment process, the purification and removal effect on the photoresist in the waste developing solution is effectively improved, and the recycling reliability of the TMAH is effectively enhanced.

A method for operating a deionized water production system for producing deionized water from water to be treated using an electrodeionization device includes: providing a water intake mode, in which the water to be treated is passed through a demineralization chamber of the electrodeionization device without energizing the electrodeionization device to obtain treated water, and a water intake and regeneration mode, which is operated alternately with the water intake mode and in which treated water is passed through the demineralization chamber to obtain treated water while the electrodeionization device is energized, and water is further passed through at least one of a concentration chamber and an electrode chamber of the electrodeionization device; and operating the electrodeionization device such that the operation time of the water intake mode is 1.5 to 6.4 times the operation time of the water intake and regeneration mode.

Provided is a method for operating an electric deionization apparatus in which a concentration chamber and a desalination chamber are formed by arranging a plurality of anion exchange membranes and cation exchange membranes between a positive electrode and a negative electrode, and the desalination chamber is filled with an ion exchanger. The electric deionization apparatus is operated under the conditions that satisfy the following formulae (1), (2), and (3).　(1): 50 < A < 200, (2): AA / CDout < 0.2, (3): AA = D × (Cc × A) / dx) × Q × 103 (ng / L) According to this method for operating an electric deionization apparatus, the removal rate of weak electrolytes such as boron is increased, and treated water of high water quality can be obtained.

The embodiment of the invention relates to the technical field of wastewater treatment of an electrodeionization device, in particular to a method for removing radionuclide ions in low-radioactivity waste liquid and the electrodeionization device, and the method comprises the following steps: switching on a power supply of the electrodeionization device to form a first electric field between a cathode and an anode of the electrodeionization device; under the action of the first electric field, positive ions in the radioactive waste liquid are migrated to a cathode of the electric deionization device, and the positive ions in the migration process are removed by utilizing an ion adsorption module of the electric deionization device, so that a water purification area is formed; under the action of the first electric field, anions in the radioactive waste liquid are migrated to the anode of the electric deionization device, and the anions in the migration process are stopped by using an ion adsorption module to form an anion enrichment area; and separating and collecting the liquid in the water purification area and the liquid in the anion enrichment area to obtain the liquid in which the radionuclide ions are removed. The method can effectively remove radionuclide ions and is high in efficiency.