Showing papers on "Electrodeionization published in 2019"
TL;DR: In this paper, the integration of fermentation and the electro-membrane process can improve the acid recovery with lower byproduct concentration and energy consumption, which can be used to achieve cost effective production of organic acids.
Abstract: With an increase in the organic acid requirement, the production of organic acids has been increased over the years. To achieve cost-effective production of organic acids, efficient recovery processes are needed. Electro-membrane processes, including electrodialysis (ED), electrometathesis (EMT), electro-ion substitution (EIS), electro-electrodialysis (EED), electrodialysis with bipolar membrane (EDBM), and electrodeionization (EDI), are promising technologies for the recovery of organic acids. In the electro-membrane processes, organic acids are separated from water and other impurities based on the electro-migration of ions through ion-exchange membranes. These processes can recover various types of organic acids from the fermentation broth with high recovery yield and low energy consumption. In addition, the integration of fermentation and the electro-membrane process can improve the acid recovery with lower byproduct concentration and energy consumption.
82 citations
TL;DR: The CDI-EDI technique could not only ensure stable effluent and lower regenerations cost, but also enrich heavy metal from regeneration fluid to achieve resource recovery and have obvious implications in treatment of low-content and salt-containing heavy metal wastewater with high efficiency and low energy consumption.
41 citations
TL;DR: In this paper, the influence of acid-base properties of inorganic particles in ion exchange membrane-based nanocomposites on their physicochemical and transport properties was investigated, and a new approach to cross-linking of ion exchange membranes by incorporating ZrO2 particles into their matrix is proposed.
Abstract: In the present paper, the influence of acid–base properties of inorganic particles in ion-exchange membrane-based nanocomposites on their physicochemical and transport properties was investigated. For this purpose, particles of Zr, Ti, and Si oxides have been synthesized in situ in the system of pores and channels of the membranes. Depending on the acid–base properties of oxides, introduction of nanoparticles can increase or decrease the water uptake, conductivity, and selectivity. A new approach to cross-linking of ion-exchange membranes by incorporating ZrO2 particles into their matrix is proposed. Such cross-linking provides an improvement of swelling, conductivity, and salt permselectivity of the membrane in Na+-form. These parameters are important for successful application of such materials in direct and reverse electrodialysis, electrodeionization, and diffusion dialysis. For example, incorporation of 10 wt% of zirconia leads to a “cross-linking” of the membrane, i.e., binding of 45–50% of sulfonic groups, accompanied by a decrease of the water uptake by more than twofold and an increase of apparent transport numbers.
26 citations
TL;DR: In this article, the performance of Membrane-free elctrodeionization (MFEDI) is improved by the introduction of phosphonic acid resins and the mechanism of electrical regeneration.
19 citations
TL;DR: In this article, ultrafiltration and electrodeionization (EDI) membranes were used for purification of xylitol from either model solution or OPEFB hydrolysate that has been fermented by Debaromyces Hansenii.
18 citations
TL;DR: In this article, a novel deep desalination and anti-scaling EDI stack configuration was proposed, where a cation exchange membrane was added to the right side of the reverse anode exchange membrane to form a protective chamber, in which mixed bed ion exchange resin was filled with a certain proportion.
12 citations
TL;DR: In this paper, anion exchange resin with hydrated zirconium dioxide was used to obtain organic-inorganic sorbent with nonaggregated nanoparticles, which increased the electrical conductivity of the resin from 0.011 to 0.038 Ohm-1m 1m 1.
7 citations
TL;DR: In this paper, an improved stack configuration was used to prevent nickel hydroxide precipitation and phosphonic acid resin was adopted for adjusting the pH to neutral, and the results showed that the increase of current density and flow rate resulted in better electrical regeneration effect.
6 citations
TL;DR: In this article, the performance of CEDI stacks on the removal of three different trace nuclides: Cs(I), Sr(II), and Co(II) was measured.
Abstract: Nuclear power plants produce low-level radioactive wastewaters (LLRW) that contain radioactive nuclides. Prior to discharge, these radioactive nuclides need to be safely and efficiently removed. Continuous electrodeionization (CEDI) has shown potential for the treatment of LLRW. Here, we measured the performance of CEDI stacks on the removal of three different trace nuclides: Cs(I), Sr(II) and Co(II). Our results indicated that Cs(I) and Sr(II) actively migrated in the resin particles and were distributed in the resin profile according to the applied electric field. Nuclide removal was improved by increasing the working current. At a working current of 0.5 A, the removal efficiencies of Cs(I), Sr(II), and Co(II) amounted to 99.7%, 98.1%, and 77.1%, respectively. However, excessive working current resulted in the hydrolysis and formation of Co(OH)2, which deposited on the surface of the cation exchange resin. The adsorption rate of Cs(I), Sr(II), and Co(II) for the resin was in the following order: Cs(I) > Sr(II) > Co(II). This order was also positively related to the removal efficiency of the CEDI stack. However, we found no significant relationship between resin adsorption capacity and CEDI removal efficiency.
6 citations
TL;DR: High purity water, which is needed by many industrial plants, especially energy, chemical, pharmaceutical and electronics, can now be produced with fully electrical energy without the need for chemical regeneration by acid and caustic thanks to the Electrodeionization (EDI) technology instead of the classical “Miksbed resin” systems.
4 citations
Patent•
06 Sep 2019
TL;DR: In this article, a deep treatment system and method for reusing drainage water of a coal mine for supplemental water of the power station boiler is presented, which includes a deironing aeration reaction system, flocculation sedimentation tank, an agent addition system, a clarification water pond, a first-level manganese sand filter, a second-level receiving water tank, and a second level sand filter.
Abstract: The invention discloses a deep treatment system and method for reusing drainage water of a coal mine for supplemental water of a power station boiler. The system comprises a deironing aeration reaction system, a flocculation sedimentation tank, an agent addition system, a clarification water pond, a first-level manganese sand filter, a first-level receiving water tank, a second-level manganese sand filter, a second-level receiving water tank, a ceramic membrane ultrafiltration device, an ultrafiltration water tank, a first-level reverse osmosis agent addition system, a first-level reverse osmosis device, a carbon dioxide removal system, a second-level reverse osmosis alkali addition device, a second-level reverse osmosis device, a second-level fresh water tank, an electrodeionization device, a desalting water tank and a concentrated water recycling system. According to the deep treatment system and method, ferro-manganese, suspended solids, colloid particles and anions and cations in the drainage water of the coal mine can be effectively removed, and the demand for the water quality of the supplemental water of the power station boiler is met.
01 Jul 2019
TL;DR: In this paper, a water purification system design based on modern techniques for equipment is presented according to ASTM standards and a new methodology for complex analysis of quality data after each purification section in order to manage all possible need in the water for the power plant.
Abstract: This article provides the detailed optimization processes and enhancement, in the field of water treatment systems, for the energy sector needs. The developing of the unique water purification system design based on modern techniques for equipment is presented according to ASTM standards. As well as the project proposes a new methodology for complex analysis of quality data after each purification section in order to manage all possible need in the water for the power plant. The analysis allows producing the more accurate selection of the filter systems, thereby prevent failures of such sophisticated and expensive equipment as reverse osmosis and continuous electrodeionization.
Patent•
18 Oct 2019
TL;DR: In this paper, the utility model provides a mixed water tank for water purification equipment, which includes: a raw water tank storing tap water from a municipal water supply system; the filtering device is used for carrying out at least one treatment of sand filtration, carbon filtrations, softening and precision filtraction on the water from the raw water tanks; the ultrafiltration membrane group filter is provided with a melt-blown filter element and is used to filtering water from filtering device; the reverse osmosis membrane component is employed for filtering water through reverse Osm
Abstract: The utility model provides a mixed water tank for water purification equipment. The water purification apparatus includes: a raw water tank storing tap water from a municipal water supply system; thefiltering device is used for carrying out at least one treatment of sand filtration, carbon filtration, softening and precision filtration on the water from the raw water tank; the ultrafiltration membrane group filter is provided with a melt-blown filter element and is used for filtering water from the filtering device; the reverse osmosis membrane component is used for filtering water from the ultrafiltration membrane group filter through reverse osmosis; the electrodeionization device is used for filtering water from the reverse osmosis membrane assembly; and the mixing water tank comprisesmore than two inlets for introducing water from more than two of the filtering device, the ultrafiltration membrane group filter, the reverse osmosis membrane component and the electrodeionization device, a stirrer, stirring blades extending into the liquid level, and nozzles, and each inlet is connected with a nozzle arranged in the mixing water tank. By using the water purification equipment disclosed by the utility model, purified water mixed in different proportions can be provided for users according to the requirements of the users so as to meet different requirements.
Patent•
08 Jul 2019
TL;DR: In this article, an electrodeionization (EDI) apparatus having excellent boron removal efficiency is described. But the present paper relates to an EDI module and system having excellent BORON removal efficiency by producing ultrapure water.
Abstract: The present invention relates to an electrodeionization (EDI) apparatus having excellent boron removal efficiency. More particularly, the present invention relates to an EDI module and system having excellent boron removal efficiency by producing ultrapure water by mixing boron-selective ion exchange resins in an appropriate ratio with ion exchange resins present in the EDI.
Patent•
11 Jan 2019
TL;DR: In this article, an ultrapure water purification process which comprises of a pretreatment unit, a membrane system unit, and an end filter is composed of a tank, a 0.22 micron filter element and a pressure gage.
Abstract: The invention discloses an ultrapure water purification process which comprises the following specific steps: (1) a pretreatment unit: adopting quartz sand filtration, activated carbon filtration andcartridge filtration as pretreatment of two-stage reverse osmosis; (2) a membrane system unit: responsible for removing most of the harmful substances out of water to ensure that final produced watermeets the standard requirement; adopting pH regulation assisted two-stage reverse osmosis as a primary desalting process, and taking an EDI (Electrodeionization) module to serve as a deep desalting process; (3) a water supply unit: performing 254nm ultraviolet sterilization, polished and mixed bed desalination and 0.22 micron filtration in a pure water supply cycle, and meeting the purified waterquality requirements of users; and (4) an end filter: the end filter is composed of a tank, a 0.22 micron filter element and a pressure gage. The ultrapure water purification process disclosed by theinvention has the advantages that the process flow is simple, the configuration is reasonable and effective, and the treatment efficiency is high.
01 Jan 2019
TL;DR: A list of ABBREVIATIONS and SYMBOLS can be found in this paper, along with a table of contents and a list of attributes and figures of figures.
Abstract: ................................................................................................................................... ii DEDICATION ............................................................................................................................... iii LIST OF ABBREVIATIONS AND SYMBOLS .......................................................................... iv ACKNOWLEDGMENT................................................................................................................ vi TABLE OF CONTENTS .............................................................................................................. vii LIST OF TABLES .......................................................................................................................... x LIST OF FIGURES ....................................................................................................................... xi CHAPTER 1 ................................................................................................................................... 1
Patent•
30 Jul 2019
TL;DR: In this paper, an electrodeionization (EDI) dialyzer is described, which consists of a body, a partition plate and an outer frame, and the bottom of the partition plate is fixedly connected with the bottom wall of the inner wall of an EDI body, and two sides of the outer frame are connected with clamping plates through buffer springs.
Abstract: The invention discloses an electrodeionization (EDI) dialyzer, and relates to the technical field of electrodeionization. The dialyzer comprises a dialyzer body, a partition plate and an outer frame,and the bottom of the partition plate is fixedly connected with the bottom of the inner wall of the dialyzer body; the inner wall of the outer frame is fixedly connected with a separation net, and thetwo sides of the inner wall of the separation plate are both provided with a fixing groove; the two sides of the outer frame are fixedly connected with clamping plates through buffer springs; the sides, away from the outer frame, of the clamping plates penetrate through the fixing grooves and extend into the fixing grooves; movable grooves are formed in the tops and the bottoms of the fixing grooves and in the partition plate. According to the electrodeionization (EDI) dialyzer, the separation net and the separation plate can be conveniently disassembled and assembled, the separation plate can be used many times, the problem that the economic cost is easily increased due to welding is solved, certain resources are saved, certain working intensity is reduced for workers, and the practicability of the electrodeionization dialyzer is greatly improved.
Patent•
15 Nov 2019
TL;DR: In this article, a method for treating fluorine-containing reuse water is presented. But the method comprises the following specific steps: (1) pretreatment; (2) flocculation precipitation; (3) filtration-reverse osmosis membrane filtraction; (4) total organic carbon (TOC) degradation and ultraviolet sterilization; (5) electrodeionization (EDI) treatment; (6) TOC degradation, and (7) precise filtering.
Abstract: The invention discloses a method for treating fluorine-containing reuse water. The method comprises the following specific steps: (1) pretreatment; (2) flocculation precipitation; (3) filtration-reverse osmosis membrane filtration; (4) total organic carbon (TOC) degradation and ultraviolet sterilization; (5) electrodeionization (EDI) treatment; (6) TOC degradation and ultraviolet sterilization; and (7) precise filtration. The invention has the advantages that water quality of an effluent can reach a standard of ultra-pure water, fluorine removal efficiency is high, the recycling rate of wastewater is high, and operation cost is low.
01 Jan 2019
TL;DR: The most widespread use of ion-exchange process is in the water treatment industry; seawater and brackish water desalination, water softening, removal of heavy metals, harmful ions and dissolved organic contaminants as mentioned in this paper.
Abstract: Beverage industries including water treatment industry, employ ion-exchange chromatography in different forms in several processes to remove chemicals, ions, additives, colourants or harmful substances from drinks. The ion-exchange materials employed are nonreactive and physiochemically stable, and therefore, are a suitable choice for beverage treatment. The most widespread use of ion-exchange process is in the water treatment industry; seawater and brackish water desalination, water softening, removal of heavy metals, harmful ions and dissolved organic contaminants. The ion-exchange chromatography used in these industrial processes is the courtesy of the processes: electrodialysis and electrodeionization, both of which use ion-exchange membranes and the latter use ion-exchange resins also. Excessive organic acids are removed from acidic fruit juices and wine using the same ion-exchange techniques. Electrodialysis and electrodeionization, along with their modifications and combination with other membrane filtration techniques, prove to be the most efficient in beverage treatment for best quality control.
Patent•
06 Sep 2019
TL;DR: In this paper, an anode, and three spaced apart membranes located between the anode and the cathode: a first cation exchange membrane, a first anion exchange membrane and a second ion exchange membrane.
Abstract: Electrodeionization apparatuses, systems including a reactor system and an electrodeionization system, and methods of purifying acetic acid are provided herein. In some embodiments, the electrodeionization apparatus includes an anode, and three spaced apart membranes located between the anode and the cathode: a first cation exchange membrane, a first anion exchange membrane, a second cation exchange membrane, defining: a first electrode rinse passage between the anode and the first cation exchange membrane, a first concentrate passage between the first cation exchange membrane and the first anion exchange membrane, a feed stream passage located between the first anion exchange membrane and the second cation exchange membrane, and a second electrode rinse passage between the second cation exchange membrane and the cathode. In some embodiments, the electrodeionization apparatus also includes at least one propionate -selective ion exchange resin wafer within the feed stream passage.
Patent•
05 Sep 2019
TL;DR: In this article, an anode, and three spaced apart membranes located between the anode and the cathode: a first cation exchange membrane, a first anion exchange membrane and a second ion exchange membrane.
Abstract: Electrodeionization apparatuses, systems including a reactor system and an electrodeionization system, and methods of purifying acetic acid are provided herein. In some embodiments, the electrodeionization apparatus includes an anode, and three spaced apart membranes located between the anode and the cathode: a first cation exchange membrane, a first anion exchange membrane, a second cation exchange membrane, defining: a first electrode rinse passage between the anode and the first cation exchange membrane, a first concentrate passage between the first cation exchange membrane and the first anion exchange membrane, a feed stream passage located between the first anion exchange membrane and the second cation exchange membrane, and a second electrode rinse passage between the second cation exchange membrane and the cathode. In some embodiments, the electrodeionization apparatus also includes at least one propionate-selective ion exchange resin wafer within the feed stream passage.
Patent•
09 Jul 2019
TL;DR: In this article, a continuous electrodeionization (EDI) wide water temperature module is presented, which consists of a pressing plate, an anode, a plurality of in-parallel EDI units, a cathode, and a plate in sequence.
Abstract: The invention discloses a continuous electrodeionization(EDI) wide water temperature module. The module comprises a pressing plate, an anode, a plurality of in-parallel EDI units, a cathode, and a pressing plate in sequence; each EDI unit is composed of one cation exchange membrane, one anion exchange membrane and mixed ion exchange resin filled between the cation exchange membrane and the anion exchange membrane, two adjacent EDI units are separated by using one partition plate, and the anion and cation exchange membranes of two adjacent EDI units form one concentrated-water chamber; and eachcation exchange membrane and one corresponding anion exchange membrane in each EDI unit form one fresh-water chamber. According to the module provided by the invention, the filling amount of polishing mixed resin in the fresh-water chambers is increased, the ion exchange membranes have low surface resistance and good permselectivity, so that the regeneration time of the continuous electrodeionization module is short, and the produced-water quality is good; the ion exchange membranes have low surface resistance, so that power consumption of the whole continuous electrodeionization module is reduced, wherein the power consumption of the whole continuous electrodeionization (EDI) module is reduced by 15%; and the outflow water resistivity of the continuous electrodeionization (EDI) module is0.054 [mu]s/cm when the inflow water conductivity is 60 [mu]s/cm, and the desalting rate is >99%.