US20080067069A1 - Low scale potential water treatment - Google Patents

Low scale potential water treatment Download PDF

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US20080067069A1
US20080067069A1 US11/767,438 US76743807A US2008067069A1 US 20080067069 A1 US20080067069 A1 US 20080067069A1 US 76743807 A US76743807 A US 76743807A US 2008067069 A1 US2008067069 A1 US 2008067069A1
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compartment
concentrating
depleting
canceled
electrodeionization
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US11/767,438
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Joseph Gifford
John Arba
Evgeniya Freydina
Anil Jha
Li-Shiang Liang
Lu Wang
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Siemens Industry Inc
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Siemens Water Technologies Corp
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Priority to US80550506P priority
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Priority to US11/767,438 priority patent/US20080067069A1/en
Assigned to SIEMENS WATER TECHNOLOGIES CORP. reassignment SIEMENS WATER TECHNOLOGIES CORP. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WANG, LU, ARBA, JOHN W., FREYDINA, EVGENIYA, GIFFORD, JOSEPH D., JHA, ANIL D., LIANG, LI-SHIANG
Publication of US20080067069A1 publication Critical patent/US20080067069A1/en
Assigned to SIEMENS WATER TECHNOLOGIES HOLDING CORP. reassignment SIEMENS WATER TECHNOLOGIES HOLDING CORP. MERGER (SEE DOCUMENT FOR DETAILS). Assignors: SIEMENS WATER TECHNOLOGIES CORP.
Assigned to SIEMENS INDUSTRY, INC. reassignment SIEMENS INDUSTRY, INC. MERGER (SEE DOCUMENT FOR DETAILS). Assignors: SIEMENS WATER TECHNOLOGIES HOLDING CORP.
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/469Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
    • C02F1/4693Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
    • C02F1/4695Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis electrodeionisation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D61/00Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis, ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/42Electrodialysis; Electro-osmosis Electro-ultrafiltration
    • B01D61/44Ion-selective electrodialysis
    • B01D61/46Apparatus therefor
    • B01D61/48Apparatus therefor having one or more compartments filled with ion-exchange material, e.g. electrodeionisation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D61/00Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis, ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/42Electrodialysis; Electro-osmosis Electro-ultrafiltration
    • B01D61/44Ion-selective electrodialysis
    • B01D61/46Apparatus therefor
    • B01D61/48Apparatus therefor having one or more compartments filled with ion-exchange material, e.g. electrodeionisation
    • B01D61/485Specific features relating to the ion-exchange material
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/4602Treatment of water, waste water, or sewage by electrochemical methods for prevention or elimination of deposits
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2313/00Details relating to membrane modules or apparatus
    • B01D2313/30Specific dilution or de-ionizing chambers
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00Apparatus for treatment of water, waste water or sewage
    • C02F2201/46Apparatus for electrochemical processes
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00Apparatus for treatment of water, waste water or sewage
    • C02F2201/46Apparatus for electrochemical processes
    • C02F2201/461Electrolysis apparatus
    • C02F2201/46105Details relating to the electrolytic devices
    • C02F2201/46115Electrolytic cell with membranes or diaphragms
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/22Eliminating or preventing deposits, scale removal, scale prevention

Abstract

An electrochemical treating device having low scale potential is disclosed. The device has a variety of configurations directed to the layering of the anionic exchange and cationic exchange. The treatment device can also comprise unevenly sized ion exchange resin beads and/or have at least one compartment that provides a dominating resistance that results in a uniform current distribution throughout the apparatus.

Description

    CROSS-REFERENCE TO RELATED APPLICATIONS
  • This application claims the benefit of U.S. Provisional Patent Application Ser. No. 60/805,505, filed on Jun. 22, 2006, titled “ENHANCED HARDNESS TOLERANCE OF CEDI MODULES” and U.S. Provisional Patent Application Ser. No. 60/805,510, also filed on Jun. 22, 2006, titled “METHODS TO REDUCE SCALING IN EDI DEVICES,” each of which is incorporated herein by reference.
  • BACKGROUND OF INVENTION
  • 1. Field of Invention
  • This invention relates to systems and methods of water treatment having a low potential for scale formation and, in particular, to reducing the potential for scale formation in systems that utilize electrically-motivated separation apparatus.
  • 2. Discussion of Related Art
  • Electrically-motivated separation apparatus including, but not limited to, electrodialysis as well as electrodeionization devices, have been used to treat water. For example, Liang et al., in U.S. Pat. No. 6,649,037, disclose an electrodeionization apparatus and method for purifying a fluid by removing the ionizable species.
  • SUMMARY OF THE INVENTION
  • One or more aspects of the invention relate to an electrodeionization apparatus having an anode compartment and a cathode compartment. The electrodeionization apparatus comprises a first depleting compartment disposed between the anode compartment and the cathode compartment, a concentrating compartment in ionic communication with the depleting compartment, a second depleting compartment in ionic communication with the concentrating compartment, and a first barrier cell in ionic communication with and disposed between the first depleting compartment and at least one of the anode compartment and the cathode compartment.
  • Other aspects of the invention relate to an electrodeionization apparatus comprising a depleting compartment and a first concentrating compartment in ionic communication with the depleting compartment, and defined at least partially by an anion selective membrane and a cation selective membrane. The first concentrating compartment typically contains, at least partially, a first zone comprising substantially of cation exchange media that is substantially separated from the anion selective membrane by a second zone comprising substantially of anion exchange media.
  • Still other aspects of the invention relate to an electrodeionization apparatus comprising a depleting compartment, a first concentrating compartment in ionic communication with the depleting compartment, and a second concentrating compartment in ionic communication with the depleting compartment. The first concentrating compartment typically comprises media with a first effective current resistance and the second concentrating compartment having a portion thereof comprising media with a second effective current resistance greater than the first effective current resistance.
  • Still other aspects of the invention relate to an electrodeionization apparatus comprising a depleting compartment, and a concentrating compartment in ionic communication with the depleting compartment. The concentrating compartment typically comprises a mixture of anion exchange resin and cation exchange resin and amounts of the anion exchange resin and cation exchange resin in the mixture varies relative to a flow path length of the concentrating compartment.
  • Still other aspects of the invention relate to an electrodeionization apparatus having at least one compartment with at least one outlet port defined by a distributor having a plurality of apertures. The electrodeionization apparatus can comprise a first layer of particles in the compartment bounded by ion selective membranes. The particles can comprise media having a first effective diameter less than the smallest dimension of the apertures. The electrodeionization apparatus further comprises a second layer of particles in the compartment downstream of the first layer. The second layer of particles typically has a second effective diameter greater than the first effective diameter and greater than the smallest dimension of the apertures.
  • Still further aspects of the invention relate to electrodeionization system comprising a source of water to be treated, a treating module comprising a depleting compartment and a concentrating compartment, the treating module fluidly connected to the source of water to be treated; an electrolytic module comprising an acid-generating compartment, and a source of a brine solution fluidly connected to an inlet of the acid-generating compartment of the electrolytic module. The electrolytic module is fluidly connected upstream of the concentrating compartment.
  • Aspects of the invention relate to an electrodeionization apparatus comprising a compartment containing a mixture of anion exchange resins and cation exchange resins. The anion exchange resins having an average diameter at least 1.3 times greater than an average diameter of the cation exchange resins.
  • Aspects of the invention relate to an electrodeionization apparatus comprising a compartment containing a mixture of anion exchange resins and cation exchange resins. The cation exchange resins having an average diameter at least 1.3 times greater than an average diameter of the anion exchange resins.
  • Still other aspects of the invention relate to a water treatment system comprising a source of water to be treated, an electrodeionization device comprising a plurality of concentrating and depleting compartments and fluidly connected to the source of water to be treated, a chiller in thermal communication with the water to be introduced into at least one concentrating compartment of the electrodeionization device, a sensor disposed to provide a representation of a temperature of at least one of water to be introduced into the concentrating compartment and water exiting the concentrating compartment, and a controller configured to receive the temperature representation and generate a signal that promotes cooling the water to be introduced into the concentrating compartment.
  • Still other aspects of the invention relate to electrodeionization apparatus comprising a depleting compartment at least partially defined by a cation selective membrane and an anion selective membrane, and a concentrating compartment at least partially defined by the anion selective membrane and containing a first layer of anion exchange media and a second layer of media disposed downstream of the first layer, the second layer comprising anion exchange media and cation exchange media.
  • Still other aspects of the invention relate to a method of treating water in an electrodeionization device having a depleting compartment and a concentrating compartment. The method comprising measuring one of a temperature of a stream in the concentrating compartment, a temperature of a stream to be introduced into the concentrating compartment, and a temperature of a stream exiting from the concentrating compartment; reducing the temperature of the water to be introduced into the concentrating compartment to a predetermined temperature; introducing water to be treated into the depleting compartment; and removing at least a portion of at least one undesirable species from the water to be treated in the electrodeionization device.
  • Still other aspects of the invention relate to a method of treating water in an electrodeionization device comprising introducing water having anionic and cationic species into a depleting compartment of the electrodeionization device, promoting transport of at least a portion of the cationic species into a first barrier cell disposed between the depleting compartment and a cathode compartment of the electrodeionization device, and promoting transport of at least a portion of the anionic species into a second barrier cell disposed between the depleting compartment and an anode compartment of the electrodeionization device.
  • Still other aspects of the invention relate to a method of treating water in an electrodeionization device having a depleting compartment and a concentrating compartment. The method comprises introducing water to be treated into the depleting compartment of the electrodeionization device, promoting transport of an undesirable species from the depleting compartment into the concentrating compartment of the electrodeionization device. The concentrating compartment can typically contains a first layer of anion exchange media and a second layer of media disposed downstream of the first layer and the second layer can comprise a mixture of anion exchange media and cation exchange media.
  • Still other aspects of the invention relate to a method of treating water comprising introducing water to be treated into a depleting compartment of an electrodeionization device, the depleting compartment having at least one layer of ion exchange media; and promoting transport of at least a portion of anionic species from the water introduced into the depleting compartment from a first layer of ion exchange media into a first concentrating compartment to produce water having a first intermediate quality. The first concentrating compartment is defined, at least partially, by an anion selective membrane and a cation selective membrane. The first concentrating compartment contains, at least partially, a first zone comprising cation exchange media that is substantially separated from the anion selective membrane by a second zone comprising anion exchange media.
  • Still other aspects of the invention relate to a method of treating water in an electrodeionization device. The method comprises introducing water to be treated comprising undesirable species into a depleting compartment of the electrodeionization device, promoting transport of the undesirable species from the depleting compartment to a concentrating compartment of the electrodeionization device to produce the treated water; electrolytically generating an acid solution in the ancillary module, and introducing at least a portion of the acid solution into the concentrating compartment.
  • Further aspects of the invention relate to a water treatment system comprising a source of a water to be treated, and an electrodeionization device comprising a first depleting compartment and a second depleting compartment, each of the first and second depleting compartment fluidly connected to the source of water to be treated in a parallel flow configuration; and a first concentrating compartment in ionic communication with the first depleting compartment and a second concentrating compartment fluidly connected to downstream of the first concentrating compartment.
  • Other aspects of the invention relate electrodeionization apparatus comprising a plurality of depleting compartments configured to have liquid flowing therein along parallel flow paths, and a plurality of concentrating compartments in ionic communication with at least one depleting compartment, wherein at least portion of the concentrating compartments are arranged serially.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures is represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing.
  • In the drawings:
  • FIG. 1 is a schematic illustration of a portion of an electrodeionization apparatus comprising at least one barrier cell in accordance with one or more embodiments of the invention;
  • FIG. 2 is a schematic illustration of a portion of an electrodeionization apparatus having layered beds of media in at least one concentrating compartment thereof in accordance with one or more embodiments of the invention;
  • FIG. 3 is a schematic illustration of a portion of an electrodeionization apparatus comprising at least one concentrating compartment having zones of media in accordance with one or more embodiments of the invention;
  • FIG. 4 is a schematic illustration of a portion of a treatment system in accordance with one or more embodiments of the invention;
  • FIG. 5 is a schematic illustration of a portion of an electrodeionization apparatus having at least one compartment modified to reduce the effective resistance or improve the current distribution in other compartments in accordance with one or more embodiments of the invention;
  • FIG. 6 is a schematic illustration of a portion of an electrodeionization apparatus having a increased effective flow velocity in at least one concentrating compartment thereof in accordance with one or more embodiments of the invention;
  • FIGS. 7A and 7B is a schematic illustration of a portion of an electrodeionization apparatus comprising a compartment containing resin beads of differing sizes in accordance with one or more embodiments of the invention; and
  • FIG. 8 is a graph showing the relationship between an Langelier Saturation Index value of a water stream relative to the temperature of the water stream;
  • FIGS. 9A and 9B are schematic illustrations of concentrating and depleting compartment cell pairs in an electrodeionization device wherein FIG. 9A shows compartments thereof comprising layers of media and FIG. 9B shows compartments thereof comprising layers and zones of media in accordance with one or more embodiments of the invention; and
  • FIG. 10 is a graph showing the performance of electrodeionization apparatus in accordance with one or more embodiments of the invention.
  • DETAILED DESCRIPTION
  • The invention provides electrically-driven separation apparatuses such as but not limited to filled compartment electrodeionization (CEDI) devices such as those disclosed in U.S. Pat. Nos. 4,632,745, 6,649,037, 6,824,662, and 7,083,733, each of which is incorporated herein by reference. In particular, the embodiments implementing one or more aspects of the invention provide can be, in some cases, characterized as having a lower potential or a lower likelihood of forming scale. Although the various aspects of the invention are presented through embodiments involving electrodeionization devices, such various aspects of the invention may be practiced in other electrically-driven or motivated separation apparatus that can facilitate treatment of a fluid having at least one undesirable species. Particularly pertinent aspects of the invention can involve electrodeionization apparatus utilized to treat or remove at least one dissolved species from a water stream or a body of water. Thus, the various aspects of the invention can advantageously provide electrodeionization apparatuses that are configured or operated to treat water having high scale potential.
  • An aspect of the invention can be implemented in the exemplary embodiment presented in FIG. 1 which schematically shows a portion of an electrodeionization apparatus 100. The electrodeionization apparatus typically comprises at least one concentrating compartment 112 and at least one depleting compartment 114, which constitute a cell pair 115, and disposed in ionic communication with each other and, preferably, between and with an anode compartment 120 and a cathode compartment 122. In an advantageous embodiment of the invention, the electrodeionization apparatus can further comprise at least one barrier cell 130 that can trap migrating species. For example, the electrodeionization apparatus 100 can have barrier or neutral cells 130 and 132 disposed adjacent anode compartment 120 and cathode compartment 122. Barrier cells typically provide a buffer for an electrode compartment to separate or prevent species from forming localized scale. Electrodeionization apparatus typically generate hydroxide ions which can raise the pH at localized regions, especially at the points or surfaces conducive to electrolytic reactions. Such localized regions, or even at the electrode compartments, typically have pH conditions much greater than the bulk of the liquid. Because the barrier cells can serve to isolate such high pH regions from scale-forming species transported from the one or more depleting compartments during treatment of the water, thereby inhibiting or at least reducing the potential for scale formation. As exemplarily illustrated in FIG. 1, electrodeionization apparatus 100 can comprise barrier cell 130 that ionically isolates at least one precipitatable component, such as Ca2+, from a component, such as OH, that contributes to scale formation. Typically, one or more of barrier cells 130 can be defined, at least partially, by an anion selective membrane 140A that permits migration of anionic species such as OH while inhibiting the further migration of cationic species into an adjacent compartment. As illustrated, a barrier cell 130 can be disposed adjacent concentrating compartment 112. One or more such barrier cells can also further be partially defined by a cation selective membrane 140C. In this manner, for example, a component of a precipitatable compound, such as Ca2+, can be inhibited from being introduced into a compartment having localized regions of high pH, such as electrode compartment 120, that typically result from hydroxide species generation.
  • Other embodiments of the invention can involve barrier cells that separate neutral or weakly ionized, or at least ionizable, species, such as, but not limited to silica, SiO2. Silica can precipitate from the bulk liquid if the concentration is high enough or where a pH change occurs, such as change from a high pH to a neutral pH. In electrodeionization apparatus, silica is typically removed while in its ionized state, at high pH. One or more barrier cells 132 can be disposed to ionically isolate an anode compartment 122 of electrodeionization apparatus 100, wherein hydrogen ions are generated and consequently can have low or neutral pH liquid flowing therein. After silica migrates from depleting compartment 114 into concentrating compartment 112 through anion selective membrane 140A, it is trapped by barrier cell 132 containing high pH liquid flowing therein and inhibited from further migration into the low or neutral pH compartment with neutral or near neutral pH, and thereby reduce the likelihood of polymerizing into silica scale. Cell 132, like cell 130, can be defined, at least partially, by cation selective membrane 140C and anion selective membrane 140A. Barrier cell 132 can thus serve to trap pH-precipitatable species and prevent or at least inhibit precipitation of such species. Barrier cell 132 can also contain, at least partially, anion exchange media and cation exchange media or a mixture of both. Further, one or more of the barrier cells can further comprise inert media or other filler material that can facilitate assembly of the electrodeionization apparatus or provide a desirable characteristic such as resistance or flow distribution during, for example, operation of the apparatus. Likewise, one or more of the concentrating compartments, the depleting compartments, and the electrode compartments can contain, at least partially, a mixture of anion and cation exchange media. Indeed, a mixture of anion and cation exchange media in the concentrating compartments and electrode compartments can further reduce scaling potential by facilitating transport of precipitatable species away from the selective membranes which avoids accumulation of an ionic species that may occur in compartments or regions of compartments with a single type of active exchange media.
  • In some embodiments of the invention, the anode compartment can contain, at least partially, media that is substantially comprised of oxidation resistant substrate. Thus, for example, durable, highly cross linked ion exchange resin, such as commercially available cation resins, can be used in the anode compartment in which an oxidizing environment may be present. Further, cation exchange resin when utilized in the anode compartment can prevent or inhibit transport of chloride ions to the anode surface where such species may be converted to oxidizing chlorine.
  • The apparatus of the invention can treat water having hardness of greater than 1 mg/L as CaCO3 or silica content of greater than 1 mg/L, or both. Thus, the apparatus and techniques of the invention are not confined to conventional operating limits and, when used in a treatment system, can obviate at least one unit operation intended to soften the water to be treated or remove silica. This advantageously can reduce capital and operating costs while improving the treatment system's reliability and availability as well as capacity. For example, the treatment systems of the invention, comprising one or more electrodeionization devices described herein, can treat water without a two-pass reverse osmosis (RO) subsystem, while providing water having the same or comparable quality as a system that utilizes a two-pass RO device to remove or reduce the concentration of hardness causing components and silica before an electrodeionization device.
  • Further aspects of the invention can involve electrodeionization apparatus comprising at least one depleting compartment and/or at least one concentrating compartment having layered media contained therein. For example, one or more depleting compartments 112 of electrodeionization device 100 can comprise a first layer of particles 112A, at least a portion thereof comprising active media that facilitates transport or migration of a first target, typically ionized, species. Depleting compartment 112 can further comprise a second layer 112B comprising, at least partially, active media that facilitates transport of the first target species and a second target species, or both. First layer 112A can comprise particles having a first effective diameter and second layer 112B can have particles with a second effective diameter. Further embodiments can involve a third layer 112C in depleting compartment 112. Third layer 112C can have active or inert media, or a mixture of both, with a third effective diameter. The effective diameter can be a smallest dimension of a particle. Alternatively, the effective diameter can be an average diameter of the collective particles and is a calculated diameter of an analogous sphere of comparable volume and surface area. For example, the effective diameter of particles in a layer can be a function of the ratio of the volume of a particle to the surface area of a particle or an average of the smallest dimension of the particles. In a preferred configuration, the particles in a downstream layer have an effective diameter that is less than the effective diameter of particles in an upstream layer. For example, particles comprising layer 112C can be spherical particles with a larger effective diameter than the effective diameter of particles comprising layer 112B. Optionally, the effective diameter of the particles comprising layer 112A can be greater than the effective diameter of particles in layer 112B or 112C. One or more of the concentrating compartments may be similarly layered.
  • In a preferred embodiment, the particles in an upstream layer have an effective diameter that is at least the dimension of interstices between the particles of a downstream layer. In further embodiments, the upstream particles have an effective diameter or a smallest dimension that is less than the smallest dimension of the apertures of distributor 160 that defines an outlet port of depleting compartment 112. Distributor 160 can be a screen that serves to retain the media within the compartments. Thus, each of the depleting compartments and concentrating compartments containing media can have at least one distributor that permits fluid flow therethrough while retaining the media and a layer of media that are sized to retain particles in an upstream layer.
  • The apertures or openings of distributors are typically designed to retain resins having a diameter of about 500 μm to about 700 μm. Utilizing the configuration of the invention, anion and cation exchange resins may be utilized having smaller dimensions than the aperture dimensions which improves mass transfer kinetics throughout the apparatus. Further, smaller ion exchange resins can improve packing within the compartment and reduces the likelihood of channeling or flow bypass along the compartment walls. Close packed spheres or nearly spherical particles have interstitial spaces of about 0.414 times the radius of the spheres. Thus, the effective diameter of the upstream resin is preferably not less than such dimension. For example, the fine mesh resin beads having an effective diameter of about 62 μm to about 83 μm may be utilized in an upstream layer with a layer of resin beads having a diameter of about 300 μm to about 400 μm. Any of the layers may comprise any suitable fraction of the compartment. The depth of the upstream layer may be dependent on providing a desired performance. Further, advantageous configurations contemplate the use of cation resin beads having a smaller effective diameter or dimension with larger anion resin beads to facilitate cation migration activity. Notable arrangements are not limited to the use of active resin as the lower, downstream media and the invention may be implemented utilizing inert media in one or more of the downstream layers.
  • The interfaces between the layers may constitute a gradient of small and large resin beads. Thus, the boundary between layers need not be particularly delineated. Other configurations, moreover, can involve a mixture of the fine mesh resin beads mixed with larger resins.
  • Another aspect of the invention can involve electrodeionization apparatus comprising at least one concentrating compartment having layered media contained therein. As illustrated in FIG. 2, the electrodeionization device 200 can have at least one concentrating compartment 214 and at least one depleting compartment 212. At least one of the concentrating compartments 214 can have a first layer 215 and a second layer 216. In electrodeionization devices that treat relatively pure water, such as RO permeate, the current efficiency is typically below 100% because, it is believed, of water splitting and transport of the generated hydrogen and hydroxyl ions. This can create local pH fluctuations and can promote scale formation especially where the hydroxyl species reacts with bicarbonate species or carbon dioxide to form carbonate ions which forms calcium carbonate scale.
  • For example, in a typical electrodeionization apparatus, bicarbonate ions transfer through the anion exchange membrane near the inlet of the compartment but may be inhibited from migrating further from the membrane. When water splitting takes occurs, the hydroxyl species transported through the anion exchange membrane can react with the bicarbonate species to form carbonate which then reacts with calcium to form calcium carbonate scale.
  • By utilizing layers in one or more of the concentrating compartments, target species can be directed to locations where they are less likely to form scale. As shown in FIG. 2, a layer 215 of anion exchange media can be disposed around the inlet of concentrating compartment 214 to promote migration of bicarbonate species. After the bicarbonate species is transported through the anion exchange membrane 240A, it is promoted through the anion resin of layer 215 and moves towards the cation selective membrane 240C. Even though there are hardness ions passing through cation selective membrane 240C, the pH of the fluid is relatively low around this membrane, which reduces the likelihood of forming carbonate.
  • The depleting compartments 212 and the other one or more layers 216 of the concentrating compartments 214 may contain mixed anion exchange and cation exchange media.
  • To further reduce or inhibit scale formation, layers of media can be disposed along a flow path length of the concentrating compartment. As shown in FIG. 3, one or more concentrating cells may comprise, at least partially, a first zone 314A of ion exchange media and a second zone 314B of ion exchange media. The first and second zones may be linearly distributed along the length of the compartment as represented by boundary 350 or may be a gradient of increasing or decreasing amounts of types of ion exchange media in zones 315C and 315D and delineated by gradient boundary 351. The first or second zones may comprise, consist essentially of, or consist of anion exchange media, or cation exchange media. For example, zone 314A can comprise cation exchange media that substantially segregates zone 314B, which comprises anion exchange media, from cation selective membrane 340C. Substantially separating refers to, in some cases, being disposed between a zone and a membrane such that a separating zone comprises or consists essentially of a type of media, which can be anionic, cationic, or inert.
  • In some cases, the first zone or second zone can be a mixture of differing amounts of types of ion exchange media. For example, zone 315C can comprise, consists essentially of, or consist of cation exchange media adjacent cation selective membrane 340C and zone 315D can comprise, consist essentially of, or consist of anion exchange media, wherein the amount of anion exchange media, relative to the amount of cation exchange media increases, or decreases, along the flow path length or lengthwise dimension, such that a boundary between zones which is defined by gradient boundary 351. In another embodiment, a third zone (not shown) of media can be disposed between the first and second zones. The third zone can comprise, consists essentially of, or consist of inert media, cation exchange media, anion exchange media, mixed media, or mixtures thereof. Further, one or more screens can be used between zones or within the zones to facilitate filling the compartments of the apparatus, which, during operation can also improve flow distribution and further inhibit scale formation. Assembly and filling can also be facilitated by utilizing a binder to secure the media of each zone. For example, media of the first zone can be mixed with a water soluble binder, such as starch. The mixture can then be placed into the compartment. A second mixture of media of the second zone can be similarly prepared and disposed in the compartment.
  • Zone 314B facilitates transport of anionic species, such as bicarbonate ions, away from anion selective membrane 340A and zone 315C facilitates transport of cationic species, such as calcium ions, away from anion selective membrane 340C. Such segregating zones thus reduce the likelihood of scale formation around membrane surfaces.
  • As illustrated in FIG. 3, depleting compartment can comprise a first layer 312A of media, a second layer 312B of media, and, optionally, a third layer 312C of media. The first layer can comprise a mixture of anion exchange media, cation exchange media, or inert media. The second layer can comprise, consist essentially of, or consist of anion exchange media or inert media or a mixture thereof. The third layer can comprise, consist essentially of, or consist of anion exchange media, cation exchange media, inert media, or a mixture thereof.
  • Further aspects of the invention involve systems and techniques that modify the pH of a stream flowing in at least one concentrating compartment of an electrodeionization apparatus. The pH of the stream can be reduced to reduce the likelihood of scale formation by generating and adding an acidic solution to one or more of the concentrate and electrode compartments. The acidic solution can be generated or prepared by utilizing an electrolytic module. Further scale inhibition or tolerance can be effected by degasification of the concentrate liquid. Any acid generating module may be utilized such as those commercially available from Dionex Corporation, Sunnyvale, Calif.
  • Typically, an electrodeionization device can treat liquids having low hardness. This limitation limits the incoming feed water into electrodeionization devices to a hardness level of 1 ppm or less, as calcium carbonate. To treat water having a hardness value greater than 1 ppm, pretreatment processes such as two-pass RO or a softener post RO, must be used. The additional pretreatment unit operations increase system complexity and cost as well as waste. The electrodeionization devices of the present invention, however, can reliably treat water having higher hardness thereby eliminating or reducing the dependence on such pretreatment operations.
  • Addition of an acidic solution into the concentrating compartment of electrodialysis devices to reduce calcium precipitation is known; however adding acidic solutions to electrodeionization devices is not practiced because of low flow velocity of the streams in the concentrate compartments, especially in thick cell compartment. Further, a high quantity of acid is typically required. As illustrated in FIG. 4, the treatment system 400 of the invention can comprise an electrochemical device 435 to produce an acid solution to be introduced into a compartment, typically concentrating compartment 414 of an electrodeionization device 445 disposed to receive water to be treated from source 411. A portion of treated product water from electrodeionization device 445 can be used to facilitate generating the acid solution in an acid-generating compartment 472 of electrochemical device 435. At least a portion of the treated water can be delivered to a point of use 413. A source 462 of a brine solution comprising a salt from, for example, softener brine tank may be introduced into electrolytic module 435 to promote acid solution production. Electrochemical device 435 may be portion of electrodeionization device 445. The brine solution typically comprises sodium chloride.
  • In some cases, the acidic solution can be introduced into one or more of the depleting and concentrating compartments 412 and 414, as well as the electrode compartments of electrodeionization device 445. Preferably, acidic solution is added in an amount to provide a pH of the exiting stream solution leaving the compartment of between about 2.5 to 4.3 units. Further embodiments may involve neutralizing one or more streams from electrodeionization device 445. For example a basic solution produced from compartment 472 of electrolytic module 435 may be combined to neutralize an outlet stream, typically having a low pH, from concentrating compartment 414 before being discharged to drain 463 or the environment.
  • Degasification of the concentrate stream to remove carbon dioxide may further reduce or eliminate the precipitation potential in the concentrating compartment. Degasification can be accomplished by the addition of a degasification device or by membrane processes or other methods. Degasification may be relevant when utilizing an acidic solution in the concentrating compartment because of the potential formation of carbon dioxide gas, which can diffuse back through the membrane and reduce product quality. Further, the flow of the stream within the compartment may be countercurrent to facilitate gas removal.
  • Recirculation of the concentrate compartment using a pump and, optionally, a tank can further enhance the scale inhibition by the acidification and degasification techniques described herein.
  • The components, arrangements, and techniques of the invention also provide improved current distribution in an electrodeionization device. As schematically illustrated in FIG. 5, the current resistance through the electrodeionization apparatus 500 between electrodes 520 and 522 can be characterized by a series of compartment resistances 573, 575, and 577, which are representative of the depleting and concentrating compartments 512 and 514, and by membrane resistances 584, 586, and 588, which are representative of anion selective membranes 540A and cation selective membranes 540B. Improved current distribution throughout electrodeionization apparatus 500 can be effected by utilizing at least one concentrating compartment 516 with at least a portion thereof having an effective current resistance 580 that is greater than the effective current resistance of the other compartments, such as the concentrating compartments.
  • The effective current resistance of a compartment or portion thereof may be modified by mixing inert resin beads, or low or non-conducting materials, with in the concentrating compartment. Selectively increasing the effective current resistance effects a more uniform current distribution through the other compartments. The reduced variations in current throughout the depleting compartments, for example, improve overall performance.
  • In an electrodeionization device, the electrical resistance may depend on the types of media in the device as well as the active chemical form of those media, i.e., what ions are moving through the media. In a layered bed compartments, the resistance typically vary between the layers because of the different types of resin and the form of the resins. Typically, the strongly charged species or ions are motivated and the water splitting phenomena and weakly ion promotion follow. Thus, media resins near the inlet of the compartment would exchange with the target species in the feed water while media near the outlet would be mostly in the hydrogen and hydroxide forms. Typically, most of the strongly charged ions must be removed, which may not be effected if the feed concentration and/or flow are high enough or if the current is low enough.
  • If the resistance in the compartments can vary between layers thereof or along the length of the bed, then the current density can also vary accordingly. However, the resistance through the entire module may not just be a function of the resistances of the depleting compartments. The depleting compartments are electrically in series with the membranes and the concentrating compartments and electrode compartments, which may or may not also vary in resistance along their length. If the resistances of the depleting compartments are a small portion of the total resistance through the module, then even if such resistances vary significantly, the overall resistance will be dominated by other factors and current distribution will be more uniform. However, if the depleting compartment resistances are high relative to the other resistances, the current distribution will be affected by resistance differences within the depleting compartments.
  • Typical electrodeionization devices incorporate screen filled concentrating and/or electrode compartments. In these configurations, the resistance of the water in these compartments is much greater than the resistance of the resin in the depleting compartments in most cases, and therefore, current distribution is not generally controlled by the resistances of the depleting compartments. Filling the concentrating and electrode compartments with resin as well as using lower resistance ion exchange membranes reduces the overall module resistance significantly. However, in certain circumstances this can lead to uneven current distribution as the module resistances become dominated by the resistances of the depleting compartments.
  • In some embodiments of the invention, therefore, screen filled concentrating and electrode compartments may minimize uneven current distribution. However, in most post RO applications, the water has very low conductivity leading to high module resistance. This high resistance further creates limitations if there are electrical potential constraints. The invention, in contrast, provides comparable performance without using brine injection into the stream flowing into the concentrating compartment thereby reducing operating cost and process complexity.
  • As noted, mixing inert resin in one or more concentrating and/or electrode compartment as fillers can increase the resistance in those compartments which improves current distribution through the module. As shown in FIG. 5, one or more concentrating compartment 516 can comprise inert resin to provide higher effective resistance 580 therethrough which dominates the collective resistances of other compartments and membranes. Because the dominant resistance controls the overall resistivity, the effective current distribution through the other compartments becomes more uniform. The amount of inert resin can be varied to increase the effective resistance and modify the current distribution through the apparatus. Inert resin can also be used in layers in one or more concentrating and electrode compartments to locally increase the resistance in certain portions where the dilute resistance is determined to be low. Thus, as shown in FIG. 5, current distribution through zone 512 can be matched or made comparable to the current through zone 511 of the apparatus by utilizing a higher resistivity layer in compartment 515 such that the effective resistance 573 of the layer of compartment 515 is increased. The amount of resistance can be effected empirically measuring the effective resistance relative to the amount of inert resin utilized.
  • Other materials with low conductivity, such as polymeric screens or fiber material can be used to increase the resistance along with the inert resin beads.
  • Electrodeionization apparatus may be limited to a maximum recovery of 90-95% to prevent scale formation of limited solubility species in the feed water such as hardness and silica. If the feed water contains very low amounts of these species the device should be able to operate at higher recovery rates. Some aspects of the invention involve electrodeionization apparatus having multiple passes through concentrating compartments thereof thereby providing recovery rates. The multiple pass configurations facilitate maintaining a predetermined velocity without a recirculation pump and loop. However, this invention is may be preferably utilized in applications with recirculating loops wherein the feed water ion concentration is low and a very high recovery is desired to avoid wasting or discharging high purity water and/or increasing operating time of the makeup system. In some embodiments of the electrodeionization apparatus of the invention, the fluid flow rate is sufficient to reduce the likelihood of creating dead volumes, channeling and localized overheating within the compartments. For example, the desired fluid flow rate in a compartment can be at least about 2 gallons per minute per square foot in a concentrating compartment. Other fluid flow rates may be dictated by other factors including, but not limited to, the concentration of a component of the precipitating compound, the temperature of the fluid, and the pH of the fluid. Lower velocities may induce channeling.
  • FIG. 6 schematically illustrates a portion of an electrodeionization apparatus 600 comprising depleting compartments 614 and concentrating compartments 612 between electrode compartments 630 and 632. The arrangement and configuration provide one depleting compartment pass with an associated plurality of concentrating compartment passes in the treatment apparatus and systems of the invention. Such configurations allow for an increased fluid flow velocity in the concentrating compartments, preferably up to five times greater than the flow rate of a single pass device. As shown in FIG. 6, water from source 615 is sequentially introduced into concentrating compartments 612 and directed into downstream concentrating compartments 612B and then to compartments 612C and to drain or to downstream unit operation 625.
  • Water to be treated is introduced into depleting compartments 614 and directed to point of use without following or tracking the flow of water through compartments 612, 612A, and 612B. The invention, however, is not limited to the number of associated concentrating compartment volumes relative to the number of depleting compartment volumes and any ratio of concentrating compartments to depleting compartments can be used to provide a desired high fluid flow rate through the compartments.
  • Different size cation and anion exchange resin beads in the mixed layers or compartment may be utilized to further reduce the transport rate of the larger bead counter-ions and facilitate transport of the smaller bead counter-ions.
  • Ion transport typically occurs through the ion exchange resins. Successful transport may thus depend on a complete path of like material between the beads and the membranes. A cationic species typically diffuses onto a cation resin bead and will tend to move toward the cathode following a path of cationic media until it reaches the cation selective membrane and passes through into the concentrating compartment. If the path is broken, the cationic species will have to diffuse out of the last bead and into the bulk solution, therefore reducing the chance it will be picked up later in the bed and increasing the chance it will end up in the product water. The path can be broken by poor packing such that the beads don't have good contact or it can be broken by a bead of the opposite charge.
  • Using a relatively thin cell or tightly packing the resins can increase the probability of maintaining the desired pathway. Utilizing cation and anion exchange resin of a similar and relatively uniform size will also increase the likelihood of maintaining the desired pathway. Using cation and anion exchange resin of different sizes, however, can block transfer.
  • In some cases, it may be advantageous to inhibit transport of either cations or anions. By selectively reducing the size of one type of resin in a mixed bed, the transfer of the smaller bead counter-ions will be enhanced due to more complete paths whereas the transfer of the larger bead counter-ions will be retarded due to fewer complete paths because as the size of the smaller beads approaches some fraction of the size of the larger beads, smaller resin beads tend to pack around the larger beads, which isolates and breaks the path from one large bead to the next. This phenomenon may also depend on the relative ratio of the large and small ion exchange resin beads. For example a mix of 50% small beads by volume would affect the transport of ions much differently than a mix of 25% or 75% small beads by volume.
  • Once the size and mix ratios of the media are appropriately selected to slow transport of a target or selected type of ion and increase transport of different type, hydrogen or hydroxyl ions must be transferred to maintain electro neutrality. For example, if a bed consisting essentially of cation resin is used in a depleting compartment as shown in FIG. 7A, cationic species would migrate through the cation exchange resin beads 731 and the cation membrane 740C into an adjacent concentrating compartment. Water would split at site 766 of the anion selective membrane 740A which creates a hydrogen ion that replaces the migrating cation in the depleting compartment and a hydroxyl ion which migrates into an adjacent concentrating compartment which neutralizes the cationic species migrating from another depleting compartment (not shown). This phenomenon relies on the ability to split water on the surface of the anion membrane where there is relatively little contact area between the anion membrane and cation beads. Utilizing smaller cationic exchange resin beads 733 with larger anionic exchange resin beads 734, as illustrated in FIG. 7B, reduces the transport rate of anionic species. Further, the use of differing resin bead sizes provides additional water splitting sites 766 at the tangents between the cation exchange resin 733 and anion exchange resins beads 734, which in turn improves performance by reducing the resistance across the module.
  • For example, an electrodeionization apparatus of the invention can comprise a compartment containing a mixture of anion exchange resins and cation exchange resins, the cation exchange resins having an average diameter at least 1.3 times greater than an average diameter of the anion exchange resins. Alternatively or in addition, the electrodeionization apparatus can comprise a compartment containing a mixture of anion exchange resins and cation exchange resins, the cation exchange resins having an average diameter at least 1.3 times greater than an average diameter of the anion exchange resins.
  • EXAMPLES
  • The function and advantages of these and other embodiments of the invention can be further understood from the examples below, which illustrate the benefits and/or advantages of the one or more systems and techniques of the invention but do not exemplify the full scope of the invention.
  • Example 1
  • This example describes the effect of temperature on the Langelier Saturation Index (LSI).
  • Calculating an LSI value is known in the art for a measure of the potential for scale formation. LSI is a function of pH, total dissolved solids (TDS), temperature, total hardness (TH), and alkalinity. Using the following estimates for these parameters for a concentrating compartment stream of an electrodeionization apparatus, the temperature of the stream relative to the LSI value can be defined and a representative relationship is shown in FIG. 8, based on a stream with a pH of 9.5 units, TDS of 30 ppm, TH of 15 ppm, as CaCO3, and an alkalinity of about 25 ppm, as CaCO3.
  • When the LSI value of a stream, is positive scaling is likely to occur. To inhibit scaling, the LSI value of the stream is reduced to, preferably a negative quantity. FIG. 8 shows that as the temperature is reduced the LSI value is reduced to below zero around 12.5° C. Thus, for the conditions described above, cooling the stream into the concentrating compartment of an electrodeionization device to below 12.5° C. should reduce the likelihood or prevent the formation of scale.
  • Cooling can be effected by thermally coupling a heat exchanger, or chiller, upstream of the electrodeionization apparatus. Other components and subsystems that facilitate removing thermal energy from the one or more streams into the apparatus may be utilized. For example, one or more sensors and controllers may be utilized to define a temperature control loop and facilitate maintaining the temperature of the stream to a target temperature or even to reduce the effective LSI value to a desired or target amount.
  • The target temperature can be determined empirically, by defining a temperature of the stream to be introduced into a concentrating compartment of the electrodeionization device, or be calculated based at least partially on the calculated LSI value. For example, an empirically established target temperature can be a temperature at which no scaling is historically observed with or without an additional margin to ensure that the scaling is further inhibited. An LSI-based target temperature may be defined based on a derived LSI-temperature relationship then calculating the target temperature associated with a set reduction in LSI value.
  • Example 2
  • In this example, the effect of resin bead size on the performance of an electrodeionization apparatus in accordance with one or more aspects of the invention was studied.
  • In one test, an electrodeionization module was constructed using an equal mixture of anion resin with an average bead diameter of 575 μm and a cation resin with an average bead diameter of 350 μm in the depleting compartments. Both of these resins were uniform particle size according to industry standards.
  • The module was fed a water that was previously treated by reverse osmosis and contained about 0.5 ppm Mg and 1.5 ppm Ca (both as CaCO3) with a pH of about 6.1. The module was operated at almost 100% current efficiency and product quality was about 1-2 MΩ-cm without almost zero silica removal.
  • The product water hardness level was below detection as measured by a Hach spectrophotometer (<10 ppb) and the pH was reduced to about 5.7. This indicates that the module was preferentially removing cations over anions.
  • Example 3
  • In this example, the effect on the performance of an electrodeionization apparatus with several layers of different bead sizes in compartments thereof in accordance with one or more aspects of the invention, was studied.
  • A module was constructed with three layers of ion exchange resin in the depleting compartments. The first and last layers consisted of an even mix of cation and anion resin of uniform particle diameters approximately 600 μm. The middle layer consisted of an even mix of cation exchange and anion exchange resins with particle diameters of 150-300 μm. The module spacer had slots in the flow distributor, which are used to hold resins in place, with a width of 254 μm. The module was operated for several months with no change in pressure drop, which indicates that the resins in the middle layer, of which some were smaller than the spacer apertures, did not pass through the bottom layer of resin and exit the module.
  • In addition, the addition of the middle layer of smaller resins improved the performance of a comparable electrodeionization device, control module. The module was operated in parallel with another electrodeionization module having compartments containing an even mix of cation exchange and anion exchange resins with particle diameters of about 600 μm. With a feed water previously treated by reverse osmosis having a conductivity of about 30 μS/cm and containing 3.75 ppm of CO2, the module comprising a layer of smaller ion exchange resins produced water having a resistivity of 16.4 MΩ-cm whereas the other typical module, without a layer of smaller ion exchange resins, produced water having a resistivity of 13.5 MΩ-cm. Further, the module comprising the layer of smaller exchange resins showed a silica removal of 96.6% versus 93.2% for the control module.
  • Example 4
  • In this example, the effect on the performance of an electrodeionization apparatus with several or multiple passes through concentrating compartments thereof was studied.
  • An electrodeionization module was assembled with four depleting compartments, three concentrating compartments, and two electrode compartments.
  • All of the depleting compartments were fed a water to be treated in to parallel to each other.
  • The concentrating compartment and electrode compartments were fed in series so that the stream introduced into the concentrating compartments entered the cathode compartment first, then flowed sequentially through the concentrating compartments and finally through the anode compartment. This contrasts with the conventional configuration in which a water stream is typically fed into the electrode compartments in parallel with a water stream into the concentrating compartments. The module thus had five effective concentrating compartment passes.
  • Data for this module (labeled as “Series Concentrate”) along with performance data for a standard module operating with parallel flows (labeled as “Parallel Concentrate”) is listed in Table 1 below. The data show that by serially arranging the stream to flow through the concentrating and electrode compartments, a fluid flow velocity similar to that when operating in parallel at a much lower reject flow rate. Therefore very high recoveries can be obtained while maintaining a minimum velocity in the concentrate. TABLE 1 Comparison of module with single pass concentrate versus module with five passes. Module Parallel Concentrate Series Concentrate Feed, μS/cm 30.3 30.3 Electrical resistance, Ohms 4.3 4.2 Product quality, MΩ-cm 3.1 3.6 Product flow, gpm 2.25 2.25 Concentrate flow, gph 7.2 1.2 Recovery, % 94.9 99.1 Concentrate velocity, gpm/ft2 2.0 1.7
  • Example 5
  • In this example, the effect on the performance of an electrodeionization apparatus with horizontal and vertical layers in the concentrating compartment was studied.
  • Two modules were assembled with different layering configurations as shown in FIGS. 9A and 9B. Each module was comprised of four of the respectively illustrated repeating cell pairs. In the figures, “MB” refers to a mixture or resins; “A” and “C” refer to zones or layers comprising anion exchange resin and cation exchange resin, respectively; and “AEM” and “CEM” refer to the anion selective membrane and cation selective membrane. The modules were operated for two and three weeks respectively with feed water having a conductivity of about 10 μS/cm and containing 2 ppm total hardness, as calcium carbonate.
  • After this period they were opened and no scale was observed. In contrast, a non-layered module containing mixed bed resin in the depleting and concentrating compartments showed scale on the anion membranes in the concentrate after two weeks of operation on the same feed water.
  • Example 6
  • In this example, the effect on the performance of an electrodeionization apparatus with vertical layers in compartments thereof along with addition of an acidic solution, was studied.
  • Three modules were assembled with horizontal layering in the depleting compartment and vertically oriented zones or layers, along the flow path length, in the concentrating compartments. Barrier cells were also disposed adjacent both electrode compartments. The modules were operated for ninety days with post-RO feed water containing about 2 ppm of total hardness. An acidic solution was injected into the concentrating compartments at rate that provide a pH of the water stream exiting the concentrating compartments of about 2.5-3.5.
  • FIG. 10 shows stable performance over the entire ninety days. In the figure, “FCE” refers to feed conductivity equivalent, which is calculated by adding the actual feed conductivity, in μS/cm, to the feed carbon dioxide, in ppm, times 2.67 and the feed silica, in ppm times, 1.94; and “Feed TH” refers to feed total hardness.
  • The controller of the system of the invention may be implemented using one or more computer systems. The computer system may be, for example, a general-purpose computer such as those based on an Intel PENTIUM®-type processor, a Motorola PowerPC® processor, a Sun UltraSPARC® processor, a Hewlett-Packard PA-RISC® processor, or any other type of processor or combinations thereof. Alternatively, the computer system may include specially-programmed, special-purpose hardware, for example, an application-specific integrated circuit (ASIC) or controllers intended for analytical systems.
  • The computer system can include one or more processors typically connected to one or more memory devices, which can comprise, for example, any one or more of a disk drive memory, a flash memory device, a RAM memory device, or other device for storing data. The memory is typically used for storing programs and data during operation of the treatment system and/or computer system. Software, including programming code that implements embodiments of the invention, can be stored on a computer readable and/or writeable nonvolatile recording medium, and then typically copied into memory wherein it can then be executed by the processor. Components of the computer system may be coupled by an interconnection mechanism, which may include one or more busses (e.g., between components that are integrated within a same device) and/or a network (e.g., between components that reside on separate discrete devices). The interconnection mechanism typically enables communications (e.g., data, instructions) to be exchanged between components of the computer system. The computer system can also include one or more input devices, for example, a keyboard, mouse, trackball, microphone, touch screen, and one or more output devices, for example, a printing device, display screen, or speaker. In addition, the computer system may contain one or more interfaces that can connect the computer system to a communication network (in addition or as an alternative to the network that may be formed by one or more of the components of the computer system).
  • According to one or more embodiments of the invention, the one or more input devices may include sensors for measuring parameters. Alternatively, the sensors, the metering valves and/or pumps, or all of these components may be connected to a communication network that is operatively coupled to the computer system. The controller can include one or more computer storage media such as readable and/or writeable nonvolatile recording medium in which signals can be stored that define a program to be executed by one or more processors. Storage medium may, for example, be a disk or flash memory. Although the computer system may be one type of computer system upon which various aspects of the invention may be practiced, it should be appreciated that the invention is not limited to being implemented in software, or on the computer system as exemplarily shown. Indeed, rather than implemented on, for example, a general purpose computer system, the controller, or components or subsections thereof, may alternatively be implemented as a dedicated system or as a dedicated programmable logic controller (PLC) or in a distributed control system. Further, it should be appreciated that one or more features or aspects of the invention may be implemented in software, hardware or firmware, or any combination thereof. For example, one or more segments of an algorithm executable by the controller can be performed in separate computers, which in turn, can be communication through one or more networks.
  • Those skilled in the art should appreciate that the parameters and configurations described herein are exemplary and that actual parameters and/or configurations will depend on the specific application in which the systems and techniques of the invention are used. Those skilled in the art should also recognize or be able to ascertain, using no more than routine experimentation, equivalents to the specific embodiments of the invention. It is therefore to be understood that the embodiments described herein are presented by way of example only and that, within the scope of the appended claims and equivalents thereto; the invention may be practiced otherwise than as specifically described.
  • Moreover, it should also be appreciated that the invention is directed to each feature, system, subsystem, or technique described herein and any combination of two or more features, systems, subsystems, or techniques described herein and any combination of two or more features, systems, subsystems, and/or methods, if such features, systems, subsystems, and techniques are not mutually inconsistent, is considered to be within the scope of the invention as embodied in the claims. Further, acts, elements, and features discussed only in connection with one embodiment are not intended to be excluded from a similar role in other embodiments.
  • As used herein, the term “plurality” refers to two or more items or components. The terms “comprising,” “including,” “carrying,” “having,” “containing,” and “involving,” whether in the written description or the claims and the like, are open-ended terms, i.e., to mean “including but not limited to.” Thus, the use of such terms is meant to encompass the items listed thereafter, and equivalents thereof, as well as additional items. Only the transitional phrases “consisting of” and “consisting essentially of,” are closed or semi-closed transitional phrases, respectively, with respect to the claims. Use of ordinal terms such as “first,” “second,” “third,” and the like in the claims to modify a claim element does not by itself connote any priority, precedence, or order of one claim element over another or the temporal order in which acts of a method are performed, but are used merely as labels to distinguish one claim element having a certain name from another element having a same name (but for use of the ordinal term) to distinguish the claim elements.
  • U.S. Provisional Patent Application Ser. No. 60/805,505, filed on Jun. 22, 2006, titled ENHANCED HARDNESS TOLERANCE OF CEDI MODULES, and U.S. Provisional Patent Application Ser. No. 60/805,510, filed on Jun. 22, 2006, titled METHODS TO REDUCE SCALING IN EDI DEVICES, are incorporated herein by reference.

Claims (65)

1. An electrodeionization apparatus having an anode compartment and a cathode compartment, comprising:
a first depleting compartment disposed between the anode compartment and the cathode compartment;
a concentrating compartment in ionic communication with the depleting compartment;
a second depleting compartment in ionic communication with the concentrating compartment; and
a first barrier cell in ionic communication with and disposed between the first depleting compartment and at least one of the anode compartment and the cathode compartment.
2. The electrodeionization apparatus of claim 1, wherein the first barrier cell is at least partially defined by a cation selective membrane disposed adjacent the first depleting compartment.
3. The electrodeionization apparatus of claim 2, wherein the first barrier cell is at least partially defined by an anion selective membrane and disposed adjacent the cathode compartment.
4. The electrodeionization apparatus of claim 3, further comprising a second barrier cell in ionic communication with the second depleting compartment,
wherein the first barrier cell contains a layer of media comprising a mixture of anion exchange media and cation exchange media and
wherein the second barrier cell contains a layer of media comprising a mixture of anion exchange media and cation exchange media.
5. (canceled)
6. The electrodeionization apparatus of claim 1, further comprising a second barrier cell in ionic communication with the second depleting compartment,
wherein the second barrier cell is disposed between the anode compartment and the second depleting compartment and
wherein the second barrier cell is at least partially defined by an anion selective membrane disposed adjacent the second depleting compartment.
7. (canceled)
8. The electrodeionization apparatus of claim 6, wherein the second barrier cell further comprises a cation selective membrane disposed adjacent the anode compartment.
9. (canceled)
10. (canceled)
11. An electrodeionization apparatus comprising:
a depleting compartment; and
a first concentrating compartment in ionic communication with the depleting compartment, and defined at least partially by an anion selective membrane and a cation selective membrane, the first concentrating compartment containing at least partially a first zone comprising substantially of cation exchange media that is substantially separated from the anion selective membrane by a second zone comprising substantially of anion exchange media.
12. The electrodeionization apparatus of claim 11, further comprising a second concentrating compartment in ionic communication with the depleting compartment, the second concentrating compartment defined at least partially by a cation selective membrane and an anion selective membrane and containing a first portion comprising ion exchange media and a second portion comprising ion exchange media, each of the first and second portions partially fills a lengthwise segment of the second concentrating compartment.
13. The electrodeionization apparatus of claim 12, wherein the first portion is predominantly comprised of cation exchange media and is disposed adjacent the cation selective membrane of the second concentrating compartment.
14. The electrodeionization apparatus of claim 13, wherein the second portion is substantially comprised of anion exchange media and is substantially separated from the cation selective membrane of the second compartment by the first portion of cation exchange media.
15. The electrodeionization apparatus of claim 11, wherein at least one of the first and second concentrating compartments further comprises electrochemically inert media.
16. The electrodeionization apparatus of claim 11, further comprising a source of an acidic solution in fluid communication with an inlet of the first concentrating compartment.
17. (canceled)
18. (canceled)
19. An electrodeionization apparatus comprising:
a depleting compartment;
a first concentrating compartment in ionic communication with the depleting compartment, the first concentrating compartment comprising media with a first effective current resistance; and
a second concentrating compartment in ionic communication with the depleting compartment, wherein a portion of the second concentrating compartment comprising media with a second effective current resistance greater than the first effective current resistance.
20. The electrodeionization apparatus of claim 19, wherein the second effective resistance of the at least a portion of the second concentrating compartment is at least two times greater than the first effective resistance.
21. (canceled)
22. (canceled)
23. (canceled)
24. (canceled)
25. An electrodeionization apparatus having at least one compartment with at least one outlet port defined by a distributor having a plurality of apertures, comprising:
a first layer of particles in the compartment bounded by ion selective membranes, the particles comprising media having a first effective diameter less than the smallest dimension of the apertures; and
a second layer of particles in the compartment downstream of the first layer, the second layer of particles having a second effective diameter greater than the first effective diameter and greater than the smallest dimension of the apertures.
26. The electrodeionization apparatus of claim 25, further comprising a third layer of particles disposed upstream of the first layer of particles.
27. (canceled)
28. The electrodeionization apparatus of claim 25, wherein at least one of the first layer, the second layer, and the third layer comprises ion exchange resin.
29. (canceled)
30. (canceled)
31. An electrodeionization system comprising:
a source of water to be treated;
a treating module comprising a depleting compartment and a concentrating compartment, the treating module fluidly connected to the source of water to be treated;
an electrolytic module comprising an acid-generating compartment, the electrolytic module fluidly connected upstream of the concentrating compartment; and
a source of a brine solution fluidly connected to an inlet of the acid-generating compartment of the electrolytic module.
32. The electrodeionization system of claim 31, wherein an outlet of the depleting compartment is fluidly connected to the inlet of the acid-generating compartment.
33. The electrodeionization system of claim 32, wherein the electrolytic module further comprises a base-generating compartment in ionic communication with the acid-generating compartment and wherein an outlet of the concentrating compartment is fluidly connected to an outlet of the base-generating compartment.
34. (canceled)
35. An electrodeionization apparatus comprising a compartment containing a mixture of first type of ion exchange resins and a second type of ion exchange resins, the first type of ion exchange resins having an average diameter at least 1.3 times greater than an average diameter of the second type of ion exchange resins.
36. (canceled)
37. (canceled)
38. (canceled)
39. (canceled)
40. An electrodeionization apparatus comprising:
a depleting compartment at least partially defined by a cation selective membrane and an anion selective membrane; and
a concentrating compartment at least partially defined by the anion selective membrane and containing a first layer of anion exchange media and a second layer of media disposed downstream of the first layer, the second layer comprising anion exchange media and cation exchange media.
41. The electrodeionization apparatus of claim 40, wherein the second layer is disposed downstream of the first layer, and comprises a first zone comprising cation exchange media that is substantially separated from the anion selective membrane by a second zone comprising anion exchange media.
42. (canceled)
43. (canceled)
44. (canceled)
45. (canceled)
46. A method of treating water in an electrodeionization device, comprising:
introducing water having anionic and cationic species into a depleting compartment of the electrodeionization device;
promoting transport of at least a portion of the cationic species into a first barrier cell disposed between the depleting compartment and a cathode compartment of the electrodeionization device; and
promoting transport of at least a portion of the anionic species into a second barrier cell disposed between the depleting compartment and an anode compartment of the electrodeionization device.
47. The method of claim 46, wherein promoting transport of at least a portion of the cationic species comprises inhibiting transport of the cationic species from the first barrier cell into the cathode compartment.
48. The method of claim 47, wherein promoting transport of at least a portion of the anionic species comprises inhibiting transport of the anionic species from the second barrier cell into the anode compartment, and further comprising introducing at least a portion of water leaving the depleting compartment into at least one of the cathode compartment and the anode compartment.
49. (canceled)
50. The method of claim 46, further comprising maintaining a fluid flow velocity of greater than 2 gallons per minute per square foot through the concentrating compartment.
51. (canceled)
52. A method of treating water, comprising:
introducing water to be treated into a depleting compartment of an electrodeionization device, the depleting compartment having at least one layer of ion exchange media; and
promoting transport of at least a portion of anionic species from the water introduced into the depleting compartment from a first layer of ion exchange media into a first concentrating compartment to produce water having a first intermediate quality, the first concentrating compartment defined at least partially by an anion selective membrane and a cation selective membrane, the first concentrating compartment containing at least partially a first zone comprising cation exchange media that is substantially separated from the anion selective membrane by a second zone comprising anion exchange media and
comprising maintaining a fluid flow velocity of greater than 2 gallons per minute per square foot through the first concentrating compartment.
53. (canceled)
54. A method of treating water in an electrodeionization device comprising:
introducing water to be treated comprising undesirable species into a depleting compartment of the electrodeionization device;
promoting transport of the undesirable species from the depleting compartment to a concentrating compartment of the electrodeionization device to produce the treated water;
electrolytically generating an acid solution and a basic solution in the ancillary module;
introducing at least a portion of the acid solution into the concentrating compartment.
55. The method of claim 54, wherein electrolytically generating the acid solution comprises introducing a halide salt solution into the ancillary module.
56. (canceled)
57. The method of claim 56, further comprising neutralizing an outlet stream from the concentrating compartment with the basic solution.
58. The method of claim 57, further comprising mixing a portion of the treated water with the brine solution and introducing the mixture into the ancillary module.
59. The method of claim 58, wherein introducing the acid solution into the concentrating compartment comprises introducing an acidic solution having a pH of less than 4.3 into the concentrating compartment.
60. (canceled)
61. A water treatment system comprising:
a source of a water to be treated; and
an electrodeionization device comprising a first depleting compartment and a second depleting compartment, each of the first and second depleting compartment fluidly connected to the source of water to be treated in a parallel flow configuration; and a first concentrating compartment in ionic communication with the first depleting compartment and a second concentrating compartment fluidly connected to downstream of the first concentrating compartment.
62. The system of claim 61, wherein the electrodeionization device further comprises a first electrode compartment fluidly connected upstream of the first concentrating compartment.
63. An electrodeionization apparatus comprising:
a plurality of depleting compartments configured to have liquid flowing therein along parallel flow paths; and
a plurality of concentrating compartments in ionic communication with at least one depleting compartment, wherein at least portion of the concentrating compartments are arranged serially.
64. The electrodeionization apparatus of claim 63, wherein the plurality of concentrating compartment define a single flow path through the electrodeionization apparatus.
65. The electrodeionization apparatus of claim 40, wherein the concentrating compartment is fluidly connected downstream of a chiller.
US11/767,438 2006-06-22 2007-06-22 Low scale potential water treatment Abandoned US20080067069A1 (en)

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JP2010600009U JP3161750U (en) 2007-04-18 2008-04-17 Water treatment with low scale potential
BRPI0810227 BRPI0810227A2 (en) 2007-04-18 2008-04-17 Water treatment with low incrustation potential
US12/596,279 US20100213066A1 (en) 2006-06-22 2008-04-17 Low scale potential water treatment
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US13/690,866 US9023185B2 (en) 2006-06-22 2012-11-30 Low scale potential water treatment
US14/621,901 US20150225268A1 (en) 2006-06-22 2015-02-13 Low scale potential water treatment
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7658828B2 (en) 2005-04-13 2010-02-09 Siemens Water Technologies Holding Corp. Regeneration of adsorption media within electrical purification apparatuses
US20110042214A1 (en) * 2006-10-18 2011-02-24 Rath David F Electroregeneration apparatus and water treatment method
US20110131994A1 (en) * 2009-12-04 2011-06-09 General Electric Company Economical and Sustainable Disposal of Zero Liquid Discharge Salt Byproduct
US8871073B2 (en) 2010-06-03 2014-10-28 Organo Corporation Electrodeionization apparatus for producing deionized water
US9011660B2 (en) 2007-11-30 2015-04-21 Evoqua Water Technologies Llc Systems and methods for water treatment
US9023185B2 (en) 2006-06-22 2015-05-05 Evoqua Water Technologies Llc Low scale potential water treatment
US9339765B2 (en) 2011-09-16 2016-05-17 General Electric Company Electrodialysis method and apparatus for passivating scaling species
US9724645B2 (en) 2012-02-02 2017-08-08 Tangent Company Llc Electrochemically regenerated water deionization

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4978593B2 (en) * 2008-09-01 2012-07-18 三浦工業株式会社 Pure water production system
JP5355460B2 (en) * 2010-03-16 2013-11-27 オルガノ株式会社 Electric deionized water production equipment
US8834663B2 (en) 2011-06-10 2014-09-16 Dow Global Technologies Llc Electrodeionization device including ion exchange spacer and method of assembly
CN106277212A (en) * 2016-09-06 2017-01-04 深圳市君想环境科技有限公司 A kind of electrochemical desalting device

Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2794776A (en) * 1954-03-16 1957-06-04 Robert E Briggs Water purification process
US3291713A (en) * 1964-05-27 1966-12-13 Ionics Removal of weakly basic substances from solution by electrodeionization
US3686089A (en) * 1967-07-25 1972-08-22 Emmanuel Korngold Method of separation of ions from a solution
US5116509A (en) * 1989-09-08 1992-05-26 Millipore Corporation Electrodeionization and ultraviolet light treatment method for purifying water
US5286354A (en) * 1992-11-30 1994-02-15 Sachem, Inc. Method for preparing organic and inorganic hydroxides and alkoxides by electrolysis
US6284124B1 (en) * 1999-01-29 2001-09-04 United States Filter Corporation Electrodeionization apparatus and method
US6344122B1 (en) * 1999-07-13 2002-02-05 Kurita Water Industries Ltd. Electrodeionization apparatus
US6365023B1 (en) * 2000-06-22 2002-04-02 Millipore Corporation Electrodeionization process
US20020139676A1 (en) * 2000-05-10 2002-10-03 Jacques Moulin Electrodeionization module
US20020189951A1 (en) * 2001-05-29 2002-12-19 Li-Shiang Liang Electrodeionization apparatus and method
US6733646B2 (en) * 2001-01-05 2004-05-11 Kurita Water Industries Ltd. Method and apparatus for electrodeionization of water
US20040206627A1 (en) * 2003-04-11 2004-10-21 Bejtlich Chester L. Electrodeionization device
US20050103722A1 (en) * 2003-11-13 2005-05-19 United States Filter Corporation Water treatment system and method
US20060037862A1 (en) * 2002-11-15 2006-02-23 Masayuki Miwa Electrodeionization apparatus
US20060060532A1 (en) * 2004-09-13 2006-03-23 The University Of South Carolina Water desalination process and apparatus
US20060231403A1 (en) * 2005-04-14 2006-10-19 Riviello John M Chambered electrodeionization apparatus with uniform current density, and method of use
US7147785B2 (en) * 2000-09-28 2006-12-12 Usfilter Corporation Electrodeionization device and methods of use

Family Cites Families (425)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2535035A (en) 1945-04-30 1950-12-26 Robert E Briggs Method of electrolytic water softening and ph adjustment
US2514415A (en) 1946-02-27 1950-07-11 Carl H Rasch Storage battery paste with ion exchange expander
NL162669C (en) 1950-07-21 Du Pont A process for the preparation of a fluoropolymer.
US2681320A (en) 1950-12-23 1954-06-15 Rohm & Haas Permselective films of cationexchange resins
US2681319A (en) 1951-01-10 1954-06-15 Rohm & Haas Permselective films of anionexchange resins
US2815320A (en) 1953-10-23 1957-12-03 Kollsman Paul Method of and apparatus for treating ionic fluids by dialysis
GB776469A (en) 1953-12-17 1957-06-05 Tno Process and apparatus for the electrolytic deionisation of salt-containing liquids
US2854394A (en) 1954-11-01 1958-09-30 Kollsman Paul Method of and apparatus for fractionation by electrodialysis
US2777814A (en) 1954-12-02 1957-01-15 Gen Electric Water heating and demineralizing apparatus
US2912372A (en) 1955-05-12 1959-11-10 Gen Electric Water treatment methods
NL95176C (en) 1955-07-30
US2906684A (en) 1956-01-30 1959-09-29 Gen Electric Water demineralizing units
US2788319A (en) 1956-02-07 1957-04-09 Clayton Manufacturing Co Ion exchange method and apparatus
US2794777A (en) 1956-08-27 1957-06-04 Clayton Manufacturing Co Electrolytic deionization
US3296112A (en) 1957-07-16 1967-01-03 Kollsman Paul Method of modifying the chemical composition of substances by ion transfer
GB877239A (en) 1957-12-24 1961-09-13 Permutit Co Ltd Improvements relating to electrodialytic cells
GB879181A (en) 1958-02-03 1961-10-04 Permutit Co Ltd Improvements relating to the removal of dissolved solids from liquids
GB882601A (en) 1958-05-07 1961-11-15 Permutit Co Ltd Improvements relating to the treatment of aqueous liquids by electro-dialysis
GB880344A (en) 1958-06-19 1961-10-18 Permutit Co Ltd Improvements relating to electrodialytic cells
GB876707A (en) 1959-03-26 1961-09-06 Permutit Co Ltd Improvements in electrodialytic and similar processes and apparatus
US3074864A (en) 1959-04-21 1963-01-22 Gen Electric Methods of and apparatus for demineralizing raw water
GB893051A (en) 1959-04-30 1962-04-04 John Thompson Kennicott Ltd Improvements in or relating to an electrodialysis apparatus
US3375182A (en) 1959-05-22 1968-03-26 American Mach & Foundry Electrodialysis method and apparatus having radially symmetrical flow paths
NL256388A (en) 1959-10-02
US3091583A (en) 1959-10-27 1963-05-28 Aqua Ionics Inc Electrodialysis cell
GB942762A (en) 1960-05-13 1963-11-27 John Thompson Kennicott Ltd A method of packing a receptacle with comminuted material
NL133594C (en) 1960-11-28
US3099615A (en) 1961-02-13 1963-07-30 Kollsman Paul Electrodialysis involving periodic current reversal
DE1225569B (en) 1961-05-20 1966-09-22 Paul Dosch Method and apparatus for water softening for laundry detergents and Dishwashing
NL288721A (en) 1962-02-19
US3165460A (en) 1962-04-11 1965-01-12 American Mach & Foundry Electrolytic acid generator
GB1048026A (en) 1962-05-04 1966-11-09 American Mach & Foundry Ion exchange materials
NL294289A (en) 1962-06-20
DE1201055B (en) 1962-09-27 1965-09-16 Wolfen Filmfab Veb ion exchange membranes heterogeneous method for preparing
US3341441A (en) 1964-01-07 1967-09-12 Ionics Method for preventing scale buildup during electrodialysis operation
GB1137679A (en) 1965-02-24 1968-12-27 Wallace Tiernan Inc Procedures and apparatus for electrodialytic treatment of liquids
US3375208A (en) 1967-07-26 1968-03-26 Esb Inc Method for preparing a microporous thermoplastic resin material
US3630378A (en) 1968-05-24 1971-12-28 Dow Chemical Co Novel water treating and storage apparatus
US3627703A (en) 1968-10-31 1971-12-14 Mitsubishi Petrochemical Co Polypropylene resin composites and production thereof
US3645884A (en) 1969-07-10 1972-02-29 Edwin R Gilliland Electrolytic ion exchange apparatus
GB1318036A (en) 1969-10-29 1973-05-23 Permutit Co Ltd Ion-exchange treatment of liquids and apparatus for use therein
US3679055A (en) 1970-07-15 1972-07-25 Polymetrics Inc Reverse osmosis water purifier
US3639231A (en) 1970-11-13 1972-02-01 Bresler And Associates Inc Desalination process
JPS4916189B1 (en) 1970-12-23 1974-04-20
US3755135A (en) 1971-01-20 1973-08-28 A Johnson Electric demineralizing apparatus
US3989615A (en) 1971-07-06 1976-11-02 Nippon Soda Company Limited Diaphragm process electrolytic cell
US3786924A (en) 1971-07-22 1974-01-22 Delro Inc Water purification system
JPS545888Y2 (en) 1971-12-16 1979-03-16
BE794634A (en) 1972-01-28 1973-07-26 Rhone Poulenc Sa Apparatus membrane separator
US4359789A (en) 1972-01-31 1982-11-23 Monogram Industries, Inc. Sewerless disposal system
JPS5112313B2 (en) 1972-09-01 1976-04-17
US3869376A (en) 1973-05-14 1975-03-04 Alvaro R Tejeda System for demineralizing water by electrodialysis
JPS532160B2 (en) 1973-08-17 1978-01-25
US3870033A (en) 1973-11-30 1975-03-11 Aqua Media Ultra pure water process and apparatus
US4089758A (en) 1974-05-24 1978-05-16 Imperial Chemical Industries Limited Electrolytic process
US4167551A (en) 1974-10-21 1979-09-11 Mitsubishi Petrochemical Company Limited Process for the production of an ion exchange membrane
CH586059A5 (en) 1974-11-29 1977-03-31 Yeda Res & Dev
JPS5247580A (en) 1975-10-14 1977-04-15 Mitsubishi Heavy Ind Ltd Desalting method by electrodialysis
US4032452A (en) 1975-11-13 1977-06-28 Sybron Corporation Electrically regenerated ion exchange system
US4130473A (en) 1976-03-05 1978-12-19 Eddleman William L Electrode structure for use in metal in exchange apparatus useful in purifying spent acids and the like
US4102752A (en) 1976-07-09 1978-07-25 Rugh Ii John L Municipal water supply system
US4116889A (en) 1976-08-19 1978-09-26 Allied Chemical Corporation Bipolar membranes and method of making same
US4119581A (en) 1977-02-23 1978-10-10 California Institute Of Technology Membrane consisting of polyquaternary amine ion exchange polymer network interpenetrating the chains of thermoplastic matrix polymer
DE2708240A1 (en) 1977-02-25 1978-08-31 Siemens Ag Water softening system - passing hard water over conductive material at negative potential to water contacting counter electrode
US4191811A (en) 1977-03-01 1980-03-04 Ionics, Incorported Ion exchange membranes based upon polyphenylene sulfide and fluorocarbon polymeric binder
US4162218A (en) 1977-06-27 1979-07-24 Mccormick Gerald L Water reuse system
US4202772A (en) 1977-08-04 1980-05-13 Ionics, Incorporated Fluid distribution cell module
IL52758D0 (en) 1977-08-16 1977-10-31 Yeda Res & Dev Improved device for electrodialysis
IL52757D0 (en) 1977-08-16 1977-10-31 Yeda Res & Dev Dimensionally stable ion exchange membranes for electrodialysis
DE2739335B2 (en) 1977-09-01 1980-01-10 Blutspendedienst Der Landesverbaende Des Deutschen Roten Kreuzes Niedersachsen, Oldenburg Und Bremen Gemeinnuetzige Gmbh, 3257 Springe
US4153761A (en) 1978-04-21 1979-05-08 The United States Of America As Represented By The Secretary Of The Army Method of removing foulants from ion exchange resins
JPS5512141A (en) 1978-07-13 1980-01-28 Mitsubishi Petrochem Co Ltd Manufacturing of ion exchange membrane
US4197206A (en) 1978-09-13 1980-04-08 Karn William S Heat sealable ion permeable membranes
US4228000A (en) 1979-01-08 1980-10-14 Hoeschler Frank A Water treatment apparatus with means for automatic disinfection thereof
US4374232A (en) 1979-01-26 1983-02-15 Gelman Sciences Inc. Graft copolymer membrane and processes of manufacturing and using the same
US4216073A (en) 1979-05-29 1980-08-05 Ionics Inc. Ion exchange resin containing activated carbon
US4330654A (en) 1980-06-11 1982-05-18 The Dow Chemical Company Novel polymers having acid functionality
US4358545A (en) 1980-06-11 1982-11-09 The Dow Chemical Company Sulfonic acid electrolytic cell having flourinated polymer membrane with hydration product less than 22,000
US4321145A (en) 1980-06-11 1982-03-23 Carlson Lee G Ion exchange treatment for removing toxic metals and cyanide values from waste waters
US4298442A (en) 1980-08-04 1981-11-03 Ionics, Incorporated Electrodialysis process for silica removal
US4430226A (en) 1981-03-09 1984-02-07 Millipore Corporation Method and apparatus for producing ultrapure water
US4465573A (en) 1981-05-12 1984-08-14 Hare Harry M O Method and apparatus for the purification of water
WO1983003984A1 (en) 1982-05-13 1983-11-24 Gerhard Kunz Method for the treatment of a liquid phase, particularly method for desalting aqueous solutions, as well as device for its implementation
SU1118389A1 (en) 1982-10-05 1984-10-15 Предприятие П/Я М-5885 Electric dialyzer
DE3238280A1 (en) 1982-10-15 1984-04-19 Lieber Hans Wilhelm Prof Dr In Process for desalting solutions
JPS645888Y2 (en) 1982-11-05 1989-02-14
US4505797A (en) 1983-03-24 1985-03-19 Ionics, Incorporated Ion-exchange membranes reinforced with non-woven carbon fibers
US4473450A (en) 1983-04-15 1984-09-25 Raychem Corporation Electrochemical method and apparatus
IL68773D0 (en) 1983-05-24 1983-12-30 Yeda Res & Dev Modular electrodialysis device
US4636296A (en) 1983-08-18 1987-01-13 Gerhard Kunz Process and apparatus for treatment of fluids, particularly desalinization of aqueous solutions
US4775480A (en) 1983-10-18 1988-10-04 Gnb Incorporated Membrane processes for treatment of and recovery of components from kraft black liquors
JPS6159793B2 (en) 1983-12-20 1986-12-18 Nippon Paint Co Ltd
US4610790A (en) 1984-02-10 1986-09-09 Sterimatics Company Limited Partnership Process and system for producing sterile water and sterile aqueous solutions
US4574049B1 (en) 1984-06-04 1999-02-02 Ionpure Filter Us Inc Reverse osmosis system
DE3423653C2 (en) 1984-06-27 1993-08-19 Edr Acquisition Corp., Westport, Conn., Us
US4925541B1 (en) 1984-07-09 1994-08-02 Millipore Corp Electrodeionization apparatus and method
US4956071A (en) 1984-07-09 1990-09-11 Millipore Corporation Electrodeionization apparatus and module
USRE35741E (en) 1984-07-09 1998-03-10 Millipore Corporation Process for purifying water
US5154809A (en) 1984-07-09 1992-10-13 Millipore Corporation Process for purifying water
EP0170895B1 (en) 1984-07-09 1989-03-22 Millipore Corporation Improved electrodeionization apparatus and method
US4599178A (en) 1984-07-16 1986-07-08 Shell Oil Company Recovery of glycerine from saline waters
GB8513114D0 (en) 1985-05-23 1985-06-26 Ici Plc Membranes
JPS6247580A (en) 1985-08-27 1987-03-02 Daido Steel Co Ltd Vibrationproof type bimetal
US4614576A (en) 1985-10-22 1986-09-30 Ionics, Incorporated Microliter scale electrodialysis apparatus
US4671863A (en) 1985-10-28 1987-06-09 Tejeda Alvaro R Reversible electrolytic system for softening and dealkalizing water
ZA8700553B (en) 1986-01-31 1988-03-30 Water Res Commission Dewatering slurries
US4661411A (en) 1986-02-25 1987-04-28 The Dow Chemical Company Method for depositing a fluorocarbonsulfonic acid polymer on a support from a solution
US4894128A (en) 1986-05-05 1990-01-16 The Dow Chemical Company Membrane unit for electrolytic cell
EP0246070B1 (en) 1986-05-16 1991-01-16 Electroplating Engineers of Japan Limited Process and apparatus for recovery of precious metal compound
EP0253119A3 (en) 1986-06-13 1989-07-19 Asahi Glass Company Ltd. Ion exchange membrane for electrolysis
GB8614707D0 (en) 1986-06-17 1986-07-23 Ici Plc Electrolytic cell
DE3623796A1 (en) 1986-07-15 1988-01-28 Dow Chemical Rheinwerk Gmbh Apparatus and adsorption processes for selective removal of ions from liquids
JPH07106350B2 (en) 1986-07-31 1995-11-15 バブコツク日立株式会社 Operating method of electrodialysis desalination equipment
US4707240A (en) 1986-09-15 1987-11-17 Ionics Incorporated Method and apparatus for improving the life of an electrode
GB8622749D0 (en) 1986-09-22 1986-10-29 Ici Plc Electrolytic cell & gasket
US4753681A (en) 1986-09-30 1988-06-28 Millipore Corporation Method for defouling electrodeionization apparatus
US4747929A (en) 1986-10-01 1988-05-31 Millipore Corporation Depletion compartment and spacer construction for electrodeionization apparatus
US4804451A (en) 1986-10-01 1989-02-14 Millipore Corporation Depletion compartment for deionization apparatus and method
US4751153A (en) 1987-01-02 1988-06-14 Continental Can Company, Inc. Frame for a cell construction
IT1202425B (en) 1987-01-26 1989-02-09 Giuseppe Bianchi electrochemical process for the deoxygenation of corrosion control in deionized water
DE3704546C2 (en) 1987-02-13 1988-11-17 Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe, De
US4747955A (en) 1987-04-13 1988-05-31 The Graver Company Purification of liquids with treated polyester fibers
US4931160A (en) 1987-05-11 1990-06-05 Millipore Corporation Electrodeionization method and apparatus
US4770756A (en) 1987-07-27 1988-09-13 Olin Corporation Electrolytic cell apparatus
US5227040A (en) 1987-07-30 1993-07-13 Unisearch Limited High performance bipolar membranes
US4808287A (en) 1987-12-21 1989-02-28 Hark Ernst F Water purification process
US4849102A (en) 1988-05-31 1989-07-18 Filtron Technology Corporation Bidirectional ultrafiltration apparatus
US4969983A (en) 1988-07-11 1990-11-13 Ionics, Incorporated Apparatus and process for the removal of acidic and basic gases from fluid mixtures using bipolar membranes
US4871431A (en) 1988-07-11 1989-10-03 Ionics, Incorporated Apparatus for the removal of dissolved solids from liquids using bipolar membranes
US4915803A (en) 1988-09-26 1990-04-10 The Dow Chemical Company Combination seal and frame cover member for a filter press type electrolytic cell
US4898653A (en) 1988-09-26 1990-02-06 The Dow Chemical Company Combination electrolysis cell seal member and membrane tentering means
US4940518A (en) 1988-09-26 1990-07-10 The Dow Chemical Company Combination seal member and membrane holder for a filter press type electrolytic cell
US4892632A (en) 1988-09-26 1990-01-09 The Dow Chemical Company Combination seal member and membrane holder for an electrolytic cell
US4964970A (en) 1988-10-05 1990-10-23 Hoh Water Technology Corp. Compact low volume water purification apparatus
FR2637817B1 (en) 1988-10-17 1992-10-09 Eurodia Sa Setting spacer for exchange between two fluids devices
US4983267A (en) 1988-10-18 1991-01-08 Innova/Pure Water, Inc. Water deionization and contaminants removal or degradation
CN1021828C (en) 1989-01-24 1993-08-18 上海市合成树脂研究所 Continuous prepn. of ion exchange membrane used for different phase
FR2642985B1 (en) 1989-02-13 1992-03-06 Asahi Chemical Ind SEAL FOR USE in an electrodialysis apparatus
US5489370A (en) 1989-05-08 1996-02-06 Ionex Removal of ions from a bulk source by electropotential ion transport using a host receptor matrix
JPH02307514A (en) 1989-05-19 1990-12-20 Babcock Hitachi Kk Electrodialyzer
US5254227A (en) 1989-06-16 1993-10-19 Olin Corporation Process for removing catalyst impurities from polyols
US5026465A (en) 1989-08-03 1991-06-25 Ionics, Incorporated Electrodeionization polarity reversal apparatus and process
JPH0647105B2 (en) 1989-12-19 1994-06-22 株式会社荏原総合研究所 Pure water or ultrapure water purifying method and apparatus
US5106465A (en) 1989-12-20 1992-04-21 Olin Corporation Electrochemical process for producing chlorine dioxide solutions from chlorites
US5092970A (en) 1989-12-20 1992-03-03 Olin Corporation Electrochemical process for producing chlorine dioxide solutions from chlorites
US5084148A (en) 1990-02-06 1992-01-28 Olin Corporation Electrochemical process for producing chloric acid - alkali metal chlorate mixtures
US5066375A (en) 1990-03-19 1991-11-19 Ionics, Incorporated Introducing and removing ion-exchange and other particulates from an assembled electrodeionization stack
US5203976A (en) 1990-03-19 1993-04-20 Ionics, Incorporated Introducing and removing ion-exchange and other particulates rom an assembled electrodeionization stack
US5120416A (en) 1990-03-19 1992-06-09 Ionics, Incorporated Introducing and removing ion-exchange and other particulates from an assembled electrodeionization stack
US5059330A (en) 1990-04-02 1991-10-22 Burkhardt Donald O Gray water reclamation method and apparatus
US5192432A (en) 1990-04-23 1993-03-09 Andelman Marc D Flow-through capacitor
US5196115A (en) 1990-04-23 1993-03-23 Andelman Marc D Controlled charge chromatography system
FR2662114B1 (en) 1990-05-15 1994-04-29 Eurodia Sa Method of manufacturing a separator frame for stacking in an exchange device.
DE4016000C2 (en) 1990-05-18 1993-10-21 Hager & Elsaesser Device for treating metal-containing liquids by ion exchange and simultaneous or periodic regeneration of the ion exchange resin by electrodialysis
US5032265A (en) 1990-06-20 1991-07-16 Millipore Corporation Method and system for producing sterile aqueous solutions
JP2865389B2 (en) 1990-07-10 1999-03-08 オルガノ株式会社 Electric deionized water production equipment and frame used for it
AU658845B2 (en) 1990-08-20 1995-05-04 Abbott Laboratories Medical drug formulation and delivery system
FR2666245B1 (en) 1990-08-31 1992-10-23 Lyonnaise Eaux method for controlling the operating modes of an automatic water filtration device to the tubular membranes.
US5126026A (en) 1990-09-28 1992-06-30 Allied-Signal Inc. Guard membranes for use in electrodialysis cells
US5064097A (en) 1990-10-10 1991-11-12 Water Center International Ltd. Compact water purification and beverage dispensing apparatus
FR2668077B1 (en) 1990-10-22 1992-12-04 Commissariat Energie Atomique Reverse osmosis membrane or nanofiltration and process for its manufacturing.
US5082472A (en) 1990-11-05 1992-01-21 Mallouk Robert S Composite membrane for facilitated transport processes
DE69120295D1 (en) 1990-12-17 1996-07-18 Ionpure Techn Corp Electrodeionizing device
USH1206H (en) 1991-01-24 1993-07-06 The United States Of America As Represented By The Secretary Of The Air Force Cascade crossflow tower
US5176828A (en) 1991-02-04 1993-01-05 Millipore Corporation Manifold segment stack with intermediate feed manifold
US5128043A (en) 1991-02-13 1992-07-07 Wildermuth Glen W Method and apparatus for purifying liquids
DE69204187T2 (en) 1991-03-13 1996-01-25 Ebara Corp Electrically regenerable demineralization device.
IL97543A (en) 1991-03-14 1994-11-11 Yeda Res & Dev Electrodialysis reversal process and apparatus with bipolar membranes for hard-water softening
US5211823A (en) 1991-06-19 1993-05-18 Millipore Corporation Process for purifying resins utilizing bipolar interface
US5259936A (en) 1991-06-19 1993-11-09 Millipore Corporation Purified ion exchange resins and process
US5107896A (en) 1991-07-09 1992-04-28 John J. Gianfrancesco Multi-functional valve
US5158683A (en) 1991-09-03 1992-10-27 Ethyl Corporation Bromide separation and concentration using semipermeable membranes
EP0531999A1 (en) 1991-09-11 1993-03-17 Asahi Glass Company Ltd. Method for producing an acid and/or alkali metal hydroxide
FR2684250B1 (en) 1991-11-27 1994-04-01 Merlin Gerin System of distribution of high quality electrical energy.
US5344566A (en) 1992-03-17 1994-09-06 Clancey William F Deleading wastewater reduction process
JPH05262902A (en) 1992-03-23 1993-10-12 Stonehard Assoc Inc Preparation of ion-exchange membrane
JP3018729B2 (en) 1992-03-25 2000-03-13 栗田工業株式会社 Industrial antibacterial agent
US5316740A (en) 1992-03-26 1994-05-31 Los Alamos Technical Associates, Inc. Electrolytic cell for generating sterilization solutions having increased ozone content
US5364439A (en) 1992-04-29 1994-11-15 Union Oil Company Of California Method to treat geothermal fluid streams
ES2092267T3 (en) 1992-05-15 1996-11-16 Christ Ag Device for continuous electrochemical desalination of aqueous solutions.
US5166220A (en) 1992-06-01 1992-11-24 Mcmahon John M Water softening process
JP2723422B2 (en) 1992-06-18 1998-03-09 株式会社トクヤマ Production method of domestic water
AU629790B3 (en) 1992-06-29 1992-10-08 William Harold Jay An electrochemical process employing a modified polymeric foam to enhance the recoverability of metal values from solution
FR2692882B1 (en) 1992-06-29 1994-10-07 Trailigaz Treatment process, including drinkable waters, ozone. Installation for carrying out the method Óoeuvre.
US5358640A (en) 1992-07-20 1994-10-25 Nalco Chemical Company Method for inhibiting scale formation and/or dispersing iron in reverse osmosis systems
US5292422A (en) 1992-09-15 1994-03-08 Ip Holding Company Modules for electrodeionization apparatus
US5346924B1 (en) 1992-09-23 2000-04-25 Ionpure Techn Corp Heterogenous ion exchange materials comprising polyethylene of linear low density or high density high molecular weight
US5244579A (en) 1992-10-09 1993-09-14 Zenon Environmental Inc. Transportable reverse osmosis water purification unit
DE4238532A1 (en) 1992-11-14 1994-05-19 Kunz Gerhard K Method and device for desalting aqueous solutions using ion exchange materials
US5346624A (en) 1993-01-11 1994-09-13 The Graver Company Method and apparatus for treatment of aqueous solutions
US5254257A (en) 1993-01-19 1993-10-19 Culligan International Company Reclaiming of spent brine
IN181196B (en) 1993-01-20 1998-04-25 Raju Manjarabad Venkataramanas
US5356849A (en) 1993-01-21 1994-10-18 Calgon Carbon Corporation Catalytic carbon
US5444031A (en) 1993-01-21 1995-08-22 Calgon Carbon Corporation Process for making catalytic carbon
JP2751090B2 (en) 1993-04-21 1998-05-18 日本錬水株式会社 Pure water production equipment
US5538611A (en) 1993-05-17 1996-07-23 Marc D. Andelman Planar, flow-through, electric, double-layer capacitor and a method of treating liquids with the capacitor
EP0680932B1 (en) 1994-05-06 2001-08-08 AEA Technology plc Electrochemical deionisation
JP3184015B2 (en) 1993-08-10 2001-07-09 株式会社トクヤマ Ultrapure water production equipment
US6402916B1 (en) 1993-10-27 2002-06-11 Richard L. Sampson Electrolytic process and apparatus controlled regeneration of modified ion exchangers to purify aqueous solutions and adjust ph
US5434020A (en) 1993-11-15 1995-07-18 The Regents Of The University Of California Continuous-feed electrochemical cell with nonpacking particulate electrode
US5411641A (en) 1993-11-22 1995-05-02 E. I. Du Pont De Nemours And Company Electrochemical conversion of anhydrous hydrogen halide to halogen gas using a cation-transporting membrane
JPH07155750A (en) 1993-12-07 1995-06-20 Mitsubishi Rayon Co Ltd Hot-water sterilization method for water purifier
JP3187629B2 (en) 1993-12-16 2001-07-11 オルガノ株式会社 Reverse osmosis membrane treatment method
US5460728A (en) 1993-12-21 1995-10-24 Shell Oil Company Method for inhibiting the plugging of conduits by gas hydrates
US5518626A (en) 1993-12-23 1996-05-21 United Technologies Corporation Process employing thermally sterilizable aqueous polishing agents
EP0670184B1 (en) 1994-03-01 2001-09-05 Mitsubishi Chemical Corporation Method of demineralizing water or an aqueous solution
JP3090841B2 (en) 1994-03-29 2000-09-25 オルガノ株式会社 Electric deionized water production equipment
AU2108195A (en) 1994-03-30 1995-10-23 Tingsheng Wang Process and apparatus for regeneration of resins in fixed double-bed type
IL109240A (en) 1994-04-07 1998-02-22 Yeda Res & Dev Ion exchange membranes
US5503729A (en) 1994-04-25 1996-04-02 Ionics Incorporated Electrodialysis including filled cell electrodialysis (electrodeionization)
US5584981A (en) 1994-05-06 1996-12-17 United Kingdom Atomic Energy Authority Electrochemical deionization
EP0683136A3 (en) 1994-05-06 1998-05-13 AEA Technology plc Silver removal
US5451309A (en) 1994-05-09 1995-09-19 B&W Nuclear Technologies, Inc. Ion exchange resin regeneration apparatus
US5425858A (en) 1994-05-20 1995-06-20 The Regents Of The University Of California Method and apparatus for capacitive deionization, electrochemical purification, and regeneration of electrodes
US6309532B1 (en) 1994-05-20 2001-10-30 Regents Of The University Of California Method and apparatus for capacitive deionization and electrochemical purification and regeneration of electrodes
DE69532281T2 (en) 1994-05-20 2004-09-30 United States Filter Corp., Palm Desert Method and device for electrical deionization with polarity switching and double reverse
DE4418812C2 (en) 1994-05-30 1999-03-25 Forschungszentrum Juelich Gmbh Single and multiple electrolysis cells and arrangements thereof for the deionization of aqueous media
US20030038089A1 (en) 1994-06-17 2003-02-27 Ehud Levy Method of reducing contaminants in drinking water
US6241893B1 (en) 1994-06-17 2001-06-05 Ehud Levy Water filtration media, apparatus and processes
US5538746A (en) 1994-06-17 1996-07-23 Levy; Ehud Process for filtering water prior to carbonation
US5460725A (en) 1994-06-21 1995-10-24 The Dow Chemical Company Polymeric adsorbents with enhanced adsorption capacity and kinetics and a process for their manufacture
US5538655A (en) 1994-06-29 1996-07-23 Arthur D. Little, Inc. Molecular complexes for use as electrolyte components
JP3200301B2 (en) 1994-07-22 2001-08-20 オルガノ株式会社 Method and apparatus for producing pure or ultrapure water
US5520816A (en) 1994-08-18 1996-05-28 Kuepper; Theodore A. Zero waste effluent desalination system
US5458787A (en) 1994-10-27 1995-10-17 Uop Extraction of certain metal cations from aqueous solutions
JP3273707B2 (en) 1994-11-29 2002-04-15 オルガノ株式会社 Production method of deionized water by electrodeionization method
US6248226B1 (en) 1996-06-03 2001-06-19 Organo Corporation Process for producing deionized water by electrodeionization technique
WO1997046492A1 (en) 1994-11-29 1997-12-11 Organo Corporation Process for producing deionized water by electrical deionization technique
WO1997046491A1 (en) 1994-11-29 1997-12-11 Organo Corporation Process for producing deionized water by electrical deionization technique
US5647939A (en) 1994-12-05 1997-07-15 Integrated Liner Technologies, Inc. Method of bonding a cured elastomer to plastic and metal surfaces
JP3489922B2 (en) 1994-12-22 2004-01-26 日東電工株式会社 Method for producing highly permeable composite reverse osmosis membrane
WO1996022162A1 (en) 1995-01-19 1996-07-25 Asahi Glass Company Ltd. Porous ion exchanger and method for producing deionized water
US5635071A (en) 1995-01-20 1997-06-03 Zenon Airport Enviromental, Inc. Recovery of carboxylic acids from chemical plant effluents
US5591344A (en) 1995-02-13 1997-01-07 Aksys, Ltd. Hot water disinfection of dialysis machines, including the extracorporeal circuit thereof
US5599614A (en) 1995-03-15 1997-02-04 W. L. Gore & Associates, Inc. Integral composite membrane
US5547551A (en) 1995-03-15 1996-08-20 W. L. Gore & Associates, Inc. Ultra-thin integral composite membrane
CA2215977A1 (en) 1995-03-23 1996-09-26 Arthur L. Goldstein Improvements in membrane processes including electrodialysis
US5783050A (en) 1995-05-04 1998-07-21 Eltech Systems Corporation Electrode for electrochemical cell
US5670053A (en) 1995-08-07 1997-09-23 Zenon Environmental, Inc. Purification of gases from water using reverse osmosis
US5766479A (en) 1995-08-07 1998-06-16 Zenon Environmental Inc. Production of high purity water using reverse osmosis
US5762421A (en) 1995-10-25 1998-06-09 Grayling Industries, Inc. Reusable bulk bag with liner
DE19542475C2 (en) 1995-11-15 1999-10-28 Ballard Power Systems Polymer electrolyte membrane fuel cell and method for producing a distributor plate for such a cell
JP3518112B2 (en) 1995-12-06 2004-04-12 東京瓦斯株式会社 Fuel cell water treatment equipment
GB9600633D0 (en) 1996-01-12 1996-03-13 Glegg Water Conditioning Inc Elecrodeionization apparatus having geometric arrangement of ion exchange material
GB9602625D0 (en) 1996-02-09 1996-04-10 Clegg Water Conditioning Inc Modular apparatus for the demineralisation of liquids
US5868937A (en) 1996-02-13 1999-02-09 Mainstream Engineering Corporation Process and system for recycling and reusing gray water
DE69716852D1 (en) 1996-03-21 2002-12-12 Asahi Glass Co Ltd Method and device for producing deionized water
JP3468259B2 (en) 1996-03-22 2003-11-17 栗田工業株式会社 Deionized water production method
JP2887105B2 (en) 1996-04-24 1999-04-26 幸子 林 Method and apparatus for producing drinking water and salt
US5593563A (en) 1996-04-26 1997-01-14 Millipore Corporation Electrodeionization process for purifying a liquid
US5681438A (en) 1996-05-31 1997-10-28 Millipore Corporation Membrane module assembly
RO114874B1 (en) 1996-06-21 1999-08-30 Sc Ind Etans Srl Process for making support boards for filter cells, fluid distribution system of micro- and ultrafiltration filter and mould for manufacturing the same
US6537456B2 (en) 1996-08-12 2003-03-25 Debasish Mukhopadhyay Method and apparatus for high efficiency reverse osmosis operation
US5944999A (en) 1996-09-03 1999-08-31 Nate International Modular filtration system
US5868915A (en) 1996-09-23 1999-02-09 United States Filter Corporation Electrodeionization apparatus and method
JP2000504273A (en) 1996-11-12 2000-04-11 ユナイテッド・ステイツ・フィルター・コーポレーション Electrodeionization apparatus and method
CA2186963C (en) 1996-10-01 1999-03-30 Riad A. Al-Samadi High water recovery membrane purification process
WO1998017590A1 (en) 1996-10-23 1998-04-30 Aquatronics, Inc. Electrodialyzer and process for desalination
JPH10128338A (en) 1996-10-29 1998-05-19 Ebara Corp Method and device for preventing scale from being deposited in electric regeneration type continuous desalting apparatus
US5762774A (en) 1996-12-20 1998-06-09 Glegg Water Conditioning, Inc. Apparatus for the purification of liquids and a method of manufacturing and of operating same
US6123823A (en) 1997-01-17 2000-09-26 Archer Daniels Midland Company Gasket and apparatus for electrodeionization
US5788826A (en) 1997-01-28 1998-08-04 Pionetics Corporation Electrochemically assisted ion exchange
US5925255A (en) 1997-03-01 1999-07-20 Mukhopadhyay; Debasish Method and apparatus for high efficiency reverse osmosis operation
US6080316A (en) 1997-03-03 2000-06-27 Tonelli; Anthony A. High resistivity water production
US6267891B1 (en) 1997-03-03 2001-07-31 Zenon Environmental Inc. High purity water production using ion exchange
US6258278B1 (en) 1997-03-03 2001-07-10 Zenon Environmental, Inc. High purity water production
JPH10277557A (en) 1997-04-10 1998-10-20 Asahi Glass Co Ltd Deionized water making apparatus
US5925240A (en) 1997-05-20 1999-07-20 United States Filter Corporation Water treatment system having dosing control
US5868944A (en) 1997-06-19 1999-02-09 Oxygen8, Inc. Oxygenated water cooler
US6780328B1 (en) 1997-06-20 2004-08-24 Li Zhang Fluid purification devices and methods employing deionization followed by ionization followed by deionization
WO1998058727A1 (en) 1997-06-20 1998-12-30 Ionics, Incorporated Fluid purification devices and methods employing deionization followed by ionization followed by deionization
JPH1142483A (en) 1997-07-28 1999-02-16 Sharp Corp Mineral water regulator
US6146524A (en) 1997-09-15 2000-11-14 Story; Craig W. Multi-stage ozone injection water treatment system
US6508936B1 (en) 1997-10-01 2003-01-21 Saline Water Conversion Corporation Process for desalination of saline water, especially water, having increased product yield and quality
CN1136153C (en) 1997-10-23 2004-01-28 星崎电机株式会社 Electrolyzed water production apparatus
US5971368A (en) 1997-10-29 1999-10-26 Fsi International, Inc. System to increase the quantity of dissolved gas in a liquid and to maintain the increased quantity of dissolved gas in the liquid until utilized
FI103106B1 (en) 1997-11-12 1999-04-30 Amsco Europ Inc Suomen Sivulii Process and apparatus for producing clean water
US6017433A (en) 1997-11-12 2000-01-25 Archer Daniels Midland Company Desalting aqueous streams via filled cell electrodialysis
KR100299139B1 (en) 1997-12-31 2001-06-07 윤종용 Decimation filter and method for the same
GB9802732D0 (en) 1998-02-09 1998-04-08 Elga Ltd Electrodialysis apparatus
US6402917B1 (en) 1998-02-09 2002-06-11 Otv Societe Anonyme Electrodialysis apparatus
US6190528B1 (en) 1998-03-19 2001-02-20 Xiang Li Helical electrodeionization apparatus
US6398965B1 (en) 1998-03-31 2002-06-04 United States Filter Corporation Water treatment system and process
US6207039B1 (en) 1998-04-07 2001-03-27 Sachem, Inc. Process for recovering onium hydroxides or onium salts from solutions containing onium compounds using electrochemical ion exchange
US6190553B1 (en) 1998-12-01 2001-02-20 Sangeul Lee Purification system for disposal of polluted or waste water using water plants
US6099716A (en) 1998-05-26 2000-08-08 Proton Energy Systems, Inc. Electrochemical cell frame
US6171374B1 (en) 1998-05-29 2001-01-09 Ballard Power Systems Inc. Plate and frame fluid exchanging assembly with unitary plates and seals
US7514003B2 (en) 1998-07-06 2009-04-07 Grott Gerald J Methods for producing useful water products with reduced sodium content
US6651383B2 (en) 1998-07-06 2003-11-25 Gerald J. Grott Methods of utilizing waste waters produced by water purification processing
CN1140324C (en) 1998-07-21 2004-03-03 东丽株式会社 Method for inhibiting growth of bacteria or sterilizing around separating membrane
US6056878A (en) 1998-08-03 2000-05-02 E-Cell Corporation Method and apparatus for reducing scaling in electrodeionization systems and for improving efficiency thereof
US6149788A (en) 1998-10-16 2000-11-21 E-Cell Corporation Method and apparatus for preventing scaling in electrodeionization units
JP4363703B2 (en) 1998-10-20 2009-11-11 日東電工株式会社 Fresh water generation method
JP2000126767A (en) 1998-10-21 2000-05-09 Toray Ind Inc Method and apparatus for producing purified water
US6197174B1 (en) * 1998-11-25 2001-03-06 E-Cell Corporation Method and apparatus for electrodeionization of water using mixed bed and single phase ion exchange materials in the diluting compartment
US6315886B1 (en) 1998-12-07 2001-11-13 The Electrosynthesis Company, Inc. Electrolytic apparatus and methods for purification of aqueous solutions
US6428689B1 (en) 1999-01-27 2002-08-06 Sanyo Electric Co., Ltd. Water purifying and dispensing apparatus, and method of purifying chlorine-containing water
US6458257B1 (en) 1999-02-09 2002-10-01 Lynntech International Ltd Microorganism control of point-of-use potable water sources
US6183643B1 (en) 1999-02-24 2001-02-06 Ag Tech International, Inc. Method and apparatus for denitrification of water
US6190558B1 (en) 1999-04-01 2001-02-20 Nimbus Water Systems, Inc. Reverse osmosis purification system
IT1309792B1 (en) 1999-04-22 2002-01-30 Eltek Spa Electric household appliance utilizing water, in particular a macchinadi washing, with improved device for the removal
ES2233368T3 (en) 1999-04-22 2005-06-16 Eltek S.P.A. Appliances appliance that uses water, in special washing machine, with improved device for the elimination of water hardness.
US6482304B1 (en) 1999-05-07 2002-11-19 Otv Societe Anonyme Apparatus and method of recirculating electrodeionization
US6235166B1 (en) 1999-06-08 2001-05-22 E-Cell Corporation Sealing means for electrically driven water purification units
AU5380600A (en) 1999-06-08 2000-12-28 E-Cell Corporation Sealing means for electrically driven water purification units and method of manufacturing thereof
US6254741B1 (en) 1999-08-05 2001-07-03 Stuart Energy Systems Corporation Electrolytic cells of improved fluid sealability
US6379518B1 (en) 1999-08-11 2002-04-30 Kurita Water Industries Ltd. Electrodeionization apparatus and pure water producing apparatus
JP3570304B2 (en) 1999-08-11 2004-09-29 栗田工業株式会社 Sterilization method of deionized water production apparatus and method of producing deionized water
US6495014B1 (en) 2000-08-17 2002-12-17 University Of Chicago Electrodeionization substrate, and device for electrodeionization treatment
US6783682B1 (en) 1999-08-20 2004-08-31 L.E.T., Leading Edge Technologies Limited Salt water desalination process using ion selective membranes
US6214204B1 (en) 1999-08-27 2001-04-10 Corning Incorporated Ion-removal from water using activated carbon electrodes
DE19942347B4 (en) 1999-09-04 2004-07-22 Dechema Gesellschaft Für Chemische Technik Und Biotechnologie E.V. Electrochemically regenerable ion exchanger
US6187162B1 (en) 1999-09-13 2001-02-13 Leon Mir Electrodeionization apparatus with scaling control
US6296751B1 (en) * 1999-09-13 2001-10-02 Leon Mir Electrodeionization apparatus with scaling control
JP2001079553A (en) 1999-09-16 2001-03-27 Kurita Water Ind Ltd Method for packing ion exchanger in electric deionizer, and electric deionizer
US6284399B1 (en) 1999-09-17 2001-09-04 Plug Power Llc Fuel cell system having humidification membranes
JP4197380B2 (en) 1999-09-17 2008-12-17 オルガノ株式会社 Electrodeionization equipment
JP3721883B2 (en) 1999-09-22 2005-11-30 栗田工業株式会社 Electrodeionization equipment
JP3508647B2 (en) 1999-10-07 2004-03-22 栗田工業株式会社 Electrodeionization equipment
JP4110689B2 (en) 1999-10-14 2008-07-02 栗田工業株式会社 Electrodeionization equipment
JP4172117B2 (en) 1999-10-14 2008-10-29 栗田工業株式会社 Electrodeionization equipment
US6258265B1 (en) 1999-10-15 2001-07-10 James Phillip Jones Water purifying apparatus having a plurality of purifying stages and modular ion exchange media containers
JP3593932B2 (en) 1999-10-18 2004-11-24 栗田工業株式会社 High-purity water production apparatus and high-purity water production method
JP3801821B2 (en) 1999-10-29 2006-07-26 株式会社荏原製作所 Electric desalination equipment
US6503957B1 (en) 1999-11-19 2003-01-07 Electropure, Inc. Methods and apparatus for the formation of heterogeneous ion-exchange membranes
EP1106241A1 (en) 1999-12-10 2001-06-13 Asahi Glass Company Ltd. Electro-regenerating type apparatus for producing deionized water
US6627073B2 (en) 1999-12-16 2003-09-30 Sanyo Electric Co, Ltd. Water treatment device
FR2803284B1 (en) 2000-01-03 2002-04-12 Michel Bernard Automatic drinking water purification device
EP1129765A1 (en) 2000-03-02 2001-09-05 Asahi Glass Company Ltd. Method for producing deionized water
US6274019B1 (en) 2000-03-08 2001-08-14 Organo Corporation Electrodeionization apparatus
US6375812B1 (en) 2000-03-13 2002-04-23 Hamilton Sundstrand Corporation Water electrolysis system
US6274020B1 (en) 2000-04-28 2001-08-14 Ernst Schmidt Electrodialysis membrane and gasket stack system
JP2002001070A (en) 2000-06-16 2002-01-08 Asahi Glass Co Ltd Apparatus for electrodialysis
GB0016846D0 (en) 2000-07-10 2000-08-30 United States Filter Corp Electrodeionisation Apparatus
JP3951642B2 (en) 2000-07-13 2007-08-01 栗田工業株式会社 Method for operating electrodeionization apparatus, electrodeionization apparatus and electrodeionization system
US6391178B1 (en) 2000-07-13 2002-05-21 Millipore Corporation Electrodeionization system
KR100465580B1 (en) 2000-07-13 2005-01-13 쿠리타 고교 가부시키가이샤 Electro-deionization device and method for operating the same
AU8331301A (en) 2000-08-11 2002-02-25 Ionics Device and method for electrodialysis
US6645383B1 (en) 2000-08-25 2003-11-11 Usf Consumer & Commercial Watergroup, Inc. Process and apparatus for blending product liquid from different TFC membranes
US20060254919A1 (en) 2001-09-14 2006-11-16 Juzer Jangbarwala Electrophoretic cross-flow filtration and electrodeionization method for treating effluent waste and apparatus for use therewith
US20020144954A1 (en) 2000-09-28 2002-10-10 Arba John W. Electrodeionization device and methods of use
JP4480251B2 (en) 2000-10-19 2010-06-16 エヌジーケイ・フィルテック株式会社 Disinfection of electric regenerative deionized water purifier
US6471853B1 (en) 2000-11-22 2002-10-29 Pti Technologies, Inc. Prognostic health monitoring of fluidic systems using MEMS technology
US20020103724A1 (en) 2000-12-01 2002-08-01 Stephen Huxter Courier independent system and method for the delivery of goods ordered by the internet
FR2818267B1 (en) 2000-12-20 2003-09-26 Gervais Danone Sa Process for depletion in monovalent cations of water intended for supply
JP4597388B2 (en) 2001-01-10 2010-12-15 オルガノ株式会社 Electric deionized water production apparatus and deionized water production method
US6795298B2 (en) 2001-09-07 2004-09-21 Luxon Energy Devices Corporation Fully automatic and energy-efficient deionizer
US6607647B2 (en) 2001-04-25 2003-08-19 United States Filter Corporation Electrodeionization apparatus with expanded conductive mesh electrode and method
US6579445B2 (en) 2001-06-01 2003-06-17 Sartorius Ag System for the production of laboratory grade ultrapure water
JP4507270B2 (en) 2001-06-26 2010-07-21 三浦工業株式会社 Water softening device and regeneration control method thereof
US6607668B2 (en) 2001-08-17 2003-08-19 Technology Ventures, Inc. Water purifier
US6462935B1 (en) 2001-09-07 2002-10-08 Lih-Ren Shiue Replaceable flow-through capacitors for removing charged species from liquids
JP4997678B2 (en) 2001-09-27 2012-08-08 栗田工業株式会社 Electrodeionization equipment
JP2003109642A (en) 2001-09-27 2003-04-11 Kurita Water Ind Ltd Water-treatment device
US7264737B2 (en) 2001-10-05 2007-09-04 Ionics, Incorporated Control of water treatment system with low level boron detection
CN1568220B (en) 2001-10-15 2010-06-09 美国过滤公司 Apparatus for fluid purification and methods of manufacture and use thereof
EP1308201B1 (en) 2001-10-31 2005-01-05 Kurita Water Industries Ltd. Electrodeionization apparatus
DE60234043D1 (en) 2001-11-05 2009-11-26 Bionomics Ltd Device and method for producing water high microbiological purity by means of a reverse osmosis membrane system
AU2002359797B2 (en) 2001-12-20 2008-01-31 Aquatech International Corporation Fractional deionization process
JP2003190820A (en) 2001-12-27 2003-07-08 Ebara Corp Electric demineralizing apparatus
US6905608B2 (en) 2002-01-22 2005-06-14 Exergy Technologies Corporation Advanced electrodeionization for fluid recycling
JP3781361B2 (en) 2002-02-08 2006-05-31 オルガノ株式会社 Electric deionized water production equipment
US20030155243A1 (en) 2002-02-21 2003-08-21 Eet Corporation Multi-path split cell spacer and electrodialysis stack design
US6808608B2 (en) 2002-03-13 2004-10-26 Dionex Corporation Water purifier and method
US6821428B1 (en) 2002-03-28 2004-11-23 Nalco Company Method of monitoring membrane separation processes
US6730227B2 (en) 2002-03-28 2004-05-04 Nalco Company Method of monitoring membrane separation processes
USPP14627P3 (en) 2002-04-02 2004-03-23 The Texas A&M University System Peach tree named ‘TexKing’
US6758954B2 (en) 2002-04-11 2004-07-06 U.S. Filter Corporation Electrodeionization apparatus with resilient endblock
US7144511B2 (en) 2002-05-02 2006-12-05 City Of Long Beach Two stage nanofiltration seawater desalination system
JP3773190B2 (en) 2002-05-15 2006-05-10 オルガノ株式会社 Electric deionized water production equipment
AU2003231488A1 (en) 2002-05-17 2003-12-02 Ebara Corporation Electric demineralizer
AU2003245485A1 (en) 2002-06-12 2003-12-31 The Water System Group, Inc. Purified water supply system
JP3864891B2 (en) 2002-07-01 2007-01-10 栗田工業株式会社 Electric deionizer
JP3794354B2 (en) 2002-07-08 2006-07-05 栗田工業株式会社 Electrodeionization equipment
US7122149B2 (en) 2002-07-12 2006-10-17 Applied Research Associates, Inc. Apparatus and method for continuous depyrogenation and production of sterile water for injection
WO2004013048A2 (en) 2002-08-02 2004-02-12 University Of South Carolina Production of purified water and high value chemicals from salt water
AT486979T (en) 2002-08-02 2010-11-15 Gruenbeck Josef Wasseraufb Method and device for forming erdalkalicarbonate
AU2003272371A1 (en) * 2002-09-12 2004-04-30 Ionics, Incorporated Sparse media edi apparatus and method
US7501061B2 (en) 2002-10-23 2009-03-10 Siemens Water Technologies Holding Corp. Production of water for injection using reverse osmosis
US20040118780A1 (en) 2002-12-20 2004-06-24 Barnstead/Thermolyne Corporation Water purification system and method
WO2004060815A1 (en) * 2002-12-27 2004-07-22 Ebara Corporation Electric demineralizer
EP1624951A1 (en) 2003-02-06 2006-02-15 Zhejiang Omex Environmental Engineering Ltd. Serviceable electrodeionization apparatus and method for resin refill
KR101066939B1 (en) 2003-02-14 2011-09-23 쿠리타 고교 가부시키가이샤 Electric deionization apparatus and method of operating the same
US20050016922A1 (en) 2003-03-24 2005-01-27 Enzweiler Ronald J. Preferential precipitation membrane system and method
US6929748B2 (en) 2003-03-28 2005-08-16 Chemitreat Pte Ltd Apparatus and method for continuous electrodeionization
JP4384444B2 (en) 2003-05-29 2009-12-16 株式会社荏原製作所 Electric demineralizer and electrodialyzer
JP4363587B2 (en) 2003-06-09 2009-11-11 オルガノ株式会社 Operation method of electric deionized water production apparatus and electric deionized water production apparatus
JP2005007348A (en) 2003-06-20 2005-01-13 Matsushita Electric Ind Co Ltd Electric deionizer
JP2005007347A (en) 2003-06-20 2005-01-13 Matsushita Electric Ind Co Ltd Electrodialysis type water purifier
KR101034763B1 (en) 2003-06-23 2011-05-17 바텐팔 에이 비 Boron separation and recovery
GB2403166B (en) 2003-06-25 2006-11-01 Ipsolutions Electrodeionisation process
US7306709B2 (en) 2004-10-20 2007-12-11 Ge Osmonics, Inc. Spiral electrodeionization device with flow distribution profiling
ES2413390T3 (en) 2003-10-20 2013-07-16 Ionics, Incorporated Spiral electrodeionization device and its components
JP4885725B2 (en) 2003-10-27 2012-02-29 ジーイー・アイオニクス・インコーポレイテッド Improved electrodialysis system and process
US7338595B2 (en) 2003-11-13 2008-03-04 Culligan International Company Flow-through tank for water treatment
US8377279B2 (en) 2003-11-13 2013-02-19 Siemens Industry, Inc. Water treatment system and method
US7862700B2 (en) 2003-11-13 2011-01-04 Siemens Water Technologies Holding Corp. Water treatment system and method
US7846340B2 (en) 2003-11-13 2010-12-07 Siemens Water Technologies Corp. Water treatment system and method
US7604725B2 (en) 2003-11-13 2009-10-20 Siemens Water Technologies Holding Corp. Water treatment system and method
US20050103717A1 (en) 2003-11-13 2005-05-19 United States Filter Corporation Water treatment system and method
US7582198B2 (en) 2003-11-13 2009-09-01 Siemens Water Technologies Holding Corp. Water treatment system and method
US7563351B2 (en) 2003-11-13 2009-07-21 Siemens Water Technologies Holding Corp. Water treatment system and method
JP4400218B2 (en) 2004-01-09 2010-01-20 栗田工業株式会社 Electric deionization apparatus and deionization method
DE102005008506A1 (en) 2004-03-16 2005-10-20 Bsh Bosch Siemens Hausgeraete Process for the electrochemical softening of water in a water-conducting domestic appliance
US7306724B2 (en) 2004-04-23 2007-12-11 Water Standard Co., Llc Wastewater treatment
ZA200608313B (en) 2004-05-05 2008-07-30 Unilever Plc Cleaning method
US7470366B2 (en) 2004-05-07 2008-12-30 Ge Mobile Water, Inc. Water purification system and method using reverse osmosis reject stream in an electrodeionization unit
US7329358B2 (en) 2004-05-27 2008-02-12 Siemens Water Technologies Holding Corp. Water treatment process
US20060042957A1 (en) 2004-08-27 2006-03-02 Chunzhi He Ion removal from particulate material using electrodeionization process and devices therefor
US20060091077A1 (en) 2004-10-29 2006-05-04 Ecolochem, Inc. Concentrate recycle loop with filtration module
RU2281255C1 (en) 2004-12-21 2006-08-10 Открытое акционерное общество "Научно-исследовательский и конструкторский институт химического машиностроения" Method of treatment of brackish water including water of high hardness and plant for realization of this method
US7501064B2 (en) 2005-01-06 2009-03-10 Eet Integrated electro-pressure membrane deionization system
US20060231406A1 (en) 2005-04-13 2006-10-19 Usfilter Corporation Regeneration of adsorption media within electrical purification apparatuses
US7658828B2 (en) 2005-04-13 2010-02-09 Siemens Water Technologies Holding Corp. Regeneration of adsorption media within electrical purification apparatuses
US7892848B2 (en) 2005-04-14 2011-02-22 Trovion Singapore Pte. Ltd., Co. Method of ion chromatography wherein a specialized electrodeionization apparatus is used
US8045849B2 (en) 2005-06-01 2011-10-25 Siemens Industry, Inc. Water treatment system and process
DE102005043028A1 (en) 2005-09-09 2007-03-29 BSH Bosch und Siemens Hausgeräte GmbH Process for the electrochemical softening of water in a water-conducting domestic appliance
US7427342B2 (en) 2006-06-02 2008-09-23 General Electric Company Method and apparatus for shifting current distribution in electrodeionization systems
SG174797A1 (en) 2006-06-13 2011-10-28 Siemens Water Tech Corp Method and system for irrigation
US8114259B2 (en) 2006-06-13 2012-02-14 Siemens Industry, Inc. Method and system for providing potable water
US8277627B2 (en) 2006-06-13 2012-10-02 Siemens Industry, Inc. Method and system for irrigation
US20080067069A1 (en) 2006-06-22 2008-03-20 Siemens Water Technologies Corp. Low scale potential water treatment
US7820024B2 (en) 2006-06-23 2010-10-26 Siemens Water Technologies Corp. Electrically-driven separation apparatus
US7744760B2 (en) 2006-09-20 2010-06-29 Siemens Water Technologies Corp. Method and apparatus for desalination
US8066860B2 (en) 2006-09-22 2011-11-29 General Electric Company Arrangement of ion exchange material within an electrodeionization apparatus

Patent Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2794776A (en) * 1954-03-16 1957-06-04 Robert E Briggs Water purification process
US3291713A (en) * 1964-05-27 1966-12-13 Ionics Removal of weakly basic substances from solution by electrodeionization
US3686089A (en) * 1967-07-25 1972-08-22 Emmanuel Korngold Method of separation of ions from a solution
US5116509A (en) * 1989-09-08 1992-05-26 Millipore Corporation Electrodeionization and ultraviolet light treatment method for purifying water
US5286354A (en) * 1992-11-30 1994-02-15 Sachem, Inc. Method for preparing organic and inorganic hydroxides and alkoxides by electrolysis
US6284124B1 (en) * 1999-01-29 2001-09-04 United States Filter Corporation Electrodeionization apparatus and method
US6344122B1 (en) * 1999-07-13 2002-02-05 Kurita Water Industries Ltd. Electrodeionization apparatus
US20020139676A1 (en) * 2000-05-10 2002-10-03 Jacques Moulin Electrodeionization module
US6365023B1 (en) * 2000-06-22 2002-04-02 Millipore Corporation Electrodeionization process
US7147785B2 (en) * 2000-09-28 2006-12-12 Usfilter Corporation Electrodeionization device and methods of use
US6733646B2 (en) * 2001-01-05 2004-05-11 Kurita Water Industries Ltd. Method and apparatus for electrodeionization of water
US6649037B2 (en) * 2001-05-29 2003-11-18 United States Filter Corporation Electrodeionization apparatus and method
US20020189951A1 (en) * 2001-05-29 2002-12-19 Li-Shiang Liang Electrodeionization apparatus and method
US20060037862A1 (en) * 2002-11-15 2006-02-23 Masayuki Miwa Electrodeionization apparatus
US20040206627A1 (en) * 2003-04-11 2004-10-21 Bejtlich Chester L. Electrodeionization device
US20050103722A1 (en) * 2003-11-13 2005-05-19 United States Filter Corporation Water treatment system and method
US20060060532A1 (en) * 2004-09-13 2006-03-23 The University Of South Carolina Water desalination process and apparatus
US20060231403A1 (en) * 2005-04-14 2006-10-19 Riviello John M Chambered electrodeionization apparatus with uniform current density, and method of use

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7658828B2 (en) 2005-04-13 2010-02-09 Siemens Water Technologies Holding Corp. Regeneration of adsorption media within electrical purification apparatuses
US9023185B2 (en) 2006-06-22 2015-05-05 Evoqua Water Technologies Llc Low scale potential water treatment
US9586842B2 (en) 2006-06-22 2017-03-07 Evoqua Water Technologies Llc Low scale potential water treatment
US20110042214A1 (en) * 2006-10-18 2011-02-24 Rath David F Electroregeneration apparatus and water treatment method
US8337686B2 (en) 2006-10-18 2012-12-25 Kinetico Incorporated Electroregeneration apparatus and water treatment method
US9637400B2 (en) 2007-11-30 2017-05-02 Evoqua Water Technologies Llc Systems and methods for water treatment
US9011660B2 (en) 2007-11-30 2015-04-21 Evoqua Water Technologies Llc Systems and methods for water treatment
US20110131994A1 (en) * 2009-12-04 2011-06-09 General Electric Company Economical and Sustainable Disposal of Zero Liquid Discharge Salt Byproduct
US8695343B2 (en) 2009-12-04 2014-04-15 General Electric Company Economical and sustainable disposal of zero liquid discharge salt byproduct
US8871073B2 (en) 2010-06-03 2014-10-28 Organo Corporation Electrodeionization apparatus for producing deionized water
US9339765B2 (en) 2011-09-16 2016-05-17 General Electric Company Electrodialysis method and apparatus for passivating scaling species
US9724645B2 (en) 2012-02-02 2017-08-08 Tangent Company Llc Electrochemically regenerated water deionization

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US20160115046A1 (en) 2016-04-28
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