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WO1999039810A1 - Appareil d'electrodialyse - Google Patents

Appareil d'electrodialyse Download PDF

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Publication number
WO1999039810A1
WO1999039810A1 PCT/US1999/002552 US9902552W WO9939810A1 WO 1999039810 A1 WO1999039810 A1 WO 1999039810A1 US 9902552 W US9902552 W US 9902552W WO 9939810 A1 WO9939810 A1 WO 9939810A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
anode
cathode
desalting
chamber
Prior art date
Application number
PCT/US1999/002552
Other languages
English (en)
Inventor
Nigel Emery
Roger Woodward
Paul Whitehead
Original Assignee
United States Filter Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by United States Filter Corporation filed Critical United States Filter Corporation
Priority to US09/601,406 priority Critical patent/US6402917B1/en
Priority to DE19982837T priority patent/DE19982837B4/de
Priority to GB0018425A priority patent/GB2349648B/en
Publication of WO1999039810A1 publication Critical patent/WO1999039810A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
    • C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
    • C02F1/4695—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis electrodeionisation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/4604—Treatment of water, waste water, or sewage by electrochemical methods for desalination of seawater or brackish water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
    • C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/46—Apparatus for electrochemical processes
    • C02F2201/461—Electrolysis apparatus
    • C02F2201/46105—Details relating to the electrolytic devices
    • C02F2201/4611—Fluid flow
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/46—Apparatus for electrochemical processes
    • C02F2201/461—Electrolysis apparatus
    • C02F2201/46105—Details relating to the electrolytic devices
    • C02F2201/46115—Electrolytic cell with membranes or diaphragms

Definitions

  • the present invention relates to an electrodialysis apparatus for purifying water and also embraces a
  • electrodialysis comprises passing a desalting stream of
  • Electrodialysis in which an ion exchange resin bed is used in the water to be 4 purified is known as electrodeionisation.
  • US-A-3645884 discloses a five compartment electrodeionisation cell comprising outer 7 anode and cathode compartments and a central concentrating compartment.
  • a 8 desalting compartment is positioned between each electrode compartment and the central 9 concentrating compartment.
  • the 0 desalting compartment nearest the anode is separated from the anode chamber and from the central 1 concentrating compartment by two, respective cation selective membranes.
  • the desalting 2 compartment nearest the cathode is separated from the cathode chamber and from the concentrating 3 compartment by two, respective anion selective membranes.
  • water to be purified is passed through the two desalting compartments in succession, and 6 a voltage is applied across the anode and cathode, such that cations are caused to migrate from the 7 water to be purified in the desalting compartment nearest the anode into the central concentrating 8 compartment, and anions are caused to migrate from the water to be purified in the desalting 9 compartment nearest the cathode into the concentrating compartment.
  • Each of "the desalting o compartments comprises a porous bed of ion exchange material.
  • the anode compartment is filled with a weakly acidic sokrti ⁇ n, whilst the 2
  • cathode department is filled with a weakly alkaline solution.
  • hydronium ions from the anode compartment are caused or allowed to pass into the adjacent desalting compartment to assist in driving out the cation impurities in the water to be purified.
  • hydroxide ions in -the cathode compartment are caused or allowed in use to pass into the juxtaposed desalting compartment to assist in driving out the anion impurities from the desalting stream into the central concentrating
  • an electrodialysis 1 apparatus for purifying water which apparatus comprises means defining an anode chamber, means 2 defining a cathode chamber, an anode means disposed within the anode chamber, a cathode means 3 disposed within said cathode chamber, means defining a desalting stream flow path between said anode 4 and said cathode means, means defining a concentrating stream flow path adjacent said desalting 5 stream flow path, means for causing or allowing water to be purified to flow within the desalting 6 stream flow path and means for causing or allowing a fluid adapted to receive ionic impurities from the 7 water to be purified to flow within the concentrating stream flow path; wherein said desalting
  • anode and cathode chambers contains a porous bed of ion exchange material.
  • the cathode chamber may contain anion exchange resin. Said anode chamber
  • a method of electrodialysis comprising o causing or allowing water to be purified to flow in the desalting stream flow path of an electrodialysis 1 apparatus in accordance with the present invention, causing or allowing a fluid adapted to receive ionic 2 impurities from said water to be purified to flow within the concentrating stream path and applying a 3 voltage across the anode means and cathode means.
  • substantially pure water may be caused or allowed to flow in the anode -and/or 6 cathode chamber, and preferably substantially pure water is used in both the anode chamber and the 7 cathode chamber.
  • substantially pure water water having a resistivity of at least 1M ⁇ - 8 cm, preferably at least 15M ⁇ -cm. 9 0 It has been found that the electrodialysis apparatus of the present invention can be used to produce 1 high purity water, that is water having a resistivity of at least 15M ⁇ -cm. 2 3
  • the substantially pure water used within the anode and/or cathode chamber may be 4 water that has been purified using the apparatus of the invention.
  • means may be provided 5 for supplying water that has been purified in the desalting stream flow path to the anode and/or 6 cathode chamber.
  • the water used in one or both of the 7 electrode chamber may be recycled through a secondary purifier, e.g. a second electrodialysis or 8 electrodeionisation device.
  • a secondary purifier e.g. a second electrodialysis or 8 electrodeionisation device.
  • the fluid supplied to the concentrating stream flow path is also substantially pure water, and 1 in some embodiments means may be provided for supplying substantially pure water that has been 2 purified within the desalting stream flow path to the concentrating stream flow path.
  • the 4 l invention also embraces the use of water of lower quality in the concentrating stream flow path.
  • the electrodialysis apparatus of the present invention does not require the addition of acid or alkali to
  • water that has been purified within the desalting stream may be caused or o allowed to flow in parallel through the concentrating stream and at least one of the anode and cathode 1 chambers.
  • the substantially pure water may be caused or allowed to flow successively 2 through at least one of the anode and cathode chambers and then through the concentrating stream 3 flow path.
  • the fluid within the concentrating stream is caused or allowed to flow counter- 4 current to the flow of water to be purified in at least one of the first and second portions of the 5 desalting streams flow paths.
  • the water within at least one of the anode and cathode 6 chambers is caused or allowed to flow counter-current to the flow of water to be purified in at least 7 one of said first and second portions.
  • Said concentrating stream flow path may contain a porous bed of ion exchange material. 0 1 Usually the desalting stream flow path will contain a porous bed of ion exchange material.
  • Said first 2 portion may contain cation exchange resin, and said second portion may contain anion exchange resin.
  • the water to be purified may be passed through the first and second portions of the desalting stream 5 flow path in any order, although preferably the water to be purified is passed through the first portion 6 first, followed by the second portion.
  • the water to be purified is acidified in the first 7 portion by the presence of hydronium ions generated by water splitting at the anode.
  • the water to be 8 purified is thus slightly acidic when it enters the second portion which contains hydroxide ions 9 produced at the cathode.
  • This arrangement will assist 0 in reducing the build-up of scale in the apparatus. 1 2 It is envisaged that in some embodiments the water to be purified may be passed in succession through 5 l two or more electrodeionisation apparatus according to the present invention.
  • the polyelectrodialysis apparatus may be shared by both electrodialysis apparatus.
  • the polyelectrodialysis apparatus may be shared by both electrodialysis apparatus.
  • the polyelectrodialysis apparatus may be shared by both electrodialysis apparatus.
  • the water to be purified passes through two electrodialysis apparatus in accordance with the 0 present invention, it is preferred that the water to be purified passes successively through the first and 1 second portions of the first electrodialysis apparatus, and then through the second and first portions in 2 succession of the second electrodialysis apparatus, so that the water to be purified is given a final 3 polish by passage through a cation exchange resin bed.
  • 4 5 Following is a description by way of example only with reference to the accompanying diawings of 6 embodiments of the present invention.
  • Figure 1 is a flow diagram of a first electrodialysis apparatus in accordance with the present 1 invention
  • 2 Figure 2 is a flow diagram of a second electrodialysis apparatus in accordance with the present 3 invention
  • 4 Figure 3 is another flow diagram of a third electrodialysis apparatus in accordance with the 5 present invention
  • 6 Figure 4 is a flow diagram of a first polyelectrodialysis apparatus in accordance with the 7 present invention
  • 8 Figure 5 is a flow diagram of a second polyelectrodialysis apparatus in accordance with the 9 present invention.
  • a first electrodialysis apparatus 10 in accordance with the present invention 2 comprises an anode 14 and a cathode 16 that is spaced from the anode.
  • Said anode which may be a 6 platinum coated anode, is accommodated within an anode compartment 24 and said cathode 16 is accommodated within a cathode compartment 26.
  • the apparatus 10 comprises three further compartments, namely a first desalting compartment 36 adjacent the anode compartment 24, a second desalting compartment 46 adjacent the cathode compartment 26 and a concentrating compartment 28 interposed between said first and second desalting compartments 36, 46.
  • Said anode compartment 24 is partitioned from the first desalting compartment 36 by a first cation perm-selective membrane 32 and said first desalting compartment 36 is partitioned -from the concentrating compartment 28 by a second cation perm-selective membrane 34.
  • said cathode compartment 26 is partitioned from the second desalting compartment 46 by a first anion perm-selective membrane 42, and said second desalting compartment 46 is partitioned from the concentrating compartment 28 by a second anion perm-selective membrane 44.
  • electrodialysis apparatus of this kind will be generally well known to those skilled in the art and has been described inter alia in numerous prior patent specifications (see, e.g. GB-A- 769307, EP-A-0078842, EP-A-0170895). It is envisaged that said apparatus will conveniently comprise a stack of juxtaposed compartment-forming elements of predetermined thickness with said ion selective membranes 32, 34, 42, 44 interposing between neighbouring elements. Said electrodes 14, 16 will be formed as thin plates or screens and each will be interposed between an electrode compartment-forming element and an adjacent end plate.
  • Each compartment-forming element may be manufactured from a thermoplastic material and will be formed with a large, central opening that extends through the element and forms a compartment, with the body of the element defining the outer perimeter of the compartment.
  • the elements may iurther be drilled or moulded with one or more through-bores around the central opening. In the assembled stack these bores will align with corresponding bores in the juxtaposed elements to form ports for conveying fluids between compartments interiorly of the stack.
  • the ends of each compartment will be closed in the assembled stack by the neighbouring membranes.
  • An end plate will be provided at each end of the stack, and the assembly will be held together by such means as a plurality of bolts that extend between the end plates, through aligning apertures formed in all of the elements.
  • compartments 36, 46 in the electrode-electrode direction may be in the range 5 to 40mm, and the thickness of the electrode and concentrating compartments 24, 26, 28 may be in the region of 2 to
  • the anode compartment 24 of the apparatus of Figure 1 contains a porous bed of cation exchange 1 resin 25, and the cathode compartment 26 contains a porous bed of anion exchange resin 27.
  • cation exchange resin may be used any suitable resin known to those skilled in the art such as, for 3 example, that which is commercially available from Dow Liquid Separations under the trade mark 4 DOWEX MARATHON C.
  • Said anion exchange resin may similarly be any suitable resin known to 5 those skilled in the art such, for example, a DOWEX MARATHON A. 6 7
  • Said first desalting compartment 36 also contains a porous bed of cation exchange resin 37 and said 8 second desalting compartment 46 contains a porous bed of anion exchange resin 47.
  • Said 9 concentrating compartment 28 also contains a porous bed of ion exchange resin 29 which may be o cation exchange resin, anion exchange resin or a mixture of both of these.
  • ion exchange resin 29 which may be o cation exchange resin, anion exchange resin or a mixture of both of these.
  • Each of the compartments 24, 26, 28, 36, 46 is provided with an inlet and an outlet. In use the inlet to 3 the first desalting compartment 36 is connected to a supply 50 of water to be purified. 4 5 Internal porting (not shown) may be included to connect the outlet of the first desalting chamber 36 to 6 the inlet of the second desalting chamber 46, and the inlets/outlets of the desalting chambers 36, 46 7 may be arranged such that the water to be purified flows in the same direction through both desalting 8 chambers as shown in Figure 1.
  • Substantially pure water that is water having a purity of at least lM ⁇ -cm is supplied to each of the 1 electrode chambers 24, 26 and may also be supplied to the concentrating chamber 28 to provide 2 respectively electrode chamber streams 52, 54 and a concentrating, flushing stream 56. 8
  • an operating voltage of 2 to 100N is applied across the anode 14 and cathode 16 sufficient to obtain water splitting at the electrodes.
  • Cations in the water to be purified are taken up on the cation exchange resin 37 in the first desalting chamber 36, being replaced in solution by hydronium ions.
  • Hydronium ions generated at the anode 14 pass via the first cation exchange membrane 32 into the cation resin bed under the influence of the applied electrical potential. As they pass through the cation resin bed, the hydronium ions regenerate the cation exchange resin by being exchanged for cations from the water to be purified 50.
  • the hydronium ions and the impurity cations pass via the second cation exchange membrane 34 into the concentrating chamber 28 from which they cannot proceed further towards the cathode 16 owing to the presence of the second anion selective membrane 44.
  • the cations are thus eluted from the concentrating chamber 28 by the action of the high purity "flushing" stream 56 flowing through the concentrating chamber 28.
  • anions in the water to be purified are carried to the concentrating chamber 28 under the influence of the cathode-generated hydroxide ions and the electrical potential, via the anion exchange resin 47 in the second desalting chamber 46 and the second anion selective membrane 44.
  • the impurity anions are also eluted by the flushing stream 56 within the concentrating chamber 28.
  • the product water 60 is delivered from the outlet of the second desalting chamber 46.
  • FIG. 2 shows a second electrodialysis apparatus in accordance with the invention which is suitable for use on a small scale. Many of the components of the apparatus of Figure 2 are common to the apparatus of Figure 1 and, for these, the identical reference numerals as used in Figure 1 are used. It will be seen that the electrodialysis apparatus of Figure 2 differs from that shown in Figure 1 in that the first desalting chamber 36 is divided by means of internal partitions 52 into two sub-chambers 36a, 36b.
  • the water to be purified 50 is supplied in succession to one of the sub-chambers 36a of the first desalting compartment 36, then to the second desalting compartment 46 and finally to the second sub- chamber 36b of the first desalting compartment 36.
  • the water to be purified 50 is thus passed in succession through a cation exchange resin bed, an anion exchange resin bed and finally a cation exchange resin bed which gives the water to be purified a final, polishing treatment.
  • a portion of the product water 60 is supplied in parallel to the electrode 9
  • 5 compartments 24, 26 and the concentrating compartment 28 are each about 5mm.
  • FIG. 3 A third electrodialysis apparatus in accordance with the present invention is illustrated in Figure 3.
  • the 7 construction of the third electrodialysis apparatus is similar to that of the second electrodialysis 8 apparatus illustrated in Figure 2, and accordingly the same reference numerals will be used for like 9 parts as before.
  • each electrodialysis apparatus 10, 10' of the polyelectrodialysis 1 apparatus of Figure 4 that are the same as or similar to the components of the electrodialysis apparatus 2 of Figure 1 are indicated by the same reference numerals as used in Figure 1 , with the prime tjeingTjsed 10 to indicate components of the second electrodialysis apparatus 10'.
  • the water to be purified 50 is supplied firstly to the first desalting chamber 36 of the first electrodialysis apparatus 10 and then, through internal porting (not shown), to the second desalting chamber 46 of the first electrodialysis apparatus 10.
  • the outlet 50' of the second desalting chamber 46 of the first electrodialysis apparatus 10 is connected to the second desalting chamber 46' of the second electrodialysis apparatus 10', and internal porting (not shown) within the second electrodialysis apparatus 10' is provided to supply the feed from the second desalting chamber 46' to the first desalting chamber 36'.
  • the water to be purified 50 is thus passed successively through a cation exchange resin bed 36, a first anion exchange resin bed 46, a second anion exchange resin bed 46' and finally a second cation exchange resin bed 36' for polishing.
  • the product water 60 is delivered from the outlet of the first desalting chamber 36' of the second electrodialysis apparatus 10'.
  • the electrode streams 52, 54, 52', 54' and the concentrating streams 56, 56' are supplied firstly to the second electrodialysis apparatus 10' and subsequently to the first apparatus 10. This assists in reducing the back difliision of impurity ions from the electrode/concentrating streams into the desalting stream.
  • the electrode streams 52, 54 exiting the first electrodialysis apparatus 10 are combined to provide an input stream 71 to a secondary purifier 70.
  • Said secondary purifier 70 may be any suitable water purifier known to those skilled in the art, although a further electrodialysis apparatus or polyelectrodialysis apparatus in accordance with the present invention is preferred.
  • Said secondary purifier 70 has an output stream 72 which is used to feed the electrode streams 52', 54' of the second electrodialysis apparatus 10'.
  • each of the desalting chambers 36, 46, 36', 46' has a thickness in the electrode-electrode direction of about 15mm, and each of the electrode and concentrating chambers 24, 26, 28, 24', 26', 28' has a thickness of about 15mm.
  • a second polyelectrodialysis apparatus is illustrated in Figure 5.
  • This second apparatus comprises two juxtaposed electrodialysis apparatus of the kind hereinbefore described with reference to Figure 1.
  • the second polyelectrodialysis apparatus differs from that illustrated in Figure 4 in that the two electrodialysis apparatus constituting the polyelectrodialysis apparatus are formed as a single stack of compartment-forming elements of the kind described above.
  • the electrodialysis apparatus are arranged in the stack back-to-back, so that the cathode chamber 126 of one of the electrodialysis apparatus is disposed juxtaposed the cathode chamber 226 of the other electrodialysis apparatus.
  • a central, water-impervious partition 200 partitions the two electrodialysis apparatus one from the other.
  • Water to be purified 150 is supplied to the first desalting compartment 136 of one of the electrodialysis apparatus, then to the second desalting compartment 146 of the one apparatus.
  • a -feed 160 from the second desalting compartment 146 of the one apparatus is supplied to the second desalting compartment 246 of the other electrodialysis apparatus, and subsequently to the first desalting compartment 236 of the other electrodialysis apparatus.
  • the water to be purified 150 thus passes successively through a first cation exchange resin bed 137, a first anion exchange resin bed 147, a second anion exchange resin bed 247 and a second cation exchange resin bed 237.
  • Substantially pure or pretreated water is supplied as a concentrating, flushing stream 256 to the concentrating compartment 228 of the other electrodialysis apparatus and then to the concentrating compartment 128 of the one electrodialysis apparatus, so that the concentrating stream flows through the polyelectrodialysis apparatus in the opposite direction from the water to be purified 150.
  • a separate electrode rinsing stream 252 of high purity water is supplied to the anode compartment 224 of the other electrodialysis apparatus, and then in parallel to the cathode compartments 126, 226 trf the one and other electrodialysis apparatus. The cathode rinsing streams are then recombined and passed through the anode compartment 124 of the one electrodialysis apparatus.
  • the electrode rinsing stream is passed through the polyelectrodialysis apparatus in the opposite direction to the water to be purified 1 0 ⁇ the desalting stream). In this way, the back diffusion of impurity ions into the desalting stream is reduced.
  • Each of the electrode, concentrating and desalting compartments of the polyelectrodialysis apparatus illustrated in Figure 5 has a thickness in the anode to cathode direction of about 15mm.
  • the second polyelectrodialysis apparatus is operated for over 3500 hours with feed water of 10 to 12 20 ⁇ S/cm, having 25 to 35 ppm dissolved carbon dioxide, at a rate of 1.0 to 1.5 litres per minute, the resistivity of the product water 260 on exiting the stack is found to be in the range 15 to 17.5M ⁇ -cm.
  • the polyelectrodialysis apparatus shown in Figures 4 or 5 may be modified so that the concentrating flushing stream and/or the electrode rinsing streams are fed by a part of the product water which is returned through the apparatus.
  • the central partition 200 of the second polyelectrodialysis apparatus may be omitted, such that the apparatus includes a single, central cathode chamber.
  • Said single cathode chamber may include a single cathode or anode which is shared by the said one and other electrodialysis apparatus.
  • the present invention thus provides an improved electrodialysis apparatus in which water to i>e purified is passed successively through a cation exchange resin bed and an anion exchange resin bed between an anode and a cathode.
  • the anode and cathode are separated from the desalting stream by cation and anion perm-selective membranes respectively, and the cathode and anode compartments are filled with ion exchange resin material.
  • Each of the electrode compartments is supplied with a-feed of substantially pure water, and in use the electrodialysis apparatus of the invention is found to give product water of surprisingly high purity.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electrochemistry (AREA)
  • Analytical Chemistry (AREA)
  • Molecular Biology (AREA)
  • Health & Medical Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Abstract

L'invention concerne un appareil d'électrodialyse permettant de purifier de l'eau. Ledit appareil comprend une chambre d'anode et une chambre de cathode, et est caractérisé en ce que ladite chambre d'anode et ladite chambre de cathode comprennent un lit poreux de matière d'échange ionique. Chacune de ces chambres est parcourue par des directions d'écoulement préférées. Ledit appareil d'électrodialyse ne requiert pas l'ajout d'acide ou d'alcali aux chambres d'électrode et est basé sur le principe de la séparation de l'eau au niveau des électrodes pour générer des ions hydronium et hydroxyde de manière à réapprovisionner en résines d'échange ionique les compartiments d'électrodes et de manière à contribuer à amener les impuretés ioniques depuis les chemins d'écoulement du courant de dessalage jusqu'au courant de concentration. Au moins deux appareils d'électrodialyse pourraient être combinés pour former un appareil de polyélectrodialyse.
PCT/US1999/002552 1998-02-09 1999-02-05 Appareil d'electrodialyse WO1999039810A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US09/601,406 US6402917B1 (en) 1998-02-09 1999-02-05 Electrodialysis apparatus
DE19982837T DE19982837B4 (de) 1998-02-09 1999-02-05 Elektrodialysevorrichtung
GB0018425A GB2349648B (en) 1998-02-09 1999-02-05 Electrodialysis apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9802732.9 1998-02-09
GBGB9802732.9A GB9802732D0 (en) 1998-02-09 1998-02-09 Electrodialysis apparatus

Publications (1)

Publication Number Publication Date
WO1999039810A1 true WO1999039810A1 (fr) 1999-08-12

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PCT/US1999/002552 WO1999039810A1 (fr) 1998-02-09 1999-02-05 Appareil d'electrodialyse

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DE (1) DE19982837B4 (fr)
GB (2) GB9802732D0 (fr)
WO (1) WO1999039810A1 (fr)

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US7083733B2 (en) 2003-11-13 2006-08-01 Usfilter Corporation Water treatment system and method
US7147785B2 (en) 2000-09-28 2006-12-12 Usfilter Corporation Electrodeionization device and methods of use
US7279083B2 (en) 2000-07-10 2007-10-09 Vws (Uk) Ltd Electrodeionisation apparatus
US7329358B2 (en) 2004-05-27 2008-02-12 Siemens Water Technologies Holding Corp. Water treatment process
US7371319B2 (en) 2002-10-23 2008-05-13 Siemens Water Technologies Holding Corp. Production of water for injection using reverse osmosis
WO2007149574A3 (fr) * 2006-06-22 2008-07-03 Siemens Water Tech Corp Traitement d'eau à potentiel à petite échelle
US7563351B2 (en) 2003-11-13 2009-07-21 Siemens Water Technologies Holding Corp. Water treatment system and method
US7572359B2 (en) 2001-10-15 2009-08-11 Siemens Water Technologies Holding Corp. Apparatus for fluid purification and methods of manufacture and use thereof
US7582198B2 (en) 2003-11-13 2009-09-01 Siemens Water Technologies Holding Corp. Water treatment system and method
US7604725B2 (en) 2003-11-13 2009-10-20 Siemens Water Technologies Holding Corp. Water treatment system and method
US7658828B2 (en) 2005-04-13 2010-02-09 Siemens Water Technologies Holding Corp. Regeneration of adsorption media within electrical purification apparatuses
US7820024B2 (en) 2006-06-23 2010-10-26 Siemens Water Technologies Corp. Electrically-driven separation apparatus
US8377279B2 (en) 2003-11-13 2013-02-19 Siemens Industry, Inc. Water treatment system and method
US8585882B2 (en) 2007-11-30 2013-11-19 Siemens 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
US9592472B2 (en) 2006-06-13 2017-03-14 Evoqua Water Technologies Llc Method and system for irrigation
US10252923B2 (en) 2006-06-13 2019-04-09 Evoqua Water Technologies Llc Method and system for water treatment
US10625211B2 (en) 2006-06-13 2020-04-21 Evoqua Water Technologies Llc Method and system for water treatment
US11820689B2 (en) 2017-08-21 2023-11-21 Evoqua Water Technologies Llc Treatment of saline water for agricultural and potable use
US12180103B2 (en) 2017-08-21 2024-12-31 Evoqua Water Technologies Llc Treatment of saline water for agricultural and potable use and for generation of disinfectant solution

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GB2349648A (en) 2000-11-08
GB2349648B (en) 2002-11-13
DE19982837T1 (de) 2001-03-22
GB9802732D0 (en) 1998-04-08
DE19982837B4 (de) 2010-12-30
GB0018425D0 (en) 2000-09-13

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