WO2006089460A1 - Procede de desalinisation electrique et dispositif de desalinisation electrique a enroulement en spirale - Google Patents

Procede de desalinisation electrique et dispositif de desalinisation electrique a enroulement en spirale Download PDF

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Publication number
WO2006089460A1
WO2006089460A1 PCT/CN2005/000238 CN2005000238W WO2006089460A1 WO 2006089460 A1 WO2006089460 A1 WO 2006089460A1 CN 2005000238 W CN2005000238 W CN 2005000238W WO 2006089460 A1 WO2006089460 A1 WO 2006089460A1
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WO
WIPO (PCT)
Prior art keywords
fresh water
water
concentrated water
chamber
outer casing
Prior art date
Application number
PCT/CN2005/000238
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English (en)
Chinese (zh)
Inventor
Guanghui Li
Xinmin Chao
Original Assignee
Zhejiang Omex Environmental Enginering Ltd.
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 Zhejiang Omex Environmental Enginering Ltd. filed Critical Zhejiang Omex Environmental Enginering Ltd.
Priority to PCT/CN2005/000238 priority Critical patent/WO2006089460A1/fr
Publication of WO2006089460A1 publication Critical patent/WO2006089460A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/42—Electrodialysis; Electro-osmosis ; Electro-ultrafiltration; Membrane capacitive deionization
    • B01D61/44—Ion-selective electrodialysis
    • B01D61/46—Apparatus therefor
    • B01D61/463—Apparatus therefor comprising the membrane sequence AC or CA, where C is a cation exchange membrane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/42—Electrodialysis; Electro-osmosis ; Electro-ultrafiltration; Membrane capacitive deionization
    • B01D61/44—Ion-selective electrodialysis
    • B01D61/46—Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/42—Electrodialysis; Electro-osmosis ; Electro-ultrafiltration; Membrane capacitive deionization
    • B01D61/44—Ion-selective electrodialysis
    • B01D61/46—Apparatus therefor
    • B01D61/48—Apparatus therefor having one or more compartments filled with ion-exchange material, e.g. electrodeionisation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/10—Spiral-wound membrane modules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/10—Spiral-wound membrane modules
    • B01D63/101—Spiral winding
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/131—Reverse-osmosis

Definitions

  • the present invention relates to an electric desalter, and more particularly to a method and structure for a spiral coil electric desalter which is designed to be more advantageous for desalination. Background technique
  • EDI electric desalination
  • a typical electric desalination apparatus generally includes positive and negative electrodes, alternating anode and cathode ion exchange membranes between the positive and negative electrodes, and an electrode chamber, a concentrated water chamber and a fresh water chamber separated by a cation membrane. The water to be treated enters the fresh water chamber.
  • the charged ions in the water migrate toward the anode and the cathode, respectively, and the positively charged ions migrate toward the cathode, and enter the concentrated water from the fresh water chamber through the cation exchange membrane. room.
  • the negatively charged ions migrate toward the anode and pass through the anion exchange membrane from the fresh water chamber to the concentrated water chamber.
  • the ions entering the concentrated water chamber will continue to move in the original migration direction, but due to the selective permeation characteristics of the ion exchange membrane, the cation exchange membrane only allows the passage of cations, and the anion exchange membrane only allows the passage of anions, so in concentrated water
  • the ions in the chamber can no longer be returned to the fresh water chamber. This achieves the goal of purifying the water in the fresh water chamber.
  • the order of the various ions in the fresh water is different.
  • the first is High-priced ions are eluted, followed by low-cost, easily eluted ions, and finally weakly ionized ions, hydrogen ions, and hydroxide ions are removed.
  • the current (density) required for the removal of various ions is also different, the current required for the easy removal of ions is low, and the current required for the weak ionization to remove ions is high. Therefore, the preferred component design should be that the current at the freshwater influent is relatively low, while the current at the freshwater effluent is relatively high to facilitate the removal of ions that are difficult to deionize for weak ionization.
  • the water in the fresh water chamber also undergoes a cracking reaction under the action of electric current, especially at the interface of the ion exchange resin and the ion exchange membrane at the outlet end of the EDI component with high purity of water, which is prone to water cracking reaction.
  • the cleavage reaction produces hydrogen ions and hydroxide ions which regenerate the ion exchange resin. Therefore, the EDI technique is a process of continuously regenerating an ion exchange resin without using an acid or a base.
  • the electric desalination module has a plate-and-frame design and a roll-type design, wherein the roll-type EDI component has a concentric roll type and a spiral roll type.
  • the water flow in the fresh water and concentrated water chambers is generally co-directional or concurrent (as shown in Figure 1).
  • 1 is a concentrated water chamber
  • 2 is a fresh water chamber
  • 3 and 4 are polar water chambers, respectively.
  • 5 is concentrated water into the water
  • 6 is fresh water into the water.
  • 7 is the positive electrode
  • 8 is the negative electrode.
  • 9 and 10 are polar water inflows, respectively.
  • 11 is a cation exchange membrane
  • 12 is an anion exchange membrane.
  • 13 is concentrated water
  • 14 is fresh water
  • 15 and 16 are polar water.
  • An ion exchange material such as an ion exchange resin is added to the module fresh water chamber, and the concentrated water chamber and the polar water chamber are filled with an ion exchange material such as an ion exchange resin or an inert support grid.
  • Ca ++ and Mg ++ migrate from the fresh water chamber through the cation exchange membrane 11 to the concentrated water chamber 1, as shown in Figure 1, this migration occurs at the inlet end of the assembly, When they enter the concentrated water chamber, they will continue to move toward the cathode under the action of current, and at the same time they will move toward the outlet end of the assembly with the flow of water.
  • Ca ++ and Mg ++ reach the anion exchange membrane 12, they cannot pass back to the fresh water chamber 2 through the anion exchange membrane 12, and as a result they will flow out of the assembly with concentrated water.
  • the side of the anion exchange membrane concentrated water chamber is close to the outlet end of the module, and the Ca ++ and Mg ++ ions blocked by the anion exchange membrane will be combined with hydroxide, bicarbonate and carbonate. Combined, precipitation precipitates are produced.
  • the concentrated water circulation operation process is generally adopted, With the operation of the device, the concentration of Ca ++ and Mg ++ in the concentrated water is getting higher and higher, which further aggravates the severity of scaling. Scaling will not only affect the normal operation of the ion exchange membrane, but also increase the resistance of concentrated water flow and reduce the flow of concentrated water. After the flow rate is reduced, the hardness is lowered due to the decrease in the water flow rate. Ions such as Ca ++ and Mg ++ do not flow out of the concentrated water chamber in time, which also exacerbates fouling. As a result, a vicious cycle is formed, which affects the desalination performance and service life of the components, resulting in a decrease in water production capacity.
  • the fresh water flow path is in the same direction as the central concentrated water distribution pipe, and the concentrated water flow path is spirally extended from the central concentrated water distribution pipe to the module outer casing.
  • the utility model has the advantages of simple structure, reasonable sealing method of components, high use pressure, and replacement of ion exchange resin.
  • the respective flow paths of the fresh water flow path are spiral in a section perpendicular to the axial direction of the module.
  • the current density is different at each position in the section perpendicular to the axial direction of the component, and the current density is calculated as follows:
  • the current density near the central tube of the component is high, while the current density is low near the component housing.
  • the current density at each point of the freshwater flow is different in the cross section perpendicular to the flow direction of the fresh water, the current density is high near the central tube of the assembly, and the current density is low near the outer casing of the module.
  • the desalination ability of fresh water is the weakest near the outer shell of the module. The closer to the central tube of the module, the stronger the desalination ability of fresh water, which makes it possible in all parts of the device. Fresh water quality has produced differences.
  • the influent and effluent of fresh water and concentrated water are completed by the influent distribution pipe and the water collecting pipe.
  • the structure Due to structural limitations, especially the limitation of the central pipe, the structure generally has only one pair of fresh water.
  • the concentrated water chamber that is, only one anion-cation exchange membrane bag is rotated to the bottom, so that only the axial length can be increased to ensure the water production of the device, so that the water production of the module is limited, or the pressure of fresh water and concentrated water is lowered. high.
  • the ion exchange resin of the fresh water chamber cannot be replaced, so that the use range is limited and the operation cost is increased.
  • the assembly is complex in manufacturing process and difficult to maintain and replace parts, so the assembly is costly to manufacture.
  • the present invention mainly provides a spiral wound electric desalter with a reasonable structure, good desalination ability of components, and reduced possibility of scale formation; and solves the uneven distribution of current density existing in the prior art, producing water Technical problems with low quality and easy scaling of components.
  • the electric desalination method of the spiral coil type electric desalter is to use the flow direction of concentrated water and fresh water to be interlaced, the concentrated water flows axially, and the fresh water spirals in a radial direction.
  • the corresponding spiral coil electric desalter of the present invention has the following structures: a central tube as a pole of the electrode and a concentric outer casing, and the other pole of the outer casing provided with electrodes, which are arranged alternately around the central tube a plurality of anion-cation exchange membranes, the space between the central tube and the outer casing is divided into a concentrated water chamber and a fresh water chamber by an anion-cation exchange membrane, the fresh water chamber is filled with an ion exchange resin, and a pair of anion-cation exchange membranes form a membrane pocket to the central tube
  • the anion-cation exchange membrane is wound into a core for the axial center, and the membrane bag formed by the anion-cation exchange membrane is open at opposite ends, the fresh water inlet is disposed on the outer casing, and the water outlet is disposed on the central tube.
  • the current density received is also increasing, and the current required to remove the ions in the fresh water is also increasing.
  • the fresh water needs to be removed.
  • the ions are mainly weakly ionized, difficult to remove anions, such as bicarbonate ions, carbonate ions and organosilicon ions, etc., to remove the high currents required by these ions, and the current density there is also The highest value has been reached, which meets the requirements for the removal of difficult ions.
  • the flow of fresh water from the outside to the inside increases the current acting on fresh water from low to high, which just meets the current requirements for the removal of ions, thereby enhancing the desalination capacity of the components and improving the components. Electrical efficiency optimizes component performance and energy consumption.
  • Fresh water is the flow direction of the radial spiral, and concentrated water is the axial flow direction.
  • the two water flows form a cross form, which reduces the hydroxide and bicarbonate at the water outlet of the Ca ++ and Mg ++ ions and the concentrated water chamber.
  • the film bag is open in the radial direction, closed in the axial direction, the outside of the film bag is a concentrated water chamber, the inside of the film bag is a fresh water chamber, and the opening of the film bag is divided into several, the central tube is hollow
  • the integrated straight pipe has a plurality of openings corresponding to the central pipe, and the opening is connected to the fresh water flow channel unit.
  • the opening of the film bag is open between the two ends of the film bag, and the openings of the plurality of film bags near the outer casing end are joined together to be connected with the fresh water inlet of the outer casing.
  • the central pipe is sleeved with a water distribution plate, and the water distribution plate is provided with a hollow support plate; the inner side of the support plate is provided with a fresh water inlet at a position opposite to the opening of one end of the film bag, and the outer side of the support plate
  • the outer casing is provided with a concentrated water inlet, and the concentrated water outlet is disposed at the other end of the outer casing axial direction.
  • the film bag is open in the axial direction, closed in the radial direction, the fresh water chamber is outside the film bag, and the concentrated water chamber is in the film bag, the central pipe has a concentrated water inlet at one end and fresh water at one end. The nozzle is closed on the side of the central water inlet of the concentrated water.
  • a concentrated water distribution device is arranged at the concentrated water inlet of the central pipe, and the concentrated water distribution device is provided with a plurality of concentrated water distribution holes in the circumferential direction of the concentrated water inlet of the central pipe,
  • the water cloth water hole is connected with a cloth water passage
  • the cloth water passage is provided with a plurality of through holes
  • the cloth water passage is connected with a cloth water chamber
  • the cloth water chamber is provided with a water distribution board and a baffle plate on both sides, the cloth water board is close to On the side of the film bag, the water distribution plate and the baffle plate are sleeved on the center tube.
  • the barrier plate is provided with a fresh water inlet passage, and the fresh water inlet passage is connected to the circumferential freshwater inlet of the outer casing side.
  • the fresh water chamber is provided with a sealing strip in the axial direction, and a filling hole is arranged thereon, and a sealing plug is connected to the filling hole.
  • the outer casing is provided with a water outlet.
  • the present invention has the actual desalination condition when the raw water flows through various sections of the electric desalter, and fully utilizes the characteristics of different current density inside and outside the electric desalter, so that the requirements of current and ion removal are consistent, and the structure is reasonable.
  • the arrangement is scientific, the water flow resistance is small, and the deep desalination of the raw water is realized, especially the removal of the weak electrolyte is greatly improved, the quality of the produced water is improved, and the use efficiency of the electric energy is improved.
  • Figure 1 is a schematic view of the flow direction of a parallel flow of a coiled electric desalter.
  • Fig. 2 is a general view of a fresh water chamber in a film bag of a spiral wound electric desalter according to the present invention.
  • Figure 3 is a cross-sectional view of a thick water passage of a spiral wound electric desalter of the present invention.
  • Fig. 4 is a general view of a concentrated water chamber in a film bag of a spiral wound electric desalter according to the present invention.
  • Fig. 5 is a schematic view showing the structure of a concentrated water distribution device in a membrane bag of a spiral wound electric desalter according to the present invention.
  • Fig. 6 is a schematic view showing the sealing of the fresh water chamber of the concentrated water chamber in the membrane bag of the spiral wound electric desalter of the present invention. Best way to implement the invention
  • Embodiment 1 As shown in FIG. 2, the spiral coil type electric desalter is centered on the center tube 17, the center tube 17 is an engineering plastic tube, and the surface is coated with a titanium-coated thin plate as a cathode of the electrode, and the outer casing 18 As the anode electrode, the two electrodes are provided with a DC power source; a plurality of anion-cation exchange membranes are arranged alternately around the center tube 17, and the space between the center tube 17 and the outer casing is divided into a concentrated water chamber 1 and fresh water by an anion-cation exchange membrane.
  • the fresh water chamber 2 is filled with ion exchange resin, and a pair of anion and cation exchange membranes form a membrane pocket filled with an insulating mesh separator, and an insulating mesh separator is also disposed outside the membrane pocket, an anion exchange membrane and insulation
  • the mesh separators are alternately arranged, and the anion-cation exchange membrane and the mesh separator are integrally formed by the central tube 17 as an axis, and a water collecting plate and a water distribution plate are respectively disposed on the upper and lower sides of the anion and cation membrane.
  • the film bag is a fresh water chamber 2, and the outside of the film bag is a concentrated water chamber 1.
  • the film bag is sealed in the axial direction, and the film bag is directly open on both sides in the radial direction, and the opening of the film bag is in the radial direction, one end It is connected to the water inlet of the outer casing 8, and one end is connected to the water outlet of the central pipe 17.
  • a concentrated water outlet 13 is arranged outside the water collecting plate at the upper end of the outer casing 18, and a concentrated water inlet 5 is arranged outside the water discharging plate at the lower end of the outer casing, and fresh water is arranged at the inner side of the water discharging plate at the lower end of the outer casing and the opening of the anion exchange membrane bag.
  • the water inlet 6 flows out of the film bag after flowing through the film bag.
  • the outlet of the heart tube 17 is well utilized, and the external current density is weak.
  • the strong ion is removed.
  • the internal current density is strong, and it is suitable for removing the weak ion.
  • the present invention The insufficiency of the density difference between the inner and outer rings of the coil type electric desalter is well utilized, and a design suitable for the ion removal process of the coil type electric desalter is provided.
  • the concentrated water flows axially from the outside of the membrane bag, and the flow direction of the concentrated water and the fresh water is substantially at an angle of 90 °, thereby effectively reducing the possibility of scaling, thereby improving the water production and ion exchange performance, and prolonging the electric desalination.
  • the service life of the device ( Figure 3).
  • Embodiment 2 As shown in FIG. 4, the spiral coil type electric desalter is centered on the center tube 17, the center tube 17 is an engineering plastic tube, and the surface is coated with a titanium-coated thin plate, and the cathode is used as an electrode.
  • the anode electrode the two electrodes are provided with a DC power source; six pairs of anion-cation exchange membranes are arranged alternately around the center tube 17, and the space between the center tube 17 and the outer casing 18 is divided into a concentrated water chamber by an anion-cation exchange membrane.
  • the fresh water chamber 2 is filled with ion exchange resin, and a pair of anion and cation exchange membranes form a membrane pocket, the number of membrane pockets is straight through the membrane pocket, the opening direction is axial, radial sealing, membrane pocket
  • the inside is a concentrated water chamber 1, the thickness of which is 1. 5mm
  • outside the membrane bag is a fresh water chamber 2
  • the concentrated water chamber 1 is filled with an inert structural material such as a grid
  • the fresh water chamber 2 is filled with an anion-cation exchange resin, the thickness of which is 5 mm, with the center tube 17 as the axis, which is spirally wound into a cylinder.
  • one end of the central pipe 17 ⁇ is a concentrated water inlet 5, and one end is a fresh water outlet 14 , and two partitions are provided between the concentrated water inlet 5 and the fresh water outlet 14 .
  • the tube 17 is partitioned into a hollow straight-through hollow tube; a concentrated water distribution device is arranged at the concentrated water inlet 5, and the concentrated water distribution device is radially arranged in the circumferential direction of the concentrated water inlet 5 of the central tube 17.
  • a concentrated water cloth water hole 19 and a water distribution channel 20 is connected to the cloth water hole 19, and the concentrated water inflow of the water distribution channel 20
  • the cloth water chamber flows into the concentrated water chamber 1 through the water distribution plate 21, since the film bag is a straight axial opening, and the fresh water chamber 2 is provided with a sealing strip in the axial direction, and the concentrated water can only enter the thick water after flowing through the water distribution plate 21.
  • the concentrated water flows directly in the axial direction, flows out over the membrane bag, and flows out of the electric desalter through the concentrated water outlet 13 on the outer casing 18; as shown in Fig.
  • the fresh water flows in from the water inlet 6 on the side of the outer casing 18, and spirally flows through the anion-cation exchange membrane to the fresh water outlet 14 of the center pipe 17.
  • the concentrated water flows upward from the lower direction of the assembly along the axial direction of the assembly.
  • the flow direction of concentrated water and fresh water is at an angle of 90°, forming a cross-flow flow (see Figure 3).
  • the current density of the current acting on it is different.
  • the current density is low; as the fresh water flows in a spiral manner toward the center tube, The current density of the current acting on it is also continuously increased; when fresh water flows close to the central tube region, the current density of the current acting thereon is maximized.
  • This change in current density matches the removal order of the ions to be removed in the fresh water.
  • the first is the removal of high-priced easily removed ions.
  • the required current density is also low; when fresh water flows close to the exit region, the ions to be removed in the fresh water are weakly ionized and difficult to remove ions, and the current density required to remove these ions is also high.
  • the roll type electric desalter in the invention utilizes the characteristics of uneven current density distribution, improves the desalination performance of the module, and particularly improves the removal ability of the weak ionization, and also the ability to remove ions. Improve the efficiency of energy use and reduce energy consumption.
  • the possibility of scale formation in the concentrated water chamber is effectively reduced, thereby relaxing the requirement of the module for the hardness of the fresh water inlet, and also prolonging the electric desalter.
  • the service life reduces the operating cost of the components.
  • Example 3 The desalination test was carried out using the roll type electric desalter in Example 2, and the roll type electric desalter proposed in USP 6,190,528 B1 was used as a comparative test component.
  • the test conditions are as follows, and the test results are shown in Table 1.
  • Example 4 A silicon stripping test was carried out using the coiled electric desalter proposed in Example 2 and USP 6,190,528 B1. The test conditions are as follows, and the test results are shown in Table 2.
  • Example 2 58.0 6.0 253 18.0 96.2 Comparison component 60.0 6.0 249 17.9 82.4 Example 2 59.5 6.0 478 17.9 95.1 Comparison component 60.0 6.0 480 17.7 79.3

Abstract

La présente invention concerne un procédé de désalinisation électrique et un dispositif de désalinisation électrique à enroulement en spirale. Le procédé fait appel à un écoulement croisé d’eau salée et d’eau douce. L’eau salée s’écoule dans la direction axiale et l’eau douce s’écoule en spirale dans la direction radiale. L’invention concerne également un dispositif permettant de mettre en œuvre le procédé, comprenant un tube central formant un pôle d’électrodes et une coque concentrique au tube central sur laquelle est placé l’autre pôle d’électrodes. Plusieurs membranes d’échange d’anions et de cations sont placées en alternance autour du tube central pour diviser l’espace entre le tube central et la coque en chambres à eau salée et en chambres à eau douce. Les chambres à eau douce sont remplies de résine à échange d’ions. Les membranes sont enroulées autour du tube central. Les poches formées par les membranes présentent deux bords en communication. L’entrée d’eau douce est située sur la coque et la sortie est située sur le tube central. Ce type de module réalise une bonne désalinisation et permet de réduire le risque d’entartrage.
PCT/CN2005/000238 2005-02-28 2005-02-28 Procede de desalinisation electrique et dispositif de desalinisation electrique a enroulement en spirale WO2006089460A1 (fr)

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CN108298644A (zh) * 2018-03-15 2018-07-20 博天环境工程（北京）有限公司 一种高效废水盐分离浓缩脱盐一体化装置
CN109081403A (zh) * 2017-06-13 2018-12-25 郭洪飞 一种电容去离子装置及其再生方法
CN109157983A (zh) * 2018-10-16 2019-01-08 上海碧渊实业有限公司 一种多触水面节水环保滤芯装置及其制备方法
CN110510767A (zh) * 2019-09-27 2019-11-29 华电水务工程有限公司 一种多段循环式卷式膜超高压反渗透系统及控制方法

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US5126026A (en) * 1990-09-28 1992-06-30 Allied-Signal Inc. Guard membranes for use in electrodialysis cells
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CN2394705Y (zh) * 1999-09-11 2000-09-06 李翔 组装式螺旋卷式电除盐器
CN1426970A (zh) * 2001-12-21 2003-07-02 中国科学院生态环境研究中心 浓淡水循环卷式电渗析器

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CN109081403A (zh) * 2017-06-13 2018-12-25 郭洪飞 一种电容去离子装置及其再生方法
CN108298644A (zh) * 2018-03-15 2018-07-20 博天环境工程（北京）有限公司 一种高效废水盐分离浓缩脱盐一体化装置
CN108298644B (zh) * 2018-03-15 2024-03-22 博天环境工程（北京）有限公司 一种高效废水盐分离浓缩脱盐一体化装置
CN109157983A (zh) * 2018-10-16 2019-01-08 上海碧渊实业有限公司 一种多触水面节水环保滤芯装置及其制备方法
CN110510767A (zh) * 2019-09-27 2019-11-29 华电水务工程有限公司 一种多段循环式卷式膜超高压反渗透系统及控制方法

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