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WO2016119482A1 - Élément membranaire et dispositif de traitement de l'eau - Google Patents

Élément membranaire et dispositif de traitement de l'eau Download PDF

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Publication number
WO2016119482A1
WO2016119482A1 PCT/CN2015/091246 CN2015091246W WO2016119482A1 WO 2016119482 A1 WO2016119482 A1 WO 2016119482A1 CN 2015091246 W CN2015091246 W CN 2015091246W WO 2016119482 A1 WO2016119482 A1 WO 2016119482A1
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WO
WIPO (PCT)
Prior art keywords
membrane element
electrode
membrane
water
pure water
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2015/091246
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English (en)
Chinese (zh)
Inventor
黄燕
李顺勇
王晨
李魁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AO Smith Nanjing Water Treatment Products Co Ltd
Original Assignee
AO Smith Nanjing Water Treatment Products Co 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 AO Smith Nanjing Water Treatment Products Co Ltd filed Critical AO Smith Nanjing Water Treatment Products Co Ltd
Publication of WO2016119482A1 publication Critical patent/WO2016119482A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/08—Prevention of membrane fouling or of concentration polarisation

Definitions

  • the present invention relates to a membrane element and a water treatment device.
  • the reverse osmosis membrane element is a core component of the membrane water treatment technology, and is capable of removing microorganisms, ions, and the like from a water source to obtain pure water.
  • CN 104084048 A and CN 104096483 A Chinese patent application have been described for reverse osmosis membrane elements.
  • CN 104084048 A structure of the membrane element disclosed in A is shown in Figures 1 and 2.
  • the membrane elements disclosed in CN 104084048 A and CN 104096483 A have the following technical problems.
  • the inlet electrode is arranged in the inlet grid portion, and the amount of water remaining in the portion is small, and the membrane element is not cleaned when it is cleaned; in addition, the electrodes at both ends are arranged inside the membrane element, and after long-term operation, it is easy to The formation of inorganic salt scale at the surface of the membrane easily breaks the separation layer on the surface of the membrane, thereby posing a certain risk to the separation performance of the membrane.
  • the present invention provides the following technical solutions.
  • a membrane element having a membrane, a water inlet electrode and a pure water electrode, wherein the inlet electrode and the pure water electrode are respectively connected to two poles of a power source, characterized in that: A pure water electrode is disposed on the pure water side of the membrane on the outermost side of the membrane element, and a water electrode is disposed on the water inlet side of the membrane on the outermost side of the membrane element.
  • the membrane element as described above, wherein the membrane element further comprises a pure water guide cloth and a water inlet grid, the pure water end electrode being arranged on the pure water guide cloth.
  • the inlet end electrode is spirally wound or in the form of an electrode sleeve It is fixed to the outer peripheral wall of the membrane element.
  • a water-permeable protective layer is provided between the outermost membrane and the inlet electrode.
  • the protective layer material is a guide cloth and/or a grid.
  • a membrane element as described above, wherein the membrane element is a rolled tubular element, and a flow of influent water permeates into the membrane element along a gap at both ends of the membrane element or penetrates into the membrane along a gap of the membrane element tail Inside the element, the waste water stream oozes along the outer side of the membrane element toward the circumferential surface.
  • the pure water end electrode is connected to the negative electrode of the power source, and the inlet electrode is connected to the positive electrode of the power source.
  • the polarity of the power source connected to the water inlet end electrode and the pure water end electrode is interchanged after the membrane element is completely watered.
  • the membrane element as described above, the pure water end electrode and the inlet end electrode are energized during operation of the membrane element, and/or the membrane element is shut down after the water production operation and the electrode is energized for a predetermined time, after which the sewage is discharged after a predetermined time of immersion.
  • the pure water end electrode is connected to the positive electrode of the power source, and the water inlet end electrode is connected to the negative electrode of the power source.
  • the membrane element is turned off and the electrode is energized for a predetermined time, and then the sewage is discharged after a predetermined time of immersion.
  • a water treatment device comprising a membrane element as described above.
  • the invention mainly improves the service life and the recovery rate of the membrane element on the basis of the existing membrane elements.
  • the electrolysis of water is used to reduce the LSI index of the influent, thereby reducing Membrane element fouling tendency
  • the membrane element is periodically shut down and cleaned, and the inorganic salt scale of the membrane element is dissolved by the acidic solution formed outside the membrane element; or The organic matter scale of the membrane element is dissolved by an alkaline solution formed outside the membrane element.
  • the reverse polarity treatment can be used to form an aqueous solution of opposite polarity on the outer side of the membrane element, so that the entire membrane element is immersed, thereby removing inorganic or organic scale on the surface of the membrane, thereby recovering the flow rate of the membrane element.
  • FIG. 1 is a schematic view of a roll-type membrane element of the prior art of the present invention, wherein the direction of opening of the inlet end is inconsistent with the direction of flow of the main body of the influent water;
  • Fig. 2 is a schematic view of another roll type membrane element of the prior art of the present invention, wherein the inlet end opening direction coincides with the flow direction of the inlet water flow main body.
  • Figure 3 is a schematic illustration of a roll-type membrane element of the present invention.
  • Fig. 4 is a schematic view showing the arrangement of external electrodes of the rolled film element of the present invention.
  • Figure 5 is a comparison of the current efficiency of the new scheme of the present invention over the original scheme of CN 104084048 A and CN 104096483 A.
  • Figure 6 shows that the performance of the roll-type membrane element prepared by the present invention has a high consistency, wherein 1#-4# respectively represent four membrane elements prepared by the method of Examples 1-4 of the present invention, which are continuously operated in a long period of time.
  • Figure 7 is a schematic view showing the fouling area of the inorganic salt of the membrane element of CN 104084048 A and CN 104096483 A;
  • Figure 8 is a schematic view of the fouling occurrence region of the present invention.
  • 1 denotes a diaphragm
  • 2 denotes a water inlet grid
  • 3 denotes a pure water guide cloth
  • 4 denotes a water collection tube
  • 5 denotes a pure water end electrode
  • 6 denotes a water inlet end electrode
  • 7 denotes a side glue and a seal Glue
  • 8 indicates the waterproof rubber zone.
  • the LSI index refers to the water quality stability index, which is a parameter for measuring the tendency of water quality to scale.
  • LSI>0 the larger the value, the more easily the water quality is fouled;
  • LSI ⁇ 0 the larger the absolute value, the more likely it is to cause corrosion;
  • LSI 0, no scaling or corrosion.
  • Alkalinity refers to the total amount of substances that can neutralize strong acids in water. These substances include strong bases, weak bases, strong base weak acid salts, and the like.
  • Hardness refers to the concentration of calcium and magnesium ions in water.
  • a prior art roll-type membrane element as shown in Figure 1, the flow of water enters the membrane element in the direction of the arrow, after confluence in the membrane element, in a direction substantially perpendicular to the direction of water inlet (i.e., the direction of the arrow) (i.e., membrane element)
  • the length direction flows.
  • the main direction of the influent water flow refers to the longitudinal direction of the membrane element
  • the effective length of the inlet flow passage in the flow direction of the main body of the influent water is indicated by C in FIG.
  • B indicates the closest distance of the electrode wire or the electrode sheet (plate) from the pure water outlet end.
  • FIG. 2 Another prior art roll-type membrane element is shown in Figure 2, in which water flows into the membrane element in the direction of the arrow and then exits the membrane element in the direction of the arrow.
  • the direction of the main body of the influent water is the width of the membrane element.
  • C' the effective length of the inlet passage in the direction of flow of the main body of the influent water.
  • A indicates the distance between the arrangement area of the electrode wire or the electrode sheet (plate) in the flow direction of the main body of the influent water.
  • B' indicates the closest distance of the electrode wire or the electrode sheet (plate) from the inlet end of the raw water.
  • the membrane element of the present invention is shown in Figure 3.
  • the pure water end electrode 5 is arranged at the end of the pure water guide cloth 3 away from the water collecting pipe 4, wherein the water flow direction can be as shown in Fig. 1, and the water flows from the water collecting pipe and flows out along the diaphragm;
  • the direction of the water flow is shown, that is, water is fed from the end of the diaphragm away from the water collecting pipe, and flows out from the outlets near the water collecting pipe in the direction of the water inlet flow path.
  • Fig. 4 is a schematic view showing the arrangement of external electrodes of the rolled film element of the present invention.
  • an electrode inlet end electrode
  • the raw water is fed into the water from the side of the rolled membrane element, and pure water is taken out from the water collecting tube in the center of the rolled membrane element in the drawing.
  • Figure 7 is a schematic illustration of the inorganic salt fouling zone of membrane elements of CN 104084048 A and CN 104096483 A. As shown in FIG.
  • the prior art inlet electrode is arranged in the central portion of the inlet grid, and since the amount of water remaining in the portion is small, it is difficult to clean the membrane element, and since both ends of the electrode are disposed on the membrane element.
  • the scale is usually yellow, since the black and white image is shown in Fig. 7, the gray stain is part of the scale
  • the scale is easy to break the separation layer on the surface of the membrane, thereby facing the membrane.
  • the separation performance of the sheet creates a certain risk.
  • FIG. 8 is a schematic view of the fouling occurrence region of the present invention.
  • scale is formed on the outer periphery of the membrane element (the scale is usually yellow, and since the black-and-white diagram is shown in Fig. 8, the gray stain portion is scale), and it is very easy to clean.
  • the roll-type membrane element of the present invention can be subjected to an inverted polarity treatment, that is, the positive electrode and the negative electrode are exchanged such that an aqueous solution of opposite polarity is formed on the outer side of the membrane element, and the entire membrane element is immersed, so that the membrane can be removed without manual washing.
  • the organic and inorganic substances on the surface of the sheet are fouled.
  • the membrane element of the present invention can produce an acidic cleaning aqueous solution for removing inorganic scale, an alkaline aqueous solution for removing organic scale, and an inverted aqueous solution by reverse polarity treatment. Remove inorganic and organic scales.
  • the pure water guide cloth of the 1810-75G-ss side flow type (change in the water inlet direction) of the reverse osmosis membrane element (the basic structure is as shown in Fig. 1, but the electrode arrangement is in the manner of Fig. 3 of the present invention) 12cm ⁇ 16cm conductive
  • the metal mesh is used as a pure water end electrode, and a 1 m long ruthenium-coated titanium wire is wound around the membrane element as a water inlet electrode to prepare a novel roll membrane element for controlling membrane fouling, and the pure water end electrode wire is connected to the negative electrode of the DC power source.
  • the inlet electrode wire is connected to the positive electrode of the DC power source, and after the operation for a period of time, the membrane element is cleaned by the electrode, and the acid salt generated in the membrane shell is used to dissolve the inorganic salt scale on the membrane element.
  • the recovery rate of the membrane element was increased to 66%, and the operation was continued. When the accumulated operation was carried out for 12 hours, it was washed for 30 minutes, and when the cumulative pure water flow rate reached 7t, the pure water flow rate decay rate of the membrane element reached 20%, and no electrode was added.
  • the recovery rate of the cleaned membrane element was maintained at 50%, and the pure water flow rate decay rate of the membrane element reached 27% when the pure water flow rate reached 7t.
  • the electrode element After running for a period of time, the electrode element is used to clean the membrane element, and the acid generated in the membrane shell is used to dissolve the inorganic salt scale on the membrane element.
  • the recovery rate of the membrane element was increased to 50%, and the operation was continued. When the accumulated operation was carried out for 12 hours, it was washed for 30 minutes, and when the cumulative pure water flow rate reached 8t, the pure water flow rate decay rate of the membrane element reached 20%, and no electrode was added.
  • the recovery rate of the cleaned membrane element was maintained at 30%, and the pure water flow rate decay rate of the membrane element reached 23% when the pure water flow rate reached 6t.
  • a 6 cm ⁇ 26 cm conductive metal mesh was added as a pure water in a pure water guide cloth of a reverse osmosis membrane element (the basic structure and electrode arrangement shown in Fig. 3) of the 3013-600-ss side flow type (change in the water inlet direction).
  • the water-end electrode and the membrane element are made of a titanium-coated titanium mesh as a water inlet electrode, and a novel roll membrane element for controlling film fouling is prepared, and the pure water end electrode wire is connected with the negative electrode of the DC power source, and the inlet electrode wire and the DC wire are connected.
  • the positive electrode of the power source is connected, and after the operation for a period of time, the membrane element is cleaned by the electrode, and the acid generated in the membrane shell is used to dissolve the inorganic salt scale on the membrane element.
  • the recovery rate of the membrane element was increased to 66%, and the operation was continued. When the accumulated operation was performed for 8 hours, it was washed for 30 minutes, and when the cumulative pure water flow rate reached 12t, the pure water flow rate attenuation rate of the membrane element reached 15%, and no electrode was added.
  • the recovery rate of the cleaned membrane element was maintained at 50%, and the pure water flow rate decay rate of the membrane element reached 25% when the pure water flow rate reached 12t.
  • a 6 cm ⁇ 26 cm conductive metal mesh was added as a pure water in a pure water guide cloth of a reverse osmosis membrane element (the basic structure and electrode arrangement shown in Fig. 3) of the 3013-600-ss side flow type (change in the water inlet direction).
  • Water electrode A 2m long ruthenium-coated titanium wire is wound as a water inlet end electrode to prepare a novel roll membrane element for controlling film fouling.
  • the pure water end electrode wire is connected to the positive electrode of the DC power source, and the inlet electrode wire and the DC power supply negative electrode are connected. Connected, used for regular cleaning in the influent water source with more serious organic pollution.
  • the membrane element After running for a period of time, the membrane element is cleaned by the electrode, and the organic matter on the membrane element is contaminated by the alkali generated in the membrane shell.
  • the recovery rate of the membrane element was increased to 66%, and the operation was continued. After 6 hours of cumulative operation, it was cleaned for 30 minutes. When the cumulative pure water flow rate reached 14t, the pure water flow rate decay rate of the membrane element reached 17%, and no electrode was added. The recovery rate of the cleaned membrane element was maintained at 50%, and the pure water flow rate decay rate of the membrane element reached 25% when the pure water flow rate reached 14t.
  • a 6 cm ⁇ 26 cm conductive metal mesh was added as a pure water in a pure water guide cloth of a reverse osmosis membrane element (the basic structure and electrode arrangement shown in Fig. 3) of the 3013-600-ss side flow type (change in the water inlet direction).
  • the water-end electrode and the platinum-coated titanium mesh are used as the inlet end electrode to prepare a novel roll-type membrane element for controlling membrane fouling, and the pure water end electrode wire is connected with the negative electrode of the DC power source, and the inlet electrode wire and the direct current electrode are connected.
  • the positive electrode of the power supply is connected.
  • the membrane element When the flow rate attenuation of the membrane element is reduced to 30% after running for a period of time, the membrane element is cleaned by the electrode, and the inorganic scale on the membrane element is contaminated by the acid generated in the membrane shell. After four times, after each 30 minutes of cleaning, the flow rate of the membrane element was recovered, which was substantially similar to the initial membrane element flow.
  • the membrane element is cleaned by the electrode, and the acid generated in the membrane shell is used to dissolve the inorganic salt scale on the membrane element.
  • the reverse polarity treatment is performed, the pure water end wire is connected to the positive electrode, the inlet electrode wire is connected to the negative electrode, and the alkali salt generated in the membrane shell is used to dissolve the inorganic salt scale on the membrane element.
  • the recovery rate of the membrane element was increased to 66%, and the operation was continued. When the accumulated operation was carried out for 12 hours, it was washed for 30 minutes, and when the cumulative pure water flow rate reached 20 tons, the pure water flow rate attenuation rate of the membrane element reached 18%, and no electrode was added.
  • the recovery rate of the cleaned membrane element was maintained at 50%, and when the pure water flow rate reached 17t, the pure water flow rate decay rate of the membrane element reached 25%.
  • FIG. 5 is a data view of Example 7, in which a film element (the original solution in Figure 5) rolled in the manner of Example 1 of CN 104084048 A is compared with a roll-up method using the embodiment 1 of the present invention.
  • the current efficiency of the membrane elements (new scheme in Figure 5), ie the magnitude of the current at different voltages. It can be clearly seen from Fig. 5 that with the rolling scheme of this patent, the voltage required to achieve the same current is lower, that is, the current regulation of the new scheme is greater within a certain voltage range.
  • FIG. 6 is a test of the variation of the long-running desalination rate of the selected four membrane elements in which the membrane element was operated in a continuous manner to test the reliability of the membrane element prepared by the patented rolling method. It was found that the desalination rate of the membrane element was hardly attenuated during the entire operation, and the desalination rate was not attenuated when the final operation reached the membrane element life. It indicates that the reliability of the membrane element is high.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

La présente invention concerne un élément membranaire et un dispositif de traitement de l'eau comprenant celui-ci, l'élément membranaire comprenant une feuille membranaire (1), une électrode (6) côté admission d'eau et une électrode (5) côté eau pure; et l'électrode (6) côté admission d'eau et l'électrode (5) côté eau pure sont respectivement connectées à deux électrodes d'un bloc d'alimentation. L'électrode (5) côté eau pure est disposée du côté de l'eau pure de la feuille membranaire (1) de l'élément membranaire le plus à l'extérieur, et l'électrode (6) côté admission d'eau est disposée du côté de l'admission d'eau de la feuille membranaire (1) de l'élément membranaire le plus à l'extérieur.
PCT/CN2015/091246 2015-01-30 2015-09-30 Élément membranaire et dispositif de traitement de l'eau Ceased WO2016119482A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201510051209.5A CN104671536A (zh) 2015-01-30 2015-01-30 膜元件和水处理装置
CN2015100512095 2015-01-30

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WO2016119482A1 true WO2016119482A1 (fr) 2016-08-04

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104671536A (zh) * 2015-01-30 2015-06-03 艾欧史密斯（上海）水处理产品有限公司 膜元件和水处理装置
CN104843912B (zh) 2015-05-11 2020-03-13 艾欧史密斯（南京）水处理产品有限公司 过滤装置及其清洗方法
HK1250961A1 (zh) * 2015-08-10 2019-01-18 水技术国际有限责任公司 用於在反渗透膜中减轻生物结垢的方法和设备

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JPH10323545A (ja) * 1997-05-23 1998-12-08 Kurita Water Ind Ltd 膜分離装置
JPH11128698A (ja) * 1997-10-29 1999-05-18 Fuji Electric Co Ltd 水処理ろ過膜の逆圧水洗浄方法およびその装置
CN101721915A (zh) * 2008-10-28 2010-06-09 财团法人工业技术研究院 薄膜清洗方法与装置
CN202398295U (zh) * 2012-01-11 2012-08-29 天津大学 具有电解氧化作用的螺旋卷式膜元件
CN104084048A (zh) * 2014-06-27 2014-10-08 艾欧史密斯（上海）水处理产品有限公司 膜元件、水处理装置及水处理方法
CN104096483A (zh) * 2014-08-06 2014-10-15 艾欧史密斯（上海）水处理产品有限公司 一种膜元件、使用该膜元件的装置及水处理方法
CN204107340U (zh) * 2014-06-27 2015-01-21 艾欧史密斯（上海）水处理产品有限公司 膜元件及水处理装置
CN204159229U (zh) * 2014-08-06 2015-02-18 艾欧史密斯（上海）水处理产品有限公司 一种膜元件和使用该膜元件的装置
CN104671536A (zh) * 2015-01-30 2015-06-03 艾欧史密斯（上海）水处理产品有限公司 膜元件和水处理装置
CN204848532U (zh) * 2015-01-30 2015-12-09 艾欧史密斯（上海）水处理产品有限公司 膜元件和水处理装置

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989000445A1 (fr) * 1987-07-17 1989-01-26 Battelle Memorial Institute Appareil et procede utilisant un electrofiltre pour empecher l'encrassement des filtres dans des procedes de filtration a courant transversal
JPH10323545A (ja) * 1997-05-23 1998-12-08 Kurita Water Ind Ltd 膜分離装置
JPH11128698A (ja) * 1997-10-29 1999-05-18 Fuji Electric Co Ltd 水処理ろ過膜の逆圧水洗浄方法およびその装置
CN101721915A (zh) * 2008-10-28 2010-06-09 财团法人工业技术研究院 薄膜清洗方法与装置
CN202398295U (zh) * 2012-01-11 2012-08-29 天津大学 具有电解氧化作用的螺旋卷式膜元件
CN104084048A (zh) * 2014-06-27 2014-10-08 艾欧史密斯（上海）水处理产品有限公司 膜元件、水处理装置及水处理方法
CN204107340U (zh) * 2014-06-27 2015-01-21 艾欧史密斯（上海）水处理产品有限公司 膜元件及水处理装置
CN104096483A (zh) * 2014-08-06 2014-10-15 艾欧史密斯（上海）水处理产品有限公司 一种膜元件、使用该膜元件的装置及水处理方法
CN204159229U (zh) * 2014-08-06 2015-02-18 艾欧史密斯（上海）水处理产品有限公司 一种膜元件和使用该膜元件的装置
CN104671536A (zh) * 2015-01-30 2015-06-03 艾欧史密斯（上海）水处理产品有限公司 膜元件和水处理装置
CN204848532U (zh) * 2015-01-30 2015-12-09 艾欧史密斯（上海）水处理产品有限公司 膜元件和水处理装置

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