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CN-122029134-A - Water treatment device

CN122029134ACN 122029134 ACN122029134 ACN 122029134ACN-122029134-A

Abstract

Provided is a water treatment device provided with an electrolytic bath capable of containing water to be treated, a first electrode and a second electrode immersed in the water to be treated in the electrolytic bath, and a control unit that controls the energization of the first electrode and the second electrode. In this water treatment device, the first electrode and the second electrode have a catalyst layer on the electrode surface. The control unit is configured to be capable of switching to either an electrolysis mode for electrolyzing the water to be treated or a film formation mode for forming an oxide film on the catalyst layer of the anode of the first electrode and the second electrode, and is configured to be capable of reversing the polarity between the first electrode and the second electrode when switching from the electrolysis mode to the film formation mode.

Inventors

  • Plant House Promotion
  • KODA NOBUO

Assignees

  • 松下住空间株式会社

Dates

Publication Date
20260512
Application Date
20241031
Priority Date
20231116

Claims (15)

  1. 1. A water treatment device, wherein, The water treatment device is provided with: An electrolytic cell capable of storing water to be treated; A first electrode and a second electrode immersed in the water to be treated in the electrolytic bath, and A control unit that controls energization of the first electrode and the second electrode, The first electrode and the second electrode are provided with a catalyst layer on the electrode surface, The control unit is configured to be capable of switching to either an electrolysis mode for electrolyzing the water to be treated or a film formation mode for forming an oxide film on the catalyst layer of the anode in the first electrode and the second electrode, The control unit is configured to be able to reverse the polarity between the first electrode and the second electrode when switching from the electrolysis mode to the film formation mode.
  2. 2. The water treatment device according to claim 1, wherein, The film formation mode, the electrolysis mode, and the polarity inversion are performed in this order.
  3. 3. The water treatment device according to claim 1, wherein, The electrolytic mode is performed after the film formation mode, An electrode of the first electrode and the second electrode, which is provided with the catalyst layer for forming the oxide film in the film formation mode, functions as an anode in the electrolysis mode.
  4. 4. The water treatment device according to claim 1, wherein, In the film formation mode, an electrode potential different from the electrolysis mode is applied.
  5. 5. The water treatment device according to claim 1, wherein, The control unit applies a predetermined electrode potential to the first electrode and the second electrode by current value control.
  6. 6. The water treatment device according to claim 1, wherein, The control unit applies a predetermined electrode potential to the first electrode and the second electrode by voltage value control.
  7. 7. The water treatment device according to claim 1, wherein, The catalyst layer includes at least 1 noble metal selected from the group consisting of platinum, iridium, palladium, gold, silver, ruthenium, and rhodium.
  8. 8. The water treatment device according to claim 1, wherein, The catalyst layer is a noble metal catalyst layer containing at least platinum.
  9. 9. The water treatment device according to claim 8, wherein, In the film formation mode, an electrode potential of an electrode serving as an anode of the first electrode and the second electrode is 800mV or more and 1500mV or less based on a standard hydrogen electrode potential.
  10. 10. The water treatment device according to claim 1, wherein, The control unit repeatedly and sequentially executes the coating film formation mode, the electrolysis mode, and the polarity inversion processing cycle.
  11. 11. The water treatment device according to claim 1, wherein, The energization time of the film formation mode is set to 3% to 60% of the energization time of the electrolysis mode.
  12. 12. The water treatment device according to claim 1, wherein, The water treatment device further comprises a pretreatment unit through which the water to be treated passes before being supplied to the electrolytic cell, The pretreatment unit removes at least a part of the metal component contained in the water to be treated.
  13. 13. The water treatment device according to claim 12, wherein, The metal component is a transition metal component contained in a pipe through which the water to be treated passes.
  14. 14. The water treatment device according to claim 12, wherein, The metal component contains at least 1 selected from the group consisting of Fe, cu, cr, mn and Ni.
  15. 15. The water treatment device according to claim 1, wherein, The water treatment apparatus further includes a pipe through which the water to be treated supplied to the electrolytic cell passes, At least a portion of the pipe that contacts the water to be treated is formed of a resin material.

Description

Water treatment device Technical Field The present disclosure relates to water treatment devices. Background Conventionally, as a water treatment apparatus for obtaining a product applicable to various applications by electrolyzing water using an electrode having a catalyst layer, an alkali ion water purifier, a hypochlorous acid generator, an electrolytic water softener, or the like has been known. Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 2000-42551 Patent document 2 Japanese patent application laid-open No. 2007-260492 Patent document 3 International publication No. 2003/000957 Patent document 4 Japanese patent laid-open publication No. 2005-74307 Patent document 5 Japanese patent application laid-open No. 2012-81449 Disclosure of Invention Problems to be solved by the invention In a conventional water treatment apparatus, an operation of switching the polarity of current flowing to an electrode is performed in order to prevent insulating solid materials called scale from adhering to the surface of the electrode and blocking electrolysis (patent documents 1 to 5). The present inventors have found that in such a water treatment apparatus, the catalyst layer disposed on the electrode surface is consumed with the polarity switching of the electrode and subsequent energization for electrolysis, and the electrolysis efficiency of water may be lowered. The present disclosure has been made in view of the above problems. That is, a main object of the present disclosure is to provide a water treatment apparatus capable of appropriately suppressing the consumption of a catalyst layer. Means for solving the problems The present inventors have attempted to solve the above-described problems by coping with a new direction, instead of coping with the concept of the related art. As a result, the present application has been completed for a water treatment apparatus that achieves the above-described main object. The water treatment device includes an electrolytic tank capable of storing water to be treated, a first electrode and a second electrode immersed in the water to be treated in the electrolytic tank, and a control unit configured to control energization of the first electrode and the second electrode, wherein the first electrode and the second electrode are provided with a catalyst layer on an electrode surface, the control unit is configured to be capable of switching to one of an electrolysis mode for electrolyzing the water to be treated and a film formation mode for forming an oxide film on the catalyst layer of an anode in the first electrode and the second electrode, and the control unit is configured to be capable of reversing polarity between the first electrode and the second electrode when switching from the electrolysis mode to the film formation mode. Effects of the invention According to the water treatment device of one embodiment of the present disclosure, the consumption of the catalyst layer can be appropriately suppressed. Drawings Fig. 1 is a schematic view showing a water treatment apparatus according to a first embodiment of the present disclosure. Fig. 2A is a schematic cross-sectional view of an electrode used in the water treatment apparatus of the first embodiment of the present disclosure. Fig. 2B is a schematic cross-sectional view of an electrode provided with an oxide film according to the first embodiment of the present disclosure. Fig. 3A is an energization graph of a water treatment device of an embodiment of the present disclosure. Fig. 3B is an energization graph of a water treatment device of an embodiment of the present disclosure. FIG. 3C is a typical power-on graph of a prior art water treatment device. Fig. 4 is a schematic view showing a water treatment apparatus according to a second embodiment of the present disclosure. Fig. 5 is a bar chart showing the results of the film thickness maintenance rate of the catalyst layer obtained in the water treatment apparatus according to the embodiment of the present disclosure and the conventional water treatment apparatus. Fig. 6 is a bar graph showing the life of a catalyst layer obtained in a water treatment apparatus according to an embodiment of the present disclosure and a conventional water treatment apparatus. Detailed Description Embodiments of the present disclosure are specifically described below. The applicant provides the following description and examples in order to provide those skilled in the art with a thorough understanding of the present disclosure, it being noted that it is not intended to limit the subject matter recited in the claims by these. That is, the present disclosure is not particularly limited to the preferred embodiments described below, and can be implemented with appropriate modifications within the scope of the purpose thereof. In addition, although the description and understanding of the points are sometimes shown as embodiments, examples, and the li