• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Investigation of Optimal Reactor Structure for Water Treatment in Electric Discharge in Water and on Gas-Liquid Interface

Research Project

Project/Area Number 19K04323
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 21010:Power engineering-related
Research InstitutionNagaoka University of Technology

Principal Investigator

Sugai Taichi  長岡技術科学大学, 工学研究科, 助教 (20535744)

Co-Investigator(Kenkyū-buntansha) 江 偉華  長岡技術科学大学, 工学研究科, 教授 (90234682)
Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords放電 / プラズマ / パルスパワー / 水処理 / 大気圧プラズマ / 放電プラズマ水処理 / オゾン / OHラジカル / 水中放電 / 気液界面プラズマ / コムソル / 気液界面放電 / 高電界
Outline of Research at the Start

放電により酸化力の優れたOHラジカルを生成し、水中有機物を分解することで水を浄化する技術がある。本技術に関する多くの研究が存在するが、これまでどのようなリアクタ構造にすれば、低エネルギーで多くのOHラジカルが有機物と反応するのか明らかになっていない。本研究はそれを明らかにすることを目的として、水中放電方式、気泡内放電方式、水滴表面放電方式のリアクタを設計、製作し、まずOHラジカル生成反応効率と放電形態に対する印加パルス電圧等の影響を調べる。次にオゾン濃度とOHラジカル生成量の関係から、各リアクタのOHラジカル生成経路を調べる。最後に、それらを比較することで最適なリアクタ構造を明らかにする。

Outline of Final Research Achievements

Three reactor types which are discharge in water, discharge on surface of water droplets, and discharge in gas with water droplets were produced and evaluated to discuss optimal reactor structure for discharge plasma water treatment. In the case of discharge in water, energy yield for the decomposition of organic compounds increased with an increase of electric field applied to an electrode. At simulation for the discharge on surface of water droplets, it was shown that electric field around droplets is more enhaced when water droplet is close to an electrode or when the ratio of water droplets to space between electrodes is high. As the result of the evaluations of three reators, the energy yield at discharge in gas with water droplets was the highest, suggesting that active species produced by gas discharge also have important role for the decompositon of organic compounds.

Academic Significance and Societal Importance of the Research Achievements

今後の放電プラズマ水処理技術の研究進展に役立つ次の新規の発見が得られた。水中放電では放電のための電界が大きいほどOHラジカルによる有機物分解の効率が高くなる。また、事前にパルス電界をかけることで水の絶縁破壊電界が約数百マイクロ秒間減少する。平等電界に水滴を噴霧すると、電界は水滴周辺に集中するが、特に水滴が電極に近い場合と電極に対して水滴が占める割合が大きい場合にその増幅度が大きくなる。水滴気中放電の場合、パルス幅をプラズマ先端の高電界部が存在する時間より短くし、周期を干渉を引き起こす活性種の寿命よりも長くすることでオゾンとOHラジカルの生成効率が高くなる。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (10 results)

All 2023 2022 2021 2019

All Journal Article (3 results) (of which Peer Reviewed: 3 results) Presentation (7 results) (of which Int'l Joint Research: 3 results,  Invited: 2 results)

  • [Journal Article] The Influence of Pulse Shape on the Production of OH Radicals by Pulsed Discharge2023

    • Author(s)
      Thanh Phung Nhat、Sugai Taichi、Tokuchi Akira、Jiang Weihua
    • Journal Title

      IEEE Transactions on Plasma Science

      Volume: 51 Issue: 1 Pages: 199-204

    • DOI

      10.1109/tps.2022.3229734

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The Effect of Pulse Discharge Control on Ozone Production2022

    • Author(s)
      Thanh Phung Nhat、Sugai Taichi、Tokuchi Akira、Jiang Weihua
    • Journal Title

      IEEE Transactions on Plasma Science

      Volume: 50 Issue: 4 Pages: 936-941

    • DOI

      10.1109/tps.2022.3161425

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Amplification of nanosecond pulsed power by synchronization of double inductive energy storage circuit2019

    • Author(s)
      Taichi Sugai, Kosuke Yawata, Akira Tokichi, Weihua Jiang
    • Journal Title

      IEEE Transactions on Plasma Science

      Volume: 47 Pages: 4506-4511

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] パルス高電圧による絶縁耐力低下とその回復特性2022

    • Author(s)
      須貝太一、徳地明、江偉華
    • Organizer
      電気学会 放電・プラズマ・パルスパワー研究会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Design of a Water Purification Reactor Using Plasma on Surface of Water Droplets2022

    • Author(s)
      Taichi Sugai, Akira Tokuchi, Weihua Jiang, Yasushi Minamitani
    • Organizer
      Euro-Asian Pulsed Power Conference
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Evaluating the Effect of Pulse Shape on OH Radical Production at Secondary Streamer Phase2022

    • Author(s)
      Nhat Thanh Phung, Taichi Sugai, Akira Tokuchi, Weihua Jiang
    • Organizer
      Euro-Asian Pulsed Power Conference
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Influence of Electric Field and Gap Length on OH Radical Production by Pulsed Electric Discharge in Water2021

    • Author(s)
      Taichi Sugai, Akira Tokuchi, Weihua Jiang
    • Organizer
      Euro Asian Pulsed Power Conference 2020
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] The Effect of Pre-Electric-Field on Electric Breakdown in Water2021

    • Author(s)
      Taichi Sugai, Akira Tokuchi, Weihua Jiang
    • Organizer
      2021 IEEE Pulsed Power Conference
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 誘導重畳型パルス電源を用いた水中絶縁破壊の研究2021

    • Author(s)
      須貝太一、徳地明、江偉華
    • Organizer
      2021年度核融合科学研究所共同研究形式研究会
    • Related Report
      2021 Research-status Report
  • [Presentation] Characterization of Nano-second Pulsed Power Generator Synchronizing Double Inductive Energy Storage Circuits2019

    • Author(s)
      Taichi Sugai, Kosuke Yawata, Yiwen Yang, Akira Tokichi, Weihua Jiang
    • Organizer
      IEEE Pulsed Power and Plasma Science 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

URL: 

Published: 2019-04-18   Modified: 2024-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi