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Elucidation of OH Radical Production Process for Realization of High Efficeincy Water Treatment by Atomospheric Pressure Plasma

Research Project

Project/Area Number 16K17535
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Plasma electronics
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)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywordsパルスパワー / 大気圧プラズマ / 水処理 / 高電圧 / 放電 / プラズマ / OHラジカル / オゾン / プラズマエレクトロニクス / プラズマ化学
Outline of Final Research Achievements

At water treatment by atmospheric plasma, OH radical which is high oxidant potential, generated by plasma, decomposes organic compounds. We have to understand the production process of OH radical to realize high efficiency water treatment. For that, at this research, amount of OH radical was compared in case of spraying water into ozone space and in case of irradiating plasma on sprayed water droplets in similar ozone concentration condition with that. The result showed that amount of OH radical depended on ozone concentration. Further, OH radical rather decreased by plasma irradiation. From the results, we conclude that OH radical is produced by interaction between water and ozone produced by plasma.

Academic Significance and Societal Importance of the Research Achievements

大気圧プラズマを用いた水処理技術は水中の難分解性物質を分解する技術の一つとして、盛んに研究されている。その技術において、更なる高効率化が実用に向けた課題となっている。大気圧プラズマ水処理方式はいくつかあるが、その中でも気中のプラズマ空間に水滴を噴霧する方式は染料脱色においては最も高い効率を実現できる方式であることがわかっている。今回はその方式におけるOHラジカルの生成過程を解明した。特にOHラジカル生成量はオゾン濃度に依存するという結論は本分野全体における高効率化研究の重要な指針となる。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (6 results)

All 2019 2018 2017

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (5 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] The Effect of Oxygen and Argon Gas Flow Rate on OH Radical Production and Dye Decolorization by Pulse Discharge in Spray Droplet Reactor2019

    • Author(s)
      Rwahila Tawakal, Sugai Taichi, Tokuchi Akira, Jiang Weihua
    • Journal Title

      IEEE Transactions on Plasma Science

      Volume: 印刷中

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Presentation] 水滴含有パルス大気圧放電におけるOHラジカル生成機構2019

    • Author(s)
      須貝太一 , Tawakal Selemani Rwahila,徳地明, 江偉華
    • Organizer
      NIFS パルスパワー研究会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Influence of Density of Ozone and Plasma on OH Radical Generation2018

    • Author(s)
      Taichi Sugai, Tawakal Rwajila,Akira Tokuchi, Weihua
    • Organizer
      IEEE International Power Modulator and High Voltage Conference
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 水滴存在下大気圧プラズマにおけるOHラジカル生成機構解明のための実験2018

    • Author(s)
      須貝 太一 , ルワヒラ タワカル, 中川 隼輔,徳地 明, 江 偉華
    • Organizer
      電気学会 放電・プラズマ・パルスパワー合同研究会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Influence of Density of Ozone and Plasma on OH Radical Generation2018

    • Author(s)
      Taichi Sugai, Tawakal Rwahila, Akira Tokuchi, Weihua Jiang
    • Organizer
      2018 IEEE International Power Modulator and High Voltage Conference
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Study of OH Radical Generation Process in Pulsed Air Discharge Including Water Droplets2017

    • Author(s)
      Taichi Sugai, Weihua Jiang, Akira Tokuchi
    • Organizer
      The 2017 Pulsed Power Conference
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research

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Published: 2016-04-21   Modified: 2020-03-30  

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