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Generation of large-capacity discharge plasma with seawater, and sterilization of bacteria in ballast water

Research Project

Project/Area Number 17K14636
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Power engineering/Power conversion/Electric machinery
Research InstitutionIwate University

Principal Investigator

Masahiro Akiyama  岩手大学, 理工学部, 准教授 (50611430)

Project Period (FY) 2017-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywordsパルスパワー / バラスト水 / 海水 / 高電圧 / 水中放電 / バラスト / プラズマ / 沿面放電 / FPGA / 電気機器工学 / プラズマ・核融合
Outline of Final Research Achievements

Underwater discharge was performed using a pulse power generator with a shot of 0.5 j. At 500 shots / sec, the electron temperature was 7841.8 K and the electron density was 6.0 × 10^17.The maximum voltage was about 25 kV, the maximum current was about 20 A, and the pulse width was about 3 μm. The measurement result of H2O2 was 0.732 mg / L at 45,000 μS / cm at 150,000 shots.
As a result of treating E. coli using a dielectric barrier discharge, the standard set by the IMO was cleared. And, the underwater discharge was also close to the standard value. Similarly, for Enterococci and Vibrio sp., number of colonies could be reduced by increasing the number of shots. In the plankton experiment, underwater discharge was able to remove up to 0 animals.

Academic Significance and Societal Importance of the Research Achievements

水が関与する放電プラズマ現象は、水中放電、沿面放電、泡の中での放電等多くの研究がなされ、水処理への応用もなされている。しかしながら、海水等、高い導電率を持つ水が関与する放電プラズマの研究は、バラスト水処理、温泉水処理等多くの応用があるにもかかわらず、その難しさからほとんど行われていない。本研究によって、放電プラズマによりIMOが定めるバラスト水排出基準の5種類中4種類に関して新たな処理の可能性を見出せた。

Report

(5 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (19 results)

All 2021 2020 2019 2017

All Journal Article (6 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 6 results,  Open Access: 1 results) Presentation (13 results) (of which Int'l Joint Research: 7 results)

  • [Journal Article] Pulsed Discharge Plasmas in Contact with Water and their Applications2021

    • Author(s)
      Hidenori Akiyama, Masahiro Akiyama
    • Journal Title

      IEEJ Transactions on Electrical and Electronic Engineering

      Volume: 16 Issue: 1 Pages: 6-14

    • DOI

      10.1002/tee.23282

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Study of Conductivity on Hydrogen Peroxide Concentration by High Repetitive Underwater Discharge2020

    • Author(s)
      Daiki Sugawara;Shunsei Kawamura;Hisanori Sone;Masahiro Akiyama
    • Journal Title

      2019 IEEE Pulsed Power & Plasma Science (PPPS)

      Volume: 1 Pages: 1-1

    • DOI

      10.1109/ppps34859.2019.9009723

    • Related Report
      2020 Annual Research Report 2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Sterilization of E. coli in Seawater using Discharge in Water and Dielectric Barrier Discharge2019

    • Author(s)
      H. Sone, M. Akiyama et. al.
    • Journal Title

      IEEE

      Volume: 1 Pages: 1-1

    • DOI

      10.1109/ppps34859.2019.9009711

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Characteristics of discharge plasma in liquid using less than 3 kV2017

    • Author(s)
      Masahiro Hosono, Kazuki Kimura, Masatoshi Fue, Takuma Oikawa and Masahiro Akiyama
    • Journal Title

      Proceedings of 2017 IEEE 21st International Conference on Pulsed Power

      Volume: 印刷中 Pages: 1-4

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Development of high performance pulsed power generator using FPGA and Arduino2017

    • Author(s)
      Seiya Komatsudaira, Ryoma Ogata, Katsuyuki Takahashi, Masahiro Akiyama and Koichi Takaki
    • Journal Title

      Proceedings of 2017 IEEE 21st International Conference on Pulsed Power

      Volume: 印刷中 Pages: 1-4

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Comparison of bubbles due to frequency change and electrode direction in high repetitive plasma in water2017

    • Author(s)
      Kazuki Kimura, Takuma Oikawa, Daiki Sugawara, Masahiro Akiyama and Hidenori Akiyama
    • Journal Title

      Proceedings of 2017 IEEE 21st International Conference on Pulsed Power

      Volume: 印刷中 Pages: 1-4

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] FLEXIBLE CONTROL OF PULSED POWER GENERATOR FOR RESEARCH APPLICATIONS WITH SENSORS2019

    • Author(s)
      Masahiro Akiyama
    • Organizer
      IEEE PPPS2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Sterilization of E.coli in Ballast water using Pulsed Power2019

    • Author(s)
      Masahiro Akiyama
    • Organizer
      IEEE 2019PSPPA
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Development of Pulsed Power Generator's Controller system2019

    • Author(s)
      Shunsei Kawamura, Seiya Komatsudaira, Masahiro Akiyama
    • Organizer
      ISHPMNB 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Influence of change in Conductivity on High Repetitive Discharges in water2019

    • Author(s)
      Daiki Sugawara, Kazuki Kimura, Shunsei Kawamura, Masahiro Akiyama
    • Organizer
      ISHPMNB 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Mikimasa Sugawara, Masahiro Hosono, Masahiro Akiyama2019

    • Author(s)
      Energy Characteristics of Discharge in water using Capacitor Discharge in 3 kV or less
    • Organizer
      ISHPMNB 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Sterilization using Discharge in Water with Changing Conductivity2019

    • Author(s)
      Hisanori Sone, Shunsei Kawamura, Masahiro Akiyama, Katsuyuki Takahashi, Koichi Takaki
    • Organizer
      ISHPMNB 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Sterilization of Yeast and E.coli using Discharge in water2019

    • Author(s)
      曽根久徳,川村俊成,菅原大樹,木村和貴,秋山雅裕
    • Organizer
      平成30年度電気関係学会東北支部連合大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Measurement Concentration of Hydrogen Peroxide produced by High Repetitive Underwater Discharges2019

    • Author(s)
      菅原大樹,木村和貴,川村俊成,秋山雅裕
    • Organizer
      平成30年度電気関係学会東北支部連合大会
    • Related Report
      2018 Research-status Report
  • [Presentation] ArduinoとFPGAを用いたパルスパワー発生装置のコントローラ開発2019

    • Author(s)
      川村俊成,小松平晟矢,秋山雅裕
    • Organizer
      平成30年度電気関係学会東北支部連合大会
    • Related Report
      2018 Research-status Report
  • [Presentation] 3 kV以下でのコンデンサ放電を用いた水中放電のエネルギー特性2019

    • Author(s)
      菅原幹雅,細野雅広,川村俊成,秋山雅裕
    • Organizer
      平成30年度電気関係学会東北支部連合大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Energy Control of Pulsed Power using Embedded System and Magnetic Pulsed Compression Circuits2017

    • Author(s)
      Masahiro Akiyama, Ryoma Ogata, Seiya Komatsudaira and Hidenori Akiyama
    • Organizer
      2017 IEEE 21st International Conference on Pulsed Power
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 高繰り返し水中放電時の放電形態変化の要因に関して2017

    • Author(s)
      及川拓磨,木村和貴,秋山雅裕
    • Organizer
      平成29 年度電気関係学会東北支部連合大会
    • Related Report
      2017 Research-status Report
  • [Presentation] 微細気泡がもたらす水中放電への影響2017

    • Author(s)
      笛 雅俊,秋山 雅裕,高木 浩一,高橋 克幸
    • Organizer
      平成29 年度電気関係学会東北支部連合大会
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2022-01-27  

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