Development and Evaluation of Newly Designed Coaxial Cylindrical Plasma Reactor with Liquid Flow Control and Post-Discharge Reactions for Water Treatment

Kosuke Tachibana, Ryosuke Hanabata, Takashi Furuki, Ryuta Ichiki, Seiji Kanazawa and Marek Kocik
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Kosuke Tachibana: Department of Innovative Engineering, Oita University, 700 Dannoharu, Oita 870-1192, Japan
Ryosuke Hanabata: Department of Innovative Engineering, Oita University, 700 Dannoharu, Oita 870-1192, Japan
Takashi Furuki: Department of Innovative Engineering, Oita University, 700 Dannoharu, Oita 870-1192, Japan
Ryuta Ichiki: Department of Innovative Engineering, Oita University, 700 Dannoharu, Oita 870-1192, Japan
Seiji Kanazawa: Department of Innovative Engineering, Oita University, 700 Dannoharu, Oita 870-1192, Japan
Marek Kocik: Institute of Fluid Flow Machinery, Polish Academy of Sciences, Fiszera 14, 80-231 Gdańsk, Poland

Energies, 2022, vol. 15, issue 11, 1-15

Abstract: Water purification by non-equilibrium atmospheric pressure plasma has attracted much attention and is expected to be a next-generation method. However, general approaches to improve the energy efficiency of the water purification have not been revealed. Therefore, to investigate important factors for increasing its energy efficiency, we developed coaxial cylindrical plasma reactors where pulsed streamers were generated between a high-voltage electrode and running water film. To evaluate the performance of the plasma reactors, we measured hydroxyl (OH) radicals in solution based on a chemical probe method using disodium terephthalic acid (NaTA) and decolorized indigo carmine solution. Our experimental results showed that the production rate of the OH radicals was approximately 20 nmol/s and that the energy efficiency of the decolorization was on the order of 10 g/kWh. In addition, we found that controlling liquid flow based on the Coandă effect and introducing the intermittent operation of the streamer discharges to use post-discharge reactions increased the energy efficiency by a factor of approximately 3.5, which indicated that these approaches are effective to improve the performance of the water purification by plasma.

Keywords: non-equilibrium plasma; pulsed streamer; water film; OH radical; chemical probe method; Coand? effect; post-discharge reaction; water treatment (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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