Study on Inactivation Process of Bacillus subtilis by an Underwater Plasma Source with a Porous Membrane

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  • 多孔質膜利用の水中プラズマ源による芽胞菌の不活化過程の検討
  • タコウシツマクリヨウ ノ スイチュウプラズマゲン ニヨル ガホウキン ノ フカツカカテイ ノ ケントウ

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Abstract

Plasma formation in water is considered to be useful for sterilization because hydroxyl radicals are directly produced; therefore, we proposed an underwater plasma source with a porous membrane which functioned in bubble supply and the formation of gas-liquid interface - discharges. In this study, we examined inactivation of Bacillus subtilis and evaluated the inactivation efficiency in plural reaction areas. The results showed that radicals produced at the gas-liquid interface on a porous membrane made a substantial contribution on decomposition for organic matter such as a methylene blue. However, O3 rising bubbles from a porous membrane were responsible for inactivating Bacillus subtilis having resistance period.

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