Influence of Operating Factors on Advanced Oxidation Performance of an Electrochemical Flow Cell Using a Fenton-type Reaction

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  • NAKAMURA Yu
    Department of Environmental Solution Technology, Graduate School of Science and Technology, Ryukoku University
  • KISHIMOTO Naoyuki
    Department of Environmental Solution Technology, Faculty of Science and Technology, Ryukoku University
  • KATO Masaaki
    Okayama Works, Permelec Electrode Ltd.
  • OTSU Hideo
    Okayama Works, Permelec Electrode Ltd.

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  • フェントン型反応を用いた電解フローセル反応器の促進酸化性能に及ぼす運転操作因子の影響
  • フェントンガタ ハンノウ オ モチイタ デンカイ フローセル ハンノウキ ノ ソクシン サンカ セイノウ ニ オヨボス ウンテン ソウサ インシ ノ エイキョウ

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Abstract

The effect of operating factors on the advanced oxidation performance of an electrochemical flow cell by the Fenton-type reaction of ferrous ion (Fe2+) and hypochlorous acid (HOCl) was discussed in this research. As a result of the research, the balance between the generation rates of Fe2+ and HOCl was found to be of critical importance in the overall current efficiency (CE) of the process. The linear velocity of flow water on the electrodes affected the CE through the change in diffusion flux. A rise in linear velocity enhanced the diffusion flux and CE, but extremely high linear velocity degraded the CE owing to reverse reactions on counter electrodes. An increase in iron concentration also enhanced the CE as a result of the enhancement of Fe2+ regeneration, but iron concentration greater than 27.5 mM deteriorated the CE because of the formation of a brown deposit on the cathode. The current density directly affected the balance between the Fe2+ and HOCl generation rates. The increase in current density enhanced the CE of HOCl production, but deteriorated the CE of Fe2+ regeneration. Accordingly, a decrease in the areal ratio of the anode to the cathode was effective in improving the overall CE.

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