炭素陰極を用いた電気分解による水素を利用した脱窒反応装置の速度解析  [in Japanese] Nitrate Removal Rate in a Continuous Column Denitrification Reactor Using Hydrogen Generated by Electrolysis with Carbon Anodes and Stainless Cathodes  [in Japanese]

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Abstract

金沢大学理工研究域自然システム学系An autotrophic continuous denitrification process, using hydrogen generated by electrolysis with activated carbon anodes, were experimentally demonstrated to be an effective nitrate removal process. Several fixed bed columns with polypropylene packing and honey-come shaped activated carbon anodes and stainless rod cathodes were set in thermostat chamber of 30°C, and then potassium nitrate enriched tap water, nitrogen concentration of 30mg-N·l-1, was supplied at various flow rates and electric currents. Although the anode is in the same column where microbes grow, sufficient nitrate removal was observed. For example, 94% of nitrate was removed at the HRT of as short as 1.8h for an electrical current of 6mA. A model assuming successive nitrate and nitrite reductions and plug-flow process, nitrate reduction rate=k1[NO3-][H2], and nitrite reduction rate=k2[NO2-][H2]1.5 was constructed. Calculated results with k1=1.3l·mmol-1·h-1 and k2=3.3l1.5·mmol-1.5·h-1 agreed well with the all the experimental results.

An autotrophic continuous denitrification process, using hydrogen generated by electrolysis with activated carbon anodes, were experimentally demonstrated to be an effective nitrate removal process. Several fixed bed columns with polypropylene packing and honey-come shaped activated carbon anodes and stainless rod cathodes were set in thermostat chamber of 30°C, and then potassium nitrate enriched tap water, nitrogen concentration of 30mg-N·<i>l</i><sup>-1</sup>, was supplied at various flow rates and electric currents. Although the anode is in the same column where microbes grow, sufficient nitrate removal was observed. For example, 94% of nitrate was removed at the HRT of as short as 1.8h for an electrical current of 6mA. A model assuming successive nitrate and nitrite reductions and plug-flow process, nitrate reduction rate=<i>k</i><sub>1</sub>[NO<sub>3</sub><sup>-</sup>][H<sub>2</sub>], and nitrite reduction rate=<i>k</i><sub>2</sub>[NO<sub>2</sub><sup>-</sup>][H<sub>2</sub>]<sup>1.5</sup> was constructed. Calculated results with <i>k</i><sub>1</sub>=1.3<i>l</i>·mmol<sup>-1</sup>·h<sup>-1</sup> and <i>k</i><sub>2</sub>=3.3<i>l</i><sup>1.5</sup>·mmol<sup>-1.5</sup>·h<sup>-1</sup> agreed well with the all the experimental results.

Journal

  • Journal of Japan Society on Water Environment

    Journal of Japan Society on Water Environment 24(7), 454-458, 2001-07-10

    Japan Society on Water Environment

References:  14

Codes

  • NII Article ID (NAID)
    10008005231
  • NII NACSIS-CAT ID (NCID)
    AN10372439
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    09168958
  • NDL Article ID
    5839430
  • NDL Source Classification
    ZN5(科学技術--建設工学・建設業--都市工学・衛生工学)
  • NDL Call No.
    Z16-1045
  • Data Source
    CJP  NDL  IR  J-STAGE 
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