Denitrification of Nitrified Wastewater by a Bio-electro Process.

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  • ZHAO Zhe-shi
    Department of Civil Engineering, Maebashi Institute of Technology
  • OZAKI Masuo
    Department of Civil Engineering, Maebashi Institute of Technology
  • KURODA Masao
    Department of Civil Engineering, Gunma University

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Other Title
  • バイオエレクトロ法による下水処理水からの硝酸態窒素の除去
  • バイオエレクトロ法による下水処理からの硝酸態窒素の除去
  • バイオエレクトロホウ ニヨル ゲスイ ショリ カラ ノ ショウサンタイ チッソ

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Abstract

Denitrification of nitrified wastewater was investigated by using a bioelectro reactor which consisted of immobilized denitrifying bacteria electrode as cathode and carbon electrode as anode.<br>Experiments were performed to investigate the effects of electric current, influent nitrate concentration, HRT and ORP on the denitrification rate, nitrite production and hydrogen utilization.<br>The denitrification rate and hydrogen utilization were varied with mol ratio (λ) of hydrogen and nitrate which were supplied to the bio-electro reactor, and those muximum values were observed at λ=1.4. Nitrate remained under λ=1.4 in the effluent, and residual hydrogen occurred upper λ=1.4.<br>The nitrite production was not effected by change of λ value and ORP and DO have to control in the proper values because nitrite production was enhanced in the higher value ranges of ORP and DO.

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