Comparison of Nitrate and Nitrite Denitrification Rates of Activated Sludge Samples Collected from Municipal Wastewater Treatment Plants and Analysis of its Denitrifier Community Structure

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  • NITTAMI Tadashi
    Division of Materials Science and Chemical Engineering, Graduate School of Engineering, Yokohama National University
  • OOTAKE Hiroaki
    Division of Materials Science and Chemical Engineering, Graduate School of Engineering, Yokohama National University
  • NAKAMURA Kazuho
    Division of Materials Science and Chemical Engineering, Graduate School of Engineering, Yokohama National University
  • MATSUMOTO Kanji
    Division of Materials Science and Chemical Engineering, Graduate School of Engineering, Yokohama National University

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  • 下水処理活性汚泥の硝酸・亜硝酸イオン脱窒速度の比較とその脱窒細菌群集構造の解析
  • ゲスイ ショリ カッセイ オデイ ノ ショウサン アショウサン イオン ダッチツ ソクド ノ ヒカク ト ソノ ダッチツ サイキン グンシュウ コウゾウ ノ カイセキ

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Abstract

Nitrate and nitrite denitrification rates were analyzed for 12 activated sludge samples collected from municipal wastewater treatment plants. Five of the 12 samples denitrified nitrite more rapidly than they denitrified nitrate. To evaluate the relationship between denitrification rates and denitrifier community structure, we analyzed nitrite reductase genes (nirK and nirS) for two samples. As a result, the activated sludge sample that denitrified nitrate more rapidly than it did nitrite showed large nirS diversity compared with the sample that denitrified nitrite more rapidly than it did nitrate. Moreover, the nirS populations of the two samples were phylogenetically different, although the nirK populations of the two were almost same.

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