Musty and earthy odor compounds including 2,4,6-trichloroanisole in treated wastewater

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  • URASE Taro
    School of Bioscience and Biotechnology, Tokyo University of Technology
  • TSUTSUI Hirofumi
    School of Bioscience and Biotechnology, Tokyo University of Technology

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  • 下水処理水に含まれる2,4,6-TCAなどのカビ臭物質
  • ゲスイ ショリスイ ニ フクマレル 2,4,6-TCA ナド ノ カビシュウ ブッシツ

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<p>Biologically treated wastewater still has earthy and musty odor, possibly caused by 2,4,6-trichloroanisole (2,4,6-TCA). A gas chromatography - olfactometry analysis detected the presence of odorous constituents such as 2-MIB, geosmin, 2,4,6-trichloroanisole, 2-isobutyl-3-methoxypyrazine and other unidentified compounds. The monitoring for more than 24 treatment plants showed that the concentration of 2,4,6-TCA in treated wastewater had a positive correlation with odor intensity. A labo-scale activated sludge reactor simulating a case of off-gas treatment by sodium hypochlorite showed the production of 2,4,6-trichlorophenol, which is a precursor of 2,4,6-trichloroanisole.</p>

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