High Organic Loading Treatment of Synthetic Soy-sauce Production Wastewater Using a Combined System Consisting of a Psychrophilic (20 ºC) UASB Reactor and a DHS Reactor at Ambient Temperature

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  • KURODA Kyohei
    Department of Urban Environmental Design and Engineering, National Institute of Technology, Kagoshima College Department of Creative Engineering, National Institute of Technology, Kitakyushu College Department of Energy and Environment Science, Nagaoka University of Technology
  • TOBO Atsushi
    Department of Urban Environmental Design and Engineering, National Institute of Technology, Kagoshima College
  • HATAMOTO Masashi
    Top Runner Incubation Center for Academia-Industry Fusion, Nagaoka University of Technology
  • YAMAGUCHI Takashi
    Department of Science of Technology Innovation, Nagaoka University of Technology
  • WATANABE Norikazu
    Benears Co.,Ltd.
  • NANJO Tadahiko
    Benears Co.,Ltd.
  • YAMAUCHI Masahito
    Department of Urban Environmental Design and Engineering, National Institute of Technology, Kagoshima College
  • YAMADA Masayoshi
    Department of Urban Environmental Design and Engineering, National Institute of Technology, Kagoshima College

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Other Title
  • 低温 (20 ºC) UASB反応器と常温DHS反応器を組み合わせたシステムによる模擬醤油製造廃水の高負荷連続処理
  • 気温(20℃)UASB反応器と常温DHS反応器を組み合わせたシステムによる模擬醤油製造廃水の高負荷連続処理
  • キオン(20℃)UASB ハンノウキ ト ジョウオン DHS ハンノウキ オ クミアワセタ システム ニ ヨル モギ ショウユ セイゾウ ハイスイ ノ コウフカ レンゾク ショリ
  • High Organic Loading Treatment of Synthetic Soy-sauce Production Wastewater Using a Combined System Consisting of a Psychrophilic (20 ºC) UASB Reactor and a DHS Reactor at Ambient Temperature

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Abstract

To establish an effective soy-sauce production wastewater treatment system, we designed a combined system consisting of a psychrophilic (20 ºC) up-flow anaerobic sludge blanket (UASB) reactor and a down-flow hanging sponge (DHS) reactor under ambient temperature. The COD removal rate of 87±7％ was achieved at a 26±3.6 kgCOD m-3 d-1 organic loading rate (6,500±900 mgCOD L-1 as influent synthetic soy-sauce based wastewater) in the UASB reactor. 16S rRNA gene sequence analysis revealed that syntrophs belonging to class Deltaproteobacteria, phylum Firmicutes, and phylum Thermotogae, Bacteria belonging to phylum Synergistetes, and methanogens mainly degrade approximately 40％ of the COD of soy-sauce-based synthetic wastewater in the UASB reactor. Syntrophic associations require low hydrogen partial pressure because of the difficulty of this reaction. Therefore, this study revealed that the UASB-DHS system can be applied to real soy-sauce production wastewater containing high organics and sodium concentrations because syntrophic associations were well developed.

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