High Performance Aerobic Digestion of Organic Sludge using a Pilot-scale Mesh-filtration Bioreactor

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  • Kamimoto Yuki
    Department of Ecological Engineering, Toyohashi University of Technology
  • Kiso Yoshiaki
    Department of Ecological Engineering, Toyohashi University of Technology
  • Oguchi Tatsuo
    Department of Ecological Engineering, Toyohashi University of Technology
  • Hu Hongying
    Department of Environmental Science and Engineering Tsinghua University
  • Hosotani Takuya
    Tohkemy Co. Ltd.

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Other Title
  • パイロット規模のメッシュろ過バイオリアクターによる余剰汚泥の高効率好気性消化に関する研究
  • パイロット キボ ノ メッシュ ロカ バイオリアクター ニ ヨル ヨジョウ オデイ ノ コウコウリツ コウキセイ ショウカ ニ カンスル ケンキュウ

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Treatment of excess sludge is an important problem to be solved even for small and middle-scale domestic wastewater treatment facilities. Therefore, effective sludge reduction technologies have been needed. In this work, we focused on the development of an effective aerobic digestion process for the reduction of sludge and employed a pilot-scale mesh-filtration bioreactor (MFBR), in which mesh-filtration units were submerged in the aeration tank. Reactor-A (working volume: 0.1m3) was used to examine the filtration performance considering the following points: the structure of the mesh-module and the filtration protocol. Reactor-B (working volume: 1m3) received the return sludge in a domestic wastewater treatment facility (Johkasou) in our institutionThe SS removal performance was examined, with the sludge fed once each day and filtration conducted every hour. In the latter half of the experimental period (Phase-3), a very high MLSS concentration (~30g/L) was maintained, and 91.2% of the fed SS was reduced under the following conditions: HRT=14.2 days, 0.0237kg−SS/kg−MLSS/d loading rate, 8.7-23°C. The percent of the CODCr (particulate and dissolved) removed from the fed sludge was 88.8%, and the level of dissolved CODCr of the effluent was about 50mg/L. In addition, 85% of the T-N was also removed from the fed sludge.

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