Closed Water Recirculation System for Fish Rearing Equipped with Bioreactor Capable of Simultaneous Nitrification and Denitrification

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  • Uemoto Hiroaki
    Bio-science Department, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko-city, Chiba 270-1194, Japan
  • Watanabe Atsushi
    Bio-science Department, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko-city, Chiba 270-1194, Japan
  • Saitoh Shin
    Frontier Technology Survey Department, Toray Research Center, 1-8 Nihonbashi-Muromachi, 3-chome, Chuo-ku, Tokyo 103-0022, Japan
  • Kondo Tsuneyuki
    Frontier Technology Survey Department, Toray Research Center, 1-8 Nihonbashi-Muromachi, 3-chome, Chuo-ku, Tokyo 103-0022, Japan
  • Matuki Yoshiyuki
    Energy Plant Department, Toray Engineering, 4845 Mishima-city, Shizuoka 411-8691 Japan
  • Masukawa Mitsuyo
    Space Utilization Research Center, National Space Development Agency of Japan, 1-1 Sengen, 2chome, Tsukuba-city, Ibaraki 305-8505, Japan
  • Matsumura Haruhiko
    Department of Environment assessment, Bio-environment Research, 1646 Abiko, Abiko-city, Chiba 270-1194, Japan
  • Koike Yuichi
    Department of Environment assessment, Bio-environment Research, 1646 Abiko, Abiko-city, Chiba 270-1194, Japan

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  • Closed water recirculating system for fish rearing equipped with bioreactor capable of simultaneous nitrification and denitrification.

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Five crucian carp, Carassius auratus langsdorfiicarps had been reared in a closed water recirculating system. The system was equipped with the compact bioreactor using the plate gels capable of both nitrification and denitrification in a single unit. Ammonia and nitrite concentrations in the rearing water had been maintained below 0.05 mg-N⁄L, and nitrate concentration also controlled between 2 and 8 mg-N⁄L with the bioreactor. As concerns nitrogen budget in the closed system, 95.0 % of nitrogen income from feed was lost as nitrogen gas from the closed system. All fish was alive for 91 days without any unusual behavior. Thus, the bioreactor performed both nitrification and denitrification abilities enough to rear the five fish for 91 days. The bioreactor using the plate gels would be effective to simplify the closed system both physically and operationally, since it can remove the ammonia excreted from fish as nitrogen gas by a single step.

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