VFEU Water Quality Control in STS-95 Mission.

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  • Uchida Satoko
    National Space Development Agency of Japan, 2-1-1 Sengen, Tsukuba, Ibaraki 305-8505, Japan
  • Matsubara Shoji
    National Space Development Agency of Japan, 2-1-1 Sengen, Tsukuba, Ibaraki 305-8505, Japan
  • Kato Mitsuyasu
    National Space Development Agency of Japan, 2-1-1 Sengen, Tsukuba, Ibaraki 305-8505, Japan
  • Sakimura Toru
    Mitsubishi Heavy Industries, Ltd. Kobe Shipyard & Macheinery Works, 1-1-1 Wadasaki-cho, Hyogo-ku, Kobe 605-8585, Japan
  • K. Nakamura Hiroshi
    Mitsubishi Heavy Industries, Ltd. Takasago R&D Ctr., 2-1-1 Shinhama, Arai-cho, Takasago 676-8686, Japan
  • Ogawa Naoki
    Mitsubishi Heavy Industries, Ltd. Takasago R&D Ctr., 2-1-1 Shinhama, Arai-cho, Takasago 676-8686, Japan
  • Nagaoka Shunji
    Department of Physiology, Fujita Health University School of Health Science, Toyoake, Aichi 470-1192, Japan

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Abstract

In STS-95 Space Shuttle mission, an aquatic animal research facility, Vestibular Function Experiment Unit (VFEU), was flown to perform neurobiological experiment with marine fish, oyster toadfish. For this purpose, we have developed a sea water purification system using highly active nitrifying bacteria at low temperature. With this system, the water quality in the VFEU was maintained in sufficient condition to keep the toadfish in healthy state for 9 days of the mission. This report summarizes the efficiency of the filter system based on the results from pre-flight bacterial preparation, water analysis of samples taken during flight, and the post-flight analysis of the bacterial filter.

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