Denitrification Treatment of NO3-N Polluted Sea Water by Immobilized Acclimated Marine Denitrifying Sludge.

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  • RYU SOO-LIM
    Department of Environmental Engineering, Faculty of Engineering, Osaka University
  • FURUKAWA KENJI
    Department of Environmental Engineering, Faculty of Engineering, Osaka University
  • FUJITA MASANORI
    Department of Environmental Engineering, Faculty of Engineering, Osaka University

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  • Denitrification Treatment of NO3 N Poll

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Abstract

The preparation of acclimated marine denitrifying sludge (AMDS) with high denitirifying activity from activated sludge obtained from night soil treatment plant employing a sea water dilution system was successful within only one month of acclimatizing period. The optimum pH and temperature for denitrification by the AMDS were 6-8 and 30°C, respectively. AMDS was successfully immobilized by PVA-freezing method. Continuos denitrification experiments of NO3-N polluted synthetic sea water using column type bioreactor packed with these immobilized AMDS were carried out. Maximum allowable NO3-N loading rate to obtain 90% of NO3-N removal was determined experimentally to be 6.0 mg-NO3-N/g-pellet/d.

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