Nitrification of NH_4-N Pollured Sea Water by Immobilized Acclimated Marine Nitrifying Sludge (AMNS)

概要

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Acclimated marine nitrifying sludge (AMNS) prepared from activated sludge obtained from a night soil treatment plant equipped with a sea water dillution system for controlling the reactor's temperature was successfully immobilized using a polyvinyl alcohol (PVA) freezing method. About 2 weeks of recovery culture was required before continuous treatment could be carried out. Transmittance electron microscopic observations of sliced immobilized AMNS pellets incidated that bacteria with an intracytoplasmic membrane domicinated the AMNS colony. Continuous nitrification experiments of NH_4-N containing synthetic sea water were carried out in a 1.2 l bioreactor containing 57.2g (wet weight) of immobilized AMNS pellets. The NH_4-N removal rate reached a saturation level above an NH_4-N loading rate of 1.5 mg-NH_4-N/g-pellet/d. The maximum allowable NH_4-N loading rate necessary to obtain 90% NH_4-N removal was found to be 1.0 mg-NH_4-N/g-pellet/d. It was possible to store the immobilized AMNS peletts in a refrigerator for at least 1 week without loss of nitrifying capability. Inorganic carbon source shown to be a limiting factor in the continuous nitrification experiments. The maximum allowable NH_4-N loading rate needed to obtain 90% MH_4-N removal increased to 2.0 mg-NH_4-N/g-pellet/d through supplementation of an inorganic carbon (IC) source to the influent synthetic sea water.
社団法人日本生物工学会の論文
1993-12-25