Shen and Hirayama established a bioreactor system for denitrification, in which the photosynthetic bacterium, R. sphaeroides, was immobilized using the PVAboric acid method (6). However, they did not report on nitrite accumulation levels. In addition, the purification of wastewater by PVA-immobilized activated sludge has also been noted, but there is no report about nitrite accumulation to date (8, 9).
Shen and Hirayama established a bioreactor system for denitrification, in which the photosynthetic bacterium, R. sphaeroides, was immobilized using the PVAboric acid method (6). However, they did not report on nitrite accumulation levels. In addition, the purification of wastewater by PVA-immobilized activated sludge has also been noted, but there is no report about nitrite accumulation to date (8, 9).
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