生物学的排水処理における硝化活性およびN_2O生成速度に及ぼす水温および窒素負荷の影響

概要

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Activated sludge processes coupled with membrane filters were operated at 10, 20 and 30°C to study the influences of the water temperature, and various kinds of the nitrogen load conditions on nitrification and emission of N2O, known as the greenhouse gas. The results obtained were as follows: Lower temperature, higher nitrogen concentration in the influent and shorter HRT caused the decrease of the nitrification efficiency and the increase of N2O conversion ratio. In addition, the effects of the nitrogen load was higher at low water temperature than high temperature. Under the same condition of the nitrogen load per MLSS, the runs with low MLSS concentration achieved high nitrification rate and low N2O conversion ratio than those with high MLSS concentration. It was suggested that oxygen diffusion was insufficient in the runs with higher MLSS concentration because of the larger-sized flocculation of the microorganisms, and so that effective oxygen supply was very important to improve the nitrification efficiency under such operational condition.
社団法人　日本水環境学会の論文
2001-02-10