間欠曝気式窒素除去法における処理水質の経時間的変化〔間欠曝気式高率窒素除去法に関する研究-2-〕

概要

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In order to confirm the changes in the qualities of treatment water and to determine the optimum treatment conditions in the nitrogen removal with intermittent aeration, investigations were carried out in small tanks. High, middle, and low concentrations of artificial wastewaters were used as influents, and these wastewaters were treated with the retention times of 3, 1.5, and 0.25 days, respectively. The results showed several changes in the qualities of treatment water under the optimum conditions of treatment in which the high removal rates of nitrogen were obtained: In one cycle (from the inflow of wastewater to the effluence of supernatant fluid after treatment), 1) the ammonia-N concentration in the treatment water was low at the early and the final stages and was high at the middle stage of the cycle, 2) the concentration of total inorganic N in treatment water at the final stage was very low as compared with that of total N in the influent wastewater, and 3) the ratios of nitrate-N to ammonia-N in treatment water at the final stage and in the supernatant fluid after treatment were near 1.
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