To provide a waste water treatment technology which has no expense problem of an additive, and can efficiently stably perform oxidation and denitrification of ammonia.
Oxygen is supplied to waste water in presence of nitrifying bacteria and denitrifying bacteria to carry out oxidation treatment where ammonia nitrogen contained in the waste water is converted into nitrite nitrogen by the nitrifying bacteria and denitrification treatment where the nitrite nitrogen and ammonia nitrogen are converted into nitrogen gas by the denitrifying bacteria. While controlling the oxygen supply to the waste water so that a nitrite nitrogen generation rate of the nitrifying bacteria is equal to or less than the treatment capacity of the denitrifying bacteria, the oxidation treatment and denitrification treatment are carried out simultaneously. The treatment rate of the nitrifying bacteria is a rate-limiting factor. Termination of the treatment is detected from the measurement of dissolved oxygen concentration in the waste water.
FUKUNAGA SAKAE
Iwa Saki Kokuni
Kawamata Sumio
Masakazu Ito
Shunichi Takahashi
Toshio Takamatsu
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