Patent ID: 8916046

Claim:
A method of regulating the oxygen supply into a basin for the biological treatment of wastewater by alternating aeration comprising successive cycles, each cycle comprising an aeration first phase, for oxidizing especially the carbon and nitrogen compounds using aerobic bacteria, and an anoxic second phase, for reducing the nitrites and nitrates formed during the preceding aeration phase, the method comprising: providing at least one ammoniacal nitrogen measurement sensor and one nitrate measurement sensor in one of the liquor of the basin or in the liquor that leaves the basin; actuating, a supply of oxygen in the aeration phase on the basis of the following operating event: the rate of decrease of the nitrate measurement drops below a low threshold; and stopping the supply of oxygen in the aeration phase when at least one of the following triggering events occurs: the rate of decrease of the ammoniacal nitrogen measurement drops below a low threshold; and the sum of the ammoniacal nitrogen and nitrate measurements exceeds a high threshold.