Patent ID: 6527956
Filing Date: 2003-03-04
Classification: C02F,Y02W,Y10S

Abstract:
A process for regulating the aeration in a biological wastewater treatment plant using a carbon removal stage, a nitrification stage and a denitrification stage, comprising the following steps:continuously measuring the value of oxidation-reduction potential of the treated medium; measuring oxygen concentration of the treated medium during aeration phases; maintaining aeration if the oxygen concentration falls within a preselected reference range; reducing the aeration if the oxygen concentration is above the preselected reference range; increasing the aeration if the oxygen concentration falls below the preselected reference range; and comparing the oxygen concentration in the treated medium with the preselected reference range during a transition of the oxidation-reduction potential (partial nitrification/total nitrification); and adjusting the reference range of oxygen concentration to a new set of values to correct the oxygen concentration toward a preselected desired level.