Patent ID: 6569336
Filing Date: 2003-05-27
Classification: C02F,G05D,Y02W

Abstract:
Method for elimination by biological route of metallic elements present in the ionized state in water devoid of dissolved oxygen, in which the water to be treated is partially oxygenated by a specific aeration carried out before percolation through a biofilter reactor with a bacteria-supporting bed of filtering material, characterised in that it comprises:a measurement stage for at least one parameter constituted by the oxidation-reduction potential (Eh) of the aerated water before passage into the biofilter; a transmission stage of measurement signals to a computer and comparison with the signal representative of the value of at least one parameter measured for at least one lower limit of this parameter determined in function of the measurement carried out in a second stage of measurement of a second parameter representative of the pH and a possible stage for correction of the air flow by control by a unit (3, 10, 11) for adjusting the air flow by a signal determined by the computer in function of the two preceding stages.