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AssigneeDegremont
InventorsPierre C. Mouchet, Joan-Yves Bergel
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The method, in which the water to be treated is partly oxygenated by a specific aeration carried out before percolation through a biofilter having a bacteria-supporting bed of filtering material, has a measurement stage of at least one parameter constituted by the oxidation-reduction potential of the aerated water before passage into the biofilter, a transmission stage of measurement signals to a computer and comparison of the signal representative of the value of the measured parameter with at least one lower limit set in function of the measurement carried out in a second stage for measuring a parameter representative of the pH and a stage for correcting the air flow by a signal determined by the computer in function of the two preceding stages.
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:
Device for treating waters devoid of dissolved oxygen, characterised in that it comprises an aeration chamber (4) into which the raw water and injected air are brought, the flow of the latter being controlled by a valve (3) allowing controlled aeration under pressure, and whose exit is linked to a biofilter reactor provided with an outlet (7), and with a porous ferro-bacteria supporting bed through which the water to be treated percolates, first measurement means (8) of the pH and second measurement means (9) of the oxidation-reduction potential (Eh) of the aerated water, set between the aeration chamber and the filter, the calculating units (10) taking into account the signals delivered by the first and second measurement means to send a command signal to a means for regulation of the air flow (11, 16) acting on the valve (3) to allow regulation in function of a lower limit and an upper limit for the potential Eh, determined for a given pH value.
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