Patent ID: 6083398
Filing Date: 2000-07-04
Classification: C02F,Y10S

Abstract:
Process for the decoloration and the detoxification of aqueous effluents by an oxidation treatment of the effluents by hydrogen peroxide, continuously and in a homogeneous phase, at a pH of 2 to 5 in the presence of Fe ions and under irradiation by means of UV radiation, whereina) the effluent to be treated is coloured and resistant and highly polluted and exhibits a chemical oxygen demand (COD) of not less than 100 mg/l,b) the ratio by weight of the concentration of active oxygen (AvOx) (expressed as mg oxygen/l) of the homogeneous phase to the COD of the effluent (expressed as mg/l) is not less than 0.5:1,c) the ratio by weight of the AvOx of the homogeneous phase (expressed as mg oxygen/l) to the concentration of Fe ions (expressed as mg Fe/l) is not less than 50:1;whereinthe oxidation treatment is carried out at a temperature of 50 to 80.degree. C.;the concentration of Fe ions which is employed is not less than 5 mg/l and not greater than 50 mg/l; andthe oxidation treatment is carried out for a duration of greater than or equal to 5 min and less than 120 min, to produce a treated effluent which exhibits a decoloration of at least 99%.