A method for oxidizing organic matter contained in an aqueous effluent and an
installation
for implementing the method. The method comprises the following steps: injecting
into a tubular body the aqueous effluent; bringing the aqueous effluent to a pressure
P1, corresponding to the critical pressure of the aqueous effluent; bringing
the aqueous effluent to a temperature T1; and injecting into the tubular
body at n points spaced apart from one another, n fractions of at least an oxidizing
composition, so that a portion of the thermal energy produced by the oxidation
reaction increases the temperature of the reaction mixture from said temperature
T1 to temperature T2T1 according to an increasing curve,
whereby the organic matter is oxidized, the reaction mixture continuously developing
from a sub-critical liquid state to the supercritical domain.