Centre National De La Recherche Scientifique

Innovex, Inc.

Innoveox

François Cansell

Manuel Bottreau

Stefan Mecking

Cyril Aymonier

Jean-Michel Tauzia

Marie Gaudre

Bernard Chevalier

Nathalie Daro

Jean-François Letard

Victor Martinez

Jean Etourneau

Vincent Pessey

Sandy Moisan

Sabine Saint-Martin

François Weill

Hydrothermal oxidation of organic compounds, optionally with oxidizable inorganic compounds, is contained in an aqueous effluent. The aqueous effluent is injected within a tubular reactor and brought to supercritical pressure, and temperature is increased to a supercritical temperature, without any intermediate decrease in temperature, by introducing sufficient amounts of oxidizing agent within the tubular for totally oxidizing the organic compounds, and optionally for partly oxidizing oxidizable inorganic compounds. The oxidizing agent is introduced in a fractionated way in several points increasingly located downstream, and the composition and/or the concentration of the organic compounds and/or oxidizable organic compounds within the effluent to be treated varies over time. Further, upstream from the tubular reactor where oxidation is carried out, the effluent's total chemical oxygen demand of the effluent to be treated is measured and monitored at more than 120 grams/liter (g/L) and less than 250 g/L prior to injecting the tubular reactor.

Process for treating waste via hydrothermal treatment

The invention relates to a method of preparing a particle-based composition, comprising: (i) bringing into contact a mixture comprising a dendritic structure and a metal compound precursor in a fluid, under temperature and pressure conditions such that the mixture is not soluble in the fluid; and (ii) chemically converting the metal compound precursor.

Synthesis of particles in dendritic structures

The invention relates to a method for processing an aqueous effluent (E) containing in solution at least one type of metal (M) nitrite or nitrate whose oxide is stable in an aqueous medium consisting (I) in introducing cations NH+ in aqueous solution, generally in the form of an aqueous ammonia solution, into the aqueous effluent and, subsequently (II) in processing the obtainable medium at a temperature ranging from 100 to 700&#xb0; C. and a pressure of 1-50 MPa (i.e. from 10 to 500 bar), thereby converting the metal (M) nitrite or nitrate into metal (M) oxide, nitrogen and water.

Method for processing aqueous effluents containing metal nitrate or nitrite salts

A method for starting up a system for oxidating organic bodies. The system includes a tubular body wherein an aqueous body is injected into the inlet thereof at a pressure Pthe tubular body having a first zone extending the inlet thereof, a second zone into which an oxidating compound can be injected into the output thereof. The inventive method includes the following steps: a first amount of thermal energy Qis provided in the first zone, the amount of thermal energy being able to raise the temperature of the liquid flowing through the tubular body from an initial temperature to a higher temperature Tand a determined amount of a combustible mixture which can react at the intermediate temperature Tin order to provide an amount of thermal energy Qbringing the temperature of the liquid to a reaction temperature Tis injected.

System for oxidation of organic bodies present in an aqueous effluent

A method for starting up a system for oxidating organic bodies. The system includes a tubular body wherein an aqueous body is injected into the inlet thereof at a pressure Pthe tubular body having a first zone extending the inlet thereof, a second zone into which an oxidating compound can be injected into the output thereof. The inventive method includes the following steps: a first amount of thermal energy Qis provided in the first zone, the amount of thermal energy being able to raise the temperature of the liquid flowing through the tubular body from an initial temperature to a higher temperature T; and a determined amount of a combustible mixture which can react at the intermediate temperature Tin order to provide an amount of thermal energy Qbringing the temperature of the liquid to a reaction temperature Tis injected.

Method for starting up a system for treating waste by hydrothermal oxidation

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 Pcorresponding to the critical pressure of the aqueous effluent; bringing the aqueous effluent to a temperature Tand 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 Tto temperature T&#x3e;Taccording 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.

Method for treating waste by hydrothermal oxidation

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Pessac, France

François Cansell