Veolia Water Solutions & Technologies Support

Julien Chauzy

Cedric Crampon

Malik Djafer

Romain Lemaire

Thierry Aupetit

Andrew B Gilbert

Kim Sorensen

Frédéric Veuillet

Method and installation of thermal hydrolysis of sludges implementing a group of thermal hydrolysis reactors () characterized in that it comprises successions of cycles, each of these successions of cycles being dedicated to one of said thermal hydrolysis reactors, each cycle comprising: a step a) for conveying a batch of non-preheated sludges to be treated into a thermal hydrolysis reactor (), said step for conveying comprising the continuous passage of the sludges of said batch of sludges into a dynamic mixer () into which recovery steam is injected; a step b) for injecting live steam into said thermal hydrolysis reactor () containing said batch of sludges so as to increase the temperature and the pressure prevailing in this reactor; a step c) of thermal hydrolysis of the batch of sludges in the thermal hydrolysis reactor; a step d) for emptying the content of the batch of hydrolyzed sludges of said thermal hydrolysis reactor towards a recovery vessel (), and for concomitant de-pressurizing of said reactor prompting the emission of recovery steam from the recovery vessel (); the cycle starting points of the successions of cycles being staggered in time so that the steps a) of a succession of cycles are concomitant with the steps d) of another succession of cycles, the recovery steam emitted during the steps d) of a succession of cycles constituting the recovery steam injected during the steps a) of another succession of cycles.

Process and plant for thermal hydrolysis of sludge

Method for the continuous thermal hydrolysis of sludges containing organic matter, said method comprising the steps of:

Process and device for continuous thermal hydrolysis

The invention pertains to a method for the continuous thermal hydrolysis of sludge to be treated, containing organic matter, said method comprising the steps of simultaneously carrying out the injection of recovered steam into said sludge and mixing said sludge with said recovered steam by means of a primary dynamic injector-mixer so as to obtain a primary uniform mixture; simultaneously carrying out the injection of fresh steam into said primary uniform mixture and mixing said primary uniform mixture with said fresh steam by means of a secondary dynamic injector-mixer so as to obtain a secondary uniform mixture of sludge; conveying said secondary uniform mixture towards a tube reactor under pressure and prompting an essentially plug-type flow of this secondary uniform mixture into said reactor for a residence time that is sufficient and at a temperature that is sufficient to enable the thermal hydrolysis of the organic matter present in this secondary uniform mixture; producing said recovery steam within means for the production of recovered steam from said secondary uniform mixture obtained at exit from said tubular reactor; cooling said secondary uniform mixture when it exits said means for producing recovery steam to a temperature enabling the subsequent digestion of the hydrolyzed organic matter that it contains.

Method for continuous thermal hydrolysis with recirculation of recovered steam

Method and plant to implement the continuous thermal hydrolysis of sludge to be treated containing organic matter, the method comprising at least:

Method for the continuous thermal hydrolysis of sludge with a high dryness value

The invention relates to a method for treating water laden with nitrogen in the form of ammonium by means of nitritation-denitritation, wherein said method includes at least: a first step (i) of supplying at least one sequential biological reactor () with said water; an aerated nitration step (ii); an anoxia denitritation step (iii); and a step (iv) of extracting treated water from said reactor. According to the invention, the method also includes the in-line measurement of the nitrite concentration of said water in said reactor, and at least one monitoring step of at least one step of the method, said monitoring step taking into account the results from said in-line measurement of the nitrite concentration.

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Antony, France

Julien Chauzy