Veolia Water Solutions & Technologies Support

Omnium De Traitements Et De Valorisation

Otv Omnium De Traltements Et De Valorisation S.a.

Malik Djafer

Francis Luck

Jacques Sibony

Julien Chauzy

Cedric Crampon

Abdelkader Gaid

Delia Pastorelli

Cédric Crampon

Éric Guibelin

Sludge dewatering process assisted by flocculating reactant, said process comprising an injection of flocculating reactant into the sludge and a step of dewatering said sludge, characterized in that it comprises a preliminary step that consists in mixing said sludge in a mixer () comprising a cylindrical chamber () equipped with blades () rotatably mounted on a shaft () rotating at a speed of rotation of between 500 rpm and 4000 rpm, so as to destructure the sludge and reduce the viscosity thereof, and in discharging the sludge from said mixer () via a network () to said dewatering step, and in that it comprises a step of depressurizing said mixer () and said network giving rise to the lysis, by cavitation, of said sludge, said depressurizing step being carried out over a period of at least 0.1 second. Corresponding plant.

Sludge dewatering process assisted by flocculating reactant and plant for the implementation of such a process

A water or wastewater treatment process that includes a dissolved air flotation process for removing suspended solids from influent water or mixed liquor. In one process, the dissolved air flotation process is carried out in the absence of adding a coagulant or a flocculant, but yet produces TSS removal efficiencies comparable to those achieved by conventional dissolved air flotation processes that employ a coagulant and a flocculant. In other processes, a coagulant and/or a flocculant is added directly to the mixing zone of a dissolved air flotation system or is added via a pressurized white water injection system. In another process, the use of a coagulant and a flocculant is useful in removing TSS and reducing the concentration of phosphorus in the water being treated.

Water treatment process employing dissolved air flotation to remove suspended solids

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

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

Process and installation for the treatment of effluents by oxidation and

Process and installation for the treatment of effluents by oxidation in

Method and facility for treating effluents loaded with organic material,

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Boulogne-Billancourt, France

Malik Djafer