Abstract: 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 (4) comprising a cylindrical chamber (4a) equipped with blades (4c) rotatably mounted on a shaft (4b) 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 (4) via a network (11) to said dewatering step, and in that it comprises a step of depressurizing said mixer (4) 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.

Abstract: 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 (4) comprising a cylindrical chamber (4a) equipped with blades (4c) rotatably mounted on a shaft (4b) 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 (4) via a network (11) to said dewatering step, and in that it comprises a step of depressurizing said mixer (4) 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.

Abstract: 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.

Abstract: Method and installation of thermal hydrolysis of sludges implementing a group of thermal hydrolysis reactors (71,72,73,74) 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 (71,72,73,74), said step for conveying comprising the continuous passage of the sludges of said batch of sludges into a dynamic mixer (3) into which recovery steam is injected; a step b) for injecting live steam into said thermal hydrolysis reactor (71,72,73,74) 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 (13), and for concomit

Abstract: Installation for the biological treatment of water comprising a sequencing batch reactor (SBR) characterized in that said sequencing batch reactor (1) receives purifying plants (2) provided with at least partially submerged roots (3) and moving hollow carriers (4) made of hard plastic on which a biomass grows.

Abstract: Method for the continuous thermal hydrolysis of sludges containing organic matter, said method comprising the steps of: simultaneously injecting pressurized steam (100) into said sludges and mixing said sludges with said steam by means of a dynamic mixer-injector (4) so as to obtain a single-phase mixture, conveying said single-phase mixture towards a tube reactor (4) under pressure and bringing about the plug flow of this mixture into said reactor for a retention time that is sufficient and at a temperature that is sufficient to enable the thermal hydrolysis of the organic matter present in said sludges, cooling said single-phase mixture at its exit from said tube reactor to a temperature enabling the subsequent digestion of the hydrolyzed organic matter that it contains, depressurizing said cooled single-phase mixture.

Abstract: Method and plant to implement the continuous thermal hydrolysis of sludge to be treated containing organic matter, the method comprising at least: a. a step for de-structuring said sludge to be treated producing de-structured sludge; b. a step for the thermal hydrolysis of said de-structured sludge within a thermal hydrolysis reactor producing hydrolyzed sludge; c. a step for cooling said hydrolyzed sludge; said step for de-structuring consisting in: introducing said sludge to be treated into a dynamic mixer; heating said sludge coming from said dynamic mixer, this heating being obtained by the introduction, into a heat exchanger, on the one hand of said sludge coming from said dynamic mixer and, on the other hand, of said hydrolyzed sludge, this introduction inducing said cooling.

Abstract: Method for dewatering sludge assisted by flocculating reagent, said method comprising an injection of flocculating reagent into the sludge and a step for dewatering said sludge, characterized in that it comprises a preliminary step for mixing (4) said sludge so as to destructure it and reduce its viscosity. Installation for implementing this method.

Abstract: Method and installation of thermal hydrolysis of sludges implementing a group of thermal hydrolysis reactors (71,72,73,74) 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 (71,72,73,74), said step for conveying comprising the continuous passage of the sludges of said batch of sludges into a dynamic mixer (3) into which recovery steam is injected; a step b) for injecting live steam into said thermal hydrolysis reactor (71,72,73,74) 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 (13), and for concomit

Abstract: 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 co-agulant 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.

Abstract: Method and plant to implement the continuous thermal hydrolysis of sludge to be treated containing organic matter, the method comprising at least: a. a step for de-structuring said sludge to be treated producing de-structured sludge; b. a step for the thermal hydrolysis of said de-structured sludge within a thermal hydrolysis reactor producing hydrolyzed sludge; c. a step for cooling said hydrolyzed sludge; said step for de-structuring consisting in: introducing said sludge to be treated into a dynamic mixer; heating said sludge coming from said dynamic mixer, this heating being obtained by the introduction, into a heat exchanger, on the one hand of said sludge coming from said dynamic mixer and, on the other hand, of said hydrolyzed sludge, this introduction inducing said cooling.

Abstract: Method for the continuous thermal hydrolysis of sludges containing organic matter, said method comprising the steps of: simultaneously injecting pressurized steam (100) into said sludges and mixing said sludges with said steam by means of a dynamic mixer-injector (4) so as to obtain a single-phase mixture, conveying said single-phase mixture towards a tube reactor (4) under pressure and bringing about the plug flow of this mixture into said reactor for a retention time that is sufficient and at a temperature that is sufficient to enable the thermal hydrolysis of the organic matter present in said sludges, cooling said single-phase mixture at its exit from said tube reactor to a temperature enabling the subsequent digestion of the hydrolyzed organic matter that it contains, depressurizing said cooled single-phase mixture.

Abstract: Provided is a method for performing thermal hydrolysis of sludge in a cyclic manner. A sludge stream is directed into one reactor during a first cycle and in a second cycle sludge is directed into another reactor. Each reactor has a sludge recirculation loop associated therewith. Flash steam from one reactor is transferred to the other reactor to pre-heat the sludge. The sludge in each reactor is recirculated through the circulation loop during each cycle of thermal hydrolysis. Live steam is directed into each reactor to raise the pressure and temperature within the reactor in order to enable the thermal hydrolysis process to take place.

Abstract: The invention pertains to a method for treating an effluent to be treated in order to reduce its phosphates content, said method comprising a step of anoxic biological treatment of said effluent to be treated, producing a first effluent, a step of aerobic biological treatment of said first effluent, producing a second effluent, a step of recirculating at least a part of said second effluent to the inlet of said anoxic biological treatment step, a step of liquid/solid separation of at least a part of said second effluent, producing a treated effluent and a first denser effluent, a step for producing volatile fatty acids including a wet heat treatment, at a temperature of 100° C. to 350° C.

Abstract: The invention relates to a process of aqueous phase oxidation of effluents, consisting of subjecting said effluents to oxidation in the presence of at least one catalyst and of at least one oxidising agent, at a temperature of between approximately 20.degree. C. and approximately 350.degree. C., under a total pressure of between approximately 1 and approximately 160 bars, in such manner as to mineralise part of the organic matter and total ammoniated nitrogen contained in said effluents, said oxidation being carried out inside a reactor in which a gaseous phase is set up above the liquid phase consisting of said effluents.characterized in that said catalyst is a heterogeneous catalyst placed inside said reactor above the interface between said gaseous phase and said liquid phase.

Abstract: A process of aqueous phase oxidation of effluents, consisting of subjecting the effluents to oxidation in the presence of at least one oxidizing agent inside a reactor having a gaseous phase set up above a liquid phase consisting of the effluents, and subjecting the gaseous phase to catalysis in the presence of at least one heterogeneous catalyst. The oxidation process is carried out at a temperature of between approximately 20.degree. C. and approximately 350.degree. C. under a pressure of between approximately 1 and 160 bars. At least a part of the organic matter and total ammoniated nitrogen contained in the effluents are mineralized. The process includes recycling at least a part of the gaseous phase present in the oxidation reactor after the gaseous phase has passed through the heterogeneous catalyst so as to effectively increase the contact time between the gaseous phase and the heterogeneous catalyst in order to obtain substantial removal of NH.sub.3, COR, and volatile organic compounds.

Abstract: An integrated method for purifying industrial and/or urban effluents containing a large amount of organic material in solution and/or suspension, wherein said effluents are treated in a wet oxidation reactor. The effluents are oxidized in the presence of at least one oxidizing gas to mineralize a large part of the organic material therein by producing a gas phase and an essentially liquid phase mainly containing soluble residual organic material, as well as an essentially inorganic solid phase in suspension. The essentially liquid phase from the reactor is subjected to liquid/solid separation to separate the solid phase, and at least a fraction of the separated solid phase is recycled in the wet oxidation reactor. Various alternative embodiments of the method include adding a catalyst and/or an agent for acidifying the recycled solid phase fraction. The facility may operate continuously or semi-continuously between interruptions.