Degremont

Ondeo Degremont

Michel Cordier

Sylvie Baig

Chrystelle Langlais

Herve Labaquere

Gilbert Saint-Dizier

Alain Truc

A method for treating waste water uses a membrane bioreactor that produces excess biological sludge and treated water components. This is achieved by extracting the biological sludge from the bioreactor then causing contact between the biological sludge and dewatered effluent to form two resulting products. The first product contains polyclectrolyte loaded sludge. Polyelectrolyte is continually added to the polyelectrolyte loaded sludge during dewatering to separately form dewatered sludge and the dewatered effluent. This is followed by extracting, as a second product, polyelectrolyte free effluent. The polyelectrolyte free effluent is recycled to the bioreactor.

Membrane bioreactor waste water treatment method

The invention concerns a method for purifying aqueous effluents, in particular polluted water, by catalytic oxidation using a three-phase reactor comprising two communicating chambers. The invention is characterised in that it consists in: maintaining the catalyst suspended and continuously circulating it between the two chambers of said reactor, by entrainment under the effect of carrier gas injected into one of said chamber, and in oxidizing the pollutants in contact with the in the other chamber, by injecting a reactive oxidizing gas in said other chamber.

Method and device for purifying aqueous effluents by catalytic oxidation

A single enclosed chamber includes a lower destabilizing area, a central filtering and coalescence area containing coalescence material, and an upper flotation and separation area. Emulsion is introduced into the lower destabilizing area and is destabilized therein. The emulsion is then passed upwardly into the central filtering and coalescence area. The dispersed phase of the emulsion is attracted to the coalescence material in the form of droplets, and as the emulsion continues to pass upwardly therethrough the droplets grow in size. During passage of the emulsion through the filtering and coalescence material, matter in suspension is filtered from the emulsion. Within the flotation and separation area is located a separation device including a lower convergent portion and an upper divergent portion. The emulsion passes through this separation device, and the coalesced dispersed phase separates from the floats on the top of the dispersion phase within the area of the upper divergent portion of the separation device. The separated dispersed and dispersion phases are separately withdrawn. The pressure difference between the upper and lower sides of the coalescence material is measured as a indication of the degree of retention of mater in suspension within the coalescence material. When this pressure difference reaches a predetermined maximum, indicative of clogging of the coalescence material, the normal separation by coalescence treatment of the emulsion is stopped, and a washing liquid, which may be the emulsion to be treated, and a gas are introduced into the destabilizing area and passed upwardly through the coalescence material, thereby removing the matter in suspension.

Growing community of inventors

Nanterre, France

Michel Cordier