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Omnium De Traitement Et De Valorisation (otv)

Omnium De Traitement Et De Valorisation

Michele Payraudeau

Henry Behmann

Hidayat Husain

Herve Buisson

Arnaud Gisclon

Xavier Le Tallec

The invention concerns a method and installation for the treatment of excess sludge derived from biological wastewater treatment plants. The method is characterized in that it consists of associating at least one digestion step ( ) and at least one wet oxidation step ( ) of said sludge, said wet oxidation step being conducted at a temperature of between 50&deg; C. and 180&deg; C. and at a pressure of between 2 and 40 bar.

Method for treating an effluent using simultaneous nitrification/denitrification in a biological filter

A single tank submerged membrane bioreactor for treating feed water having unacceptable levels of ammonia or total nitrogen has both a membrane scouring bubble supply and an oxygenating bubble supply. The membrane scouring bubble supply continuously provides large scouring bubbles to clean the membranes. Permeate is continuously withdrawn from the membranes at a high rate but the large scouring bubbles do not transfer sufficient oxygen to the mixed liquor to create aerobic conditions in the reactor. The oxygenating bubble supply is operated to provide small bubbles of air or oxygen that intermittently produce aerobic conditions in a significant part of the mixed liquor. Alternating aerobic and anoxic conditions occur in a significant portion of the tank suitable for nitrification and denitrification. The level of dissolved oxygen (DO) or oxygen reduction potential (ORP) in the tank is measured by sensors and determines when the oxygenating bubble supply will be turned on or off between set minimum and maximum time limits.

Submerged membrane bioreactor for treatment of nitrogen containing water

The invention relates to a method for checking and regulating the pressure loss in a biological filter of the type comprising an immersed filter bed (2) consisting of at least one layer of granular filtration material, the said granular material layer acting as a support for a biomass used to degrade carbon-based and/or nitrogen-based pollution in water to be filtered, characterized in that it comprises a step consisting of continuously or discontinuously injecting at least one coagulating agent (1) into the said water before its entry into the said filter.

Method for checking and regulating the pressure loss in a biological

The invention relates to a method for regulation of aeration in a biological filter of the type comprising conveyance means (3) bringing water to be filtered into the lower part of the filter, a filter bed (2) acting as a support to the biomass, means of distributing an oxygenated gas (5, 5a) in the filter bed (2), a layer of filtered water (7) above the said filter bed, a nozzle for (4) of discharging the filtered water in the upper part of the filter, characterized in that it consists of taking account of the efficiency Ct with which the biomass uses the distributed oxygen to regulate the said distributed oxygenated gas flow and/or its concentration in molecular oxygen, in order to optimize the quantity of molecular oxygen distributed by the said distribution means.

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Eaubonne, France

Michele Payraudeau