Degremont

Michele Pannier

Pavel Chudoba

Patrick Vion

Alain Truc

Reactor for biologically removing organic pollutants from water

Process for the treatment of liquid effluents, such as waste water, for the purpose of removal of carbon, nitrogen and phosphorus pollution using an activated sludge, according to which the effluent, after having been subjected to mechanical pretreatments, is brought into contact with the activated sludge. The effluent/activated sludge mixture is the subjected to clarification/settling in order to separate the treated water from the thickened sludge, the latter then being recycled at the head of the aeration treatment and the excess sludge being continuously discharged. An inert material of inorganic origin is injected into the activated sludge, this material being immediately and homogeneously dispersed in the activated sludge, in order to create a mixed culture containing both, and in a single bacterial floc, free heterotrophic species and autotrophic species partially fixed on the particles of the said material within the floc. The structure of the latter contains in the order of 40 to 65% of organic matter, the remainder being the said inert material, consisting of one or a number of particles of the said material surrounded by activated sludge. The extraction of the excess sludge is carried out continuously and without separation of the injected material.

Process for the treatment of liquid effluents by activated sludge

Process for the biological treatment of water using a biological reactor containing a culture of microorganisms, immobilized on a granular support material, according to which an expendable powdery material is injected into the said reactor, said process being performed so as to ensure a self-selection and a self-regulation of the support material of the particle size necessary for the biological process.

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Croissy S/Seine, France

Michele Pannier