Degremont, Societe Generale D'epuration Et D'assainissement

Michel Renaudin

Jacques Bernard

A plant for the biological processing by means of activated sludge, by oxidation with pure oxygen or oxygen-enriched air, followed by a settling step, of a liquid suspension containing oxidizable matters, includes, in addition to the settling tank, a plurality of oxidation tanks disposed in series, communicating with each other, and adapted to be supplied with oxygen or oxygen-enriched air and the suspension to be treated, while recycling the decanted sludge, the suspension to be treated flowing in the direction of from the upstream tank to the downstream tank. The oxygen or oxygen-enriched air is introduced into the downstream tank and the venting of the plant to the atmosphere takes place from the upstream tank, whereby the venting of the plant to the atmosphere is responsive to the oxygen content of the gaseous phase in the upstream tank where the oxygen demand and therefore the oxygen concentration have their highest values, and the flow of oxygen or oxygen enriched air from the downstream tank wherein the demand for this gas and the consumption thereof are appreciably lower, cause an immediate and continuous increment in the oxygen content of the gaseous phase in the upstream tank, thus ensuring a rapid response to any oxygen demand together with a regular and continuous oxygen supply to the plant.

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Beynes, France

Michel Renaudin