L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des

Alain Rigouard

Bernard Jamonet

Jean-Pierre Bouchez

Jean Duc

In a sludge thickener, supernatant fluid is drawn off via peripheral ducts and oxygenated at a suitable location. The supernatant fluid is thereafter reintroduced into the thickener via diffusers distributed transversely of the thickener and intermediate the peripheral ducts. The generation of nauseating smells is thereby prevented, and an advantageous increase of the concentration of the sludges is attained.

Waste water sludge thickener with odor control

The solid particles 33' coated with a biological material are developed at the upper end of a bed 32 which is fluidized by a supply of water 3. The particles 33' are removed at 12 and decanted at 11 and then introduced through a pipe 20 at the upper end 22 of an auxiliary anaerobic fermentation column which converts the biological coating into a gaseous mixture which escapes at 27. The regenerated particles are withdrawn at 28 and conveyed at 30 to the purifying bed. Application in the biological purification of waste waters.

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Echirolles, France

Alain Rigouard