Waste-water treatment plant and method

C - Chemistry – Metallurgy – 02 – F

Patent

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362/4

C02F 3/30 (2006.01) C02F 3/04 (2006.01) C02F 3/12 (2006.01)

Patent

CA 1144665

ABSTRACT OF THE DISCLOSURE A plant for the treatment of waste water, such as municipal sewage and industrial wastes containing organic matter which must be decomposed, comprises a mechanical clarifier for the removal of non- degradable and coarse contaminants, an activation vessel for a first digestion stage operating with an oxygen content close to zero mg/l with facultative an aerobic operation, an intermediate clarifier, an aeration stage formed with a trickle-body (drop body) for aerobic digestion, an after clarifier and an arrangement for the removal and preferably the treatment of surplus sludge. An unaerated mixing (facultative anaerobic) basin is provided upstream of the afterclarifier in which water from the trickle-body stage is contacted with surplus sludge from the activation basin.

346811

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