Process for purifying sewage

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 3/12 (2006.01)

Patent

CA 2230601

A process for purifying waste water by means of activated sludge in which the waste water to be purified is taken into an aeratable sludge basin (1) followed by a sedimentation basin (5) in which the sludge and clear water are separated, whereafter sludge is taken back to the sludge basin (1) and clear water is drawn off; an operating cycle takes place in the sedimentation basin (5) several times a day in which the sludge is again mixed with the water (agitation phase R) and the withdrawal phase (A) of the operating cycle is separated from the agitation phase (R) by an interval (presedimentation phase V).

Cette invention concerne un procédé d'épuration des eaux usées au moyen de boues activées. Selon ce procédé, les eaux usées à épurer sont tout d'abord introduites dans un bassin d'aération (1) puis dans un bassin de décantation (5) où l'eau épurée est séparée des boues, puis ces boues sont renvoyées dans le bassin d'aération (1) et l'eau épurée est retirée. Un cycle opérationnel se déroule plusieurs fois par jour dans le bassin de décantation (5). Les boues sont alors à nouveau mélangées à l'eau (phase d'agitation R) et la phase de retrait (A) du cycle opérationnel est séparé de la phase d'agitation (R) par un intervalle (phase de prédécantation V).

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