C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 3/12 (2006.01) C02F 11/12 (2006.01) C02F 1/00 (2006.01)
Patent
CA 2462145
The invention relates to a method for purifying wastewaters, particularly wastewaters produced in the paper industry, involving the following steps: a) aerobic clarification of the wastewater using activated sludge in an activation stage; b) carrying out, in a secondary settling tank, a subsequent clarification of a portion of the wastewater/activated sludge mixture leaving the activation stage; c) desiccating, in a desiccation unit, another portion of the wastewater/activated sludge mixture leaving the activation stage; d) returning at least a portion of the activated sludge removed in steps b) and c) into the activated sludge tank.
L'invention concerne un procédé d'épuration d'eaux usées provenant notamment de l'industrie du papier. Le procédé selon l'invention comporte a) l'épuration aérobie des eaux usées au moyen de boues activées dans une étape d'activation ; b) l'épuration secondaire d'une partie du mélange de boues activées et d'eaux usées sortant de l'étape d'activation, dans un bassin d'épuration secondaire ; c) la déshydratation d'une autre partie du mélange de boues activées et d'eaux usées sortant de l'étape d'activation, dans un groupe de déshydratation ; et, d) la recirculation d'au moins une partie des boues activées séparées dans les étapes b) et c) dans le bassin de boues activées.
Armbruster Hans-Thomas
Benz Wendelin
Kraft Harald
Papierfabrik August Koehler Ag
Robic
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