Improved method for purifying waste water using activated...

C - Chemistry – Metallurgy – 02 – F

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C02F 3/12 (2006.01) C02F 1/28 (2006.01) C02F 3/10 (2006.01)

Patent

CA 2157795

A method for increasing the purification yield in a waste water purification plant activation tank by means of an activated sludge method, wherein optionally cationized talcum, pyrophyllite, kaolin or mica with a particle size under 100 mu m is fed into the biomass in amounts of up to 2.0 g per litre of waste water. A substantial improvement in solid/liquid separation at the outlet of the activation tank as well as increase in the yield of removed carbon, nitrogen and phosphate pollutants are observed even when the plant is operating at medium or full capacity.

L'invention concerne un procédé pour l'augmentation du rendement d'épuration dans le bassin d'activation d'une station d'épuration d'eaux usées mettant en oeuvre le procédé dit à "boues activées". Selon l'invention, on introduit dans la biomasse du talc, pyrophyllite, kaolin ou mica, éventuellement cationisé, avec une taille des particules inférieure à 100 µm dans des quantités allant jusqu'à 2,0 g par litre d'eaux usées. On observe une amélioration importante de la séparation solide/liquide en sortie du bassin d'activation ainsi qu'une augmentation du rendement d'épuration en pollution carbonnée, du rendement d'épuration en pollution azotée et du rendement d'épuration en pollution phosphatée même si la station fonctionne en moyenne ou forte charge.

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