Treatment process and installation for sludge from...

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 11/02 (2006.01) C02F 3/12 (2006.01) C02F 11/00 (2006.01)

Patent

CA 2487088

The invention provides a method for the treatment of excess sludge derived from at least one effluent biological purification treatment facility producing excess sludge, whereby said method comprises at least one solubilization stage (4) and at least one sludge digestion stage (5). Said method is characterised in that it comprises at least one solubilized sludge liquid/solid separation stage (6), at the end of which the liquid fraction at least partially undergoes a digestion stage (5) before being directed upstream of said sludge biological treatment, whereas the solid fraction of said solubilized sludge is redirected to said solubilization stage (4).

L'invention a pour objet un procédé de traitement des boues en excès provenant d'au moins une installation de traitement d'épuration biologique d'effluents conduisant à la production de boues en excès, du type comprenant au moins une étape de solubilisation (4) et au moins une étape de digestion desdites boues (5), caractérisé en ce qu'il comprend au moins une étape de séparation liquide/solide (6) desdites boues solubilisées à l'issue de laquelle la fraction liquide subit au moins partiellement une étape de digestion (5) avant d'être envoyée en amont dudit traitement biologique desdites effluents, tandis que la fraction solide des boues solubilisées est ré-acheminée vers ladite étape de solubilisation (4).

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