Method for purifying process water from pulp manufacture

Details Method for purifying process water from pulp manufacture Method for purifying process water from pulp manufacture

C - Chemistry, Metallurgy

02

F

C02F 9/00 (2006.01) B01D 1/00 (2006.01) B01D 1/12 (2006.01) C02F 1/52 (2006.01) C02F 1/54 (2006.01) C02F 1/56 (2006.01)

Patent

CA 2176001

Process water from pulp manufacture (2) is purified in a separator device (7) by mechan- ical or a combination of mechanical and chem- ical methods and is thereafter evaporated (3), at least palt of the concentrate resulting from the evaporation being recycled (4) and mixed with the process water fed into the separator device (7). In a preferred embodiment, a precipitant (5) is added to the mixed water comprising the process water and the concentrate. The part of the concentrate not recycled and mixed with the process water (11) is supplied, optionally after further evaporation, with an acid (13) to a pH of 1-5, whereupon resulting flocs and precipitates are removed in a separator device (12).

On purifie l'eau de traitement issue de la production (2) de pâte à papier dans un dispositif de séparation (7) par des procédés mécaniques ou mécaniques et chimiques combinés, puis on procède à son évaporation (3), au moins une partie du concentré provenant de l'évaporation étant recyclé (4) puis mélangé à l'eau de traitemet alimentant le dispositif de séparation (7). Dans un mode de réalisation préféré, on ajoute un précipitant (5) à l'eau mélangée comprenant l'eau de traitement ainsi que le concentré. On ajoute à la partie du concentré non recyclé et mélangé à l'eau de traitement (11), facultativement après une nouvelle évaporation, un acide (13) à un pH compris entre 1 et 5, après quoi on extrait les flocons et les précipités obtenus dans un dispositif de séparation (12).

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