C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 1/62 (2006.01) B09C 1/08 (2006.01) C02F 1/52 (2006.01) C02F 1/54 (2006.01) C02F 1/56 (2006.01) C02F 1/66 (2006.01)
Patent
CA 2492817
A method for removing metal contaminants from water uses lignin derivatives, such as lignosulfonates and kraft lignin, a coagulant, such as a metal salt, and a pH-increasing composition. The lignin derivative is dispersed in the contaminated water, the coagulant is added and the pH is adjusted as required to cause flocculation. A sludge is formed that contains the metals and that is separated from the treated water by filtration. Related methods are used to reduce the leachable metal content of contaminated soils. The invention also provides a composition for stabilizing the metal contaminants in soil, comprising lignin derivatives, a coagulant and a composition for increasing the pH. The mixture is blended with the contaminated soil, reducing its leachable metal content.
L'invention concerne un procédé permettant d'éliminer les contaminants métalliques contenus dans l'eau. Ce procédé comprend l'utilisation de dérivés de lignine tels que lignosulfonates et lignine kraft, d'un coagulant tel qu'un sel métallique et d'une composition augmentant le pH. Il consiste à disperser le dérivé de lignine dans l'eau contaminée, à ajouter le coagulant, et à régler le pH à un niveau permettant de provoquer une floculation, et à former une boue contenant les métaux et qui est séparée de l'eau traitée par filtration. Des procédés analogues permettent de réduire la teneur en métaux lixiviables des sols contaminés. L'invention concerne en outre une composition permettant de stabiliser les contaminants métalliques dans le sol. Cette composition comprend des dérivés de lignine, un coagulant et une composition permettant d'augmenter le pH. Cette composition est mélangée avec le sol contaminé pour réduire sa teneur en métaux lixiviables.
Noram Engineering And Constructors Ltd.
Oyen Wiggs Green & Mutala Llp
Zhuang J. Ming
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