Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Reexamination Certificate
2008-09-02
2008-09-02
Hruskoci, Peter A. (Department: 1797)
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
C210S727000, C210S730000, C210S912000, C210S913000, C210S914000
Reexamination Certificate
active
11334437
ABSTRACT:
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.
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Hruskoci Peter A.
Noram Engineering and Constructors Ltd.
Oyen Wiggs Green & Mutala LLP
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