Method for treating metal-contaminated water and soil

Details Method for treating metal-contaminated water and soil Method for treating metal-contaminated water and soil

2006-01-19

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

07419605

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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