Hydraulic and earth engineering – Soil remediation – In situ contaminant removal or stabilization
Reexamination Certificate
2006-04-18
2006-04-18
Hruskoci, Peter A. (Department: 1724)
Hydraulic and earth engineering
Soil remediation
In situ contaminant removal or stabilization
C210S710000, C210S725000, C210S727000, C210S912000, C210S913000, C210S914000, C405S128750, C588S256000
Reexamination Certificate
active
07029202
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.
Oyen Wiggs Green & Mutala LLP
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