US 9,750,967 B1Granted

Process for treating contaminated soil

AssigneeChevron U.S.A. Inc.

InventorsThomas Peter Hoelen, Gabriel P. Sabadell

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Abstract

Disclosed are a process and a system for treating contaminated soil. The process includes introducing a contaminated soil to an agitation unit. Ozone is supplied to the agitation unit thereby forming a soil-gas mixture, and the soil-gas mixture is agitated for sufficient time for the ozone to contact the contaminants thereby forming an ozone-treated soil and a residual gas-particulates mixture. The ozone-treated soil and the residual gas-particulates mixture are removed from the agitation unit. If necessary, remaining ozone is then flushed from the soil. The process occurs under negative pressure to prevent ozone from being released to the atmosphere.

Claims27

Dependent claims

A process for treating contaminated soil, comprising:

a. introducing a soil containing a contaminant and moisture to an agitation unit;
b. supplying ozone to the agitation unit thereby forming a soil-gas mixture;
c. agitating the soil-gas mixture in the agitation unit such that the ozone contacts the contaminant thereby forming an ozone-treated soil and a residual gas-particulates mixture;
d. removing the ozone-treated soil from the agitation unit;
and
e. removing the residual gas-particulates mixture from the agitation unit;
wherein the agitation unit and the removal of the residual gas-particulates mixture from the agitation unit are maintained under negative pressure to prevent ozone from being released to the atmosphere.

4 more elements

Dependencies are inferred from the claim text.