公开(公告)号：US20180345338A1

公开(公告)日：2018-12-06

申请号：US15608797

申请日：2017-05-30

Applicant: Chevron U.S.A. Inc.

Inventor： David G. THOMAS ,  Kanwartej S. SRA ,  Paul J. H. BIRETA ,  Gabriel P. SABADELL

IPC: B09C1/06 ,  F23G7/14

CPC classification number: B09C1/06 ,  F23G7/14 ,  F23G2209/24

Abstract: Porous media containing undesired substances, e.g., perfluoroalkylated substances, are treated by mixing the porous media with a solid fuel comprising organic material. The mixture is heated to 200° C. to 400° C. to initiate smoldering combustion and an oxidizer gas is forced through the heated mixture such that the smoldering combustion is self-sustaining until the mixture reaches a PFAS destructive temperature and the perfluoroalkylated substances are thermally destroyed. A system is provided for conducting the treatment. The system includes a source of wax, wood chips, sawdust, tire scraps, waste rubber compounds, coal, granular activated carbon, solid fat, and combinations thereof as solid fuel. A mixer is provided for mixing the porous media with the solid fuel. An ignition system including static heating elements and a gas blower are provided for forcing heated oxidizer gas through the mixture such that self-sustaining smoldering combustion of the mixture is initiated and sustained.