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1. (WO2018220492) SYSTEM AND METHOD FOR THERMAL DESTRUCTION OF UNDESIRED SUBSTANCES BY SMOLDERING COMBUSTION

Pub. No.:    WO/2018/220492    International Application No.:    PCT/IB2018/053727
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Sat May 26 01:59:59 CEST 2018
IPC: B09C 1/06
B09C 1/08
F23C 99/00
F23G 7/14
Applicants: CHEVRON U.S.A. INC.
Inventors: THOMAS, David G.
SRA, Kanwartej S.
BIRETA, Paul J. H.
SABADELL, Gabreil P.
Title: SYSTEM AND METHOD FOR THERMAL DESTRUCTION OF UNDESIRED SUBSTANCES BY SMOLDERING COMBUSTION
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.