US 2024/0416401 A1 · REMOVAL OF PFAS FROM CONTAMINATED SOIL

Abstract

The invention comprises a process for remediation of soil comprising PFAS. The process comprises steps a)-d). In step a) sludge and a first gaseous stream are heated in a first spouting bed incinerator, thereby generating a raw material for a ceramic article and a first gaseous stream comprising a first flue gas, the first gaseous stream comprising the first flue gas having a temperature of at least 800° C. In step b) the first gaseous stream comprising the first flue gas is heat exchanged with a second gaseous stream in an air-to-air heat exchanger, thereby generating a second gaseous stream with a temperature of at least 500° C. In step c) the soil comprising PFAS is contacted with the second gaseous stream in a dryer, thereby evaporating the PFAS from the soil and generating clean soil and a second gaseous stream comprising PFAS. In step d) the second gaseous stream comprising PFAS is further heated to a temperature of at least 1000° C. in a second spouting bed incinerator, thereby generating a second gaseous stream comprising destructed PFAS.

Claims18

Dependent claims

A process for remediation of soil comprising PFAS, the process comprising:

a) heating sludge and a first gaseous stream in a first spouting bed incinerator, thereby incinerating organic materials in the sludge, resulting in a raw material for a ceramic article and the first gaseous stream comprising a first flue gas, the first gaseous stream comprising the first flue gas having a temperature of at least 800° C.;
b) heat-exchanging the first gaseous stream comprising the first flue gas with a second gaseous stream in an air-to-air heat exchanger, thereby resulting in the second gaseous stream with a temperature of at least 500° C.;
c) contacting soil comprising PFAS with the second gaseous stream with a temperature of at least 500° C. in a dryer, thereby evaporating the PFAS from the soil, resulting in clean soil and the second gaseous stream comprising PFAS;
and
d) destructing PFAS contained in the second gaseous stream at a temperature of at least 1000° C. in a second spouting bed incinerator, thereby resulting in the second gaseous stream comprising destructed PFAS.

2 more elements

A process for remediation of soil comprising PFAS comprising:

heating sludge and a first gaseous stream in a first spouting bed incinerator, thereby incinerating organic materials in the sludge, resulting in a raw material and the first gaseous stream comprising a first flue gas, the first gaseous stream having a temperature between 800-1400° C.;
heat-exchanging the first gaseous stream with a second gaseous stream in an air-to-air heat exchanger, thereby resulting in the second gaseous stream having a temperature between 500-900° C.;
contacting soil comprising PFAS with the second gaseous stream in a dryer, thereby evaporating an amount of PFAS from the soil, resulting in an amount of clean soil and the second gaseous stream comprising PFAS;
and
destructing PFAS contained in the second gaseous stream in a second spouting bed incinerator, thereby resulting in the second gaseous stream comprising destructed PFAS.

2 more elements

Dependencies are inferred from the claim text.

Removal of pfas from contaminated soil

Life of this patent

Removal of pfas from contaminated soil

Life of this patent

Abstract

Claims18