1. Descriptions and History of Development
This system captures and recovers volatile organic compounds (VOCís). The process uses granular activated carbon (GAC) to remove the VOCís from the air stream. It continuously regenerates the used GAC with microwaves, and recovers the VOCís, desorbed from the GAC, by condensation. The process has been proven at McClellan Air Force Base in 2003 to present.
a. To recover any hydrocarbon vapor, i.e. from SVE systems
b. Recover vapor discharged from gasoline (fuel) distribution stations
c. Recover vapor discharged from dry cleaners, and paint booths
d. Can be used in conjunction with in-situ microwaves to treat vapors being created by energy waves
3. Existing Treatment Alternatives - competition
The alternative is catalytic oxidation, which requires large volumes of natural gas to oxidize VOCís in SVE vapors (600 - 800o C). This oxidation produces dioxin as a by-product. Dioxin is a known carcinogen. Permits are no longer granted in California to use catalytic oxidation. GAC adsorption beds are used to capture solvent or gasoline vapors from sources listed above. Saturated GAC are transported to the coal power plants and burned.