Reduction of volatile organic compounds in aqueous solutions through air stripping and gas‐phase carbon adsorption

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Abstract
Aqueous solution of volatile organic compounds (VOC's) is a waste stream of many chemical process industries. Conventionally, it is treated with a costly liquid‐phase activated carbon adsorption process. An alternative process is studied, which is the combination of air stripping and gas‐phase activated carbon adsorption. The removal of VOC's from waste‐water can be as high as 99.8%, using a packed column for air stripping at room temperature. These VOC's include vinyl chloride, carbon tetrachloride, trichlorethylene, 1,1‐dichloroethane, toluene, chloroform, 1,1,1‐trichloroethane, benzene and xylene. These VOC's are separated from air and recovered through a carbon adsorption‐regeneration cycle. The cost of VOC removal and recovery is in the range from $0.457 to $0.899 per 1000 liters.