Predicting Carbon Adsorption of Organics from Humid Air

by Martin D. Werner, Univ of Texas Health Science Cent at, San Antonio, Sch of Public Health, San Antonio, TX, USA,

Document Type: Proceeding Paper

Part of: Environmental Engineering


Increased levels of humidity resulted in reduced adsorption capacity for trichloroethylene (TCE) at low influent concentrations on a microporous activated carbon. Water vapor also reduced the adsorption efficiency of the carbon as measured by the relative standard deviation of the breakthrough curve ( sigma r). These significantly adverse impacts make predicting the effect of water vapor on the adsorption process in a rational manner desirable. Arguments are made that the Dubinin-Polanyi isotherm equation can be employed to predict organic vapor adsorption from humid air. The isotherm equation parameter Ks is identified as the parameter altered most significantly in the presence of moisture. Accurately estimating values for Ks at various relative humidity levels would enable the prediction of adsorption of hydrophobic organic vapors throughout a range of ambient conditions of humidity. (Author abstract. )

Subject Headings: Carbon compounds | Adsorption | Humidity | Gases | Parameters (statistics) | Water treatment | Waste treatment | Influents

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