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A correction factor for predicting the multicomponent adsorption of air stripper offgas

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Abstract:

Air stripping is a common way to remove volatile organic compounds (VOCs) from drinking water with the off-gas from air stripping often requiring treatment. The removal of the VOCs from the off-gas can be achieved by adsorbing the VOCs onto granulated activated carbon (GAC). When the capacity for GAC to adsorb VOCs becomes exhausted, VOCs are again released to the atmosphere. A previous model of the GAC adsorption process used molar volume, VM , as an affinity coefficient to predict the breakthrough curves of the VOCs; however, an additional correction factor, δ, which had no theoretical base was necessary to adequately fit multicomponent breakthrough curves.

In this paper, Hilderbrand's cohesive energy density term, c, is applied as the correction factor providing a more theoretical basis for multicomponent adsorption. When c is applied to the VM affinity coefficient, the heat of vaporization (Hv ) adequately describes the multicomponent data and does not require additional correction factors to fit the breakthrough curves of a mixture of seven different chlorinated VOCs.

Keywords: ACTIVATED CARBON; ADSORPTION; AIR STRIPPER OFFGAS; DESIGN

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/106143096X127217

Publication date: January 1, 1996

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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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