Volatilization of Organic Compounds from Streams

by Ronald E. Rathbun, (M.ASCE), Hydro.; U. S. Geological Survey, National Space Tech. Lab., NSTL Station, Miss.,
Doreen Y. Tai, Chemist; U. S. Geological Survey, National Space Tech. Lab., NSTL Station, Miss.,


Serial Information: Journal of the Environmental Engineering Division, 1982, Vol. 108, Issue 5, Pg. 973-989


Document Type: Journal Paper

Errata: (See full record)

Abstract: Mass-transfer coefficients for the volatilization of ethylene and propane were correlated with the hydraulic and geometric properties of seven streams, and predictive equations were developed. The equations were evaluated using a normalized root-mean-square error as the criterion of comparison. The two best equations were a two-variable equation containing the energy dissipated per unit mass per unit time and the average depth of flow and a three-variable equation containing the average velocity, the average depth of flow, and the slope of the stream. Procedures for adjusting the ethylene and propane coefficients for other organic compounds were evaluated. These procedures are based on molecular diffusivity, molecular diameter, or molecular weight. Because of limited data, none of these procedures have been extensively verified. Therefore, until additional data become available, it is suggested that the mass-transfer coefficient be assumed to be inversely proportional to the square root of the molecular weight.

Subject Headings: Rivers and streams | Mass transfer | Volatilization | Ethylene | Hydraulic properties | Flow duration | Geometrics

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