The air/water exchange of volatile organic compounds from waters in the transient and turbulent regime

被引：17

作者：

DeWulf, J ^{[1
]}

Van Langenhove, H ^{[1
]}

Heireman, B ^{[1
]}

机构：

[1] State Univ Ghent, Fac Agr & Appl Biol Sci, Dept Organ Chem, B-9000 Ghent, Belgium

来源：

WATER RESEARCH | 1998年 / 32卷 / 07期

关键词：

volatile organic compounds (VOCs); air/water exchange; volatilization; mass transfer coefficient; Reynolds number;

D O I：

10.1016/S0043-1354(97)00457-0

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The air/water exchange velocity of thirteen volatile organic compounds was investigated in laboratory stirred tank experiments. A standardized setup was used so that the exchange of VOCs could be examined as a function of the level of turbulence, expressed by the Reynolds number. The exchange rate showed an exponential correlation with the level of turbulence. The commonly used relationship, in which the air/water exchange rate of volatile organic compounds is calculated from the reaeration rate by introducing a factor equal to the ratio of the diffusion coefficients, raised to the power n, showed an exponent n = 0.56 +/- 0.05. It was statistically proven that this relationship is valid both in the transient and turbulent regime of the water system. The imposed degree of turbulence did give rise to reaeration and volatilization rates of the same order as in riverine systems, so that the obtained functional relationship can be applied in these environmental systems. (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：2106 / 2112

页数：7