NONEQUILIBRIUM TRANSPORT OF ORGANIC-CHEMICALS - THE IMPACT OF PORE-WATER VELOCITY

被引:86
作者
BRUSSEAU, ML
机构
[1] Soil and Water Science Department, Tucson, AZ 85721, 429 Shantz Building
关键词
D O I
10.1016/0169-7722(92)90003-W
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The impact of variations in pore-water velocity on the nonequilibrium sorption and transport of organic chemicals was investigated. Miscible displacement experiments were performed with four organic chemicals (dichlorobenzene, naphthalene, tetrachloroethene and p-xylene) and three aquifer materials having low organic-carbon contents (0.02-0.1%). The results of the experiments were analyzed by using a one-dimensional advective-dispersive transport model, wherein sorption is considered instantaneous for a fraction of the sorbent and rate-limited for the remainder. An inverse relationship between the reverse sorption rate constant and the equilibrium sorption constant was evident for each of two velocities. However, there was an order-of-magnitude difference between the rate constants obtained at the two velocities. This suggests the existence of a time-scale effect, which must be accounted for when modeling the transport of organic solutes.
引用
收藏
页码:353 / 368
页数:16
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