TY - JOUR
T1 - Nonequilibrium transport of organic chemicals
T2 - The impact of pore-water velocity
AU - Brusseau, Mark L.
N1 - Funding Information:
A portion of this work was performed while the author held an U.S. Air Force Summer Faculty Fellowship at Tyndall A.F.B., Florida. I would like to thank Drs. David Burris and Thomas Stauffer for their assistance, and Mary Reid for her help in performing some of the experiments. Research sponsored by the Air Force Office of Scientific Research under contract F49620-88-C0053. The U.S. Government is authorized to reproduce and distribute reprints for governmental purposes notwithstanding any copyright notation hereon.
PY - 1992/4
Y1 - 1992/4
N2 - 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.
AB - 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.
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U2 - 10.1016/0169-7722(92)90003-W
DO - 10.1016/0169-7722(92)90003-W
M3 - Article
AN - SCOPUS:0026849042
VL - 9
SP - 353
EP - 368
JO - Journal of Contaminant Hydrology
JF - Journal of Contaminant Hydrology
SN - 0169-7722
IS - 4
ER -