TY - JOUR
T1 - Prediction of mass-transfer coefficient for solute transport in porous media.
AU - Maraqa, M. A.
N1 - Funding Information:
This research was funded in part by the Scientific Research Council at the United Arab Emirates University. I am grateful to A.M.O. Mohamed and E. Abdul Hafiz for their comments on earlier versions of this manuscript. I also appreciate the useful comments from the anonymous reviewers.
PY - 2001/12/1
Y1 - 2001/12/1
N2 - Several previously reported laboratory studies related to transport of solutes through packed columns were utilized to develop predictive relationships for mass-transfer rate coefficient. The data were classified into two groups: those obtained under rate-limited mass transfer between mobile and immobile water regions (physical nonequilibrium conditions), and those derived from rate-limited mass transfer between instantaneous and slow sorption sites (sorption nonequilibrium conditions). The mass-transfer coefficient in all these studies was obtained by fitting breakthrough data to a transport model employing a first-order rate limitations with a "constant" mass-transfer coefficient, independent of flow conditions. This study demonstrated that the mass-transfer coefficient in these models is dependent on system parameters including pore-water velocity, length-scale, retardation coefficient, and particle or aggregate size. Predictive relationships were developed, through regression analysis, relating mass-transfer coefficient to residence time. The developed relationships adequately estimated previously reported field mass-transfer values. Successful simulations of field desorption data reported by Bahr [J. Contam. Hydrol. 4 (1989) 205] further demonstrate the potential applicability of the developed relationships.
AB - Several previously reported laboratory studies related to transport of solutes through packed columns were utilized to develop predictive relationships for mass-transfer rate coefficient. The data were classified into two groups: those obtained under rate-limited mass transfer between mobile and immobile water regions (physical nonequilibrium conditions), and those derived from rate-limited mass transfer between instantaneous and slow sorption sites (sorption nonequilibrium conditions). The mass-transfer coefficient in all these studies was obtained by fitting breakthrough data to a transport model employing a first-order rate limitations with a "constant" mass-transfer coefficient, independent of flow conditions. This study demonstrated that the mass-transfer coefficient in these models is dependent on system parameters including pore-water velocity, length-scale, retardation coefficient, and particle or aggregate size. Predictive relationships were developed, through regression analysis, relating mass-transfer coefficient to residence time. The developed relationships adequately estimated previously reported field mass-transfer values. Successful simulations of field desorption data reported by Bahr [J. Contam. Hydrol. 4 (1989) 205] further demonstrate the potential applicability of the developed relationships.
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U2 - 10.1016/S0169-7722(01)00198-X
DO - 10.1016/S0169-7722(01)00198-X
M3 - Comment/debate
C2 - 11816992
AN - SCOPUS:0035656289
SN - 0169-7722
VL - 53
SP - 153
EP - 171
JO - Journal of contaminant hydrology
JF - Journal of contaminant hydrology
IS - 1-2
ER -