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RECORD NUMBER: 114 OF 132

OLS Field Name OLS Field Data
Main Title Simulation of the Transport of Ion-Exchanging Solutes Using Laboratory-Determined Chemical Parameter Values.
Author Valocchi, A. J. ; Roberts, P. V. ; Parks, G. A. ; Street, R. L. ;
CORP Author Illinois Univ. at Urbana-Champaign. Dept. of Civil Engineering. ;Stanford Univ., CA.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Year Published 1981
Report Number EPA-R-804431; EPA-600/J-81-683;
Stock Number PB84-174614
Additional Subjects Water quality ; Ground water recharge ; Water pollution ; Ion exchanging ; Chemical equilibrium ; Transport properties ; Aquifers ; Field tests ; Laboratory equipment ; Comparison ; Solutes ; Reprints ; Hydrogeology ; Palo Alto(California)
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NTIS  PB84-174614 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 11p
Abstract
The practical application of simulation models of the movement of chemically reacting contaminants requires the evaluation of several chemical parameters in addition to those basic hydrogeologic and hydrodynamic parameters required to model conservative constituents. This paper deals with the use of laboratory-determined chemical parameter values in the simulation of the transport of ion-exchanging solutes governed by local chemical equilibrium. The transport model has been applied to a field operation involving the injection of advanced-treated municipal wastewater into an alluvial aquifer in the Palo Alto (California) Baylands region. Basic hydrogeologic parameters, such as porosity, bulk density, and aquifer thickness, were determined by analysis of observation well logs and core samples. Data on the breakthrough of a conservative tracer at various observation wells were utilized to determine an approximate velocity field and the dispersivity values. The chemical parameters (selectivity coefficients and cation-exchange capacity) were determined using standard batch experiments conducted in the laboratory using aquifer core material. With these parameter values, the model was run to predict the breakthrough of major cations at the observation wells. The predicted results agree very closely with the actual field data. This agreement suggests that laboratory-determined chemical parameters can be successfully used in field-scale transport simulations.