Prediction and minimization of vertical migration of DNAPLS using surfactant enhanced aquifer remediation at neutral buoyancy

Surfactant enhanced aquifer remediation (SEAR) had previously been thought to require a capillary barrier below the contaminated zone to prevent the v ertical migration of a microemulsion containing solubilized DNAPL. This pap er shows the vertical migration of the dense microemulsion is described and predicted by the value of three dimensionless scaling groups. Embedded wit hin these scaling groups are four design parameters. The value of these par ameters can be manipulated in order to reduce the amount of vertical migrat ion anticipated for a given remediation design. Plots have been constructed that illustrate the relationship between vertical migration and the value of the scaling groups; such plots can be used to predict vertical migration and to determine appropriate screen intervals of extraction wells to ensur e full capture of the contaminants. This predictive capability has been ver ified in laboratory experiments. Predicted migration of the microemulsion a greed within about 2% of that observed Development of the scaling groups is presented, remediation design implications are discussed, and laboratory v erification is shown. Additional discussion of the laboratory work is given in a companion paper [Kostarelos, K., Pope, G.A., Rouse, B.A., Shook, G.M. , 1998. A new concept: the use of neutrally-buoyant microemulsions for DNAP L remediation, J. Contam. Hydro., this edition]. (C) 1998 Elsevier Science B.V. All rights reserved.