HR: 1340h
AN: H43F-0414    [Abstracts]
TI: DNAPL removal from a rough-walled single fracture with density-surfactant-motivated method
AU: * Lee, H
EM: sss777@snu.ac.kr
AF: Seoul National University, School of Earth and Environmental Sciences, NS80 Seoul National University, Seoul, 151-747 Korea, Republic of
AU: Ji, S
EM: ji0511@snu.ac.kr
AF: Seoul National University, School of Earth and Environmental Sciences, NS80 Seoul National University, Seoul, 151-747 Korea, Republic of
AU: Yeo, I
EM: iwyeo@chonnam.ac.kr
AF: Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju, 500-757 Korea, Republic of
AU: Lee, K
EM: kklee@snu.ac.kr
AF: Seoul National University, School of Earth and Environmental Sciences, NS80 Seoul National University, Seoul, 151-747 Korea, Republic of
AB: Remediation techniques to remove DNAPL in subsurface usually involve the delivery of the remedial fluids to the contamination source. However, the fractured rock environment makes effective delivery of remedial fluids very difficult to achieve. In particular, remedial fluid is rarely delivered to dead-end fractures or areas through which fluid hardly flows. Previous research shows density-surfactant-motivated method is an effective technology for the removal of DNAPL trapped in dead-end fractures, but it only considered drawing TCE out of the vertical dead-end fractures. In this study, experiments have been conducted to compare density-surfactant-motivated method with other remediation techniques and consequently to examine the applicability of the density-surfactant-motivated method to a rough-walled single fracture. A transparent glass replica was made by copying a natural granite with a fracture. Experimental apparatus was constructed, in which hydraulic gradient and the dipping angle of a fracture can be controlled. We have conducted the experiments under various conditions with a range of the bond and capillary numbers. In each experiment, a common residual DNAPL field was established, and then the mixture of dense fluid and surfactant-enhanced solution was injected into the glass fracture replica. Observations are made to compare the DNAPL residual distribution before and after the flushing of surfactant-enhanced solution.
DE: 5104 Fracture and flow
DE: 5139 Transport properties
DE: 1829 Groundwater hydrology
DE: 1831 Groundwater quality
DE: 1832 Groundwater transport
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting