Impacts of Source Zone Architecture on Nonaqueous Phase Liquid Dissolution and Cleanup: A Magnetic Resonance Imaging Study

131 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2006.Alternate flushing with water and two surfactant pulses (5∼6 pore volumes) resulted in 63% of NAPL mass removal from both aquifers. However, NAPL mass flux reduction was lower from aquifer 2 (68%) with a shorter correlation length than from aquifer 1 (82%). Local effluent concentrations from aquifer 2 increased by as high as 34 times after surfactant flushing. 3D MR images of NAPL revealed that NAPL migrated downward and created additional pools in previously uncontaminated areas at the bottom of the aquifers. The additional NAPL pools were created in the direction transverse to the flow in aquifer 2, which explains the higher mass flux relative to aquifer 1.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD