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Nasser Khalili
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Civil Engineering, Building, Construction & Architecture Engineering Transportation

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A NEW TECHNOLOGY FOR REMEDIATION OF CONTAMINATED SITES IN LOWLAND AREAS Somasundaram Valliappan; Nasser Khalili; R. K. Niven
Lowland Technology International Vol 2 No 2, Dec (2000)
Publisher : International Association of Lowland Technology

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Abstract

A new in situ remediation, method, uplow washing, is describedin which contaminants are removed by an upward fluidizing flow of water and/or gas produced by a jet inserted into a granular contaminated formation. Contaminant removal is achieved by the buoyant release of NAPL droplets and elutriation of finer particles. Experiments on contaminant removal by fluidization within a controlled column indicate significant reductions in diesel levels (95-99,9%) may be achieved by gas-liquid uplow washing (GLUW), for a wide range of initial diesel concentrations (10,000 to 150,000 mg/kg) and for soil fines contents of zero to 10%. In uniform sands, the water and gas velocities exmined during GLUW have no significant bearing on diesel remediation efficiency, suggesting that water velocities may be reduced to a level at which the fluidized bed is largely gas-supported. Significant reductions in lead concentrations (59-88%) from soils containing 1,500-1,960 mg/kg precipitated lead may also be achieved by GLUW.
Co-Authors R. K. Niven Somasundaram Valliappan