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AN APPROACH FOR PASSIVE REMOVAL OF RESIDUAL LNAPL FROM GROUNDWATER
Svitana, K. and J. South.
Groundwater Monitoring and Remediation 39(2):64-70(2019)

This paper presents a passive approach for recovering persistent LNAPLs using nonwoven hydrophobic oil absorbing cloth. Lab trials assessed the physical properties of the cloth, including sorptive capacity and rate, buoyancy, and LNAPL wicking. It was determined that the cloth could be rolled and secured with cable ties for placement in the wells/sumps. Two placement designs were developed, one where rolled sorbent freely floated on the well/sump fluid surface and a second where the sorbent roll was placed in the fluid column at a fixed depth. Sorbents were then used at two manufacturing facilities where LNAPLs persisted for decades. In both instances, many wells/sumps were reduced to thicknesses below the action level in <2 months. In most wells, LNAPL did not reaccumulate. Where it did reaccumulate, it was <50% of the original thickness. Using lab-derived recovery rates, cloth sorbents could be sized to minimize placement/recovery frequency while effectively recovering LNAPL.



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