Towards characterizing LNAPL remediation endpoints

Journal of Environmental Management
Kaveh Sookhak LariGreg B Davis

Abstract

Remediating sites contaminated with light non-aqueous phase liquids (LNAPLs) is a demanding and often prolonged task. It is vital to determine when it is appropriate to cease engineered remedial efforts based on the long-term effectiveness of remediation technology options. For the first time, the long term effectiveness of a range of LNAPL remediation approaches including skimming and vacuum-enhanced skimming each with and without water table drawdown was simulated through a multi-phase and multi-component approach. LNAPL components of gasoline were simulated to show how component changes affect the LNAPL's multi-phase behaviour and to inform the risk profile of the LNAPL. The four remediation approaches along with five types of soils, two states of the LNAPL specific mass and finite and infinite LNAPL plumes resulted in 80 simulation scenarios. Effective conservative mass removal endpoints for all the simulations were determined. As a key driver of risk, the persistence and mass removal of benzene was investigated across the scenarios. The time to effectively achieve a technology endpoint varied from 2 to 6 years. The recovered LNAPL in the liquid phase varied from 5% to 53% of the initial mass. The recovered LNAPL mass as ex...Continue Reading

Citations

Mar 4, 2019·Journal of Environmental Management·Miguel A Alfaro SotoMartinus Th van Genuchten
Mar 20, 2021·The Science of the Total Environment·Adrián Flores OrozcoGiorgio Cassiani
Mar 26, 2021·Journal of Environmental Management·Kaveh Sookhak LariGreg B Davis
Jan 15, 2020·Journal of Contaminant Hydrology·Maziar ArshadiMohammad Piri

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