Aquifer washing by micellar solutions: 3 field test at the Thouin Sand Pit(L' Assomption, Quebec, Canada)

摘要

A field test was performed t recover DNAPL(Dense Non Aqueous Phase Liquid)in a shallow aquifer at the Thouin Sand Pit near Montreal, to evaluate a new technique of aquifer restoration involving surfactant solutions. Laboratory tests have shown that washing solutions containing alcohols, surfactants, and solvents are very efficient in recovering DNAPL as a miscible phase. The Thouin field test was designed to:(1)study in situ recovery of DNSPL;(2) evaluate an injection-pumping strategy;(3)test the use of polymer solutions to control the mobility of a washing solution slug and to improve the vertical sweep efficiency throughout the sand unit.