Aquifer washing by micellar solutions: 1 optimization of alcohol-surfactant- solvent solutions

摘要

Phase diagrams were used for the formulation of alcohol-surfactant-solvent and to identify the DNAPL(Dense Non Aqueous Phase Liquid)extraction zones. Four potential extraction zones of Mercier DNAPL, a mixture of heavy aliphatics, aromatics and chlorinated hydrocarbons, were Identified but only one microemulsion zone showed satisfactory DNAPL recovery in sand Columns. More than 90 and column experiments were performed and demonstrate that:(1) Neither surfactant in water, alcohol-surfactant solutions, nor pure solvent can effectively recover Mercier DNAPL and that only alcohol-surfactant-solvent solutions are efficient; (2)adding salts To alcohol-surfactant or to alcohol-surfactant-solvent solutions does not have a beneficial effect On DNAPL recovery; (3)washing solution formulations are site specific and must be modified if The surface properties of the solids;