Özet:

Contamination of groundwaters by chlorinated solvents such as trichloroethylene (TCE) is a widespread problem around the world and causes serious threat for human health due to being human carcinogen. Chlorinated solvents generally enter the subsurface as dense non aqueous phase liquids (DNAPL) and accumulation generally occurs in aquifers where the DNAPL mass is most likely pooled at the bottom of aquifers and become a long-term aqueous phase source zone for groundwater contamination. In situ immobilization or remediation of DNAPL source zones in such systems is crucial for protecting aquifer systems having significant groundwater potential. In situ chemical flushing (ISCF) is groundwater remediation techniques used to remove organic pollutants from the subsurface environment. The objective of the project is to test the enhanced-solubilization potential of cosmetic ramnolipid surfactant flushing performances for the specific scenario of DNAPL sources trapped in heterogeneous aquifer media. The results emphasized that in the early stage, some portion of organic liquid is hydraulically accessible (matrix) whereas the later stage of mass removal was controlled by the more poorly-accessible mass (pool) associated with higher-saturation zones. Our results also showed that the distribution and the emplacement of organic liquid, flow-field heterogeneity, flushing solution and its concentration significantly influence on remediation effort. As a result, the performance of technology depends on the site characteristics which are critical to characterize effective DNAPL remediation strategies for contaminated sites.

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