T Transworld Research Network 37/661 (2), Fort P.O. Trivandrum-695 023 Kerala, India Recent Advances in Pharmaceutical Sciences, 2011: 223-246 ISBN: 978-81-7895-528-5 Editor: Diego Muñoz-Torrero 10. Biological remediation approach involving soils and groundwaters polluted with chlorinated solvents in a Mediterranean context Amparo Cortés 1 , Diana Puigserver 2 , José Maria Carmona 2 and Manuel Viladevall 2 1 Department of Natural Products, Plant Biology and Soil Science, Faculty of Pharmacy University of Barcelona, 08028 Barcelona, Spain; 2 Department of Geochemistry, Petrology and Geological Prospecting, Faculty of Geology, University of Barcelona, 08028 Barcelona, Spain Abstract. Chlorinated solvents such as trichloroethene (TCE) and tetrachloroethene (PCE) form a class of dense non-aqueous phase liquid (DNAPL) compounds that cause a persistent environmental contamination that is difficult to investigate and challenging to remediate. The use of vegetation to enhance degradation by soil microorganisms of chlorinated solvents in soil-groundwater systems (phyto and rhizo-degradation) has been receiving attention since the 90’ as an attractive low-cost alternative. Remediation strategies must be site-specific, with separate approaches often warranted for the DNAPL source zone and its associated aqueous phase plume. It has been suggested that possible mechanisms for the enhanced bioremediation of TCE in the rhizosphere are excretion of phenolic compounds in root exudates and plant mycorrhization. Correspondence/Reprint request: Dra. Amparo Cortés, Department of Natural Products, Plant Biology and Soil Science, Facultat de Farmàcia, Universitat de Barcelona, 08028 Barcelona, Spain. E-mail: acortes@ub.edu