Reducción de percloroetileno y cromo hexavalente mediante FE(0) y bioestimulación de microorganismos anaerobios

fe-microorganisms interactions in and around permeable reactive barriers, for reduction of perchloroethylene and hexavalent chromium in polluted aquifers were examined. biostimulation was done by the addition of a co-substrate for microbial communities already present in the soil. an hydrogen release compound (hrc), a commercial co-substrate which releases lactic acid at slow rates in presence of water was selected. results show that hrc addition increases (>100 %) the reduction of pce in iron-containing systems. nevertheless, reductive dechlorination was not complete and caused accumulation of toxic metabolites such as trichloroethylene. for chromium reduction, bioestimulation enhanced reduction capability of the systems by 20 %. in this case, the effect was not stimulation of cr-reducers, but the improvement of redox conditions.