Reduction of perchloretylene and hexavalent chromium by means of Fe(O) and bioestimulation of anaerobic microorganisms
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 releas...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2010 |
| País: | México |
| Institución: | UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO |
| Repositorio: | Revista Internacional de Contaminación Ambiental |
| Idioma: | español |
| OAI Identifier: | oai:ojs.pkp.sfu.ca:article/21642 |
| Acceso en línea: | https://www.revistascca.unam.mx/rica/index.php/rica/article/view/21642 |
| Access Level: | acceso abierto |
| Palabra clave: | percloroetileno cromo hexavalente compuesto liberador de oxígeno hierro de valencia cero barreras reactivas permeables |
| Sumario: | 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 cosubstrate 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. |
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