Effects of microbial processes on the performance of a ReSponge™ zero valent iron PRB

Research output: Contributions to collected editions/worksPublished abstract in conference proceedingsResearchpeer-review

Authors

Throughout 6 yr of operation, the pilot Rheine ZVI CRB has consistently shown constant degradation rates of perchloroethylene (PCE) at rates > 98%, and it is assumed that combined abiotic and biotic effects inside the barrier significantly contribute to this successful performance. Microbial activities at the Rheine PRB for remediation practice and long-term performance of PRB were studied. Microbial activity led to significant consumption of molecular hydrogen, which was produced abiotically through the anaerobic corrosion of zero valent iron. ReSponge™ seemed to be superior to other ZVI types regarding long term degradation efficiency, likely due to its specific characteristics (larger granules, but amorphous with a high internal surface, special composition). Therefore, it provided high dechlorination potential towards the chlorinated contaminants even after 7 yr of operation of the Rheine barrier. Besides the consumption of H2, homo-acetogenic and methanogenic bacteria could help reduce excessive carbonate precipitation by converting dissolved CO2 into acetate and methane, respectively. However, direct biological contribution by means of dechlorination could not be observed. This is an abstract of a paper presented at the proceedings of the 8th International In Situ and On-Site Bioremediation Symposium (Baltimore, MD 6/6-9/2005).

Original languageEnglish
Title of host publicationProceedings of the 8th International In Situ and On-Site Bioremediation Symposium
Number of pages1
PublisherElsevier B.V.
Publication date2005
Pages1671
ISBN (print)978-157477152-7
Publication statusPublished - 2005
Event8th International In Situ and On-Site Bioremediation Symposium - Baltimore, MD, United States
Duration: 06.06.200509.06.2005
Conference number: 8