TY - CHAP

T1 - Effects of microbial processes on the performance of a ReSponge™ zero valent iron PRB

AU - Birke, Volker

AU - Wegner, Martin

AU - Rosenthal, Heidrun

AU - Steiof, Martin

N1 - Conference code: 8

PY - 2005

Y1 - 2005

N2 - 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).

AB - 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).

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=33745862734&partnerID=8YFLogxK

M3 - Published abstract in conference proceedings

AN - SCOPUS:33745862734

SN - 978-157477152-7

T3 - Proceedings of the 8th International In Situ and On-Site Bioremediation Symposium

SP - 1671

BT - Proceedings of the 8th International In Situ and On-Site Bioremediation Symposium

PB - Elsevier B.V.

T2 - 8th International In Situ and On-Site Bioremediation Symposium

Y2 - 6 June 2005 through 9 June 2005

ER -