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The AAPG/Datapages Combined Publications Database

Environmental Geosciences (DEG)

Abstract

Environmental Geosciences, 2003, V. 10, No. 1, P. 1-17.

Copyright copy2003. The American Association of Petroleum Geologists/Division of Environmental Geosciences. All rights reserved.

DOI: 10.1306/eg100102003

Heavy-Previous HitmetalNext Hit contamination removal by bacterial activity in seeping depositories

I. Lerche,1 W. Glaesser, G. Strauch

1Department of Geological Sciences, University of South Carolina, Columbia, South Carolina; email: [email protected]
2Umweltforschungszentrum Leipzig-Halle GmbH, Theodor-Lieser-Strasse 4, Halle (Saale), Germany
3Umweltforschungszentrum Leipzig-Halle GmbH, Theodor-Lieser-Strasse 4, Halle (Saale), Germany

AUTHORS

Ian Lerche is professor of geology at the University of South Carolina. His current major research interests are in the fields of basin analysis, salt, economic risk, and environmental problems. He has published several hundred papers and more than a dozen books. He is the recipient of numerous awards and honors, including the Levorsen Award of the AAPG. Currently, he sits on several editorial boards and is also technical editor for Energy Exploration amp Exploitation.

ACKNOWLEDGMENTS

The authors particularly wish to thank the several generations of scientists who have made measurements over the last two decades at the Halle-Kanena depository, and without whose help, this paper would not have been as focused on the immediate problems needing resolution. Figures 10, 11, 12, 13 are taken directly from the compilation by Strauch (1996), whereas Figures 8 and 9 are English versions of the same figures in Strauch (1996). All figures used directly and also in modified form are with permission of the Umweltforschungszentrum, Halle-Leipzig and with permission of G. Strauch.

ABSTRACT

Heavy-Previous HitmetalNext Hit removal from a toxic waste depository in East Germany occurs through the action of bacterial scavenging, as contaminant-laden waters transit a bounding dam. Measurements inside and outside the toxic domain indicate that this removal can amount to more than 90% of particular heavy metals from the exiting waters. This paper examines the steady-state behavior of interconnected bacterial number density dependence on the heavy-Previous HitmetalNext Hit concentration, removal of the bacteria by heavy-Previous HitmetalNext Hit poisoning, and simultaneous removal of the heavy metals by bacterial scavenging. Adjustment of the birth and death rates of bacteria, together with a propensity for the bacteria to seek out and scavenge the richest zones of heavy-Previous HitmetalNext Hit contamination in the waters seeping through the dam, are the main intertwined components that allow heavy-Previous HitmetalNext Hit removal.

There is also a critical concentration such that bacteria cannot scavenge in waters with heavy metals above the critical concentration; the closeness of the input concentration to the critical value at the toxic side of the bounding dam plays a significant role in the spatial distribution of heavy-Previous HitmetalTop removal and also in bacterial number density concentration. Measurements both inside and outside the toxic depository allow one to bracket combinations of some of the biological parameters to account for the observations, but there are no uniquely determined values; such would require measurements in the dam materials. For a variety of health-risk reasons, such dam probes are not likely to be allowed in the near future, so that the determinations are limited.

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