Efficient biodegradation of subsurface contaminants
requires two elements: (1) microbial populations with the necessary degradative
capabilities,and (2) favorable subsurface geochemical and hydrologic conditions. Practical constraints on experimental design and
interpretation in both the hydrogeologic and microbiological sciences have
resulted in limited knowledge of the interaction between hydrogeological and
microbiological features of subsurface environments. These practical constraints include: (1)
inconsistencies between the scales of investigation in the hydrogeological and
microbiological sciences, and (2) practical limitations on the ability to
accurately define microbial populations in environmental samples. However, advances in application of
small-scale sampling methods, and interdisciplinary approaches to site
investigation are beginning to significantly improve understanding of
hydrogeological and microbiological interactions.
Likewise, culture-based and molecular analyses of microbial populations
in subsurface contaminant plumes have revealed significant adaptation of
microbial populations to plume environmental conditions. Results of recent studies suggest that
variability in subsurface geochemical and hydrologic conditions significantly
influences subsurface microbial-community structure. Combined investigations of site
conditions and microbial community structure provide the knowledge needed to
understand interactions between subsurface microbial populations, plume
geochemistry, and contaminant biodegradation.
Publication
Haack, S. K. and Bekins, B.
A., 2000, Microbial populations in contaminant plumes. Hydrogeology Journal, v.
8, no. 1, p. 63-76.
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