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National Institute of Environmental Health Sciences

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Your Environment. Your Health.

Final Progress Reports: University of Arizona: Bioavailability, Soil Heterogeneity, and In-Situ Biodegradation of Organic Contaminants

Superfund Research Program

Bioavailability, Soil Heterogeneity, and In-Situ Biodegradation of Organic Contaminants

Project Leader: Mark L. Brusseau
Grant Number: P42ES004940
Funding Period: 1995 - 2000

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Final Progress Reports

Year:   1999 

During the past year, researchers began to investigate the nature of bacterial population dynamics in soil systems wherein a contaminant is being biodegraded under transport conditions. Very little is known about what happens to a bacterial population, in terms of species types and numbers, during a contaminant biodegradation/transport event. The results of initial experiments indicate that the dominant species degrading a model compound appears to change during the course of the experiment. This may be due to competition among the multiple species capable of degrading the compound. Such behavior might be expected to occur in real systems (i.e., in the field), and may be of significance for understanding contaminant transport and remediation at contaminated sites.

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