Geochemical and microbiological processes controlling anaerobic biodegradation of petroleum-contaminated groundwater

Saved in:
Authors:Schreiber, Madeline E.; Zwolinski, Michele D.; Hickey, William J.; Bahr, Jean M.
Author Affiliations:Primary:
University of Wisconsin-Madison, Department of Geology and Geophysics, Madison, WI, United States
Volume Title:Geological Society of America, 1998 annual meeting
Source:Abstracts with Programs - Geological Society of America, 30(7), p.303; Geological Society of America, 1998 annual meeting, Toronto, ON, Canada, Oct. 26-29, 1998. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0016-7592
Publication Date:1998
Note:In English
Summary:Microcosm studies are being used to elucidate biodegradation processes in a shallow, petroleum-contaminated wetland aquifer. Field monitoring indicates that intrinsic biodegradation of BTEX (benzene, toluene, ethylbenzene, xylenes) compounds is coupled to sequential reduction of oxygen, nitrate, Fe(III), sulfate, and carbon dioxide. Assimilative capacity estimates and numerical simulation of the current configuration of the BTEX plume and redox zones suggest that the most significant BTEX loss is occurring under iron-reducing conditions. TEX degradation was enhanced during a field-scale nitrate tracer experiment. Rates of degradation and nitrate utilization were similar to those estimated from microcosm experiments; however, lag times were longer in the tracer experiment than in the microcosms. During the tracer experiment, benzene did not appear to degrade under the enhanced nitrate-reducing conditions. Ongoing microcosm studies are being conducted to estimate rates of BTEX biodegradation under intrinsic, iron-reducing conditions and to evaluate the potential for enhancing benzene degradation at the site. The microcosm experiments were also designed to determine if nitrate can indirectly enhance biodegradation by stimulating growth of microbial populations that can reduce both nitrate and iron. Physiological and genetic characteristics of the microbial populations responsible for biodegradation are also under study. Results from the microcosm and field experiments will be used as input for a reactive transport model to optimize the design of a bioremediation system.
Subjects:Aromatic hydrocarbons; Biodegradation; Bioremediation; BTEX; Controls; Geochemistry; Ground water; Hydrocarbons; Iron; Metals; Monitoring; Nitrate ion; Optimization; Organic compounds; Petroleum; Pollutants; Pollution; Processes; Remediation; Simulation
Record ID:1999018907
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Tags: Add Tag
No Tags, Be the first to tag this record!
Be the first to leave a comment!
You must be logged in first