Paul M Bradley
Introduction: Research Hydrologist/Ecologist with the South Atlantic Water Science Center focused on understanding environmental contaminant mixture exposures and real versus perceived effects to human and environmental health.
Paul is project lead, along with Kelly Smalling, of the Drinking-Water and Wastewater Infrastructure Integrated Science Team of the Ecosystems Mission, Environmental Health Program. His research focuses on human exposures to and potential effects of inorganic, organic, and microbial contaminant mixtures in drinking water at the point of use and on anthropogenic contaminant mixtures as ecosystem stressors.
Professional Experience
1988–present: Research Ecologist/Hydrologist, U.S. Geological Survey
Expertise:
• Contaminant mixtures
• Drinking water
• Water quality
• Environmental health
Education and Certifications
B.S., Applied Biology, Georgia Institute of Technology, Atlanta, Georgia
M.S., Applied Biology, Georgia Institute of Technology, Atlanta, Georgia
Ph.D., Physiological Ecology, University of South Carolina, Columbia, South Carolina
Science and Products
Microbial mineralization of ethene under sulfate-reducing conditions
Rapid evolution of redox processes in a petroleum hydrocarbon-contaminated aquifer
Widespread potential for microbial MTBE degradation in surface-water sediments
Methyl tert-butyl ether biodegradation by indigenous aquifer microorganisms under natural and artificial oxic conditions
Methyl t-Butyl Ether Mineralization in Surface-Water Sediment Microcosms under Denitrifying Conditions
Biodegradation of MTBE by indigenous aquifer microorganisms under artificial oxic conditions
Potential contribution of microbial degradation to natural attenuation of MTBE in surface water systems
Biodegradation of MTBE by indigenous aquifer microorganisms under artificial oxic conditions
Potential contribution of microbial degradation to natural attenuation of MTBE in surface water systems
Effect of redox conditions on MTBE biodegradation in surface water Sediments
Biodegradation potential of chlorinated solvents in ground water at the Naval Surface Warfare Center, Louisville, Kentucky, July 1999 to February 2000
The fate of haloacetic acids and trihalomethanes in an aquifer storage and recovery program, Las Vegas, Nevada
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Microbial mineralization of ethene under sulfate-reducing conditions
Previous investigations demonstrated that respiratoly reductive dechlorination of vinyl chloride (VC) can be efficient even at H2 concentrations (≤2 nM) that are characteristic of SO4-reducing conditions. In the study reported here, microorganisms indigenous to a lake-bed sediment completely mineralized [1,2-14C] ethene to 1414CO2 when incubated under SO4-reducing conditions. Together, these obserAuthorsP. M. Bradley, F. H. ChapelleRapid evolution of redox processes in a petroleum hydrocarbon-contaminated aquifer
Ground water chemistry data collected over a six‐year period show that the distribution of contaminants and redox processes in a shallow petroleum hydrocarbon‐contaminated aquifer has changed rapidly over time. Shortly after a gasoline release occurred in 1990, high concentrations of benzene were present near the contaminant source area. In this contaminated zone, dissolved oxygen in ground waterAuthorsF. H. Chapelle, P. M. Bradley, D. R. Lovley, Kyle O'Neil, J. E. LandmeyerWidespread potential for microbial MTBE degradation in surface-water sediments
Microorganisms indigenous to stream and lake bed sediments, collected from 11 sites throughout the United States, demonstrated significant mineralization of the fuel oxygenate, methyl-tert-butyl ether (MTBE). Mineralization of [U-14C]MTBE to 14CO2 ranged from 15 to 66% over 50 days and did not differ significantly between sediments collected from MTBE contaminated sites and from sites with no histAuthorsP. M. Bradley, J. E. Landmeyer, F. H. ChapelleMethyl tert-butyl ether biodegradation by indigenous aquifer microorganisms under natural and artificial oxic conditions
Microbial communities indigenous to a shallow groundwater system near Beaufort, SC, degraded milligram per liter concentrations of methyl tert-butyl ether (MTBE) under natural and artificial oxic conditions. Significant MTBE biodegradation was observed where anoxic, MTBE-contaminated groundwater discharged to a concrete-lined ditch. In the anoxic groundwater adjacent to the ditch, concentrations oAuthorsJ. E. Landmeyer, F. H. Chapelle, H.H. Herlong, P. M. BradleyMethyl t-Butyl Ether Mineralization in Surface-Water Sediment Microcosms under Denitrifying Conditions
Mineralization of [U-14C] methyl t-butyl ether (MTBE) to 14CO2 without accumulation of t-butyl alcohol (TBA) was observed in surface-water sediment microcosms under denitrifying conditions. Methanogenic activity and limited transformation of MTBE to TBA were observed in the absence of denitrification. Results indicate that bed sediment microorganisms can effectively degrade MTBE to nontoxic producAuthorsP. M. Bradley, F. H. Chapelle, J. E. LandmeyerBiodegradation of MTBE by indigenous aquifer microorganisms under artificial oxic conditions
Oxygen in the form of a metal peroxide slurry (MgO2 and water) was added to an anoxic part of a gasoline-contaminated aquifer in South Carolina to test the hypothesis that artificial oxic conditions will lead to MTBE biodegradation by indigenous microorganisms in anoxic, gasoline-contaminated aquifers. The slurry slowly released dissolved oxygen upon hydrolysis with groundwater, and was a proprietAuthorsJ. E. Landmeyer, P. M. BradleyPotential contribution of microbial degradation to natural attenuation of MTBE in surface water systems
The potential contribution of in situ biodegradation as a mechanism for natural attenuation of MTBE in surface water was studied. Surface water sediments from streams and lakes at 11 sites throughout the US. Microbial degradation of [U-14C] MTBE was observed in surface-water-sediment microcosms under anaerobic conditions, but the efficiency and products of anaerobic MTBE biodegradation were strongAuthorsP. M. Bradley, F. H. Chapelle, J. E. LandmeyerBiodegradation of MTBE by indigenous aquifer microorganisms under artificial oxic conditions
The hypothesis that artificial oxic conditions will lead to MTBE biodegradation by indigenous microorganisms in anoxic, gasoline-contaminated aquifers was examined by adding oxygen in the form of a metal peroxide slurry to an anoxic part of gasoline-contaminated aquifer in South Carolina. Field observations of relatively rapid aerobic MTBE biodegradation following oxygen addition suggest that theAuthorsJ. E. Landmeyer, P. M. BradleyPotential contribution of microbial degradation to natural attenuation of MTBE in surface water systems
To evaluate the potential contribution of in situ biodegradation as a mechanism for natural attenuation of MTBE in surface water, surface water sediments were collected from streams and lakes at 11 sites throughout the US and the ability of the indigenous microorganisms to mineralize [U-14C] MTBE to 14CO2 under aerobic conditions was examined. Mineralization of [U-14C] MTBE to 14CO2 ranged from 15AuthorsP. M. Bradley, F. H. Chapelle, J. E. LandmeyerEffect of redox conditions on MTBE biodegradation in surface water Sediments
Microbial degradation of methyl tert-butyl ether (MTBE) was observed in surface water-sediment microcosms under anaerobic conditions. The efficiency and products of anaerobic MTBE biodegradation were dependent on the predominant terminal electron-accepting conditions. In the presence of substantial methanogenic activity, MTBE biodegradation was nominal and involved reduction of MTBE to the toxic pAuthorsP. M. Bradley, F. H. Chapelle, J. E. LandmeyerBiodegradation potential of chlorinated solvents in ground water at the Naval Surface Warfare Center, Louisville, Kentucky, July 1999 to February 2000
The U.S. Geological Survey, in cooperation with the U.S. Department of the Navy, Southern Division Naval Facilities Engineering Command, investigated the potential for biodegradation of chlorinated solvents in ground water at the Naval Surface Warfare Center (also known as the Naval Ordnance Station, or the station), Louisville, Kentucky. The subsurface down to at least 100 feet at the staAuthorsDon A. Vroblesky, Paul M. Bradley, Matthew D. Petkewich, Clifton C. CaseyThe fate of haloacetic acids and trihalomethanes in an aquifer storage and recovery program, Las Vegas, Nevada
The fate of disinfection byproducts during aquifer storage and recovery (ASR) is evaluated for aquifers in Southern Nevada. Rapid declines of haloacetic acid (HAA) concentrations during ASR, with associated little change in Cl concentration, indicate that HAAs decline primarily by in situ microbial oxidation. Dilution is only a minor contributor to HAA concentration declines during ASR. TrihalometAuthorsJ. M. Thomas, W.A. McKay, E. Colec, J. E. Landmeyer, P. M. Bradley - Web Tools
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