Pollutant Fluxes to Aquatic Systems via Coupled Biological and Physicochemical Bed-Sediment ProcessesEPA Grant Number: R825513C011
Subproject: this is subproject number 011 , established and managed by the Center Director under grant R825513
(EPA does not fund or establish subprojects; EPA awards and manages the overall grant for this center).
Center: HSRC (1989) - South and Southwest HSRC
Center Director: Reible, Danny D.
Title: Pollutant Fluxes to Aquatic Systems via Coupled Biological and Physicochemical Bed-Sediment Processes
Investigators: Reible, Danny D. , Thibodeaux, Louis J. , Valsaraj, Kalliat T. , Fleeger, J. W.
Institution: Louisiana State University - Baton Rouge
EPA Project Officer: Hahn, Intaek
Project Period: January 1, 1995 through January 1, 1998
Project Amount: Refer to main center abstract for funding details.
RFA: Hazardous Substance Research Centers - HSRC (1989) RFA Text | Recipients Lists
Research Category: Hazardous Substance Research Centers , Land and Waste Management
The objectives for the second half of this research were to: a) expand the database relating the nature and magnitude of contaminant release by bioturbation, from a functional-group perspective by investigating additional bioturbating species, b) evaluate the effectiveness of our laboratory model by examining bioturbation impacts on field-contaminated sediments, c) initiate studies of metals release from sediments via bioturbation caused by changes in redox conditions, d) continue to improve the predictive capability of contaminant fate and transport models using the results from a-c, and e) initiate studies to determine the significance of bioturbation-related flux on aquatic systems in the field. A final objective was to explore the possibility that laboratory flux measurements can be used to provide a better indicator of adverse ecological impact than total sediment concentration.
As with the previous experiments, small experimental microcosms were employed to evaluate contaminant flux. The experimental chambers consist of a small plexiglass chambers, 15cm x 5 cm x 4.5 cm. The sediment (with or without bioturbators) is loaded into the chamber and water flowed over the top at rates of 500 ml/h. The effluent is collected at selected time intervals and the concentration of the contaminant determined using an HPLC. The flux of contaminant to the water thereby determined. The incurrent water is an artificial pond water (0.5 mN NaCl, 0.2mM NaHCO3, 0.05 mM KCl, 0.4 mM CaCl2). The sediment used is a native Louisiana sediment contaminated with polyaromatic hydrocarbons in the laboratory. Different organisms were placed within these microcosms and their effect on contaminant fate and transport evaluated. Redox probes were constructed in the laboratory to evaluate the impact of the organisms on redox conditions within the experimental microcosms.
For some experiments, small centrifuge tubes were employed in which organisms could be placed and covered with a porous cloth. Fecal matter could be collected on this cloth and analyzed to determine egestion rate, chemical defecation rates and complete a material balance on the chemical contaminants.
In addition to the experiments, significant work was directed toward developing conceptual, simple analytical and sophisticated numerical models of bioturbation. These were calibrated and tested against the experimental date collected.
Publications and Presentations:Publications have been submitted on this subproject: View all 20 publications for this subproject | View all 392 publications for this center
Journal Articles:Journal Articles have been submitted on this subproject: View all 4 journal articles for this subproject | View all 106 journal articles for this center
Supplemental Keywords:bioturbation, contaminated sediments, and fate and transport., RFA, Scientific Discipline, Waste, Water, Ecosystem Protection/Environmental Exposure & Risk, Chemical Engineering, Contaminated Sediments, Environmental Chemistry, Fate & Transport, Analytical Chemistry, Hazardous Waste, Ecology and Ecosystems, Hazardous, Environmental Engineering, fate and transport, hazardous waste management, hazardous waste treatment, risk assessment, sediment treatment, environmental technology, contaminated marine sediment, soil and groundwater remediation, biodegradation, kinetics, contaminated sediment, chemical contaminants, contaminated soil, hydrology, marine sediments, remediation, bioremediation of soils, chemical kinetics, biotransformation, currents, technology transfer, extraction of metals, anaerobic biotransformation, bioturbation, heavy metals, technical outreach, bioremediation, contaminant transport models
Progress and Final Reports:
Main Center Abstract and Reports:R825513 HSRC (1989) - South and Southwest HSRC
Subprojects under this Center: (EPA does not fund or establish subprojects; EPA awards and manages the overall grant for this center).
R825513C001 Sediment Resuspension and Contaminant Transport in an Estuary.
R825513C002 Contaminant Transport Across Cohesive Sediment Interfaces.
R825513C003 Mobilization and Fate of Inorganic Contaminant due to Resuspension of Cohesive Sediment.
R825513C004 Source Identification, Transformation, and Transport Processes of N-, O- and S- Containing Organic Chemicals in Wetland and Upland Sediments.
R825513C005 Mobility and Transport of Radium from Sediment and Waste Pits.
R825513C006 Anaerobic Biodegradation of 2,4,6-Trinitrotoluene and Other Nitroaromatic Compounds by Clostridium Acetobutylicum.
R825513C007 Investigation on the Fate and Biotransformation of Hexachlorobutadiene and Chlorobenzenes in a Sediment-Water Estuarine System
R825513C008 An Investigation of Chemical Transport from Contaminated Sediments through Porous Containment Structures
R825513C009 Evaluation of Placement and Effectiveness of Sediment Caps
R825513C010 Coupled Biological and Physicochemical Bed-Sediment Processes
R825513C011 Pollutant Fluxes to Aquatic Systems via Coupled Biological and Physicochemical Bed-Sediment Processes
R825513C012 Controls on Metals Partitioning in Contaminated Sediments
R825513C013 Phytoremediation of TNT Contaminated Soil and Groundwaters
R825513C014 Sediment-Based Remediation of Hazardous Substances at a Contaminated Military Base
R825513C015 Effect of Natural Dynamic Changes on Pollutant-Sediment Interaction
R825513C016 Desorption of Nonpolar Organic Pollutants from Historically Contaminated Sediments and Dredged Materials
R825513C017 Modeling Air Emissions of Organic Compounds from Contaminated Sediments and Dredged Materials title change in last year to "Long-term Release of Pollutants from Contaminated Sediment Dredged Material"
R825513C018 Development of an Integrated Optic Interferometer for In-Situ Monitoring of Volatile Hydrocarbons
R825513C019 Bioremediation of Contaminated Sediments and Dredged Material
R825513C020 Bioremediation of Sediments Contaminated with Polyaromatic Hydrocarbons
R825513C021 Role of Particles in Mobilizing Hazardous Chemicals in Urban Runoff
R825513C022 Particle Transport and Deposit Morphology at the Sediment/Water Interface
R825513C023 Uptake of Metal Ions from Aqueous Solutions by Sediments
R825513C024 Bioavailability of Desorption Resistant Hydrocarbons in Sediment-Water Systems.
R825513C025 Interactive Roles of Microbial and Spartina Populations in Mercury Methylation Processes in Bioremediation of Contaminated Sediments in Salt-Marsh Systems
R825513C026 Evaluation of Physical-Chemical Methods for Rapid Assessment of the Bioavailability of Moderately Polar Compounds in Sediments
R825513C027 Freshwater Bioturbators in Riverine Sediments as Enhancers of Contaminant Release
R825513C028 Characterization of Laguna Madre Contaminated Sediments.
R825513C029 The Role of Competitive Adsorption of Suspended Sediments in Determining Partitioning and Colloidal Stability.
R825513C030 Remediation of TNT-Contaminated Soil by Cyanobacterial Mat.
R825513C031 Experimental and Detailed Mathematical Modeling of Diffusion of Contaminants in Fluids
R825513C033 Application of Biotechnology in Bioremediation of Contaminated Sediments
R825513C034 Characterization of PAH's Degrading Bacteria in Coastal Sediments
R825513C035 Dynamic Aspects of Metal Speciation in the Miami River Sediments in Relation to Particle Size Distribution of Chemical Heterogeneity