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he study focused on deposits formed under two conditions of two extremes of fluid flow; quiescent settling and deposition from turbulent flow. This work was to answer specific questions including: "What does the interface look like?"; "What are the transport mechanisms that determine rate of deposition and the structure of the interface?"; and "What are the kinetics of formation of various portions of the interface?". One premise of the work was that the morphology of the interface is intimately related to, and in some cases predictable from the characteristics of the suspended particles and the local fluid flow. This study yields critical information needed to calculate mass transport across the sediment/water "boundary", to interpret data obtained from sediment cores, to determine sampling protocols for sediments, and to assess sediment remediation schemes. Approach:
This work combined models for particle transport and transformation to describe the formation of the sediment/water interface under conditions in which particle deposition rather than resuspension dominate the overall flux of particles to and from sediment. The work was compose of four interrelated tasks: 1) particle deposition under different conditions of fluid flow experiments performed using laboratory suspensions of particles of various sizes and surface chemistries; 2) similar experiments were conducted using sediment material collected from Galveston Bay or another source; 3) experimental results were compared with numerical simulations of the deposition process; and 4) to better define the chemistry of the colloidal and fineparticle phases that exist in Galveston Bay.
Publications and Presentations:Publications have been submitted on this subproject: View all 7 publications for this subproject | View all 426 publications for this center
Journal Articles:Journal Articles have been submitted on this subproject: View all 4 journal articles for this subproject | View all 113 journal articles for this center
Supplemental Keywords:deposition, fluid flow, and suspended particles. , Ecosystem Protection/Environmental Exposure & Risk, Water, Scientific Discipline, Waste, RFA, Chemical Engineering, Analytical Chemistry, Hazardous Waste, Environmental Engineering, Fate & Transport, Environmental Chemistry, Contaminated Sediments, Hazardous, Ecology and Ecosystems, heavy metals, remediation, risk assessment, contaminant transport models, biodegradation, biotransformation, fate and transport, soil and groundwater remediation, aquifer fate and treatment, deposit morphology, technical outreach, chemical kinetics, contaminated sediment, anaerobic biotransformation, environmental technology, hazardous waste management, marine sediments, contaminated soil, bioremediation of soils, contaminated marine sediment, hazardous waste treatment, hydrology, sediment treatment, technology transfer, kinetics, chemical contaminants
Progress and Final Reports:
Final Report
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
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The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.
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Like a viscous, slimy liquid
What does a solid liquid and gas look like?
Solid matter liquid Gas .................. . . . . . . . .................. . . . . .
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When a solid dissolves, the solid (solute) and the liquid (solvent) will form solution. When a solid dissolves on mixing, its particles will break apart hence forming loose associations with the liquid particles. This random mixing of particles from both solid and liquid that is called dissolving process. A solid will not dissolve in a liquid if its particles are unable to form these association with the respective liquid particles. This is a reversible process. Solute can be obtained back by evaporation etc.
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Is snow a liquid?
Not really. Snow is minute particles of ice loosely joined together, and when you pack it together hard, all the particles of ice come together and makes one big lump of ice. Another thing; If it was liquid, it would be called rain, not snow.
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What does a diagram of a liquid look like?
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What do particles look like in a syringe?
Particles in a syringe may appear as a suspension or solution depending on the type of material being injected. Suspensions typically look cloudy or have visible particles floating in the liquid, while solutions are usually clear and homogeneous. Observing particles in a syringe can give clues about the nature and consistency of the substance being dispensed.
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they look like small circles which float around
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What would the particles in a block of chocolate look like compared to the same amount of chocolate in liquid form Draw particle diagrams of the block of chocolate and liquid chocolate to support your?
The particles in a block of chocolate would be tightly packed together in a regular pattern, forming a solid structure. In contrast, the particles in liquid chocolate would have more freedom of movement and be less structured, flowing past each other. In the particle diagram of the block of chocolate, you would see closely packed particles arranged in a fixed position, while in the liquid chocolate diagram, the particles would be more spread out and moving freely.
How do you make a working model to demonstrate movements of particles in solid liquid and gas?
To create a working model demonstrating movements of particles in solid, liquid, and gas, you can use different sized balls for particles to represent the three states of matter. For a solid, pack the balls tightly together and show minimal movement. For a liquid, spread the balls out slightly and allow them to slide past each other. For a gas, scatter the balls far apart and show random movement in all directions. By visually comparing the movements of these particle models, you can effectively demonstrate the behavior of particles in different states of matter.
