Browsing by Author "Barnett, Mark O."

Now showing items 1-20 of 25

Analytical Solutions for Sequentially Coupled Multi-Species Reactive Transport Problems

Srinivasan, Venkatraman (2007-12-15)

Multi-species reactive transport equations coupled through sorption and sequential first-order reactions are commonly used to model sites contaminated with radioactive wastes, chlorinated solvents and nitrogenous species. ...

An Assessment of U(VI) Adsorption at Multiple Scales

Loganathan, Vijay Anand (2010-10-21)

Iron (III) (oxyhydr)oxide coatings on soils and sediments are one of the most important factors in controlling the adsorption and transport of U(VI) in the subsurface. In this study, iron-coated sands were prepared via two ...

Chemical Factors Influencing Colloid Mobilization and Th(IV) Transport through Saturated Subsurface Sediment

Haliena, Brian (2012-07-10)

In recent years, subsurface colloid mobilization has attracted considerable attention due to its suspected role in enhancing the transport of strongly adsorbing contaminants. Such colloid-facilitated contaminant transport ...

Coupling Transport Codes with Geochemical Models

Kumar, Anjani (2006-12-15)

Multi-dimensional reactive transport models are needed for understanding the fate and transport of the metal contaminants in groundwater aquifers. The goal of this research is to develop a framework for coupling the MINTEQ ...

Decreasing Lead Bioaccessibility In Soils With Phosphate Amendments

Moseley, Rebecca (2006-08-15)

Ingestion of Pb-contaminated soil has been proposed as a primary exposure pathway for elevated blood Pb levels in young children (Dudka and Miller, 1999). Children are often exposed to soils contaminated with toxic metals ...

Destruction of Perchlorate and Nitrate by Stabilized Zero-valent Iron Nanoparticles and Immobilization of Mercury by a New Class of Iron Sulfide Nanoparticles

Xiong, Zhong (2007-12-15)

This research compares representative standard strong-base anion (SBA) and weak-base anion (WBA) exchangers, a bifunctional resin (A-530E), a class of polymeric ligand exchangers (PLE’s), and an ion-exchange fiber (IXF) ...

Durability of Nitinol for Structural Applications

McCarty, David (2006-08-15)

Nitinol is a shape memory alloy that has recently been studied for its suitability as a material in energy dissipation devices in structures. The alloy has excellent structural capabilities in terms of strength and ...

Engineered Treatment of As-Laden Regeneration Brine from Ion Exchange Processes

Steinwinder, Thomas (2006-05-15)

Arsenic (As) contamination of drinking water sources has been one of the most challenging global environmental issues. In the United States, the newly revised maximum contaminant level (MCL) of 10 µg/L requires thousands ...

Experimental and Modeling Investigation of Arsenate adsorption on Synthetic Iron-coated sand

Jeppu, Gautham (2011-04-21)

Arsenic is an environmental contaminant of worldwide concern due its high toxicity and presence in groundwater aquifers. Adsorption of arsenic onto metal-oxides is an important phenomenon that locally controls the transport ...

Experimental and Numerical Analysis of Variable-density Flow and Transport Scenarios

Goswami, Rohit Raj (2008-12-15)

Saltwater contamination has received a lot of attention in the past few years with natural disasters such as tsunamis and hurricanes causing widespread groundwater pollution. Groundwater modeling of saline contaminant ...

Factors Affecting Arsenic Mobilization in Experimental Subsurface Systems

Radu, Tanja (2007-12-15)

Elevated concentrations of arsenic (As) in groundwater is a widespread problem that affects millions of people around the world. Other than the adverse affects on human health, this problem often raises economic, social ...

The Fate and Transport of the Antimicrobials Sulfadimethoxine and Ormetoprim in the Environment

Sanders, Sarah (2007-05-15)

Over the past decade, there have been increasing concerns regarding antimicrobial contaminants in the environment. To date, there exists limited research regarding the fate of these compounds in the environment once ...

Fate, Transport, and Environmental Availability of Cu(II) Applied in Catfish Aquaculture Ponds and Enhanced Immobilization of Soil-bound Lead Using a New Class of Stabilized Iron Phosphate Nanoparticles

Liu, Ruiqiang (2007-05-15)

Copper sulfate has been the most commonly used algaecide for about a century in the U.S. to control the off-flavor problem caused by blue-green algae in channel catfish (Ictalurus punctatus) ponds. In 2001, the ~80,000 ...

Higher Ethers as Replacement Oxygenates for Methyl Tertiary Butyl Ether in Gasoline: Synthetic and Environmental Aspects

Snelling, Jeff (2007-05-15)

The use of oxygenates, particularly methyl tertiary butyl ether (MtBE), in reformulated gasoline has reduced the levels of carbon monoxide and unburned hydrocarbons in ambient air. However, the widespread contamination ...

Immobilization of Mercury Using Iron Sulfide Minerals

Bower, Julia (2007-08-15)

Mercury is a pervasive pollutant that has caused environmental and health problems throughout the world. Numerous industries including coal-fired power plants and chlor-alkali plants have discharged mercury into the ...

The Influence of Colloidal Kaolinite on Th(IV) Transport in Saturated Porous Media

Zheng, Hangping (2013-11-11)

Many laboratory and field studies have indicated that colloid mobilization was the most important potential source of enhancing the transport of a variety of contaminants in groundwater. However, limited research studied ...

Mercury Immobilization by Subsurface Reactive Barriers

Dove, Jonathan (2009-08-17)

Mercury contamination is becoming a prevalent problem for environmental engineers. Chlor-alkali plants and coal fire power plants are the main contributors to the spread of this neurotoxin into the environment. Mercury ...

Methods for Scaling and Comparing Adsorption Datasets

Hartzog, Owen (2008-08-15)

The presence of reactive groundwater contaminants are a great concern to many government agencies and private entities. The fate and transport of these contaminants is determined by their interactions with subsurface ...

Pilot-Testing an Ion Exchange Technology for Selective and Regenerative Arsenate Removal and an Engineered Approach for Stabilizing Arsenic-Laden Process Waste Residuals

Luo, Chunhui (2008-12-15)

Pilot-scale tests of a regenerable and selective polymeric ligand exchanger (PLE) were conducted to remove As(V) at the well field of El Paso Water Utilities (EPWU) in El Paso, TX, USA. The PLE was prepared by immobilizing ...

Potential Negative Effects of Adding Phosphate-Based Fertilizers to Lead In Metal-Contaminated Soils

Kilgour, Douglas (2007-08-15)

The potential negative effects of adding phosphate amendments for lead (Pb) remediation in Pb-contaminated soils were studied using column and batch experiments. Soils contaminated with high levels of lead as well as ...