John Zachara

Mineralogic Residence and Desorption Rates of Sorbed 90Sr in Contaminated Subsurface Sediments: Implications to Future Behavior and In-Ground Stability
(Zachara EMSP-Sr, PNNL Scope #40896)

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

John Zachara

Project type

Exploratory Research

Define the mineralogic residence and intraparticle distribution of 137Cs in sediments contaminated with two different high-level waste (HLW) types, and to define the relationships of residence and…

Influences of Hydrologic Exchange Flows on River Corridor and Watershed Biogeochemical Function

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

James Stegen

We are developing predictive understanding of the processes that govern influences of hydrologic exchange flows on water quality, nutrient dynamics, and ecosystem health in dynamic river corridor…

Impacts of Mineralogy and Competing Microbial Respiration Pathways on the Fate of Uranium in Contaminated Groundwater (Zachara, NABIR-U,
PNNL Scope #41648)

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

John Zachara

Project type

Exploratory Research

Characterize the dominant Fe and S minerals that are likely to limit U speciation in-situ; directly quantify reaction rates and pathways of microbial respiration (terminal electron-accepting)…

Characterization of U(VI) Sorption-Desorption Processes and Model Upscaling (Zachara, EMSP-U, PNNL Scope #43914)

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

John Zachara

Project type

Exploratory Research

Develop experimental data, process-level models, and up-scaling approaches to improve capabilities to model U(VI) transport in heterogeneous vadose zone and groundwater plumes.

The Influence of Calcium Carbonate Grain Coatings on Contaminant Reactivity in Vadose Zone (Zachara, EMSP-Carbonate, PNNL Scope # 30952)

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

John Zachara

Project type

Exploratory Research

To test three hypothesis to determine the effect of surface carbonate formation on the interaction of contaminants with minerals in the vadose zone at Hanford.

S & T Road Mapping for Needs From All Sources (Zachara EM-ST, PNNL Scope #30998)

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

John Zachara

Project type

Exploratory Research

Hanford Remediation and Closure Science Project The Hanford Site Groundwater Protection Program, formerly the Groundwater/ Vadose Zone Integration Project, was established in 1997 to develop the…

Remediation & Closure Science Project/ Subsurface Science Tasks (Zachara/Freshly, EM-closure, PNNL Scope #47040). [was aka S & T Road Mapping for Needs From All Sources (PNNL Scope #30998)].

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

John Zachara

Project type

Exploratory Research

Hanford Remediation and Closure Science Project The Hanford Site Groundwater Protection Program, formerly the Groundwater/ Vadose Zone Integration Project, was established in 1997 to develop the…

Grand Challenge in Biogeochemistry

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

James Fredrickson

Project type

Grand Challenge

Do multiheme cytochromes associated with the outer membrane of metal reducing bacteria (mtrC in Shewanella oneidensis and omcB in Geobacter sulfurreducens, for example) transfer electrons to Fe(III)…

The Role of Microenvironments and Physicochemical Subsurface Components on Field Scale Biogeochemistry and Contaminant Mobility

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

James McKinley

Project type

Exploratory Research

This is a renewal proposal for a previous collaborative effort between the PNNL Scientific Focus Area (SFA) and EMSL. The research proposed will resolve critical Hanford and basic subsurface science…

Establish a Penn State Center for Environmental Kinetics - as part of the Environmental Molecular Science Institute (EMSI) program (NSF/DOE-OBER) [PNNL Scope #47287, Zachara EMSI)

Lead Institution

Pennsylvania State University

Principal Investigator

William Burgos

Project type

Exploratory Research

The National Science Foundation has awarded a team of Penn State researchers $6.7 million to establish a new center for the study of environmental kinetics. Susan L. Brantley, director of the…

Hanford GW/VZ Science Integration (Zachara EM-GW/VZ, PNNL Scope # 32326)

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

John Zachara

Project type

Exploratory Research

Incorporate science into the Hanford Ground Water Vadose Zone Integration project. This approach will include coordinating and engaging technical exchanges with principal investigators of current and…

Mineralogical and Morphological Characterization of microbially reduced oxides and oxyhydroxides

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Paul Gassman

Project type

Exploratory Research

This proposal is for ongoing research under the NABIR program. The programmatic needs for instrumentation in the IPS directorate of EMSL include access to the field emission scanning electron…

Influence of Mass transfer on Bioavailablility and Kinetic Rate of U(VI) Biotransformation (Liu NABIR-U, PNNL Scope # 45386. Liu NABIR.)

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Chongxuan Liu

Project type

Exploratory Research

Enhance our understanding on the mechanisms that influence uranium bioavailability and kinetic rate of biotransformation in contaminated sediments.

Microscale and spectroscopic investigations in geochemical and microbiological systems

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

John Zachara

Project type

Large-Scale EMSL Research

Apply experimental manipulation and field investigations to understanding the behavior of selected chemical and microbial components in natural systems. The research is targeted towards compounds…

Influence of Microscopic Mass Transfer on the Reactivity and Stability of Uranium

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Chongxuan Liu

Project type

Exploratory Research

This proposed project will investigate microscopic U(VI) mass transfer under influence of biogeochemical reactions in representative Hanford U(VI)-contaminated sediments. Recent research by our group…

Role of Microenvironments and Transition Zones in Subsurface Reactive Contaminant Transport

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

James McKinley

Project type

Exploratory Research

The PNNL Scientific Focus Area (SFA) will resolve critical Hanford and basic subsurface science issues through integrated, multi-disciplinary, science-theme focused research on the role of…

Role of Microenvironments and Transition Zones in Subsurface Reactive Contaminant Transport

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

James McKinley

This is a renewal proposal for a previous collaborative effort between the PNNL Scientific Focus Area (SFA) and EMSL. The research proposed will resolve critical Hanford and basic subsurface science…

(gc3563)Molecular Computational Studies In Environmental Chemistry, Geochemistry, and Biogeochemistry

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Eric Bylaska

Project type

Capability Research

Addressing the overwhelming environmental cleanup problems facing the Department of Energy?s nuclear production sites as well as other polluted sites in the nation is hampered by a lack of knowledge…

Role of Microenvironments and Transition Zones in Subsurface Reactive Contaminant Transport

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

James McKinley

This is a renewal proposal for a previous collaborative effort between the PNNL Scientific Focus Area (SFA) and EMSL. The research proposed will resolve critical Hanford and basic subsurface science…

Role of Microenvironments and Transition Zones in Field scale microbial ecology and biogeochemistry

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

James McKinley

Project type

Exploratory Research

This is a renewal proposal for a previous collaborative effort between the PNNL Scientific Focus Area (SFA) and EMSL. The research proposed will resolve critical Hanford and basic subsurface science…

Hydro-Biogeochemical Process Dynamics in the Groundwater-Surface Water Interaction Zone

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

John Zachara

This is a renewal proposal for a previous collaborative effort between the PNNL Scientific Focus Area (SFA) and EMSL.PNNL Scientific Focus Area. The PNNL SFA will develop a predictive understanding…

Role of Microenvironments and Transition Zones in Field Scale Microbial Ecology and Biogeochemistry

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

James McKinley

Project type

Limited Scope

This is a renewal proposal for a previous collaborative effort between the PNNL Scientific Focus Area (SFA) and EMSL. The research proposed will resolve critical Hanford and basic subsurface science…

Hydro-Biogeochemical Process Dynamics in the Groundwater-Surface Water Interaction Zone

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

John Zachara

This is a renewal proposal for a previous collaborative effort between the PNNL Scientific Focus Area (SFA) and EMSL.PNNL Scientific Focus Area. The PNNL SFA will develop a predictive understanding…

Interactions Between Fe(III) - Reducing Bacteria and Fe Oxides: Microbial and Geochemical Dissolution Controls (Zachara BES-oxide), PNNL Scope #28036)

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

John Zachara

Project type

Exploratory Research

Investigate electron transfer mechanisms involved in bacterial Fe(III) oxide reduction. Work authorization text added 08/11/05: Fe(III) oxides poise the oxidation/reduction potential of…

Influences of Hydrologic Exchange Flows on River Corridor and Watershed Biogeochemical Function

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

James Stegen

We are developing predictive understanding of the processes that govern influences of hydrologic exchange flows on water quality, nutrient dynamics, and ecosystem health in dynamic river corridor…

Coupling of Fe and Tc Speciation in Subsurface Sediments: Implications to Long-Term Tc Immobilization (Zachara NABIR-Fe/Tc, PNNL Scope # 40761)

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

John Zachara

Project type

Exploratory Research

Creating an in-situ bio-barrier containing sediment-bound, biogenic FE(II) to reduce and collect mobile Tc(VII)O4 - The research objective is to provide scientific insights on the rates of reductive…

Influences of Hydrologic Exchange Flows on River Corridor and Watershed Biogeochemical Function

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

James Stegen

We are developing predictive understanding of the processes that govern influences of hydrologic exchange flows on water quality, nutrient dynamics, and ecosystem health in dynamic river corridor…

Projects