2010 long-term surveillance and maintenance conference applied science and technology for the u.s....
TRANSCRIPT
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Applied Science and Technology for the U.S. Department of
Energy Office of Legacy
Management
Grand Junction, ColoradoNovember 2010
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Today’s Format
Two-hour session to accommodate facilitated discussion Presentation on the U.S. Department of Energy’s Office of
Legacy Management (LM) Applied Science & Technology (AS&T) program
Introduce Panel – brief summaries Break? Proposed discussion topics Full audience participation Goal: discuss opinions on future direction of Goal: discuss opinions on future direction of
groundwater research for long-term surveillance and groundwater research for long-term surveillance and maintenance (LTS&M) maintenance (LTS&M)
Product: chart of favorable areas for applied research for Product: chart of favorable areas for applied research for groundwater remediationgroundwater remediation
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AS&T Subtask
LM provides funding through AS&T to: Evaluate technologies to improve LTS&M
remediation strategies. Solve mechanical and chemical problems in LM activities
at sites. Use technologies to make remedies more sustainable.
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Two Main Areas of Emphasis
Groundwater projects Surface projects (disposal cell covers, phytoremediation)
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Map of LM Sites
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Main Contaminants
Uranium Nitrate Sulfate Ammonium Vanadium Molybdenum Selenium Arsenic Volatile organic compounds (VOCs) Fission products (e.g., tritium)
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AS&T Projects Analysis Charts
Only includes projects within AS&T; includes some projects from LM predecessor [Office of Environmental Management (EM)]
Includes many other projects in LM that have technology innovations; e.g., Rocky Flats, Pinellas, Central Nevada Test Area
There are lumpers and splitters; organized by project reports
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AS&T Projects by Breadth of Application
Site Specific
Cross Cutting
Wide Application
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AS&T Projects by Cost
Low (<$100K)
Moderate High (>$500K)
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AS&T Projects by Technology Type
Characterization
Treatability
Performance Assessment
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Monitoring (MNA)
PRB-ZVI
Pump-and-Treat
Other (phytoremediation,
in-situ, etc.)
AS&T Projects by Remediation Approach
AS&T Projects by Remediation Approach
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U
NO3SO4
VOC
As, Mo, Se, V3H
LM Site Contaminants
U
NO3
SO4
VOC
As, Mo, Se, V
AS&T Projects by Contaminant
LM Site Contaminants
AS&T Projects by Contaminant
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ContaminantPlume
Flow
Permeable Reactive Barrier
Trench (filled)
Aquifer
Permeable Reactive Barrier (PRB): Evolution of an Applied Research Project
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Approach
1998: Laboratory treatability studies 1998: Field columns Geochemical modeling 1999: PRB installation 1999–2010: Performance evaluation
Routine groundwater sampling Two episodes of coring/analysis Tracer testing Residence time determination using 222Rn Four episodes of hydraulic conductivity testing
2005: Treatment cells installed
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Geochemical Modeling: Mineral Zonation in Approach to ZVI Saturation
ZVI Dissolved (mol/L)
Co
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mo
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0.00E+00
1.00E-03
2.00E-03
3.00E-03
4.00E-03
5.00E-03
6.00E-03
7.00E-03
8.00E-03
9.00E-03
1.00E-02
0.000 0.020 0.040 0.060 0.080 0.100 0.120 0.140 0.160 0.180 0.200
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4
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pH
Dissolved C(4)
Dissolved C(-4)
Calcite
pH
ZVIMethane + Sulfide + Fe(OH)2Calcite+
Fe(OH)2
Calcite +Sulfide +Fe(OH)2
ZVI Dissolved (mol/L)
Co
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0.00E+00
1.00E-03
2.00E-03
3.00E-03
4.00E-03
5.00E-03
6.00E-03
7.00E-03
8.00E-03
9.00E-03
1.00E-02
0.000 0.020 0.040 0.060 0.080 0.100 0.120 0.140 0.160 0.180 0.200
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pH
Dissolved C(4)
Dissolved C(-4)
Calcite
pH
ZVIMethane + Sulfide + Fe(OH)2Calcite+
Fe(OH)2
Calcite +Sulfide +Fe(OH)2
ZVI Dissolved (mol/L)
Co
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ntr
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n (
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0.00E+00
1.00E-03
2.00E-03
3.00E-03
4.00E-03
5.00E-03
6.00E-03
7.00E-03
8.00E-03
9.00E-03
1.00E-02
0.000 0.020 0.040 0.060 0.080 0.100 0.120 0.140 0.160 0.180 0.200
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0.00E+00
1.00E-03
2.00E-03
3.00E-03
4.00E-03
5.00E-03
6.00E-03
7.00E-03
8.00E-03
9.00E-03
1.00E-02
0.000 0.020 0.040 0.060 0.080 0.100 0.120 0.140 0.160 0.180 0.200
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pH
Dissolved C(4)
Dissolved C(-4)
Calcite
pH
ZVIMethane + Sulfide + Fe(OH)2Calcite+
Fe(OH)2
Calcite +Sulfide +Fe(OH)2
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PRB Installation
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Coring for Performance Evaluation
9 tons of calcite deposited in the first 3 years
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Hydraulic Conductivity
in Monticello PRB After 4 Years
Red = low conductivity
-4 .5
-4
-3 .5
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-2 .5
-2
log K (cm /s)
GroundwaterFlow
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Performance Evaluation:Hydraulic Conductivity
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PRB Performance: Mineralization of ZVI
Electron microprobe photomicrographof core material
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Residence Time Dependency
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Implementation of Treatment Cells
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Chelate Enhancement ofZero-Valent Iron Treatment
LM Sites
SOARS Sites
LM Sites and System Operations and Analysis at Remote Sites (SOARS)
Mound
Lakeview
Rocky Flats
Shiprock
Monument Valley
Monticello
Green River Old RifleCentralNevada
Test Area
Weldon Spring
Salmon
New Rifle
Durango
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SOARS System Innovations
Post processor allows instant access by all LM personnel; reliable means to record notes on activities
Use of three-point calculations that automatically plot the orientation and velocity of groundwater
Remote collection of tracer data (rhodamine) Remote operation of well pumps (automated pump tests)
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Summary: LM’s AS&T Program (Groundwater)1. Operate geochemical/ecological laboratory
2. Operate SOARS telemetry system
3. Conduct applied scientific research
4. Directions to date have emphasized: Low cost Site-specific projects Radionuclide/sulfate/nitrate/oxyanion contaminants Site characterization/remediation
What directions should applied science for What directions should applied science for legacy management be going?legacy management be going?
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Session
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Suggested Discussion Topics
Big or small science Promising technologies for groundwater remediation.
What should LM’s role be? What are other agencies (e.g., DOE-EM, DOE Office
of Science, U.S. Department of Defense, Armys Corps, U.S. Geological Survey, U.S. Environmental Protection Agency) doing? Overlap?
Basic research vs. applied research vs. project support Groundwater remediation vs. point-of-use treatment
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Suggested Discussion Topics (continued) Groundwater contamination
Is it better to stabilize groundwater contamination (e.g., acetate injection) or enhance removal (e.g., in-situ leaching with oxidant and carbonate for uranium)?
Monitored natural attenuation (MNA) How much emphasis? Is this going to be the future? How to approach MNA? Major issues and future of research?
Technical impracticability What is it and what role does it play?