Moffett RAB Site 26 and 28 Update
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Transcript of Moffett RAB Site 26 and 28 Update
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Abiotic / Biotic Treatability Study
Restoration Advisory Board Meeting
May 13, 2010
Installation Restoration Sites 26 and 28
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IR Site 26 Treatability Study
Purpose of Treatability Test
Determine if combined abiotic/biotic treatment is a viable remedial alternative for mitigating the remaining chlorinated ethenes (CEs) present in the upper portion of the A-aquifer at IR Site 26.
Conduct Pilot Test in area of highest CE concentration in upper A-Aquifer at Site 26
Treatability Study Method:
Pilot Test Method:
Install wells in Pilot Test area
Determine baseline conditions in pilot test area
Inject EHC® into Aquifer
Measure Distribution of EHC®
Measure changes in pilot test area geochemistry
Measure changes in pilot test area CE concentrations
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Biologically Mediated Oxidation - Reduction
Electron Donor Electron AcceptorResistor
Battery Ground
GrowthProtein Synthesis
Reproduction
CnHn
Fe(II)
H2S
H2
O2
NO3
As(V)
Mn(IV)
SO4
CO2
WorkLight bulb
Motors
Fe(0)
CO2 + H2O
Fe(III)
H2O +SO4
H2O
FeS2Fe (III)
Fe(II)
Fe(III)+SO4
H2O + CO2
HNO2
As(III)
Mn(II)
Fe (II)
S- + H2O
CH4
Reduced Oxidized Reduced Oxidized
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Biological Reductive Dechlorination of Chlorinated Ethenes
Cl
Cl
Cl
Cl
Cl
Cl
Cl
Cl
Cl
Cl
Cl
Cl
H H H HH H
PCETCE
cis 1,2 -DCE
HH
H H HHHH HH H H
VC
H H
H H H H
Ethene
0
- 50
- 200
- 150
- 250
ORP
HHHHHH
C C C C C C
Ethane-300
PCETCE
cis 1,2 -DCEVC
EtheneEthane
PCETCE
cis 1,2 -DCEVC
EtheneEthane
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HH
C CCl
Cl
Cl
Cl
Fe2+
TetrachloroetheneDichloroacetylene
Ethene
Ethane
Fe0Fe2+
Fe2+
Fe0
Abiotic Pathway
Fe2+
Fe2+
Fe0Fe0
Fe0
Fe0
O
O HH
O HH
O HH
O HH
O HH
O HH
O HH
Chloroacetylene
Acetylene
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Some Hypothesized Reaction Pathways
Biotic Abiotic
PCE
TCE
cis 1,2-DCE trans 1,2-DCE
VC
Ethene
Ethane
PCE
TCE
VC
Ethene
Ethane
Chloroacetylene
Acetylene
1,1-DCE, trans 1,2-DCE, cis1,2-DCE
Dichloroacetylene
Hydrogenolysis
β-elimination
α-elimination
Hydrogenation
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Indicators of Degradation Pathway
• Chloroacetylene
• Dichloroacetylene
Abiotic Pathway
• Acetylene
• 1,1-DCE
Biotic Pathway
• Primarily cis 1,2-DCE
• Low TCE, DCE, VC / ethene ratio• Stoichiometric Conversion
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EHC Injection Process
GW FlowDirection
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Groundwater Flow
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Radius of EHC Distribution Evaluation
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Groundwater Flow Direction
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Relative Molar Fraction of Ethenes and Ethane
Upgradient Well
Treatment Area Wells
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Relative Molar Fraction of Ethenes and Ethane
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Preliminary Conclusions Site 26 TS
• pH, ORP, SC, T, in the treatment area are within the range considered appropriate for biotic and abiotic degradation of the CEs
• DO, nitrate, arsenic, manganese, iron, sulfate and methane reducing conditions have been established in the treatment area.
• Degradation of CEs is occurring.
• Cis 1,2-DCE stall is not occurring.
• Dechlorinating microbial culture (DHC) is present in the treatment area.
• Complete conversion of CEs to non-toxic degradation products is occurring.
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26 Treatability Study Schedule
June 28, 2010 – 4th Quarter GW Sampling Event
August 25, 2010 -Draft Treatability Study Results Technical Memorandum
October 27, 2010 -Final Treatability Study Results Technical Memorandum
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Conduct Concurrent Pilot Tests in Three High Concentration Areas:
Evaluate Three Technologies:
In Situ Anaerobic Biotic/Abiotic Degradation (ISABA)
In Situ Anaerobic Biostimulation with Bioaugmentation (ISABB) Process
Building 88 Area
Traffic Island Area
Well W9-18 Area
Sodium Lactate & SDC-9
Emulsified Oil & SDC-9
Expanded Pilot Test (Site 28) Methodology
EHC
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ISABA - EHC
ISABB - Emulsfied Oil & SDC-9
ISABB - Lactate & SDC-9
Task 1 Conduct MIPs Investigation
Task 2 Install Monitoring Wells
Task 3 Inject Substrates
Expanded Pilot Test Site 28
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Site 28 Pilot Test Schedule
February 2010 - Work Plans Finalized
March 2010 - MIPs Investigation
May 2010 -Treatability Study Progress Report
July, 2010 - Substrate Injection
August 2010 to July 2011 - Performance Monitoring
October 2011 – Treatability Study Final Report
June, 2010 – Monitoring Well Installation