pennoni associates inc. consulting engineers - … · providing engineering services since 1966...
TRANSCRIPT
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Providing Engineering Services Since 1966
Pennoni Associates Inc. Consulting Engineers
SUCCESSFUL ERD PILOT STUDY IN RESIDUAL DNAPL UTILIZING A SIMPLE
ADDITIVE DELIVERY APPROACH
I. Richard Schaffner and Kevin J. Davis, P.E.; Pennoni Associates, Inc. Kent C. Armstrong, BioStryke Remediation Products, LLC
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Presentation Outline
ERD Review
Site Background
Pilot Study Methods
Results
Conclusions
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ERD Review
• RD = Substitution of H for Cl
• Environmental Conditions
– Anaerobic (<0.5 mg/L DO) – Chemically Reducing (<50 mV) – Hydrogen – ‘fuel for dechlorination’
• Mechanisms
– Metabolic (Dehalorespiration) – Co-metabolic (minor mechanism) – Abiotic reactions (e.g., FeS) – Solubilization (co-solvency) Dehalococcoides
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Electron Ladder Theory
Unifying Field Theory of Microbial Respiration Organic Carbon
Oxygen H2O
Mn (IV)
Mn (III)
Iron (III) Iron (II)
Sulfate H2S
CO CH4
cVOCs Ethene / Ethane
2
ERD
Nitrate NH+, N2
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Site Background
Site History: Electronics Manufacturer, East Central Ohio Incidental TCE Spillage
Conceptual Site Model: ~15’ to ~20’ of Overburden (Sand, Silt, Clay) Fractured Sandstone / Shale contact at 15’ to 20’ Bedrock Impacted Zone ~10 feet Thick Baseline cVOC Signature:
- Total Parents: ~50 - 550 ppm; TCE - Total Daughters: ~10 - 15 ppm; 1,2-DCE - Parent Fraction: 80% - 99%
P&T Implemented to Manage Migration Operational since 2005
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Conceptual Site Model
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Pilot Study Methods
• PRSs with ERDENHANCED™ (BioStryke Remediation Products, LLC)
– Baseline no purge sampling – PRS deployment – No-purge perform. sampling
• VOCs + MNA Indicators • CENSUS® Assay
• PRS deployment units replaced when depleted (every 6-8 weeks)
• Provides Go-No-Go Efficacy Evaluation
• Performed under actual site biogeochemical conditions
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Well with deployed PRS
Ground surface
Groundwater Flow Direction
Graphical Representation, To
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Well with deployed PRS
Ground surface
Groundwater Flow Direction
Graphical Representation, To+1
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Well with deployed PRS
Ground surface
Groundwater Flow Direction
Graphical Representation, To+2
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Well with deployed PRS
Ground surface
Groundwater Flow Direction
Graphical Representation, To+3
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Well with deployed PRS
Ground surface
Groundwater Flow Direction
Graphical Representation, To+4
Area of Influence
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Results, TCE
1
10
100
1000
10000
100000
1000000
7/10/2012 10/18/2012 1/26/2013 5/6/2013 8/14/2013 11/22/2013 3/2/2014 6/10/2014
TC
E (
µg/L
)
Date (mm/dd/yyyy)
MW-30A
MW-31A
MW-38A
Bas
elin
e
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Results, c-1,2-DCE
1
10
100
1000
10000
100000
7/10/2012 10/18/2012 1/26/2013 5/6/2013 8/14/2013 11/22/2013 3/2/2014 6/10/2014
TC
E (
µg/L
)
Date (mm/dd/yyyy)
MW-30A
MW-31A
MW-38A
Bas
elin
e
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Results, MW-30A
1.00E-09
1.00E-08
1.00E-07
1.00E-06
1.00E-05
1.00E-04
1.00E-03
1.00E-02
1.00E-01
1.00E+00
7/10/2012 10/18/2012 1/26/2013 5/6/2013 8/14/2013 11/22/2013 3/2/2014 6/10/2014
Mo
lari
ty (
mo
l/L)
Date (mm/dd/yyyy)
TCE
c-1,2-DCEB
asel
ine
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Results, MW-31A
0.00E+00
5.00E-05
1.00E-04
1.50E-04
2.00E-04
2.50E-04
3.00E-04
3.50E-04
4.00E-04
4.50E-04
10/18/2012 5/6/2013 11/22/2013 6/10/2014
Mo
lari
ty (
mo
l/L)
Date (mm/dd/yyyy)
TCE
c-1,2-DCE
Bas
elin
e
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Results, MW-38A
1.00E-05
1.00E-04
1.00E-03
1.00E-02
7/10/2012 10/18/2012 1/26/2013 5/6/2013 8/14/2013 11/22/2013 3/2/2014 6/10/2014
Mo
lari
ty (
mo
l/L)
Date (mm/dd/yyyy)
TCE
c-1,2-DCEB
asel
ine
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Results, Molar Parent Fraction
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
1/26/2013 5/6/2013 8/14/2013 11/22/2013 3/2/2014 6/10/2014
Mo
lar
Par
ent
Fra
ctio
n (
%)
Date (mm/dd/yyyy)
MW-30A
MW-31A
MW-32A
MW-38A
Bas
elin
e
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MNA Parameters:
– Up to 1,000X [diss Fe/Mn] increase
– General decrease in [sulfate]
– General decrease in ORP values
– General increase in [methane]
– Spiked increases in [TOC] following each PRS replacement-deployment event
– Elevated [Ethene] & [Ethane]
Results
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Results
CENSUS® Assay: – BioTraps® for each well amended with
ERDENHANCED™ filled PRS deployment units
» Generally positive bio-indicator values » tceA gene, bvcA gene, vcrA gene
– BioTrap® for background well non-detect for same parameters.
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CONCLUSIONS
Baseline [TCE] 55-550 mg/L
80-99.9%REDUCTION in [TCE] over ~1 year
MNA indicator signatures consistent with reductive dechlorination
Positive change in microbial community and treatment zone geochemistry to favor dechlorinators
Evidence of both biotic and abiotic dechlorination
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Questions
I. Richard Schaffner, Jr. Senior Consultant / Hydrogeologist
Office 856-656-2887 | Mobile 603-703-3887
Kent C. Armstrong BioStryke® Remediation Products, LLC