BIOCHLOR DEMO

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C.E. AzizC. J. NewellA.P. Smith Groundwater
Services, Inc.
BIOCHLOR A Screening Level Natural Attenuation
Model and Database for Solvents
J.R. GonzalesP.E. Haas Air Force Center for
Environmental Excellence
Y. Sun T.P. Clement Battelle Pacific Northwest
National Laboratory
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BIOCHLOR Model
Domenico Solution for Groundwater Transport
Reductive Dechlorination/ Sequential First Order
Rxns
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Why Use BIOCHLOR?

• Method for Estimating Plume Lengths
• System to Organize Site Data
• Tool to Help Understand Site Processes
• Screening Tool for Applicability of NA
• Supporting Line of Evidence for NA

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BIOSCREEN vs. BIOCHLOR Similarities
n Domenico Analytical Model n Microsoft Excel
Platform n User-Friendly Interface n Based on
Site Database n Free Over the Internet
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BIOSCREEN vs. BIOCHLOR Differences
BIOSCREEN
BIOCHLOR
n Petroleum Hydrocarbon Sites
BTEX n Biodegradation
n Solvent Sites n More Complex Biodegradation
- 1st Order Decay or - Electron Acceptor
Limited
- Sequential Reactions - Different Zones
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BIOCHLOR Key Processes
n Advection (1-D) n Dispersion (3-D) n
Sorption n Biodegradation - Reductive
dechlorination - Sequential reactions (parents
to daughters) - Limited hydrolysis n Different
biodegradation zones
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BIOCHLOR Model
Domenico Solution for Groundwater Transport
Reductive Dechlorination/ Sequential First Order
Rxns
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Sequential Reactions
l2
l3
l4
l1
PCE TCE DCE VC ETH
Rate PCE l 1 C PCE
Rate TCE l 1 y 1 C PCE l 2 C TCE
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Reactive Transport Equations
d CPCE
L ( CPCE ) - l 1 CPCE
Rate PCE
d t
d CTCE
L ( CPCE ) l 1 y 1 CPCE - l 2 CTCE
Rate TCE
d t
d CTCE
L ( CPCE ) l 2 y 2 CTCE - l 3 CDCE
Rate TCE
d t
etc. ...
A-D Equation (1-D advection, 3-D dispersion)
d C1
d 2C1
d 2C1
d 2C1
Dx
Dy
Dz
L ( C 1 ) v
d x
d x 2
d y 2
d z 2
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BIOCHLOR Model
Domenico Solution for Groundwater Transport
Y. Sun / T.P. Clement Transformation
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Results in BIOCHLOR
1.0
TCE
0.8
0.6
DCE
0.4
0.2
VC
0
Distance from Source
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BIOCHLOR Model Other Features
Two Reaction Zones for Mixed Sites
Zone 1
Zone 2
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BIOCHLOR Model Other Features
n Superimposed Sources (Connor et al., 1995)
n Single Vertical Plane Source
Source 1
Source 2
Source 3
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BIOCHLOR Model Summary
n Predicts Parent, Daughter Compound
Concentrations
n Provides Analytical Solution to Transport
Equations with Sequential Reactions
n Simulates Two Biodegradation Zonesfor Mixed
Sites
Zone 1
Zone 2
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BIOCHLOR Version 2.0

n Rate Constant Decision Support System n Source
Decay Option n Animation Feature
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How To Get BIOCHLOR . . .
Version 1.0
n Available on CD OR n Download free
Currently www.gsi-net.com Jan.
2000 www.epa.gov/ada/models.html ( CsMOS
Web Page )
Version 2.0
n Available Fall 2000
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BIOCHLOR Demonstration
Case Study Cape Canaveral AS, Fire Training
Area Release Solvents, degreasers, JP fuels
(1965-1985)
Site Hydrogeology
n Avg. Depth to Groundwater
5 ft BGS
1.8 x 10-2 cm/sec
n Hydraulic Conductivity
0.0012 ft/ft
n Hydraulic Gradient
n Typical Groundwater Seepage Velocity
112 ft/yr
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BIOCHLOR Interface Input Parameters
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BIOCHLOR Output
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Individual Chlorinated Solvent Output
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Array Output