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DECHLORONATION OF TRICHLOROETHYLENE USING
ZEROVALENT IRON
July 27, 2000
The University of Oklahoma
Research Experience for Undergraduates (REU)
by: Matthew Jefferson
ACKNOWLEDGMENTS
• National Science Foundation
• OU CEES
• REU Professor:
– Dr. Elizabeth Butler
• Graduate Students:
– Meera Subramanim
– Maria Leonor Támara
OVERVIEW
• Background
• Research Question
• Materials and Methods
• Procedure
• Results
• Conclusion/ Recommendations
BACKGROUND
• Remediation– Passive Treatment
– Replacement Reaction
• Why Do We Care?
RESEARCH QESTION
• How do different types of iron affect the dechlorination by-products of trichloroethylene (TCE)?
METHODS AND MATERIALS
• Shimazu Gas Chromatograph
GAS CHROMATOGRAPH
METHODS AND MATERIALS
• Shimazu Gas Chromatograph
• Three Irons
METHODS AND MATERIALS
• Shimazu Gas Chromatograph
• Three Irons
• Chlorinated Compounds
TESTING PROCEDURE
• Dechloronation Experiment– Sample Preparation
• Irons
• Tris Buffer
• TCE Spike Solution
• Anaerobic Conditions
– Platform Shaker
Vial Cap
Tris-buffer
Iron
6 mL Vial
PLATFORM SHAKER
TESTING PROCEDURE
• Dechlorination Experiment– Sampling Procedure
• Liquid• Gas
• QA/QC– GC Accuracy– Mixing vs. Time
PLATFORM MIXING
MIXING EXPERIMENT
Mixing Time vs. Concentraion of TCE
6.00E-07
7.00E-07
8.00E-07
9.00E-07
1.00E-06
1.10E-06
0 10 20 30 40
Time (min)
Con
c (M
)
EXPERIMENTAL RESULTS
• Duration
• General Trends/Observations– Dechlorination– First Order Rate Law
Rates for Fisher Electrolytic
y = 1.992E-05e-8.745E-03x
R2 = 8.915E-01
0
0.000003
0.000006
0.000009
0.000012
0.000015
0.000018
0.000021
0 100 200 300 400 500 600
Time (hrs)
Con
c. o
f TC
E (M
)
Fisher Electrolytic Blank Rate Law
Rates for Peerless Iron
y = 8.573E-06e-4.063E-03x
R2 = 3.444E-01
0.000E+00
3.000E-06
6.000E-06
9.000E-06
1.200E-05
1.500E-05
1.800E-05
2.100E-05
0 100 200 300 400 500 600
Time (hrs)
Con
c. o
f TC
E (M
)
Peerless Iron Blank Rate Law
Rates for Fisher Filings
0.000E+00
3.000E-06
6.000E-06
9.000E-06
1.200E-05
1.500E-05
1.800E-05
2.100E-05
0 100 200 300 400 500 600
Time (hrs)
Con
c. o
f TC
E (M
)
Fisher Filings Blank
EXPERIMENTAL RESULTS
• Duration
• General Trends/Observations– Dechlorination– First Order Rate Law
• Problems– Preliminary Data– GC Calibration
• Reaction by-products• Experimental Data
Rates for Fisher Filings
0.000E+00
3.000E-06
6.000E-06
9.000E-06
1.200E-05
1.500E-05
1.800E-05
2.100E-05
0 100 200 300 400 500 600
Time (hrs)
Con
c. o
f TC
E (M
)
Fisher Filings Blank
IN SUMMARY...
• Inconclusive
• More Research– Reproducibility– Fix problems– Reaction by-products– Controlling the reaction
QUESTIONS?