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This is to certify that the
thesis entitled

Abiotic Transformation of Halogenated
Aliphatic Compounds by Iron Powder

presented by
Chien-Ping Hung

has been accepted towards fulfillment
of the requirements for

_M.S..___ degree in _C.:L1L:LL_&_Environmental
Engineering

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Major professor

Date November 16, 1993

0-7639 MS U i: an Affirmative Action/Equal Opportunity Institution

 

 

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Mlchlgan State
Unlverelty

 

 

 

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ABIOTIC TRANSFORMATION OF HALOGENATED.
ALIPHATIC COMPOUNDS BY IRON POWDER

BY

Chien-Ping Hung

A THESIS

Submitted to
Michigan State University
in partial fulfillment of the requirements
for the degree of

MASTER OF SCIENCE

Department of Civil and Environmental Engineering

1993

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ABSTRACT

ABIOTIC TRANSFORMATION OF HALOGENATED ALIPHATIC
COMPOUNDS BY IRON POWDER

BY

Chien-Ping Hung

This research is a preliminary study of the dehalogenation of
halogenated aliphatic compounds in the presence of iron powder. The
haloaliphatics evaluated in this study include carbon tetrachloride
(CT), l,1,1,-trichloroethane (TCA), trichloroethylene (TCE) and
tetrachloroethylene (PCE). Variables evaluated include temperature,
pH, haloaliphatics concentration and buffer type. Pseudo-first-order
kinetics were used to quantify the reaction kinetics of CT and TCE;
zero order kinetics were used for TCA.

In the iron-mediated reactions, phosphate appears to play a
central role in promoting dechlorination. The order of reactivity was:
C’I> 1,1,1,-TCA> TCE> PCE. The reaction rate was temperature and pH

dependent. Highest rates occurred at high temperature and low pH.

This thesis is dedicated to my family, whom I love.

iii

ACKNOWLEDGMENTS

First, I would like to express my gratitude and appreciation to
my parents who encourage me and support me to complete my
master degree in America.

I would like to thank my advisor Dr. Craig Criddle for his
guidance and help. To a foreign student, his help was invaluable. I
must also express my appreciation to those who helped me with this
study.

Finally, I must especially thank my friend Huishin for her

valuable help.

iv