Abiotic reductive degradation of carbon tetrachloride in improving the contaminated groundwater
碩士 === 國立臺灣大學 === 環境工程研究所 === 84 === Groundwater is an important water resource. In this study, flow- through column experiments were conducted to investigate the reductive degradation of carbon tetrachloride(CT) while Vitamin B12 and humic...
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ndltd-TW-084NTU005150402016-07-13T04:10:54Z http://ndltd.ncl.edu.tw/handle/11443224866139234098 Abiotic reductive degradation of carbon tetrachloride in improving the contaminated groundwater 四氯化碳於地下水中非生物性還原分解復育之研究 Chang,Shuh-Kuen 張樹坤 碩士 國立臺灣大學 環境工程研究所 84 Groundwater is an important water resource. In this study, flow- through column experiments were conducted to investigate the reductive degradation of carbon tetrachloride(CT) while Vitamin B12 and humic acid were used as catalysts and titanium (III) citrate, dithiothreitol(DTT) and ferrous iron were used as reducing agents. We would probe into the influence of catalyst, reducing agent, flow and pH on the degradtioin and find out the difference between the results of column tests and model simulations. According to the results of this study, the degradation rate of carbon tetrachloride(CT) was very slow without any catalyst in the column tests, and the dimerization of carbon tetra- chloride(CT) to form hexachloroetane could not be found in this system. In the system using Vitamin B12 as a catalyst,titanium (III) citrate was a better reducing agent than dithiothreitol (DTT) and ferrous iron, and it was controlled by the formation of Vitamin B12s. After the passage of approximately 10 pore volumes of solution, the concentration profile was considered to be at steady state. In the system using humic acid as a catalyst, titanium(III) citrate could reduce carbon tetra- chloride(CT) to dichloromethane(DCM), but the other reducing agents could not. According to the results of varying flow, CT in a high flow system had shorter half-life than a low flow system, and it might be related to the intensity of mixing.In the flow-through column tests of different pH, it was found that the system with high pH has shorter half-life than system the with low pH. Di- chloromethane(DCM) was produced more than chloroform(CF) in a high pH reduction system, and it was resulted from the higher redox potenital of titanium(III) citrate. Wu,Shian-Chee 吳先琪 1996 學位論文 ; thesis 190 zh-TW |
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碩士 === 國立臺灣大學 === 環境工程研究所 === 84 === Groundwater is an important water resource. In this study, flow-
through column experiments were conducted to investigate the
reductive degradation of carbon tetrachloride(CT) while Vitamin
B12 and humic acid were used as catalysts and titanium (III)
citrate, dithiothreitol(DTT) and ferrous iron were used as
reducing agents. We would probe into the influence of
catalyst, reducing agent, flow and pH on the degradtioin and
find out the difference between the results of column tests and
model simulations. According to the results of this study, the
degradation rate of carbon tetrachloride(CT) was very slow
without any catalyst in the column tests, and the dimerization
of carbon tetra- chloride(CT) to form hexachloroetane could not
be found in this system. In the system using Vitamin B12 as a
catalyst,titanium (III) citrate was a better reducing agent
than dithiothreitol (DTT) and ferrous iron, and it was
controlled by the formation of Vitamin B12s. After the passage
of approximately 10 pore volumes of solution, the concentration
profile was considered to be at steady state. In the system
using humic acid as a catalyst, titanium(III) citrate could
reduce carbon tetra- chloride(CT) to dichloromethane(DCM), but
the other reducing agents could not. According to the results
of varying flow, CT in a high flow system had shorter half-life
than a low flow system, and it might be related to the
intensity of mixing.In the flow-through column tests of
different pH, it was found that the system with high pH has
shorter half-life than system the with low pH. Di-
chloromethane(DCM) was produced more than chloroform(CF) in a
high pH reduction system, and it was resulted from the higher
redox potenital of titanium(III) citrate.
|
author2 |
Wu,Shian-Chee |
author_facet |
Wu,Shian-Chee Chang,Shuh-Kuen 張樹坤 |
author |
Chang,Shuh-Kuen 張樹坤 |
spellingShingle |
Chang,Shuh-Kuen 張樹坤 Abiotic reductive degradation of carbon tetrachloride in improving the contaminated groundwater |
author_sort |
Chang,Shuh-Kuen |
title |
Abiotic reductive degradation of carbon tetrachloride in improving the contaminated groundwater |
title_short |
Abiotic reductive degradation of carbon tetrachloride in improving the contaminated groundwater |
title_full |
Abiotic reductive degradation of carbon tetrachloride in improving the contaminated groundwater |
title_fullStr |
Abiotic reductive degradation of carbon tetrachloride in improving the contaminated groundwater |
title_full_unstemmed |
Abiotic reductive degradation of carbon tetrachloride in improving the contaminated groundwater |
title_sort |
abiotic reductive degradation of carbon tetrachloride in improving the contaminated groundwater |
publishDate |
1996 |
url |
http://ndltd.ncl.edu.tw/handle/11443224866139234098 |
work_keys_str_mv |
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