The study of TCE remove by autotrophic hydrogen-bacteria combined with zero-valence nickel
Date Issued
2005
Date
2005
Author(s)
Tu, Min-Fei
DOI
zh-TW
Abstract
Chlorinated organic compounds are widely used in industrial process and one of the most common and critical contaminant is known as Trichloroethylene (TCE), which contaminated soil and groundwater easily due to inappropriate treatment or storage. Recently, many researches were made to investigate practicable methods for TCE removing via biological, physical or chemical process, however, few were considered to be both effective and economic. This research is to develop a more practicable and feasible method for TCE treatment with a combined biological and chemical process based on synergetic dechlorination reactions by microorganisms and zero-valent metals.
The experiments were carried out by using a combined zero-valent nickel and autotrophic hydrogen-bacteria system and compared with individual systems. The results suggest that hydrogen provided promote biological dechlorination in the individually biological system, TCE was dechlorinated to alkanes completely with no chlorinated intermediates were detected. In zero-valent metal systems, the dechlorination rate was proportional to the amount of metal added, also, supplying of hydrogen gas increased reaction rate possibly by suppressing the ionization of zero-valent metals (60% decrease in ionic form), however, trace-amount accumulation of chloroethylene was observed.
Dechlorination rate of TCE by combined biological and zero-valent metal process was higher than individual ones, further dechlorination of chloroethylene also demonstrated synergetic effects by this combined system, however, the biological system showed limited enhancement which may caused by insufficient effectiveness of hydrogen gas supply.
The PVA-alginic acid immobilized zero-valance nickel still had the dechlorination ability, so the immobilized zero-valance nickel can do the further research in the continue flow test.
Subjects
三氯乙烯
氫細菌
鎳金屬
還原脫氯
TCE
hydrogen bacteria
nickel
reductive dechlorination
Type
thesis
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