Reductive Transformation of Trichloroethene by Cobalamin:  Reactivities of the Intermediates Acetylene, Chloroacetylene, and the DCE Isomers

1998 ◽  
Vol 32 (9) ◽  
pp. 1207-1213 ◽  
Author(s):  
Marco Semadeni ◽  
Pei-Chun Chiu ◽  
Martin Reinhard
Keyword(s):  
Reductive Transformation

Reductive transformation of tetrachloroethylene to ethylene and ethane by an anaerobic filter

1997 ◽  
Vol 36 (6-7) ◽  
pp. 125-132 ◽  
Author(s):  
Toshiya Komatsu ◽  
Jun Shinmyo ◽  
Kiyoshi Momonoi
Keyword(s):  
Electron Donor ◽  
Laboratory Scale ◽  
Groundwater Contaminants ◽  
Reductive Transformation ◽  
Filter System ◽  
Anaerobic Filter ◽  
Anaerobic Microorganisms ◽  
Chlorinated Ethylenes ◽  
Start Up ◽  
Low Concentrations

Tetrachloroethylene (PCE) is one of the most common groundwater contaminants in Japan. PCE can be completely dechlorinated to ethylene (ETY) and ethane (ETA) by anaerobic microorganisms in the presence of a suitable electron donor. This study was conducted to examine the feasibility of using an anaerobic filter for the degradation of PCE in a bioremediation process. Laboratory-scale anaerobic filters were operated at 25°C using ethanol as the electron donor. Rapid start-up of the reactors was achieved by using anaerobic completely PCE-dechlorinating enrichment cultures as the inoculum. During the continuous operating periods, low concentrations (2.8 mg/L) of PCE were almost completely dechlorinated to ETY and ETA at hydraulic retention times of 49-15 hours with 100 mgCOD/L of ethanol. PCE concentrations as high as 80 mg/L was dechlorinated to ETY with a relatively low supply (200 mgCOD/L) of ethanol. Results of this study suggest that the anaerobic filter system is a feasible bioremediation process for the cleanup of groundwater which is contaminated by chlorinated ethylenes.

Effect of Redox Zonation on the Reductive Transformation ofp-Cyanonitrobenzene in a Laboratory Sediment Column

2000 ◽  
Vol 34 (17) ◽  
pp. 3617-3622 ◽  
Author(s):  
Rupert Simon ◽  
Dalizza Colón ◽  
Caroline L. Tebes-Stevens ◽  
Eric J. Weber
Keyword(s):  
Sediment Column ◽  
Reductive Transformation ◽  
Redox Zonation
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