Kinetics and Inhibition of Reductive Dechlorination of Chlorinated Ethylenes by Two Different Mixed Cultures

2005 ◽  
Vol 39 (1) ◽  
pp. 195-205 ◽  
Author(s):  
Seungho Yu ◽  
Mark E. Dolan ◽  
Lewis Semprini
Keyword(s):  
Reductive Dechlorination ◽  
Mixed Cultures ◽  
Chlorinated Ethylenes

scholarly journals Genetic Identification of a Putative Vinyl Chloride Reductase in Dehalococcoides sp. Strain BAV1

2004 ◽  
Vol 70 (10) ◽  
pp. 6347-6351 ◽  
Author(s):  
Rosa Krajmalnik-Brown ◽  
Tina Hölscher ◽  
Ivy N. Thomson ◽  
F. Michael Saunders ◽  
Kirsti M. Ritalahti ◽  
...  
Keyword(s):  
Vinyl Chloride ◽  
Reductive Dechlorination ◽  
Complete Sequence ◽  
Mixed Cultures ◽  
Genetic Identification ◽  
Degenerate Primers ◽  
Transcription Analysis ◽  
Reductive Dehalogenase ◽  
Conserved Regions ◽  
Rdase Genes

ABSTRACT Dehalococcoides sp. strain BAV1 couples growth with the reductive dechlorination of vinyl chloride (VC) to ethene. Degenerate primers targeting conserved regions in reductive dehalogenase (RDase) genes were designed and used to PCR amplify putative RDase genes from strain BAV1. Seven unique RDase gene fragments were identified. Transcription analysis of VC-grown BAV1 cultures suggested that bvcA was involved in VC reductive dechlorination, and the complete sequence of bvcA was obtained. bvcA was absent in Dehalococcoides isolates that failed to respire VC, yet was detected in four of eight VC-respiring mixed cultures.

Abiotic reductive dechlorination of chlorinated ethylenes by soil

Chemosphere ◽  
2004 ◽  
Vol 55 (5) ◽  
pp. 705-713 ◽  
Author(s):  
Woojin Lee ◽  
Bill Batchelor
Keyword(s):  
Reductive Dechlorination ◽  
Chlorinated Ethylenes

Effect of palladium on the reductive dechlorination of chlorinated ethylenes with nanoscale Pd/Fe particles

2004 ◽  
Vol 4 (5-6) ◽  
pp. 297-303
Author(s):  
H.-L. Lien ◽  
W. Zhang
Keyword(s):  
Reductive Dechlorination ◽  
Groundwater Remediation ◽  
Direct Injection ◽  
Xrd Analysis ◽  
Reaction Rates ◽  
Iron Particles ◽  
Kinetics Analysis ◽  
Excellent Performance ◽  
Chlorinated Ethylenes

Direct injection of nanoscale iron particles represents a promising technology for in-situ groundwater remediation. Nanoscale Pd/Fe particles have been shown an excellent performance for degradation of a wide array of contaminants in groundwater. The objective of this study is to investigate the nature of palladium on the reductive dechlorination of chlorinated ethylenes using nanoscale Pd/Fe particles. Kinetics analysis indicated that nanoscale Pd/Fe particles increased dechlorination rates by 1–2 orders of magnitude compared to nanoscale Fe particles alone. XRD analysis and activation energy measurement suggested that the increase of reaction rates can be attributed to the catalytic property of palladium.

scholarly journals Fraction of Electrons Consumed in Electron Acceptor Reduction and Hydrogen Thresholds as Indicators of Halorespiratory Physiology

1999 ◽  
Vol 65 (9) ◽  
pp. 4049-4056 ◽  
Author(s):  
Frank E. Löffler ◽  
James M. Tiedje ◽  
Robert A. Sanford
Keyword(s):  
Vinyl Chloride ◽  
Electron Acceptor ◽  
Reductive Dechlorination ◽  
Theoretical Calculations ◽  
Mixed Cultures ◽  
Lower Threshold ◽  
Chlorinated Compound ◽  
Hydrogen Consumption ◽  
Pure Cultures ◽  
Good Agreement

ABSTRACT Measurements of the hydrogen consumption threshold and the tracking of electrons transferred to the chlorinated electron acceptor (fe) reliably detected chlororespiratory physiology in both mixed cultures and pure cultures capable of using tetrachloroethene,cis-1,2-dichloroethene, vinyl chloride, 2-chlorophenol, 3-chlorobenzoate, 3-chloro-4-hydroxybenzoate, or 1,2-dichloropropane as an electron acceptor. Hydrogen was consumed to significantly lower threshold concentrations of less than 0.4 ppmv compared with the values obtained for the same cultures without a chlorinated compound as an electron acceptor. The fe values ranged from 0.63 to 0.7, values which are in good agreement with theoretical calculations based on the thermodynamics of reductive dechlorination as the terminal electron-accepting process. In contrast, a mixed methanogenic culture that cometabolized 3-chlorophenol exhibited a significantly lower fe value, 0.012.

Batch reactor kinetic studies on the reductive dechlorination of chlorinated ethylenes by tetrakis-(4-sulfonatophenyl)porphyrin cobalt

Chemosphere ◽  
2011 ◽  
Vol 82 (4) ◽  
pp. 592-596 ◽  
Author(s):  
Brandon R. Barnett ◽  
Alexandra L. Evans ◽  
Courtney C. Roberts ◽  
Joseph M. Fritsch
Keyword(s):  
Reductive Dechlorination ◽  
Batch Reactor ◽  
Kinetic Studies ◽  
Chlorinated Ethylenes ◽  
Reactor Kinetic
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