Chlorinated ethenes
WebChloroflexi. They identified Chloroflexi (32±9%), Proteobacteria (18±5%), Bacteroidetes (11±6%), and Firmicutes (9±6%) as the core phyla of the Bacteria domain present in the … WebThe kinetics of chlorinated ethene disappearance were pseudo-first-order for 1−2 half-lives, and the resulting rate constantsmeasured from 30 to 70 °Cfit the Arrhenius equation, yielding apparent activation energies of 101 ± 4 kJ mol-1for tetrachloroethene (PCE), 108 ± 3 kJ mol-1for trichloroethene (TCE), 144 ± 5 kJ mol-1for …
Chlorinated ethenes
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WebMay 18, 2015 · ABSTRACT: Past disposal practices at Dover Air Force Base (AFB), Delaware, created a large solvent plume called Area 6 (about 1 mile long, 2,000 feet wide, and 345 acres). The main contaminants are PCE, TCE, and their degradation products. The remedy is in-situ accelerated anaerobic bioremediation (AAB). AAB started in 2006 and … WebNov 19, 2007 · Chlorinated ethenes were analyzed by gas chromatography (GC)/mass spectrometry following sample preparation according to EPA Method 5030B and analysis …
WebOct 1, 2005 · The results indicate that persulfate oxidation mechanisms are effective in degrading many VOCs including chlorinated ethenes (CEs), BTEXs and trichloroethanes that are frequently detected in the subsurface at contaminated sites. WebUnder anaerobic conditions, chlorinated ethanes are susceptible to reductive dechlorination by several groups of halorespiring bacteria, most notably Dehalobacter …
WebBiostimulation is widely used to enhance reductive dechlorination of chlorinated ethenes in contaminated aquifers. However, the knowledge on corresponding biogeochemical responses is limited. In this study, glycerol was injected in an aquifer contaminated with cis-dichloroethene (cDCE), and geochemical and microbial shifts were followed for 265 ... WebThe kinetics of chlorinated ethene disappearance were pseudo-first-order for 1−2 half-lives, and the resulting rate constantsmeasured from 30 to 70 °Cfit the Arrhenius equation, …
Web- 3 - Chlorinated ethenes and other chlorinated solvents can be co-oxidized by a wide range of oxygenase-expressing microbes including those that utilize methane1-3, ethene and ethane4, 5, propane6-9, phenol10- 12, or toluene13, 14 as energy and carbon sources. In general terms, the potential for aerobic cometabolism to contribute to contaminant …
WebMay 31, 2016 · In general, cometabolism of chlorinated ethenes is mediated by monooxygenase enzymes with “relaxed” specificity that oxidize a primary, growth … kelly scientific resources dallas txWebJun 13, 2024 · Chlorinated ethenes (CEs) are widely used as degreasing agents and dry cleaning solvents. Tetrachloroethene (PCE) and … lb prince\\u0027s-featherWebThe chlorinated ethenes and hexachloroethane react only with hydroxide under severe conditions and exhibit no neutral hydrolysis. Some of these compounds eliminate HCl, whereas others substitute OH for Cl to form alcohols that may react further to give aldehydes or carboxylic acids as products. Environmental hydrolysis half-lives (25 C, pH … lb priority\\u0027slb priority\u0027sWebChlorinated ethenes are prevalent groundwater contaminants. To better constrain (bio)chemical reaction mechanisms of reductive dechlorination, the position-specificity of reductive trichloroethene (TCE) dehalogenation was investigated. Selective biotransformation reactions (i) of tetrachloroethene (PCE) to TCE in cultures of … lbpsb 2022 school startWebAug 15, 2005 · All chlorinated ethanes except 1,2-DCA were transformed to less chlorinated ethanes or ethenes. The surface-area-normalized rate constants from first … lb precision sheet metal works limitedWebApr 20, 2024 · Sulfidized nanoscale zerovalent iron (SNZVI) with desirable properties and reactivity has recently emerged as a promising groundwater remediation agent. However, little information is available on how the molecular structure of chlorinated ethenes (CEs) affects their dechlorination by SNZVI or whether the sulfur content of SNZVI can alter … lbpsb electricity