Results 161 to 170 of about 603 (197)

Effect of Hydrogen on Reductive Dechlorination of Chlorinated Ethenes

Environmental Science & Technology, 1997
A methanogenic fluidized bed reactor (FBR) fed with lactate and tetrachloroethene (PCE) was operated for 14 months to study the effect of electron donor and PCE loading on chloroethene dechlorination rates. Lactate was fed continu ously at 200 mg/L (2.2 mmol/L), and the influent PCE feed concentration was increased stepwise from 3.5 to 160 μmol/L ...
Bhaskar S. Ballapragada, H. David Stensel, J. A. Puhakka, John F. Ferguson   +3 more
openaire   +1 more source

Chlorinated Ethenes from Groundwater in Tree Trunks

Environmental Science & Technology, 1998
The purpose of this investigation was to determine whether tree-core analysis could be used to delineate shallow groundwater contamination by chlorinated ethenes. Analysis of tree cores from bald cypress [Taxodium distichum (L.) Rich], tupelo (Nyssa aquatica L.), sweet gum (Liquidambar stryaciflua L.), oak (Quercus spp.), sycamore (Platanus ...
Don A. Vroblesky, Christopher T. Nietch, James T. Morris   +2 more
openaire   +1 more source

Reductive Dehalogenation of Chlorinated Ethenes with Elemental Iron: The Role of Microorganisms

Water Research, 2001
Trichloroethene (TCE) transformation and the product distribution in an aqueous medium containing zero-valent iron (Fe(0)) was investigated in the presence of an anaerobic mixed culture to assess the potential role of microorganisms in permeable iron barriers.
K J, Lampron, P C, Chiu, D K, Cha
openaire   +2 more sources

IN SITU Bioremediation Of Chlorinated Ethene Source Zones

2014
In situ bioremediation (ISB) was not initially considered a feasible technology for treating chlorinated solvent source zones, and it still faces some skepticism. However, experience over the last decade demonstrates that it is a viable technology for treating some source zones, although realistic objectives must be set.
Hans F. Stroo, Michael R. West, Bernard H. Kueper, Robert C. Borden, David W. Major, C. Herb Ward   +5 more
openaire   +1 more source

Constitutive dechlorination of chlorinated ethenes by a methanol degrading methanogenic consortium

Bioresource Technology, 2001
The ability of granular methanogenic sludge to dechlorinate chloroethenes was investigated with unadapted sludge from an upflow anaerobic sludge blanket (UASB) reactor fed with methanol. The sludge degraded chlorinated ethenes, but the degradation rates were low. The addition of primary substrate was necessary to sustain dechlorination.
van Eekert, M.H.A., Schroder, T.J., van Rhee, A., Stams, A.J.M., Schraa, G., Field, J.A.   +5 more
openaire   +3 more sources

Oxidation of Chlorinated Ethenes by Heat-Activated Persulfate:  Kinetics and Products

Environmental Science & Technology, 2006
In situ chemical oxidation (ISCO) and in situ thermal remediation (ISTR) are applicable to treatment of groundwater contaminated with chlorinated ethenes. ISCO with persulfate (S2O8(2-)) requires activation, and this can be achieved with the heat from ISTR, so there may be advantages to combining these technologies.
Rachel H, Waldemer, Paul G, Tratnyek, Richard L, Johnson, James T, Nurmi   +3 more
openaire   +2 more sources

In situ reductive dechlorination of chlorinated ethenes in high nitrate groundwater

Journal of Hazardous Materials, 2007
In situ bioremediation using carbohydrate was evaluated as an in situ treatment alternative for trichloroethene (TCE) and cis-1,2-dichloroethene (cDCE) in groundwater containing high nitrate concentrations. Upon addition of carbohydrate to groundwater, sequential reduction of electron acceptors was observed, where nitrate was reduced early in the pilot
Peter, Bennett, Deepa, Gandhi, Scott, Warner, Julia, Bussey   +3 more
openaire   +2 more sources

Bioremediation of Hexachlorocyclohexane Isomers, Chlorinated Benzenes, and Chlorinated Ethenes in Soil and Fractured Dolomite

Bioremediation Journal, 2010
ABSTRACT Groundwater at an industrial site is contaminated with α hexachlorocyclohexane (HCH) and γ -HCH (i.e., lindane) (0.3 to 0.5 ppm). Other contaminants in the 1 to 15 ppm range include 1,2,4-trichlorobenezene (TCB), 1,2-dichlorobenzene (DCB), 1,3-DCB, 1,4-DCB, chlorobenzene (CB), benzene, trichloroethene (TCE), and cis-1,2-dichloroethene (cDCE ...
Vijai Elango, James M. Cashwell, Michael J. Bellotti, Rick Marotte, David L. Freedman   +4 more
openaire   +1 more source

Dual Carbon–Chlorine Stable Isotope Investigation of Sources and Fate of Chlorinated Ethenes in Contaminated Groundwater

Environmental Science & Technology, 2012
Chlorinated ethenes (CEs) are ubiquitous groundwater contaminants, yet there remains a need for a method to efficiently monitor their in situ degradation. We report here the first field application of combined stable carbon and chlorine isotope analysis of tetrachloroethene (PCE) and trichloroethene (TCE) to investigate their biodegradation in a ...
Wiegert, Charline, Aeppli, Christoph, Knowles, Tim, Holmstrand, Henry, Evershed, Richard, Pancost, Richard D., Machackova, Jirina, Gustafsson, Orjan   +7 more
openaire   +3 more sources

The adsorption of ethene on clean and chlorine-precovered Ag(100)

Surface Science, 1994
Abstract RAIRS, in conjunction with LEED and electron spectroscopies, has been used to characterise both the low-temperature adsorption of ethene on the Ag(100) surface and the influence of preadsorbed chlorine on this adsorption. On the clean surface, ethene is found to be weakly τ-bonded at all coverages with dynamic pressures being required to ...
D.A. Slater, P. Hollins, M.A. Chesters
openaire   +1 more source