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Reductive Dehalogenation Of Trichloroethylene By Zero Valent Iron And Multiphase Transport Model
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Book Synopsis Reductive Dehalogenation of Trichloroethylene by Zero-valent Iron and Multiphase Transport Model by : Jayant K. Gotpagar
Download or read book Reductive Dehalogenation of Trichloroethylene by Zero-valent Iron and Multiphase Transport Model written by Jayant K. Gotpagar and published by . This book was released on 1998 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reductive Dehalogenation of Trichloroethylene Using Zero-Valent Iron by : J. Gotpagar
Download or read book Reductive Dehalogenation of Trichloroethylene Using Zero-Valent Iron written by J. Gotpagar and published by . This book was released on 1996 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Explorations Into the Mechanism and Kinetics of the Reduction of Trichloroethylene Using Model Complexes of Cobalamin and Zero-valent Iron by : Angela Dee Follett
Download or read book Explorations Into the Mechanism and Kinetics of the Reduction of Trichloroethylene Using Model Complexes of Cobalamin and Zero-valent Iron written by Angela Dee Follett and published by . This book was released on 2006 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Factors Affecting the Reductive Dechlorination of Carbon Tetrachloride by Zero-valent Iron by : Amanda S. Mutziger
Download or read book Factors Affecting the Reductive Dechlorination of Carbon Tetrachloride by Zero-valent Iron written by Amanda S. Mutziger and published by . This book was released on 1996 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1999 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Model to Characterize the Kinetics of Dechlorination of Tetrachloroethylene and Trichloroethylene By a Zero Valent Iron Permeable Reactive Barrier by : Signe Martha Ulsamer
Download or read book A Model to Characterize the Kinetics of Dechlorination of Tetrachloroethylene and Trichloroethylene By a Zero Valent Iron Permeable Reactive Barrier written by Signe Martha Ulsamer and published by . This book was released on 2011 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: A one dimensional, multiple reaction pathway model of the dechlorination reactions of trichloroethylene (TCE) and tetrachloroethylene (PCE) as these species pass through a zero valent iron permeable reactive barrier (PRB) was produced. Three different types of rate equations were tested; first order, surface controlled with interspecies competition, and surface controlled with inter and intra species competition. The first order rate equations predicted the most accurate results when compared to actual data from permeable reactive barriers. Sensitivity analysis shows that the most important variable in determining TCE concentration in the barrier is the first order rate constant for the degradation of TCE. The velocity of the water through the barrier is the second most important variable determining TCE concentration. For PCE the concentration in the barrier is most sensitive to the velocity of the water and to the first order degradation rate constant for the PCE to dichloroacetylene reaction. Overall, zero valent iron barriers are more effective for the treatment of TCE than PCE.
Book Synopsis Trichloroethylene Degradation by Mixed Culture and Zero-valent Iron by : Kaili Qian
Download or read book Trichloroethylene Degradation by Mixed Culture and Zero-valent Iron written by Kaili Qian and published by . This book was released on 2010 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Kinetics of Enhanced Dechlorination of Trichloroethylene Using Zero-valent Iron by : Gregory V. Lowry
Download or read book Kinetics of Enhanced Dechlorination of Trichloroethylene Using Zero-valent Iron written by Gregory V. Lowry and published by . This book was released on 1995 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electrochemical Reduction of Trichloroethylene Using Zero-valent Iron as Cathode Material by : Isaac Amponsah
Download or read book Electrochemical Reduction of Trichloroethylene Using Zero-valent Iron as Cathode Material written by Isaac Amponsah and published by . This book was released on 2004 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Evaluates the effects of external cathodic current on the trichloroethylene (TCE) degradation rate by zero-value iron (ZVI). Sets up a bench scale test and a reactor where electrolytic reduction can take place.
Book Synopsis Rates of Trichloroethylene Reduction in Passivated Zero-valent Iron Upon Application of Low-level Direct Current by : Mengwen Zhang
Download or read book Rates of Trichloroethylene Reduction in Passivated Zero-valent Iron Upon Application of Low-level Direct Current written by Mengwen Zhang and published by . This book was released on 2014 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: Permeable reactive barriers (PRB) containing zero-valent iron (ZVI) have been used for the in situ remediation of groundwater contaminated with trichloroethylene (TCE) for almost two decades; however, ZVI is susceptible to passivation over time, which greatly reduces its treatment efficiency. Several recent studies have suggested that electrically-induced reduction (EIR), the application of low-level direct current, may restore the reactivity of passivated ZVI in situ. In this study, a continuous-flow column reactor was fabricated to treat TCE-contaminated groundwater and assess the effects of low-voltage direct current (0-12 V) on abiotic TCE reduction. In experiments with partially passivated ZVI, application of current increased the rate and the extent of abiotic TCE reduction; both were correlated with voltage. Based on calculated reaction rate coefficients, TCE reduction in passivated ZVI is a first-order reaction. While several mechanisms contribute to the abiotic reduction of TCE in passivated ZVI, they are difficult to isolate experimentally.
Book Synopsis Zero Valent Iron Nanoparticles by : Ruchi Bipinbhai Shah
Download or read book Zero Valent Iron Nanoparticles written by Ruchi Bipinbhai Shah and published by . This book was released on 2008 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Admicelle-catalyzed Reductive Dechlorination of Perchloroethylene (PCE) by Zero Valent Iron by : Zhaohui Li
Download or read book Admicelle-catalyzed Reductive Dechlorination of Perchloroethylene (PCE) by Zero Valent Iron written by Zhaohui Li and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reaction Rates for the Dehalogenation of Trichloroethylene Using Various Types of Zero-valent Iron by : Neil A. Stewart
Download or read book Reaction Rates for the Dehalogenation of Trichloroethylene Using Various Types of Zero-valent Iron written by Neil A. Stewart and published by . This book was released on 2005 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: The data obtained produced linear first order rate plots from which dehalogenation rate constants were obtained. The rate constants were normalized by iron mass, solution volume, and surface area. The pretreatment techniques employed in this study, including ultrasonication and acid washing, demonstrated a beneficial effect by removing oxide precipitates from the iron surface, thus increasing the reactivity of the iron. Mass loading studies revealed how physical factors, associated with the experimental setup, could influence reaction rates. Surface area studies confirmed that the smaller iron particles, such as the nanoscale iron, have a greater surface area per unit mass. The large mass and volume normalized rate constant, k[subscript MV], obtained for the nanoscale iron was a result of this high surface area. However, the calculated surface area normalized rate constant, k[subscript SA], for the nanoscale iron was significantly lower than those for the granular iron samples tested. It was concluded that differences in surface area normalized rate constants, between different iron particle types, could be attributed to inherent characteristics of the iron, such as composition and crystal structure.
Book Synopsis Effect of Zero Valent Iron and Chemical Interactions by Trichloroethene on Perchlorate Biodegradation in Contaminated Groundwater by : Kun Yang
Download or read book Effect of Zero Valent Iron and Chemical Interactions by Trichloroethene on Perchlorate Biodegradation in Contaminated Groundwater written by Kun Yang and published by . This book was released on 2007 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Enhancement of Trichloroethylene (TCE) Removal by Electrically-induced Reduction in a Passivated Zero-valent Iron Column Reactor by : Hua Wang
Download or read book Enhancement of Trichloroethylene (TCE) Removal by Electrically-induced Reduction in a Passivated Zero-valent Iron Column Reactor written by Hua Wang and published by . This book was released on 2013 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: Trichloroethylene (TCE) is a volatile, chlorinated aliphatic organic compound. It has been used ubiquitously as an ingredient in industrial cleaning agents and as a degreasing agent, which has resulted in widespread contamination of groundwater. Since TCE is a highly oxidized compound, reduction reactions are considered a promising way to treat it. Permeable reactive barriers (PRB) containing highly-reducing reactive media [e.g., zero-valent iron (Fe° or ZVI)] have been successfully used in situ to remediate TCE in groundwater. There have been more than 200 ZVI PRBs installed worldwide since the mid-1990s. Despite their promise, ZVI PRBs are susceptible to passivation over time, largely due to oxidation of the Fe° by dissolved oxygen or nitrate. Several recent studies have suggested that electrically-induced reduction (EIR) is a promising approach to restore reductive activity in passivated ZVI PRBs. The overall objectives of this study were to simulate in the laboratory a ZVI PRB to remediate TCE-contaminated groundwater and systematically evaluate the effect of applying direct current. Results suggest that: (1) any enhancements in the rate or extent of TCE removal in `fresh' ZVI that may be the result of application of direct current are indistinguishable from those due to TCE reduction by ZVI alone; (2) upon application of direct current (6V and 12V) to partially passivated ZVI, a significant improvement in TCE reduction was observed; (3) the longevity of ZVI de-passivated by EIR was not determined, but preliminary results suggest the observed effect may be short-lived and be due to direct reduction of TCE by electrons; and (4) experiments in a partially passivated ZVI-sand column suggest that observed enhancements in TCE removal are correlated with voltage, with higher current densities resulting in faster rates of TCE reduction.
Book Synopsis Column Studies to Determine the Effects of PH on the Dechlorination of Trichloroethene by Zero-valent Iron by : Christopher Warren Lewter
Download or read book Column Studies to Determine the Effects of PH on the Dechlorination of Trichloroethene by Zero-valent Iron written by Christopher Warren Lewter and published by . This book was released on 2002 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Performs column studies to determine the effects of pH and EDTA (ethylenediaminetetraacetic acid) concentration on the degradation of TCE (trichloroethene) by ZVI (zero-valent iron). The aim of the study is to provide additional kinetic data for more efficient methods of using ZVI for the remediation of TCE-contaminated groundwaters.
Book Synopsis Processes Affecting Reductive Dechlorination of Chlorinated Solvents by Zero-Valent Iron by : Leah J. Matheson
Download or read book Processes Affecting Reductive Dechlorination of Chlorinated Solvents by Zero-Valent Iron written by Leah J. Matheson and published by . This book was released on 1993 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zero-valent iron may participate in the reductive dechlorination process by three different mechanisms: direct, electrolytic reduction; reduction by hydrogen produced during the corrosion process; and reduction by dissolved (ferrous) iron that is also produced by corroding iron. The first step of electrolytic reduction is presumably, the transfer of one electron from the metal surface to the organic molecule. This results in an organic anion radical that may then lose a halide anion to give a carbon-centered radical, and oxidized iron, which is eventually released to the solution as Fe(2+). The goal of our research is to provide a comprehensive survey of the mechanisms that affect the performance of this reactive barrier technology.
