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Rates Of Trichloroethylene Reduction In Passivated Zero Valent Iron Upon Application Of Low Level Direct Current
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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 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 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 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 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 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 Nanoscale Zerovalent Iron Particles for Environmental Restoration by : Tanapon Phenrat
Download or read book Nanoscale Zerovalent Iron Particles for Environmental Restoration written by Tanapon Phenrat and published by Springer. This book was released on 2019-01-31 with total page 611 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first complete edited volume devoted to providing comprehensive and state-of-the art descriptions of science principles and pilot- and field-scaled engineering applications of nanoscale zerovalent iron particles (NZVI) for soil and groundwater remediation. Although several books on environmental nanotechnology contain chapters of NZVI for environmental remediation (Wiesner and Bottero (2007); Geiger and Carvalho-Knighton (2009); Diallo et al. (2009); Ram et al. (2011)), none of them include a comprehensive treatment of the fundamental and applied aspects of NZVI applications. Most devote a chapter or two discussing a contemporary aspect of NZVI. In addition, environmental nanotechnology has a broad audience including environmental engineers and scientists, geochemists, material scientists, physicists, chemists, biologists, ecologists and toxicologists. None of the current books contain enough background material for such multidisciplinary readers, making it difficult for a graduate student or even an experienced researcher or environmental remediation practitioner new to nanotechnology to catch up with the massive, undigested literature. This prohibits the reader from gaining a complete understanding of NZVI science and technology. In this volume, the sixteen chapters are based on more than two decades of laboratory research and development and field-scaled demonstrations of NZVI implementation. The authors of each chapter are leading researchers and/or practitioners in NZVI technology. This book aims to be an important resource for all levels of audiences, i.e. graduate students, experienced environmental and nanotechnology researchers, and practitioners evaluating environmental remediation, as it is designed to involve everything from basic to advanced concepts.
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 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 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 Degradation of Trichloroethylene Using Iron, Bimetals and Trimetals by : Wanchun Yuan
Download or read book Degradation of Trichloroethylene Using Iron, Bimetals and Trimetals written by Wanchun Yuan and published by . This book was released on 2000 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: A set of non-chlorinated hydrocarbons consisting Of C3 to C6 alkanes and alkenes was also observed. In the presence of various anions, competition between N03− and TCE was observed for zero-valent iron, bimetals and trimetals, especially when the concentration of N03− was higher than 200 mg/L. In the presence Of S042− and PO43−, there appeared to be an increase in TCE degradation rate using Fe/Cu/Ni but no significant effect using Fe/Ni, Fe/Cu and Fe. The presence Of HC03− did not affect the degradation rates of TCE dechlorination with zero-valent, bimetals and trimetals. Except in the 200 mg/L N03− solution, the degradation of TCE in the HC03−, SO42−, PO43−, and N03− was faster in Fe/Cu/Ni followed by Fe/Ni, Fe/Cu, and Fe. This study indicated that plating copper and nickel onto zero-valent iron will enhance TCE degradation rate constants by approximately one to two orders of magnitude.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2002 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reduction of Perchlorate by Zero Valent Iron by :
Download or read book Reduction of Perchlorate by Zero Valent Iron written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reduction of Aqueous Perchlorethylene by Zero-valent Iron/tin Mixtures by : Sherman M. Ponder
Download or read book Reduction of Aqueous Perchlorethylene by Zero-valent Iron/tin Mixtures written by Sherman M. Ponder and published by . This book was released on 1996 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Aquatic Redox Chemistry by : Paul Tratnyek
Download or read book Aquatic Redox Chemistry written by Paul Tratnyek and published by OUP USA. This book was released on 2012-06-14 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides a comprehensive overview of aquatic redox chemistry through chapters contributed by many of the leading investigators in the field.