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Author : Lisa M. Imbrogno
Publisher :
ISBN 13 :
Total Pages : 168 pages
Book Rating : 4.:/5 (379 download)
Download or read book Trichloroethylene Degradation in the Presence of Soil written by Lisa M. Imbrogno and published by . This book was released on 1997 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Peiliang Shen
Publisher :
ISBN 13 :
Total Pages : 304 pages
Book Rating : 4.:/5 (374 download)
Download or read book Enhanced Degradation of Trichloroethylene in the Presence of Metallic Iron and Soil/smectites written by Peiliang Shen and published by . This book was released on 1997 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mark Edmund Fuller
Publisher :
ISBN 13 :
Total Pages : 402 pages
Book Rating : 4.:/5 (55 download)
Download or read book The Effects of Trichloroethylene (TCE) and Toluene on Soil Microbial Community Structure and Function written by Mark Edmund Fuller and published by . This book was released on 1995 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jed Costanza
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (631 download)
Download or read book Degradation of Tetrachloroethylene and Trichloroethylene Under Thermal Remediation Conditions written by Jed Costanza and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermal remediation involves heating subsurface environments and collecting fluids in order to recover contaminants such as tetrachloroethylene (PCE) and trichloroethylene (TCE). While increasing subsurface temperature can lead to changes in the distribution of contaminants between the solid, liquid, and gas phases, there is also an increased potential for PCE and TCE to degrade. This work was performed to determine the rate of PCE and TCE degradation and products formed in laboratory-scale experiments designed to simulate thermal remediation conditions. The conditions during transport of gas-phase TCE were simulated using flow-through experiments in the temperature range from 60 to 800C. Degradation of TCE was not evident at temperatures of less than 240C; however, chloroacetic acids, which comprised less than 0.1% of the influent TCE on a carbon basis, were detected. At temperatures greater than 300C, TCE readily degraded where the identities of the degradation products were a function of oxygen and water content. With oxygen present, TCE degraded to form CO, phosgene, CO2 with minor amounts of hexachloroethane, PCE, and carbon tetrachloride. Increasing the amount of water vapor was found to decrease the amount of TCE degraded. Vapor recovery systems used during thermal treatments are anticipated to capture these TCE degradation products. However, the amount of missing carbon ... in experiments completed at 800C makes the prospect of recovering all TCE degradation products doubtful. Experiments were conducted using hermetically sealed ampules to simulate heating dissolved phase PCE and TCE over periods of up to 75 days. At 120C, the first-order TCE degradation half-life was 330 days and the degradation products included CO and CO2, glycolate, formate, and chloride. The rate of TCE disappearance was increased with the addition of 1% (wt.) goethite, which suggests that the presence of iron bearing soil minerals can increase rates of TCE degradation during thermal treatment. In contaminated field samples, TCE was found to degrade to form cis-1,2-dichloroethylene at 95C coincident with the formation of hydrogen gas. Degradation of PCE was not evident in field samples or in deionized water and is not expected to degrade during thermal remediation at temperatures below 95C.
Author : Eugene Edward Dammel
Publisher :
ISBN 13 :
Total Pages : 338 pages
Book Rating : 4.:/5 (56 download)
Download or read book Trichloroethylene Degradation by a Nitrifying Consortium in Soil written by Eugene Edward Dammel and published by . This book was released on 1997 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Influence of Soil Organic Matter on the Fate of Trichloroethylene in Soil written by and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kumar S. Kathinokkula
Publisher :
ISBN 13 :
Total Pages : 99 pages
Book Rating : 4.:/5 (51 download)
Download or read book Effect of Metals and Nutrients on Trichloroethylene Degradation by Soil Cultures Stimulated by Methane written by Kumar S. Kathinokkula and published by . This book was released on 2002 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Steven G. Hansen
Publisher :
ISBN 13 :
Total Pages : 162 pages
Book Rating : 4.:/5 (282 download)
Download or read book Measuring the Kinetics of Trichloroethylene Degradation by Methanotrophic Bacteria in Differential Soil Bioreactors written by Steven G. Hansen and published by . This book was released on 1992 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sasikarn Chuahom
Publisher :
ISBN 13 :
Total Pages : 216 pages
Book Rating : 4.:/5 (951 download)
Download or read book Trichloroethylene Contaminated Soil Clean-up Using Surfactant-based Separation Technology and Bioremediation written by Sasikarn Chuahom and published by . This book was released on 2006 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surfactant-based separation technology and bioremediation was integrated to enhance the removal of trichloroethylene (TCE) from soil. In this system, cloud point extraction by non-ionic surfactant was conducted to separate high amount of TCE into the surfactant-rich phase and then bioremediation was integrated into the system by adding bacteria to co-metabolize the remaining TCE. Six surfactant systems including SURFONIC TDA-5, SURFONIC TDA-6, SURFONIC L24-7, NEODOL 91-5, NEODOL 91-6 without electrolyte addition and DTAB/DOWFAX (2:1 molar ratio) with 0.8 M NaCI were studied. These surfactants induced a phase separation with the surfactant-rich phase presented on top of the solution thus preventing the accumulation of surfactant on soil particles. The results found that SURFONIC TDA-6, SURFONIC L24-7, an NEODOL 91-6 did not inhibit TCE degradability of either Rhodococcus sp. L4 or Phodococcus sp. P3 bacteria while others killed the bacteria. Rhodococcus sp. L4 degraded TCE effectively in the presence of SURFONIC TDA-6, in which more than 58% of 10 ppm TCE was reduced within 24 hours compared to only 30% of TCE removal in control treatment (without the bacteria), SURFONIC TDA-6 was then selected for determining the optimal condition for TCE extraction consisting of equilibrium time, contact time between surfactant solution and soil and initial concentration of surfactant. The optimal condition for TCE extraction by cloud point technique were as followed; 72 hours of equilibrium time, 1 lour of contact time between soil and surfactant solution, and 70 mM of initial concentration of surfactant. These acquired conditions were later applied to compare the effectiveness of three TCE treatment processes including: (1) bioremediation, (2) surfactant extraction and (3) integrated technique. TCE removal efficiency was determined from the remaining TCE concentration in soil after treatment. The TCE removal efficiency of 100 ppm TCE contaminated soil by bioremediation, surfactant extraction and integrated technique were about 74%, 74% and 94%, respectively. Morever, TCE was mineralized as showed by the increase of chloride ions after remediation by bioremediation and integrated technique. When increased the amount of initial TCE to 300 ppm, the removal efficiency of the integrated technique was about 94% which was around 30% higher than either technique alone. The result found that soil remediation by the integrated technique had the highest TCE removal efficiency.
Author : Thomas Joseph Walker
Publisher :
ISBN 13 :
Total Pages : 350 pages
Book Rating : 4.:/5 (227 download)
Download or read book FATE AND DISPOSITION OF TRICHLOROETHYLENE IN SURFACE SOILS. written by Thomas Joseph Walker and published by . This book was released on 1984 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: Trichloroethylene (TCE) is a widely detected contaminant in groundwater. This study investigated fate of TCE in two similar soils with differing organic carbon contents. TCE was applied to soil columns in one 5 or 10 m1 quantity, then eluted with 50 or 100 m1 of water/day. The 1.4% organic carbon soil retarded TCE elution more than did the 0.53% soil. Biodegradation of TCE in the soils, based on effluent TCE and chlorides, was not enhanced by addition of ammonia. Warburg studies showed TCE inhibited biological activity in unacclimated soil. Acclimated soil of both types from 2.5 and 15 inch depths showed degradation of TCE at 55 mg/1 but not 110 or 550 mg/1. No evidence of cis or trans-1,2-dichloroethylene was found in column effluents. Degradation (biological and abiotic) accounted for 0.3% or less of TCE. Volatilization accounted for 15.6-32.8% of TCE applied.
Author : Earl III. Benjamin
Publisher :
ISBN 13 :
Total Pages : 266 pages
Book Rating : 4.:/5 (484 download)
Download or read book The Effect of Metallic Ions on Trichloroethylene Degradation in Soils written by Earl III. Benjamin and published by . This book was released on 1999 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 340 pages
Book Rating : 4.3/5 (91 download)
Download or read book Toxicological Profile for Trichloroethylene written by and published by . This book was released on 1997 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (684 download)
Download or read book Degradation of Trichloroethylene (TCE) and Polychlorinated Biphenyls (PCBs) by Fe and Fe-Pd Bimetals in the Presence of Surfactants and Cosolvents written by and published by . This book was released on 1997 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surfactants and cosolvents are being used to enhance the removal of dense non-aqueous phase liquids (DNAPL) such as trichloroethylene (TCE) and polychlorinated biphenyls (PCBS) from contaminated soils. However, the waste surfactant solution containing TCE and PCBs must be treated before it can be disposed. This study evaluated the use of zero-valence iron and palladized iron fillings on the dechlorination of TCE and a PCB congener in a dihexylsulfosuccinate surfactant solution. Batch experimental results indicated that TCE can be rapidly degraded by palladized iron filings with a half-life of 27.4 min. PCB was degraded at a slower rate than TCE with a half-life ranging from 100 min to 500 min as the concentration of surfactant increased. In column flow-through experiments, both TCE and PCBs degrade at an enhanced rate with a half-life about 1.5 and 6 min because of an increased solid to solution ratio in the column than in the batch experiments. Results of this work suggest that Fe-Pd filings may be potentially applicable for ex-situ treatment of TCE and PCBs in the surfactant solutions that are generated during surfactant washing of the contaminated soils.
Author : Der-Yi Mu
Publisher :
ISBN 13 :
Total Pages : 184 pages
Book Rating : 4.:/5 (53 download)
Download or read book Effect of Acclimation on Biodegradation of Trichloroethylene and Toluene by Soil Microbial Populations written by Der-Yi Mu and published by . This book was released on 1993 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher : ScholarlyEditions
ISBN 13 : 1464997691
Total Pages : 215 pages
Book Rating : 4.4/5 (649 download)
Download or read book Chlorinated Hydrocarbons—Advances in Research and Application: 2012 Edition written by and published by ScholarlyEditions. This book was released on 2012-12-26 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chlorinated Hydrocarbons—Advances in Research and Application: 2012 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Chlorinated Hydrocarbons. The editors have built Chlorinated Hydrocarbons—Advances in Research and Application: 2012 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Chlorinated Hydrocarbons in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Chlorinated Hydrocarbons—Advances in Research and Application: 2012 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Author : Todd Alan Anderson
Publisher :
ISBN 13 :
Total Pages : 187 pages
Book Rating : 4.:/5 (132 download)
Download or read book Comparative Plant Uptake and Microbial Degradation of Trichloroethylene in the Rhizospheres of Five Plant Species written by Todd Alan Anderson and published by . This book was released on 1994 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jacqueline E. Mohan
Publisher : Academic Press
ISBN 13 : 0128134933
Total Pages : 592 pages
Book Rating : 4.1/5 (281 download)
Download or read book Ecosystem Consequences of Soil Warming written by Jacqueline E. Mohan and published by Academic Press. This book was released on 2019-04-27 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ecosystem Consequences of Soil Warming: Microbes, Vegetation, Fauna and Soil Biogeochemistry focuses on biotic and biogeochemical responses to warmer soils including plant and microbial evolution. It covers various field settings, such as arctic tundra; alpine meadows; temperate, tropical and subalpine forests; drylands; and grassland ecosystems. Information integrates multiple natural science disciplines, providing a holistic, integrative approach that will help readers understand and forecast future planetwide responses to soil warming. Students and educators will find this book informative for understanding biotic and biogeochemical responses to changing climatic conditions. Scientists from a wide range of disciplines, including soil scientists, ecologists, geneticists, as well as molecular, evolutionary and conservation biologists, will find this book a valuable resource in understanding and planning for warmer climate conditions. Emphasizes biological components of soils, plants and microbes that provide linkages to physics and chemistry Brings together chapters written by global scientific experts with interests in communication and education Includes coverage of polar, alpine, tropical, temperate and dryland ecosystems
