Download or read book Comparison of Alternative Hydrogen Donors for Anaerobic Reductive Dechlorination of Tetrachloroethene written by Donna Elaine Fennell and published by . This book was released on 1998 with total page 802 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comparison of Alternative Hydrogen Donors for Anaerobic Reductive Dechlorination of Tetrachlorothene written by Donna Fennell and published by . This book was released on 1998 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Selective delivery of H2 to a tetrachloroethene (PCE) dechlorinator was investigated and modeled. H2 was delivered using donors lactate, ethanol (EtOH), butyrate, or propionate SUBSTRATES WHOSE FERMENTATION TO H2 is exergonic under H2 partial pressures (ceilings) of less than 1, 0.1, l0 (exp -3.5), and 10 (exp -4.4) atm, respectively. Recent studies of H2 use in reductive dechlorination show that dechlorinators have an affinity for H2 at least an order of magnitude greater than that of hydrogenotrophic methanogens. Slowly fermented substrates producing lower H2 levels may be more effective and persistent "selective" stimulators of dechlorination than rapidly fermented substrates producing higher H2 levels. Separate, semicontinously operated cultures were enriched with each of the donors. Long-term, all donors equally stimulated the dechlorination of PCE to vinyl chloride and ethene; however, stimulation of methanogenesis differed (EtOH> lactate> butyrate> propionate). During short-term tests, patterns of donor fermentation and H2 production and consumption were significantly different for different donors. When fed amounts stoichiometrically sufficient to completely dechlorinate PCE, half the H2 released during EtOH fermentation was used methanogenically with the remainder channeled to incomplete dechlorination; however, only 1% of the H2 released during propionate fermentation was used methanogenically and the remainder was used for complete dechlorination. A comprehensive model using Michaelis-Menten-type kinetics incorporating H2 thresholds and thermodynamic limitations on donor fermentations was formulated. Mixed-culture behavior under a variety of conditions was fit well by the model.

Download or read book Microbially Mediated Reductive Dechlorination of Dichlorobenzene written by Anne Sandra Quistorff and published by . This book was released on 1999 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: The microbially mediated reductive dechlorination of 1,2-, 1,3-, and 1,4-dichlorobenzene (DCB) was studied using site material from eight different locations. The soil and groundwater from each site were anaerobically added to multiple serum bottles and mixed. All three DCB isomers were added to each serum bottle to a total nominal concentration of 30 micro-mole per liter for some microcosms and 600 micro-mole per liter for other microcosms. In addition, electron donor in the form of yeast extract (100 mg/L) was added to some microcosms and some microcosms were autoclaved and served as abiotic controls. The microcosms were then incubated, inverted, in the dark at 24 deg C and periodically monitored by head space injections into a gas chromatograph system. Reductive dechlorination of the DCB isomers was noted in microcosms from five of the eight locations and ranged from 10% to nearly 100%. Additionally, in all the positive microcosms, dechlorination proceeded independent of whether yeast extract was added. Due to the rapid onset of dechlorination in some of the microcosms, it is likely that DCB dechlorination is occurring on site. Generally, 1,2-DCB was the most readily degraded DCB isomer. 1,3-DCB was the next most readily degraded isomer, distantly followed by 1,4-DCB.

Download or read book Proceedings of the 51st Purdue Industrial Waste Conference1996 Conference written by Purdue Research Foun and published by CRC Press. This book was released on 1997-05-01 with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers presented at the 51st Purdue Industrial Waste Conference have been divided into the following sections: pollution prevention site remediation physical and chemical processes odor and VOC control solidification, foundry, and combustion residues biological processes respirometry and effluent toxicity industrial waste case histories Each chapter contains a multitude of figures and tables illustrating the concepts discussed as well as extensive references for further study.

Download or read book Natural Attenuation of Hazardous Wastes written by Rao Y. Surampalli and published by ASCE Publications. This book was released on 2004-01-01 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sponsored by the Natural Attenuation Task Committee of the Environmental and Multi-Media Council of the Environmental and Water Resources Institute of ASCE. This report provides the regulatory framework, scientific and engineering principles, and applications of natural attenuation for the remediation of contaminated sites. Natural attenuation is a process that relies on the natural assimilative capacity of a site to reduce or stabilize contaminates to desirable levels. It is becoming an increasingly popular, cost-effective remedial alternative for many contaminated sites. The report describes in detail sites contaminated with petroleum hydrocarbons and MTBE, chlorinated solvents, polycyclic aromatic hydrocarbons, metals, and radioactive wastes. Topics include: Ømajor pollutants; Øextensive review of literature; Øexamples of applications of natural attenuation; Øsite characterization and monitoring requirements and procedures; and Øbasic scientific principles on physical, chemical, and biological processes. Environmental engineers and scientists will find this book full of information on basic principles to summaries of natural attenuation applications.

Download or read book Methodology for Estimating Times of Remediation Associated with Monitored Natural Attenuation written by and published by . This book was released on 2003 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comprehensive Biotechnology written by and published by Elsevier. This book was released on 2019-07-17 with total page 4876 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive Biotechnology, Third Edition, Six Volume Set unifies, in a single source, a huge amount of information in this growing field. The book covers scientific fundamentals, along with engineering considerations and applications in industry, agriculture, medicine, the environment and socio-economics, including the related government regulatory overviews. This new edition builds on the solid basis provided by previous editions, incorporating all recent advances in the field since the second edition was published in 2011. Offers researchers a one-stop shop for information on the subject of biotechnology Provides in-depth treatment of relevant topics from recognized authorities, including the contributions of a Nobel laureate Presents the perspective of researchers in different fields, such as biochemistry, agriculture, engineering, biomedicine and environmental science

Download or read book Water resources Investigations Report written by and published by . This book was released on 2003 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Characterization of a Dehalococcoides containing Tetrachloroethene Dechlorinating Enrichment Culture written by Brendan Joseph Lazar and published by . This book was released on 2006 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Engineered Approaches for in Situ Bioremediation of Chlorinated Solvent Contamination written by Andrea Leeson and published by . This book was released on 1999 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sites contaminated with chlorinated compounds pose health risks and are challenging and often expensive to treat in the field. This volume brings together the most up-to-date laboratory findings and the latest full-scale results from bioremediation efforts at actual field sites. Engineering approaches discussed include biobarriers, cometabolism, bioaugmentation, in situ oxidation, Fenton's Reagent, in situ bioremediation, and more.

Download or read book Natural and Enhanced Remediation Systems written by Suthan S. Suthersan and published by CRC Press. This book was released on 2001-08-06 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building on the success of bioremediation and phytoremediation technologies, Natural and Enhanced Remediation Systems explores remediation techniques that use the beneficial effects provided by Mother Nature. Written by a leader in the industry, the book provides state-of-the-art information on natural and enhanced remediation techniques such as mo

Download or read book Bioremediation of Chlorinated Solvents written by Robert E. Hinchee and published by . This book was released on 1995 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil and groundwater contamination stemming from the release of various chlorinated compounds into the environment is a significant and difficult site remediation challenge. The articles in this collection discuss the use of aerobic and anaerobic biological degradation to dehalogenate sites contaminated with pesticides and chlorinated solvents such as trichloroethylene, tetrachloroethene, tetrachloromethene, perchloroethylene, carbon tetrachloride, pentachlorophenol, and chlorinated benzene. Bench- and field-scale studies of the biological processes associated with in situ dechlorination of soil and aquifers are described. Discussed are the uses of microcosm studies and numerical simulation of dechlorination to manage system operation. Site characteristics (e.g., hydraulic properties, temperature, nitrogen availability) and their effect on the stability of the methanotrophic community are examined. Methods discussed include the use of air venting, alternative electron donors, biofilm reactors, surfactants, municipal digester sludge, iron enhancement, and sulfate reduction to improve conditions for the microbial consortia that effect dechlorination.

Download or read book Novel Insights into Algal Biology and Biotechnology written by Yuval Kaye and published by Frontiers Media SA. This book was released on 2019-05-23 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Organohalide Respiration New Findings in Metabolic Mechanisms and Bioremediation Applications written by Shanquan Wang and published by Frontiers Media SA. This book was released on 2019-05-21 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microbial reductive dehalogenation mediated by organohalide-respiring bacteria plays a critical role in the natural halogen cycle, representing a promising solution for removal of organohalide pollutants. This Research Topic presents many of the more recent advances that have been made in this area. Authors from leading research groups contributed to this eBook, and provided mechanistic insights into organohalide respiration, as well as their bioremediation implications, at molecular, cellular, community and system levels.

Download or read book Current Developments in Biotechnology and Bioengineering written by Jonathan W-C Wong and published by Elsevier. This book was released on 2016-09-19 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: Current Developments in Biotechnology and Bioengineering: Solid Waste Management provides extensive coverage of new developments, state-of-the-art technologies, and potential future trends, reviewing the latest innovative developments in environmental biotechnology and bioengineering as they pertain to solid wastes, also revealing current research priority areas in solid waste treatment and management. The fate of solid wastes can be divided into three major areas, recycling, energy recovery, and safe disposal. From this foundation, the book covers such key areas as biotechnological production of value added products from solid waste, bioenergy production from various organic solid wastes, and biotechnological solutions for safe, environmentally-friendly treatment and disposal. The state of the art situation, potential advantages, and limitations are discussed, along with proposed strategies on how to overcome limitations. - Reviews available bioprocesses for the production of bioproducts from solid waste - Outlines processes for the production of energy from solid waste using biochemical conversion processes - Lists various environmentally friendly treatments of solid waste and its safe disposal

Download or read book Innovative Approaches to the On Site Assessment and Remediation of Contaminated Sites written by Danny Reible and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: 2 DANNY D. REIBLEI AND KATERINA DEMNEROVA 1 Hazardous Substance Research Center/South and Southwest, Louisiana State University, Baton Rouge, LA 70803 2 Department of Biochemistry and Microbiology, Institute of Chemical Technology, Prague, Czech Republic On May 24, 2001, a total of 102 students and lecturers participated in an Advanced Study Institute (ASI) sponsored by the North Atlantic Treaty Organization (NATO) under our direction. The Institute was focused on in situ and onsite management of contaminated sites. The objective of the Institute was to balance state of the art science with techniques for field application of a variety of technologies for in situ assessment and remediation of contaminated sites. Many of the lecturers were drawn from the ranks of the Hazardous Substance Research Centers, multi-university consortia that have been funded by the US Environmental Protection Agency to conduct research and technology transfer designed to promote risk-based management and control of hazardous substances for the nation. The Centers have made special contributions to the areas of in situ and onsite assessment and remediation of contaminated sites. Such approaches have the potential for being significantly less expensive than other assessment and remediation approaches while maintaining accuracy and effectiveness. Cost-effective remedial and management approaches that are also effective in minimizing exposure and risk to human health and the environment are a critical need throughout the world but particularly in Eastern Europe and the former Soviet Union where resources that can be devoted to environmental cleanup are especially limited.

Download or read book Transport and Transformations of Chlorinated solvent Contamination in a Saprolite and Fractured Rock Aquifer Near a Former Wastewater treatment Plant Greenville South Carolina written by and published by . This book was released on 1997 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: