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Leaching Of Arsenic From Fly Ashes Derived From Six Bituminous Coals Burned In Midwestern Us Electrical Power Plants
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Book Synopsis Leaching of Arsenic from Fly Ashes Derived from Six Bituminous Coals Burned in Midwestern U.S. Electrical Power Plants by : Chandra U. Shekar
Download or read book Leaching of Arsenic from Fly Ashes Derived from Six Bituminous Coals Burned in Midwestern U.S. Electrical Power Plants written by Chandra U. Shekar and published by . This book was released on 1993 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Masters Theses in the Pure and Applied Sciences by : Wade H. Shafer
Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS)* at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dis semination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the though that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volumes were handled by an international publishing house to assure improved service and broader dissemi nation. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 37 (thesis year 1992) a total of 12,549 thesis titles from 25 Canadian and 153 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this impor tant annual reference work. While Volume 37 reports theses submitted in 1992, on occasion, certain uni versities do report theses submitted in previous years but not reported at the time.
Book Synopsis Leaching of Arsenic and Selenium from Fly Ash in the Simulated Field Systems by : Lenin P. Kasthuri
Download or read book Leaching of Arsenic and Selenium from Fly Ash in the Simulated Field Systems written by Lenin P. Kasthuri and published by . This book was released on 2006 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Fly ash accounts for nearly 60% of coal combustion products produced in the United States. Although fly ash is beneficially used in the cement and concrete industries, in waste stabilization, and as a structural fill, about 60% is disposed in landfills or ponds. Trace elements of major environmental concern such as As, Se, Hg, Cr, Cd, Ni, Pb, Cu, Co etc end up on fly ash particles as a result of coal combustion, which may be potentially released to the environment. For utilization purposes, fly ash is classified as class C or class F, depending primarily on its Si+Al+Fe content. The westernsub-bituminousminous coal typically produces class C fly ash, which is also higher in calcium than class F fly ash typically produced from eastern bituminous coal. Due to the differences in ash composition, the leaching behavior of trace elements varies between different types of fly ashes. In addition, activated carbon and ammonia may be used in power plants to control mercury and NOx emission, which also may affect trace element leaching. This study focused on the leaching potential of two major oxyanions of concern, arsenic and selenium, from different fly ashes under simulated field conditions. The results indicated that As and Se, which occur primarily as anionic species in water, were less leachable from the class C ash compared to the class F ash, at least partially due to the higher calcium content in the class C ash. Results also indicated that the mixing of class C ash and class F ash can significantly reduce the leaching of arsenic compared to the Class F ash alone. Activated carbon and ammonia based technologies do not seem to change the leaching characteristics of both arsenic and selenium from fly ash under natural conditions"--Abstract, leaf iv.
Book Synopsis Leaching Characteristics of Inorganic Contaminants from Coal Fly Ash by : Tingzhi Su
Download or read book Leaching Characteristics of Inorganic Contaminants from Coal Fly Ash written by Tingzhi Su and published by . This book was released on 2011 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Leaching of trace elements raises environmental concerns in coal fly ash disposal and reuse. US EPA is in the process of creating the first national rule on coal ash management. However, due to the complexity of coal fly ash composition, the leaching characteristics of trace elements are not well understood. Meanwhile, driven by the tightening emission regulations, new types of coal fly ashes are continuously generated as a result of the technological evolution at coal energy industry. The changing landscape highlights the needs for a comprehensive database to assess the leaching characteristics of different types of coal fly ashes, evaluation of the emission control technology on the ashes produced in the power industry, a practical method to predict the leachability of trace contaminants, and effective methods to remediate inorganic contaminants in fly ash. This study investigated the leaching of a group of concerned inorganic contaminants from different types of fly ashes, and assessed the impact of trona inject for SO2 emission control at coal combustion plants on the fly ash produced. The results showed that trona injection greatly changed the fly ash physical and chemical composition, and significantly enhanced the leaching characteristics of oxyanionic trace elements, especially arsenic (As) and selenium (Se). A protocol was developed to quantify the availability and stability of As and Se in raw bituminous fly ash under various field conditions. The effectiveness of EDT A-washing in remediating fly ash was studied, and the results demonstrated promising application of EDT A in removing toxic trace elements, including As and Se, from low-Ca coal fly ashes"--Abstract, leaf iv.
Book Synopsis Characteristics of a Coal Fly Ash Subjected to Additional Processing by : Christopher W. Swan
Download or read book Characteristics of a Coal Fly Ash Subjected to Additional Processing written by Christopher W. Swan and published by . This book was released on 2011 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents the results of a study of the physical and environmental properties of pre- and post-processed fly ashes (termed Raw and Processed fly ashes, respectively). The ashes were collected from a coal-fired power plant in the northeastern U.S. which utilizes a carbon burn-out unit (CBO) to prepare the fly ash for concrete and other construction applications. Measured physical properties included carbon contents via loss-on-ignition (LOI), specific gravities, gradation analyses, and scanning electron microscopy (SEM). In addition, total and leachable concentrations of lead, selenium, and arsenic were determined. Leachable concentrations were determined for leaching solution pHs varying between 1.5 and 11.5. When compared to Processed fly ash, Raw fly ashes had an expectedly higher LOI (approximately 2% versus 6% carbon content, respectively) and lower specific gravity (2.37 versus 2.18, respectively). Although the total metal content of the fly ashes was similar, leachable metal concentrations were notably higher for the Processed fly ash over the full range of leaching solution pHs evaluated. The test results indicate that the CBO process, at times necessary to create usable fly ash, can result in fly ashes with notably altered physiochemical properties that lead to higher leachable contaminant concentrations.
Book Synopsis Chemical Stabilization of Coal Fly Ash for Simultaneous Suppressing of As, B, and Se Leaching by : Sri Hartuti
Download or read book Chemical Stabilization of Coal Fly Ash for Simultaneous Suppressing of As, B, and Se Leaching written by Sri Hartuti and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The discard of coal fly ash produced from the combustion of pulverized coal in a coal-fired boiler of thermal power plants has led to environmental concerns. Due to the interaction of fly ash particles with weathering and hydrological processes, the rainfall leaches out toxic elements in coal fly ash from the ash heaps. This situation has been pointed out as a potential contamination of soil, surface, and groundwater. In this chapter, the available fly ash treatment techniques to minimize future release of toxic trace elements (arsenic, boron, and selenium) have been documented, and the recent investigations dealing with leaching suppression effect of arsenic, boron, and selenium from coal fly ash have been reviewed. The leaching characteristics of arsenic, boron, and selenium are discussed, and a simple and low-cost leaching control method is presented in the context of treating the fly ash through chemical stabilization technique using additives containing high levels of calcium. Experimental results described in this chapter show the chemical stabilization technique utilizing Ca-containing additives is an effective technique for simultaneous suppressing of As, B, and Se leaching from coal fly ash.
Download or read book Master's Theses Directories written by and published by . This book was released on 1994 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Education, arts and social sciences, natural and technical sciences in the United States and Canada".
Book Synopsis Coal Fly Ash Beneficiation by : Segun Akinyemi
Download or read book Coal Fly Ash Beneficiation written by Segun Akinyemi and published by BoD – Books on Demand. This book was released on 2018-01-31 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present book deals with various, very significant topics of coal fly ash beneficiation, such as treatment of acid mine drainage with coal fly ash, toxic metal adsorption using coal fly ash, recovery of metals from coal fly ash and phytoreclamation of abandoned acid mine drainage site after treatment with coal fly ash, the status of research in coal fly ash utilization and applications and some other related topics in this growing and increasingly important research area. Overall, coal fly ash beneficiation has come to assume an important role in most areas of waste management research today. Continued growth and emphasis on scientific research is expected in all areas of waste management and conversion of waste to wealth technologies.
Book Synopsis Leaching Characteristics of Arsenic from Aged Alkaline Coal Fly Ash by : Pratibha Naithani
Download or read book Leaching Characteristics of Arsenic from Aged Alkaline Coal Fly Ash written by Pratibha Naithani and published by . This book was released on 2007 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fly Ash Utilization by : Arnold Marshall Lansche
Download or read book Fly Ash Utilization written by Arnold Marshall Lansche and published by . This book was released on 1967 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes and discusses present-day leaching technology employed to recover copper from low-grade mine and dump materials derived from the exploitation of copper ore deposits in the Western United States. Illustrations of the integral parts of the leaching, precipitation, and recovery operations at several copper-producing companies are presented. Schematic drawings are included to present typical flowsheets of leaching and precipitation operations. Operational problems common to most copper leaching and precipitation plants are discussed. areas of present and future research to improve leaching techniques are cited.
Book Synopsis A Comparative Field and Laboratory Study of Fly Ash Leaching Characteristics by : D. J. R. Dodd
Download or read book A Comparative Field and Laboratory Study of Fly Ash Leaching Characteristics written by D. J. R. Dodd and published by . This book was released on 1981 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Leachate Control of Coal Fly Ash Through Hydrophobicity and Contaminant Fixation by : Jenet Truelsen Hattaway
Download or read book Leachate Control of Coal Fly Ash Through Hydrophobicity and Contaminant Fixation written by Jenet Truelsen Hattaway and published by . This book was released on 2014 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this research study was to determine whether the leaching of metals from coal fly ash can be reduced or eliminated by increasing hydrophobicity (water repellency) or contaminant fixation in fly ash. A secondary goal was determining how the newer EPA leaching tests compare with the Resource Conservation and Recovery Act (RCRA) specified Toxicity Characteristic Leaching Procedure (TCLP). Coal fly ash (CFA) is a product of coal combustion that is captured by air pollution control devices. The consistency and physical properties of fly ash make it a valuable substitute for a number of construction components such as road base, structural fill and as a partial substitute for cement in concrete mixtures. However, concerns that metals present in fly ash may leach and migrate into water supplies impacted the expanded use of coal fly ash. Millions of tons of fly ash are produced each year during electric power production and only 42% is recycled, primarily into concrete. Leaching occurs when water in contact with a solid material causes the solid to release some of its constituents into the contacting water. If water can be prevented from contacting the fly ash, leaching should not occur. Organosilanes (OS) are a family of chemicals that facilitate covalent bonding and render surfaces water repellent. Two different OS products were tested in this study as a method of imparting hydrophobicity to the fly ash. A contaminant fixation product, to sequester the metals in chemical bonds, was the third treatment tested. Treated and untreated coal fly ash was tested according to four different leaching procedures, methods 1311, 1313, 1314 and 1316 of the U.S. Environmental Protection Agency's "Test Methods for Evaluating Solid Waste, Physical/Chemical Methods" also known as SW-846. Method 1311 (TCLP) is the established leaching test used for regulatory screening to determine toxicity. Method 1311 was compared with Methods 1313, 1314, and 1316. The leachates were analyzed for seventeen metals: Aluminum, Arsenic, Barium, Boron, Cadmium, Calcium, Chromium, Copper, Iron, Lead, Magnesium, Manganese, Molybdenum, Selenium, Silicon, Vanadium, and Zinc. While no treatment tested prevented leachability of all constituents in this battery of leaching tests, different treatments were effective in reducing leaching of different constituents. For example, one OS treatment reduced arsenic concentrations 24% to 72% within the pH range of 5.5 to 10.5. This suggests that a chemical treatment may be developed that can prevent or reduce leachability. Analysis indicates that treatment efficacy varies with pH, test method and the metal analyzed. The extent to which these leaching results accurately reflect likely field performance remains unclear. Methods 1313, 1314 and 1316 provide more information about the leaching behavior of a material and may provide more appropriate regulatory guidance than Method 1311 (TCLP) if used with applicable environmental conditions rather than a blanket "worse case" scenario. The comparison also highlighted that Method 1311 (TCLP) may under report leaching concentrations for such elements as arsenic, selenium, and molybdenum when the material has a high natural pH.
Book Synopsis A Study of Midwestern Bituminous Coal Fly Ash by : Joseph John Bruns
Download or read book A Study of Midwestern Bituminous Coal Fly Ash written by Joseph John Bruns and published by . This book was released on 1980 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Recovery, Reuse and Recycling Potential of of Coal Fly Ash by : Pravin Nalawade
Download or read book Recovery, Reuse and Recycling Potential of of Coal Fly Ash written by Pravin Nalawade and published by LAP Lambert Academic Publishing. This book was released on 2014-11-28 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electricity production form coal based power plant is the cheapest and technologically suitable method. The use of coal in these power plant results in to production of fly ash. The extent of production of fly ash depends upon type and quality of coal used like lignite, anthracite bituminous and sub bituminous coal. The fly ash spreads around thermal power plant. The fly ash also dispersed off in the form of slurry or sludge, in the near by area of Thermal Power Plant i.e. at disposal sites. The soil becomes infertile and may convert in to barren land due to leaching . The constituents of fly ash after disposal may pollute the water. The severity of pollution may remains high and uncured for years to come. It is necessary to find the proper solution to fly ash problem. The hues quantity of waste fly ash can be reuse as a resource and row material in various process by studding its recycling and reuse potential. The proposed work will be help full for solving fly ash problem and development of recover, reuse and recycle techniques may identify the fly ash is a value added product and not a waste
Book Synopsis The Effect of PH on the Leaching of Selected Elements from Coal-fired Power Plant Fly Ash by : Stephen M. Smith
Download or read book The Effect of PH on the Leaching of Selected Elements from Coal-fired Power Plant Fly Ash written by Stephen M. Smith and published by . This book was released on 1987 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Leaching Behavior of Arsenic, Selenium and Other Trace Elements in Coal Fly Ash by : Tian Wang
Download or read book The Leaching Behavior of Arsenic, Selenium and Other Trace Elements in Coal Fly Ash written by Tian Wang and published by . This book was released on 2007 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The goals of this study are four fold, they are: (1) to investigate the leaching behavior of arsenic and selenium from fly ash as well as their affecting factors; (2) to analyze the speciation of arsenic and selenium in fly ash leachate; (3) to develop a modeling approach to quantify the availability and stability of trace cationic elements in fly ash; (4) to apply this model to describe the leaching/adsorption behavior of arsenic and selenium on fly ash, as well as the calcium effect on arsenic (V) adsorption process"--Abstract, leaf iv
Book Synopsis Leaching of Fly Ash Particulate Matter in MEA Solutions and Its Relevance to the CO2 Capture Process with Flue Gas of Coal-fired Power Plants by : Bernd Schallert
Download or read book Leaching of Fly Ash Particulate Matter in MEA Solutions and Its Relevance to the CO2 Capture Process with Flue Gas of Coal-fired Power Plants written by Bernd Schallert and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
