Download or read book Effect of Flow Rate on Leaching of Metals from Fly Ash and Stabilized Fly Ash written by Daniel N. Creek and published by . This book was released on 1991 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Leaching of Heavy Metals from Fly Ash Stabilized Soils written by Md Sazzad Bin-Shafique and published by . This book was released on 2002 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Leaching of Heavy Metals from Fly Ash Stabilized Soils Used in Highway Pavements written by Md Sazzad Bin-Shafique and published by . This book was released on 2002 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Immobilization of Heavy Metals from the Strucutural Fill Using Fly Ash written by Manik Chandra Mitra and published by . This book was released on 2013 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: According to ACAA, only 43 percent of the 130.1 million tons of coal ash produced in the US in 2011 was beneficially used (ACAA 2011). Since the fly ash contains hazardous material including heavy metals, the unused fly ashes are dumped in landfill which costs a huge amount of money every year. Although fly ash could be used in many geotechnical applications, such as, structural fill, soil stabilization, fillable fill etc., but the use of fly ash is restricted by environmental regulations due to leaching of hazardous materials possesses a huge threat to the environment. If the hazardous materials, especially the heavy metals could be stabilized, a huge amount of fly ash could be used for beneficial use. This study is focused to immobilize the heavy metals from the fly ash structural fill using relatively low cost triple super phosphate (TSP) and the results are compared with widely used metal stabilization method using chelating agent (EDTA). One Class C and one Class F fly ash were mixed with different dosage of TSP (0%, 2%, 4%, 6%, and 8%) or EDTA (0.2%, 0.4%, 1%, and 2%), and then compacted after adding 15% water to achieve a compacted structural fill. The mixtures were allowed to cure for seven days and then subjected to standard Toxicity Characteristic Leaching Procedure (TCLP). Both TCLP extraction fluids with pH 4.93 and 2.88 were used for the TCLP tests. Additionally, a water leach test (extraction fluid pH = 7) was also conducted using the same solid-liquid ratio to understand the leaching characteristics at different pH of the extraction fluid. The leachates from the leaching tests were subjected to chemical analysis to determine the concentration of metals. For both stabilizers, the leaching of metals showed three distinctive patterns as the stabilizer dosage was increased. Firstly, leaching of some of the metals remained unchanged as the stabilizer content was increased. Secondly, leaching of some of the metals decreased as the stabilizer content was increased, and finally leaching of some of the metals decreased dramatically and went below the detection limit even after using the lowest dosage of the stabilizers. However, the effect of TSP on metal leaching was significantly different than that of EDTA for different metals. As the pH of the extraction fluid decreased, the leaching of metals increased for most of the metals. However, the effect of the stabilizers had the similar effect.
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 350 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 1 957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought 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 con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration 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 36 (thesis year 1991) a total of 11,024 thesis titles from 23 Canadian and 161 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 36 reports theses submitted in 1991, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.
Download or read book Trace Metal Control for Fly Ash Through Attenuation and Solidification written by Gautham Parangusa Das and published by . This book was released on 2004 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this research was to investigate two different approaches for controlling trace metals that leach from coal combustion fly ash. In particular, one part of the research program consisted of a systematic evaluation of an array of sorbents for possible use as permeable reactive material. The second part of the research considered the use of mixtures of lime, fly ash, and flue gas desulfurization material (FGD) to stabilize the ash and reduce leachability. To assess the ability of the additives to attenuate heavy metals, batch and column sorption tests were conducted. The methodology involved screening a wide variety of low cost (e.g., steel byproducts, rubber dust, compost) and innovative materials (e.g., kudzu, biofilm, pondweed) as well as conventional additives (activated carbon and alumina, zeolites) for benchmarking purposes. Promising additives included limestone and steel byproducts. In the case of limestone, batch sorption studies revealed large distribution coefficients (K[subscript]d) of 15,740, 1520 and 540 L/kg, for cadmium, chromium and selenium, respectively. However, subsequent column testing yielded K[subscript]d values less than 10 L/kg, suggesting a kinetic limitation on the reaction mechanism for the flow rates investigated. Solidification was investigated on both laboratory and field-scales, where fly ash blended with varying amounts of lime was subjected to various leach procedures. Leaching results showed that arsenic leached below the reporting limit (10 [mu]g/L) for fly ash alone, while the 0.50% lime amendment increased the leachability to nearly 50 [mu]g/L. There is a threshold level of lime amendment, beneath which may result in an increase in pH and leachability of oxyanions such as arsenic, chromium, and selenium. Sufficient lime must be added to engender the cementitious reactions which are responsible for immobilizing contaminants.
Download or read book Effect of Chemical Treatment of Fly Ash on the Leaching of Metals written by M. Boybay and published by . This book was released on 1984 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation was conducted to determine the ability of chemical treatment to reduce the leaching of metals from fly ash. A further objective was to determine the effect of cofiring refuse-derived fuels with coal on leachate composition. Samples of fly ash were treated with portland cement, chemically pure lime, and phosphoric acid and subjected to a column leaching process. The leachates were composited weekly and analyzed using X-ray fluorescence and atomic absorption spectrometry.
Download or read book Evaluation of Metals Leaching from Gray Iron Foundry and Coal Combustion Byproducts written by Jacob J. Sauer and published by . This book was released on 2006 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Leaching from Soil Stabilized with Fly Ash written by Kanokwan Komonweeraket and published by . This book was released on 2010 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Geoenvironmental and Engineering Properties of Rock Soil and Aggregate written by National Research Council (U.S.). Transportation Research Board and published by Transportation Research Board National Research. This book was released on 1992 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ammonia Effect on Fly Ash Heavy Metal Leaching written by Hao Wang and published by . This book was released on 2003 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Leaching of Metals from High Carbon Fly Ash Mixed Soils written by Bora Cetin and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of the Heavy Metal Immobilization Agents on the Strength of Fly Ash Treated Soils and the Long term Stability of the Agents written by Shahid Rehman and published by . This book was released on 2014 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: In United States, a large amount of electricity is produced by the burning of coal in power plants produce an immense amount of ash (bottom and fly ash) each year. Fly ash contains hazardous or toxic materials such as heavy metals. If without appropriate treatments, before dumping fly ash in land-fills, heavy metals may leach from the fly ash and contaminate the ground water. This study describes the laboratory evaluation of the effects of the heavy metal immobilization agent on the strength of fly ash treated soil and the long term stability of the immobilization agent. Ethylenediaminetetraacetic acid (EDTA) and Triple Super Phosphate (TSP) were used as immobilization agents and mixed at different ratios, ranging from 0 % to 6 %, with fly ash to check the effect on geotechnical properties of fly ash and long-term resistance to heavy metals found in fly ash. Two types of fly ash, Class C and Class F were mixed with different dosage of TSP (0 % to 6 %) and EDTA (0 % to 1 %) at optimum moisture contents (OMC) to achieve a compacted structural fills. The geotechnical properties of the samples were tested by means of unconfined compressive strength (ASTM-D2166/D2166M-13) at curing periods of 7, 14 and 28 days and for the long-term stability of the agents were tested by the means of standard test method for leaching solid material in a column apparatus (ASTM-D4874-95). For fly ash Class C, adding either EDTA or TSP decreased the fly ash's compressive strength. At 28 days, the average peak compressive strength of the cured fly ash specimens was 1549 kPa. EDTA lowered the compressive strength to 958 from 1549 kPa, while TSP lowered the compressive strength to 950 from 1549 kPa. Fly ash only gives a max compressive strength because of its cementious nature. For fly ash Class F, EDTA did not noticeably affect on the compressive strength of the fly ash, but TSP increased the strength. When TSP was added to fly ash, it showed increase from 58 (fly ash only) to 161 kPa. To immobilize the heavy metal from fly ash, it is recommended to use TSP as chelating agent to achieve the maximum compressive strength. TSP showing the same compressive strength compared to EDTA at 28 days curing time and TSP is very cheap compared to EDTA. For long-term stability of the immobilization agent used with fly ash Class C, it was founded that TSP worked well for almost all of the heavy metals except As. EDTA also showed good immobilization to heavy metals except Hg and Pb. For fly ash Class F, TSP showed better results for the stabilization of Hg and Pb and worst towards As. Addition of EDTA enhanced the stabilization of Cd, Cr, Zn, and As. EDTA gave good response to some metals and TSP gave well to others. The combination of EDTA and TSP showed excellent results towards immobilization of the metals.
Download or read book Clean Coal Technologies written by Rajesh Kumar Jyothi and published by Springer Nature. This book was released on 2021-05-10 with total page 665 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the state of art of the several advanced approaches to beneficiation of coal. The influence of recent technology attains the advantages of processing coal, purification studies, rheological behavior, and the mineral beneficiation. The experts collected in this volume have contributed significantly to the enrichment in the in depth knowledge not only in context of working knowledge, but also future prospects of clean coal technology.
Download or read book Geoenvironmental Impacts of Using High Carbon Fly Ash in Structural Fill Applications written by Ahmet H. Aydilek and published by . This book was released on 2013 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study evaluated the leaching potential of metals from highway base layers stabilized with high carbon fly ashes (HCFAs) and highway embankment structures amended with HCFA. Three different laboratory tests were conducted: (1) batch water leach tests, (2) toxicity characteristics leaching procedure tests, and (3) column leach test. Additionally, two numerical modeling analyses were conducted: (1) WiscLEACH and (2) MINTEQA2. Analyses were conducted on eight fly ashes and two locally available sandy soil materials that are mainly used in highway base layer and highway embankment structures.
Download or read book Foundation Engineering written by National Research Council (U.S.). Transportation Research Board and published by Transportation Research Board National Research. This book was released on 1992 with total page 1126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
