Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 32 for “"Leachability"”.
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Evaluating Leachability of Residual Solids from Hydraulic Fracturing in the Marcellus Shale
The process of natural gas extraction through hydraulic fracturing produces large quantities of fluid containing naturally-occurring salt, radionuclides, and heavy metals which form residual solids during storage and treatment. The purpose of this research was to characterize the residual solids …
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Dissipation and Leachability of Formulated Chlorpyrifos and Atrazine in Organically-amended Soils
… were 175 and 40 days, respectively. The leachability of chlorpyrifos from contaminated soil was dramatically reduced by 82% during the first 30 days of incubation in treatments amended with vegetable oil and peat moss while only a 28% of reduction in leachability occurred in the …
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Evaluating the Leachability of Elements from Residuals Generated by Hydraulic Fracturing in Marcellus Shale
The purpose of this research was to characterize the residual solids produced from hydraulic fracturing operations in the Marcellus Shale region. Four field samples were evaluated: drilling mud, treated sludge from the chemical treatment of process water, solids from the gravity settling of …
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Evaluating Leachability of Residual Solids Generated from Unconventional Shale Gas Production Operations in Marcellus Shale
Hydraulic fracturing operations utilized for shale gas production result in the generation of a large volume of flowback and produced water that contain suspended material, salts, hydrocarbons, metals, chemical additives, and naturally-occurring radioactive material. The water is impounded at …
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Leachability of uranium and other elements from freshly erupted volcanic ash and Water-soluble material on aerosols collected within volcanic eruption clouds
Includes bibliographical references (pages 78-87, 179-182).
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Stabilization/solidification of lead contaminated soil using cement incorporated with sugarcane bagasse
… to investigate the effect of soil strength and leachability of lead in S/S method when sugarcane bagasse (SCB) is added to remedy contaminated soil. Synthetic contaminated soil was prepared in bulk by mixing soil samples with lead nitrate, Pb (NO3)2 to achieve the concentration of 500 ppm. After …
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Solidification and Stabilization of Contaminated Soil
… plan for this thesis involved bulk analysis and leachability tests to determine the initial and final level of contaminants in the soil and their potential leachability from the soil. The treated soil also underwent weight loss and air emissions (TO-3) tests.
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Phosphate and thermal stabilization of heavy metals in dredged sediments
… conserves resources. This research focused on leachability of metal contaminants subsequent to phosphate addition and thermal treatment at 700 C. X- ray absorption spectroscopy (XAS) in combination with principal component analysis, target transformation, and linear combination revealed that in …
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Properties and environmental impact of recycling cigarette butts (CBs) in fired clay brick
… physical and mechanical properties, leachability and indoor air quality. Therefore, clay soil samples obtained from Hoe Guan Brick Sdn Bhd were used as control in this research while 2.5% and 5.0% by weight of CBs were incorporated into the clay bricks for subsequent experiments. …
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Characterisation of groundwater in mainly old and closed landfill sites
… phase of landfill reactions will increase the leachability and mobility of many metal pollutants and particularly of lead. Studies on the leachability of lead in acetic acid media show how lead solubility is increased in acetic acid media by the formation of triacetatolead(II) species, …
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An evaluation of the applicability of the EPA Organic Leachate Model to leaching of solvent and non-solvent wastes
… This conclusion was drawn when the average "leachability ratio", or the ratio of leachate concentration to waste concentration for non-solvent compounds in solvent-bearing waste was found to be nearly four times the average leachability ratio for non-solvent compounds in wastes that did not …
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Chemical and biological factors affecting the performance of CCA and ACA treated wood in soil
… of nitrogen on the decay process, fixation and leachability of preservative elements and the role of lignin in the binding of nitrogen and preservative elements to wood.<br/><br/>Concentrations of surface nutrients, including nitrogen, present in CCA treated small blocks of both the hardwood …
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Environmental consequences associated with ash-stabilisation of organic sludges from the synthol process
… of lime in the system appears to lower the leachability of B, Mn, and Br while worsening the leachability of Fe, Ba, and Zn. However, addition of lime increases the leachability of B, Cr, Mn, Fe and Br in distilled water. The most likely source of B, Fe, Br and Ba is fine ash. Plant growth …
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Remediation of contaminated marine sediment using bentonite, kaolin and sand as capping materials
… effectiveness of B, K, and BK for preventing the leachability of the trace metals was assessed on a bench-scale laboratory experiment in glass tanks for 90 days, where 1cm thick layer of capping material and sand was placed above the contaminated sediment. The results showed that B and BK reduced …
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Effect of palm oil waste and quarry dust on the properties of hybrid blocks
… prisms, efflorescence, thermal conductivity, and leachability. Furthermore, the investigation on the durability of the blocks in laboratory accelerated tests and actual climatic exposure for 12 months also have been conducted. The hardened density ranged in 852.82 kg/m3 and 1561.21 kg/m3, and the …
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Modeling of Radiation Effects on the Chemical Durability of Nuclear Waste Forms (Leaching, Radioactive Glass Damage)
… study the effects of (alpha)-decay aging on the leachability of waste forms. Some of the results obtained by ion implantation have negative implications about the long-term durability of glassified forms; these results, however, have not been supported by those obtained by actinide doping. In …
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A laboratory study of solidification/stabilization technology for contaminated dredged material
… physical strength and reduction of chemical leachability resulting from solidification/stabilization A with various cement based, pozzolanic, and proprietary additives were analyzed. Also investigated was the immobilization capability of a proprietary polymer for selected organic contaminants …
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Stabilisation and solidification of contaminated soil using cement and sugarcane bagasse ash (SCBA)
… is to investigate the effect of physical and leachability of contaminated soil in S/S method when Sugarcane Bagasse Ash (SCBA) is added to remedy contaminated soil. Landfill contaminated soil was used to test the effectiveness of those binder. Cement was added at a proportion of 5%, 10%, 15% …
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Investigation of pollution coming from copper, lead, and zinc mining, and factors controlling mobility and bioavailability of pollutants at Ecton Hill, Staffordshire, UK
… soil values). Furthermore, the bioavailability, leachability, and fractionation (using five-steps sequential extraction) of the metals in various soil phases were characterised using correlation matrix and principal component analysis (PCA) approaches. The GIS- based spatial analysis maps reveal …
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Rare Earth Extraction from Clayey Waste Materials by Alkali Pretreatment
… clays). However, the low REE grades and poor leachability of REE-bearing species still make the recovery of REEs from coal-based clays challenging. The primary objective of this study is to develop leaching technologies that can extract REEs from clayey waste materials under mild conditions …
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