The Experts below are selected from a list of 8142 Experts worldwide ranked by ideXlab platform
Osman Nuri Ergun - One of the best experts on this subject based on the ideXlab platform.
-
use of fly ash phosphogypsum and red mud as a Liner Material for the disposal of hazardous zinc leach residue waste
Journal of Hazardous Materials, 2010Co-Authors: Semra Coruh, Osman Nuri ErgunAbstract:Increasing amounts of residues and waste Materials coming from industrial activities in different processes have become an increasingly urgent problem for the future. The release of large quantities of heavy metals into the environment has resulted in a number of environmental problems. The present study investigated the safe disposal of the zinc leach residue waste using industrial residues such as fly ash, phosphogypsum and red mud. In the study, leachability of heavy metals from the zinc leach residue has been evaluated by mine water leaching procedure (MWLP) and toxicity characteristic leaching procedure (TCLP). Zinc removal from leachate was studied using fly ash, phosphogypsum and red mud. The adsorption capacities and adsorption efficiencies were determined. The adsorption rate data was analyzed according to the pseudo-second-order kinetic, Elovich kinetic and intra-particle diffusion kinetic models. The pseudo-second-order kinetic was the best fit kinetic model for the experimental data. The results show that addition of fly ash, phosphogypsum and red mud to the zinc leach residue drastically reduces the heavy metal content in the leachate and could be used as Liner Materials.
-
use of fly ash phosphogypsum and red mud as a Liner Material for the disposal of hazardous zinc leach residue waste
Journal of Hazardous Materials, 2010Co-Authors: Semra Coruh, Osman Nuri ErgunAbstract:Increasing amounts of residues and waste Materials coming from industrial activities in different processes have become an increasingly urgent problem for the future. The release of large quantities of heavy metals into the environment has resulted in a number of environmental problems. The present study investigated the safe disposal of the zinc leach residue waste using industrial residues such as fly ash, phosphogypsum and red mud. In the study, leachability of heavy metals from the zinc leach residue has been evaluated by mine water leaching procedure (MWLP) and toxicity characteristic leaching procedure (TCLP). Zinc removal from leachate was studied using fly ash, phosphogypsum and red mud. The adsorption capacities and adsorption efficiencies were determined. The adsorption rate data was analyzed according to the pseudo-second-order kinetic, Elovich kinetic and intra-particle diffusion kinetic models. The pseudo-second-order kinetic was the best fit kinetic model for the experimental data. The results show that addition of fly ash, phosphogypsum and red mud to the zinc leach residue drastically reduces the heavy metal content in the leachate and could be used as Liner Materials.
-
removal of cu ii from leachate using natural zeolite as a landfill Liner Material
Journal of Hazardous Materials, 2009Co-Authors: Gamze N Turan, Osman Nuri ErgunAbstract:All hazardous waste disposal facilities require composite Liner systems to act as a barrier against migration of contaminated leachate into the subsurface environment. Removal of copper(II) from leachate was studied using natural zeolite. A serial of laboratory systems on bentonite added natural zeolite was conducted and copper flotation waste was used as hazardous waste. The adsorption capacities and sorption efficiencies were determined. The sorption efficiencies increased with increasing natural zeolite ratio. The pseudo-first-order, the pseudo-second-order, Elovich and the intra-particle diffusion kinetic models were used to describe the kinetic data to estimate the rate constants. The second-order model best described adsorption kinetic data. The results indicated that natural zeolite showed excellent adsorptive characteristics for the removal of copper(II) from leachate and could be used as very good Liner Materials due to its high uptake capacity and the abundance in availability.
Semra Coruh - One of the best experts on this subject based on the ideXlab platform.
-
use of fly ash phosphogypsum and red mud as a Liner Material for the disposal of hazardous zinc leach residue waste
Journal of Hazardous Materials, 2010Co-Authors: Semra Coruh, Osman Nuri ErgunAbstract:Increasing amounts of residues and waste Materials coming from industrial activities in different processes have become an increasingly urgent problem for the future. The release of large quantities of heavy metals into the environment has resulted in a number of environmental problems. The present study investigated the safe disposal of the zinc leach residue waste using industrial residues such as fly ash, phosphogypsum and red mud. In the study, leachability of heavy metals from the zinc leach residue has been evaluated by mine water leaching procedure (MWLP) and toxicity characteristic leaching procedure (TCLP). Zinc removal from leachate was studied using fly ash, phosphogypsum and red mud. The adsorption capacities and adsorption efficiencies were determined. The adsorption rate data was analyzed according to the pseudo-second-order kinetic, Elovich kinetic and intra-particle diffusion kinetic models. The pseudo-second-order kinetic was the best fit kinetic model for the experimental data. The results show that addition of fly ash, phosphogypsum and red mud to the zinc leach residue drastically reduces the heavy metal content in the leachate and could be used as Liner Materials.
-
use of fly ash phosphogypsum and red mud as a Liner Material for the disposal of hazardous zinc leach residue waste
Journal of Hazardous Materials, 2010Co-Authors: Semra Coruh, Osman Nuri ErgunAbstract:Increasing amounts of residues and waste Materials coming from industrial activities in different processes have become an increasingly urgent problem for the future. The release of large quantities of heavy metals into the environment has resulted in a number of environmental problems. The present study investigated the safe disposal of the zinc leach residue waste using industrial residues such as fly ash, phosphogypsum and red mud. In the study, leachability of heavy metals from the zinc leach residue has been evaluated by mine water leaching procedure (MWLP) and toxicity characteristic leaching procedure (TCLP). Zinc removal from leachate was studied using fly ash, phosphogypsum and red mud. The adsorption capacities and adsorption efficiencies were determined. The adsorption rate data was analyzed according to the pseudo-second-order kinetic, Elovich kinetic and intra-particle diffusion kinetic models. The pseudo-second-order kinetic was the best fit kinetic model for the experimental data. The results show that addition of fly ash, phosphogypsum and red mud to the zinc leach residue drastically reduces the heavy metal content in the leachate and could be used as Liner Materials.
M. Uma Shankar - One of the best experts on this subject based on the ideXlab platform.
-
Studies on Hydraulic Conductivity of Fly Ash-Stabilised Expansive Clay Liners
Geotechnical and Geological Engineering, 2015Co-Authors: B. R. Phanikumar, M. Uma ShankarAbstract:Earthen barriers or clay Liners are a major concern in geo-environmental engineering. They are designed to preclude or reduce leachate migration. Hence, a low hydraulic conductivity (k) is an important parameter in the design of clay Liners. Materials such as bentonite and lateritic clays, which have a low hydraulic conductivity at high dry densities, are used in the construction of clay Liners. Compacted expansive clays which are high in montmorillonite content also have a very low hydraulic conductivity. When expansive clays are blended with fly ash, an industrial waste, the hydraulic conductivity further reduces as the ash-clay blends result in increased dry densities at increased fly ash contents. Hence, fly ash-stabilised expansive clay can also be proposed as an innovative clay Liner Material. It is, therefore, required to study various physical and engineering properties of this new clay Liner Material. Liquid limit (LL) and free swell index (FSI) are important index properties to be studied in the case of this clay Liner Material. The hydraulic conductivity of this new clay Liner Material depends on the fly ash content in the blend. Further, parameters such as solute concentration and kinematic viscosity also influence hydraulic conductivity of clay Liners. This paper presents experimental results obtained on hydraulic conductivity (k) of fly ash-stabilised expansive clay Liner at varying fly ash content and solute concentration. The tests were performed with deionised water (DIW), CaCl2, NaCl and KCl as permeating fluids. Fly ash content in the blend was varied as 0, 10, 20 and 30 % by weight of the expansive clay, and the solute concentration was varied as 5 mM (milli molar), 10, 20, 50, 100 and 500. It was found that hydraulic conductivity (k) decreased with increasing fly ash content, solute concentration and kinematic viscosity. Further, hydraulic conductivity (k) was correlated with LL and FSI of the clay Liner Material for different fly ash contents and solute concentrations. Useful correlations were obtained.
B. R. Phanikumar - One of the best experts on this subject based on the ideXlab platform.
-
Studies on Hydraulic Conductivity of Fly Ash-Stabilised Expansive Clay Liners
Geotechnical and Geological Engineering, 2015Co-Authors: B. R. Phanikumar, M. Uma ShankarAbstract:Earthen barriers or clay Liners are a major concern in geo-environmental engineering. They are designed to preclude or reduce leachate migration. Hence, a low hydraulic conductivity (k) is an important parameter in the design of clay Liners. Materials such as bentonite and lateritic clays, which have a low hydraulic conductivity at high dry densities, are used in the construction of clay Liners. Compacted expansive clays which are high in montmorillonite content also have a very low hydraulic conductivity. When expansive clays are blended with fly ash, an industrial waste, the hydraulic conductivity further reduces as the ash-clay blends result in increased dry densities at increased fly ash contents. Hence, fly ash-stabilised expansive clay can also be proposed as an innovative clay Liner Material. It is, therefore, required to study various physical and engineering properties of this new clay Liner Material. Liquid limit (LL) and free swell index (FSI) are important index properties to be studied in the case of this clay Liner Material. The hydraulic conductivity of this new clay Liner Material depends on the fly ash content in the blend. Further, parameters such as solute concentration and kinematic viscosity also influence hydraulic conductivity of clay Liners. This paper presents experimental results obtained on hydraulic conductivity (k) of fly ash-stabilised expansive clay Liner at varying fly ash content and solute concentration. The tests were performed with deionised water (DIW), CaCl2, NaCl and KCl as permeating fluids. Fly ash content in the blend was varied as 0, 10, 20 and 30 % by weight of the expansive clay, and the solute concentration was varied as 5 mM (milli molar), 10, 20, 50, 100 and 500. It was found that hydraulic conductivity (k) decreased with increasing fly ash content, solute concentration and kinematic viscosity. Further, hydraulic conductivity (k) was correlated with LL and FSI of the clay Liner Material for different fly ash contents and solute concentrations. Useful correlations were obtained.
-
correlation studies on index properties of fly ash stabilised expansive clay Liners
Geomechanics and Geoengineering, 2012Co-Authors: Uma M Shankar, B. R. PhanikumarAbstract:The study of earthen barriers or clay Liners has become very important in the field of geo-environmental engineering. The design of clay Liners is based on the fact that leachate migration through clay Liners depends on their hydraulic conductivity. The engineering behaviour of clay Liners can be predicted through a proper estimation of some of the basic index properties like liquid limit which play a significant role in this study. An attempt at understanding the variation of index properties with the concentration of permeating fluids reveals useful facts about the clay Liners. This paper proposes an innovative clay Liner Material in the form of fly ash-stabilised (or, fly ash-blended) expansive clay and presents a study on variation of index properties of the blend with varying fly ash content in the blend and concentration of salt solutions. The various permeating liquids used were deionised water and salt solutions such as CaCl2, NaCl and KCl. When expansive soils are stabilized with fly ash, index p...
Nanthanit Charoenthaisong - One of the best experts on this subject based on the ideXlab platform.
-
Potential use of lateritic and marine clay soils as landfill Liners to retain heavy metals.
Waste Management, 2008Co-Authors: Tanit Chalermyanont, Surapon Arrykul, Nanthanit CharoenthaisongAbstract:Abstract The potential of a lateritic soil and a marine clay, typical of those found in hot and humid climatic regions, was assessed for use as a landfill Liner Material. A series of tests were conducted – physical and chemical, batch adsorption, column, hydraulic conductivity, etc., – to evaluate the heavy metal sorption capacity, chemical compatibility of hydraulic conductivity, and transport parameters of the soils. Experimental results showed that the marine clay had better adsorption capacity than that of the lateritic soil and that its hydraulic conductivity was an order of magnitude lower. In addition, the hydraulic conductivities of both soils when permeated with low concentration heavy metal solutions were below 1 × 10 −7 cm/s. When permeated with Cr, Pb, Cd, Zn, and Ni solutions, the retardation factors of the lateritic soil and the marine clay ranged from 10 to 98 and 37 to 165, respectively, while the diffusion coefficients ranged from 1.0 × 10 −5 to 7.5 × 10 −6 and 3.0 to 9.14 × 10 −7 cm 2 /s, respectively. For both soils, Cr and Pb were retained relatively well, while Cd, Zn, and Ni were more mobile. The marine clay had higher retardation factors and lower diffusion coefficients, and its hydraulic conductivity was more compatible with Cr solution, than that of the lateritic soil. In general, the properties of the marine clay indicate that it has significant advantages over the lateritic soil as landfill Liner Material.