title: Use of fly ash, phosphogypsum and red mud as a liner material for the disposal of hazardous zinc leach residue waste.
abstract: 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.
authors.affiliation: Department of Environmental Engineering, Ondokuz Mayis University, 55139 Samsun, Turkey. semcoruh@omu.edu.tr
authors.forename: Semra
authors.initials: S
authors.lastname: Coruh
authors.forename: Osman Nuri
authors.initials: ON
authors.lastname: Ergun
mesh_terms: D000327:Adsorption; D000465:Algorithms; D002133:Calcium Sulfate / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D060729:Coal Ash; D004058:Diffusion; D015386:Hazardous Substances / Q000032:analysis*; D007220:Industrial Waste / Q000032:analysis*; D007700:Kinetics; D008906:Mining; D015233:Models, Statistical; D052638:Particulate Matter / Q000737:chemistry*; D012037:Refuse Disposal / Q000379:methods*; D012995:Solubility; D013054:Spectrophotometry, Atomic; D014874:Water Pollutants, Chemical; D017967:Zinc Compounds / Q000737:chemistry*
chemical_list: D060729:Coal Ash; D015386:Hazardous Substances; D007220:Industrial Waste; D052638:Particulate Matter; D014874:Water Pollutants, Chemical; D017967:Zinc Compounds; D002244:Carbon; D002133:Calcium Sulfate