title: A two-front leach model for cement-stabilized heavy metal waste.
abstract: Quantitative scanning electron microscope (SEM) studies of cement-stabilized waste specimens exposed to a leaching solution at constant pH in the range 4-7 have shown that the acid neutralization capacity (ANC) of the waste matrix is consumed at two consecutive leaching fronts. The first front is associated with the dissolution of portlandite (Ca(OH)2) and the partial reaction of calcium silicate hydrate (CSH) gel. The second front marks the dissolution of Ca-Al hydroxy sulfate minerals. The advancement of the first front is limited by the diffusion of OH- ions from the first front toward the leaching solution. The advancement of the second front, however, is controlled by the diffusion of H+ ions from the leaching solution toward the second front. Leaching of copper, zinc, and lead only occurs between the second front and the specimen surface. The leaching behavior of metals is modeled by considering that metals are leached from the waste matrix as a result of the advancement of the second front. The proposed model takes into account the leachable metal fraction in the waste matrix and the effect of metal remineralization on metal mobility.
authors.affiliation: Department of Chemical Engineering, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario, Canada P7B 5E1.
authors.forename: Mohammad Z
authors.initials: MZ
authors.lastname: Islam
authors.forename: Lionel J J
authors.initials: LJ
authors.lastname: Catalan
authors.forename: Ernest K
authors.initials: EK
authors.lastname: Yanful
mesh_terms: D003252:Construction Materials; D004784:Environmental Monitoring; D019216:Metals, Heavy / Q000032:analysis* / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D008962:Models, Theoretical; D012037:Refuse Disposal / Q000379:methods*; D012989:Soil Pollutants / Q000032:analysis; D014873:Water Pollutants / Q000032:analysis
chemical_list: D019216:Metals, Heavy; D012989:Soil Pollutants; D014873:Water Pollutants