title: Solidification of Cd-bearing zeolitic tuff by reaction with lime.
abstract: This article aims to find a reliable procedure by which to remove Cd(2+) from water and store it safely. The proposed procedure includes Cd(2+) uptake by a zeolitic tuff, a natural cation exchanger, followed by stabilization of the contaminated solid in a hardened lime matrix. Several tuff-lime pastes were examined and their safety tested by cation leaching and mechanical strength measurement. It was demonstrated that a very cheap mixture, containing only 10% lime, is able to safely retain the harmful cation and may be disposed of in a segregated landfill.
authors.affiliation: Dipartimento di Scienze della Terra, Università Federico II, Naples, Italy.
authors.forename: Abner
authors.initials: A
authors.lastname: Colella
authors.forename: Bruno
authors.initials: B
authors.lastname: de Gennaro
authors.forename: Domenico
authors.initials: D
authors.lastname: Caputo
authors.forename: Carmine
authors.initials: C
authors.lastname: Colella
mesh_terms: D002104:Cadmium / Q000737:chemistry / Q000302:isolation & purification*; D017610:Calcium Compounds; D002412:Cations / Q000032:analysis; D010087:Oxides; D012037:Refuse Disposal / Q000379:methods*; D014865:Waste Disposal, Fluid / Q000379:methods; D017641:Zeolites / Q000737:chemistry
chemical_list: D017610:Calcium Compounds; D002412:Cations; D010087:Oxides; C554923:chabazite; D002104:Cadmium; D017641:Zeolites; C016538:lime