title: Reuse of a treated red mud bauxite waste: studies on environmental compatibility.
abstract: Red mud is the major solid waste produced in the process of alumina extraction from bauxite (Bayer process). Environmental "compatibility" of a treated red mud was studied in order to evaluate its possible recycling in environmental compartments. The leaching test requested by the Italian law on treated solid waste to be "re-introduced in the environment" was performed on this material. Moreover, in order to better evaluate the environmental compatibility, three different types of eco-toxicological tests were applied (Microtox test, ASTM microalgae toxicity test and sea urchin embryo toxicity test). These "chemical" and eco-toxicological tests gave encouraging results. The possibility to use this material for treating contaminated waters and soils was evaluated, again with particular attention to the Italian regulatory system, through experiments on the treated red mud metal trapping ability and on the subsequent release of trapped metals, at low pH conditions. The treated red mud showed a general high metal trapping capacity and the release at low pH was generally low.
authors.affiliation: ENEA-PROT-CHIM, C.R. Casaccia Via Anguillarese 301, 00060 Roma, Italy. claudia.brunori@casaccia.enea.it
authors.forename: Claudia
authors.initials: C
authors.lastname: Brunori
authors.forename: Carlo
authors.initials: C
authors.lastname: Cremisini
authors.forename: Paolo
authors.initials: P
authors.lastname: Massanisso
authors.forename: Valentina
authors.initials: V
authors.lastname: Pinto
authors.forename: Leonardo
authors.initials: L
authors.lastname: Torricelli
mesh_terms: D000537:Aluminum Oxide; D000818:Animals; D003247:Conservation of Natural Resources; D007220:Industrial Waste; D012037:Refuse Disposal / Q000379:methods*; D012617:Sea Urchins
chemical_list: D007220:Industrial Waste; D000537:Aluminum Oxide