title: Application of flotation for the separation of metal-loaded zeolites.
abstract: Several industrial wastewater streams may contain heavy metal ions, which must be effectively removed, before the discharge or reuse of treated waters could take place. Different bonding materials, presenting selectivity and fast reaction kinetics for the removal of metals, have been examined for this purpose. The objective of the present paper was to investigate the application of dispersed-air flotation for the separation of metal-loaded sorbents. Two similar zeolite samples were applied as effective bonding agents for the removal of zinc, a toxic metal commonly found in many industrial wastewaters. This combined process, termed sorptive flotation, involves the preliminary scavenging of metal ions, by using the appropriate sorbent particles (usually present as ultrafine particulates), followed by flotation for the effective separation of them. The obtained results were very promising, as both metal and sorbent were effectively removed/separated from the dispersion.
authors.affiliation: Section of Chemical Technology and Industrial Chemistry, School of Chemistry, Aristotle University, P.O. Box 116, GR-541 24 Thessaloniki, Greece.
authors.forename: Kostas A
authors.initials: KA
authors.lastname: Matis
authors.forename: Anastasios I
authors.initials: AI
authors.lastname: Zouboulis
authors.forename: George P
authors.initials: GP
authors.lastname: Gallios
authors.forename: Torsten
authors.initials: T
authors.lastname: Erwe
authors.forename: Christoph
authors.initials: C
authors.lastname: Blöcher
mesh_terms: D000327:Adsorption; D007700:Kinetics; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods*; D017641:Zeolites / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
chemical_list: D014874:Water Pollutants, Chemical; D017641:Zeolites; D015032:Zinc