title: Microbacterium oxydans and Microbacterium liquefaciens: a biological alternative for the treatment of Ni-V-containing wastes.
abstract: The present study evaluated 15 isolates obtained of environmental samples capable of tolerating high Ni and V concentrations. Those coded as MNSH2-PHGII-1, MNSH2-PHGII-2 and MV-PHGII-2 showed a minimum inhibitory concentration higher than 200 ppm for Ni and V and showed removal percentages corresponding to 84, 75 and 26% for Ni and 60, 55 and 20.3% for V, respectively, in liquid medium. When spent catalyst was added at 16% (w/v) pulp density, the highest Ni and V removal corresponded to MNSH2-PHGII-1 and MNSH2-PHGII-2, which were identified as Microbacterium oxydans and Microbacterium liquefaciens respectively, Microbacterium oxydans was able to remove Ni at the extent of 45.4% and V at 30.4% while Microbacterium liquefaciens removed Ni at 51% and V at 41.4% from the spent catalyst. The isolate MV-PHGII-2 identified also as Microbacterium oxydans showed the lowest removal for Ni and V corresponding to 16% and 9.5%, respectively. This is the first report where strains of Microbacterium were tested for their abilities to remove Ni and V from spent catalyst, suggesting its potential use in the treatment of this solid industrial waste.
authors.affiliation: a Department of Biotechnology , Research Center in Applied Science and Advanced Technology of the National Polytechnic Institute , Querétaro , México.
authors.forename: Marlenne
authors.initials: M
authors.lastname: Gómez-Ramírez
authors.forename: Luis A
authors.initials: LA
authors.lastname: Montero-Álvarez
authors.forename: Alfredo
authors.initials: A
authors.lastname: Tobón-Avilés
authors.forename: Grisel
authors.initials: G
authors.lastname: Fierros-Romero
authors.forename: Norma G
authors.initials: NG
authors.lastname: Rojas-Avelizapa
mesh_terms: D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D052918:Environmental Restoration and Remediation / Q000379:methods*; D007220:Industrial Waste; D008800:Mexico; D009532:Nickel / Q000378:metabolism*; D059392:Petroleum Pollution; D014639:Vanadium / Q000378:metabolism*
chemical_list: D007220:Industrial Waste; D014639:Vanadium; D009532:Nickel
keywords: Isolation; Microbacterium; metals; removal; spent catalyst