Comparative mathematical modelling of a green approach for bioaccumulation of cobalt from wastewater.

Autor: Mateos LM; Department of Molecular Biology, Area of Microbiology, Faculty of Biological and Environmental Sciences, University of León, 24071, León, Spain., Villadangos AF; Department of Molecular Biology, Area of Microbiology, Faculty of Biological and Environmental Sciences, University of León, 24071, León, Spain., Santana LK; Department of Molecular Biology, Area of Microbiology, Faculty of Biological and Environmental Sciences, University of León, 24071, León, Spain.; Laboratório de Armazenamento de Energia e Tratamento de Efluentes, Instituto de Química, Universidade Federal de Uberlândia-MG, Av. João Naves de Ávila, 2121, CEP 38408-100, Uberlândia, Brazil., Pereira FJ; Department of Applied Chemistry and Physics, Area of Analytical Chemistry, Faculty of Biological and Environmental Sciences, University of León, 24071, León, Spain., de la Rubia AG; Department of Molecular Biology, Area of Microbiology, Faculty of Biological and Environmental Sciences, University of León, 24071, León, Spain., Gil JA; Department of Molecular Biology, Area of Microbiology, Faculty of Biological and Environmental Sciences, University of León, 24071, León, Spain., Aller AJ; Department of Applied Chemistry and Physics, Area of Analytical Chemistry, Faculty of Biological and Environmental Sciences, University of León, 24071, León, Spain. aj.aller@unileon.es.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2016 Dec; Vol. 23 (23), pp. 24215-24229. Date of Electronic Publication: 2016 Sep 19.
DOI: 10.1007/s11356-016-7596-y
Abstrakt: Cobalt is an essential element, but its wide use in industry generates important environmental and biological problems. The present study explores theoretical and empirical models of a green process for cobalt {Co 2+ } bioaccumulation from aqueous solutions. Two Gram-positive Bacillus subtilis species, strains CECT 4522 and LMM (the latter a former laboratory isolate from wastewater samples, which was phylogenetically characterized for the present work), were selected among others as the best Co 2+ accumulation systems. Mathematical models representing kinetic and steady-state conditions for discrete and large amounts of bacterial biomass were expanded. In this way, it was possible to theoretically calculate the amount of Co 2+ retained on the outer cell wall layer and incorporated inside the cell at any time. Theoretical and empirical hyperbolic-type models were suitable to fit the experimental bioaccumulation data for discrete amounts of bacteria biomass. In addition, kinetic relationships between the amount of Co 2+ accumulated and the time before (or after) reaching steady state were established for large amounts of bacterial biomass. Other kinetic approaches were also satisfactorily tested. The two Gram-positive bacteria assayed are promising agents for developing heavy metal removal systems from industrial waste.
Databáze: MEDLINE
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