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

作者：Mateos L M; Villadangos A F; Santana L K; Pereira F J; de la Rubia A G; Gil J A; Aller A J^*

来源：Environmental Science and Pollution Research, 2016, 23(23): 24215-24229.

DOI：10.1007/s11356-016-7596-y

• Cobalt bioaccumulation
• Modelling
• Pollution
• Adsorption
• Bioremediation
• Kinetic parameters
• Green chemistry
• Bacillus

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 {Co2+} 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 Co2+ 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 Co2+ 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 Co2+ 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.

• 出版日期2016-12