Biohybrid membranes for effective bacterial vehiculation and simultaneous removal of hexavalent chromium (CrVI) and phenol
Autor: | Silvia Goyanes, Paola S. González, Elizabeth Agostini, Gustavo M. Morales, Jonathan Cimadoro, Marilina Fernandez, Paola Pereira |
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Rok vydání: | 2021 |
Předmět: |
0303 health sciences
biology 030306 microbiology Environmental remediation Microorganism General Medicine Acinetobacter guillouiae biology.organism_classification Applied Microbiology and Biotechnology 03 medical and health sciences chemistry.chemical_compound Membrane Adsorption Bioremediation chemistry Phenol Hexavalent chromium 030304 developmental biology Biotechnology Nuclear chemistry |
Zdroj: | Applied Microbiology and Biotechnology. 105:827-838 |
ISSN: | 1432-0614 0175-7598 |
Popis: | The aim of the present study was to obtain an effective vehiculation system in which bacterial agents could maintain viability improving their removal capacity. Herein, we present a novel biohybrid membrane of polymeric nanofibers and free-living bacteria for the simultaneous removal of pollutants. In this system, bacteria are free within the pores between the nanofibers and adsorbed to the surface of the membranes. Association between bacteria and the membranes was performed through a self-formulated medium, and the presence of the bacteria in the polymeric matrix was evidenced through atomic force microscopy (AFM). Biohybrid membranes associated with the remediation agents Bacillus toyonensis SFC 500-1E and Acinetobacter guillouiae SFC 500-1A promoted a reduction of up to 2.5 mg/L of hexavalent chromium and up to 200 mg/L of phenol after 24 h of treatment in synthetic medium containing the contaminants. Similarly, more than 46% of the hexavalent chromium and all of the phenol content were removed after treatment of a tannery effluent with initial concentrations of 7 mg/L of Cr(VI) and 305 mg/L of phenol. Counts of the remediation agents from the membranes were always above 1.107 CFU/g, also in the reutilization assays performed without reinoculation. Biohybrid membranes were hydrolysis-resistant, reusable, and effective in the simultaneous removal of contaminants for more than 5 cycles. Viability of the microorganisms was maintained after long-term storage of the membranes at 4 °C, without the use of microbiological media or the addition of cryoprotectants. Graphical abstract KEY POINTS: • Polymeric membranes were effectively associated with the SFC 500-1 remediation consortium • Biohybrid membranes removed hexavalent chromium and phenol from different matrices • Removal of contaminants was achieved in many successive cycles without reinoculation. |
Databáze: | OpenAIRE |
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