The influence of different metal ions on light scattering properties of pattern microbial fuel cells' bacteria Desulfuromonas acetoxidans

Abstract

Microbial fuel cell (MFC) technologies represent the newest approach for generating electricity -bioelectricity generation from biomass using bacteria. Desulfuromonas acetoxidans are aquatic obligatory anaerobic sulfur-reducing bacteria that possess an ability to produce electric current in the processes of organic matter oxidation and Fe 3+ -or Mn 4+ -reduction. These are pattern objects for MFC systems. They could be applied as a highly effective and self-sustaining model of wastewater treatment which contains energy in the form of biodegradable organic matter. But wastewaters contain high concentrations of xenobiotics, such as different heavy metals that have a detrimental effect towards all living organisms. The influence of different concentrations of MnCl 2 ×4H 2 O, FeSO 4 CuSO 4 , CdSO 4 , ZnSO 4 and PbNO 3 on light scattering properties of aquatic D. acetoxidans bacteria on the base of their cells' size distribution and relative content has been investigated by the new method of measurement. The cell distribution curve was in the range of 0.4 -1.4 µm. The most crucial changes of cell concentration dependences, compared with other investigated metal ions, have been observed under the influence of copper ions. The ability of D. acetoxidans bacteria to produce electric current upon the specific cultivation conditions and the influence of Fe 2+ and Mn 2+ has been verified.

The Anode Biocatalyst with Simultaneous Transition Metals Pollution Control

“…Biomass accumulation of D. acetoxidans IMV B-7384, its cell size distribution and relative content changes have been carried out [14,15]. Investigated bacterium has been shown to accumulate biomass the most intensively during third-fourth days of its growth.…”

“…Previous research has shown that gram-negative bacterium Desulfuromonas acetoxidans possesses resistance to copper, cadmium, lead, zinc, manganese, iron, etc. [14,15]. Bacteria of Desulfuromonas genus are also shown to be highly effective in term of electricity generation [2,16,17].…”