Study on the electron transport process of microbe on the mineral surface using the microbe fuel cell

The electron transfer process of microbe on the mineral surface was studied by the use of a microbe fuel cell. The results indicate that direct contact plays an important role in the process of reducing Fe(OH)₃ with Geobacte metallireducens, and the bio-film absorbed on the mineral surface is a key factor. Bio-film formation needs a relative long time. It is an important metabolic way to form bio-film by cell-absorption on the solid surface. Although mediate AQDS accelerates the reduction rate effectively at the early stage, but its effectiveness is not significant after the cell-absorption. So the microbe catalysis mineral oxidation-reduction reaction is influenced by bio-film. Accelerating the film formation on the mineral surface and keeping its stability are very important for the microbe leaching rate.