Imagine a world where organic waste not only disappears, but is transformed into a source of renewable energy. This is not science fiction, but a developing reality thanks to electrogenic bacteria. These amazing microorganisms, such as those of the genera Geobacter and Shewanella, have the unique ability to generate electricity while "breathing" common materials in their environment.
Unlike humans who use oxygen, these bacteria use molecules such as iron oxides or even electrodes to release electrons, a process that is essentially external respiration. When grown in a controlled environment within what are known as Microbial Fuel Cells (MFCs), these bacteria form a biofilm on an anode, oxidizing organic matter and releasing electrons that flow through an external circuit, generating an electric current.
This technology promises a dual advantage: wastewater cleanup and clean electricity production. MFCs can treat industrial and domestic effluents, and even generate energy from sludge or marine sediments. Researchers from universities such as the University of Massachusetts Amherst have been at the forefront, demonstrating the potential of Geobacter to power small devices. Although current efficiency is still low for large-scale applications, progress is constant, opening a window to a more sustainable future where waste becomes a valuable energy resource.
Source: University of Massachusetts Amherst, Nature Biotechnology
