Researchers from Henan Normal University in China have developed a genetically- and nano-engineered form of the common bacterium Escherichia coli (E. coli) that can consume carbon-containing compounds in sewage and generate electricity. This breakthrough could revolutionize the field of microbial fuel cells, which aim to degrade contaminants and produce electricity simultaneously. The researchers used genetic engineering to enhance E. coli’s production of cytochrome c, a protein involved in cellular energy balance, and then coated the bacteria with polypyrrole, an electricity-conducting polymer, to enhance electricity transfer. The resulting microbial fuel cells showed a power output comparable to high-performance biofuel cells, with the E. coli consuming organic compounds faster and generating a more powerful electric current than other bacteria. The nanocoating had no impact on the bacteria’s viability or reproduction, allowing them to continue generating electricity as long as their food source lasted. This technology has the potential to provide a sustainable solution for wastewater treatment and energy production.
Microbes in controlled cultures can purify wastewater while simultaneously producing electricity
