Biogas plants produce methane along with more than 40 percent CO2 which has been released into the atmosphere in conventional biogas plants. Researchers from the Fraunhofer Institute for Microengineering and Microsystems IMM have now found a way to convert this waste product into additional methane, thus drastically increasing the methane yield from biogas plants. The process is up and running and the research team is currently scaling up the demonstration plant to five cubic meters of methane per hour.