The holy grail of bio-fuel researchers is to develop a self-sustaining process that converts waste from sewage, food crops, algae and other renewable carbon sources into fuels, while keeping waste carbon out of our atmosphere and water. Much progress has been made in converting such waste to useful fuel but completing the cycle using clean energy has proved a tough nut to crack.
Click here for original story, Process removes biofuel contaminants from wastewater and generates hydrogen to fuel its own operation
Source: Phys.org