29 Mar 2012:
New Microbial Fuel Cell
Converts Raw Sewage into Electricity
U.S. scientists have developed a fuel cell capable of converting 13 percent of the energy found in sewage into electricity
, a process that its developers say could also more efficiently treat municipal wastewater. In a report released at the annual meeting of the American Chemical Society, researchers at the J. Craig Venter Institute describe a so-called microbial fuel cell that uses naturally existing microbes that produce electrons and protons as they metabolize the organic waste. The electrons are collected by an anode in one container, while the protons pass through a permeable membrane to a cathode in a separate container; the voltage between the electrodes produces an electric current
. The process is also capable of removing about 97 percent of the organic matter, the scientists say. While that would not be clean enough for re-use as drinking water, the researchers say the results suggest the technology could one day emerge an alternative in wastewater treatment processes. Treatment of wastewater and sewage currently consumes about 2 percent of the U.S. energy supply
, at a cost of about $25 billion annually.
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Tribal people and ranchers join together to stop a project that would haul coal across their Montana land. Watch the video.
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An aerial view of why Europe’s per capita carbon emissions are less than 50 percent of those in the U.S. View the photos.
The 2015 Yale e360 Video Contest winner documents a Northeastern town's bitter battle over a wind farm. Watch the video.
video series looks at the staggering amount of food wasted in the U.S. – a problem with major human and environmental costs. Watch the video.
video goes onto the front lines with Colorado firefighters confronting deadly blazes fueled by a hotter, drier climate. Watch the video.
A three-part series Tainted Harvest
looks at the soil pollution crisis in China, the threat it poses to the food supply, and the complexity of any cleanup. Read the series.