20 Sep '11, 11pm

Waste Water + Bacteria = Clean Energy ~ ~ #Eco #water #energy #bacteria #sustainability #green #health #biofuels

Hydrogen may be the ultimate clean fuel because burning it—in chemical terms, reacting it with oxygen—yields only water vapor. Previously, researchers have produced hydrogen gas in microbial-powered, batterylike fuel cells, but only when they supplemented the energy produced by the bacteria with electrical energy from external sources—such as that obtained from renewable sources or burning fossil fuels, says Bruce Logan, an environmental engineer at Pennsylvania State University, University Park. Also, by using devices that contain large stretches of permeable membranes that separate salt water from fresh, scientists have tapped the voltage difference that exists between them. But those devices create only a voltage difference; they don't generate the electrical current required to produce hydrogen, Logan notes. Hydrogen atoms are formed in such devices only when electrons...

Full article: http://www.enn.com/energy/article/43280

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