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Though harvesting energy from waste water has been discovered there is
definitely room for research and improvement.  Engineers at Oregon State
University have discovered that putting a nanoparticle coating on the anodes
in the fuels cells that transform the waste into currents increases
production nearly 20-fold.  The anode captures the electrons produced by the
bacteria as they break down the sewage.  Unfortunately this coating is made
out of gold but they say iron may work as well with different bacteria in
the tanks.

http://inhabitat.com/2010/07/23/nanotechnology-makes-poop-power-20-times-more-efficient/

Lindsy Iglesias
UF - Env Sci and Sustainability