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From Scientific American:
A new microbial fuel cell creates energy during wastewater treatment and also vastly reduces the amount of sludge produced. Israel-based company, Emefcy, named as a play on the acronym for microbial fuel cell (MFC), starts with the same principle as most wastewater treatment--water is aerated so bacteria in the liquid break down organic material in a closed series of containers known as a bioreactor.
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