The design of the fuel cell meant that the bacteria, which used the DDGS for growth, were physically separated from their oxygen supply. This meant that the bacteria were forced into sending electrons around a circuit leading to a supply of oxygen. By tapping into this electron flow, electricity could be generated from the waste.
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[source: http://www.buildings.com/ArticleDetails/tabid/3334/ArticleID/14636/Default.aspx]
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