Sewage-cleaning device produces electricity, too

Small units that purify household sewage could provide a source of electricity for urban and remote communities in the developing world, according to researchers. The units would be populated with Shewanella oneidensis, one of several types of bacteria that can break down organic matter in sewage, producing electrons and protons. If the sewage is placed between electrodes with the bacteria present, this process can be harnessed to generate an electrical current.
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