ULSAN, South Korea — Researchers in South Korea have developed a toilet they say turns human waste into energy.
It works like this: A person uses the toilet, then vacuum suction whisks waste away to a microbial reactor. The micro-organisms digest it and release bio-gas that can be used as fuel.
The process also releases carbon dioxide, which can help grow green algae that can be refined into bio-diesel.
The toilets only use about a pint of water per flush. They are being installed at South Korea's Ulsan National Institute of Science and Technology.
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Toilet users get tokens that are accepted at shops on campus as payment for the energy they have produced.