Students at a South Korean university can earn a digital currency called Ggool when they use the toilet. Their excrement is turned into renewable energy to power the building.
Professor Cho Jae-weon at the Ulsan National Institute of Science and Technology designed an eco-friendly toilet called BeeVi—a portmanteau of bee and vision. The toilet connects to a lab that uses excrement to produce biogas and manure. It powers devices in the building such as a gas stove and a boiler.
“If we think out of the box, faeces has precious value to make energy and manure. I have put this value into ecological circulation,” Cho told Reuters. An average person’s daily toilet habit can provide enough energy to power a car for three-quarters of a mile, he said.
Excrement earns students 10 Ggool per day, regardless of how much they…contribute. Ggool, which means honey in Korean, can only be used at an on-campus market to buy everyday goods. Students scan a QR code to pay in Ggool.
In a study publishe
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