Ulsan National Institute of Science and Technology (UNIST) has shown that a person's poop can generate income that can buy books, fruits or coffee.
Cho Jae-weon, an urban and environmental engineering professor at UNIST has devised a virtual currency called Ggool, which means honey in Korean. Each person using the eco-friendly toilet earns 10 Ggool a day, according to Reuters.
Cho designed an eco-friendly toilet connected to a laboratory that uses excrement to produce biogas and manure.
The BeeVi toilet—a portmanteau of the words bee and vision—uses a vacuum pump to send feces into an underground tank, reducing water use. There, microorganisms break down the waste to methane, which becomes a source of energy for the building, powering a gas stove, hot-water boiler and solid oxide fuel cell.
“If we think out of the box, feces has precious value to make energy and manure. I have put this value into ecological circulation,” Cho told Reuters.
Two women browse items at the Ggool market in the Ulsan National Institute of Science and Technology campus in South Korea | Reuters
An average person defecates about 500g a day, which can be converted to 50 liters of methane gas, the environmental engineer said. This gas can generate 0.5kWh of electricity or be used to drive a car for about 1.2km (0.75 miles). Thus when you use the toilet, the human waste is being used to help power a building and you earn the money. The students can pick up the products they want at a shop and scan a QR code to pay with Ggool.
“I had only ever thought that feces are dirty, but now it is a treasure of great value to me,” postgraduate student Heo Hui-jin said at the Ggool market. “I even talk about feces during mealtimes to think about buying any book I want"
