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smart bins measuring food waste in South Korea
https://www.theguardian.com/environm...te-south-korea

RFID bins, designed to make disposal both more precise and more transparent, were introduced in the early 2010s and are now widespread across cities. The fee – 130 won (about 7p) a kilo in Seoul – is automatically added to monthly maintenance bills.

Seoul operates 27,289 RFID units, serving 81.6% of apartment residents. Overall coverage across all housing types stands at 37.9%. Nationally, 150,738 units serve 8.54 million apartment households across 186 of the country’s 229 municipalities. The shift has produced measurable results: since citywide implementation began in 2013, Seoul’s food waste has fallen by 23.9% in a decade.

From the bins, the waste is taken to resource circulation centre, where incoming waste is shredded, and foreign materials such as metal fragments or onion mesh bags extracted before the waste moves deeper into the system. It is then pressed to extract water, and the separated liquid feeds into anaerobic digesters. The resulting biogas powers the facility’s drying process and odour control systems.

The remaining solids – about 10% of the original volume – are dried, screened again for contaminants, and processed into chicken feed that is sold nationwide and even exported. National figures show that around 42% of recycled food waste becomes animal feed, 33% compost and 16% biogas.
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