Min Geum-nan walks towards a metal bin beneath her apartment block in Gangdong district, eastern Seoul carrying a small bag of vegetable peelings. She taps her resident card on the reader, the lid swings open, she empties the contents and scans again and a digital screen flashes: 0.5kg.<\/p>\n
\u201cYou have no choice but to pay attention because you can see exactly what you\u2019re wasting,\u201d says Min, who has lived in the complex for 15 years and watched the system arrive in 2020.<\/p>\n
Her routine is part of the dramatic national shift<\/a> that has taken place over 20 years in South Korea, which recycled 96.8% of its 4.81 million tonnes of food waste in 2023, according to the ministry of climate, energy and environment \u2013 a transformation achieved through strict disposal rules, dedicated processing infrastructure and, increasingly, the use of radio frequency identification (RFID) bins that track waste down to the gram.<\/p>\n Food waste represents a major global climate challenge. More thana billion tonnes of food are thrown away<\/a> each year worldwide, generating as much as 10% of global greenhouse gas emissions. Many countries still send the bulk of it to landfill.<\/p>\n South Korea, however, has been grappling with its waste issue for far longer than most countries after its main landfills reached capacity in the early 1990s. The crisis prompted big overhaul of the system and a nationwide pay-as-you-throw scheme in 1995. Residents were required to buy official rubbish bags, which reduced waste but also produced an unexpected issue: once recyclables such as paper were separated out, food scraps were left sitting wet in general waste, worsening odour problems.<\/p>\n Min Geum-nan uses an RFID bin at her apartment block in Seoul Photograph: Raphael Rashid\/The Guardian<\/p>\n The practice of sending food to landfill was banned altogether in 2005, and mandatory separation imposed. Collection methods varied in the early years, but standardisation accelerated after 2013 when the ocean dumping of leachate \u2013 the liquid from food waste processing \u2013 was banned, forcing it to be processed on land. Most areas used prepaid yellow bags, which encouraged frugality but created inconveniences: bags filled slowly, especially for small households, and residents disliked storing smelly waste during humid summers.<\/p>\n 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 \u2013 130 won (about 7p) a kilo in Seoul \u2013 is automatically added to monthly maintenance bills.<\/p>\n For Min, the system changed behaviour at home. Every household has its own method for squeezing out moisture, she says. \u201cIf you don\u2019t remove water, it gets expensive. People press it, drain it and even use strainers. You learn your own tricks.\u201d Being able to dispose of small amounts several times a day also means she no longer worries about smells or flies. \u201cIt\u2019s just more convenient,\u201d she says. \u201cI can come here anytime.\u201d<\/p>\n 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\u2019s 229 municipalities. The shift has produced measurable results: since citywide implementation began in 2013, Seoul\u2019s food waste has fallen by 23.9% in a decade, from 3,181 tonnes a day to 2,419.<\/p>\n Studies of individual complexes show even steeper drops. Research across five Seoul apartment blocks found average reductions of 51% once residents could see \u2013 and pay for \u2013 the exact weight of what they threw away. In Siheung, a city south of Seoul, officials report a 41% cut across buildings that have adopted the technology.<\/p>\n From the bins, the waste \u2013 which amounts to about 300 tonnes a day from East Seoul \u2013 is taken to the Gangdong district resource circulation centre, where the processing machinery is built underground to minimise odour complaints. Incoming waste is shredded, and foreign materials such as metal fragments or onion mesh bags extracted before the waste moves deeper into the system.<\/p>\n The food waste processing facility in Seoul\u2019s Gangdong is located underground Photograph: Raphael Rashid\/The Guardian<\/p>\n It is then pressed to extract water, and the separated liquid feeds into anaerobic digesters. The resulting biogas powers the facility\u2019s drying process and odour control systems. The remaining solids \u2013 about 10% of the original volume \u2013 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.<\/p>\n It has an impact in people\u2019s kitchens too. For many families, Min says, the digital display above the bin has made portion control part of daily life. \u201cIf the family leaves food, I make less next time. You start thinking differently.\u201d Cultural norms and regulations reinforce the habit, and community bulletin boards regularly remind residents of sorting rules. \u201cPeople here are used to doing things properly,\u201d she says.<\/p>\n Despite its success, the programme faces several challenges. Central government funding for installation ended in 2014, which means local authorities must finance any new machines themselves. Smaller or poorer municipalities have struggled to keep up, and several have reported delays or slower uptake because of budget constraints<\/a>. Earlier generations of machines have also suffered from corrosion<\/a> from the high salt content of Korean food, adding to replacement and maintenance costs.<\/p>\n