Citywide source-separated food scrap collection
Every household and business separates food scraps into a dedicated bin that the city collects and turns into compost or biogas.
Start small
Run a 3 to 6 month pilot in one neighbourhood of about 500 to 1,000 households, giving each a vented caddy, compostable bags and a brown bin, with weekly or twice-weekly collection to an existing composter. Budget mainly for kits, one collection route and two or three outreach staff, and measure tonnage and contamination before scaling.
The problem
Food and other organic waste sent to landfill rots into methane and wastes nutrients. Collecting it separately at the source keeps it clean enough to become compost and biogas.
Where it fits
Thrived in dense cities with a municipal or contracted collector, a nearby composting or anaerobic digestion plant, and rules that make separation mandatory or make residual waste cost more (pay-as-you-throw, landfill bans). Simple kits (small vented kitchen caddy, compostable bags, kerbside bin) and steady public education keep contamination low.
The principle underneath
Separating at the source keeps organics clean, and mandates or price signals make separation the default, so volumes grow until collection is efficient. Pairing collection with a local treatment plant closes the loop by returning energy and soil fertility.
A pattern in nature
A forest floor, where fallen leaves and dead matter are decomposed in place and returned to the soil rather than piling up.
Who to call
Zero Waste Europe (Milan case study authors); AMSA and the City of Milan; SF Environment and Recology (San Francisco); Seoul Metropolitan Government waste department; BioCycle (US practitioner network).
Watch out for
Voluntary, opt-in schemes rarely reach the volumes that make collection affordable. Contamination from plastic bags rises without feedback and fines. Districts using different systems confuse residents, and treatment capacity must be planned alongside collection.
Where it comes from
Commercial food scrap collection in Milan dates from 1997 and San Francisco's large-city programme from 1996; Seoul introduced volume-based waste fees in 1995 and weight-based food waste fees in 2013 after a 2005 national ban on landfilling food waste. Practice is openly documented by cities and NGOs.
Where it's worked
Milan, Italy · 2012 to 2020
Door-to-door household food waste collection rolled out citywide by 2014, raising collection from 28 kg to 110 kg per person per year (2011 to 2019) and the separate collection rate from 35% to 62.6%; waste is digested into biogas and compost at Montello.
DocumentedSource
San Francisco, USA · 1996 to 2020
Food scrap collection, made mandatory in 2009, helped lift diversion from 25% in 1990 to 77% in 2008; over 1 million tons of organics had been diverted by 2011, and 99% of properties had mandatory collection by 2020.
DocumentedSource
Seoul, South Korea · 1995 to 2013 onward
Volume-based waste fees cut waste generation 40% by 2012; a weight-based, RFID-metered food waste fee from 2013 cut household food waste 7.3% in its first year and 14% overall, saving an estimated 12 billion won.
DocumentedSource
New York City, USA · 2013 to 2021
Voluntary curbside organics reached only about 1.4% diversion at $734 per ton and was suspended in 2020, a documented failure case of an opt-in design.
DocumentedSource
Where it failed
New York City's voluntary curbside organics programme diverted only about 1.4% of waste in 2019 at $734 per ton versus $216 for refuse, because low participation left trucks nearly empty, and it was suspended in 2020 budget cuts. Even in Milan, plastic bags and nappies remain the main contaminants and the digestion plant runs well below capacity.
Related Fruit
- TreeVolunteer food rescue and sharing networkVolunteers collect surplus food from shops and neighbours and share it for free through public fridges, apps or community meals.
- TreeBlack soldier fly larvae processing of organic wasteFeed separated food and market waste to black soldier fly larvae, which shrink the waste and turn it into protein for animal feed plus a compost-like residue.