Household food scraps make up a large, costly share of residual municipal waste

The problem

Organic food waste — peelings, leftovers, plate scrapings, coffee grounds, eggshells — is one of the largest single fractions of household residual waste. The French environment agency ADEME estimates biowaste makes up roughly a third of the typical household residual bin, and France generates on the order of 28 million tonnes of biowaste per year across all sources. When food scraps go in the general (residual) bin, they are collected mixed, then trucked and incinerated or landfilled along with everything else.

This is expensive on several fronts at once:

• It is heavy and wet. Food scraps carry water, so they add disproportionate weight to every collection round and raise per-tonne haulage cost.
• It burns badly. Wet organic matter has low calorific value; incinerating it consumes energy rather than producing much, and it inflates the residual tonnage on which gate fees and treatment costs are charged.
• Separate bio-waste collection is not free either. The standard policy answer — a dedicated curbside organic bin, or neighbourhood drop-off points — solves the mixing problem but adds its own cost: extra bins, extra collection routes and vehicles, and a composting or methanisation plant to receive the material.

The regulatory backdrop (France)

This is no longer optional in France. Under the loi AGEC (anti-waste / circular-economy law of 10 February 2020), household biowaste sorting at source became mandatory from 1 January 2024: every local authority must offer residents a route to separate and valorise their biowaste, whether by proximity management (home or shared composting) or separate collection. The law sets a destination — keep biowaste out of mixed incineration and landfill — but leaves authorities to fund the means. That makes the cost of how biowaste is diverted a live, universal question for French municipalities, not a niche one.

Why source diversion matters

Every kilogram of food waste that never enters the municipal collection stream at all is the cheapest kilogram to manage: no bin, no truck, no gate fee, no treatment plant throughput. For the share of households with outdoor space and willingness, diverting biowaste at the household — before it is ever set out for collection — sidesteps the entire downstream logistics chain. ADEME accounts for animal feeding (poultry) and home composting as legitimate forms of source diversion alongside separate collection.

The constraint is that source diversion only works where households have a practical, low-effort way to consume or process scraps on site, and where enough households take part to move the aggregate tonnage. This issue is the parent for approaches that make household-level diversion practical at municipal scale.