Black soldier fly larvae processing of organic waste
Feed 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.
Start small
Partner with one market stall cluster, canteen or brewery producing 20 to 100 kg a day of clean, separated organic waste. Build a small shaded unit (a few plastic crates or concrete bays, a mating cage and egg traps) using Eawag's free step-by-step guide, for a few hundred dollars. Two or three people can run it in about an hour a day. Run 2 to 3 two-week cycles weighing waste in, larvae out and residue out, and test-feed larvae to a neighbour's chickens or fish before scaling.
The problem
Dumped or landfilled organic waste releases methane, attracts pests and fills disposal sites, while animal and fish feed often depends on imported soy and fishmeal. Larvae processing diverts the waste and turns it into local feed and soil amendment.
Where it fits
Thrives in warm climates or heated facilities with a steady supply of clean, source-separated organic waste (wholesale markets, supermarkets, breweries, bakeries, agro-processors) and local buyers for larvae (fish, poultry and pig farmers). Needs basic fly-colony skills and good separation at source; municipal partnerships help. Proven at a 2 tonnes a day municipal pilot in Sidoarjo/Surabaya, Indonesia, and about 30 tonnes a day commercially in Nairobi, Kenya.
The principle underneath
A fast-growing decomposer converts low-value waste into high-value protein and fat in about two weeks, shrinking the waste and turning a disposal cost into feed revenue. It works where the waste stream is clean and steady and nearby farms buy the larvae: value comes from closing a local loop (waste to feed to food), not from scale alone.
A pattern in nature
Wild black soldier fly larvae colonise rotting fruit, manure and carrion, breaking organic matter down quickly and becoming food for birds and fish.
Who to call
Eawag/Sandec (Christian Zurbrügg, Stefan Diener, Bram Dortmans) · Surabaya City Waste Management Department · Pro-BSF Indonesia · Waste4Change (Indonesia) · Insectipro (Nairobi) · SLU Uppsala, Cecilia Lalander's group · icipe insects for food and feed programme (Kenya)
Watch out for
Mixed or contaminated waste (plastics, heavy metals, pathogens) ruins larvae quality and may breach feed rules, so check local animal-feed law first. Scaling faster than reliable waste supply and larvae sales. Colony crashes from heat, cold or poor breeding conditions. Residue handling and electricity can wipe out climate gains. Citrus peel and similar feedstocks convert poorly. Cheap conventional feed means larvae sales alone may not cover costs without gate fees.
Where it comes from
Black soldier fly (Hermetia illucens) bioconversion grew from entomology and waste research. Eawag/Sandec developed the low-tech method for low- and middle-income cities with Indonesian universities and city governments under the SECO-funded FORWARD project (2013 to 2020), and published an open guide in English, Indonesian and Chinese. Open to use; credit Eawag/Sandec when adapting their manual.
Where it's worked
Puspa Agro wholesale market, Sidoarjo / Surabaya, East Java, Indonesia · 2013 to 2020 (FORWARD project), handed to a private operator July 2018
Pilot facility treated 2 tonnes of market waste a day, turning larvae into fish and poultry feed and residue into compost; now supporting Surabaya to set up units at city transfer stations.
DocumentedSource
Surabaya pilot facility, Indonesia (life cycle assessment) · Published 2019
Global warming impact just under 50 kg CO2-eq per tonne of wet biowaste versus over 100 kg for composting; direct emissions about 47 times lower (Mertenat, Diener & Zurbrügg, Waste Management 84).
Peer reviewedSource
Nairobi, Kenya (Insectipro) · Started late 2019, reported April 2021
Processes about 30 tonnes of organic waste a day from supermarkets, bakers, farmers and brewers, producing about 2 tonnes of dried larvae a day for fish, chicken and cattle feed plus fertiliser residue.
DocumentedSource
Cape Town, South Africa (AgriProtein · failure case) · 2010 pilot to administration February 2021
Despite raising USD 105 million, collapsed from overexpansion, high costs, COVID-19 disruption to waste supply and cheaper competing feed; assets sold for USD 10 million in June 2021.
DocumentedSource
Where it failed
AgriProtein (South Africa) raised USD 105 million, aimed for 100 factories, and went into administration in February 2021 after overexpansion, a USD 38.9 million loss in 2019, COVID-19 disruption to feedstock and competition from cheaper soy and fishmeal. Not all wastes suit larvae: trials found orange peel converts poorly (6% or less). At the Surabaya pilot, residue post-treatment made up 69% of the facility's global warming impact and electricity up to 55%. Without well-separated waste and paying larvae buyers the economics struggle.
Related Fruit
- TreeCommunity-scale composting hubNeighbours pool food scraps at a shared local site that turns them into compost for gardens, street trees and farms, keeping organics out of landfill.
- 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.