The idea of harnessing flies for recycling waste while creating natural fertilizer and livestock feed is also gaining traction in cities located in Asian countries like China, Indonesia and Singapore.
Requirements to apply this process:
- A type of fly called Black Soldier, which is an insect known as Hermetia illucens. However there are also another fly species who can also be used. The decision of the type of fly will depend on the composition of the food waste.
- It is recommendable to have an estimated amount of produced food waste in order to dimension and design the facilities.
The process works this way:
The collected kitchen waste will be automatic sorted, crushed, bio-deodorized, processed into Black Soldier Fly’s food, and finally produce the larvae and frass. A city with the population of 1 million will generate about 100 tons of kitchen waste every day (more or less), including 60 tons dry matter. This can produce 20 tons of larva and 40 tons of fertilizer. The larva can be used as a high-protein feed for Citizen Farm's chickens. There are however research that investigated the feasibility of using the larva as feed for fish. See: https://journals.sagepub.com/doi/abs/10.1177/0734242X09103838?journalCo…
I want to share with all of you this amazing video of how China is working with the kitchen waste, it explains really well what i described lines above.
The same way in Singapore, they are not only applying this solution but they continue investigating how to make the process more efficient. A team in the Department of Biological Science at the National University of Singapore is exploring how they can change the black soldier fly's behavior to maximize its food waste processing potential. The aim of the project is to make the larvae efficient feeders, so that half the amount of larvae can eat the same amount of food waste in half the space.
Finally, here some more compiled research of different universities in case it wakes up your interest :)