By Jules Bernstein – UC Riverside
Black soldier flies have long been used by cities and industry to break down food scraps and agricultural waste. Compared to industrial-scale operations, which require significant infrastructure and staffing, the DIY system is far more affordable and accessible.
“A commercial facility might process tons of food waste a day, but that comes with big capital and labor costs,” says Kerry Mauck, a University of California, Riverside entomologist who helped design and test the system.
“Our system can be built with off-the-shelf materials, maintained by one person, and still produce useful products that can help grow more food.”
A paper coauthored by Mauck describing the bioreactor system and its effectiveness as a food transformation tool has been published in the journal Waste Management.
“This setup lets you recycle food waste right where it’s produced, either on a farm, in a greenhouse, or even at a large residence,” Mauck says. “We ran ours using food waste from a campus dining hall.”
The research team found that with basic oversight, the system becomes remarkably stable, producing about a pound of larvae per square yard every day.
Black soldier fly larvae are sought after as protein-rich feed for poultry and fish. Their manure, called frass, is a valuable soil amendment. Unlike house flies, which transmit disease and are a nuisance, black soldier flies are harmless and uninterested in human environments.
The bioreactor’s primary output is frass, which is produced in even greater quantities than the larvae themselves. But frass offers more than nutrients. Insect body parts mixed in from molting stimulate natural plant defenses and improve soil microbial health.
“There’s a lot we’re still learning about how frass boosts plant immunity,” Mauck says. “We’re seeing that when insect fragments are part of the soil, it helps plants resist disease, almost like a vaccine.”
Climate control is key to keeping the bioreactor running smoothly. Researchers found that larvae need a shaded or greenhouse space that stays below 100 degrees Fahrenheit. During rearing, users occasionally add water and wood chips, and monitor basic metrics like temperature and pH, then adjust as needed.
“One of our big takeaways was that monitoring pH really matters,” Mauck says. “If the system gets too wet, anaerobic bacteria can take over, dropping the pH and harming the larvae. But small tweaks, like less water or more wood chips, can quickly bring things back into balance.”
By mimicking natural cycles where insects feed and die in soil, the bioreactor reconnects farming with the ecosystems it often disrupts. For farms seeking to reduce waste and input costs, the insect-powered solution offers both ecological and economic benefits.
“This isn’t just waste management, it’s resource creation,” Mauck says. “We’re taking what we don’t want and turning it into something we do.”
Source: UC Riverside
Original Study DOI: 10.1016/j.wasman.2025.115073
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Previously Published on futurity.org with Creative Commons License
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