Tanzania is scaling up the use of black soldier fly (Hermetia illucens) larvae to process organic waste, a strategy aimed at curbing greenhouse gas emissions in cities like Dar es Salaam while providing a low-cost, high-protein alternative to traditional livestock feed. According to local government and research initiatives, these larvae can reduce biological waste mass by 50 to 70% within a three-week cycle, offering a circular economy solution to the 4,600 to 6,000 tons of waste generated daily in the nation’s largest city.
Scaling Biological Waste Management in Tanzanian Cities
Urban centers in Tanzania face mounting pressure from uncollected waste, 50 to 70 % of which consists of organic matter like food scraps and produce. When left to rot in overcrowded landfills, this waste releases significant amounts of methane. To combat this, the Tanzanian government, via the National Commission for Science and Technology, has launched pilot projects in Dar es Salaam and Babati.
These facilities collect up to seven tons of market waste weekly. The process is straightforward: organic waste is shredded and fed to larvae in controlled environments. Because adult black soldier flies lack mouthparts and do not sting, they do not act as disease vectors, distinguishing them from common houseflies or mosquitoes.
Did you know?
Black soldier fly larvae reach their peak nutritional value within 14 to 21 days. During this window, they can contain up to 45% protein and high levels of healthy fats, making them a potent substitute for expensive soy or fishmeal in animal diets.
Economic Benefits for Local Agriculture
Transitioning from traditional feed to insect-based alternatives offers significant financial relief for Tanzanian farmers. Dr. Ester Msuja, an aquaculture researcher, stated to The Citizen that the high protein content of the larvae is ideal for poultry and fish farming. By utilizing locally produced feed, farmers can reduce their reliance on imported, costly ingredients by 40–50 %, directly improving their competitive edge and regional food security.
Beyond feed, the process yields a secondary product: organic fertilizer. The waste residue left behind by the larvae serves as a nutrient-rich soil amendment. This helps restore degraded Tanzanian soil without the need for chemical fertilizers, creating a “waste-to-wealth” loop that supports small-scale enterprises and backyard farms.
Overcoming Barriers to Widespread Adoption
Despite the environmental and economic upside, the shift to insect-based agriculture faces hurdles. Babati municipal director Shaban Mpendu notes that the project is as much about job creation—spanning waste collection, larvae breeding, and feed manufacturing—as it is about sanitation. However, several operational challenges remain:
- Public Perception: A “psychological barrier” exists among some consumers and farmers regarding the use of insects in the food chain, necessitating ongoing public education.
- Waste Sorting: Larvae cannot digest inorganic materials like plastic or glass. Efficient processing requires strict waste segregation at the source.
- Climate Control: While Tanzania’s climate is generally favorable, larvae require a stable temperature of 27–30 °C. Seasonal shifts in humidity and heat must be carefully managed to maintain production levels.
Similar models have already seen success elsewhere in East Africa. In Nairobi, Kenya, the social enterprise TakaTaka Solutions manages over 80% of its collected waste by repurposing food scraps into high-quality compost, using black soldier fly larvae as a primary biological tool.
Frequently Asked Questions
- Why are black soldier flies used instead of other insects?
- They are highly efficient at consuming large volumes of organic waste quickly and do not bite or transmit diseases, making them safe for urban environments.
- Can this method eliminate the need for landfills?
- It significantly reduces the volume of organic waste, but it cannot process inorganic items like plastic, glass, or metals, which still require traditional disposal or recycling methods.
- Is the feed safe for poultry and fish?
- Yes, researchers like Dr. Ester Msuja have identified the larvae as a high-protein, nutrient-dense feed source that supports healthy growth in both poultry and aquaculture stocks.
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