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Kenyan farmer Victor Kyalo’s
chickens have doubled the number of eggs they are laying. The reason: Human
He is feeding them food from a
Nairobi-based organics recycling company. Sanergy harvests waste from toilets
it operates in a franchise network in Nairobi’s sprawling slums and feeds it to
fly larvae, which become high-quality animal feed.
Kyalo says his customers have
noticed the difference in the past three weeks: yellower yolks and larger eggs.
“Before we were getting like five
trays (of eggs) per day, but now we are getting 10,” Kyalo said. “It’s kind of
perfect for me.”
As the world looks to feed 10
billion mouths by 2050, businesses harvesting insects — either for human
consumption or as animal feed — are growing. They promote themselves as a
greener alternative to traditional feed such as soybeans, whose cultivation can
lead to deforestation and the overuse of farm chemicals.
Fast food giant McDonald’s and U.S.
agricultural powerhouse Cargill Inc are among many large companies studying
using insects for chicken feed to reduce reliance on soy protein in the $400
billion-a-year animal feed business.
By 2023 the global edible insect
market could triple to $1.2 billion from current levels, market research firm
Meticulous Research said last year.
In developing countries like Kenya,
where the World Bank says nearly two-thirds of urbanites live in slums, feeding
waste to fly larvae could solve both sanitation and nutrition problems.
Faeces from more than two-thirds of
Nairobi’s inhabitants go untreated because there are not enough toilets. Many
others are not cleaned out regularly, Nairobi City Water and Sewerage Company
During the rains, they often
overflow, polluting local waterways. That can make workers ill. Days off slow
Kenya’s economy by around 1% annually, its Health Ministry said.
LOO TO FOOD
David Auerbach co-founded Sanergy
eight years ago to deal with sanitation. The waste management franchise
provides more than 2,500 toilets to 100,000 people daily.
Lilian Mbusia runs one of Sanergy’s
franchises, charging residents of Mukuru Kwa Ruben slum in the south of the
city 5 Kenyan shillings (5 U.S. cents) to use her blue “Fresh Life” toilets.
Nestled beneath her squat-toilets
are small blue barrels that, once full, are sealed and taken to an organics
recycling factory in Machakos County, a bumpy 40-minute drive outside the city.
Beds of writhing black soldier fly
larvae feast on a mix of excrement and food waste from hotels and agri-businesses.
That produces two products for
farmers: fertilizer and animal feed.
In 10 days the larvae munch their
way through 70% of the waste, leaving behind a manure laden with nitrogen and
calcium, which becomes organic fertilizer.
Once the recycling plant is expanded
later this year, Auerbach said it will provide 400 tonnes of fertilizer. Larvae
production will ratchet up from 7 tonnes to 300 tonnes per month.
“Right now we are receiving equity
debt, and grant investment to scale up operations,” Auerbach said. “We’re on
track for profitability by the end of 2020.”
The plump white larvae are boiled in
hot water to kill off pathogens, Michael Lwoyelo, managing director of Sanergy,
The larvae are then sold to animal
feed millers, who grind them into powder mixed with other ingredients to create
a balanced diet for poultry, pigs and fish.
Frederick Wangombe, an animal
nutritionist at Unifeed, a Kenyan animal feed miller that uses Sanergy’s black
soldier fly product, envisages it replacing fish meal from Lake Victoria, which
can contain sand and other impurities, or expensive soy beans from Zambia.
“The egg farmer doesn’t want to know what’s in
the feed, they want to know the performance,” he said.