Turning Mango Waste into Value: A New Era of Sustainable Waste Management

Turning Mango Waste into Value: A New Era of Sustainable Waste Management

Turning Mango Waste into Value: A New Era of Sustainable Waste Management

In many homes across Kenya and across the tropics, mangoes are among the most loved fruits, and their season is eagerly celebrated. Markets stack them in bright pyramids, children run around with sticky fingers and families slice them open for juice, smoothies, or simply enjoy them fresh under the sun. But once the juicy flesh is eaten, what remains? The seed and the fruit residue. Hard, fibrous and seemingly useless, mango seeds and processing residues are often discarded without a second thought. Yet these by-products, rich in starch, fibers and other natural biopolymers, accumulate in heaps at markets and processing sites, where they are largely treated as waste. With limited systems in place to repurpose them, they add to growing waste management challenges, increasing pressure on landfills and contributing to environmental degradation.

For Nelson Barasa, a PhD student at the University of Nairobi and a Junior Research Fellow in materials research under the GeckoCIR Project, those heaps of discarded seeds and residues tell a different story.

“My inspiration is to turn waste into a value-added product that could potentially contribute to addressing the twin challenges of waste management and the depletion of raw resources,” he explains.

From Waste to Wealth: Why rely only on trees when agro-industrial waste can be transformed into strong, sustainable boards?

This question inspired Nelson to rethink how waste is viewed not as a by-product to discard, but as a resource with untapped potential. At a time when demand for engineered wood continues to rise, he recognised a clear gap in the industry and saw an opportunity to offer a more sustainable solution.

Nelson therefore embarked on an innovative study to explore how agro-industrial food processing waste could be converted into sustainable composite materials for P1/P2 particleboard applications. His research was conducted in partnership with Premier Foods Limited (PFL), an IPS agroindustry project company known for upholding high quality standards across its entire value chain. PFL provided a strong foundation for advancing this practical, eco-friendly alternative for everyday construction and furniture use.

Journey of Transformation: Inside the Making of Mango-Based Composites

What was once discarded, the mango seed coats become the starting point of something far greater. Instead of being treated as waste, they were carefully collected, sorted and prepared for a new purpose. Step by step, the science begins. The fibres and natural starch hidden within the seed coats consisting of natural ingredients capable of forming a strong binding material are extracted. These elements are then blended, pressed and shaped into boards. At every stage, the material is tested and refined, ensuring it meets industry standards for strength, durability and performance.

Slowly, the agricultural waste takes on a new identity. What began as residue is transformed into engineered composite boards suitable for construction and furniture applications.

Nelson’s innovation needs collaboration to grow.

“For me, this is about changing perspective. Waste is only waste if we fail to see its potential. When we design with circularity in mind, we are not just creating new materials we are creating a new mindset for industry.” he explains. Imagine a centralised circular hub where different food processors bring their seasonal waste together. In these shared spaces, residues can be combined, processed and transformed using common infrastructure thereby turning individual waste streams into collective opportunity.

Of course, the journey from research to reality comes with challenges but “If we can integrate agro waste back into production systems while reducing environmental pressure and strengthening local value chains then that’s the direction sustainable industries should take.” says, Isaac Nyonje, IPS Environment & Social Officer.

“For PFL, Mango processing waste has been a key challenge in achieving our zero-waste-to-landfill target.” Ruth Kioko, Sustainability Champion- PFL notes, “However, by upcycling what was once discarded into useful composite products, we are not only reducing landfill waste but also moving closer to fully achieving our zero-waste ambition. At the same time, these alternative materials reduce reliance on timber, helping to curb deforestation and protect vital ecosystems.” Ruth adds.

The bigger question is no longer whether agro waste can replace conventional materials. The real question is, how quickly we are willing to adopt solutions that bring waste back into the system and build a future where sustainability is not an alternative.

Michelle Muriithi & Metrine Papa