Monday, October 3

"Orange peels and avocado skins are 16-year-old's brilliant, drought-fighting solution"

By Robin Shreeves
October 3, 2016

Kiara Nirghin created an inexpensive way to help soil retain water

I was all smiles this morning reading about Kiara Nirghin, a 16-year-old from Johannesburg, South Africa, who won the grand prize at the 2016 Google Science Fair for coming up with a way to use orange peels and avocado skins to help retain water in soil. 

South Africa is in the worst drought in more than 20 years. The teen believes "a critical solution to long-term water needs is a special material that can hold hundreds of times its weight in water while stored within soil."

She came up with her mixture to replace current soil additives, which are manmade and filled with harmful chemicals. These non-biodegradable solutions, known as superabsorbent polymers or SAPs, are macromolecules that absorb water and release it slowly to the surrounding soil. They work, but they're out of reach financially for local farmers. In contrast, Kiara's solution is biodegradable and affordable.


In her "About me" section on Google's science fair site, Kiara says she loves "the captivating subjects of chemistry and physics in school." She also believes "that food and chemistry are undoubtedly linked in the intertwined science web. I love molecular gastronomy and the application of scientific principles in food creation."

This molecular gastronomy/chemistry/physics-loving girl used waste products found in the juice manufacturing industry to create her orange peel mixture, which can absorb 76.1 percent of water, an amount she says is "significantly greater" the absorption of acrylic SAPs, starch SAPs and pectin SAPs. 

Additionally, the current commercial SAP costs about $2,000 to $3,000 per metric ton. Kiara says her mixture can retail for $30 to $60 per metric ton.

She thinks her concoction could increase food security by 73 percent in drought disaster areas.

That's a brilliant use of food scraps, created by a brilliant and inquisitive young mind.



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