Solar device transforms used tires to help purify water so that it’s drinkable

In a world where access to clean drinking water is a luxury for many, the groundbreaking innovation developed by scientists at Dalhousie University in Canada is a game-changer. Their floating solar still device offers hope to millions facing water scarcity worldwide, even in the most remote areas.

The device harnesses the power of the sun to purify seawater through a process that utilizes plasmonic nanomaterials to capture and convert light into heat. This innovative design addresses long-standing challenges in water desalination by minimizing thermal losses, preventing salt buildup, and ensuring durability in harsh maritime conditions.

Operating through a simple yet effective process, the floating solar still draws ocean water up to its surface through a wicking system. The water is then evaporated by solar-heated plasmonic materials, leaving salt behind. The purified water vapor recondenses on a clear plastic dome above the device, and is collected for easy access in a sealed bag. Real-world tests have shown that the device can produce up to 0.97 gallons of clean water daily, setting a new record for passive floating solar stills.

What sets this device apart is its use of upcycled materials, particularly carbon waste from used tires. By repurposing this waste through pyrolysis, the team has created a cost-effective and sustainable solution for water purification. The device not only provides affordable water desalination, but also generates a small amount of thermoelectricity, potentially powering onboard water quality sensors.

Looking ahead, the team plans to conduct further testing in South Asia with the goal of making the device available worldwide. Dr. Mita Dasog envisions the device as a lifeline for communities displaced by war or climate change, highlighting its potential to address pressing global issues.

As we navigate the challenges of water security, innovations like the plasmonic solar still offer a beacon of hope. By combining cutting-edge science with sustainable materials, the researchers at Dalhousie University are paving the way for a future that is both equitable and resourceful. This device not only makes clean drinking water accessible, but also showcases the power of renewable energy sources in addressing critical global needs.