Rolled Wood Turns Seawater Into Drinking Water in South Korea

Imagine solving a water crisis with something as humble as rolled-up wood and sunshine. That's exactly what researchers at Pohang University of Science and Technology (POSTECH) have achieved with a breakthrough that could transform how we think about clean water access.

Professor Jeon Sang-min and his team created cylindrical wooden evaporators that continuously produce fresh water from seawater without using any electricity. The secret lies in how they prepare the wood: slicing it into paper-thin sheets and rolling them into 40-centimeter tall cylinders.

This rolling process creates microscopic channels that act like tiny straws, pulling seawater upward through capillary action. Here's where it gets brilliant: while the water travels up, dissolved salt flows back down into the ocean, preventing the crusty buildup that has plagued solar desalination systems for years.

Under midday sun, an array of just 50 cylinders produced an astonishing 35.8 kilograms of water per square meter per hour. That ranks among the highest evaporation rates ever reported for solar-powered systems under similar conditions.

The technology doesn't clock out at sunset either. The wooden evaporators keep working after dark by absorbing heat from the surrounding air. Any salt deposits that form during the day simply dissolve overnight, meaning zero manual cleaning required.

The Ripple Effect

This innovation arrives at a critical moment. Nearly 2 billion people worldwide lack access to safe drinking water, and climate change is intensifying droughts across the globe. Traditional desalination plants cost millions to build and require massive amounts of electricity, putting them out of reach for the communities that need them most.

The POSTECH system flips that equation entirely. Wood is renewable, abundant, and cheap. Sunlight is free. There are no complex parts to break down or maintain.

For disaster-stricken areas cut off from power grids, this could mean the difference between survival and catastrophe. For remote coastal villages, it could eliminate the daily burden of searching for clean water.

The water produced meets World Health Organization standards for safe drinking water. In other words, it's not just clever science; it's genuinely drinkable, safe water created from the ocean using materials anyone can access.

Professor Jeon believes this simple wooden design demonstrates how low-cost materials can tackle one of humanity's most pressing challenges.

Clean water flowing from rolled wood and sunlight isn't just innovation; it's hope in cylindrical form.