Solar-Powered Desalination System Eliminates Harmful Brine, Recovers Valuable Minerals
Desalination plants worldwide have long faced a critical environmental challenge: for every liter of fresh water produced, roughly 1.5 liters of concentrated saltwater brine are generated and typically discharged back into the ocean, harming marine ecosystems. Scientists have now developed a solar-powered desalination system that addresses this problem by converting nearly all the extracted salt into a solid form rather than liquid brine.
The new technology operates passively using solar energy, making it suitable for off-grid and remote coastal communities facing water scarcity. A key innovation is its self-cleaning design, which prevents the mineral deposits that typically plague desalination membranes and reduce efficiency over time. This maintenance-free operation could significantly reduce operational costs compared to conventional systems.
Perhaps most significantly, the system is designed to capture valuable minerals dissolved in seawater during the desalination process. Lithium, in particular, is present in trace amounts in seawater, and the researchers suggest the technology could eventually be adapted for mineral recovery operations—potentially turning desalination waste into an economic resource.
The approach represents a departure from energy-intensive reverse osmosis systems common in large-scale desalination plants, though researchers note that scaling up the technology for municipal water supply would require additional engineering challenges to be addressed.