Researchers in South Korea developed a solar-powered autonomous surface robot designed to eliminate harmful cyanobacteria blooms in water reservoirs [1].
The technology addresses a critical threat to drinking-water quality in the Chungcheong region. As extreme heat raises water temperatures, the resulting algal growth can contaminate essential water supplies, necessitating low-cost and low-labor removal solutions [1].
The project was led by senior researcher Oh Hyung-seok at the Korea Institute of Science and Technology (KIST) [1]. The robot operates by utilizing a cobalt single-atom catalyst to generate hydrogen peroxide, which acts as the agent to remove the harmful algae [1].
This development follows severe environmental challenges at Daecheong Lake, a primary water-supply reservoir [1]. During an extreme heat wave in 2024, water temperatures rose to approximately 30 °C [1]. This temperature spike triggered the rapid expansion of cyanobacteria, covering the reservoir in a thick layer of green algae [1].
Oh said the process relies on electrochemical reactions involving oxidation and reduction electrodes [1]. By integrating solar power, the robot can operate autonomously on the water's surface without requiring constant manual intervention or external power grids [1].
The system is designed to be more sustainable than traditional chemical treatments. By producing the cleaning agent on-site via the catalyst, the robot reduces the need for transporting and dumping large quantities of chemicals into the ecosystem [1].
“The robot operates by utilizing a cobalt single-atom catalyst to generate hydrogen peroxide.”
The integration of autonomous robotics with on-site chemical generation represents a shift toward 'active' environmental remediation. By utilizing solar energy and single-atom catalysts, the KIST team is attempting to decouple water purification from heavy industrial labor and chemical logistics, providing a scalable model for other regions facing rising water temperatures due to climate change.
