Nanobubble technology tested for cyanobacteria reduction in Taihu Lake

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Researchers conducted a 20-day field trial in a 3,300-square-metre section of Taihu Lake, China, using a two-stage system of hydrodynamic cavitation and ozone nanobubbles to address toxic cyanobacteria. The study, published in the journal Environmental Research, reported that the treatment reduced chlorophyll-a levels by 89.8 percent and decreased chemical pollutants like ammonia nitrogen. This initiative addressed decades of water quality issues in Taihu Lake, which provides drinking water for millions and has been plagued by agricultural and industrial runoff. The technology was tested as a high-tech, chemical-free alternative to traditional remediation methods such as copper sulfate application or mechanical algae removal.

Consequences

If the nanobubble technology proves effective at scale, it could become a standard tool for regional authorities in Jiangsu and Zhejiang provinces to manage seasonal algal blooms in the 2,200-square-kilometre lake. Successful implementation may lead to improved drinking water security and support the natural recovery of submerged aquatic plants by increasing dissolved oxygen levels and water transparency.

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