China tested nanobubbles across a 3,300-square-metre section of Taihu Lake; within 20 days...

China's Taihu Lake sees improved water quality over past 10 years A field trial using a two-stage nanobubble treatment system across a 3,300-square-metre section of Taihu Lake in eastern China reduced a key measure of toxic cyanobacteria by nearly 90 per cent within 20 days. Published in the journal Environmental Research and indexed on PubMed, the peer-reviewed study describes an in-situ restoration project aimed at controlling harmful algal blooms and improving water clarity in one of China's largest freshwater lakes. The treatment combined hydrodynamic cavitation with ozone nanobubbles in a semi-enclosed test area. Water quality monitoring showed that chlorophyll-a, a key indicator of cyanobacteria levels, fell by 89.8 per cent during the three-week trial. Severe cyanobacterial blooms have affected Taihu Lake for decades. Agricultural runoff, industrial discharge and urban wastewater across the Yangtze River Delta have helped drive the problem. These blooms reduce dissolved oxygen, release toxic microcystins and threaten drinking water supplies for millions of people in Jiangsu and Zhejiang provinces.Dual-stage physical and chemical treatmentTraditional methods of treating pollu...