Source: CCTV2
Application of light modulation to control MIB-producing algae in Shanghai water sources
Qingcaosha Reservoir is a newly built water source reservoir in Shanghai, with a water supply scale of 5 million cubic meters per day, serving approximately 18 million urban residents in Shanghai. Since its construction, seasonal MIB (2-methylisoborneol) issues have been present. Based on years of cooperation and research with Shanghai Chengtou Original Water Limited Company, the algae species in the reservoir and their light thresholds have been determined, and it has been clarified that the shallow water area in the north of the reservoir is a high-risk area for algae production. Based on this, it was proposed to increase the flow of water diverted from the Yangtze River and the reservoir’s northern drainage gate to the reservoir, causing an increase in turbidity in high-risk areas and a decrease in underwater light, thereby inhibiting the growth of algae. Since 2020, the use of the natural flow of the river and reservoir level difference to increase the flow of water diversion has achieved a reduction of over 80% in odor-causing substances, effectively solving the odor problem that has plagued the reservoir for many years.
It’s important to note that the specific implementation of control methods may vary depending on the characteristics of each water source. Therefore, it is necessary to conduct a detailed analysis of the ecological niche of MIB-producing algae and the water source conditions before applying any control strategy. Additionally, continuous monitoring and research are essential to optimize and adapt control methods based on the changing dynamics of MIB-producing algae populations and environmental conditions.