The density of early warning blue-green algae entering the waters of Taihu Lake fell compared with the same period of previous years

Wuxi was informed on June 6th by the Wuxi Environmental Protection Bureau that since the temperature rose in May, the blue-green algae cluster has begun to appear sporadically in the waters of Taihu Lake. Up to now, monitoring of algae accumulation 13 times, the rated area of ​​34.28 square kilometers, the data have decreased compared to previous years, the overall water quality of Taihu Lake is still stable in four types of standards.

Since 2007, the environmental monitoring department of Wuxi has designated the blue-green algae warning period in Taihu Lake from April to October each year. The local blue-green algae monitoring in Taihu Lake now has advanced domestic methods, including intelligent monitoring of sensor networks, satellite remote sensing, and seaplanes, etc. 24-hour automated monitoring.

Recent monitoring results showed that, on May 3, the first time blue-green algae gathered in the waters of Taihu Lake, with an area of ​​5.03 square kilometers, and rising to 34.28 square kilometers on June 2, which was a recent nominal gathering. According to Gu Zhengfan, deputy director of the Wuxi Municipal Environmental Monitoring Center, last year, the total concentration of cyanobacteria in Taihu Lake was more than 500 square kilometers, accounting for about one quarter of the entire Taihu Lake. This year, the initial accumulation period and density of cyanobacteria have improved significantly compared with the same period of previous years, and there are many sporadic distributions. There are no large-scale algae gathering around the major water sources in Wuxi, and all the water quality has reached the standard.

The satellite remote sensing maps in recent days show that the cyanobacterial aggregation area in the Taihu Lake area changes frequently, and the once-targeted gathering is extended to the northwest outer part of the Taihu Lake, showing a long strip distribution. Wuxi’s several water intakes are located in the southeast of Taihu Lake, and no blue-green algae have been found in the naked eye.

Due to the rapid growth of algae growth habits, the environmental protection department in Wuxi will generate monitoring reports on the distribution of blue-green algae on a daily basis. These data include water quality, algae density, video capture, and satellite remote sensing maps. Gu Zhengfan introduced.

“In recent years, thanks to a series of measures such as controlling pollution, attracting water from the Yangtze River, cyanobacterial fishing, and planting clean water plants, the overall water quality of Taihu Lake has stabilized at four types of standards, and there has been no large-scale outbreak of blue-green algae. The smaller it is." Gu Zhengfan said that from July onwards, Wuxi’s environmental protection department will increase manual inspections on the coast of Taihu Lake to ensure a safe summer. (Finish)

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