|Blue-green algae have been reported recently on the surface of Hoàn Kiếm Lake. – VNA/VNS Photo Mạnh Khánh|Viet Nam News
HÀ NỘI — Blue-green algae have been reported on the surface of Hoàn Kiếm (Returned Sword) Lake in the past few days.
The algae have appeared on one section of the lake, mostly around the side opposite to house numbers 47-49 on Đinh Tiên Hoàng Street.
Dương Đức Tiến, a leading algae expert, told the Vietnam News Agency that blue-green algae, which grows from a type of bacteria called Cyanobacteria, is poisonous. These algae bloom due to many factors, including weather changes that can lead the algae to multiply.
The algae release carbon dioxide, negating the presence of oxygen and threatening marine organisms. Tiến said the algae needed to be collected urgently.
Bùi Ngọc Uyên, deputy head of the External Relations and Communication Division of Hà Nội Sewage and Drainage One Member Limited Company, said after being dredged, most of the lakes in the city recorded a high level of nitrogen and phosphorus, leading to the bloom of planktons such as algae and mosses.
The company and experts are closely monitoring the floating algae for further assessment.
The company, meanwhile, has mobilised cleaners to fish out the algae, he said.
This month, the company has released 22 tanks of original green algae into the lake to revive its unique green colour after dredging. — VNS