Experts say Enteromorpha Qingdao may exist offshore for a long time. In recent days, the coastal waters of Qingdao, Shandong Province have been invaded by Enteromorpha prolifera. According to the monitoring of Beihai Forecast Center of the Ministry of Natural Resources, the number of Enteromorpha prolifera in Qingdao this year is significantly higher than that of last year, reaching the historical maximum. In this regard, Qingdao launched the project of "Emergency Disposal for Salvaging Enteromorpha prolifera in Coastal Waters", and established a pre-salvage line for Enteromorpha prolifera at sea to curb the spread of Enteromorpha prolifera, minimize the front-end reduction, and ease the pressure of coastal management.

The latest data shows that the local emergency plan has been launched, and currently about 240,000 tons of Enteromorpha are salvaged. After comprehensive control and effective disposal, Qingdao has minimized the impact of Enteromorpha disaster.

Causes of Enteromorpha prolifera outbreak in Qingdao;

At present, the core of sewage treatment in most urban sewage treatment plants is secondary treatment: aeration oxidation, which decomposes organic matter in sewage through excessive reproduction of aerobic flora;

Thus, a large number of malodorous colloidal sludge with aerobic bacteria as the main body and a large number of inorganic salts (mainly inorganic nitrogen and phosphorus) are produced. Inorganic nitrogen and phosphorus are dissolved in water, and after filtration, the effluent is clean water that meets the COD standard. Water is a fungal process;

The repeated cycle of algae process can maintain the ecological balance of water body. Because of the fungal process in the sewage treatment plant, it is inevitable that the reclaimed water discharged will produce algae pollution in theory.

What kind of algae disaster breaks out is related to many factors, such as seawater temperature, nutrient concentration, algae competitiveness and so on. For example, Fong et al. found that phytoplankton is the dominant competitor at low nutrient concentration; At high nutrient concentration, attached macroalgae and flaky cyanobacteria are dominant competitors.