Eutrophication is a kind of water pollution caused by too much nutrient content of plants, such as nitrogen and phosphorus. Under natural conditions, along with the continuous deposition and deposition of river entrainment and alluvial debris at the bottom of the lake, the lake will transform from plain nutrition lake to eutrophic lake, and then become swamps and land, which is a very slow process. But because of human activities, a large number of industrial wastewater and domestic sewage and agricultural runoff in the plant nutrients discharged into lakes, reservoirs, estuaries and bays, slow flow water, especially the aquatic algae blooms, the number of species biomass change, destruction of the ecological balance of water.
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