Water pollution is a certain amount of sewage， waste water， all kinds of waste and other pollutants into the waters， beyond the self-purification of water bodies and the pollutant carrying capacity， resulting in water and sediment of the physical and chemical properties and biological community composition occurred adverse changes in the inherent destruction of the water ecosystem and water features， thereby reducing the water use value Water pollution caused by many factors: the body of water without proper treatment of urban domestic sewage and industrial waste water; application of chemical fertilizers， pesticides and urban pollutants on the ground， washed by the rain，With the surface runoff into water bodies; with the atmospheric dispersion of toxic substances through gravity settling or precipitation process into the water body and so The first one is the main factor of water The 20th century， 70 years later， with the development of global industrial production and socio-economic prosperity， a large number of industrial wastewater and urban domestic wastewater discharged into water bodies， water pollution is getting These are contaminated water into the plants and animals， human body， causing harm to human pose a major threat to the survival and become human health， economic and social sustainable development， a major obstacle， prevention and treatment of water pollution is that we are nowAre most concerned about the In this paper， mainly the main source of water pollution are introduced， and which sum up the dangers of the existing water pollution treatment technology， methods learned
