土壤污染和防治(英语).ppt

Environmental pollution and prevention;Environmental pollution and prevention;First, the concept of the characteristics of the soil pollution;2 major pollutants; 1 soil pollution has hidden and lag 2 Accumulation of soil pollution 3 soil pollution irreversible 4 soil pollution refractory rational ;Second. Soil pollution reasons;1 sewage for irrigation;2 air pollution;3.Excessive application of fertilizers.;4 heavy use of pesticides;5 solid waste;6 Heavy metal elements;7 Radioactive substances contaminated soil;Third. Hazards and the status quo of the land; Currently, the uproar cancer villages. China cancer village space distribution is very uneven, in addition to the four provinces of Tibet, Qinghai, Gansu, Ningxia has not been found outside the village of cancer, are distributed in 27 provinces across the country, the number of significant differences between these provinces cancer village. Number of cancer Village in Henan Province, more than 39 is the greatest. Causes, removal of part of the formation of the unexplained cancer villages, the formation of the cancer villages remaining 90% are associated with modern industrial pollution. Such factories and mines mainly include chemical plants, printing and dyeing, paper mills, pharmaceutical plants, tanneries, alcohol plants, power plants, lime kilns, where the chemical plant caused environmental pollution lead to the the cancer villages phenomenon most common. ;Status:;Land pollution status of general characteristics:;2.Huge pollution hazard.;3.Pollution prevention foundation is weak;Fourth, the prevention of soil pollution;2.Soil pollution prevention measures;3.Soil pollution control measures; In short, according to the environmental policy of prevention first, the primary task of preventing soil pollution control and eliminate soil pollution, prevent soil pollution; contaminated soil, it is necessary to take all effective measures to remove the contaminants in the soil,improve the soil, preventing the m