土壤污染及防治(英语).ppt
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1、Environmental pollution and preventionSoil pollution hazards and the status quo3The concept of characteristics of the soil pollution1Soil pollution reasons24Of soil pollution prevention and control measuresFirst,the concept of the characteristics of the soil pollution What is soil pollution?Soil pol
2、lution harmful toxic substances into the soil beyond the self-purification capacity of the soil,resulting in soil physical,chemical and biological properties change,reducing crop yields and quality,the phenomenon of harm to human health.From the perspective of environmental science to define soil po
3、llution is the waste and toxic and hazardous substances into the soil over the soil self-purification capacity,destruction of the state of the natural balance of the soil system completely soil quality deterioration or recession phenomenon.2 major pollutants1.Inorganic contaminants(such as heavy met
4、als,acids,salts,etc.)2.Organic pesticides(such as fertilizers,pesticides,herbicides,etc.)3.Organic waste(such as biodegradable or degradable organic waste,etc.)4.Sludge,slag and fly ash,radioactive substances,parasites,pathogens1 soil pollution has hidden and lag2 Accumulation of soil pollution3 soi
5、l pollution irreversible4 soil pollution refractory rational 3.Characteristics of land 3.Characteristics of land contaminationcontaminationSecond.Soil pollution reasons1 sewage for irrigation2 air pollution3 excessive application of fertilizers4 heavy use of pesticides5 solid waste6 of heavy metals7
6、 radioactive material contamination of soil1 sewage for irrigation1 sewage for irrigation Sewage and industrial waste water,containing nitrogen,phosphorus,potassium and many plants need nutrients,so reasonable use of Sewage Irrigation,general stimulation effect.Sewage containing heavy metals,phenols
7、,cyanide and other toxic and hazardous substances directly used for farmland irrigation,will pollute the soil.2 air pollution2 air pollution Atmospheric pollution can be divided into two categories:gas pollution,such as sulfur dioxide,fluoride,ozone,nitrogen oxides,hydrocarbons,etc.;aerosol pollutio
8、n,such as dust,soot and other solid particles and liquid smoke,fog and other particles,they are by sedimentationor precipitation into the soil and cause pollution.3.Excessive application of fertilizers.3.Excessive application of fertilizers.Long-term large-scale use of chemical fertilizers such as n
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- 土壤污染 防治 英语