土壤污染及防治英语演示课件

Soil pollution reasons
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Soil pollution hazards and the status quo
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Of soil pollution prevention and control measures
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First, the concept of the characteristics of the soil pollution
Environmental pollution and prevention
Crew：滕达、朱梦浩、沙科成、路飞
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Environmental pollution and prevention
来自百度文库
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The concept of characteristics of the soil pollution
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2 major pollutants
1.Inorganic contaminants (such as heavy metals, acids, salts, etc.)
2.Organic pesticides (such as fertilizers, pesticides, herbicides, etc.)
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3.Excessive application of fertilizers.
Long-term large-scale use of chemical fertilizers such as nitrogen, phosphorus, will destroy the soil structure, resulting in soil compaction, degradation of arable soil tilth shallow plowing deteriorated security fertilizer capacity decline and deterioration of the biological properties, and increase the cost of agricultural production, the impactthe crop yield and quality
1 sewage for irrigation 2 air pollution 3 excessive application of fertilizers 4 heavy use of pesticides 5 solid waste 6 of heavy metals 7 radioactive material contamination of
3.Organic waste (such as biodegradable or degradable organic waste, etc.)
4.Sludge, slag and fly ash, radioactive substances, parasites, pathogens
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3.Characteristics of land contamination
What is soil pollution？ Soil pollution 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 pollution is the waste and toxic and hazardous substances into the soil over the soil selfpurification capacity, destruction of the state of the natural balance of the soil system completely soil quality deterioration or recession phenomenon.
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2 air pollution
Atmospheric pollution can be divided into two categories: gas pollution, such as sulfur dioxide, fluoride, ozone, nitrogen oxides, hydrocarbons, etc.; aerosol pollution, 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.
soil
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1 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, cyanide and other toxic and hazardous substances directly used for farmland irrigation, will pollute the soil.
1 soil pollution has hidden and lag 2 Accumulation of soil pollution 3 soil pollution irreversible 4 soil pollution refractory rational
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Second. Soil pollution reasons