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Soil treatment

Soil treatment is to transfer, absorb, degrade and transform the pollutant in the soil by physical, chemical and biological methods, and to reduce its concentration to an acceptable level, or to transform the harmful pollutant into non-harmful substance. So basically, the technical principles of polluted soil treatment include: (1) change the existing form of pollutant in soil or its way of combination with soil, and reduce its mobility and bio-availability; (2)reduce the concentration of hazard substances in soil.

Early in 1990s in America, the investment on soil treatment was early 100 billion. The theory and technology of soil treatment has become the frontier of the whole environment science and technology research. Since the soil treatment is a long process, it need the joint effort of the scientists in different areas, such as soil, agriculture, ecology, bio-geochemistry, marine, and the effort of many production organizations and government policy-makers in relevant areas such as agriculture, forestry, fishery, etc.

Soil pollution in China has posed danger to the sustainable use of soil resource and the ecological safety of agricultural products. The field polluted by organic pollutants has reached 6 million acres and the main pollutants includes petroleum, PAH, pesticide, organic chloride, etc; the area seriously polluted by petroleum due to the oil production has reached 10,000 acres, and the petroleum refining industry also cause pollution to a large area of soil; in waste water irrigation district, the PAH content in surface and subsurface soil exceeds 600 mg/kg, causing a serious pollution to crop and underground water. The polluted area in China has reached 20 million acres in total among which the area of seriously polluted land is more than 700 thousand acres, and 130 thousands acres of land has been discards because its chromium content is out of limit. Therefore, the soil treatment research in China is in a transition period from lab research to practical phase, and will enter a rapid, comprehensive treatment period.

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