Iron powder used for soil treatment

With the development of the industry, the increasingly serious pollution, high content of heavy metals in soil Hexavalent chromium carcinogens and large amounts of toxic and harmful organic pollutants (pops) such as serious threat to people's health, for the repair of the soil is the significant particularly important due to the iron price is low, nonpoisonous and harmless, for a variety of organic matter degradation performance and remove hexavalent chromium;Iron powder is widely used in soil remediation and treatment. The methods of soil remediation and treatment mainly include several as shown in Table 1.

Item	Soil	Underground Water
Vocs	Iron powder mixed, heat treated	Iron powder can be permeable reaction wall, water pumping, anaerobic microbial degradation, oxidative decomposition.
Heavy metal	Soil washing	Adsorption of permeable reaction wall, water pumping.
Oil, benzene,	Heat treatment, aerobic microbial degradation oxidation decomposition	Oxidative decomposition, aerobic microbial degradation

In practical application, it is found that the higher the specific surface area of iron powder is, the higher the activity is, the stronger the adsorption performance is, and the better the removal effect of pollutants in the soil is, and the removal time is shorter.