Role of zero-valent iron in the degradation of organochlorine substances in groundwater

Various organochlorine compounds such as pesticides, insecticides, plant growth regulators, fumigants, and others are used in agriculture. Because of the presence of chlorine, these compounds are dangerous pollutants, which contaminate soils and surface and ground waters. For the degradation of organochlorine pollutants, zero-valent (metallic) iron Fe0, an inexpensive reducer, is used. The activity of Fe0 decreases with time; therefore, for its restoration, the surface layer of Fe(III) (hydr)oxides is removed necessary to. For this purpose, the surface of Fe0 nanoparticles is modified, and mineral activators of hydrogenation (e.g., Ni) are added. Under anaerobic conditions, the activity of metallic iron is reduced by Fe-reducing bacteria. The Fe0 barrier work period is extended by active corrosion products, primarily green rust: Fe(II)/Fe(III) layered double hydroxides with different interlayer anions. Positive results for the degradation of organochlorine compounds have been obtained.