Abstract
This thesis analyzes the source of soil chromium pollution, its harmfulness, the occurrence form, migration and transformation of chromium in soil in detail. At the same time, the mechanism of chemical and bioremediation technology to treat soil chromium pollution was also discussed. From the statistical data analysis of soil chromium pollution sources, the main sources of soil chromium pollution are atmospheric sedimentation, agricultural fertilization, sewage irrigation, non-ferrous metallurgy and the geochemical cycle of chromium in nature. In nature, chromium mainly exists in two stable forms of trivalent chromium and hexavalent chromium, Cr(VI) is a toxic chromium valence state, which can penetrate deep into the soil, destroy the soil structure, and cause serious pollution to the soil. Therefore, the key to the remediation of chrome-contaminated soil is to remove the free Cr (VI).
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