Method for restoring soil polluted by heavy metal through porous medium particles
A technology for porous media and polluted soil, applied in the field of soil environmental pollution control, can solve the problems of low environmental risk, high cost and large environmental disturbance in ex-situ treatment, and achieve the effect of improving ion exchange capacity, low cost and huge environmental benefit.
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[0021] Biomass semi-coke was used as soil remediation agent to remediate the soil with excessive heavy metal cadmium content in the soil. The cultivation in this area adopts the furrow and ridge cultivation method, and the height difference between the furrow and ridge is about 300mm. In order to prevent the soil remediation agent layer from exposing the soil surface, biomass semi-coke is added to the top of the ridge 400mm below the soil surface to form a semi-coke with a thickness of 50mm. Coke restorer layer. The soil above the soil remediation agent layer is normally tilled. The local average annual rainfall is 600mm, and normal agricultural irrigation has been carried out. After 12 months, soil heavy metal detection was carried out, and the cadmium content in the upper soil layer of the soil remediation agent layer was reduced from 0.95 mg / kg to 0.15 mg / kg, meeting the requirements of the national standard for soil heavy metals. Afterwards, the soil on the upper part of...
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