Method for decomposing heavy metals in land

Abstract

The invention discloses a method for decomposing heavy metals in land. The method comprises steps as follows: S1: sequentially stacking, airing, dewatering, crushing, filtering and drying soil polluted by the heavy metals for later use; S2: preparing a saturated soil remediation additive solution from diatomite, calcium superphosphate, selenium methionine, polyaspartic acid, malic acid, oxalic acid, humic acid, urea, montmorillonite, quick lime, medical stone powder, calcined gypsum, zinc chelate and vermiculite; S3, putting 10-12 parts of soil in 20-30 parts of the saturated soil remediationadditive solution, and performing stirring and elution to obtain a soil suspension; S4, settling, filtering, drying and grinding the soil suspension. The method is green and environmentally friendly,has high chelating capability for the heavy metals in land and avoids secondary pollution to the land, and the remediated land reaches the primary standard of the agricultural land.

Description

technical field [0001] The invention relates to the technical field of soil restoration and improvement, in particular to a method for decomposing heavy metals in land. Background technique [0002] Cultivated land is the most precious resource in our country, and wantonly digging sand and soil, stacking waste or other materials in the cultivated land seriously damages the cultivation conditions of the cultivated land. The damaged cultivated land is polluted by a large amount of heavy metals, and its internal The soil itself contains a serious loss of nutrients that can promote the growth of crops, which directly leads to the existing agricultural soil compaction, serious pesticide residues, rampant soil-borne diseases, decreased water retention capacity of soil quality, poor air permeability, and low decomposition and reduction capabilities. At the same time, farmers' awareness of environmental protection is weak, petrochemical dependence is strong, and the heavy metal cont...

AI Technical Summary

Problems solved by technology

However, because the bacteria that adsorbed heavy metals cannot be separated, they still exist in the environment, and then due to various reasons, the heavy metals that have been absorbed by the bacteria will be released into the environment again

In addition, the sensitivity of most microorganisms to redox conditions and changes in the valence state of toxic metals has led to some difficulties in the practical application of bioremediation technology.

In addition, some high salinity soils make bioremediation more difficult

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