A chelating agent slow-release body for heavy metal soil restoration

Abstract

The invention relates to a chelating agent slow-release body for heavy metal soil restoration, the overall appearance of the chelating agent slow-release body is a wrinkled polygonal columnar structure, and the chelator slow-release body includes a fertilizer structure layer arranged sequentially from outside to inside, PHA structural layer, biochar structural layer. The chelating agent slow-release body for heavy metal soil restoration of the present invention utilizes decomposed garden waste and nitrogen, phosphorus and potassium compound fertilizers to increase the fertility of heavy metal-contaminated soil while releasing a small amount of chelating agent to activate heavy metals for plant seedlings to absorb and utilize, and then use more chelates The mixture activates heavy metals for mature plants to absorb and utilize, and finally utilizes the characteristics of biochar to fix and adsorb heavy metals to purify the polluted soil in stages and layers, forming an environmentally friendly and environmentally friendly treatment system.

Description

technical field [0001] The invention relates to the field of soil remediation, in particular to a chelating agent slow-release body for heavy metal soil remediation, which is suitable for remediation of heavy metal polluted soil. Background technique [0002] The "phytoremediation" of soil heavy metal pollution refers to the planting of green plants in polluted soil, and the removal of pollutants in the environment or the elimination of pollution through the special absorption and enrichment capabilities of the plants on heavy metal elements or organic substances in the soil. Toxicity of the substance. However, currently the most valuable hyperaccumulator plants are short in size, low in biomass, slow in growth and long in life cycle, and thus have low restoration benefits. The use of common plants with fast growth and large biomass is an effective and feasible alternative to joint phytoremediation assisted by other technologies, such as metal chelator-enhanced chemical-pla...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a kind of chelating agent sustained-release body for heavy metal soil restoration for the secondary pollution of soil after the chelating agent is quickly released into the soil and the low efficiency of heavy metal absorption by ordinary plants due to insufficient soil fertility. Improve soil fertility and improve the effect of heavy metal pollution control

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