Heavy metal contaminated soil remediation agent, application thereof and contaminated soil remediation method

Abstract

The invention relates to a heavy metal contaminated soil remediation agent, application thereof and a contaminated soil remediation method. The heavy metal contaminated soil remediation agent comprises, by weight, 50-80 parts of sludge, 20-30 parts of biochar, 12-20 parts of organic matter, 10-20 parts of plant ash, 5-10 parts of montmorillonite clay, 5-10 parts of ferroferric oxide, 2-5 parts of sodium chloride and 3-8 parts of sodium phosphate, and preferably, the remediation agent further comprises 1-3 parts of humic acid. The invention further provides application of the heavy metal contaminated soil remediation agent and the contaminated soil remediation method. The heavy metal contaminated soil remediation agent avoids secondary pollution generated during heavy metal contaminated soil remediation, the remediation period is shortened, and the remediation effect is good.

Description

technical field [0001] The invention relates to a soil remediation agent, in particular to a heavy metal-contaminated soil remediation agent and its application and a method for remediating polluted soil. Background technique [0002] Heavy metal pollution of the soil refers to human activities, the content of trace metal elements in the soil exceeds the background value, and the excessive content caused by excessive deposition is collectively referred to as soil heavy metal pollution. [0003] Heavy metals generally refer to about 60 elements with a specific gravity above 4.0 or about 45 elements with a specific gravity above 5.0. Heavy metals in environmental pollution research mainly refer to elements with significant biological toxicity such as Pb, Cd, Hg, Cr, and metalloid As, and also include heavy metals such as Zn, Cu, Co, Ni, and Sn with certain toxicity. Some heavy metal elements are essential elements for the human body and other organisms, but their concentratio...

AI Technical Summary

Problems solved by technology

However, in the currently disclosed heavy metal chemical fixation technologies, the substances used are harmful to the environment. If they are put into the soil, they may cause secondary pollution of the soil. In addition, some chemical fixation methods have heavy metals that are processed more Single, longer repair period, poor long-term repair effect, etc.

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