A kind of soil heavy metal composite stabilizer and using method thereof

Abstract

The invention discloses a soil heavy metal compound stabilizer and an application method thereof. The soil heavy metal compound stabilizer comprises the following components in percentage by mass: 50%-80% of organic substances, 16%-40% of a phosphorus fertilizer and 4%-16% of a nitrogen fertilizer. The application method of the soil heavy metal compound stabilizer comprises the following steps: uniformly mixing the soil heavy metal compound stabilizer with soil polluted by virtue of heavy metals at a mass ratio of 1:(5-8) and treating for 15 days. Due to the soil heavy metal compound stabilizer, the application of the stabilizer formed by combination of the organic substances, the phosphorus fertilizer and the nitrogen fertilizer in remediation and ecological restoration of the soil polluted by heavy metals is achieved, not only can the heavy metals in the soil be passivated and stabilized, but also the soil-fertilizing effect can be achieved, the damage to properties of the soil is reduced as possible so as to be conductive to recycling the soil.

Description

technical field [0001] The invention relates to the technical field of soil improvement, and mainly relates to a soil heavy metal composite stabilizer and a use method thereof. Background technique [0002] Soil is the foundation of human beings' survival activities. However, environmental pollution and ecological damage are becoming more and more serious. In recent years, the harm caused by heavy metal pollution such as illegal dumping of chromium slag in Qujing, Yunnan, cadmium rice incident, and blood lead incident has been frequently reported. Heavy metals in soil Pollution has become one of the most concerned public issues in soil pollution. [0003] Common heavy metal contaminated soil remediation techniques mainly include physical, chemical, biological, agricultural regulation and other methods. Among them, the chemical passivation / immobilization technology has the characteristics of wide applicability, large processing capacity, quick effect, and remarkable effect, ...

AI Technical Summary

Problems solved by technology

However, the passivation technology still has the following problems: (1) the stabilization effect of natural clay minerals on heavy metals is slightly weak; (2) phosphorus-containing substances have certain selectivity, and the passivation effects on different heavy metals in soil are different; (3) Secondary pollution problems, such as excessive addition of phosphorus-containing substances can easily cause phosphorus loss and secondary pollution; excessive use of lime causes soil compaction and damages the original physical and chemical properties, etc.

As effective heavy metal complexing agents, organic substances can reduce the phytoavailability of heavy metals by forming insoluble metal-organic complexes, increasing soil cation exchange capacity (CEC), and reducing the water-soluble and exchangeable components of heavy metals in soil

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