A kind of humic acid nano zero-valent iron soil cr pollution remediation agent and preparation method

Abstract

The invention discloses a humic acid nano zero-valent iron soil Cr pollution repairing agent and a preparation method thereof. The humic acid nano zero-valent iron soil Cr pollution repairing agent comprises the following components in parts by weight: 10-20 parts of activated humic acid, 10-20 parts of straw biochar, 1-3 parts of nano zero-valent iron, 10-20 parts of diatomaceous earth and 15-25parts of sputum. The humic acid nano zero-valent iron soil Cr pollution repairing agent is capable of simultaneously realizing the repair of Cr pollution, the conditioning of soil and the protection of crops, is a three effects integrated three-dimensional ecological soil Cr pollution repairing agent, and has remarkable economic and ecological benefits.

Description

technical field [0001] The invention relates to the technical field of soil heavy metal pollution restoration, in particular to a humic acid nano zero-valent iron soil Cr pollution restoration agent and a preparation method. Background technique [0002] With the rapid development of industry and agriculture, the discharge of industrial "three wastes" and the reclamation of minerals have caused the heavy metal pollution in the soil-plant-animal (human)-environmental system to become increasingly serious. Cr is a highly toxic teratogen and mutagen. About 750,000 to 900,000 tons of chromium-containing waste residues are produced in my country every year. 6+ The degree of accommodation is different, and the toxicity is represented by Cr 6+ maximum. The prevention and control of chromium pollution in my country started relatively late, and there is no domestic standard for chromium pollution control, so the restoration of soil chromium pollution is of great significance. [0...

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Problems solved by technology

Among them, the leaching method is only suitable for sandy soil and other soils with large permeability coefficients, which is prone to secondary pollution, high cost, and limited in engineering practical application; the reduction stabilization method is currently a cost-effective technology for remediating chromium-contaminated soil. Using chemical reducing agents such as ferrous salts as the basic agent to reduce and stabilize Cr(VI) has a short repair period and good effect, and can be applied on a large scale. However, the curing and stabilization process tends to reduce soil fertility and destroy the microbial environment, and the soil structure after repair becomes poor. , the ecological function is also basically lost; the bioremediation method refers to the use of microbial biochemical action to restore and stabilize Cr(VI). This technology has the advantages of low repair cost, environmental friendliness, and improved soil ecological performance, but the repair period is long, and it is difficult to achieve short-term rapid repair. And it is difficult to remediate heavily chromium-contaminated soil

[0004] Therefore, there are many deficiencies in the existing soil chromium pollution remediation methods, and there are no chromium pollution remediation agents and remediation methods that can realize the multiple effects of chromium pollution remediation, soil conditioning and crop maintenance.

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