Passivation regulator for remediating heavy-metal-polluted farmland and preparation and use method thereof

Abstract

The invention discloses a passivation regulator for remediating heavy-metal-polluted farmland and a preparation and use method thereof. The passivation regulator is prepared from, by weight, 40-50 parts of organic fertilizer, 30-50 parts of limestone and 3-5 parts of microbial agent, and the microbial agent comprises bacillus subtilis, bacillus licheniformis and paenibacillus polymyxa. For moderately or lightly heavy-metal-polluted farmland, the adsorption precipitation performance of the organic fertilizer and the limestone and the fungus inhibiting, phosphorus dissolving and heavy metal passivating capabilities of the microbial agent are utilized on the basis of the current passivation technology, and the composite regulator capable of improving the physical and chemical properties of soil, controlling soil-borne diseases and passivating the heavy metal cadmium and lead, and the preparation and use method thereof are provided.

Description

technical field [0001] The invention relates to the technical field of environmental restoration engineering, in particular to a passivation regulating agent for repairing heavy metal-contaminated cultivated land and a preparation and use method thereof. Background technique [0002] The heavy metals that cause pollution to the soil environment mainly include elements with significant biological toxicity such as mercury (Hg), cadmium (Cd), lead (Pb) and metalloid arsenic (As), as well as copper (Cu), which is biologically toxic due to excessive accumulation. , nickel (Ni), zinc (Zn) and manganese (Mn) and other common elements. With the rapid development of the economy, heavy metal pollution incidents in my country's soil have occurred frequently in recent years, which not only seriously threatens the quality of cultivated land and agricultural products, but also directly damages the health of the people and affects social stability. At present, the agricultural land pollut...

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Problems solved by technology

[0004] At present, the commonly used chemical remediation technology is mainly to reduce the content of exchangeable heavy metals in the soil by changing the pH value of the soil or adding a solidification agent to cause a complex reaction with the heavy metals in the soil. Insufficient passivation, often need to use a large amount of passivating agent to achieve a specific effect, there are problems such as high cost, affecting crop yield, high risk of secondary pollution, and easy to cause the loss of nutrients in the soil

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