Biochar-based fertilizer for remediation of heavy metal pollution in cultivated land soil

Abstract

The invention relates to a biochar-based fertilizer for restoration of heavy metal contamination of arable soil. The biochar-based fertilizer is composed of, by mass, 50% of biochar, 15% of micropowder of water-chilled dreg from a blast furnace, 30% of fresh cow dung and 5% of a composite biological inoculum. As the biochar and the micropowder of water-chilled dreg from the blast furnace undergo strict screening and effective component activation, the pH value of the soil is increased, the granular structure of the soil is improved, adsorption effect on heavy metal elements in the soil is effectively strengthened, and soil heavy metal restoration effect is enhanced; and in the composite composed by the biochar, the micropowder of water-chilled dreg from the blast furnace, the fresh cow dung and the composite biological inoculum according to a certain proportion, the biochar improves adsorption of heavy metals in a soil solution, the micropowder of water-chilled dreg enhances the silicon utilization rate of crops under the action of an activator, the crops prevent and control migration of heavy metals to the bodies of plants while absorbing silicon so as to reduce heavy metal content in the crops, and the biochar and the micropowder of water-chilled dreg have synergistic interaction in controlling of absorption of heavy metal elements in the soil by the crops.

Description

technical field [0001] The invention belongs to the field of environmental science, relates to soil heavy metal pollution restoration materials, and specifically discloses a biochar-based fertilizer used for restoration of cultivated land soil heavy metal pollution. Background technique [0002] According to the survey conducted by the Ministry of Environmental Protection in 2005 on my country's land area of ​​about 6.3 million square kilometers, the rate of arable land pollution exceeding the standard was 19.4%, and the area exceeding the standard was about 350 million mu. Pollution is increasing. In the past 20 years, the heavy metal Cd in the surface soil has increased by 82.4% in the southwest region, 69.0% in the coastal areas, and 10%-40% in the north, northeast and northwest regions. According to the survey conducted by the Ministry of Agriculture on some soils in rice, wheat, corn, soybean, vegetables and other production areas in 21 provinces (autonomous regions and...

AI Technical Summary

Problems solved by technology

[0004] In recent years, researchers have screened or developed a large number of repair materials for the adsorption of heavy metal pollution. On the one hand, they provide technical support and product guarantee for the repair and treatment of heavy metal pollution in cultivated land; Or mechanical operations have increased the input of agricultural production costs. Due to the low efficiency of agricultural production itself, it is difficult to mobilize farmers to actively participate in the restoration and treatment of heavy metal pollution in cultivated land by using single-action heavy metal restoration materials, and the expensive cost cannot be carried out on a large scale. However, the quality and safety of agricultural products caused by heavy metal pollution in cultivated land has not been effectively controlled, and there is a trend of further deterioration

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