A method for in-situ passivation of heavy metals in the soil of corn straw synergistically weathered coal

Abstract

The invention discloses a method for in-situ passivation of heavy metals in the soil of a facility by synergistic weathering of corn stalks and coal. Air-dried and crushed corn stalks to obtain straw raw materials, spread the straw raw materials at a rate of 1800-2500kg / hm2 to a depth of 20-30cm from the surface of the facility soil, and dig out the surface layer of facility soil with a thickness of 20-30cm; diluted with distilled water at a volume ratio of 1:100 to 1:200, and the diluted EM bacteria solution was evenly sprayed on the surface of straw raw materials at 280 to 350 L / hm2; Mix evenly with weathered coal, the amount of weathered coal is 720-780kg / hm2, and cover the mixed facility soil on top of the flat straw raw materials. The invention has the advantages of simple operation and low cost, and can effectively reduce the content of available heavy metals in the facility soil.

Description

technical field [0001] The invention belongs to the field of agricultural production, and in particular relates to a method for in-situ passivation of heavy metals in the soil of a facility using corn stalks for synergistic weathering of coal by returning the straws to the field efficiently. Background technique [0002] As one of the most important agricultural production methods in the world, facility soil accounts for an increasing proportion of my country's agricultural production. There are phenomena such as large input of agrochemicals and organic fertilizers, high replanting rate, and high cultivation intensity, which lead to a series of restrictions. Soil degradation problems in protected agricultural planting, such as secondary salinization, deterioration of biological properties and continuous cropping obstacles, heavy metal pollution and excessive residues of harmful substances, etc. Among them, the accumulation of heavy metals and even pollution, not only restrict...

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Problems solved by technology

[0008] The above-mentioned existing technologies are all modified straws to prepare adsorption materials. However, their common problems are that they need to go through the modification process, and there are many limiting factors in application. At the same time, they are mainly used in the adsorption of heavy metal pollution in water.

[0009] The inventor also retrieved the patent of publication number CN104263374A "A Soil Heavy Metal Composite Stabilizer and Its Application Method", which discloses a soil heavy metal composite stabilizer comprising organic matter, phosphate fertilizer and nitrogen fertilizer. The mass ratio is 1:5-8 and the invention is mixed evenly for 15 days, but the organic matter used in this invention is natural decomposed cow dung or fungus residue, and does not use corn stalks, which are more widely obtained

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