Magnesite dust polluted soil in-situ purifying method

Abstract

The invention provides a magnesite dust polluted soil in-situ purifying method. The magnesite dust polluted soil in-situ purifying method comprises following steps: 1, artificial removing of impurities, such as weed, bushes, and stones, on polluted soil is carried out; 2, polyacrylic acid is sprayed onto soil surface; 3, 5 to 7 days later, a modifier is applied into soil, and 20 to 30cm deep ploughing is carried out; 4, 15 to 20 days later, biogas slurry is sprayed onto soil surface, and purified soil is obtained 10 to 15 days later. The magnesite dust polluted soil in-situ purifying method iscapable of destroying soil crust, reducing soil pH value at the same time, improving soil permeability and water retention capability, increasing free Ga<2+> in soil through activation and application, coordinating Mg<2+> / Ga<2+> balance, and improving soil physical and chemical properties. The modifier possesses slow release effect, and is capable of solving a subsequent nutrient supply insufficient problem, and achieving excellent social benefit and economic benefit.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a method for in-situ purification of soil polluted by magnesite dust. Background technique [0002] my country is rich in magnesite resource reserves, with proven reserves of about 3.1 billion tons, accounting for a quarter of the world's total reserves, mainly distributed in Liaoning and Shandong provinces, whose total reserves account for about 95.11% of the country's total reserves, of which Liaoning The province is mainly concentrated in the southern part of Liaoning, such as Haicheng, Yingkou and other areas. There are 12 proven mining areas with reserves of 2.577 billion tons, accounting for about 85% of the country's total reserves and 20% of the world's total reserves. Hard and compact crusts are often seen on the soil surface around the magnesite mine area, and the thickest crusts can reach 10cm in severe areas. Magnesium-polluted soil quality declines, crops de...

AI Technical Summary

Problems solved by technology

Magnesium-polluted soil quality declines, crops decrease, the degree of pollution intensifies, and plant species gradually decrease. Plants in severely polluted areas can hardly survive, and only a small number of shrubs and young pine trees survive, causing huge economic losses to agricultural production.