Preparation method of ecological restoration matrix for heavy metal-contaminated soil

Abstract

The invention discloses a preparation method of an ecological restoration matrix for heavy metal-contaminated soil. The method comprises the following steps: preparing raw materials including 1-10 parts of fresh pig manure, 1-5 parts of straw stalks and 1-5 parts of corn stalks; grinding the straw stalks and the corn stalks, mixing the ground straw stalks and corn stalks with the fresh pig manureaccording to desired parts by weight to obtain a pre-mixture; mixing 500-800 parts of the pre-mixture with 1 part of brown sugar water; adding 1 part of EM bacterial liquid to obtain a mixture; and fermenting the mixture for 20-25 days. The prepared ecological restoration matrix is suitable for ecological restoration of light and medium heavy metal-contaminated mining areas, mining areas and farmland soil; the method is simple to operate and easy to implement, complex equipment is not needed, and seasonal planting of plants is not affected; the ecological restoration matrix prepared from the pig manure and the stalks can passivate heavy metals in soil, improve the fertility level of soil, promote the realization of ecological restoration effect and effectively utilize agricultural solid wastes, accords with the principles of reduction, harmlessness and recycling, and does not cause atmospheric pollution and water pollution.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a method for preparing a matrix for ecological remediation of heavy metal polluted soil. Background technique [0002] Heavy metal pollution in farmland soil mainly comes from atmospheric deposition of pollutants, sewage irrigation, application of agricultural materials, and stacking of solid waste, among which sewage irrigation and application of agricultural materials are the main sources. With the acceleration of the urbanization process, the development process will more or less involve environmental issues. According to the survey, most of the urban and suburban soils in my country have been polluted by heavy metals to varying degrees. For example, the soil in Nanjing is polluted by Pb, Hg, and Cd. Pollution; In the middle and upper reaches of the Huangpu River, in the survey of agricultural land in 2010, it was found that the mass fractions of Cd, Hg, As, Cr, and Pb...

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Problems solved by technology

[0005] At the same time, there are many existing heavy metal pollution remediation agents, and most of the raw materials used are chemical agents, which may affect the physical and chemical properties of the soil when applied to the soil, and even affect the growth of plants.

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