Method for repairing heavy metal contaminated soil through magnesium oxide and microorganisms

Abstract

The invention provides a method for repairing heavy metal contaminated soil through magnesium oxide and microorganisms, and belongs to the technical field of geotechnical engineering. The method comprises the steps of preparation of a mixture, preparation and detection of an improved mixture, and remediation of the heavy metal contaminated site. The mixed material contains magnesium oxide, the improved mixed material comprises a mixed material and a microbial liquid, and the repairing is performed by paving a plurality of layers of geomembranes and a plurality of layers of improved mixed materials on the heavy metal polluted site. According to the heavy metal polluted site repaired through the method, curing of harmful elements can be achieved, and pollution to the environment is reduced. Particularly, the magnesium oxide is added to provide an alkaline environment for microorganisms, so that the carbonate minerals can better wrap and adsorb heavy metal ions, and a reaction product of the carbonate minerals and the microorganisms can fix carbon dioxide to make a contribution to atmospheric pollution treatment in China. In addition, a cheap culture medium is adopted for microorganism culture, and cost is reduced.

Description

Technical field [0001] The present invention belongs to the field of geotechnical technology, involving a method of magnesium oxide and microorganism repairing heavy metal contaminated soil, specifically using magnesium oxide and bacterial treatment of heavy metal contamination soil repair method. Background technique [0002] With the development of my country's industrialization and urbanization, polluting enterprises in the suburban area have gradually implemented retreating into the park, shutting down and turning. Due to the relocation of polluting enterprises, a large number of heavy metal pollution venues have been left, and the secondary development and utilization of the site is also resolved. The method of repairing the existing heavy metal pollution site mainly includes physics, chemistry, physical chemistry, plant, microbial repair, and a variety of ways to cooperate. The microbial repair method has the advantages of low energy, rapid, efficient, green compared to the...

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Problems solved by technology

[0006] 1. Entitled "Implications for Interpreting Calcite Precipitation and for Solid-Phase Capture of Inorganic Contaminants[J]" (P Li, W Qu.springer International Publishing, 2015.) (Li Pu, Qu Wu "Factors Affecting Calcite Solidification of Inorganic Contaminants ", Springer International Publishing, 2015), suggesting that biotechnology works better in weakly alkaline heavy metal-polluted soils, but the effect will be greatly reduced in acidic soils

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