A combined in-situ remediation method of microorganisms and curing agents for heavy metal-contaminated soil

Abstract

The invention provides a combined in-situ restoration method of microorganisms and curing agents for heavy metal-contaminated soil. By mixing magnetotactic bacteria with heavy metal-contaminated soil, the heavy metal-contaminated soil mixed with magnetotactic bacteria is irrigated, and the heavy metal-contaminated soil Set up a magnetic field above, collect the heavy metal-contaminated soil containing magnetotactic bacteria, and wash the heavy metal-contaminated soil above, and fill it back; add a curing agent to the heavy metal-contaminated soil after magnetotactic bacteria adsorption treatment, and after 30-45 days of maintenance, The above steps are repeated cyclically until the content of heavy metals in the soil reaches the safety standard, and the curing agent is composed of SiO2, Fe2O3, Al2O3 and trisodium trimerthioxate. The combined restoration method of microorganisms and curing agents for heavy metal-contaminated soil proposed by the present invention belongs to in-situ restoration, has simple operation, low cost, good restoration effect, no secondary pollution of soil, and is suitable for the treatment of large-scale contaminated soil.

Description

technical field [0001] The invention belongs to the field of contaminated soil treatment, and in particular relates to a combined in-situ restoration method of microorganisms and a curing agent for heavy metal-contaminated soil. Background technique [0002] Soil pollution is caused by excessive harmful substances contained in the soil, exceeding the self-purification capacity of the soil, which causes changes in the composition, structure and function of the soil. Harmful substances gradually accumulate in the soil, through "soil→plant→human body", Or it can be indirectly absorbed by the human body through "soil → water → human body", reaching the level of endangering human health. Soil heavy metal pollution mainly includes mercury (Hg), cadmium (Cd), lead (Pb), chromium (Cr) and metalloid arsenic (As) with significant biological toxicity, as well as zinc (Zn), copper ( Cu), nickel (Ni) and other elements, heavy metal pollution elements have poor mobility in the soil, long...

AI Technical Summary

Problems solved by technology

Due to the convenient operation and quick effect, it plays an irreplaceable role in the process of polluted soil treatment; at present, the main curing agents are cement, lime, fly ash, etc., and their application range is narrow, the cost is high, and some curing agents themselves There are secondary pollution, such as fly ash, the long-term curing effect of the curing agent is unstable, etc.

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