Heavy metal contaminated soil degradation harmless treatment method

Abstract

The invention discloses a heavy metal contaminated soil degradation harmless treatment method which comprises the following steps: S1, detecting and analyzing heavy metal contaminated soil, and determining the dosage of a heavy metal contaminated soil degradation repairing agent; S2, preparing the heavy metal contaminated soil degradation repairing agent; S3, leaching; S4, applying the heavy metal contaminated soil degradation repairing agent, and performing ploughing and mixing; S5, planting plants which are suitable for local growth and have enrichment capacity; and S6, detecting until the heavy metal content in the soil reaches the safety standard. Harmless treatment of the heavy metal contaminated soil is achieved, and the requirements of resource utilization, soil replacement and landfill are met; the technology application range is wide, and the method is suitable for remediation of various soils contaminated byheavy metals,including chromium, hexavalent chromium, lead, zinc, copper, chromium, nickel, mercury, arsenic and the like; the technical operation is simple and convenient, the repairing time is short, the capacity increase is less, secondary pollution is avoided, and the cost is lower; and the resource utilization of the polluted soil can be realized, and the repaired soil is suitable for various purposes.

Description

technical field [0001] The invention belongs to the technical field of ecological restoration, and more specifically relates to a degradative and harmless treatment method for heavy metal polluted soil. Background technique [0002] Soil heavy metal pollution refers to human activities, the content of trace metal elements in the soil exceeds the background value, and the excessive content caused by excessive deposition is collectively referred to as soil heavy metal pollution. In the past 200 years, with the progress of human civilization, humans have discharged a huge amount of heavy metal pollutants into the natural ecosystem, and a large number of untreated pollutants have been directly discharged into water bodies and soils. Among them, soil heavy metal pollution mainly comes from the discharge of three industrial wastes, lead pollution mainly comes from smelting emissions and vehicle exhaust gas deposition, the use of pesticides, chemical fertilizers, sludge in agricult...

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Problems solved by technology

[0003] At present, the restoration of heavy metal-contaminated soil mostly adopts soil remediation agents or vegetation restoration methods, but most of the existing soil remediation agents will cause secondary pollution, and phytoremediation has slow growth rate, long growth cycle, and is affected by climate, soil, etc. Problems such as fertility, moisture, salinity, pH, etc. are greatly affected

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