Method for remedying heavy metal contaminated farmland soil

A technology of polluted soil and heavy metals, applied in the restoration of polluted soil, etc., can solve the problem of contaminated soil disposal and whereabouts, and achieve the effect of solving the problem of soil fertility decline and no whereabouts

Inactive Publication Date: 2016-12-14
BEIJING GEOENVIRON ENG & TECH
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Problems solved by technology

It not only avoids the problem of heavy metal passivation repair effect, but also solves the problem of the whereabouts of contaminated soil after soil replacement, and adopts a combined repair method to ensure the safety of crop planting

Method used

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  • Method for remedying heavy metal contaminated farmland soil

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Embodiment 1

[0015] A farmland area in Shanxi Province was selected. The soil pH of the farmland area was between 7.44-8.69, which was generally alkaline. The concentration of mercury in this farmland area is between 0.06-2.05mg / kg, the concentration of cadmium is between 0.19-0.72mg / kg, the concentration of chromium is between 70.8-14.5mg / kg, and the concentration of lead is 10.5-46.7mg / kg. kg, the concentration of arsenic is between 5.71-16.9mg / kg. In addition, the distribution of soil heavy metals in the profile showed a trend of high in the surface layer and low in the deep layer. Among them, the concentration of heavy metals in the soil at the depth of 0-20cm was the highest, and the concentration of heavy metals in the soil between 20-50cm was significantly lower. The soil depth reaches 50-100cm and the soil between 20-50cm is close. According to the secondary standard of "Soil Environmental Quality Standards", it was found that mercury and cadmium exceeded the standard.

[0016] ...

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Abstract

The invention discloses a method for remedying heavy metal contaminated farmland soil. The method comprises the steps that firstly, in the heavy metal contaminated farmland soil, shallow contaminated soil and the deep soil which is free from heavy metal contamination are cleared and dug, and the shallow contaminated soil the and deep soil which is free from heavy metal contamination are separately and temporarily stored; secondly, the shallow contaminated soil is remedied by adding heavy metal passivant into the shallow contaminated soil; thirdly, the qualified soil remedied in the second step is backfilled to the position of the original deep soil which is free from heavy metal contamination and compacted, and the deep soil which is free from heavy metal contamination is backfilled on the qualified soil; and fourthly, the deep soil which is free from heavy metal contamination and located on the upper side is improved to be suitable for crop plantation. According to the method for remedying the heavy metal contaminated farmland soil, through combined utilization of soil turning and replacement and heavy metal passivation, the problem that edible parts of crops still cannot reach the food standard possibly after heavy metal passivation is conducted in a seriously contaminated area is solved, and the problem that the fertility of the soil is lowered when the heavy metal passivant is applied for a long time is also solved.

Description

technical field [0001] The invention relates to a method for repairing farmland heavy metal polluted soil, belongs to the technical field of environmental protection, and is mainly used for repairing farmland heavy metal polluted soil. Background technique [0002] Heavy metal pollution in farmland soil is one of the major environmental problems today. Heavy metals are difficult to degrade, easy to accumulate, and highly toxic, which have an impact on the growth, yield and quality of crops. In particular, they are also absorbed by crops into the food chain, thus becoming a potential threat to human health. [0003] At present, the methods used to remediate heavy metals in farmland soil include physical, chemical and biological methods. The bioremediation method has the advantages of low repair cost and no secondary pollution, but the bioremediation cycle is long, and the farmland is occupied for a long time for phytoremediation, which damages farmers' income; the chemical r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/00B09C1/08
Inventor 魏丽冯国杰苗竹吕正勇任贝朱湖地李淑彩倪鑫鑫
Owner BEIJING GEOENVIRON ENG & TECH
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