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A kind of remediation method of heavy metal polluted soil

A technology of polluted soil and restoration method, applied in the field of environmental protection of heavy metal pollution, can solve the problem of lack of comprehensive treatment, and achieve the effects of reducing treatment costs, reducing treatment costs, and shortening quality and time.

Active Publication Date: 2015-09-23
桂林矿产地质研究院工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method also only achieves the goal through phytoremediation, and there is no comprehensive treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In the Daxin Lead-Zinc Mine in Daxin County, Guangxi, two schemes were used to compare the treatment results of heavy metal-polluted land. 380mg / g, soil organic matter content 2.89%.

[0043] One option is to adopt the traditional single phytoremediation program, plow the treated land, plant vetiver at a distance of 0.5m, plant 500 plants, and perform regular watering, plant fertilizer and other care.

[0044] Another scheme adopts the method of the present invention, and prepares 4,4-diaminodiphenylmethane, tetraethylammonium bromide, and diethylene glycol-ethyl ether according to the ratio of 1:2.5:1.4 (prepared at 10°C) 5 kg of solidified nutrient solution, the acidity of the organic soil solidifying agent is controlled at pH 5.3, the concentration of the organic soil solidifying agent solution is 1g / L, and the land to be polluted is plowed, and then drilled at a distance of 2.5m, and the injection solution is pressed Inject 0.02kg into the boreholes, set the planti...

Embodiment 2

[0049] Migration test of heavy metal elements:

[0050] In the same piece of land polluted by heavy metals, delineate two pieces of land with the same area and size, and use a spectrometer to detect the content of metals, and delineate the detection route; detect the content of organic matter in the soil, and the test result is the content of organic matter 2.3%.

[0051] In the first piece of land, no treatment was done to allow the heavy metal elements to migrate freely; in the second piece of land, 4,4-diaminodiphenylmethane, tetraethylammonium bromide, and diethylene glycol-ether were used at a ratio of 1:4.0 : 1.2 ratio (prepared at room temperature) mixed solution, the acidity of the organic soil solidifying agent is controlled at pH 6.2, the concentration of the organic soil solidifying agent solution is 4g / L, and then the holes are drilled at a distance of 2.0m, and the injection solution is injected at 2.0kg In the borehole, the planting distance is set to be 3m acco...

Embodiment 3

[0054] Corrosion test of heavy metal elements:

[0055] Soil organic matter content is the most important indicator for evaluating soil planting quality. In order to verify the effect of the present invention on improving organic matter content, two pieces of heavy metal-polluted land with the same area and size were selected at the Manganese Mine in Caiwan Town, Quanzhou County, Guilin, to test the soil organic matter content. . The metal content of the polluted soil was detected by a spectrometer. The heavy metal pollutants in the polluted land are mainly three elements of lead, chromium and cadmium (Pb, Cr, Cd), with a content of 410mg / g. The initial test result of organic matter content in the soil was 1.54% organic matter content.

[0056] No treatment was done in the first piece of land, so that the heavy metal elements could corrode the soil freely; in the second piece of land, 4,4-diaminodiphenylmethane, tetraethylammonium bromide, diethylene glycol-ether were used as...

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Abstract

The invention discloses a repairing method for heavy metal polluted soil. Aiming at heavy metal polluted lands with different pollution degrees, the concentration or the matching ratio of an organic cured solution is controlled so as to control the transferring of heavy metal elements in soil and weaken the corrosion to the soil by heavy meals; particularly, organic nutritional substances are added into the soil so as to ensure the effective supply of a plant growth nutrient solution in ecological repairing; the survival rate of plants is obviously increased and the content of organic matters of the soil is increased.

Description

technical field [0001] The invention belongs to the technical field of environmental protection of heavy metal pollution, and in particular relates to a repair method of heavy metal polluted soil. Background technique [0002] At present, the problem of soil pollution caused by various heavy metals in our country is quite serious. There are 20 million hectares of land polluted by heavy metals nationwide, of which more than 700,000 hectares are seriously polluted, and 130,000 hectares of land have been abandoned due to excessive cadmium content (Chen Huaiman, 2002). Soil pollution not only causes direct economic losses, reduces the quality of agricultural products, affects the quality and use value of soil, but also causes harm to human health and the ecological environment. [0003] Traditional remediation methods for heavy metal-contaminated soil usually use physical and chemical methods, such as landfill, leaching, solidification, and stabilization. Its water solubility,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08B09C1/10
Inventor 程峰宁春旭郑跃鹏
Owner 桂林矿产地质研究院工程有限公司
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