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Method for remediating rare earth contaminated soil by combining plant intercropping with rhizobium

A rare earth pollution and rhizobia technology, applied in the field of rare earth contaminated soil remediation, can solve problems such as limited remediation efficiency of phytoremediation technology, achieve excellent remediation effect, improve soil fertility, and low cost input.

Inactive Publication Date: 2021-03-12
江西省核工业地质局二六四大队
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Phytoremediation has the characteristics of low cost and greenness. However, the remediation efficiency of a single phytoremediation technology is limited. There is still a lot of room for optimization of phytoremediation methods for soil improvement and removal of rare earth elements in rare earth contaminated soil.

Method used

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  • Method for remediating rare earth contaminated soil by combining plant intercropping with rhizobium
  • Method for remediating rare earth contaminated soil by combining plant intercropping with rhizobium
  • Method for remediating rare earth contaminated soil by combining plant intercropping with rhizobium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In this example, an ecological restoration experiment was carried out in the selected test area of ​​the Lingbei abandoned rare earth mine in Dingnan County, Ganzhou City. The average content of rare earth elements in the test area selected in this example was 125.50 mg / kg, which belonged to a low-pollution area. In this embodiment, five treatment groups are set up, which are respectively marked as treatment I, treatment II, treatment III, treatment IV and treatment V.

[0021] 1. Development of ecological restoration

[0022] (1) Treatment I

[0023] S1. Build vegetation:

[0024] Fully plow the soil with a plowing depth of 18-25 cm, a hole diameter of 0.6 m, and a depth of 0.5 m; apply 350 kg / ha of calcium magnesium phosphate fertilizer, 300 kg / ha of potassium chloride, and 15-30 tons / ha of decomposed farmyard manure; Seeds of Albizia Julibrissin and Paspalum broadleaf were soaked in water at 50-60°C for 4 hours, and after natural air-drying, they were spread evenly...

Embodiment 2

[0078] In this example, an ecological restoration experiment was carried out in the selected test area of ​​the Lingbei abandoned rare earth mine in Dingnan County, Ganzhou City. The average content of rare earth elements in the test area selected in this example was 274.0mg / kg, which belonged to the medium and high pollution area. In this embodiment, four treatment groups and one control group are set up, wherein the four treatment groups are respectively marked as treatment I, treatment II, treatment III and treatment IV.

[0079] 1. Development of ecological restoration

[0080] (1) Treatment I

[0081] It is the same as the embodiment of the treatment I of Example 1.

[0082] (2) Treatment II

[0083] The embodiment is the same as that of the treatment III of Example 1.

[0084] (3) Treatment III

[0085] It is the same as the embodiment of the control I of Example 1.

[0086] (4) Treatment IV

[0087] It is the same as the embodiment of the treatment IV of Example 1...

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Abstract

The invention provides a method for remediating rare earth contaminated soil by combining plant intercropping with rhizobium. The method comprises the following steps of: S1, constructing vegetation:sowing seeds of vegetation crops in a soil area to be remediated, wherein the vegetation crops comprise leguminous plants and paspalum plants, the leguminous plants are selected from at least one of albizia plants, sophora plants and ormosia plants; S2, inoculating rhizobium: after the leguminous plants emerge for 5-15 days, adding rhizobium into root system soil of the emerged leguminous plants;and S3, transferring a hyperaccumulator: harvesting the plant part, exposed out of the ground, of the vegetation crops when the average plant height of the leguminous plants reaches 1.2-1.5m. The method is suitable for remediation treatment of rare earth waste residue storage sites like rare earth mines, stopes and various waste rock piles and tailing piles, and has the advantages of fast construction, low cost, easy and convenient operation and management, high remediation efficiency, small environmental risk, environment beautifying and the like.

Description

technical field [0001] The invention belongs to the technical field of remediation of rare earth polluted soil, and in particular relates to a method for remediating rare earth polluted soil by using plant intercropping combined with rhizobia. Background technique [0002] The long-term mining of rare earth mines in southern my country has caused a large amount of soil and surface vegetation damage, and produced a large amount of waste liquid, ore soil, tailings and tailings, causing soil erosion, and causing water heavy metal pollution and eutrophication, causing huge damage to the mining environment. In addition, the excessive use of chemicals in in-situ leaching pollutes the soil and water in the mining area, changes the chemical environment of the soil, acidifies the mine, makes the soil barren, and enriches ammonia nitrogen, forming a large-scale mine wasteland, which poses a threat to the mining area and its surrounding residents. The area has been seriously affected, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10
CPCB09C1/105B09C2101/00
Inventor 稂涛宋勇陈仁祥钟名星熊玮玮梁惕平王太伟马涛
Owner 江西省核工业地质局二六四大队
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