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Method for repairing heavy metal polluted soil using combined technology of interacted plants and chemical leaching

A technology of contaminated soil and chemical leaching, applied in the restoration of contaminated soil, etc., can solve the problem of no heavy metal polluted soil, and achieve the effect of improving repair efficiency, high repair efficiency, and simple operation

Inactive Publication Date: 2008-10-08
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, there is currently no low-cost, rapid in-situ method for remediating heavy metal-contaminated soils without interrupting agricultural production

Method used

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  • Method for repairing heavy metal polluted soil using combined technology of interacted plants and chemical leaching
  • Method for repairing heavy metal polluted soil using combined technology of interacted plants and chemical leaching

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Experimental program
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Embodiment 1

[0033] The experiment of this embodiment was carried out in the network room of the Department of Environmental Science and Engineering, South China Agricultural University. The potting soil was taken from a paddy field polluted by wastewater from a lead-zinc mine in Lechang City, Guangdong Province. The heavy metals Zn, Cd and Pb exceeded the national soil environmental quality standard (GB15618 -1995). In the case of Zn / Cd hyperaccumulator-sedum (Sedum alfredii H.) and low-accumulation corn (Zea mays) interaction, the soil was leached. A total of 5 treatments were set up in the leaching test. The setting method is shown in the table 1. Four replicates were set up for each treatment.

[0034] Select Sedum sedum branches of the same size and directly insert them, 6 trees per pot, sow the corn directly and wait for 3 leaves to grow, then thin the seedlings, and keep 2 corn trees in each pot.

[0035] 40 days before the harvest of the plants, start the leaching treatment accord...

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Abstract

The invention discloses a method for repairing soil pollution caused by heavy metals by the combining technologies of interacting plants and chemical leaching, which realizes combining repairing by the interacting between Sedum alfredii Hance and corns as well as by carrying out chemical leaching by a mixing additive. The interacting plants selected by the invention are the corns and the Sedum alfredii Hance and are planted on the soil polluted by the heavy metals; when the Sedum alfredii Hance and the corns enter a growing blooming period, the mixing additive is used for carrying out leaching on the soil to reduce the heavy metals in the soil by harvesting plants and leaching liquid, thereby realizing the repairing on the soil polluted by the heavy metals. The content of the heavy metals in the corn seeds produced by the invention meets the national sanitation standard for feedstuff, the content of the heavy metals at the stem and leaf parts of the corn plants meets the standard of commercial organic fertilizer, and the corns are farm produces with economic values. The leaching waste liquid produced by the invention can be fixed and processed by lime. The method of the invention can realize that agricultural manufacture is carried out on the polluted soil while repairing and treatment. The method of the invention is a new effective repairing approach for soil polluted by the heavy metals with low cost.

Description

technical field [0001] The invention relates to a combined technology for remediating heavy metal-contaminated soil, in particular to a method for remediating heavy metal-contaminated soil by utilizing the interaction of sedum sedum and corn, plus chemical leaching. Background technique [0002] With the development of industrial and agricultural production, the problem of heavy metal pollution in the soil-plant-water system is becoming more and more serious. At present, the farmland polluted by heavy metals in my country may reach 20 million hectares 2 , accounting for 1 / 5 of my country's arable land. According to the environmental protection monitoring system of the Ministry of Agriculture, 5.482 million hm2 of 320 seriously polluted areas in 24 provinces and cities nationwide 2 Soil surveys found that the area of ​​farmland agricultural products polluted exceeding the standard accounted for 20% of the farmland area in the polluted area, and heavy metals accounted for 80...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08B09C1/10
Inventor 吴启堂卫泽斌黄细花丘锦荣陈娴
Owner SOUTH CHINA AGRI UNIV
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