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Method for plant restoration of heavy-metal-contaminated soil

A technology for contaminated soil and phytoremediation, applied in the field of soil remediation, can solve the problems of unqualified, complex technology, secondary pollution and other problems of heavy metal cadmium-contaminated soil remediation, and achieve the effects of low cultivation cost, rapid growth, and resource saving.

Inactive Publication Date: 2019-04-16
BEIJING RES CENT OF INTELLIGENT EQUIP FOR AGRI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the methods for remediating heavy metal cadmium-contaminated soil include physical methods (soil replacement method, steam extraction, electrokinetics, etc.), chemical methods (chemical leaching, oxidation, reduction, solvent extraction, etc.), and the first two methods are costly. , The technology is complex, and the conditions for remediation of large-scale heavy metal cadmium-contaminated soil are not yet available. At the same time, physical methods and chemical methods for remediation of heavy metal cadmium pollution have some shortcomings such as secondary pollution, high cost, complicated technology, and high cost. It is suitable for soil heavy metal cadmium remediation in my country, therefore, it is particularly urgent to find low-cost and high-efficiency soil heavy metal cadmium remediation methods

Method used

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  • Method for plant restoration of heavy-metal-contaminated soil
  • Method for plant restoration of heavy-metal-contaminated soil
  • Method for plant restoration of heavy-metal-contaminated soil

Examples

Experimental program
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Effect test

Embodiment 1

[0030] This embodiment provides a method for phytoremediation of heavy metal cadmium-contaminated soil, comprising the steps of:

[0031] 1) Seedling cultivation of Moss inunica

[0032] Cuncao moss was planted in early April, the amount of seed per mu was 0.5kg, the soil was disinfected and sterilized with 50% carbendazim 800 times solution before sowing, 30 kg of calcium magnesium phosphorus base fertilizer was applied per mu, and the soil surface was covered with 1cm thick soil after sowing , control soil moisture, promote seed germination, and wait until the moss grows to 5cm before transplanting to the heavy metal CdCl 2 on polluted soil.

[0033] 2) Preparation of cadmium-contaminated soil:

[0034] The basic soil was taken from Suihua City, Heilongjiang Province, soil without heavy metal cadmium pollution, dried the soil at 105°C for 8 hours, took 10kg and put it into a square plastic cultivation pot with a size of 40cm*40cm, and then sprayed CdCl 2 Solution, 50mg / kg...

Embodiment 2～3

[0037] The steps in Examples 2 and 3 are the same as in Example 1, except that the concentration of cadmium-contaminated soil in Step 2 is 100 mg / kg and 200 mg / kg respectively.

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Abstract

The invention provides a method for plant restoration of heavy-metal-contaminated soil. The method comprises the following step of transplanting carex duriuscula to the heavy-metal-contaminated soil.According to the method, carex duriuscula is utilized for restoration of the heavy-metal-contaminated soil and has developed root systems, strong tillering capacity, high growth speed, drought resistance and soil depletion resistance; meanwhile, carex duriuscula can be harvested repeatedly, and many new plants can be propagated by simply planting carex duriuscula once since underground parts continuously produce rhizomes; carex duriuscula is resistant to heavy metal particularly cadmium, and can absorb and transfer heavy metal in the soil to the overground parts through the root systems, and the purpose of removing heavy metal cadmium in the soil can be achieved by harvesting the overground parts.

Description

technical field [0001] The technical field of soil remediation of the present invention, more specifically, relates to a method for phytoremediation of heavy metal-contaminated soil. Background technique [0002] At present, the rapid development of urban industrialization discharges a large amount of sewage, irregular mineral mining, and farmland sewage irrigation and other blind behaviors have caused my country to face large-scale heavy metal pollution in the soil. Heavy metal pollution has the characteristics of high residue, refractory degradation, and easy accumulation, and cadmium pollution is the most common. One of heavy metal pollution, compared with other heavy metals, cadmium is more easily absorbed by plants, can be enriched in plant roots, stems, leaves, fruits or seeds, and enters the human body through the food chain, seriously endangering human health. [0003] According to reports, the area of ​​cadmium-contaminated soil in my country has exceeded 280,000 hec...

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 侯佩臣陈立平王成宋鹏李爱学高权
Owner BEIJING RES CENT OF INTELLIGENT EQUIP FOR AGRI
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