Cadmium contaminated soil restoration method

A cadmium-contaminated soil and soil technology, applied in the field of soil heavy metal pollution control, can solve the problem of low repair efficiency, achieve the effect of improving enrichment capacity, increasing absorption, improving transferability and availability

Active Publication Date: 2019-09-20
NANJING AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to make up for the shortcomings of the single repair method and solve the problem of low repair efficiency, the present invention provides a technology for repairing cadmium-contaminated soil by using polyaspartic acid and microorganisms to assist enrichment plants

Method used

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  • Cadmium contaminated soil restoration method
  • Cadmium contaminated soil restoration method
  • Cadmium contaminated soil restoration method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Soil for the test: The soil was taken from the 0-20cm topsoil in the area around a lead-zinc mine in Nanjing. The soil was air-dried, ground, and sieved (20 mesh) before use. The content of Cd in the polluted soil is 8.21 mg·kg, more than 8 times higher than the national third-level standard -1 , pH 7.10.

[0026] 2. Preparation of black nightshade seedlings: sterilize the black nightshade seeds with 0.5% NaClO solution for 20 minutes, rinse them with distilled water, rinse off the shriveled grains, and let them dry naturally for later use. Then spread the sterilized vermiculite in the tray with a thickness of 4-6cm, and sow nightshade seeds therein. The vermiculite trays filled with nightshade seeds are placed in the incubator, and the trays are put into the cultivation room after the nightshade seeds germinate. The cultivation room uses fluorescent tubes to simulate natural light, the day and night cycle is 16 hours of light, 8 hours of darkness, and the relative...

Embodiment 2

[0032] Embodiment 2 applies the influence of polyaspartic acid and microbial bacterial agent to Cd content of Solanum nigrum jointly

[0033] The experimental method is the same as in Example 1, and the results are shown in Table 2. The combined application of microbial agents and polyaspartic acid can significantly increase the Cd content in Solanum nigrum, and the effect is: PASP+PGPR>PASP>PGPR. Compared with the single application of PGPR or PASP, the combined application increased the Cd content in the shoot and underground parts of Solanum nigrum by 252.1%-344.1% and 131.3%-312.6%, respectively. It can be concluded from Table 3 that the combined application of microbial agents and polyaspartic acid has increased the extraction of Cd in the shoots and underground parts of Solanum nigrum up to 8 times, and the significance is higher than that of a single application, indicating that the use of polyaspartic acid The combination of acid and microorganisms to assist Solanum ni...

Embodiment 3

[0039] A method for repairing cadmium-contaminated soil, comprising the following steps:

[0040](1) Cultivate Solanum nigrum seedlings, and when the seedlings grow to three leaves and one heart, select the robust and consistent seedlings to be transplanted into the cadmium-contaminated soil that needs to be repaired;

[0041] The specific process of cultivating black nightshade seedlings is as follows: sterilize black nightshade seeds with 0.5% NaClO solution for 20 minutes, rinse them with distilled water, rinse off the shriveled grains, and dry them naturally for later use; 4-6cm, where the nightshade seeds are sown; the vermiculite trays containing the nightshade seeds are placed in the incubator, and the trays are placed in the cultivation room after the nightshade seeds germinate; the cultivation room uses fluorescent tubes to simulate natural light, and the day and night cycle is 16h Light, 8h dark, relative humidity controlled at 80%.

[0042] (2) Solanum nigrum seedl...

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Abstract

The invention relates to the technical field of soil heavy metal contamination treatment, particularly to a cadmium contaminated soil restoration method with accumulator plants assisted by polyaspartic acid (PASP) and plant growth-promoting rhizobacteria (PGPR). The method comprises planting the heavy metal accumulator plants in cadmium contaminated soil, adding in the PASP, then applying microbial agents, and after the plants grow and ripen, harvesting the plants to accordingly remove the heavy metal of Cd from the soil and further achieve cadmium contaminated soil restoration. By means of combined application technology, the cadmium contaminated soil restoration method can greatly promote plant growth and significantly enhance the capability of cadmium absorption and accumulation of the plants; compared with strengthening measures singly with chelating agent or microorganisms, the combined application technology can significantly improve the plant restoration efficiency and achieve higher application values. The combined application measure applied in the cadmium contaminated soil restoration method has the advantages of being simple in operation, high in restoration efficiency, short in restoration cycle and the like.

Description

technical field [0001] The invention belongs to the technical field of soil heavy metal pollution control, and specifically relates to a technology for repairing cadmium-contaminated soil by using polyaspartic acid (PASP) and plant growth-promoting bacteria (PGPR) to assist enrichment plants. Background technique [0002] Along with human activities such as metal smelting, soil fertilization, pesticide use and industrial development, a large amount of heavy metals are discharged into the environment, threatening the environmental ecosystem and human health. Soil heavy metal pollution has become one of the most serious environmental problems. Therefore, developing reliable, safe, environmentally friendly, and economical methods to control or reduce soil heavy metal pollution has attracted great attention. [0003] Phytoremediation, as a green and environmentally friendly technology for remediating toxic and heavy metal pollution, is the most widely used. However, due to many...

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 夏妍何晓满沈振国许晓明陈亚华李信钱猛
Owner NANJING AGRICULTURAL UNIVERSITY
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