A method for remediating cadmium-contaminated soil

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, broadening application fields, and improving repair efficiency

Active Publication Date: 2020-09-15
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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  • A method for remediating cadmium-contaminated soil
  • A method for remediating cadmium-contaminated soil
  • A method for remediating cadmium-contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Soil for test: The soil was taken from 0-20cm topsoil in the surrounding area of ​​a lead-zinc mine in Nanjing. The content of Cd in the polluted soil is more than 8 times of the national third-level standard, which is 8.21mg·kg -1 , with a pH of 7.10.

[0026] 2. Preparation of Solanum nigrum seedlings: sterilize the seeds of Solanum nigrum with 0.5% NaClO solution for 20 minutes, rinse with distilled water, rinse off the shriveled valleys, and air-dry them for later use. Then, the sterilized vermiculite is spread in a tray with a thickness of 4-6 cm, and the seeds of nightshade are sown in it. The vermiculite tray containing the nightshade seeds is placed in the incubator, and the trays are placed in the culture room after the nightshade seeds germinate. The culture room uses fluorescent tubes to simulate natural light, with a day-night cycle of 16 hours of light and 8 hours of darkness, and the relative humidity is controlled at about 80%. When the seedlings gr...

Embodiment 2

[0032] Example 2 The effect of combined application of polyaspartic acid and microbial inoculum on the Cd content of Solanum nigrum

[0033] The experimental method is the same as that in Example 1, and the results are shown in Table 2. The combined application of microbial inoculants and polyaspartic acid significantly increased the Cd content in Solanum nigrum, and the effect was: PASP+PGPR>PASP>PGPR. Compared with the single application of PGPR or PASP, the combined application increased the Cd content in the shoots and shoots of Solanum nigrum by 252.1%-344.1% and 131.3%-312.6%, respectively. From Table 3, it can be concluded that the combined application of microbial inoculants and polyaspartic acid increased the amount of Cd extracted from the shoots and underground parts of Solanum nigrum by up to 8 times, and was significantly higher than single application, indicating that the use of polyaspartic acid The technology of acid and microorganisms combined to assist Solanu...

Embodiment 3

[0039] A method for remediating 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 Solanum nigrum seedlings is as follows: using 0.5% NaClO solution to sterilize the black fruit Solanum nigrum seeds for 20min, rinse with distilled water, rinse the shriveled valleys, and air-dry for later use; then spread the sterilized vermiculite in a tray with a thickness of 4-6cm, in which the Solanum seeds are sown; the vermiculite trays containing the Solanum seeds are placed in the incubator, and after the Solanum seeds germinate, the trays are placed in the cultivation room; the cultivation room uses fluorescent tubes to simulate natural light, and the day-night cycle is 16h Light, 8h dark, relative humidity...

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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 in particular relates to a technology for using polyaspartic acid (PASP) and plant growth promoting bacteria (PGPR) to jointly assist enrichment and phytoremediation of cadmium-contaminated soil. 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, the development of reliable, safe, environmentally friendly and economical methods to control or reduce soil heavy metal pollution has attracted great attention. [0003] Phytoremediation is the most widely used green technology for remediating toxic heavy metal pollution. However, traditional phytoremediation te...

Claims

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Application Information

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Patent Type & Authority Patents(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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