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Method for restoring cadmium polluted soil by Thalia dealbata

A technology of cadmium-contaminated soil and re-flowering, which is applied in the field of ecological restoration of cadmium-contaminated soil, to achieve the effect of pollution resistance and purification ability, obvious effect and strong operability

Inactive Publication Date: 2014-11-05
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the existing technology for cadmium-contaminated soil remediation technology, and provide a method for remediating heavy metal cadmium-contaminated soil with low cost, strong operability, and environmental friendliness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The test site is located at the Yuejin North Teaching and Research Farm of South China Agricultural University.

[0020] Potted plants were used to simulate soil heavy metal pollution, and the test was carried out as a greenhouse potted test. The soil is air-dried, mixed thoroughly, passed through a 1 cm sieve, and filled with 8 kg of soil per pot. Pollutants are CdCl 2 ·5H 2 O (analytical grade) formulated as CdCl 2 Aqueous solution, mass fractions are 0, 1, 10 and 25 mg·kg -1 , were denoted as CK, Cd1, Cd2 and Cd3 respectively, and each treatment was repeated 4 times. After adding the Cd solution to the test soil, irrigate it with deionized water, stir well and keep the soil layer of each pot with about 2 cm of water layer so that Cd can be fully distributed in the soil layer, and transplant the crops after 20 days of equilibrium. When transplanting, select plants with consistent growth, and transplant 2 plants per pot, and select individuals with plant height (1...

Embodiment 2

[0026] The test site is located in the teaching and research farm of South China Agricultural University.

[0027] Zailihua is a kind of emergent flower with high ornamental value newly introduced to my country in recent years, and it is mainly planted in some cities in South China. Healthy seedlings can be purchased directly from the market, with a plant height of about 15cm. The present invention is also applicable to other conventional Zailihua varieties, and therefore does not limit the scope of the present invention.

[0028] Potted plants were used to simulate heavy metal pollution in soil, and the test was carried out in the form of a large potted plant in a greenhouse. The soil was air-dried, mixed thoroughly, passed through a 1 cm sieve, and 8 kg of cadmium-contaminated paddy soil was placed in each pot. The cadmium content in the soil was tested to be 1.89 mg·kg -1 , is a mild pollution type. In the cadmium-contaminated rice soil, Zailihua with a plant height of a...

Embodiment 3

[0030] The test site is located in the teaching and research farm of South China Agricultural University.

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Abstract

The invention relates to the technical field of ecological restoration of cadmium polluted soil, and concretely relates to a method for restoring cadmium polluted soil by Thalia dealbata. Researches find that Thalia dealbata can normally grow in high concentration cadmium environment, the biomass of the Thalia dealbata does not obviously decrease, the heavy metal content of the aboveground part of the Thalia dealbata is higher than the heavy metal content of the root part of the Thalia dealbata, and Thalia dealbata can adsorb cadmium in soil. Thalia dealbata is planted in the heavy metal cadmium polluted soil, so when Thalia dealbata plants are mature, the aboveground parts of the plants (a certain height of the basal parts of the plants are reserved) are cut, harvested and removed from the polluted soil; and after the base parts or the underground parts of the plants have new buds and the new buds gradually grow to form new mature plants, the above processes are repeated in order to reduce the pollutant cadmium in soil.

Description

technical field [0001] The invention relates to the technical field of ecological restoration of cadmium-contaminated soil, specifically discloses a method for repairing cadmium-contaminated soil by using Zailihua, more specifically a low-cost, highly operable, and environmentally friendly Zailihua single-use restoration method Methods of contamination of soil with heavy metal cadmium. Background technique [0002] According to relevant data, the area of ​​heavy metal pollution in China's cultivated land accounts for about 1 / 6 of the total cultivated land. Among the 8 kinds of soil heavy metal elements, the probability of Cd pollution is 25.2%, which is far higher than that of other soil heavy metal elements. Cd pollution directly leads to crop yield reduction and excessive Cd in food. In 2012, 200 rice samples were taken from Guangdong Province, East China, Central China, Northeast China, Northwest China, and Southwest China. The results showed that the Cd content in 200 s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/10
Inventor 章家恩梁开明傅玲杨滔郭靖赵本良罗明珠
Owner SOUTH CHINA AGRI UNIV
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