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Phytoremediation method for soil with cadmium pollution

A cadmium-contaminated soil and phytoremediation technology, applied in the restoration of polluted soil, etc., can solve the problems of slow physical methods, affecting the export of agricultural products, reducing international competitiveness, etc., to accelerate the rate of phytoremediation, improve bioavailability, The effect of promoting absorption and enrichment

Active Publication Date: 2014-12-31
FARMLAND IRRIGATION RES INST CHINESE ACAD OF AGRI SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second is to affect food safety and threaten human health
The third is to affect the export of agricultural products and reduce international competitiveness
Physical methods are slow to take effect, while chemical methods are fast but easily cause secondary pollution

Method used

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  • Phytoremediation method for soil with cadmium pollution
  • Phytoremediation method for soil with cadmium pollution
  • Phytoremediation method for soil with cadmium pollution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Plant ryegrass in the cadmium-contaminated soil, water the soil so that the soil humidity reaches 80% of the field water holding capacity, add EDTA before harvest; the addition of EDTA is 1mmol / kg, The soil cadmium content before restoration was 45mg / kg, and the soil cadmium content after restoration was 40.13mg / kg.

Embodiment 2

[0032] Plant ryegrass in cadmium-contaminated soil, water the soil so that the soil moisture reaches 60% of the field water capacity, and add organic acid when growing for 30 days; the organic acid added is oxalic acid, and the amount of oxalic acid added is 3mmol / kg. The soil cadmium content before restoration was 55mg / kg, and the soil cadmium content after restoration was 42.9mg / kg. Embodiments of the present invention are further described below through a list:

[0033] Table 1

[0034]

[0035] Wherein, the organic acid concentration refers to the added amount of the organic acid.

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Abstract

The invention discloses a phytoremediation method for soil with cadmium pollution. The method comprises the following steps: ryegrass is planted in soil with cadmium pollution; organic acid is added before harvest, and the organic acid is one selected from ethylene diamine tetraacetic acid, oxalic acid, glacial acetic acid, propane diacid, tartaric acid or malic acid. In the method, based on ryegrass as a biomass raw material, when the ryegrass is used to restore the soil with cadmium pollution, through activation and induction actions of the organic acid, the bio-availability of heavy metal cadmium is raised, absorption and enrichment of cadmium of plants are promoted, and therefore the phytoremediation speed of soil with heavy metal pollution is raised. In addition, the organic acid can promote increase of amount of dry matter of overground parts and root systems of ryegrass to some extent, and finally, long-term goals of harmony of soil productivity restoration and local landscapes, ecological balance and sustainable development are achieved.

Description

technical field [0001] The invention relates to bioremediation technology of polluted soil, in particular to a method for phytoremediation of polluted soil. Background technique [0002] Our country is facing a double crisis of resource-based and water-quality-based water shortages. In the case of water shortages, in order to ensure agricultural production, many places passively use sewage for irrigation. According to the survey by the Ministry of Water Resources, the area irrigated with sewage in my country was 46 million mu in 1991, and reached 54.27 million mu in 2004, accounting for about 7.3% of the total irrigated area in the country. A large amount of untreated sewage is directly used for farmland irrigation. Although it solves the urgent need of water shortage in some areas, it pays a high price for it. Sewage irrigation causes pollutants, especially heavy metals, to remain in the soil in large quantities, directly affecting the structure and function of the soil ec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/08
Inventor 乔冬梅齐学斌樊向阳胡超赵志娟李中阳胡艳玲
Owner FARMLAND IRRIGATION RES INST CHINESE ACAD OF AGRI SCI
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