Method for repairing cadmium-pollution farmland soil

A technology for cadmium-contaminated soil and farmland, applied in the field of phytoremediation of heavy metal pollution in the environment, can solve the problems of slow growth of hyperaccumulator plants, insufficient plant variety resources, strong regionality, etc., and achieve low cost, strong vitality, and sustainable highly operable effect

Inactive Publication Date: 2014-11-19
SICHUAN AGRI UNIV
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AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide water centipede in Cd polluted farmland soil remediation in view of the above-mentioned shortage of plant species resources that can be used for soil Cd polluted phytoremediation and problems such as the slow growth rate of hyperaccumulator plants, small biomass, and strong regionality that have been found. Applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] pot experiment

[0023] The test site is located in the net room with rainproof facilities in the teaching and research park of Sichuan Agricultural University.

[0024] Adopt the method of potted simulation soil Cd pollution, water centipede ( Kyllinga brevifolia Rottb) seedlings were transplanted into potting soil supplemented with Cd. This experiment started in June 2013. The transplanted water centipede was collected from Daxing Town, Yucheng District, Ya'an City, Sichuan Province. There were 4 plants in each pot and 3 repetitions. The added concentration is 2 mg kg -1 (Cd1), 10 mg kg -1 (Cd2), 25 mg kg -1 (Cd3), 50 mg kg -1 (Cd4) and 200 mg kg -1 (Cd5), the form of added Cd is CdCl 2 2.5H 2 O, for analytically pure reagents, added to the soil in the form of a solution, mixed thoroughly, and used after 4 weeks of equilibrium. The plants are cultivated in the net room, and watered from time to time according to the actual situation of soil moisture to ...

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Abstract

The invention relates to the technical field of phytoremediation for heavy metal pollution in the environment, in particular to a method for repairing cadmium-pollution farmland soil. The method comprises the steps that shortleaf kyllinga herb is planted in the Cd-pollution farmland soil, the obvious enrichment characteristics of the shortleaf kyllinga herb for heavy metal Cd are utilized, heavy metal Cd in a farmland is absorbed and accumulated, one part of the heavy metal Cd is transferred to plants on the ground with the heavy metal Cd, ashing treatment is carried out on the regularly-harvested plants on the ground, or the plants on the ground and plants under the ground are harvested at the same time, then ashing treatment is carried out on the plants, and therefore the aim that the Cd-pollution farmland soil is repaired is achieved. Through the experimental study, an inventor finds that the shortleaf kyllinga herb has the obvious enrichment characteristics for Cd. The enrichment characteristics of the shortleaf kyllinga herb for the Cd are utilized, and therefore the Cd can be absorbed and accumulated, one part of the Cd is transferred to the plants on the ground, ashing treatment is carried out on the regularly-harvested plants on the ground, or harvesting and ashing treatment are carried out on the plants under the ground at the same time, and the aim of repairing the Cd-pollution farmland soil is achieved.

Description

technical field [0001] The invention relates to the technical field of phytoremediation of heavy metal pollution in the environment, that is, using a Cyperaceae plant [0002] Plants are used to remediate heavy metal cadmium pollution in soil, specifically, the plant water centipede is used to remediate heavy metal cadmium-contaminated soil in farmland. [0003] Background technique [0004] Soil is the natural environment on which human beings depend and an important resource for agricultural production. Soil pollution seriously hampers agricultural production in many developed and developing countries. Soil heavy metal pollution caused by human activities is one of the important environmental problems that need to be solved urgently in the world. The natural purification process of heavy metals in the soil is very long. Once the soil is polluted, the harm will be long-term, not only seriously endangering crop production, but also endangering the health of humans and ani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 李廷轩余海英张锡洲郑子成王永东刘涛戢林郝小青
Owner SICHUAN AGRI UNIV
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