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Method for repairing Cd contaminated soil by using Cruciferae plant

A cadmium-contaminated soil and phytoremediation technology, applied in the field of remediating cadmium-contaminated soil with cruciferous plants, to achieve good water erosion, low cost, and strong operability

Inactive Publication Date: 2006-01-18
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because when the concentration of heavy metals in the soil is high enough to exceed the critical content standard that hyperaccumulator plants should reach, or even several times higher, the accumulation of heavy metals in plants has the characteristics of increasing with the concentration of heavy metals in the soil [Document 9: Guo Shuiliang, Huang Chaobiao, Bian Yuan, Lin Guoping. 2002. Absorption and enrichment of heavy metal elements in soil by weeds in the suburbs of Jinhua (I)-Analysis of the content of 6 heavy metal elements in weeds and soil. Journal of Shanghai Jiao Tong University (Agricultural Science Edition), 20 (1): 22-29], although the accumulation of heavy metals in plants has reached the recognized critical content standard, when the heavy metal concentration in the soil is slightly lower than the content standard that hyperaccumulator plants should reach, The accumulation of heavy metals in plants may be difficult to reach the critical content standard of hyperaccumulator plants and show the same characteristics as ordinary plants. Ordinary plants may also grow normally in the presence of high concentrations of heavy metals, so the surface characteristics of greater tolerance displayed by those plants may also be an artifact

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1 Pot concentration gradient test

[0014] The test site is located in the Shenyang Ecological Experiment Station of the Chinese Academy of Sciences. The geographical location is 123°41' east longitude, 41°31' north latitude, and an altitude of about 50m. There is no pollution source around the test station, and it is an uncontaminated area of ​​heavy metals. The station is located in the center of the southern part of the Songliao Plain, about 35km away from the urban area of ​​Shenyang. Volume 520~544KJ / cm 2 , the frost-free period is 127-164 days, and the annual precipitation is 650-700mm. The pot test was collected from the topsoil (0-20cm) of the station, and the soil type was meadow brown soil.

[0015] A total of 6 treatments were set up in the test, which were control (CK, no Cd) and 5 different Cd dosing concentration tests, Cd dosing concentration: 10mg / kg (R1), 25mg / kg (R2), 50mg / kg(R3), 100mg / kg(R4), 200mg / kg(R5), the form of heavy metal added...

Embodiment 2

[0023] Embodiment 2 Community simulation test

[0024] The test site is also located at the Shenyang Ecological Experiment Station of the Chinese Academy of Sciences, with an area of ​​8m 2 (L=4M, W=2M), the basic physical and chemical properties of the soil are the same as the potting soil. The concentration of Cd in the plot soil is 50mg / kg, and the form of Cd added is CdCl 2 2.5H 2 O, is an analytically pure reagent, added in solid state. The specific operation is as follows: on June 25, 2003, the soil of the plot was dug out, and the excavation depth was 50 cm, which could ensure that the root system of the conifers all grew in the Cd-contaminated soil. The excavated soil was naturally air-dried and passed through a 4mm sieve, and then the soil was roughly divided into two equal parts, one of which was added with heavy metal Cd, and the other was backfilled as a control area without Cd added. When adding heavy metals, first divide the air-dried soil into equal parts, 3...

Embodiment 3

[0030] Example 3 Test of natural growth phytoremediation effect in polluted area

[0031] Two polluted areas were selected. One is the Qingchengzi lead-zinc mine in Fengcheng, Liaoning, which is located at 123°37' east longitude and 40°41' north latitude. The annual average temperature of the mining area is 6.5-8.7°C, and the precipitation is 674.4mm. The main parent rocks in the mining area are marble and mica schist, and the soil is brown loam. The vegetation covers mainly secondary forests, sparse shrubs and some artificial metasequoia and black locust forests. The elevation of each pit mouth of the ore body is about 270-405m, and the mining site is about 180-390m from the ground. mine. As the coniferia is an occasional species, the plant sampling method is to pick one by one.

[0032] Another polluted area is the Shenyang Zhangshi Sewage Irrigation Area, which is located in the western suburbs of Shenyang, about 30km away from the Shenyang Ecological Station of the Chin...

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Abstract

The present invention relates to plant repair technique for polluted environment particular to use cone fieldcress with super accumulation / super enrich of Cruciferae to repair Pd-polluted soil. Plant fieldcress on the Pd-polluted soil, when blossoming or maturing, move the plant to come to purpose. The root system of fieldcress absorbs lots of Pd and transfers them to top organ of stem and leaf. Move the fieldcress on proper time and plant next crop; repeat the process. Thereby, it brings away and gets rid of lots of above-norm Pd quickly and exhaustively.

Description

technical field [0001] The invention relates to a phytoremediation technology for polluted environment, in particular to a method for remediating cadmium-contaminated soil by using cruciferous plants. Background technique [0002] There are usually two ways for heavy metals to pollute soil: one is the environmental pollution caused by metal mining activities. Serious soil; heavy metal polluted soil caused by leaching and other reasons during the mining waste rock stacking process; soil pollution caused by mine wastewater containing high concentrations of heavy metals, etc. The second is the heavy metal-contaminated soil caused by industrial sewage irrigating farmland. The representative one is the earliest, large-scale and seriously polluted soil in Shenyang Zhangshi Irrigation District. The main heavy metal pollutant is Cd [Document 1: Wu Yan Yu, Chen Tao, Zhang Xuexun. 1986. Research on the Pollution Ecology of Cadmium in Zhangshi Irrigation District, Shenyang. See: Gao Z...

Claims

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Application Information

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IPC IPC(8): B09C1/10
Inventor 周启星魏树和
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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