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Method for repairing heavy metal polluted soil using abundant plant dandelion

A technology of polluted soil and dandelion, which is applied in the field of phytoremediation of heavy metal-contaminated soil, can solve the problem that the heavy metal content in the aboveground part of the plant exceeds a certain critical content, and achieve the goal of not causing secondary pollution, preventing wind erosion, and reducing repair costs Effect

Inactive Publication Date: 2009-04-15
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

[0017] 4) The enrichment factor of a certain heavy metal in the aboveground part of the plant (the average value of the stem, leaf and inflorescence) is greater than 1, but it does not meet the standard that the heavy metal content in the aboveground part of the plant (stem and leaf) exceeds a certain critical content

Method used

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  • Method for repairing heavy metal polluted soil using abundant plant dandelion
  • Method for repairing heavy metal polluted soil using abundant plant dandelion

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1 Pot concentration gradient test

[0031]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, which 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.

[0032] A total of 6 treatments were set up in the test, which were the 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 add...

Embodiment 2

[0041] Example 2 Enrichment characteristics of heavy metals in dandelion in mining polluted area

[0042] The Qingchengzi lead-zinc mine in Fengcheng, Liaoning 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 674.4 mm. The main host rocks in the mining area are marble and mica schist, and the soil is brown loam. The vegetation cover is 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. Since dandelion is an occasional species, the plant sampling method is to pick one by one.

[0043] The dandelion plants collected in the lead-zinc mining area with serious Cd pollution did not show symptoms of poisoning from the appearance characteristics. The results of physical and chemical properties and Cd content...

Embodiment 3

[0047] Example 3. The enrichment characteristics of dandelion in sewage irrigation area to Cd

[0048] Shenyang Zhangshi Sewage Irrigation District is located in the western suburbs of Shenyang, about 30km away from the Shenyang Ecological Station of the Chinese Academy of Sciences. Since 1962, due to the unreasonable use of Cd-containing industrial sewage from Shenyang Weigong open channel to irrigate rice fields, most of the farmland in the irrigation area has been polluted. According to the survey in 1975, the soil is mainly polluted by Cd and Cd is mainly distributed on the soil surface (about 0-35cm) , the area of ​​land polluted by Cd is about 2800hm 2 , the concentration of Cd in the soil in seriously polluted areas is 5-7mg / kg. When the dandelion was mature, the random sampling method was used to collect the soil samples of the plants and their root zones in Zhangshi irrigation area, Shenyang.

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Abstract

The invention relates to a phytoremediation technology for soil contaminated by heavy metal, in particular to a method for remediating soil contaminated by cadmium through the heavy metal enriching plant of dandelion. The method for remediating the soil contaminated by heavy metal through the heavy metal enriching plant of dandelion comprises the following steps: dandelion is implanted in the soil containing the cadmium pollutant; a great amount of cadmium in the contaminated oil is absorbed by the root system of dandelion and is transferred to the organs of the above-ground part of dandelion; and the plant grows to have the above-ground part with maximal biomass, the organs of the above-ground part of the plant are removed from the contaminated soil, thereby realizing the aim of removing the cadmium pollutant in the soil. The technology controls the soil contaminated by cadmium through the heavy metal enriching plant of dandelion, and has the advantages of low cost, strong operability, no damage on the physicochemical property of the soil, no induction of secondary pollution, good effects on preventing the wind and water erosion of the contaminated soil, and the like.

Description

technical field [0001] The invention relates to a phytoremediation technology for heavy metal-contaminated soil, in particular to a method for remediating heavy metal-contaminated soil by using the enriched plant dandelion. 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 heavy metal-contaminated soil caused by industrial sewage irrigating farmland. The representative example is the earliest discovered, large-scale, and seriously polluted soil in Zhangshi Irrigation District, Shenyang. 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 Irrig...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/10
Inventor 魏树和周启星
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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