Method for repairing cadmium polluted soil by utilizing enrichment plant bidens tripartita

Abstract

The invention relates to plant repairing technology of cadmium polluted soil, in particular to a method for repairing cadmium polluted soil by utilizing enrichment plant bidens tripartita. Bidens tripartita is planted on soil containing pollutant cadmium, the root system of bidens tripartita absorbs cadmium in polluted soil and transfers the cadmium to the overground part organ, the overground part organ is taken away from the polluted soil when the overground part organ of the plant grows to biomass liveweight maximum, thus realizing the aim of removing pollutant cadmium in soil. The invention utilizes enrichment plant bidens tripartita to treat cadmium polluted soil and has the advantages of low cost, strong operability, no destroy on soil physicochemical properties, no arising of secondary pollution and good effect on preventing wind erosion and water erosion of polluted soil.

Description

technical field

[0001] The invention relates to a phytoremediation technology for soil polluted by heavy metals, in particular to a method for remediating cadmium-contaminated soil by using the enrichment plant wolfberry grass. 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 I...

Examples

Embodiment 1

[0028] Embodiment 1 pot test

[0029] 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.

[0030] According to the status and level of heavy metal pollution in Northeast China, the single pollution of Cd (T 1 ) and Cd-Pb-Cu-Zn compound pollution (T 2) 2 groups of experiments, in which the concentration of Cd single pollution treatment is 10mg / kg, and the concentration o...

Embodiment 2

[0040] Embodiment 2 Pot concentration gradient test

[0041] A total of 5 treatments were set up in the test, which were the control (CK, no Cd added) and 4 different Cd dosing concentration tests, Cd dosing concentration: 10mg / kg (R1), 25mg / kg (R2), 50mg / kg(R3), 100mg / kg(R4), the form of cadmium added is CdCl 2 2.5H 2 O, for analytically pure reagents, fully mixed, equilibrated for two weeks before use.

[0042] The experiment started in spring, and the seedlings were transplanted from the Shenyang Ecological Station, with 2 plants in each pot and repeated 3 times. Outdoor cultivation. According to the lack of water in the pot, water it irregularly (Cd was not detected in the water), so that the soil water content is often kept at about 80% of the field water capacity. Harvest when the plants are mature.

[0043] The test results are as follows:

[0044] Under different Cd concentration treatment conditions, compared with the control (CK 2 ), the biomass of the aboveg...

Embodiment 3

[0049] Example 3. The enrichment characteristics of Cd in the sewage irrigation area

[0050] 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. Random sampling method was used to collect soil samples of plants and their root zone in Shenyang Zhangshi irrigation area when Yulangcao was mature.

[0051] The test results are as follows:

[0052] Judging from the appearance characteristics, the w...

technical field

[0001] The invention relates to a phytoremediation technology for soil polluted by heavy metals, in particular to a method for remediating cadmium-contaminated soil by using the enrichment plant wolfberry grass. 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 I...

Examples

Embodiment 1

[0028] Embodiment 1 pot test

[0029] 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.

[0030] According to the status and level of heavy metal pollution in Northeast China, the single pollution of Cd (T 1 ) and Cd-Pb-Cu-Zn compound pollution (T 2) 2 groups of experiments, in which the concentration of Cd single pollution treatment is 10mg / kg, and the concentration o...

Embodiment 2

[0040] Embodiment 2 Pot concentration gradient test

[0041] A total of 5 treatments were set up in the test, which were the control (CK, no Cd added) and 4 different Cd dosing concentration tests, Cd dosing concentration: 10mg / kg (R1), 25mg / kg (R2), 50mg / kg(R3), 100mg / kg(R4), the form of cadmium added is CdCl 2 2.5H 2 O, for analytically pure reagents, fully mixed, equilibrated for two weeks before use.

[0042] The experiment started in spring, and the seedlings were transplanted from the Shenyang Ecological Station, with 2 plants in each pot and repeated 3 times. Outdoor cultivation. According to the lack of water in the pot, water it irregularly (Cd was not detected in the water), so that the soil water content is often kept at about 80% of the field water capacity. Harvest when the plants are mature.

[0043] The test results are as follows:

[0044] Under different Cd concentration treatment conditions, compared with the control (CK 2 ), the biomass of the aboveg...

Embodiment 3

[0049] Example 3. The enrichment characteristics of Cd in the sewage irrigation area

[0050] 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. Random sampling method was used to collect soil samples of plants and their root zone in Shenyang Zhangshi irrigation area when Yulangcao was mature.

[0051] The test results are as follows:

[0052] Judging from the appearance characteristics, the w...

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