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Method for repairing heavy metal pollution soil using abundant plants butter weed

A technology of small liquor grass and polluted soil, 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 no secondary pollution, good water erosion, and low cost Effect

Inactive Publication Date: 2009-03-25
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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 pollution soil using abundant plants butter weed
  • Method for repairing heavy metal pollution soil using abundant plants butter weed
  • Method for repairing heavy metal pollution soil using abundant plants butter weed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 Potted plant concentration gradient test

[0030] The test site is located in the Shenyang Ecological Experimental 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 a heavy metal unpolluted area. The station is located in the central area of ​​the southern Songliao Plain, about 35km away from Shenyang City. It has a temperate semi-humid continental climate, with an average annual temperature of 5-9℃, and an annual active accumulated temperature greater than 10℃ of 3100-3400℃, with total annual radiation. 520~544KJ / cm 2 , Frost-free period is 127~164d, annual precipitation is 650~700mm. The pot experiment was collected from the top soil (0-20cm) of the station, and the soil type was meadow brown soil.

[0031]There are 6 treatments in the experiment, which are control (CK, no Cd) and 5 different Cd conce...

Embodiment 2

[0045] Example 2 Concentration characteristics of heavy metals by Diwort in mining contaminated area

[0046] 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℃, 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 soil. The vegetation cover is mainly secondary forests and 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 location is about 180-390m away from the ground. The grade of lead-zinc ore is about 70-80%. Cd is mainly associated with sphalerite crystal lattice, with an average grade of about 0.034%, but it is not formed separately. mine. The sampling of plants is the sampling method of seeing one plant and picking one plant.

[0047] The white winegrass plants collect...

Embodiment 3

[0051] Example 3. Cd enrichment characteristics of Dioschia diffusa in sewage irrigation area

[0052] 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 contaminated. According to a survey in 1975, the soil is mainly contaminated by Cd and Cd is mainly distributed on the surface of the soil (about 0~35cm) , The area of ​​land contaminated by Cd is about 2800hm 2 , The Cd concentration of soil in more polluted areas is 5-7mg / kg. Random sampling was used to collect plants and soil samples from their roots in the Zhangshi Irrigation District of Shenyang when the wine grass was mature.

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Abstract

The invention relates to a renovating technique for heavy metal polluting soil with plants, in particular to a method for renovating heavy metal polluting soil by utilizing an enrichment plant of Conyza canadensis. The Conyza canadensis is planted in soil containing pollutant cadmium, and the root system of the Conyza canadensis can absorb abundant cadmium in the polluted soil and transfer the cadmium to the overground organs; when the plant growths until the overground biomass is the most, the overground organs of the plant are moved away from the polluted soil, thereby the purpose of removing the pollutant cadmium in the soil can be realized. The invention utilizes the enrichment plant Conyza canadensis to govern the cadmium polluted soil, and has the advantages that the expense is low, and the maneuverability is strong, the physicochemical property of the soil is not damaged, secondary pollution can not be caused, and the effect of preventing aeolian erosion and water erosion of the soil are good, and the like.

Description

Technical field [0001] The present invention relates to a phytoremediation technology for heavy metal contaminated soil, in particular to a method for remediating heavy metal contaminated soil by using an enriched plant Diwort. Background technique [0002] There are usually two ways to pollute soil by heavy metals: one is environmental pollution caused by metal mining activities. The main types of pollution are heavy metal pollution caused by long-term effects of water, gas, heat and other environmental factors in the soil around the pit. Severe soil; heavy metal pollution of the soil caused by leaching during the stacking process of mining waste rock; pollution of the soil caused by mining wastewater with higher concentrations of heavy metals, etc. The second is the heavy metal pollution of soil caused by industrial sewage irrigated farmland. The representative is my country’s earliest discovery of soil pollution in Zhangshi Irrigation District of Shenyang, which has a large ar...

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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