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Method for restoring cadmium polluted soil by using amaranth

A cadmium-contaminated soil and cadmium-contaminated technology, applied in the field of cadmium pollution control, can solve the problems of small biomass, slow growth rate, and few species, and achieve the effects of rapid growth, low cost, and strong environmental adaptability

Inactive Publication Date: 2008-01-02
SUN YAT SEN UNIV
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AI Technical Summary

Problems solved by technology

There are very few cadmium hyperaccumulator species found so far, among which Thlaspi caerulescens can enrich 2130mg kg -1 , but the plant still has the disadvantages of small biomass and slow growth in practical applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: amaranth is 7.68mg kg in cadmium content -1 The absorption characteristics of Cd in the soil

[0013] This experiment was carried out in Qingyuan City, Guangdong Province, and the soil cadmium content was 7.68mg kg -1 . The planting time was May 2004. Amaranth seeds were sown into the soil of the test area, and 80 plants were reserved per square meter when the seedlings were settled. Water regularly according to the needs of growth, and take samples after 40 days of growth.

[0014] The test results show that the cadmium content is 7.68mg kg -1 In the soil of the experimental area, the average cadmium content in the aboveground part of amaranth reached 115.7-141.8mg kg -1 , the average value reaches 128.7mgkg -1 , reaching the critical content standard that cadmium hyperaccumulator plants should meet, that is, the cadmium content in the aboveground part is greater than 100mg kg -1 , and the cadmium content in the aboveground part is 158-226% of the ...

Embodiment 2

[0015] Embodiment 2: application amaranth to cadmium content is 10.25mg kg -1 soil for bioremediation

[0016] This experiment was carried out in Heshan City, Guangdong Province, and the cadmium content in the control soil was 0.12mg kg -1 , the test soil cadmium content is 10.25mg kg -1 . The planting time was July 2006. Amaranth seeds were sown in the control and test soils, converted to 120 seeds per square meter. Thin out the seedlings after 10 days, and keep 100 plants per square meter. After 20 days, the seedlings were settled, and 80 plants were reserved per square meter. Water regularly according to the needs of growth, and take samples after 42 days of growth.

[0017] The test results show that when the cadmium content is 10.25mg kg -1 In the test soil, the cadmium content in the aboveground part of amaranth reached 101.45-114.72mg kg -1 , the average value reached 106.55mg kg -1 , reaching the critical content standard that cadmium hyperaccumulator plants s...

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Abstract

The invention discloses a method of repairing pollution soil by amaranth. As amaranth is planted in soil polluted by cadmium amaranth root adsorbs cadmium from pollution soil in large amount and amaranth is transferred to stem and leaf of cadmium so on. When the plant grows to flower period or mature period the upper part plant is transferred away from pollution soil so as to realize the purpose that cadmium is removed from pollution soil.

Description

technical field [0001] The invention relates to cadmium pollution control technology, in particular to a method for repairing cadmium-polluted soil by using amaranth. Background technique [0002] With the rapid development of the economy and the increase of human industrial and agricultural production activities, the problem of soil heavy metal pollution has become increasingly serious. Sewage irrigation, sludge application, atmospheric deposition of dust containing heavy metals, use of agrochemicals containing heavy metals, mining and smelting activities around farmland are the main causes of heavy metal pollution in farmland soil in my country. [0003] At present, the soil in the suburbs of most cities in my country has been polluted by heavy metals to varying degrees. According to relevant data, in 1980, the national industrial "three wastes" polluted 2.667 million ha of farmland 2 , increased to 6.667 million hm in 1988 2 , and in 1992, the area of ​​farmland pollut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/10A01C21/00F23G7/10
Inventor 杨中艺周轶慧王俊丽袁剑刚薛梦
Owner SUN YAT SEN UNIV
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