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Method for restoring soil polluted by heavy metal cadmium by using mesquite

A cadmium-contaminated soil and heavy metal technology, applied in the field of soil pollution control, can solve problems affecting the growth and development of non-repaired plants, secondary pollution of soil or water environment, and lack of plant nutrition

Inactive Publication Date: 2011-06-15
ZHONGKAI UNIV OF AGRI & ENG +1
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Problems solved by technology

However, chelating agents such as EDTA are not easy to degrade in the environment, and their presence in the soil will seriously affect the growth and development of non-remediation plants; in addition, their solubilization and flow-enhancing effects on substances in the soil will lead to the degradation of target heavy metals and other non-target metals. After activation, it transfers to deep soil or groundwater, causing secondary pollution of soil or water environment and increasing the difficulty of restoration; moreover, since most chelating agents are non-specific in binding to metal elements, they activate heavy metals at the same time It also activates other trace elements in the soil, such as Fe, Mn, Ca, Mg, etc., which increases the leaching loss of these elements, which may lead to plant nutrient deficiency, which is very unfavorable to plant growth

Method used

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  • Method for restoring soil polluted by heavy metal cadmium by using mesquite
  • Method for restoring soil polluted by heavy metal cadmium by using mesquite
  • Method for restoring soil polluted by heavy metal cadmium by using mesquite

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Experimental program
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Embodiment Construction

[0018] 1. Simulation of heavy metal polluted soil

[0019] Four experimental designs (CdNO 3 ) 2 Treatment group, (CdNO 3 ) 2 The concentrations in the soil were 5mg / kg, 25mg / kg, 50mg / kg and 100mg / kg respectively, and a control group with or without Cd was established.

[0020] Three EDTA treatment groups were designed in the experiment, the concentration of EDTA in the soil was 0.0mmol / kg, 0.2mmol / kg and 0.5mmol / kg respectively, and the concentration of EDTA added to the soil was 5mg / kg, 25mg / kg and 50mg / kg respectively. and 100mg / kg (CdNO 3 ) 2 In the treatment group, each treatment concentration of Cd was treated with 3 treatment concentrations of EDTA respectively, each treatment concentration was repeated 10-15 times, and a control group without EDTA was set at the same time.

[0021] See Table 1 for the treatment concentration of each reagent and its corresponding code.

[0022] Table 1 Cd(NO 3 ) 2 Comparison table of treatment concentration codes with EDTA

[...

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Abstract

The invention discloses a method for restoring soil polluted by heavy metal cadmium by using mesquite, comprising the following steps: 1) planting Cassia alata Linn plants on soil polluted by the heavy metal cadmium; and 2) adding ethylenediamine tetraacetic acid into the soil as a fortifier while planting the Cassia alata Linn plants. Legume used in the invention has the advantages of fast growth, large biomass and the like, overcomes the deficiency of current accumulator plant, and is suitable for restoring soil polluted byheavy metal cadmium.

Description

technical field [0001] The invention relates to the field of soil pollution control, and more specifically, the invention relates to a method for repairing soil polluted by heavy metal cadmium by using leguminous shrubs. Background technique [0002] Soil is an important natural resource for the survival and development of human society. However, with the rapid development of industry and agriculture and the intensification of urbanization, the pollution of soil environment in my country is becoming more and more serious. Among them, soil heavy metal pollution is a hot issue of global concern. At present, the area of ​​cultivated land polluted by heavy metals in my country is nearly 2×10 7 m 2 , accounting for about 1 / 5 of the total arable land area, resulting in an annual grain production reduction of 1×10 7 Many tons, the food polluted by heavy metals reaches 1.2×10 every year 7 tons, the annual economic loss is at least 2×10 7 Yuan. Heavy metal elements are generally...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00
Inventor 高丽霞郑志民卢炜峰陈铭杰
Owner ZHONGKAI UNIV OF AGRI & ENG
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