Method for combined remediation of heavy metal polluted soil through castor-humic acid

A technology for synergistic remediation and contaminated soil, applied in the field of contaminated soil treatment, can solve the problems of single application method and little effect of humic acid, and achieve the effects of stabilizing farmers' income, promoting absorption and enhancing transfer rate.

Inactive Publication Date: 2019-02-01
湖南景业检测有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the single application of humic acid, the role of humic acid in the soil is only to repair the soil itself and provide a favorable living environment for plants (while castor itself has strong vitality and adaptability), Little effect on promoting plant uptake of heavy metals

Method used

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  • Method for combined remediation of heavy metal polluted soil through castor-humic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Select farmland

[0031] Select soil heavy metals (take cadmium as an example) in the range of 2-3mg / kg farmland treatment leveling, delineate every 60m 2 Dig 0.5m deep ditches between each plot, and use plastic film to isolate them to control the movement of water and salt;

[0032] 2) Growing castor beans

[0033] Plant castor in the soil after basal application. Sowing density 1 plant / m 2 , Sow 5cm deep.

[0034] The level of field management is consistent. After 60 days of castor growth, representative plants are selected for testing. Measurement items: measure and record the biomass of castor, and measure the content of heavy metal cadmium in roots, stems, and leaves after the yield test.

Embodiment 2

[0036] 1) Select farmland

[0037] Select soil heavy metals (take cadmium as an example) in the range of 2-3mg / kg farmland treatment leveling, delineate every 60m 2 Dig 0.5m deep ditches between each plot, and use plastic film to isolate them to control the movement of water and salt;

[0038] 2) Giving before sowing

[0039] Dilute the humic acid by 500 times, and apply the diluted humic acid to the selected farmland soil. The application amount of humic acid after dilution is 6kg / m 2 .

[0040] 3) Grow castor beans

[0041] Plant castor in the soil after basal application. Sowing density 1 plant / m 2 , Sow 5cm deep.

[0042] The level of field management is consistent. After 60 days of castor growth, representative plants are selected for testing. Measurement items: measure and record the biomass of castor, and measure the content of heavy metal cadmium in roots, stems, and leaves after the yield test.

Embodiment 3

[0044] 1) Select farmland

[0045] Select soil heavy metals (take cadmium as an example) in the range of 2-3mg / kg farmland treatment leveling, delineate every 60m 2 Dig 0.5m deep ditches between each plot, and use plastic film to isolate them to control the movement of water and salt;

[0046] 2) Growing castor beans

[0047] Plant castor in the soil after basal application. Sowing density 1 plant / m 2 , sowing depth 5cm;

[0048] 3) Foliage application at flowering and fruiting stage

[0049]During the castor flower and fruit stage, the humic acid is diluted 1500 times, and the diluted humic acid is applied to the castor leaves. The applied amount of humic acid after dilution is 0.6kg / plant. It was applied every 10 days for a total of 3 applications.

[0050] The level of field management is consistent. After 60 days of castor growth, representative plants are selected for testing. Measurement items: measure and record the biomass of castor, and measure the content of h...

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Abstract

The invention provides a method for combined remediation of heavy metal polluted soil through castor-humic acid. The method comprises following steps that firstly, farmland selection, wherein a farmland with the content of cadmium being 2 to 3 mg/k is selected; secondly, basal application before seeding, wherein humic acid is diluted by 300 to 600 times, and the diluted humic acid is applied to the selected farmland soil; thirdly, castor planting, wherein the castor is planted in the soil obtained after basal application; and fourthly, leaf application in the flower and fruit period, wherein at the flower and fruit period of castor, the humic acid is diluted by 1000 to 1800 times, and the diluted humic acid is applied to castor leaves. The manner of combining humic acid basal application and leaf application is used for planting the castor, the transfer rate of heavy metal in plants can be improved, absorption of castor for cadmium can be promoted, the cadmium pollution in the soil canbe reduced, through the method, cadmium pollution in the soil can be subjected to remediation, and the aim of stabilizing farmer incomes at the soil remediation period can be achieved.

Description

technical field [0001] The invention relates to the field of contaminated soil treatment, in particular to a method for synergistic restoration of heavy metal-contaminated soil by castor-humic acid. Background technique [0002] In recent years, a lot of research work has been done at home and abroad on how to reduce, reduce, or even eliminate heavy metal pollution in large areas of soil, and some achievements have been made. At present, soil heavy metal remediation methods are mainly divided into physical remediation, chemical remediation and biological remediation. The physical remediation method refers to the technology of removing or separating pollutants from the soil through various physical processes, mainly including: soil leaching method, engineering measure method, electrothermal remediation method, etc. The chemical remediation method is to adjust and change the physical and chemical properties of the soil by adding modifiers and inhibitors to the heavy metal-con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
CPCB09C1/00B09C1/105B09C2101/00
Inventor 刘翠芝唐冰
Owner 湖南景业检测有限公司
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