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Heavy metal soil leaching composition containing organic acid and application thereof and remediation method for heavy metal soil

A soil leaching and composition technology, applied in the restoration of polluted soil, application, organic fertilizers, etc., can solve the problems of difficult to achieve the purpose of removing heavy metals in the soil, lack of soil dissolution and dispersion, and achieve a good leaching environment , Overcoming the difficulty of rinsing, the effect of environmental protection ingredients

Inactive Publication Date: 2021-03-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disclosed compound leaching agent can effectively remove heavy metals in the sedimentation sludge produced by urban water treatment, but it is used for leaching of general soil, lacks the dissolution and dispersion of soil, and it is difficult to achieve the purpose of removing heavy metals in soil

Method used

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  • Heavy metal soil leaching composition containing organic acid and application thereof and remediation method for heavy metal soil
  • Heavy metal soil leaching composition containing organic acid and application thereof and remediation method for heavy metal soil
  • Heavy metal soil leaching composition containing organic acid and application thereof and remediation method for heavy metal soil

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Embodiment approach

[0021] According to a preferred embodiment of the present invention, the organic phosphonate is selected from the group consisting of sodium aminotrimethylene phosphonate, sodium ethylenediamine tetramethylene phosphonate, sodium diethylenetriamine pentamethylene phosphonate and hydroxyethylidene diphosphonate at least one of sodium phosphonates.

[0022] According to a preferred embodiment of the present invention, the organic acid is at least one selected from oxalic acid, tartaric acid, citric acid and fulvic acid.

[0023] The second aspect of the present invention provides the application of the above-mentioned composition in repairing heavy metal soil. The organic acid-containing heavy metal soil leaching composition of the present invention is particularly suitable for repairing heavy metal polluted soil.

[0024] The third aspect of the present invention provides a method for repairing heavy metal soil, the method comprising: using the organic acid-containing heavy me...

Embodiment 1

[0037] The composition and content of each component of the heavy metal soil leaching composition containing organic acid are shown in Table 1.

[0038] The heavy metal soil leaching composition containing an organic acid is dissolved in water and diluted to 600 g to obtain a heavy metal soil compound leaching agent.

[0039] Take 120g of the heavy metal soil sample to be repaired to fill the leaching column, control the leaching rate to 1.5mL / min, use 600g of heavy metal soil compound leaching agent containing organic acid to leaching the heavy metal soil to be repaired, and take the soil after rinsing is completed The sample was dried, digested and the heavy metal content was measured, which were copper 661mg / kg, cadmium 31.4mg / kg, lead 582mg / kg. The removal rates of heavy metals are listed in Table 2.

Embodiment 2

[0041]According to the method of Example 1, the difference is that the composition and the content of each component of the heavy metal soil leaching composition containing organic acid are shown in Table 1. After leaching, the heavy metal content in the soil sample was: copper 471mg / kg, cadmium 30.3mg / kg, lead 445mg / kg. The removal rates of heavy metals are listed in Table 2.

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Abstract

The invention relates to the field of remediation of heavy metal-contaminated soil, and discloses a heavy metal soil leaching composition containing organic acid, application of the heavy metal soil leaching composition and a remediation method for heavy metal soil. The composition comprises Tween, organic phosphonate and organic acid, wherein a mass ratio of Tween to organic phosphonate to organic acid is (0.5-10): (0.5-8): 1. The organic acid-containing heavy metal soil leaching composition provided by the invention can create a good leaching environment and is environment-friendly in components and high in heavy metal removal efficiency.

Description

technical field [0001] The invention relates to the field of remediation of heavy metal polluted soil, in particular to a heavy metal soil leaching composition containing an organic acid, an application thereof and a method for remediation of heavy metal soil. Background technique [0002] With the rapid development of industry, soil pollution by heavy metals continues to increase, land resources are destroyed, and the process of social development is seriously hindered. The corresponding soil remediation technology came into being, which can be roughly divided into three categories: physical remediation, chemical remediation and biological remediation. In addition to the traditional methods of soil removal, soil dumping, and soil replacement, physical restoration also includes electrokinetic methods, electrothermal restoration, vitrification technology, and frozen soil technology; chemical restoration is based on soil properties and heavy metal types, and the selection of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/18B09C1/02B09C1/08
CPCB09C1/02B09C1/08C09K17/18
Inventor 郦和生胡永丰秦会敏谢文州
Owner CHINA PETROLEUM & CHEM CORP
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