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Heavy metal fixing agent and in-situ repair method for heavy metal contaminated soil

A technology of contaminated soil and in-situ remediation, applied in the restoration of contaminated soil, etc., can solve problems such as soil heavy metal pollution, achieve stable fixation effect, reasonable mass concentration, and reduce heavy metal content

Active Publication Date: 2016-03-02
湖南中金岭南康盟环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a heavy metal fixative and an in-situ repair method for heavy metal-contaminated soil to solve the technical problem of heavy metal pollution in soil

Method used

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  • Heavy metal fixing agent and in-situ repair method for heavy metal contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The iron-containing compound Fe 2 (SO 4 ) 3 Mix it with a sulfur-containing compound solution (tri-sodium trimercaptotriazine) to obtain a heavy metal fixative. The mass concentration of the sulfur-containing compound solution is 15%, and the solid-liquid ratio of Fe in the iron-containing compound to the sulfur-containing compound solution is controlled to be 1:2. Add 0.5 L of heavy metal fixative and 5 g of lime to 5 kg of heavy metal contaminated soil. After one month, the effective state of heavy metals in the heavy metal-polluted soil was analyzed by DTPA leaching.

[0048] Before remediation with heavy metal fixatives, the effective concentrations of Cd and Pb in the soil were 17.26mg / kg and 402.50mg / kg respectively; after remediation with heavy metal fixatives, the effective concentrations of Cd and Pb in soil were 0.19mg / kg and 7.29mg / kg, the fixation rates of Cd and Pb in the soil are 98.90% and 98.19% respectively, which meet the requirements of the seconda...

Embodiment 2

[0050] The difference with Example 1 is that in Example 2, the mass concentration of the sulfur-containing compound solution is 10%, the solid-liquid ratio of Fe and the sulfur-containing compound solution in the heavy metal fixative is controlled to be 1:1, and the mass ratio of lime to soil is 1 :100.

[0051] The iron-containing compound Fe 2 (SO 4 ) 3 Mix with the sulfur-containing compound solution to obtain a heavy metal fixative, the mass concentration of the sulfur-containing compound solution is 10%, and the solid-liquid ratio of Fe in the heavy metal fixative to the sulfur-containing compound solution is controlled to be 1:1. Add 0.4L of heavy metal fixative and 50g of lime to 5kg of heavy metal-contaminated soil. After one month, the effective state of heavy metals in the heavy metal-polluted soil was analyzed by DTPA leaching.

[0052] Before remediation with heavy metal fixatives, the effective concentrations of Cd and Pb in the soil were 17.26mg / kg and 402.50...

Embodiment 3

[0054] The difference from Example 1 is that in Example 3, the solid-to-liquid ratio of Fe and the sulfur-containing compound solution in the heavy metal fixative is controlled to be 1:20, and the mass ratio of lime to soil is 1:500.

[0055] The iron-containing compound FeCl 2 Mix with the sulfur-containing compound solution to obtain a heavy metal fixative, the mass concentration of the sulfur-containing compound solution is 30%, and the solid-liquid ratio of Fe in the heavy metal fixative to the sulfur-containing compound solution is controlled to be 1:20. Add 0.25 L of heavy metal fixative and 10 g of lime to 5 kg of heavy metal contaminated soil. After one month, the effective state of heavy metals in the heavy metal-polluted soil was analyzed by DTPA leaching.

[0056] Before remediation with heavy metal fixatives, the effective concentrations of Cd and Pb in the soil were 17.26mg / kg and 402.50mg / kg respectively; after remediation with heavy metal fixatives, the effecti...

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Abstract

The invention discloses a heavy metal fixing agent and an in-situ repair method for heavy metal contaminated soil. The heavy metal fixing agent comprises sulphur-containing compound solution and an iron-containing compound, wherein iron element in the iron-containing compound is mixed with the sulphur-containing compound solution in a solid-liquid ratio of 1kg: 20L to 1kg: 1L to obtain the heavy metal fixing agent. According to the heavy metal fixing agent, the liquid-solid ratio of the iron-containing compound to the sulphur-containing compound solution is proper, the mass concentration of the sulphur-containing compound solution is reasonable, and trithione triazine trisodium salt can form a stable vulcanization-chelation coprecipitate with heavy metal ions in soil, thus achieving the effect of fixing heavy metals; and the iron-containing compound is conducive to weaken combination of plant root system secretion and the heavy metals in soil, and stabilize the effect of fixing the heavy metals. The heavy metal fixing agent is capable of fixing the many heavy metal ions in soil simultaneously, high in the stability of fixing for the heavy metals, and capable of reducing the contents of the heavy metals in soil in a short time.

Description

technical field [0001] The invention relates to the field of remediation of heavy metal polluted soil, in particular to a heavy metal fixative. In addition, the present invention also relates to an in-situ remediation method of heavy metal polluted soil comprising using a heavy metal fixative. Background technique [0002] With the development of industry and the modernization of agricultural production, heavy metal pollution has become a major problem that endangers the quality of the global environment. Heavy metal pollution in soil has the characteristics of long-term, concealment and irreversibility. Once the soil is polluted by heavy metals, subsequent treatment will be very difficult. Therefore, the improvement and remediation of heavy metal-contaminated soil has become an important research content in the fields of soil science and environment. [0003] At present, the remediation technologies of heavy metal-contaminated soil mainly include engineering remediation, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 周康根姜科彭佳乐杨有才潘希贤
Owner 湖南中金岭南康盟环保科技有限公司
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