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Method and reagent for repairing mercury and chromium deep contaminated soil by cooperation of anaerobic sulfate reducing bacteria and iron-based material

A technology for iron-based materials and polluted soil, which is applied in the restoration of polluted soil, chemical instruments and methods, soil conditioning materials, etc., to achieve long-term stable performance, reduced bioavailability, and low cost.

Active Publication Date: 2019-11-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the defects existing in the remediation technology of mercury (II) and chromium (VI) polluted soil in the prior art, the first object of the present invention is to provide a kind of anaerobic sulfate-reducing bacteria synergistic iron-based material which can realize the remediation of mercury (II) and chromium (VI) Ⅱ) and chromium (Ⅵ) deep-contaminated soil with high-efficiency, sustained and stable remediation reagents, the reagent has low cost of raw materials, wide range of sources, easy to obtain, and the mercury (Ⅱ) and chromium (Ⅵ) contaminated soil of mercury (Ⅱ) and chromium (Ⅵ) (Ⅵ) Achieve simultaneous stabilization and fixation, especially suitable for the stable restoration of deep mercury (Ⅱ) and chromium (Ⅵ) contaminated soil

Method used

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  • Method and reagent for repairing mercury and chromium deep contaminated soil by cooperation of anaerobic sulfate reducing bacteria and iron-based material
  • Method and reagent for repairing mercury and chromium deep contaminated soil by cooperation of anaerobic sulfate reducing bacteria and iron-based material
  • Method and reagent for repairing mercury and chromium deep contaminated soil by cooperation of anaerobic sulfate reducing bacteria and iron-based material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The Cr(Ⅵ)-contaminated soil samples with a depth of 20-80 cm were taken from Changsha Chromium Salt Factory. After air-drying and sieving (60 mesh), the Cr(Ⅵ) content in the soil was analyzed, as shown in Table 1.

[0027] Preparation of iron-based materials: Mix oxalic acid and phillips (100g) at a ratio of 2:1, add 600mL of deionized water, heat up to 80°C, and continue stirring for 36 hours. After the reaction is completed, filter, wash and dry to obtain Iron-based materials.

[0028] Cultivation of anaerobic sulfate-reducing bacteria: the bacteria were inoculated in the deoxygenated liquid medium (KH 2 PO 4 0.5g / L, NH 4 Cl 1g / L, CaCl 2 0.1g / L, MgSO 4 ·7H 2 O 2.5g / L, sodium lactate 3.5g / L, pH value is 6.5), growth temperature is 30 ℃, grow to the logarithmic phase and wait for use. Simulated remediation of deep Cr(Ⅵ) contaminated soil: the remediation experiment was divided into four groups A, B, C and D, group A did not add remediation agents (no bacteria or ...

Embodiment 2

[0033] The Cr(Ⅵ) contaminated soil sample is consistent with the sample in Example 1.

[0034] Preparation of iron-based materials: Mix oxalic acid and biotite (50g) at a ratio of 3:2, add 200mL of deionized water, heat up to 90°C, and continue stirring for 6 hours. After the reaction is completed, filter, wash and dry to obtain Iron-based materials.

[0035] Cultivation of anaerobic sulfate-reducing bacteria: the bacteria were inoculated in the deoxygenated liquid medium (KH 2 PO 4 0.5g / L, NH 4 Cl 1g / L, CaCl 2 0.1g / L, MgSO 4 ·7H 2O 2.5g / L, sodium lactate 3.5g / L, pH value is 6.5), growth temperature is 30 ℃, grow to the logarithmic phase before use, the bacterial density in the bacterial liquid is 7*10 8 individual / mL. Simulated remediation of deep Cr(Ⅵ) contaminated soil: the remediation experiment was divided into four groups A, B, C and D, group A did not add remediation agents (no bacteria or iron-based materials), group B added remediation agents It is an iron-ba...

Embodiment 3

[0040] The Hg-contaminated soil samples with a depth of 20-100 cm were taken from Tongren, air-dried and sieved (40 mesh), and the content and form of Hg in the soil are shown in Table 3 and Table 4.

[0041] Preparation of iron-based materials: Mix oxalic acid and iron-aluminum garnet (100g) at a ratio of 2:1, add 600mL of deionized water, heat up to 80°C for 36 hours, and after the reaction is completed, filter, wash and dry to obtain iron base material.

[0042] Cultivation of anaerobic sulfate-reducing bacteria: the bacteria were inoculated in the deoxygenated liquid medium (KH 2 PO 4 0.5g / L, NH 4 Cl 1g / L, CaCl 2 0.1g / L, MgSO 4 ·7H 2 O 2.5g / L, sodium lactate 3.5g / L, pH value is 6.5) to cultivate, the growth temperature is 30 ℃, after growing to the logarithmic phase, it is used for the remediation of contaminated soil.

[0043] Simulated remediation of deep Hg-contaminated soil: the remediation experiments were divided into four groups: A, B, C and D. Group A had no...

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Abstract

The invention discloses a method and reagent for repairing mercury and chromium deep contaminated soil through cooperation of anaerobic sulfate reducing bacteria and an iron-based material. The reagent for repairing the mercury and chromium contaminated soil comprises the iron-based material and anaerobic sulfate reducing bacterial liquid. The iron-based material is obtained by reacting iron-containing silicate minerals with oxalic acid in an aqueous medium. The reagent is applied to mercury (II) and chromium (VI) deep contaminated soil, stabilization of mercury (II) and Cr (VI) is achieved atthe same time, the overall remediation efficiency and range can be effectively improved, the cost is low, operation is easy, secondary pollution to the soil is avoided, and therefore the reagent andthe method have wide application prospects.

Description

technical field [0001] The invention relates to a remediation reagent for chromium-mercury polluted soil, in particular to a remediation reagent for mercury-chromium-contaminated soil by anaerobic sulfate-reducing bacteria in cooperation with iron-based materials, and also relates to the source of mercury (II) and chromium (VI) deep-contaminated soil The invention discloses a site restoration method, which belongs to the technical field of heavy metal pollution restoration. Background technique [0002] Mercury(II) and Cr(VI), as typical heavy metal pollutants, are commonly found in industrially polluted sites after decommissioning, mining and smelting plants, tailings and slag dumps, polluted rivers or lake sediments in various parts of my country. among. [0003] Mercury(II) and Cr(VI) in soil can be divided into dissolved state and exchangeable state, adsorption state, iron and manganese oxidation state, organic binding state and residue state, and the residue state is a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08B09C1/10
CPCB09C1/08B09C1/10C09K17/40
Inventor 贺治国曾强钟慧胡亮
Owner CENT SOUTH UNIV
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