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A method for in-situ stabilization and remediation of lead-contaminated sediment with iron-based materials and microorganisms

An iron-based material and lead-contaminated technology is applied in the fields of iron-based materials and microorganisms for the repair of lead-contaminated sediment, lead-contaminated sediment repair reagents, and lead-contaminated sediment repair reagents to improve bioavailability, The effect of broad application prospects and simple operation

Active Publication Date: 2020-07-31
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the defects existing in the related restoration technology of lead-contaminated river sediment, the first purpose of the present invention is to provide a reagent that can realize the efficient restoration of lead in lead-contaminated sediment by coupling microorganisms with iron-based materials. The cost of reagent raw materials is low, easy to obtain, and the stability rate of lead to lead-contaminated sediment is above 97%, which is especially suitable for the continuous and stable restoration of lead-contaminated river sediment

Method used

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  • A method for in-situ stabilization and remediation of lead-contaminated sediment with iron-based materials and microorganisms
  • A method for in-situ stabilization and remediation of lead-contaminated sediment with iron-based materials and microorganisms
  • A method for in-situ stabilization and remediation of lead-contaminated sediment with iron-based materials and microorganisms

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The lead-contaminated sediment was taken from the sediment of Qingshui Pond in the Xiangjiang section of Zhuzhou, and the samples were air-dried and screened (60 mesh).

[0029] Table 1 Basic properties of sediment

[0030] pH 7.8 Organic carbon (g / kg) 7.88 Organic matter (g / kg) 13.59 Cation exchange capacity CEC (cmol / kg) 21.6 Total lead (mg / kg) 733.68

[0031] Preparation of iron-based materials: mix fayalite and oxalic acid dihydrate in a ratio of 2:1, place them in a reactor, add deionized water according to a liquid-solid ratio of 4:1, seal, heat up to 90 °C for reaction for 36 hours , after the completion of the reaction, washing, filtering and drying.

[0032] Culture of sulfate-reducing bacteria: Desulfovibrio sp. ATCC 7757 was inoculated in anaerobic 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), the pH value is adjusted to 6.5, when it grows to the logarithmic...

Embodiment 2

[0038] The sample is the same as in Example 1.

[0039] Preparation of iron-based material: Biotite and oxalic acid dihydrate were mixed in a ratio of 3:2, placed in a reactor, deionized water was added according to the liquid-solid ratio of 5:1, after sealing, the temperature was raised to 80 ° C for 12 hours, and the reaction When finished, wash, filter and dry.

[0040] Culture of sulfate-reducing bacteria: Desulfovibrio sp. ATCC 7757 was inoculated in anaerobic medium (KH 2 PO4 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), the pH value is adjusted to 6.5, when it grows to the logarithmic phase, the cell density is 3.2*10 8 pcs / mL.

[0041] Remediation of lead-contaminated sediment in a simulated anaerobic environment. The remediation experiments were carried out in a 10L reactor, into which 2kg of sediment samples and 4L of deionized water were successively added, and the reactors were divided into four groups: A, B, C and D. ...

Embodiment 3

[0043] The sample is the same as in Example 1.

[0044] Preparation of iron-based material: phillips and oxalic acid dihydrate were mixed in a ratio of 1:2, placed in a reactor, deionized water was added according to the liquid-solid ratio of 4:1, after sealing, the temperature was raised to 90 °C for reaction for 24 hours. When finished, wash, filter and dry.

[0045] Table 3 Morphological changes of lead-contaminated sediment before and after immobilization reaction

[0046]

[0047]

[0048] Culture of sulfate-reducing bacteria: Desulfovibrio sp. ATCC 7757 was inoculated in anaerobic 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), the pH value is adjusted to 6.5, when it grows to the logarithmic phase for later use, the cell density of the bacterial liquid is 3*10 8 pcs / mL.

[0049] Remediation of lead-contaminated sediment in a simulated anaerobic environment. The remediation experiments were carried ou...

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Abstract

The invention discloses a novel method and a reagent for in-situ stabilizing repairing of lead polluted sediment by using an iron-based material synergistic microbes. The reagent comprises the iron-based material and a sulfate-reducing bacterium solution, and the iron-based material is prepared by reacting an iron-containing silicate mineral with oxalic acid in an aqueous medium at 55-120 DEG C. The reagent is added to the lead-polluted sediment, so the lead immobilization efficiency is 97% or above, the repairing is carried out in situ without an additional device, and the reagent and the method have the advantages of high lead stabilizing efficiency, low cost and no secondary pollution.

Description

technical field [0001] The invention relates to a lead (II) polluted sediment restoration reagent, in particular to a lead (II) polluted sediment restoration reagent and a lead (II) polluted sediment restoration reagent and method for iron-based materials and microorganisms, belonging to The technical field of ecological restoration of heavy metal contaminated soil. Background technique [0002] With the rapid development of domestic economy and society, the problem of heavy metal pollution has attracted strong attention from all walks of life. Lead is a biotoxic heavy metal with a wide distribution and strong accumulation capacity in heavy metal pollution. Lead pollution mainly comes from mining, metal smelting and processing, IT manufacturing, domestic sewage discharge, and the use and combustion of leaded gasoline. The discharge is about 60,000 tons, and the discharge of lead-containing wastewater can easily lead to the deposition of lead in the sediment. [0003] The l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/02C02F11/00C02F101/20
CPCC02F11/008C02F11/02C02F2101/20C02F2103/007
Inventor 贺治国曾强钟慧胡亮
Owner CENT SOUTH UNIV
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