Novel method for in-situ stabilizing repairing of lead polluted sediment by using iron-based material synergistic microbes

A technology for iron-based materials and lead pollution is applied in the field of iron-based materials and microorganisms in the field of remediation reagents for lead-contaminated sediments, reagents for remediation of lead-contaminated sediments, and reagents for remediation of lead-contaminated sediments, to reduce mobility and have application prospects. Expansive, easy-to-use effects

Active Publication Date: 2019-11-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the defects existing in the relevant restoration technology of the existing lead-polluted riverbed mud, the first purpose of the present invention is to provide a reagent for the efficient restoration of lead in the lead-polluted bottom mud by coupling microorganisms with an iron-based material. The raw materials of restoration reagents are low in cost and easy to obtain, and the stability rate of lead to lead-contaminated sediments is above 97%, which is especially suitable for the continuous and stable restoration of lead-contaminated river sediments

Method used

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  • Novel method for in-situ stabilizing repairing of lead polluted sediment by using iron-based material synergistic microbes
  • Novel method for in-situ stabilizing repairing of lead polluted sediment by using iron-based material synergistic microbes
  • Novel method for in-situ stabilizing repairing of lead polluted sediment by using iron-based material synergistic microbes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The lead-contaminated sediment was taken from the Qingshui Pond in the Xiangjiang section of Zhuzhou, and the sample was air-dried and sieved (60 mesh). The basic property analysis is shown in Table 1.

[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 at a ratio of 2:1, place in a reactor, add deionized water according to a liquid-solid ratio of 4:1, seal it, and heat it up to 90°C for 36 hours , after the reaction is completed, wash, filter and dry.

[0032] Culture of sulfate-reducing bacteria: inoculate Desulfovibrio sp.ATCC 7757 in anaerobic medium (KH 2 PO 4 0.5g / L,NH 4 Cl 1g / L, CaCl 2 0.1g / L, MgSO 4 ·7H 2 (2.5g / L, sodium lactate 3.5g / L), the pH value is adjusted to 6.5, when growing to the logarithmic...

Embodiment 2

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

[0039] Preparation of iron-based materials: Mix biotite and oxalic acid dihydrate at a ratio of 3:2, place in a reactor, add deionized water according to a liquid-solid ratio of 5:1, seal it, raise the temperature to 80°C for 12 hours, and react When done, wash, filter and dry.

[0040] Culture of sulfate-reducing bacteria: inoculate Desulfovibrio sp.ATCC 7757 in anaerobic medium (KH2 PO 4 0.5g / L,NH 4 Cl 1g / L, CaCl 2 0.1g / L, MgSO 4 ·7H 2 (2.5g / L, sodium lactate 3.5g / L), the pH value is adjusted to 6.5, when growing to the logarithmic phase, it is ready for use, and the cell density of the bacterial liquid is 3.2*10 8 individual / mL.

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

Embodiment 3

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

[0044] Preparation of iron-based materials: Mix phillips and oxalic acid dihydrate at a ratio of 1:2, place them in a reactor, add deionized water according to a liquid-solid ratio of 4:1, seal, heat up to 90°C for 24 hours, and react When done, 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: inoculate Desulfovibrio sp.ATCC 7757 in anaerobic medium (KH 2 PO 4 0.5g / L,NH 4 Cl 1g / L, CaCl 2 0.1g / L, MgSO 4 ·7H 2 (2.5g / L, sodium lactate 3.5g / L), the pH value is adjusted to 6.5, when growing to the logarithmic phase, it is ready for use, and the cell density of the bacterial liquid is 3*10 8 individual / mL.

[0049] Remediation of lead-contaminated sediments in a simulated anaerobic environment. The repair experiment was carried out in a 10L reactor. 2kg of sediment samples ...

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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 reagent for repairing lead (II) polluted bottom mud, in particular to a reagent for repairing lead (II) polluted bottom mud by iron-based materials in cooperation with microorganisms and a reagent and method for repairing lead (II) polluted bottom mud, belonging to The technical field of ecological restoration of heavy metal polluted soil. Background technique [0002] With the rapid development of the domestic economy and society, the resulting heavy metal pollution has aroused strong concern from all walks of life. Lead is a biologically toxic 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. In China, the annual lead The discharge amount is about 60,000 tons, and the discharge of lead-containing wastewater can easil...

Claims

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Application Information

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Patent Type & Authority Applications(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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