Method of using native function microflora to in-situ purify ground water polluted by uranium

A technology of functional microorganisms and microbial communities, applied in the field of in-situ restoration, can solve problems such as large interference of chemical components, difficult secondary treatment, secondary environmental pollution, etc., achieve low operating costs, easy control of the treatment process, and no secondary pollution Effect

Active Publication Date: 2013-05-08
NANHUA UNIV
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Problems solved by technology

The bentonite method has the advantages of large processing capacity and low cost, but for water bodies with extremely low uranium concentrations, other chemical components interfere greatly and the efficiency is low
[0004] To sum up, using traditional or new methods to treat low-concentration uranium-contaminated groundwater has disadvantages such as difficult secondary treatment, easy to cause secondary environmental pollution, or either inefficient or expensive.

Method used

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  • Method of using native function microflora to in-situ purify ground water polluted by uranium

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specific Embodiment approach

[0045] A method for in-situ remediation of uranium-contaminated groundwater using indigenous functional microbial communities, the specific steps of which are:

[0046] (1) Uranium-contaminated groundwater samples and soil collection

[0047] The uranium-contaminated groundwater is collected in the monitoring well of the uranium tailings pond, and the soil is collected next to the monitoring well for anaerobic preservation.

[0048] (2) Activation of indigenous functional microorganisms

[0049] with 30 mM NaHCO 3 The solution adjusts the pH of the uranium-contaminated groundwater to a range of 6.5-7.5, and then mixes the soil and the uranium-contaminated groundwater after the pH adjustment in a jar, adds carbon source materials, and passes through nitrogen to exhaust oxygen. A rubber stopper and a sealing film are used to seal the mouth of the jar, and then the jar is left to stand anaerobically, in the dark and at a constant temperature to activate the indigenous functiona...

Embodiment 1

[0055] Example 1, in an anaerobic bioreactor, add 1 L of uranium-contaminated groundwater with a uranium concentration of 0.462 mg / L and 50 g of fresh soil (water content 42%), add 4.5 g of glucose as a carbon source, and improve the function of the native The microbial community was continuously regulated, and the uranium concentration in the uranium-contaminated groundwater in the anaerobic bioreactor decreased to 0.040 mg / L after 75 days.

Embodiment 2

[0056] Example 2, in the anaerobic bioreactor, adding 1 L of uranium-contaminated groundwater with a uranium concentration of 0.462 mg / L and 50 g of fresh soil (water content 42%), adding 5 g of glucose as a carbon source, and affecting the native function The microbial community was continuously regulated, and the uranium concentration in the uranium-contaminated groundwater in the anaerobic bioreactor decreased to 0.037 mg / L after 105 days.

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Abstract

The invention relates to a method of using native function microflora to in-situ purify ground water polluted by uranium. The method translates transferable hexavalent uranium into nontransferable uranous uranium in the ground water through nitrate reducing bacteria flora, ferric iron reducing bacteria flora and sulfate reducing bacteria flora which are formed under the anaerobic condition by microorganism, and therefore the purpose of purifying the ground water polluted by the uranium is achieved. The specific implementation method comprises: (1) adjusting a potential of hydrogen (Ph) value of the ground water polluted by the uranium; (2) activating the microorganism in sediments; (3) regulating and controlling variation of the microflora, accelerating evolution of the nitrate reducing bacteria flora, the ferric iron reducing bacteria flora and the sulfate reducing bacteria flora by means of adding a carbon source, regulating oxidation reduction potential of the water polluted by the uranium and the like; (4) continuously regulating and controlling the microbial flora until uranium concentration in the ground water polluted by the uranium is reduced below the national emission standard and the purpose of purifying the groundwater polluted by the uranium is achieved. The method of using the native function microflora to in-situ purify the ground water polluted by the uranium solves in-situ purifying problem of the ground water polluted by the uranium, and has the advantages of being high in purifying efficient, short in period, simple in equipment, short in process procedure, low in purifying cost, strong in operability, free of secondary pollution, good in purifying effect and the like.

Description

technical field [0001] The invention relates to the technical field of in-situ restoration of uranium-contaminated groundwater in environmental governance, specifically an in-situ restoration of uranium that converts U(VI) in uranium-contaminated groundwater into U(IV) and fixes it through indigenous functional microbial communities methods of polluting groundwater. Background technique [0002] With the rapid development of our country's economy, nuclear energy, as an important energy source, has been paid more and more attention by people. As the main nuclear fuel of nuclear energy, uranium is being mined and smelted more and more. In situ leaching has become one of the main methods of uranium mining. In this method, the leaching solution is injected into the ore layer through the drilling engineering, so that it contacts with the uranium component in the heterogeneous ore to carry out chemical reaction. The soluble uranium compound produced by the reaction leaves the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/18
Inventor 丁德馨胡南李广悦谭翔徐飞王永东
Owner NANHUA UNIV
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