A method for in situ remediation of uranium-contaminated groundwater using indigenous functional microbial communities

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...

AI Technical Summary

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.

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