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Device and method for restoring uranium-polluted soil by adopting comprehensive united technology

A combined technology and uranium pollution technology, which is applied in the field of all-round combined technology to repair uranium-contaminated soil, can solve the problems of not too high nuclide concentration, secondary cross-contamination of the environment, and high treatment costs, so as to achieve a clean and efficient treatment process. Short cycle, good safety effect

Active Publication Date: 2014-07-16
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most countries adopt the following methods: physical method, chemical method, electrochemical method, physical-chemical method, microbial removal method and soil nuclear pollution removal method, but these methods have high processing costs and are likely to cause secondary crossover to the environment. Pollution cannot fundamentally solve the problem of nuclide removal
Although the forest restoration method can repair polluted soil in a large area, and can develop industrial raw material forests and firewood forests, the concentration of nuclides required by it should not be too high, so its application is greatly restricted

Method used

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  • Device and method for restoring uranium-polluted soil by adopting comprehensive united technology
  • Device and method for restoring uranium-polluted soil by adopting comprehensive united technology
  • Device and method for restoring uranium-polluted soil by adopting comprehensive united technology

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Using the above device to remediate uranium-contaminated soil, the specific steps are as follows:

[0041] Step 1: Conduct a site survey on the radioactive uranium-contaminated soil to be treated, obtain the area of ​​the contaminated soil, hydrogeological conditions, pollutant types, and physical and chemical properties data, so as to determine the pollution situation.

[0042] Step 2: Install an all-round combined technology device for repairing uranium-contaminated soil at the uranium-contaminated soil, so that the cathode, anode, suction pipe 3 and recharge pipe 4 are inserted under the soil surface 21, and the spray device 10 is located at the uranium-contaminated soil. Above the soil; at this time, ensure that the suction pipe 3 and the recharge pipe 4 pass through the phreatic layer of the soil by 0.95m, and the cathode and anode are 12m deep into the surface of the polluted soil, tangent to the phreatic layer of the soil.

[0043] Step 3: Spray the citric acid s...

Embodiment 2

[0054] The specific operation method is the same as in Example 1, but the applied voltage and repair time of electric repair are changed, and the analysis is performed at different voltages (200V, 300V, 400V, 500V, 600V) and different electric repair times (2, 4, 6, 8 days) Under this condition, the change of uranium removal efficiency in soil was detected by inductively coupled plasma-atomic emission spectrometry (ICP-AES), and the results were as follows image 3 shown. It can be seen that increasing the voltage and prolonging the electrokinetic repair time will help the removal efficiency of uranium in the soil, and when the voltage is 500V and the electrokinetic repair time is 8d, the highest restoration efficiency is 82.9%.

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Abstract

The invention discloses a device and a method for restoring a uranium-polluted region by adopting the comprehensive united technology, belonging to the field of uranium-polluted environment restoring technologies. The device is composed of a suction system, an electrokinetic remediation system, a leaching system, a restoring separation system and a reinjection system; the chemical technology, the electrokinetic remediation technology and the photolysis restoration technology are combined to restore the uranium-polluted region in a united manner; the method comprises the steps of extracting the pollutant-uranium from the uranium-polluted region to enable uranium in an ionic state to be extracted into a solution phase from a soil phase; adopting the electrokinetic remediation technology to drive the soil pollutant-uranium to be enriched nearby an anode; and sucking polluted groundwater in a phreatic layer, and carrying out photolysis restoration and separation to the polluted groundwater and the polluted soil, backfilling the restored soil nearby the anode region, and recharging the restored groundwater into a recharge well. The restoration device adopting the comprehensive united technology can effectively reduce the content of uranium in polluted soil and groundwater, can recycle the uranium, and has a clean treatment process without secondary pollution.

Description

technical field [0001] The invention relates to the technical field of uranium-contaminated environment restoration, in particular to a device and method for all-round joint technology restoration of uranium-contaminated soil. Background technique [0002] With the continuous acceleration of uranium resource exploration and mining in my country, a large number of uranium tailings and uranium waste ores have been produced. At present, the special storage facility for uranium tailings is the uranium tailings pool. According to incomplete statistics, the total amount of uranium tailings in the world has reached 20 billion tons. Since the 1940s in my country, a large number of radionuclides such as uranium in active or decommissioned uranium tailings ponds have been ingested into groundwater and diffused with the flow of groundwater, causing serious harm to groundwater and the ecological environment. Uranium is mainly a source of alpha rays (uranium-235 is 4.679MeV, uranium-23...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCG21F9/001B01J19/127B09C1/02B09C1/08G21F9/28G21F9/30
Inventor 卢宏玮任丽霞何理
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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