Method for treating plutonium or strontium polluted soil

A technology of polluted soil and treatment method, which is applied in the field of radionuclide plutonium or strontium contaminated soil, can solve the problems that are not suitable for large-scale treatment of plutonium or strontium micro-contaminated soil, unsatisfactory treatment effect, secondary pollution, etc., and achieve soil The effect of complete restoration of quality, low cost of treatment, and efficient removal

Inactive Publication Date: 2010-06-23
CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] It can be seen that the treatment process of radionuclides in slightly polluted soil at home and abroad is not yet mature. The traditional physical and chemical treatment methods have many problems such as high cost, unsatisfactory treatment effect, and easy to cause secondary po

Method used

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  • Method for treating plutonium or strontium polluted soil
  • Method for treating plutonium or strontium polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Activated acidophilus Thiobacillus thiooxidans (A.t bacteria): A.t bacteria activation medium formula is 0.20gCaCl 2 2H 2 O, 0.50g MgSO 4 ·7H 2 O, 3.50g KH 2 PO 4 , 0.40g (NH 4 ) 2 Fe(SO 4 ) 2 ·6H 2 O, add tap water to 1000mL, adjust the pH value to 3.5-4.0, sterilize under 0.1MPa steam pressure for 30min, and cool. Spread 10.0 g of sulfur powder finely ground through a 60-mesh sieve in a sterile box (chamber) and sterilize it at a distance of 30 cm from the ultraviolet lamp for 30 minutes, and then add it to the sterilized solution above. Take A.t bacteria activation medium 150mL in a 500mL Erlenmeyer flask, draw 20mL A.t bacteria active bacteria solution into the activation medium, and then place it in a constant temperature shaker at 28-32°C for shaking culture. Gradually reduce the inoculum size in the same way and carry out transfer culture for 14 days. After repeated transfer culture and filtration, the active bacterial liquid of A.t bacteria (microbi...

Embodiment 2

[0038] 1) Activation of acidophilic Thiobacillus thiooxidans (A.t bacteria): Same as Example 1.

[0039] 2) Activation of sulfate-reducing bacteria (SRB bacteria): same as in Example 1.

[0040] 3) Preparation of reaction medium rich in iron and sulfur: (NH 4 ) 2 SO 4 2.50g, KH 2 PO 4 2.50g, MgSO 4 ·7H 2 O 0.50g, CaCl 2 2H 2 O 0.25g, FeSO 4 ·7H 2 O 7.00g, sulfur powder 4.85g, pyrite powder 3.00g, add tap water to 1000mL and mix well.

[0041] 4) Preparation of solubilizing aids: Na 2 S 2 o 3 ·5H 2 O 22.00g, DTPA 21.80g, formic acid 14.00mL, citric acid 9.50g, ammonium phosphate 0.40g, EDTA-Na 2 13.25g, organic fertilizer 24.20g, add tap water to 1000mL and mix well.

[0042] 5) Sieving and volume reduction of plutonium-238 slightly polluted soil: Same as Example 1.

[0043]6) In the microbial dissolution-promoting reactor (4), the active bacterial liquid of A.t bacteria and the solubilizing aid are mixed in a ratio of 1.0:1.75 (v / v), and the 111.11g soil / 100mL...

Embodiment 3

[0050] 1) Activation of acidophilic Thiobacillus thiooxidans (A.t bacteria): Same as Example 1.

[0051] 2) Activation of sulfate-reducing bacteria (SRB bacteria): same as in Example 1.

[0052] 3) The preparation of the reaction medium rich in iron and sulfur: the medium formula is (NH 4 ) 2 SO 4 2.50g, KH 2 PO 4 2.50g, MgSO 4 ·7H 2 O 0.50g, CaCl 2 2H 2 O 0.25g, FeSO 4 ·7H 2 O 4.00g, sulfur powder 2.10g, pyrite powder 3.50g, add tap water to 1000mL and mix well.

[0053] 4) Take strontium-90 slightly polluted soil and pass it through iron grid sieve, double plate sieve and spiral sieve in sequence, and after sifting out larger particle size soil particles, the soil particles with particle size less than 0.25mm are the contaminated soil to be treated after volume reduction.

[0054] 5) In the microbial dissolution-promoting reactor (4), put the strontium-90 slightly polluted soil into the soil by the amount of 144.93g soil / 100mL A. The reaction medium was put in, a...

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Abstract

The invention belongs to the technical field of microbe, and particularly relates to a method for treating radionuclide plutonium or strontium polluted soil by microbe. The method comprises the following steps: screening the plutonium or strontium polluted soil by a bar screen, a double-plate screen and a spiral screen, wherein the soil grains with the granularity of more than 0.25 millimeter are clean soil grains and the soil grains with the granularity of less than 0.25 millimeter are plutonium or strontium polluted soil grains; and mixing the soil grains with the granularity of less than 0.25 millimeter and acidithiobacillus thiooxidans active solution, filtering the solution to obtain sediment which is clean soil, mixing the filtered solution and sulfate reducing bacteria active solution, settling plutonium or strontium, filtering and separating the solution, reclaiming the plutonium or the strontium, and recycling the water. The method of the invention has the advantages of simple and convenient operation, economy and feasibility and high safety, has no secondary pollution, and can efficiently and quickly remove the plutonium or the strontium from the polluted soil.

Description

technical field [0001] The invention belongs to the technical field of microorganisms, and in particular relates to a method for treating soil polluted by radionuclide plutonium or strontium with microorganisms. Background technique [0002] Activities such as mining operations, national defense scientific research activities, disposal of radioactive waste, and the gradual opening of nuclear weapon testing bases have led to increasingly serious environmental radioactive pollution. Among them, the treatment and remediation of contaminated soil containing radionuclides has attracted increasing attention. The International Radiation Protection Commission, the International Atomic Energy Agency, the U.S. Environmental Protection Agency, the U.S. Nuclear Regulatory Commission, and the U.S. National Security Agency have successively formulated remediation standards for radionuclide-contaminated soil, and my country’s remediation standards are also under discussion. There are many...

Claims

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Application Information

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IPC IPC(8): B09C1/10C12N1/20
Inventor 袁世斌董微李娜
Owner CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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