Method for treating radioactive cesium-137 polluted soil

A technology of polluted soil and treatment method, which is applied in the field of radioactive cesium slightly polluted soil, and can solve the problems of limited efficiency of physical decontamination, secondary pollution, etc.

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

AI Technical Summary

Problems solved by technology

[0007] To sum up, the treatment process of radionuclides in slightly polluted soil at home and abroad is not yet mature, and the existing research has the following problems: first, the efficiency of physical decontamination is limited, and second, the chemical leaching method is easy to cause secondary pollution

Method used

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  • Method for treating radioactive cesium-137 polluted soil
  • Method for treating radioactive cesium-137 polluted soil
  • Method for treating radioactive cesium-137 polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1) Activated acidophilic Thiobacillus ferrooxidans (A.f bacteria): the activation medium formula is 0.40g KCl, 0.50g MgSO 4 ·7H 2 O, 0.10g Ca(NO 3 ) 2 4H 2 O, 0.01g CuSO 4 ·5H 2 O, 0.10g KH 2 PO 4 , 0.40g (NH 4 ) 2 Fe(SO 4 ) 2 ·6H 2 O, 990 mL tap water. Adjust the pH value to 2.0-2.3, sterilize under 0.1MPa steam pressure for 30min, and cool down. Then 10 mL of 30% FeSO 4 Separately filter sterilize and add to the above solution which has been sterilized. Take 150mL of activation medium in a 500mL Erlenmeyer flask, draw 20mL of the active bacteria liquid of A.f bacteria and add it to the activation medium, and then place it in a constant temperature shaker at 28-32°C for shaking culture for 14 days. Gradually reduce the amount of inoculum in the same way and carry out transfer culture. After repeated transfer culture and filtration, the active bacterial liquid of A.f bacteria (microbial biomass is 10 ~ 15g / L) is obtained.

[0016] 2) Activated sulfate-re...

Embodiment 2

[0028] 1) Activation of acidophilic Thiobacillus ferrooxidans (A.f bacteria): Same as Example 1.

[0029] 2) Activation of sulfate-reducing bacteria (SRB bacteria): same as in Example 1.

[0030] 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 8.20g, sulfur powder 4.65g, pyrite powder 4.55g, add tap water to 1000mL and mix well.

[0031] 4) Volume reduction by sieving cesium-137 slightly polluted soil: same as in Example 1.

[0032] 5) In the microbial dissolution-promoting reactor (4), cesium-137 micro-polluted soil is dropped into by the amount of 105.26g soil / 100mLA. The reaction culture medium of sulfur is put into the microbiological solubilization reactor (4), ventilated and stirred at 25-35° C. for 10-14 days (120 r / m), and sampled and analyzed.

[0033] 6) Backfill the soil with cesium-137 content up to the standard in the sedimentation part of the m...

Embodiment 3

[0039] 1) Activation of acidophilic Thiobacillus ferrooxidans (A.f bacteria): Same as Example 1.

[0040] 2) Activation of sulfate-reducing bacteria (SRB bacteria): same as in Example 1.

[0041] 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 6.80g, sulfur powder 3.45g, pyrite powder 3.85g, add tap water to 1000mL and mix well.

[0042] 4) Volume reduction by sieving cesium-137 slightly polluted soil: same as in Example 1.

[0043] 5) In the microbial dissolution-promoting reactor (4), cesium-137 slightly polluted soil is dropped into by the amount of 111.11g soil / 100mLA. The reaction culture medium of sulfur is put into the microbiological solubilization reactor (4), ventilated and stirred at 25-35° C. for 10-14 days (120 r / m), and sampled and analyzed.

[0044] 6) Backfill the cesium-137 content of the sedimentation part in the microbe solubilization reac...

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Abstract

The invention relates to a method for treating radioactive cesium micro-polluted soil. The method comprises the following steps: screening out coarse soil particles from the radioactive cesium micro-polluted soil by adopting a bar screen, a double-plate screen and a spiral screen, and then mixing the volume-reduced radioactive cesium micro-polluted soil and active bacteria liquid of acidithiobacillus ferrooxidans in a microbial dissolution promoting reactor to promote the dissolution of the radioactive cesium in the micro-polluted soil to a liquid phase; transferring the radioactive cesium containing solution to a microbial adsorption precipitation reactor, and further precipitating the radioactive cesium transferred to the liquid phase by adjusting the pH value and using active bacteria liquid of sulfate reducing bacteria; filtering the treated soil suspension and recycling the water; and reducing the volume of the sludge adsorbing the radioactive cesium. The method has the advantages of simple and convenient operation, economy, feasibility, high safety, no secondary pollution to the ecological environment, and capacity of efficiently and quickly removing the radioactive cesium from the micro-polluted soil.

Description

technical field [0001] The invention belongs to the technical field of environmental microorganisms, and in particular relates to a method for treating radioactive cesium slightly polluted soil. 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 treatment and re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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