U、 238Pu在砂质含水层中的迁移机制研究

doi:10.11889/j.0253-3219.2019.hjs.42.090301

Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (9): 90301-090301.doi: 10.11889/j.0253-3219.2019.hjs.42.090301

• NUCLEAR CHEMISTRY, RADIOCHEMISTRY, RADIOPHARMACEUTICALS AND NUCLEAR MEDICINE • Previous Articles Next Articles

The adsorption transfer mechanism of U and ²³⁸Pu in sandy aquifers

Chao ZHU Jun ZHANG Aiming CHEN

China Institute for Radiation Protection, Taiyuan 030006, China

Received:2019-05-06 Revised:2019-06-26 Online:2019-09-10 Published:2019-09-18

Abstract

Abstract: Background

The migration of radionuclides carried by water flow in aquifer porous media is a complex physical and chemical process.

Purpose

This study aims to accurately and truly reflect the nuclide transportation in the groundwater by physical experiments and numerical simulation techniques.

Methods

First of all, the sand medium in arid area was taken as the research object, and a soil column device for saturated sandy soil dispersion and permeability test was developed for experimental test. Then, the U and ²³⁸Pu were arranged in the form of liquid point source in the form of liquid point source in the intake section of the soil column, respectively, and the concentration distribution of nuclides in the space of the soil column was measured after the test cycle. Finally, Hydrus-3D was used to establish a three-dimensional numerical model of nuclide migration and to fit the relevant experimental parameters.

Results

The experimental results showed that U migrated downward 24.3 cm along the water flow direction in soil column after 14 days, the distribution coefficient was 35 mL?g^-1, the longitudinal dispersion was 22 cm, and the transverse dispersion was 25 cm. ²³⁸Pu migrated downward 2.1 cm along the water flow direction in soil column after 140 days, the peak concentration was 0.47 ng?cm^-3, the distribution coefficient was 6 500 mL?g^-1, the longitudinal dispersion was 2 cm, and the transverse dispersion was 25 cm. The different migration curves of U and ²³⁸Pu in heterogeneous test soil columns are mainly related to the adsorption and retention of sand media and solutes.

Conclusions

The proposed experimental method for nuclide migration in aquifer porous media can provide support for the study of the migration and transformation in soil media.

Key words: Radionuclide, Migration, Numerical simulation, U, ²³⁸Pu

CLC Number:

Chao ZHU Jun ZHANG Aiming CHEN. The adsorption transfer mechanism of U and ²³⁸Pu in sandy aquifers[J].Nuclear Techniques, 2019, 42(9): 90301-090301.

Figures/Tables 14

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References

1	王哲, 李海峰 . 内蒙高庙子膨润土对放射性核素锶和铯的吸附性能研究[J]. 山东化工, 2015, 44(16): 206-209. DOI: 10.3969/j.issn.1008-021X.2015.16.078 .
1	WANG Zhe , LI Haifeng . Study on adsorption performance of GMZ bentonite from Neimeng province for radioactive strontium and caesium[J]. Shandong Chemical Industry, 2015, 44(16): 206-209. DOI: 10.3969/j.issn.1008-021X.2015.16.078 .
2	李稳, 陈功新, 孙占学, 等 . 某铀尾矿中U、Th在电场作用下释放及迁移规律[J]. 有色金属(冶炼部分), 2019, 15(02): 65-70. DOI: 10.3969/j.issn.1007-7545.2019.02.015 .
2	LI Wen , CHEN Gongxin , SUN Zhanxue , et al . Release and migration of U and Th in uranium tailings under electric field[J]. Nonferrous Metals (Extractive Metallurgy), 2019, 15 (02): 65-70. DOI: 10.3969/j.issn.1007-7545.2019.02.015 .
3	Kanney J F . Numerical simulation and sensitivity analysis of radionuclide transport in a fractured dolomite formation[J]. Developments in Water Science, 2004, 55(04): 1027-1039. DOI: 10.1016/S0167-5648(04)80122-9 .
4	Lim D H , Uchida M , Hatanaka K . Modeling of radionuclide migration through fractured rock in a HLW repository with multiple canisters[J]. Mrs Online Proceedings Library Archive, 2008, 1107: 567-575. DOI: 10.1557/PROC-1107-567 .
5	Maseliene Vaidote , Petro Rimantas . Modelling of coupled groundwater flow and radionuclide transport in crystalline basement using FEFLOW 5.0[J]. Journal of Environmental Engineering & Landscape Management, 2006, 14(2): 101-112. DOI: 10.3846/16486897.2006. 9636886 .
6	邓晓颖, 庹先国 . Pu在板岩与粘土中的动态吸附模拟实验研究[J]. 科技视界, 2014, 40(23): 56-57. DOI: 10.3969/j.issn.2095-2457.2014.23.040 .
6	DENG Xiaoying , Xianguo TUO . Experimental study on dynamic adsorption of Pu in slate and clay[J]. Science & Technology Vision, 2014, 40(23): 56-57. DOI: 10.3969/j.issn.2095-2457.2014.23.040 .
7	岳萍, 庹先国, 冷阳春, 等 . 钙基膨润土对²³⁹Pu核素迁移的阻滞性能研究[J]. 环境科学与技术, 2014, 37(08): 17-20. DOI: 10.3969/j.issn.1003-6504.2014.08.004 .
7	YUE Ping , Xianguo TUO , LENG Yangchun , et al . Retardation capability of Ca-bentonite on migration of ²³⁹Pu[J]. Environmental Science & Technology, 2014, 37(08): 17-20. DOI: 10.3969/j.issn.1003-6504.2014.08.004 .
8	Volkova E , Iooss B , Van Dorpe F . Global sensitivity analysis for a numerical model of radionuclide migration from the RRC Kurchatov Institute radwaste disposal site[J]. Stochastic Environmental Research & Risk Assessment, 2008, 22(1): 17-31. DOI: 10.1007/s00477-006-0093-y .
9	Chen J J , Zhang J L , Wang H Q . Numerical modeling on radionuclide migration adsorbed bysuspended matter in estuary[J]. Marine Environmental Science, 2003, 22(2): 28-32. DOI: 10.1007/s11769-003-0089-1 .
10	Merk R . Numerical modeling of the radionuclide water pathway with HYDRUS and comparison with the IAEA model of SR 44[J]. Journal of Environmental Radioactivity, 2012, 105(2): 60-69. DOI: 10.1016/j.jenvrad.2011.10.014 .
11	王榕树 . 放射性核素在地质介质中的迁移研究[J]. 核化学与放射化学, 1994, 16(2): 117-118.
11	WANG Rongshu . The study on radionuclide migration in geologic media[J]. Journal of Nuclear and Radiochemistry, 1994, 16(2): 117-118.
12	彭志娟, 李寻, 陈经明, 等 . 处置单元核素¹³⁵Cs迁移数值模拟研究[J]. 地下水, 2018, 40(06): 113-116. DOI: 10.3969/j.issn.1004-1184.2018.06.040 .
12	PENG Zhijuan , LI Xun , CHEN Jingming , et al . Numerical simulation study on migration of nuclide ¹³⁵Cs in disposal unit[J]. Ground Water, 2018, 40(06): 113-116. DOI: 10.3969/j.issn.1004-1184.2018.06.040 .
13	Pauline M , Daniele L P , Bassam G . Uranium and noble gas isotopes to decipher naturally-occcuring radionuclide release into aquifers[C]. EGU General Assembly 2017,Vienna, 2017.
14	Sandhu D , Singh A , Duranceau S J . Fate and transport of radioactive gypsum stack water entering the Floridan aquifer due to a sinkhole collapse[J]. Scientific Reports, 2018, 8(1): 710. DOI: 10.1016/j.scitotenv.2018.07.181 .
15	Zhao P P , Xu Z , Sun C X . Experimental study of conservative solute transport in heterogeneous aquifers[J]. Environmental Earth Sciences, 2017, 76(12): 421. DOI: 10.1007/s12665-017-6734-2 .

矿物成分	石英	云母	斜长石	钾长石	绿泥石	角闪石	方解石	高岭石	未检出
Mineral composition	Quartz	Mica	Plagioclase	Potassium feldspar	Chlorite	Amphibole	Calcite	Kaolinite	Absence
砂土Sand	50~55	6	15~20	7	3	—	10~15	2	1

含水率 Water content	吸力值（cmH₂O） Soil suction
0.009 4	315
0.031 3	210
0.052 3	140
0.071 6	103
0.092 1	84
0.134 4	62
0.173 5	40
0.204 9	1

核素Nuclide	区域Zone
	峰值迁移距离Distance of peak / cm		峰值浓度Concentration of peak
	U	²³⁸Pu	U / μg?cm^-3	²³⁸Pu / ng?cm^-3
1	18.9	2.7	6.96	0.45
2	18.9	2.7	7.03	0.46
3	24.3	2.5	7.12	0.46
4	24.3	2.4	7.06	0.47
5	18.9	2.7	7.03	0.47
6	24.3	1.8	7.07	0.48
7	24.3	2.1	7.03	0.47

测压管编号Manometer number No.	坐标Coordinate		实测水头Measured value / cm	计算水头Calculated value / cm
测压管编号Manometer number No.	x / cm	z / cm	实测水头Measured value / cm	计算水头Calculated value / cm
1	0	8	18.42	21.20
2	15	8	16.00	16.75
3	30	8	9.15	12.30
4	45	8	5.33	7.68
5	15	2	18.51	22.75
6	15	14	7.11	10.75

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The adsorption transfer mechanism of U and ²³⁸Pu in sandy aquifers

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