| Co-Investigator(Kenkyū-buntansha) |
矢永 誠人 静岡大学, 理学部, 准教授 (10246449)
宇都宮 聡 九州大学, 理学(系)研究科(研究院), 准教授 (40452792)
高橋 嘉夫 東京大学, 理学(系)研究科(研究院), 教授 (10304396)
難波 謙二 福島大学, 共生システム理工学類, 教授 (70242162)
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| Budget Amount *help |
¥41,860,000 (Direct Cost: ¥32,200,000、Indirect Cost: ¥9,660,000)
Fiscal Year 2017: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
Fiscal Year 2016: ¥10,400,000 (Direct Cost: ¥8,000,000、Indirect Cost: ¥2,400,000)
Fiscal Year 2015: ¥10,530,000 (Direct Cost: ¥8,100,000、Indirect Cost: ¥2,430,000)
Fiscal Year 2014: ¥14,820,000 (Direct Cost: ¥11,400,000、Indirect Cost: ¥3,420,000)
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| Outline of Final Research Achievements |
A critical groundwater contamination with radionuclides was caused by nuclear waster processing in Southern Ural. An intermediate level radioactive waste (million to ten billion Bq/kg with Russian standard 2000) was discarded to Lake Karachai from 1951, and it penetrated into groundwater. Observation using over 200 boreholes has been conducted and study focusing on nanoparticles was well done, but microbial function was not elucidated yet. We revealed (1) microbial abundance was significant in contaminated groundwater. (2) DNA analysis revealed denitrifying microbes. (3) Denitrifying may change redox potential leading adsorption of some radionuclides to particles. (4) Isolated microbes adsorbed radionuclides as 239Pu(IV), 241Am(III) and others. (5) Chemical property and function of nanoparticles changed by geology. (6) Simulation modeling of GETFLOWS estimates future distribution of contaminated groundwater. We extend our understanding on the behavior of radionuclides in groundwater.
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