2017 Fiscal Year Final Research Report
Analysis on the behavior of radionuclides in groundwater in southern Ural, Russia and its simulation
Project/Area Number |
26257402
|
Research Category |
Grant-in-Aid for Scientific Research (A)
|
Allocation Type | Single-year Grants |
Section | 海外学術 |
Research Field |
Modeling and technologies for environmental conservation and remediation
|
Research Institution | Shizuoka University |
Principal Investigator |
Kato Kenji 静岡大学, 理学部, 名誉教授 (70169499)
|
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)
|
Co-Investigator(Renkei-kenkyūsha) |
OHNUKI Toshihiko 東京工業大学, 科学技術創成研究院, 教授 (20354904)
TOSAKA Hiroyuki 東京大学, 工学系研究科, 教授 (90188748)
|
Project Period (FY) |
2014-04-01 – 2018-03-31
|
Keywords | 放射性核種移行 / 地下水 / シミュレーションモデル / 微生物 / ナノ粒子 |
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.
|
Free Research Field |
地球環境微生物学
|