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Journal Articles

Fe, Mn and $$^{238}$$U accumulations in ${it Phragmites australis}$ naturally growing at the mill tailings pond; Iron plaque formation possibly related to root-endophytic bacteria producing siderophores

Nakamoto, Yukihiro*; Doyama, Kohei*; Haruma, Toshikatsu*; Lu, X.*; Tanaka, Kazuya; Kozai, Naofumi; Fukuyama, Kenjin; Fukushima, Shigeru; Ohara, Yoshiyuki; Yamaji, Keiko*

Minerals (Internet), 11(12), p.1337_1 - 1337_17, 2021/12

Mine drainage is a vital water problem in the mining industry worldwide because of the heavy metal elements and low pH. Rhizofiltration using wetland plants is an appropriate method to remove heavy metals from the water via accumulation in the rhizosphere. ${it Phragmites australis}$ is one of the candidate plants for this method because of metal accumulation, forming iron plaque around the roots. At the study site, which was the mill tailings pond in the Ningyo-toge uranium mine, ${it P. australis}$ has been naturally growing since 1998. The results showed that ${it P. australis}$ accumulated Fe, Mn, and $$^{238}$$U in the nodal roots without/with iron plaque compared with other plant tissues. Among the 837 bacterial colonies isolated from nodal roots, 88.6% showed siderophore production activities. Considering iron plaque formation around ${it P. australis}$ roots, we hypothesized that microbial siderophores might influence iron plaque formation because bacterial siderophores have catechol-like functional groups. The complex of catechol or other phenolics with Fe was precipitated due to the networks between Fe and phenolic derivatives. The experiment using bacterial products of root endophytes, such as ${it Pseudomonas}$ spp. and ${it Rhizobium}$ spp., showed precipitation with Fe ions, and we confirmed that several ${it Ps.}$ spp. and ${it R.}$ spp. produced unidentified phenolic compounds. In conclusion, root-endophytic bacteria such as ${it Pseudomonas}$ spp. and ${it R.}$ spp., isolated from metal-accumulating roots of ${it P. australis}$, might influence iron plaque formation as the metal accumulation site. Iron plaque formation is related to tolerance in ${it P. australis}$, and ${it Ps.}$ spp. and ${it R.}$ spp. might indirectly contribute to tolerance.

Journal Articles

Groundwater flow analysis and material transport analysis in Covered open pit site

Fukushima, Shigeru; Sakao, Ryota; Nagayasu, Takaaki; Ohara, Yoshiyuki

Heisei-29-Nendo Zenkoku Kozan, Seirenjo Gemba Tantosha Kaigi Shigen/Shinzozai Koenshu, p.61 - 66, 2017/06

no abstracts in English

JAEA Reports

History and current situation of mine water treatment in Ningyo-toge Uranium Mine

Nagayasu, Takaaki; Taki, Tomihiro; Fukushima, Shigeru

JAEA-Technology 2016-031, 53 Pages, 2017/02

JAEA-Technology-2016-031.pdf:4.42MB

The forerunner of JAEA, found a smelter in 1964 to do industrialization tests of hydrometallurgical extraction process from domestic uranium ore to uranium tetrafluoride, extracted at Ningyo-toge. Yotsugi Mill Tailings Pond was constructed for the purpose of depositing slag and other things generated due to the operation of the smelter. Furthermore supernatant water from the deposition field had been treated appropriately at wastewater treatment facilities, which has been provided in the downstream site of the pond. We have been utilizing the Yotsugi Mill Tailings Pond as a temporary storage field of mine water generated from the old mining gallery, mainly. After filing an abolition report of facilities of the smelter, with the completion of industrial trials of refinery in 1982. Ningyo-toge environmental engineering center has studied for processing uranium and radium, in wastewater, which must be reduced more safely by advancing these processing technical development. Supernatant water of The Pond is treated at the wastewater treatment facilities before discharging to Ikegogawa-river. And those collateralize the emission standards to discharge to the river set at the Center with continuing stable processing. This document summarized the history of the wastewater treatment, technical development for the water treatment, and the current situation of the water treatment.

JAEA Reports

Environmental remediation for the upstream of Yotsugi Mill Tailings Pond, Ningyo-toge Uranium Mine

Saito, Hiroshi; Sato, Yasushi*; Sakamoto, Atsushi*; Torikai, Kazuyoshi; Fukushima, Shigeru; Sakao, Ryota; Taki, Tomihiro

JAEA-Technology 2015-063, 119 Pages, 2016/03

JAEA-Technology-2015-063.pdf:86.2MB

Ningyo-toge Environmental Engineering Center has been conducting environmental remediation of the Ningyo-toge Uranium Mine, after decades of mine-related activities were terminated. Its purposes are to take measures to ensure safety and radiation protection from the exposure pathways to humans in future, and to prevent the occurrence of mining pollution. As part of the remediation, upstream part of the Yotsugi Mill Tailings Pond, the highest prioritized facility, has been remediated to fiscal year 2012. Multi-layered capping has been constructed using natural material, after specifications and whole procedure being examined in terms of long-term stability, radiation protection, economics, etc. Monitoring has been carried out to confirm the effectiveness of the capping, in terms of settlement, dose and radon exhalation rates, etc. Monitoring of drainage volume of penetrated rainwater is planned. Accumulated data will be examined and used for remediation of downstream part of the Pond.

Journal Articles

Water penetration test using mock protection layer system for multi-layered capping planned in Ningyo-toge Environmental Engnieering Center

Fukushima, Shigeru; Taki, Tomihiro; Saito, Hiroshi; Torikai, Kazuyoshi; Sato, Yasushi*

Nihon Chikasui Gakkai 2013-Nen Shuki Koenkai Koen Yoshi, p.258 - 263, 2013/10

no abstracts in English

Oral presentation

R&D project on irradiation damage management technology for structural materials of long-life nuclear plant; R&D of irradiation damage indicator and irradiation damage management

Wakai, Eiichi; Takada, Fumiki; Takaya, Shigeru; Kato, Shoichi; Kitazawa, Sin-iti; Okubo, Nariaki; Suzudo, Tomoaki; Fujii, Kimio; Yoshitake, Tsunemitsu; Kaji, Yoshiyuki; et al.

no journal, , 

no abstracts in English

Oral presentation

Development of reactivity feedback effect measurement techniques under sub-critical condition in fast reactor, 1-5; FCA experimental plan

Fukushima, Masahiro; Okajima, Shigeaki; Kitamura, Yasunori; Ando, Masaki; Yamane, Tsuyoshi; Mori, Takamasa; Nishi, Hiroshi; Yamane, Yoshihiro*; Kanemoto, Shigeru*

no journal, , 

no abstracts in English

Oral presentation

Development of reactivity feedback effect measurement techniques under sub-critical condition in fast reactor, 1-1; Purpose and program

Okajima, Shigeaki; Nishi, Hiroshi; Yamane, Yoshihiro*; Kanemoto, Shigeru*; Yamane, Tsuyoshi; Mori, Takamasa; Kitamura, Yasunori; Fukushima, Masahiro; Kitano, Akihiro; Ando, Masaki; et al.

no journal, , 

The program was planned and has been carried out to develop of the reactivity feedback effect measurement techniques under sub-critical condition in the start-up experiment for fast reactors. The program includes the demonstration of the developed technique in fast critical assembly (FCA) and the proposal of the appropriate measurement system based on the results. The background and the purposes of the program and the outline of development subjects are presented.

Oral presentation

Development of reactivity feedback effect measurement techniques under sub-critical condition in fast reactor, 2-1; Skelton of program

Okajima, Shigeaki; Nishi, Hiroshi; Kanemoto, Shigeru*; Yamane, Yoshihiro*; Fukushima, Masahiro; Kitamura, Yasunori; Kitano, Akihiro; Suzuki, Takayuki; Ando, Masaki; Yamane, Tsuyoshi

no journal, , 

no abstracts in English

Oral presentation

Groundwater flow simulation of Yotsugi Former Mining Open-pit

Fukushima, Shigeru; Sato, Kazuhiko

no journal, , 

no abstracts in English

Oral presentation

A Validation study on applicability of the thermal-hydrological-chemical coupling method to manage groundwater quantities and qualities in Yotsugi Former Open-pit Mine

Tawara, Yasuhiro*; Yoshida, Takafumi*; Fukushima, Shigeru; Ohara, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

Seismic response analysis for foundation of tailing dam on discontinuous rock mass

Horikawa, Shigeo*; Sasaki, Takeshi*; Koshigai, Masaru*; Fukushima, Shigeru; Ohara, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

Seismic response analysis of tailing dam foundation on discontinuous rock masses and counter measure design

Sasaki, Takeshi*; Koshigai, Masaru*; Horikawa, Shigeo*; Fukushima, Shigeru; Ohara, Yoshiyuki

no journal, , 

Oral presentation

Water purification influence of aquatic plants naturally growing in the slag accumulation site, Ningyo-toge mine

Yamaji, Keiko*; Nakamoto, Yukihiro*; Haruma, Toshikatsu*; Doyama, Kohei*; Ohara, Yoshiyuki; Tanaka, Kazuya; Fukuyama, Kenjin; Fukushima, Shigeru

no journal, , 

no abstracts in English

Oral presentation

Application of hydro-chemical coupled simulator for control work design to reduce polluted water in Ningyo-toge uranium mine

Tawara, Yasuhiro*; Yoshida, Takafumi*; Matsuura, Taichi*; Fukazawa, Soki*; Tokoro, Chiharu*; Fukushima, Shigeru; Ohara, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

Modeling of groundwater recharge and discharge for controlling radium in the mine drainage of Ningyo-toge Mine, Okayama Prefecture

Tomiyama, Shingo*; Igarashi, Toshifumi*; Odashiro, Kana*; Yamaguchi, Kohei*; Fukushima, Shigeru; Ohara, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

Elucidation of radionuclide ($$^{238}$$U) and heavy metal (Fe, Mn) accumulation mechanism in phragmites australis influenced by root endophytic bacteria

Nakamoto, Yukihiro*; Yamaji, Keiko*; Haruma, Toshikatsu*; Doyama, Kohei*; Ohara, Yoshiyuki; Tanaka, Kazuya; Fukuyama, Kenjin; Fukushima, Shigeru

no journal, , 

no abstracts in English

Oral presentation

Case study of earthquake response analysis of a mine rubble deposit sites using NMM+DDA coupled analysis

Horikawa, Shigeo*; Sasaki, Takeshi*; Koshigai, Masaru*; Fukushima, Shigeru; Ohara, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

Seepage flow analysis during earthquake on jointed rock mass using multiple yield models

Horikawa, Shigeo*; Sasaki, Takeshi*; Koshigai, Masaru*; Fukushima, Shigeru; Ohara, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

Earthquake response analysis of a mine rubble deposit sites using NMM+DDA coupled analysis

Horikawa, Shigeo*; Sasaki, Takeshi*; Koshigai, Masaru*; Fukushima, Shigeru; Ohara, Yoshiyuki

no journal, , 

23 (Records 1-20 displayed on this page)