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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

Environmental remediation of the mill tailings pond in Ningyo-toge Mine

Sakao, Ryota; Saito, Hiroshi; Torikai, Kazuyoshi; Taki, Tomihiro

Journal of MMIJ, 130(6), p.275 - 278, 2014/06

Ningyo-toge Environmental Engineering Center, Japan Atomic Energy Agency has been managing the Ningyo-toge Uranium Mine and Togo Uranium Mine in accordance with the Mine Safety laws. This paper shows a summary of the remediation activities of Mill Tailings Pond including the strategy and monitoring.

Journal Articles

Numerical evaluation of a multiple soil barrier system preventing water infiltration

Takayama, Yusuke*; Ikuta, Yuki*; Iizuka, Atsushi*; Kawai, Katsuyuki*; Taki, Tomihiro; Sakao, Ryota; Ichikawa, Yasuaki*

Unsaturated Soils; Research & Applications, p.659 - 665, 2014/06

In this paper, a multiple unsaturated soil barrier consisting of gravel, sand and bentonite-mixed soil layers is considered as a hardly permeable covering to prevent rainwater from infiltrating into waste deposits. Not only the quite low permeability of bentonite-mixed soil layer but also a function of capillary barrier between granular layers having different water-retention capabilities is expected to prevent water infiltration. A series of numerical simulation is carried out to evaluate performance of the multiple soil barrier using saturated/unsaturated soil/water coupled FE computation technique. The multiple unsaturated soil barrier system considered here is 10m long and 1.5 m thick consisting of sandy soil surface, sand filter, gravel layer, sand filter and bentonite-mixed clayey layer. And the soil barrier system is assumed to be placed as a covering with a 5% inclination on the waste deposit. The performance of the multiple soil barrier system is shown as a management chart to maintain impermeable ability associated with possible rainfall intensity. Particularly, in this paper, actual rainfall record in Okayama area is employed to determine the rainfall intensity which is imposed as a boundary condition in the computation. According to the simulation results, it is found that the capillary barrier is a key issue in evaluating the long term performance of the barrier system. And, it is confirmed that the barrier system considered in this paper can work well against the maximum intensity of the rainfall in the past record.

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

Journal Articles

Remediation strategy, capping construction and ongoing monitoring for the mill tailings pond, Ningyo-toge Uranium Mine, Japan

Saito, Hiroshi; Taki, Tomihiro

Proceedings of 15th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM 2013) (CD-ROM), 4 Pages, 2013/09

Ningyo-toge Environmental Engineering Center has been managing the Ningyo-toge Uranium Mine. The Mine is subject to environmental remediation to ensure the radiation protection from the exposure pathways to humans in future, and to prevent occurrence of mining pollution. The Yotsugi Mill Tailings Pond is considered as the highest prioritized facility. So far, capping is put on the stable upstream part of the Pond to reduce dose rate, radon exhalation and rainwater precipitation. Prior to its construction, it was decided that the capping are to be multi-layered and natural materials are to be used, and the capping specifications were decided. Also, drainage channels and gabion work are constructed around the capping and at the foot of capping slope, respectively. Monitoring, which will continue for years, has started to confirm the effectiveness of the capping and the data will be utilized for the future remediation of the downstream of the Pond.

Journal Articles

Environmental remediation activities at the Ningyo-toge uranium mine, Japan

Saito, Hiroshi; Taki, Tomihiro

Proceedings of 13th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM 2010) (CD-ROM), p.533 - 537, 2010/10

Ningyo-toge Environmental Engineering Center, Japan Atomic Energy Agency (JAEA) has maintained and preserved the Ningyo-toge and Togo Mines under the related laws, including the Mine Safety Law. JAEA has been planning to close these mines to prevent mine-pollution and reduce radiological impact to as low as achievably possible, for lasting protection of individuals and the environment. Among the mine-related facilities that are subject to environmental remediation, the Mill Tilings Pond is given the top priority. So far, basic concept has been discussed in parallel with data acquisition and designing for some of remediation activities.

Journal Articles

Environmental remediation and related activities at Ningyo-toge Mine

Saito, Hiroshi; Taki, Tomihiro

Journal of MMIJ, 126(6), p.239 - 242, 2010/05

Ningyo-toge Environmental Engineering Center, Japan Atomic Energy Agency (JAEA) has maintained and preserved the Ningyo-toge and Togo Mines under the related laws, including the Mine Safety Law. JAEA has been planning to close these Mines to prevent mine-pollution and reduce radiological impact to as low as achievably possible, for lasting protection of individuals and the environment. Among the mine-related facilities that are subject to environmental remediation, the Mill Tilings Pond is given the top priority. So far, basic concept has been discussed in parallel with data acquisition and designing for some of remediation activities.

JAEA Reports

Extraction and separation of uranium from simulated uranium-containing liquid wastes of Ningyo-toge environmental engineering center

Mitamura, Hisayoshi; Naganawa, Hirochika; Nagano, Tetsushi; Yanase, Nobuyuki; Hanzawa, Yukiko; Shimojo, Kojiro; Matsubara, Tatsuo; Mita, Yutaka; Taki, Tomihiro; Murata, Masato

JAEA-Research 2008-113, 27 Pages, 2009/03

JAEA-Research-2008-113.pdf:31.84MB

An effective mass processing equipment using solvent extraction method, named "emulsion flow extractor," is the most promising apparatus for removal and recovery of uranium from liquid waste originated from decontamination of uranium-contaminated fluoride waste in the uranium conversion test facility and of used gas centrifuges in the uranium enrichment facility at Ningyo-toge environmental engineering center. Prior to application of the emulsion flow extractor for actual uranium-containing liquid waste, properties of some phosphorous extractants for extraction and separation of uranium and constituents from simulated liquid wastes were examined through batch tests. These preliminary tests revealed that D2EHPA would be a promising candidate for extractant used for treatment of the actual uranium-containing liquid wastes, and that the extractants with a surfactant like AOT would not be useful.

Journal Articles

Method for removing radium from mine water

Naganuma, Masaki; Taki, Tomihiro

JAEA-Conf 2006-007, p.55 - 58, 2006/06

no abstracts in English

JAEA Reports

None

Naganuma, Masaki; Taki, Tomihiro; ;

JNC TN6420 2000-004, 39 Pages, 2000/05

JNC-TN6420-2000-004.pdf:2.96MB

None

JAEA Reports

Recovery of uranium in the eluted solution from waste water treatment facilites at Ningyo-toge environmental engineering center (part1)

; Taki, Tomihiro

JNC TN6430 99-001, 20 Pages, 1999/04

JNC-TN6430-99-001.pdf:0.35MB

In Ningyo-toge Environmental Engineering Center, uranium eluted solution from Uranium Recovery Facility is stored in a vessel of Heap Leaching Facility. In consideration of technical and economical aspects, we have studied to eliminate uranium from the solution by means of adsorption method. this report su㎜arizes the experimental results of bascic study on the uranium absorption by ion exchange resins in order to develop the uranium treatment process.

JAEA Reports

None

Naganuma, Masaki; Taki, Tomihiro; ;

JNC TN6420 99-009, 25 Pages, 1999/04

JNC-TN6420-99-009.pdf:0.7MB

None

JAEA Reports

Study on the treatment process of uranium waste at Ningyo-toge environmental engineering center (Part3); Basic study on the uranium and fluorine separation from uranium waste

; Taki, Tomihiro

JNC TN6430 99-002, 27 Pages, 1999/03

JNC-TN6430-99-002.pdf:0.67MB

Uranium solid waste are generated from each facility in Ningyo Toge Environmental Engineering Center. One of the most representatives of them is sludge that came from Milling and Conversion Pilot Plant. The sludge generally consist of uranium, fluorine, calcium, and so on. Considering the capacity of their storage and the appreciation of safety in the storage shed, in the near future, a lot of sludge have to be reduced in volume without delay. This report summarizes the experimental results of bascic study on the uranium and fluorine separation by chelating resin in order to develop the treatment process of sludge.

Journal Articles

Development of Separation Process for Uranium and Impurity Based on Chelating Resin

Taki, Tomihiro; Naganuma, Masaki; Jo, Akinori*

Donen Giho, (104), p.141 - 147, 1997/12

None

Journal Articles

Chloride pyrometallurgy of uranium Ore, 2

Taki, Tomihiro; ; Otomura, Keiichiro; Takenaka, Toshihide*; Sato, Nobuaki*; Fujino, Takeo*

Journal of Nuclear Science and Technology, 33(4), p.327 - 332, 1996/00

None

Journal Articles

Chloride Pyrometallurgy of Uranium Ore, 1; Chlorination of Phosphate Ore Using Solid or Gas Chlorinating Agent and Carbon

Taki, Tomihiro; Komoto, Shigetoshi; Otomura, Keiichiro; Takenaka, Toshihide*; Sato, Nobuaki*; Fujino, Takeo*

Journal of Nuclear Science and Technology, 32(9), p.880 - 888, 1995/00

None

JAEA Reports

None

; Taki, Tomihiro

PNC TN6510 94-001, 19 Pages, 1994/09

PNC-TN6510-94-001.pdf:0.65MB

no abstracts in English

JAEA Reports

None

Taki, Tomihiro*

PNC TN7410 90-024, 69 Pages, 1990/08

PNC-TN7410-90-024.pdf:1.42MB

None

JAEA Reports

None

Taki, Tomihiro*; ;

PNC TN7410 89-023, 44 Pages, 1989/06

PNC-TN7410-89-023.pdf:0.74MB

None

31 (Records 1-20 displayed on this page)