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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.

Journal Articles

Water treatment of Ningyo-toge mine

Nagayasu, Takaaki; Torikai, Kazuyoshi; Ohara, Yoshiyuki; Uechi, Yasufumi

Journal of MMIJ, 131(6), p.357 - 358, 2015/06

no abstracts in English

JAEA Reports

Technology developments for the decommissioning of uranium fuel facilities and the treatments of uranium wastes at Ningyo-toge Environmental Engineering Center

Annen, Sotonori; Ishimori, Yuu; Ema, Akira; Takanobu, Osamu; Nagayasu, Takaaki; Mita, Yutaka

JNC TN6400 2003-001, 35 Pages, 2003/10

JNC-TN6400-2003-001.pdf:2.78MB

Technology developments for the decommissioning of uranium fuel facilities and the treatments of uranium wastes are one of the current main projects in the Ningyo-toge Environmental Engineering Center of the Japan Nuclear Cycle Development Institute (JNC Ningyo-toge). In order to carry out the project reasonably and safely, all techniques from decommissioning to waste treatment should be unified systematically. Thus, the JNC Ningyo-toge is aiming at the establishment of a 'decommissioning engineering'. This booklet illustrates the decommissioning engineering, especially four engineering elements; that is, a removal technology for uranium compounds, a decommissioning technology of the centrifuges, an application of CaF2 precipitate and a decommissioning engineering system.

Oral presentation

Elucidation of the formation mechanism of manganese oxide by manganese oxidizing fungi at Ningyo-toge Mine

Takeda, Ayaka*; Nakano, Yuriko*; Ochiai, Asumi*; Yokoo, Hiroki*; Ohara, Yoshiyuki; Fukuyama, Kenjin; Nagayasu, Takaaki; Onuki, Toshihiko*; Utsunomiya, Satoshi*

no journal, , 

no abstracts in English

Oral presentation

Efforts for use of microorganisms in manganese removal from mine drainage

Miyata, Naoyuki*; Okano, Kunihiro*; Fujibayashi, Megumi*; Ohara, Yoshiyuki; Nagayasu, Takaaki; Fukuyama, Kenjin

no journal, , 

no abstracts in English

Oral presentation

Isolation of Mn-oxidizing fungi from mine water at Ningyo-toge mine and the culture characteristics

Yamaji, Keiko*; Ohara, Yoshiyuki; Fukuyama, Kenjin; Nagayasu, Takaaki; Haruma, Toshikatsu; Tanaka, Kazuya; Masuya, Hayato*; Habe, Hiroshi*

no journal, , 

no abstracts in English

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