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JAEA Reports

Radiation monitoring data of the HTTR rise-to-power test; Results up to 30MW operation on the high-temperature test operation mode

Ashikagaya, Yoshinobu; Kawasaki, Tomokatsu; Yoshino, Toshiaki; Ishida, Keiichi

JAERI-Tech 2005-010, 81 Pages, 2005/03

JAERI-Tech-2005-010.pdf:16.65MB

no abstracts in English

Journal Articles

Gas purification technology using electron beams

Kojima, Takuji

Shinku, 47(11), p.789 - 795, 2004/11

When flue gas/off gas is irradiated by EB, many free radicals such as OH and active oxygen atom are formed from major components of air: namely nitrogen, oxygen, water and carbon dioxide ecules. The similer reaction can be achieved using UV light and plasma-discharging, but ionizing radiations produce such free radicals at higher density. Such radiation-induced radicals react efficiently with air pollutants, SOx and NOx in coal/oil combustion flue gas at thermal power plants, dioxins in waste incineration flue gas and volatile organic compounds (VOC) even in very low concentration and decompose them into non-toxic substances or change them to removable substances. R & D on EB treatment of flue gas/off gas done in JAERI on the basis of this principle process, as an example, is described in the present paper.

Journal Articles

Purification technology for flue/off gases using electron beams

Kojima, Takuji

Shokubai, 46(3), p.248 - 253, 2004/04

The present paper describes research and development on purification technology using electron beams for flue/odd gases containing pollutants: removal of sulfate oxide and nitrogen oxide from flue gases of coal/oil combustion power plants, decomposition of dioxins in waste incineration flue gas, and decomposition/removal of toxic volatile organic compounds from off gas.

Journal Articles

Quick sample preparation for analysis of dioxins in flue gas from municipal solid waste incinerator

Takigami, Machiko; Arai, Hidehiko*; Hirota, Koichi; Taguchi, Mitsumasa; Hakoda, Teruyuki; Kojima, Takuji

Kankyo Kagaku, 14(1), p.13 - 23, 2004/03

The Japan Atomic Energy Research Institute undertook a pilot scale electron beam decompostion of dioxins in the flue gases from the municipal solid waste incinerator at the Takahama Clean Center. The conventional method, following the Japan Industrial Standards (JIS) method, takes 2 weeks at least to extract and purify dioxins from the flue gases for analysis by GC/MS. However, using a carbon adsorbent, the time required for the extraction of dioxins was shortened from 16 to 2.5 hours. Further improvements in the clean up process enabled the overall time to be reduced to less than a half of that rquired by the JIS method. Using this simplified method allows analysts, who are not practiced in the pretreatment of flue gases, to prepare samples for dioxin analysis by GC/MS. The sampling and pretreatment of the flue gases can, with this process, be completed within 4 days with accuracy comparable to JIS method.

Journal Articles

Application of electron beam for the reduction of PCDD/F emission from Municipal solid waste incinerators

Hirota, Koichi; Hakoda, Teruyuki; Taguchi, Mitsumasa; Takigami, Machiko; Kim, H.; Kojima, Takuji

Environmental Science & Technology, 37(14), p.3164 - 3170, 2003/07

 Times Cited Count:42 Percentile:67.46(Engineering, Environmental)

The electron-beam technology was applied to reduce polychlorinated dibenzo-p-dioxins (PCDD) and polychlorinated dibenzofurans (PCDF) in flue gases from the municipal solid waste incinerator (MSWI) at a temperature of 200$$^{circ}$$C. More than 90% of PCDD/Fs in a flue gas of 1000 m$$^{3}$$N/h was decomposed at a dose of 14 kGy. The decomposition of PCDD/Fs was probably initiated through reactions with OH radicals, followed by the dissociation of ether bond (-C-O-C-), the cleavage of aromatic rings, and dichlorination. The dechlorination of the higher dechlorinated PCDF homologues produced the lower chlorinated ones, which led to lower decomposition efficiency of PCDF than that of PCDD.

Journal Articles

Electron beam technologies for control of flue gases/wastewaters and their applications

Kojima, Takuji

Oyo Butsuri, 72(4), p.405 - 414, 2003/04

The advanced technologies are required to control pollutants e.g. dioxins in gas or water at extremely low concentration. The present paper introduces typical basic studies, developments of control technologies, and example of their industrial applications of electron beam technology having the features of oxidation, decomposition and detoxifying of such pollutants even at low concentration. It covers removal of SOx and NOx from coal-combustion flue gas, decomposition of gaseous volatile organic compound in off gas and dioxins in incineration flue-gas, purification of tap and wastewaters, and treatment of sewage/sludge.

Journal Articles

Dioxin decomposition/elimination technology using electron beams

Kojima, Takuji; Hirota, Koichi; Taguchi, Mitsumasa; Hakoda, Teruyuki; Takigami, Machiko

Proceedings of 25th JAIF-KAIF Seminar on Nuclear Industry, p.193 - 201, 2003/00

The electron beam technology for decomposition/elimination of dioxin contained in flue gas has been developed using real waste gas of 1,000 m$$^{3}$$N/h released from the municipal solid waste incineration facility at 200$$^{circ}$$C. The decomposition efficiency, the ratio of toxic equivalent dioxin concentration before and after EB irradiation to doses above 15kGy is higher than 90%, which clears the regulation limit in the Japanese special measures of dioxin release. The chemical process of dioxin decomposition was studied and low-toxicity of irradiated gas was confirmed in terms of endocrine disrupter influence.

Journal Articles

Electron-beam treatment of PCDD/Fs in the flue gas from a municipal solid waste incinerator

Hirota, Koichi; Hakoda, Teruyuki; Taguchi, Mitsumasa; Takigami, Machiko*; Kojima, Takuji

Proceedings of 9th International Conference on Radiation Curing (RadTech Asia '03) (CD-ROM), 4 Pages, 2003/00

The flue gas from a municipal solid waste incinerator (MSWI) was irradiated with electron beams to destroy polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs). A flue gas of 1,000 m$$^{3}$$/h N for the irradiation was obtained at 200$$^{circ}$$C from a main gas stream of the MSWI. The decomposition efficiencies of PCDD/Fs were increased with absorbed dose and reached 90% at a dose of 14 kGy. The reaction mechanisim for PCDD/Fs was also considered.

JAEA Reports

Radiation monitoring data of the HTTR rise-to-power test; Results up to 30 MW operation on the rated operation mode

Ashikagaya, Yoshinobu; Yoshino, Toshiaki; Yasu, Katsuji; Kurosawa, Yoshiaki; Sawa, Kazuhiro

JAERI-Tech 2002-094, 80 Pages, 2002/12

JAERI-Tech-2002-094.pdf:12.8MB

no abstracts in English

JAEA Reports

Acceleration irradiation test of first-loading fuel of High Temperature Engineering Test Reactor (HTTR) up to high burnup (Joint research)

Sawa, Kazuhiro; Sumita, Junya; Ueta, Shohei; Takahashi, Masashi; Tobita, Tsutomu*; Hayashi, Kimio; Saito, Takashi; Suzuki, Shuichi*; Yoshimuta, Shigeharu*; Kato, Shigeru*

JAERI-Research 2002-012, 39 Pages, 2002/06

JAERI-Research-2002-012.pdf:3.12MB

no abstracts in English

Journal Articles

Application of electron beam irradiation,4; Treatment of pollutants by electron beam irradiation

Tokunaga, Okihiro; Arai, Hidehiko

Radioisotopes, 43(12), p.781 - 790, 1994/12

no abstracts in English

Journal Articles

Evaluation on collection efficiency of activated carbon fiber filter for radioactive hydrogen sulfide in air effluent monitoring

; Kajimoto, Yoichi; ; Endo, Akira; Ikezawa, Yoshio

Hoken Butsuri, 29, p.189 - 194, 1994/00

no abstracts in English

Journal Articles

Technology development for environmental preservation by electron irradiation

Sato, Shoichi; Tokunaga, Okihiro; Arai, Hidehiko; Hashimoto, Shoji

Transactions of the American Nuclear Society, SUPPL.61, p.425 - 430, 1990/00

no abstracts in English

Journal Articles

Development of on emergency-use stack gas monitor

;

Nihon Genshiryoku Gakkai-Shi, 29(7), p.656 - 663, 1987/07

 Times Cited Count:0 Percentile:0.02(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Radiation chemical reactions in NO$$_{x}$$ and SO$$_{2}$$ removals from flue gas

;

Radiation Physics and Chemistry, 24(1), p.145 - 165, 1984/00

no abstracts in English

Journal Articles

Estimation method of fast neutron fluence in the JMTR

;

Nihon Genshiryoku Gakkai-Shi, 25(5), p.56 - 66, 1983/00

no abstracts in English

16 (Records 1-16 displayed on this page)
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