Quasi-consecutive processing pilot plant of subcritical hydrothermal blasting for radioactively contaminated soil
Description
A quasi-consecutive processing pilot plant has been developed by means of a treatment system equipped with two pressure vessels for subcritical hydrothermal and subsequent blasting treatments connected in series with a valve. In the FY 2015 demonstration project of decontamination and volume reduction has been conducted by MOE (Ministry of Environment). The pilot was tested with fine-grained samples prepared from Fukushima's soil contaminated with radioactive cesium. The cesium reduction and the waste weight reduction rates reached approx. 70% and more than 96% by a single path consecutive treatment, respectively. The quasi-consecutive system was proved to have an over ten times higher processing speed and a 40% lower energy consumption than the batch processing plant. Based on the trial execution of the plant, the quasi-consecutive subcritical hydrothermal blasting system has demonstrated to be effective for decontamination of cesium-adsorbed soil and volume reduction of radioactive waste. (author)
Abstract (Japanese)
圧力容器を前段の水熱処理専用圧力容器と後段の爆砕処理専用容器に分割し、バルブを介して直列接続することにより、少量処理を連続して行う準連続式の亜臨界水熱爆砕処理パイロットプラントの開発に成功した。平成27年度(2015)環境省除染・減容等技術実証事業において、放射性Cs除染土壌より調製した放射性Cs含有細粒土を対象として、除染減容試験を実施した。粒径0.2mm以下に調製した細粒土は準連続水熱爆砕処理により高速に除染・減容化され、約70%の除染率、96%以上の重量減容率を得た。準連続式の処理速度はバッチ式に比べて10倍以上高速で、消費エネルギー量は40%以下に抑制できることが実証され、低コストで除染土壌除染処理ができることが明らかになり、準連続式水熱爆砕処理の有効性が実証された。(著者)Additional details
Additional titles
- Original title (Japanese)
- 準連続式亜臨界水熱爆砕処理技術による土壌除染実証プラント
Publishing Information
- Journal Title
- Dekomisshoningu Giho
- Journal Issue
- no.58
- Series
- 雑誌名:デコミッショニング技報
- Journal Page Range
- p. 24-37
- ISSN
- 1343-3881
INIS
- Country of Publication
- Japan
- Country of Input or Organization
- Japan
- INIS RN
- 50004629
- Subject category
- S54: ENVIRONMENTAL SCIENCES; S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
- Descriptors DEI
- CESIUM 137; CONTAMINATION; CRITICALITY; DOSE RATES; DOSEMETERS; EXPLOSIVE FRACTURING; GRAIN SIZE; HYDROTHERMAL SYSTEMS; NAI DETECTORS; PRESSURE VESSELS; RADIOACTIVITY; SOILS; WATER TREATMENT; X-RAY DIFFRACTION
- Descriptors DEC
- BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CESIUM ISOTOPES; COHERENT SCATTERING; CONTAINERS; DIFFRACTION; ENERGY SYSTEMS; FRACTURING; GEOTHERMAL SYSTEMS; INTERMEDIATE MASS NUCLEI; ISOTOPES; MEASURING INSTRUMENTS; MICROSTRUCTURE; NUCLEI; ODD-EVEN NUCLEI; RADIATION DETECTORS; RADIOISOTOPES; SCATTERING; SCINTILLATION COUNTERS; SIZE; SOLID SCINTILLATION DETECTORS; YEARS LIVING RADIOISOTOPES
Optional Information
- Notes
- 10 refs., 5 figs., 5 tabs.