Removal and Adsorption of Radioactive Cesium from Contaminated Soil  Caused by the Fukushima Daiichi Nuclear Power Station Accident

Satô, Kenji; Takiuchi, Shin; Kakuta, Misato; Suzuki, Ryoma; Sasaki, Hideaki; Sakamoto, Naomichi

doi:10.2116/bunsekikagaku.62.535

Cited by 7 publications

(4 citation statements)

References 2 publications

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“…In addition, the use of thiourea-containing sulfuric acid solutions [3], improved wet classification and used of geomaterials [4], and the use of photosynthetic bacteria [5][6] have been being investigated as potential decontamination methods for the treatment of radioactive Cs-contaminated soil.…”

Section: Introductionmentioning

confidence: 99%

Determination of Cesium Adsorption Breakthrough Curves Using Carbonized Rice Hull and Beech Sawdust as Adsorbents

Miura¹

2017

eer

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To determine the adsorption breakthrough curves of carbonized rice hull and beech sawdust, which were selected as candidate natural materials for Cesium (Cs) adsorption in our previous study, fixed-bed adsorption experiments were conducted. These experiments were performed using a glass column with a continuous flow system and a variable packed-bed height of the above materials. For carbonized rice hull, the breakthrough point appeared relatively early, although a long adsorption time was required to reach the end point. In addition, for beech sawdust, the maximum Cs concentration at the column outlet was approximately 1.2 times that at the inlet. Regarding the Cs mass balance in the packed-bed layer, the amount of Cs adsorbed per unit weight of adsorbent was greater for carbonized rice hull than for beech sawdust. Furthermore, the adsorption ratio in the packed-bed was higher for beech sawdust than for carbonized rice hull. However, following estimation of the length of the adsorption zone formed in the packed bed using the model formula commonly employed in the design of the fixed-bed adsorption apparatus, it was not possible to calculate the real length of the adsorption zone.

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Section: Introductionmentioning

confidence: 99%

Determination of Cesium Adsorption Breakthrough Curves Using Carbonized Rice Hull and Beech Sawdust as Adsorbents

Miura¹

2017

eer

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“…However, Cs + selective ion exchangers are still needed for extremely high acidic conditions (1 to 3 M HCl), encountered in reprocessed wastes from spent nuclear fuel [16][17][18] or acid extracts to remove radioactive 137 Cs + from contaminated soils at Fukushima. 5 Herein, we report a nanolayered tin phosphate material which is superselective for 137 Cs + from extremely acidic solutions and remarkably superior to the current cesium exchangers specifically from such solutions.…”

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confidence: 98%

“…Nuclear accidents at Three Mile Island, Chernobyl and Fukushima led to the release of hazardous radioactive species such as Cs, Sr, and I into the environment [1][2][3][4] but contamination by 137 Cs occurred over a larger area of Fukushima because of its higher volatility than 90 Sr at the time of the accident and hence Cs was proposed to be extracted with acid from contaminated soils of Fukushima for remediation. 5 Reprocessing of spent nuclear fuel also generates extremely acidic solutions containing 137 Cs + . Selective Cs + exchangers such as g-Zr phosphate, 1 Na-phlogopite mica, 2 zeolites 1,2 Na silicotitanate (Na-ST), [6][7][8] gallium antimony sulfide, 9 manganese tin sulfide, 10 Na titanate, 11 and vanadosilicate 12 have been developed for the separation of 137 Cs from nuclear waste solutions.…”

mentioning

confidence: 99%

“…Because this nanolayered 15 Å SnP-H + phase could be synthesized under extremely low pH conditions (pH = 0) (Table S1, ESI †), we hypothesized that this material could be very stable and useful to remove Cs + from highly acidic waste solutions such as the reprocessed waste solutions from nuclear spent fuel [16][17][18] or acid extracts generated for removing radioactive 137 Cs + from contaminated soils at Fukushima. 5 Therefore, we proceeded to determine the Cs + selectivity of this nanolayered phase using very highly acidic solutions and compared it with several currently available acid stable exchange media.…”

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Nanolayered tin phosphate: a remarkably selective Cs ion sieve for acidic waste solutions

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Radiocesium contamination in house dust within evacuation areas close to the Fukushima Daiichi nuclear power plant

Shinohara

Yoshida-Ohuchi

2018

Environment International

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Outdoor decontamination efforts have been ongoing since the Fukushima Daiichi nuclear power plant (FDNPP) accident; however, little is known about indoor contamination. Therefore, house dust was sampled based on particle size in 21 wooden buildings (19 residential houses and 2 community centers) within the evacuation area close to the FDNPP, Fukushima Prefecture, Japan. Activities of radiocesium (Cs) per gram of house dust increased with decreasing particle size (mean: 6.1 × 10, 2.6 × 10, 1.6 × 10, 7.5 × 10, 5.0 × 10, and 4.6 × 10 Bq/g for <4-20, 20-63, 63-180, 180-500, 500-1000, and 1000-2000 μm, respectively). The Cs concentrations in house dust were inversely related to the square of distance from the FDNPP for<4-1000 μm particles. From the results of the multiple linear regression analysis, distance from the FDNPP and direction from the FDNPP (northwest) were significantly related to the radioactivity of house dust. It was found that 19%, 33%, and 48% of Cs in house dust were extracted in water, 1 M HCl, and not extracted, respectively. Considering the bioaccessibility and assuming a 20 mg/day daily intake of house dust, the daily doses would be 7.2 Bq/day (mean) and 18 Bq/day (95th percent quantile). These results provide valuable insight into indoor radioactive Cs contamination in the area around the FDNPP and possible oral exposure to indoor radioactive Cs after returning home.

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Removal and Adsorption of Radioactive Cesium from Contaminated Soil Caused by the Fukushima Daiichi Nuclear Power Station Accident

Cited by 7 publications

References 2 publications

Determination of Cesium Adsorption Breakthrough Curves Using Carbonized Rice Hull and Beech Sawdust as Adsorbents

Determination of Cesium Adsorption Breakthrough Curves Using Carbonized Rice Hull and Beech Sawdust as Adsorbents

Nanolayered tin phosphate: a remarkably selective Cs ion sieve for acidic waste solutions

Radiocesium contamination in house dust within evacuation areas close to the Fukushima Daiichi nuclear power plant

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