scholarly journals Relationship between particle size and the radioactive cesium concentration in sediments from rivers flowing into Lake Kasumigaura

2013 ◽  
Vol 74 (3) ◽  
pp. 183-189 ◽  
Author(s):  
Yu TABAYASHI ◽  
Masumi YAMAMURO
Keyword(s):  
Particle Size ◽  
Radioactive Cesium ◽  
Lake Kasumigaura ◽  
Cesium Concentration

Distribution of Radioactive Cesium (134Cs Plus 137Cs) in a Contaminated Japanese Soybean Cultivar during the Preparation of Tofu, Natto, and Nimame (Boiled Soybean)

2013 ◽  
Vol 76 (6) ◽  
pp. 1021-1026 ◽  
Author(s):  
MAYUMI HACHINOHE ◽  
KEITAROU KIMURA ◽  
YUJI KUBO ◽  
KATSUO TANJI ◽  
SHIOKA HAMAMATSU ◽  
...  
Keyword(s):  
Animal Feed ◽  
Dry Weight ◽  
Soybean Cultivar ◽  
Radioactive Cesium ◽  
Processing Factor ◽  
Before And After ◽  
Cesium Concentration ◽  
Standard Limit ◽  
Processing Factors ◽  
Animal Consumption

We investigated the fate of radioactive cesium (134Cs plus 137Cs) during the production of tofu, natto, and nimame (boiled soybean) from a contaminated Japanese soybean cultivar harvested in FY2011. Tofu, natto, and nimame were made from soybean grains containing radioactive cesium (240 to 340 Bq/kg [dry weight]), and the radioactive cesium in the processed soybean foods and in by-product fractions such as okara, broth, and waste water was measured with a germanium semiconductor detector. The processing factor is the ratio of radioactive cesium concentration of a product before and after processing. For tofu, natto, nimame, and for the by-product okara, processing factors were 0.12, 0.40, 0.20, and 0.18, respectively; this suggested that these three soybean foods and okara, used mainly as an animal feed, can be considered safe for human and animal consumption according to the standard limit for radioactive cesium of soybean grains. Furthermore, the ratio of radioactive cesium concentrations in the cotyledon, hypocotyl, and seed coat portions of the soybean grain was found to be approximately 1:1:0.4.

scholarly journals Adsorptive Removal of Cesium Ions Using Prussian Blue Immobilized Coffee Ground Biochar

2021 ◽  
Vol 43 (5) ◽  
pp. 336-346
Author(s):  
Youngsu Lim ◽  
Dongwoo Kim ◽  
Jiseon Jang ◽  
Bolam Kim ◽  
Dae Sung Lee
Keyword(s):  
Prussian Blue ◽  
Surface Structure ◽  
Maximum Adsorption Capacity ◽  
Radioactive Cesium ◽  
Characteristic Analysis ◽  
Adsorptive Removal ◽  
Cesium Ions ◽  
Cage Size ◽  
Coffee Ground ◽  
Cesium Concentration

Objectives: Among various radioactive contaminants, radioactive cesium is one of the most harmful radionuclides that causes human health issues due to its high emission of gamma-ray, high solubility, high mobility, high fission yield, and long half-life. Different kinds of adsorbents have been developed for the removal of cesium from radioactive wastewater. Especially, biochar has attracted great attention as a potential adsorbent in the treatment of pollutants and for water purification. In addition, Prussian blue is a cubic lattice structure that contains a cage size similar to the hydrated cesium ionic radius, indicating it can selectively remove cesium ions. Therefore, the aim of this study is to investigate the cesium adsorption performance of synthesized Prussian blue-immobilized coffee ground biochar (PB-CGBC) under various experimental conditions for cesium removal from radioactive wastewater.Methods: After wasted coffee ground was washed and dried, it was heated at 400℃ with 10℃/min of heating rate and 5 h of retention time in a furnace with little or no available air. The PB-CGBC was synthesized using a facile co-precipitation method. Fourier transform-infrared spectroscopy, X-ray diffractometer, field emission-transmission electron microscope, Brunauer-Emmett-Teller, and zeta potential analyzer were used to analyze physico-chemical characteristics and surface structure of the synthesized adsorbents. The kinetic and equilibrium experiments of cesium adsorption on PB-CGBC were carried out and the effect of pH, temperature, initial cesium concentration, and contact time were also investigated in a batch system.Results and Discussion: The characteristic analysis clearly confirmed the successful synthesis of PB-CGBC, indicating its abundant functional groups and special surface structure. In the batch study, it was found that the cesium adsorption onto the PB-CGBC was exothermic nature. The Elovich kinetic model and Temkin isotherm also provided a good correlation with the cesium adsorption reaction onto the PB-CGBC. The maximum adsorption capacity of PB-CGBC for cesium was 129.57 mg/g at 15℃ and pH 8 at 40 mM of an initial cesium concentration, which was one of the highest values among those of previously reported adsorbents.Conclusions: In this study, the PB-CGBC was synthesized by immobilizing Prussian blue to the surface of coffee ground biochar and successfully applied for the adsorptive removal of cesium ions. Based on the experimental results, the synthesized PB-CGBC can be served as a great adsorbent for treatment of wastewater polluted with radioactive cesium.

scholarly journals Pilot-Scale Hydraulic Testing of Resorcinol Formaldehyde Ion Exchange Resin

2009 ◽  
Author(s):  
Duane J. Adamson
Keyword(s):  
Particle Size ◽  
Ion Exchange ◽  
Waste Treatment ◽  
National Laboratory ◽  
Pilot Scale ◽  
Hydraulic Testing ◽  
Radioactive Cesium ◽  
Size Change ◽  
Resorcinol Formaldehyde ◽  
Number Of Cycles

Savannah River National Laboratory (SRNL) performed pilot-scale hydraulic/chemical testing of spherical resorcinol formaldehyde (RF) ion exchange (IX) resin for the River Protection Project-Hanford Tank Waste Treatment & Immobilization Plant (WTP) Project. The RF resin hydraulic cycle testing was conducted in two pilot-scale IX columns, 1/4 and 1/2 scale. A total of twenty-three hydraulic/chemical cycles were successfully completed on the spherical RF resin. Sixteen of these cycles were completed in the 24″ IX Column (1/2 scale column). Hydraulic testing showed that the permeability of the RF resin remained essentially constant, with no observed trend in the reduction of the permeability as the number of cycles increased. The permeability during the pilot-scale testing was 3 times better than the design requirements of the WTP full-scale IX system. The RF resin bed showed no tendency to form fissures or pack more densely as the number of cycles increased. Particle size measurements of the RF resin showed no indication of particle size change (for a given chemical) with cycles and essentially no fines formation. The permeability of the resin bed was uniform with respect to changes in bed depth. Upflow Regeneration and Simulant Introduction in the IX columns revealed another RF resin benefit; negligible radial pressures to the column walls from the swelling of resin beads. The hydraulic and chemical performance of the spherical RF resin during cycle testing was found to be superior to all other tested IX resins. The pilot-scale testing indicates that the RF resin is durable and should hold up to many hydraulic cycles in actual radioactive Cesium (Cs) separation.

Decontamination of Radioactive Cesium from Sea Sludge Using Microbial Activity

2014 ◽  
Vol 617 ◽  
pp. 117-120
Author(s):  
Hirosuke Hirano ◽  
Nobuyuki Nishimiya ◽  
Yoshiyuki Kojima ◽  
Takeshi Toyama ◽  
Tetsuo Umegaki ◽  
...  
Keyword(s):  
Anaerobic Condition ◽  
Nuclear Power ◽  
Weight Ratio ◽  
Aerobic Condition ◽  
Deionized Water ◽  
Tokyo Bay ◽  
Radioactive Cesium ◽  
Cesium Nitrate ◽  
Wet Weight ◽  
Cesium Concentration

Fukushima nuclear power plant was destroyed by tsunami of the Great East Japan earthquake, and radioactive cesium was widely scattered from there. Further, highly concentrated radioactive cesium was found in the bottom of the sea sludge of Tokyo Bay, where the cesium concentration is 1.513 times as high as usual. However, the decontamination method of the bottom of the sea sludge is not yet established. Therefore, the authors proposed to decontaminate cesium from the sea sludge under an anaerobic condition, referenced from a previous study. Sludge and cesium nitrate were mixed with a wet weight ratio of 0.3 wt% for cesium nitrate to form a model mixture, and immersed in 6 dm3 of deionized water and kept for 10 days. As a result, the author found terms that is able to decrease amount of cesium in the sludge. However we found this term was not anaerobic condition from after research, finally found difficult to decreased cesium in the sludge without aerobic condition.

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