Decontamination of neutron-activated radioactive concrete waste by separating Eu, Co, Fe, and Mn-containing sand particles using dense medium separation

Hong, Seokju; Um, Wooyong

doi:10.1016/j.jhazmat.2022.130183

Cited by 7 publications

(2 citation statements)

References 32 publications

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“…The present research applied analytical grade chemicals without further puri cation and used ultrapure water (Milli-Q, Millipore, 18.2 MΩ•cm) as the general solvent. The mass ratio of concrete samples was based on the NPPs reports: 24.6 g of dry sand, 14.0 g of ordinary Portland cement (OPC, Type I), and 3.4 g of y ash were mixed for the homogeneity of the concrete composition [38][39][40]. After mixing thoroughly, 8.0 mL of ultrapure water was added.…”

Section: Concrete Spiking and Characterizationmentioning

confidence: 99%

Assessment of Uranium and Thorium Co-contaminant Exposure from Incidental Concrete Dust Ingestion

Abdul Rashid,

Um,

Juhasz

et al. 2024

Korean J. Chem. Eng.

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Potential health risks of contaminated media linked to bioavailability and hematotoxicity of uranium-238 ( 238 U) and thorium-232 ( 232 Th) remain uncertain. This study investigates the relative bioavailability (RBA), histopathological, and hematological effects of acute oral exposure to 238 U and 232 Th in cocontaminated concrete dust using 174 female Sprague Dawley (SD) rats. In order to create a range of 238 U and 232 Th concentrations, concrete was spiked with uranyl and thorium nitrates (~ 50, 100, and 200 mg kg −1 ). Spiked concretes were then crushed, ground, sieved (≤75 µm), and blended uniformly to create co-contaminated concrete dust. SD rats' diet pellet was amended with co-contaminated concrete dust and orally ingested over a 48-hour exposure period. The RBA values of 238 U and 232 Th in post-exposure rats' blood were determined as 22.0% ± 0.86% -30.8% ± 1.01% and 11.8% ± 0.14% -13.7% ± 0.29%, respectively. Compared to 232 Th, 238 U blood levels of SD rats fed with co-contaminated concrete dustamended diets were ~ 100-fold higher due to solubility differences, and 238 U-RBA values were approximately two-fold greater, revealing that their absorption rates in the gastrointestinal tract were affected by compound solubility. Post-acute 238 U and 232 Th ingestion from co-contaminated concrete dust demonstrate noticeable histopathological and hematological alterations, implying that intake of 238 U and 232 Th in co-contaminated concrete dust can lead to erythrocytes damage and elevated hematological attributes. Our study would be bene cial for an adequate understanding of the health implications caused by the acute oral exposures of 238 U and 232 Th in co-contaminated concrete dust, especially in the bioavailability and toxicity assessment.

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Section: Concrete Spiking and Characterizationmentioning

confidence: 99%

Assessment of Uranium and Thorium Co-contaminant Exposure from Incidental Concrete Dust Ingestion

Abdul Rashid,

Um,

Juhasz

et al. 2024

Korean J. Chem. Eng.

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“…The most common equipment for dewatering and sand cleaning is spiral classifiers [27]. In the work, the shortcomings of the classifiers were determined, and it was established that over time, during technological operations, clay and dusty particles accumulate in the bedding layer on the side of the trough between two adjacent spirals, while they form compacting layers that prevent water filtration, as a result of which the final moisture content of the sand increases.…”

Section: Introductionmentioning

confidence: 99%

Study of Humidity During Sand Dewatering Using a Cone-Shaped Installation

Beliuchenko,

Tishechkina,

Hannichenko

et al. 2023

KEM

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The issue of moisture content of sand, which is used in construction as an aggregate for asphalt concrete mixtures, in the production of silicate building materials, roofing roll materials, and various types of glass, is considered. The results of an experimental study of the process of dewatering construction sand samples in conical warehouses under the conditions of using vacuum systems, depending on the time and placement scheme of needle filters, are presented.

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Innovative deep decontamination of radioactive solid surfaces using microemulsions of deep eutectic solvents in supercritical carbon dioxide

Lv,

Gao,

Chen

et al. 2024

Chemical Engineering Journal

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Decontamination of neutron-activated radioactive concrete waste by separating Eu, Co, Fe, and Mn-containing sand particles using dense medium separation

Cited by 7 publications

References 32 publications

Assessment of Uranium and Thorium Co-contaminant Exposure from Incidental Concrete Dust Ingestion

Assessment of Uranium and Thorium Co-contaminant Exposure from Incidental Concrete Dust Ingestion

Study of Humidity During Sand Dewatering Using a Cone-Shaped Installation

Innovative deep decontamination of radioactive solid surfaces using microemulsions of deep eutectic solvents in supercritical carbon dioxide

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