Progress of uranium-contaminated soil bioremediation technology

Cheng, Conghui; Chen, Luyao; Guo, Kexin; Xie, Jingxi; Shu, Yangzhen; He, Shuya; Xiao, Fangzhu

doi:10.1016/j.jenvrad.2021.106773

Cited by 32 publications

(5 citation statements)

References 23 publications

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“…Alpha-emitting radionuclides thorium (Th) and uranium (U) are of particular interest, being the most abundant radioactive elements in natural ecosystems and important sources of nuclear energy [88][89][90][91]; there exist large areas contaminated with these radionuclides. They are longest-lived isotopes: Th-232 has a half-life of 14 × 10 9 years; while U-235 and U-238 have half-lives of 7.04 × 10 8 and 4.5 × 10 9 years, respectively.…”

Section: Low-dose Radiation Effects On Luminous Marine Bacteriamentioning

confidence: 99%

Marine Bacteria under Low-Intensity Radioactive Exposure: Model Experiments

Kolesnik

Rozhko

Kudryasheva

2022

IJMS

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Radioactive contaminants create problems all over world, involving marine ecosystems, with their ecological importance increasing in the future. The review focuses on bioeffects of a series of alpha and beta emitting radioisotopes (americium-241, uranium-(235 + 238), thorium-232, and tritium) and gamma radiation. Low-intensity exposures are under special consideration. Great attention has been paid to luminous marine bacteria as representatives of marine microorganisms and a conventional bioassay system. This bioassay uses bacterial bioluminescence intensity as the main testing physiological parameter; currently, it is widely applied due to its simplicity and sensitivity. Dependences of the bacterial luminescence response on the exposure time and irradiation intensity were reviewed, and applicability of hormetic or threshold models was discussed. A number of aspects of molecular intracellular processes under exposure to low-intensity radiation were analyzed: (a) changes in the rates of enzymatic processes in bacteria with the bioluminescent system of coupled enzymatic reactions of NADH:FMN-oxidoreductase and bacterial luciferase taken as an example; (b) consumption of an intracellular reducer, NADH; (c) active role of reactive oxygen species; (d) repairing of the DNA damage. The results presented confirm the function of humic substances as natural radioprotectors.

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Section: Low-dose Radiation Effects On Luminous Marine Bacteriamentioning

confidence: 99%

Marine Bacteria under Low-Intensity Radioactive Exposure: Model Experiments

Kolesnik

Rozhko

Kudryasheva

2022

IJMS

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“…For instance, microorganisms living beneath the ocean floor have been suggested to play a role in the carbon and sulfur cycles, and global warming [ 5 ]. Other endolithic microorganisms may contribute to the bioremediation of contaminated soils [ 6 ]. In addition, these organisms may be responsible for the biomineralization of economically important mines [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Adaptation of the Endolithic Biome in Antarctic Volcanic Rocks

Hidalgo-Arias,

Muñoz-Hisado,

Valles

et al. 2023

IJMS

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Endolithic microorganisms, ranging from microeukaryotes to bacteria and archaea, live within the cracks and crevices of rocks. Deception Island in Antarctica constitutes an extreme environment in which endoliths face environmental threats such as intense cold, lack of light in winter, high solar radiation in summer, and heat emitted as the result of volcanic eruptions. In addition, the endolithic biome is considered the harshest one on Earth, since it suffers added threats such as dryness or lack of nutrients. Even so, samples from this hostile environment, collected at various points throughout the island, hosted diverse and numerous microorganisms such as bacteria, fungi, diatoms, ciliates, flagellates and unicellular algae. These endoliths were first identified by Scanning Electron Microscopy (SEM). To understand the molecular mechanisms of adaptation of these endoliths to their environment, genomics techniques were used, and prokaryotic and eukaryotic microorganisms were identified by metabarcoding, sequencing the V3–V4 and V4–V5 regions of the 16S and 18S rRNA genes, respectively. Subsequently, the sequences were analyzed by bioinformatic methods that allow their metabolism to be deduced from the taxonomy. The results obtained concluded that some of these microorganisms have activated the biosynthesis routes of pigments such as prodigiosin or flavonoids. These adaptation studies also revealed that microorganisms defend themselves against environmental toxins by activating metabolic pathways for the degradation of compounds such as ethylbenzene, xylene and dioxins and for the biosynthesis of antioxidant molecules such as glutathione. Finally, these Antarctic endolithic microorganisms are of great interest in astrobiology since endolithic settings are environmentally analogous to the primitive Earth or the surfaces of extraterrestrial bodies.

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“…Among them, physical remediation methods such as the soil exchange method, thermal desorption method [5], and glass solidification [6] method have had a significant effect on the remediation of heavy-metal-contaminated sites, but their shortcomings in energy consumption make them unconducive to the treatment of large amounts of contaminated soil. The chemical leaching [7] method has the potential risk of leaching the solution to the environment, while the electric remediation method, as an advanced remediation method without secondary pollution, presents the problem of the high cost of power consumption, and bioremediation [8] and phytoremediation technology [9] has the defect of a long remediation cycle, which is not conducive to the treatment of projects with a tight construction period. This study is based on the treatment of large-scale and high-concentration heavy-metal-contaminated sites, and S/S technology has the following characteristics: strong economic applicability, convenient operation, a short construction period, and a friendly environment.…”

Section: Introductionmentioning

confidence: 99%

Study on Properties of Copper-Contaminated Soil Solidified by Solid Waste System Combined with Cement

Liang¹,

Zhang

Fang

et al. 2022

Sustainability

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Three industrial solid wastes including red mud, carbide slag, and phosphogypsum combined with ordinary Portland cement were used as curing agents to solidify/stabilize loess polluted by a high concentration of copper ions. The unconfined compressive strength, resistivity, permeability coefficient, copper ion leaching concentration, pH value, and other engineering application evaluation indexes were analyzed to preliminarily assess the applicability of the curing agent in the remediation of soil contaminated with a high concentration of copper ions. The mineral phases and functional groups of solidified soil were detected using XRD and FTIR, showing that the strength, electrical resistivity, and pH value of solidified soil decrease following the addition of copper ions. Moreover, the strength and resistivity of solidified soil increase with the curing age, and the pH value decreases with age. For solidified contaminated soil, when the total content of curing agent increases from 10 to 20%, the maximum 28 d strength increases from 1.35 to 5.43 MPa, and in this study, its permeability coefficient, copper ion leaching concentration, and pH value were found to be within the limits set by relevant national standards. In conclusion, red mud-carbide slag-phosphogypsum combined with cement has a good stabilizing effect on sites polluted with a high concentration of copper ions.

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Progress of uranium-contaminated soil bioremediation technology

Cited by 32 publications

References 23 publications

Marine Bacteria under Low-Intensity Radioactive Exposure: Model Experiments

Marine Bacteria under Low-Intensity Radioactive Exposure: Model Experiments

Adaptation of the Endolithic Biome in Antarctic Volcanic Rocks

Study on Properties of Copper-Contaminated Soil Solidified by Solid Waste System Combined with Cement

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