Nano-mineralogy of suspended sediment during the beginning of coal rejects spill

Civeira, Matheus S.; Ramos, Claudete Gindri; Oliveira, Marcos L.S.; Kautzmann, Rubens Müller; Taffarel, Sílvio Roberto; Teixeira, Elba Calesso; Silva, Luis

doi:10.1016/j.chemosphere.2015.11.059

Cited by 85 publications

(9 citation statements)

References 25 publications

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“…For other hazardous trace elements, the solid samples were first digested by a HF-HNO 3 solution in a microwave oven. The recovered solution samples and the liquid samples were analyzed for As, Cd, Se, Cr, and Pb using inductively coupled plasma mass spectrometry with reported by other authors. − X-ray fluorescence was used to determine the contents of major oxides and minor elements in the solid samples. The particle size of the solid samples was determined by a Malvern Particle Size Analyzer (MASTERSIZER 2000).…”

Section: Methodsmentioning

confidence: 99%

Partitioning of Hazardous Trace Elements among Air Pollution Control Devices in Ultra-Low-Emission Coal-Fired Power Plants

et al. 2017

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In this work, the partitioning of hazardous trace elements among air pollution control devices in five ultra-lowemission coal-fired power plants was investigated. Results showed that most of the trace elements were enriched in fly ash at 58.0−93.3% (Hg), 75.2−95.3% (As), 78.2−94.9% (Cd), 79.4−96.6% (Se), 73.8−89.2% (Cr), and 86.5−99.5% (Pb). A low-low temperature electrostatic precipitator (LLT-ESP) and electric fabric filter (EFF) greatly increased the relative enrichment factors of Hg, As, and Se in fly ash up to 0.78−1.23, 0.85−1.04, and 0.83−0.99, respectively. In the wet flue gas desulfurization (WFGD) system, the concentrations of trace elements in fine fractions were much higher than those in coarse fractions. Large amounts of Hg (2.17−168 μg/kg), Se (21.3−357 μg/kg), and Cd (44.1−839 μg/kg) in wastewater needed special treatment to satisfy the discharge standard. The wet electrostatic precipitator (WESP) system removed hazardous trace elements mainly by capturing fine particles in the flue gas, and a small amount of hazardous trace elements (0.2−26%) were retained in the washing water. The concentrations of Hg in the fine particulates captured by WESP were 16.8−60.1 times of those in the fly ash, which could reach up to 17.5 mg/kg. The application of selective catalytic reduction + LLT-ESP/EFF + WFGD + WESP could effectively control the emission of hazardous trace elements in coal-fired power plants.

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Section: Methodsmentioning

confidence: 99%

Partitioning of Hazardous Trace Elements among Air Pollution Control Devices in Ultra-Low-Emission Coal-Fired Power Plants

et al. 2017

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“…Sequential extraction and magnetic separation were applied [25]. In order to obtain composition information, a dual ion beam (FIB) of the FEI-DualBeamTM Helios 600 NanolabTM, high resolution emission (FEG) for SEM [26][27][28][29], trimmed by lens detectors (TLD), Everhart-Thornley (ETD) and electron backscattered (BSED) were used in this study [30][31][32]. Finally, a high resolution focused Ga+ ion beam to select [33][34][35][36], cut, and obtain an accurate image of a specific region of the species of interest, within the range of 100 nm, was also used [37][38][39][40][41].…”

Section: Methodsmentioning

confidence: 99%

An Analysis of Nanoparticles Derived from Coal Fly Ash Incorporated into Concrete

et al. 2022

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The environmental benefits of incorporating coal fly ash (CFA) into the concrete manufacturing process as a partial substitute for Portland cement are well known. What is less studied is the potential release of CFA derived nanomineral and amorphous nanoparticles during this process of incorporation. A thorough understanding of this makes it possible to understand the risks of exposure to particulates that are harmful to human health when CFA is mixed into concrete. The general objective of this study is to analyze airborne particulates released when CFA is mixed into concrete at the point of manufacture, focusing on the levels of nanominerals, amorphous nanoparticles and hazardous elements (HEs) contained within that are considered harmful to human health. These airborne particulates can be easily inhaled by plant workers in the absence of personal protective equipment. The authors analyzed samples of ash itself and collected actual airborne particulates using self-made passive samplers installed at the manufacturing plant. Regarding the ash analyzed, iron (Fe) was found in large amounts in relation to calcium (Ca), magnesium (Mg) and silicon (Si). The transport, disposal and application of CFA in civil construction projects can provide an increased efficiency and reduce overall costs associated with the production of concrete. However, CFA poses a threat to human health due to the significant amount of HEs, nanominerals, and amorphous nanoparticles found to be released into the environment at the manufacturing plant.

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“…It was also added for the analysis of NPs by HR-TEM. It should be noted that it was not necessary to prepare the collected samples to perform the AM (advanced microscopy) and XRD (X-ray powder diffraction) analyses [8,26,42], which in turn does not cause any change to the molecular structure of the analyzed particles [43][44][45][46][47][48]. The analysis of the collected material was carried out with the X-ray diffractometer NAPLOCK and X-ray Bruker (D8 DISCOVER) to identify the mineral and amorphous phases of the sampled chemical elements [49].…”

Section: Methodsmentioning

confidence: 99%

Indoor Nanoparticle Characterization in Construction Waste Recycling Companies over Time

et al. 2021

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Building activity is a significant source of atmospheric contamination by ultrafine dust. Cognizant of this fact, those active in the use and recycling of construction materials must be aware of the risks associated with exposure to nanoparticles (NPs) and ultra-fine particles (UFPs), as well as the associated health impacts. This work analyzed NPs and UFPs generated in a small building-material recycling company using high-resolution electron microscopes and X-ray Diffraction. A self-made passive sampler (LSPS) that can obtain particulate samples without physical and morphological changes, especially where there is a suspension of particulate material, was used in this study. A total of 96 particulate samples, using the LSPS for three months in four seasons, were collected during the study. Thus, the dry deposition of the particles, which are considered highly harmful to human health, was found in each of the four seasons of the year. It is suggested that for future research, the toxicological evaluations of the particulates in the construction industry should be investigated through the consideration of measures to control and mitigate the health risks of workers regarding exposure to NPs and UFPs.

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Nano-mineralogy of suspended sediment during the beginning of coal rejects spill

Cited by 85 publications

References 25 publications

Partitioning of Hazardous Trace Elements among Air Pollution Control Devices in Ultra-Low-Emission Coal-Fired Power Plants

Partitioning of Hazardous Trace Elements among Air Pollution Control Devices in Ultra-Low-Emission Coal-Fired Power Plants

An Analysis of Nanoparticles Derived from Coal Fly Ash Incorporated into Concrete

Indoor Nanoparticle Characterization in Construction Waste Recycling Companies over Time

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