Micro- and nanochemistry of fly ash from a coal-fired power plant

Gieré, Reto; Carleton, Loran E.; Lumpkin, Gregory R.

doi:10.1515/energyo.0002.00001

Cited by 4 publications

(4 citation statements)

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“…The concentration of Cu, Mn, Ni, and Zn in fly ash can be 30 times higher than in coal, making fly ash the main threat for the surrounding environment and human health [44]. In our study, the total concentrations of Ni in all rhizospheric fly ash samples were toxic (12-34 μg/g, [45]), the concentrations of Cu were within the normal range (13-24 μg/g, [45]) whereas the concentrations of Mn and Zn were deficient (270-525 μg/g and 45-100 μg/g, respectively [45]).…”

Section: Discussionmentioning

confidence: 99%

Allelopathic potential of selected woody species growing on fly-ash deposits

Grbović

Gajić

Branković

et al. 2019

ARCH BIOL SCI BELGRA

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The objective of this study was to determine the allelopathic potential of Robinia pseudoacacia L., Ailanthus altissima (Mill.) Swingle and Amorpha fruticosa L. that grow on the fly-ash deposits at the "Nikola Tesla-A" thermoelectric power plant in Obrenovac. The chemical characteristics of fly ash, such as pH, electrical conductivity (EC), content of carbon (C) and nitrogen (N), contents of available phosphorus (P 2 O 5) and potassium (K 2 O), the contents of total and available Fe, Cu, Mn, Ni and Zn as well as of phenolic acids (3,5 dihydroxybenzoic acid (3,5-DHBA) and ferulic acid) and flavonoids (rutin and quercetin) were analyzed in control fly ash (bare zones without vegetation cover) and plant rhizospheric fly ash. In order to determine the allelopathic activity of phenolic compounds in fly ash, modified soil sandwich allelopathic biotests were performed, and Trifolium pratense L. (red clover) was used as the indicator species. A. fruticosa showed the highest allelopathic activity, followed by A. altissima whereas R. pseudoacacia showed the lowest allelopathic potential. Negative correlation was noted between radicle and hypocotyl growth inhibition of red clover and the pH of fly ash. Positive correlations were found between radicle growth inhibition and the content of C, P 2 O 5 , total concentrations of Cu, available concentrations of Mn and Ni, the contents of ferulic acid, 3,5-DHBA, and rutin. Our results indicate that A. fruticosa and A. altissima increased the content of phenolics in fly ash, which can act as allelochemicals leading to radicle growth inhibition of red clover in the pioneer plant community on fly-ash deposits. These woody species that colonized fly-ash deposits can initiate the beginning of pedogenetic processes altering the ecosystem processes at degraded sites.

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Section: Discussionmentioning

confidence: 99%

Allelopathic potential of selected woody species growing on fly-ash deposits

Grbović

Gajić

Branković

et al. 2019

ARCH BIOL SCI BELGRA

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“…However, Kolay and Singh [7] discussed the impacts of toxic contaminants on the environment. Also FA uses in soil treatment, as conditioners or filler material for low-lying wastelands, in refuse dumps reclamation, and construction or geotechnical secondary raw materials [8,9] has increased their potential geo-environmental impact. Therefore, the use of FA provides economic benefits by reducing disposal costs and negative environmental effects through engineering applications.…”

Section: Introductionmentioning

confidence: 99%

Physical and Geotechnical Properties of Tropical Peat and Its Stabilization

Kolay¹,

Taib²

2018

Peat

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The chapter presents the physical and engineering properties of tropical peat treated with various types of stabilizers. Quick lime (QL), fly ash (FA), and ordinary Portland cement (OPC) were used as stabilizers. The amounts of QL, FA, and OPC added with the peat samples are in the range of 2-8, 5-20, and 5-20%, respectively. Various physical or index and engineering tests have been conducted to characterize the peat samples. Unconfined compressive strength (UCS) tests were conducted on original and treated peat samples cured for 7, 14, and 28 days. The results show that the UCS value increases with the increase of all stabilizers used and with curing period. The UCS tests were also conducted on the peat samples with the combination of QL and FA to study the combined effects of the stabilizers. The present study established different correlations between physical and engineering properties of original peat and UCS results on treated peat samples with different types of stabilizers. Geotechnical engineers can refer to these correlations to determine the bearing capacity of treated peat. In addition, scanning electron microscope (SEM) studies were conducted on original and treated peat samples to investigate the microstructure of the samples.

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“…CFA is a diverse mixture of particles containing aluminum, silicon, calcium, magnesium, and iron oxides that can readily adsorb ligands and proteins ( Borcherding et al 2013 ; Gieré et al 2003 ; Vertegel et al 2004 ; Vogler 2012 ). Therefore, we hypothesized that CFA interacts with ASL AMPs and impairs their antimicrobial activity.…”

Section: Introductionmentioning

confidence: 99%

Effects of Coal Fly Ash Particulate Matter on the Antimicrobial Activity of Airway Surface Liquid

Buonfiglio¹,

Mudunkotuwa

Alaiwa³

et al. 2017

Environ Health Perspect

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Background:Sustained exposure to ambient particulate matter (PM) is a global cause of mortality. Coal fly ash (CFA) is a byproduct of coal combustion and is a source of anthropogenic PM with worldwide health relevance. The airway epithelia are lined with fluid called airway surface liquid (ASL), which contains antimicrobial proteins and peptides (AMPs). Cationic AMPs bind negatively charged bacteria to exert their antimicrobial activity. PM arriving in the airways could potentially interact with AMPs in the ASL to affect their antimicrobial activity.Objectives:We hypothesized that PM can interact with ASL AMPs to impair their antimicrobial activity.Methods:We exposed pig and human airway explants, pig and human ASL, and the human cationic AMPs β-defensin-3, LL-37, and lysozyme to CFA or control. Thereafter, we assessed the antimicrobial activity of exposed airway samples using both bioluminescence and standard colony-forming unit assays. We investigated PM-AMP electrostatic interaction by attenuated total reflection Fourier-transform infrared spectroscopy and measuring the zeta potential. We also studied the adsorption of AMPs on PM.Results:We found increased bacterial survival in CFA-exposed airway explants, ASL, and AMPs. In addition, we report that PM with a negative surface charge can adsorb cationic AMPs and form negative particle–protein complexes.Conclusion:We propose that when CFA arrives at the airway, it rapidly adsorbs AMPs and creates negative complexes, thereby decreasing the functional amount of AMPs capable of killing pathogens. These results provide a novel translational insight into an early mechanism for how ambient PM increases the susceptibility of the airways to bacterial infection. https://doi.org/10.1289/EHP876

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Micro- and nanochemistry of fly ash from a coal-fired power plant

Cited by 4 publications

References 0 publications

Allelopathic potential of selected woody species growing on fly-ash deposits

Allelopathic potential of selected woody species growing on fly-ash deposits

Physical and Geotechnical Properties of Tropical Peat and Its Stabilization

Effects of Coal Fly Ash Particulate Matter on the Antimicrobial Activity of Airway Surface Liquid

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