Możliwość Wykorzystania Popiołów Lotnych W Celu Poprawy Odwadniania Osadów Ściekowych

Wójcik, Marta; Stachowicz, Feliks; Masłoń, Adam

doi:10.7862/rb.2017.35

Cited by 5 publications

(7 citation statements)

References 14 publications

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“…The FA (HC) sample displayed higher contents of fused, dense, and anisotropic particulate C-residues than the FA (SRF) sample (Figures 4 and 5), because of the high molecular ordering of coal, which can create anisotropic char in high temperatures. These features indicate that quite a significant part of the unburned C-residues (i.e., highly anisotropic particles) resembled a coal-derived coke-texture, meaning that part of the vitrinite grains escaped with flue gasses from combustion chamber as pyrolyzed and not yet combusted particles [1,13,27,29]. On the contrary, the isotropic fraction originated from the inertinite particles of the raw coal-feed.…”

Section: Organic Petrographical Featuesmentioning

confidence: 99%

“…In summer of 2020 Poland also overtook Germany for the first time, in terms of coal usage, as the country relies on coal to provide 74% of the country's electricity. As a result, about 4.2 Mt of fly ash is produced annually from the combustion of fossil fuels and/or co-combustion with biomass, with only a small part (<10%) of this fly ash being transferred to the recycling process, particularly in the construction sector [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Organic Petrographical Features of Fly Ashes Originating from Coal and Coal-SRF Co-Combustion

2021

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In this study, the features of fly ashes originating from industrial-scale high volatile bituminous coal combustion and co-combustion of coal with 10% admixture of alternative fuel SRF (solid recovered fuel) are presented, with emphasis on the organic petrographical characteristics. The organic petrographical and mineralogical data are co-evaluated with geochemical data, with the aim to provide a full classification of the studied fly ashes, as well as base information toward any potential application of this waste material, according to the recycling economy principles. By applying organic petrographical methods, the assignment of the carbon-rich residuals to the respective feed fuel, either coal or SRF, can be achieved. The obtained quantitative evaluation provides useful information regarding the combustion conditions in the stoker boiler. The analyzed fly ashes contain significant C-residuals, mostly in the form of fused, dense, and anisotropic particles, while the enrichment in sooty particles is caused due to the addition of SRF fuel. In conjunction with the moderate-low content of potential hazardous elements, the features of the contained C-residual phases suggest that these fly ashes could possibly be the subject of further studies for their applicability as soil improvements.

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Section: Organic Petrographical Featuesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Organic Petrographical Features of Fly Ashes Originating from Coal and Coal-SRF Co-Combustion

2021

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“…Fly ash and waste mineral wool can be used as structural materials [Żukowska et al, 2021;Myszura-Dymek and Żukowska, 2023]. Fly ash, due to its sorption properties, shows high effectiveness in sludge treatment processes, especially by intensifying the efficiency of the dewatering process [Zheng and Haifeng, 2010;Wójcik et al, 2017]. Research results also indicate that fly ash, due to its alkalising properties [Gomes et al, 2016] and the presence of reactive CaO, can be used as a reagent for sludge hygienization.…”

Section: Introductionmentioning

confidence: 99%

Properties of Organic Matter in Composts Based on Sewage Sludge

Myszura-Dymek

2024

J. Ecol. Eng.

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The aim of the research was to assess the quality of organic matter contained in sewage sludge composting products and their co-composting with fly ash and mineral wool. The object of the research were composts produced using stabilized sewage sludge from the municipal sewage treatment plant (SS_1C) and sewage sludge with the addition of 20% (SSF_2C) and 30% (SSF_3C) of fly ash and 5% (SSW_4C) and 10% (SSW_5C) of mineral wool. Selected physicochemical properties, fractional composition of humic compounds, and the degree and rate of humification were determined in compost samples taken after 180 days of composting. The reaction of the evaluated composts was close to optimal for mature composts. Co-composting of sewage sludge with mineral wool and ash increased the sorption capacity in composts compared to SS_1C. Due to the content of available P and Mg, the discussed composts formed the SS_1C>SSF_2C and SSF_3C>SSW_4C and SSW_5C series. However, in terms of available K content: SSF_2C and SSF_3C>SSW_4C and SSW_5C>SS_1C. In the SS_1C compost the organic carbon (TOC) content was slightly higher, but no statistically significant effect of the addition of fly ash and mineral wool on the TOC content in mature composts was confirmed. The addition of ash and mineral wool significantly increased the total nitrogen content. Due to the humification index, the composts formed the series: SSW_4C > SSW_5C > SSF_2C > SS_1C > SSF_3C. The values of the C-KH/C-KF ratio in SS_1C were typical for good quality soils, while in the remaining composts the C-KH/C-KF values were slightly lower. The degree of humification of the assessed composts was characterized by poorly humified organic materials, with the highest values of this indicator found in composts with the addition of mineral wool. The assessed quality indicators of organic matter indicate that the organic matter of composts from sewage sludge with the addition of mineral wool and 100% sludge was of the highest quality.

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“…It is estimated that about 4.2 million tons of volatile fluidized ash (VFA) is produced in Poland annually (Stoch, 2015;Wójcik et al, 2017). So far, this ash is used mainly in construction, land reclamation works, cement plants and mining.…”

Section: Introductionmentioning

confidence: 99%

Archives of Mining Sciences

Proksa,

Łączny,

Bzowski

2020

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The application of fluidized fly ash in underground mining excavations is limited due to its significant content of free calcium and calcium sulfate. In order to increase the amount of utilized fly ash from fluidized beds, it should be converted to a product with properties that meet the requirements for mining applications. This research presents the results of an attempt to adapt fluidized fly ashes for use in underground mining techniques, by means of carbonation and granulation. Carbonation was performed with the use of technical carbon dioxide and resulted in the reduction of free calcium content to a value below 1%. Granulation on the other hand, resulted in obtaining a product with good physical and mechanical parameters. The performed mineralogical and chemical studies indicate that trace amounts of "binding" phases, such as basanite and/or gypsum are present in the carbonized ash. The addition of water, during the granulation of carbonized fluidized fly ash, resulted in changes in the mineral phases leading to the formation of ettringite and gypsum as well as the recrystallization of the amorphous substance. It was confirmed that the carbonization and granulation of flying fluidized ashes positively affects the possibility of using these ashes in underground mining excavations.

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Możliwość Wykorzystania Popiołów Lotnych W Celu Poprawy Odwadniania Osadów Ściekowych

Cited by 5 publications

References 14 publications

Organic Petrographical Features of Fly Ashes Originating from Coal and Coal-SRF Co-Combustion

Organic Petrographical Features of Fly Ashes Originating from Coal and Coal-SRF Co-Combustion

Properties of Organic Matter in Composts Based on Sewage Sludge

Archives of Mining Sciences

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