Potentially toxic elements in fly ash dependently of applied technology of hard coal combustion

2018 ◽  
Vol 25 (25) ◽  
pp. 25091-25097 ◽  
Author(s):  
Danuta Smolka-Danielowska ◽  
Dorota Fiedor
Keyword(s):  
Fly Ash ◽  
Coal Combustion ◽  
Toxic Elements ◽  
Potentially Toxic Elements ◽  
Hard Coal ◽  
Applied Technology

PAHs and potentially toxic elements in the fly ash and bed ash of biomass fired power plants

2015 ◽  
Vol 132 ◽  
pp. 139-152 ◽  
Author(s):  
Reginald E. Masto ◽  
Elina Sarkar ◽  
Joshy George ◽  
Kumari Jyoti ◽  
Pashupati Dutta ◽  
...  
Keyword(s):  
Fly Ash ◽  
Power Plants ◽  
Toxic Elements ◽  
Potentially Toxic Elements

scholarly journals Identification of Technogenic Magnetic Particles and Forms of Occurrence of Potentially Toxic Elements Present in Fly Ashes and Soil

Minerals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1066
Author(s):  
Małgorzata Wawer
Keyword(s):  
Power Plants ◽  
Toxic Elements ◽  
Magnetic Particles ◽  
Dust Emission ◽  
Potentially Toxic Elements ◽  
Residual Fraction ◽  
Hard Coal ◽  
Iron Minerals ◽  
Technogenic Magnetic Particles ◽  
A Share

Solid fossil fuel power plants are the main source of energy in Poland. In 2018, the most important energy carrier was hard coal with a share of 57.9%, followed by lignite with a share of 18.1%. In addition to CO2, NOx and SOx, the combustion of fossil fuels produces dusts containing, among others, potentially toxic elements (PTEs), e.g., Pb, Zn, Cu, Cr, Cd. Although the currently operating power plants have efficient filter systems, the total dust emission in Poland in 2017 amounted to 341,000 t, of which approximately 36,000 t was from the power plants. PTEs present in the power plant dust are often accompanied by technogenic magnetic particles (TMPs)—mainly iron oxides and hydroxides formed in high-temperature technological processes as a result of the transformations of iron minerals contained in raw materials and additives. The presence of magnetic iron minerals (e.g., magnetite, hematite, maghemite, metallic iron) in the tested ashes from hard coal and lignite power plants was confirmed by scanning electron microscopy with energy dispersive spectroscopy (SEM/EDS) analysis. The sequential extraction analysis showed that most of the analyzed PTEs found in dust after hard coal combustion were mainly related to amorphous and crystalline FeOx or in the residual fraction and in dust after lignite combustion, mainly in the most mobile fractions.

scholarly journals Adsorption of As, B, Cr, Mo and Se from coal fly ash leachate by Fe3+ modified bentonite clay

2015 ◽  
Vol 6 (3) ◽  
pp. 382-391 ◽  
Author(s):  
Masindi Vhahangwele ◽  
Gitari W. Mugera ◽  
Tutu Hlanganani
Keyword(s):  
Fly Ash ◽  
Toxic Elements ◽  
Coal Fly Ash ◽  
Bentonite Clay ◽  
Potentially Toxic Elements ◽  
Subsurface Water ◽  
Modified Bentonite ◽  
Adsorption Affinity ◽  
Adsorbate Concentration ◽  
Five Elements

Fly ash contains the potentially toxic elements As, B, Cr, Mo and Se which upon contact with water may be leached to contaminate surface and subsurface water bodies. This study aims to evaluate the adsorption of these elements from coal fly ash leachates on Fe3+-modified bentonite (Fe-Bent); such modification improved the physicochemical properties of bentonite clay. For optimization of adsorption of the five elements, the effects of time, adsorbent dosage, adsorbate concentration, and pH were optimized. Adsorption affinity of oxyanions followed in the order B = Se > Mo > Cr = As. Experimental data fitted well to Langmuir and Freundlich adsorption isotherms.

LEACHING OF POTENTIALLY TOXIC ELEMENTS FROM ALASKAN STOKER-BOILER FLY ASH

2020 ◽  
Author(s):  
Sarah Hayes ◽  
◽  
Kyle P. Milke ◽  
Kiana Mitchell ◽  
Jennifer Guerard
Keyword(s):  
Fly Ash ◽  
Toxic Elements ◽  
Potentially Toxic Elements ◽  
Boiler Fly Ash

scholarly journals Fly ash from energy production – a waste, byproduct and raw material

2015 ◽  
Vol 31 (4) ◽  
pp. 139-150 ◽  
Author(s):  
Alicja Uliasz-Bocheńczyk ◽  
Maciej Mazurkiewicz ◽  
Eugeniusz Mokrzycki
Keyword(s):  
Fly Ash ◽  
Fluidized Bed ◽  
Coal Combustion ◽  
Power Plants ◽  
Building Materials ◽  
Underground Mining ◽  
Raw Material ◽  
Hard Coal ◽  
Total Recovery ◽  
Fluidized Bed Boilers

Abstract Limited use of biomass has been observed in recent years. The processes of electricity and heat production in conventional boilers and fluidized bed boilers generate waste – mainly fly ash. This waste is traditionally used in many industries. The most important are: mining, production of building materials (including cement) and road construction. The use of fly ash in underground mining (suspension technology) is a method of fly ash recovery, which is typical for the Polish industry. The amount of fly ash (10 01 02) and waste (10 01 82) including ashes from fluidized bed boilers in the year 2012 amounted to 1,490.7 thousand tons. For many years, fly ashes from hard coal combustion in conventional boilers has also been used in various production technologies of building materials, such as: cement, concrete, building ceramics and lightweight aggregates. The ashes from hard coal combustion in fluidized bed boilers are also used in the production of cement and autoclaved aerated concrete. Due to extensive economic use, commercial power plants started to reclassify fly ash from hard coal combustion, turning waste into a by-product after meeting the requirements of the Act on waste of 14 December 2012. The ashes from the co-combustion of biomass are also used. The utilization of fly ash from lignite combustion, both from conventional boilers and fluidized bed boilers, is a cause of concern, while the total recovery of fly ash from the combustion of hard coal and lignite has decreased in recent years. For this reason, studies on the use of traditional fly ash technologies such as the production of building materials and new fly ash technologies such as the use as sorbents in power generation and wastewater treatment, as well as on binding CO2 through mineral sequestration in the Carbon Capture and Utilization, are being carried out.

scholarly journals Current Status and Temporal Trend of Potentially Toxic Elements Pollution in Agricultural Soil in the Yangtze River Delta Region: A Meta-Analysis

2021 ◽  
Vol 18 (3) ◽  
pp. 1033
Author(s):  
Shufeng She ◽  
Bifeng Hu ◽  
Xianglin Zhang ◽  
Shuai Shao ◽  
Yefeng Jiang ◽  
...  
Keyword(s):  
Yangtze River ◽  
Agricultural Soil ◽  
Toxic Elements ◽  
Temporal Trend ◽  
Meta Analysis ◽  
Yangtze River Delta ◽  
Potentially Toxic Elements ◽  
River Delta ◽  
The Yangtze River ◽  
The Yangtze River Delta

Potentially toxic elements (PTEs) pollution in the agricultural soil of China, especially in developed regions such as the Yangtze River Delta (YRD) in eastern China, has received increasing attention. However, there are few studies on the long-term assessment of soil pollution by PTEs over large regions. Therefore, in this study, a meta-analysis was conducted to evaluate the current state and temporal trend of PTEs pollution in the agricultural land of the Yangtze River Delta. Based on a review of 118 studies published between 1993 and 2020, the average concentrations of Cd, Hg, As, Pb, Cr, Cu, Zn, and Ni were found to be 0.25 mg kg−1, 0.14 mg kg−1, 8.14 mg kg−1, 32.32 mg kg−1, 68.84 mg kg−1, 32.58 mg kg−1, 92.35 mg kg−1, and 29.30 mg kg−1, respectively. Among these elements, only Cd and Hg showed significant accumulation compared with their background values. The eastern Yangtze River Delta showed a relatively high ecological risk due to intensive industrial activities. The contents of Cd, Pb, and Zn in soil showed an increasing trend from 1993 to 2000 and then showed a decreasing trend. The results obtained from this study will provide guidance for the prevention and control of soil pollution in the Yangtze River Delta.

Sign in / Sign up

Export Citation Format

Share Document