Multifaceted processes controlling the distribution of hazardous compounds in the spontaneous combustion of coal and the effect of these compounds on human health

Abstract

Pollution generated by hazardous elements and persistent organic compounds that affect coal fire is a major environmental concern because of its toxic nature, persistence, and potential risk to human health. The coal mining activities are growing in the state of Santa Catarina in Brazil, thus the collateral impacts on the health and economy are yet to be analyzed. In addition, the environment is also enduring the collateral damage as the waste materials directly influence the coal by-products applied in civil constructions. This study was aimed to establish the relationships between the composition, morphology, and structural characteristics of ultrafine particles emitted by coal mine fires. In Brazil, the self-combustions produced by Al-Ca-Fe-Mg-Si coal spheres are rich in chalcophile elements (As, Cd, Cu, Hg, Pb, Sb, Se, Sn, and Zn), lithophile elements (Ce, Hf, In, La, Th, and U), and siderophile elements (Co, Cr, Mo, Fe, Ni, and V). The relationship between nanomineralogy and the production of hazardous elements as analyzed by advanced methods for the geochemical analysis of different materials were also delineated. The information obtained by the mineral substance analysis may provide a better idea for the understanding of coal-fire development and assessing the response of particular coal in different combustion processes.

Fostering Children’s Connection to Nature Through Authentic Situations: The Case of Saving Salamanders at School

“…In the environmental psychology literature, connectedness with nature can be seen as a psychological construct that reflects the degree to which individuals perceive that they are part of the natural environment (Schultz, 2001, 2002), and such perception arguably influences adults’ motivations to engage in pro-environmental behavior (Kals et al, 1999; Chawla, 2007; Ernst and Theimer, 2011; Cheng and Monroe, 2012; Liefländer et al, 2013; Mayer and Frantz, 2014; Richardson et al, 2016). For example, environmental activists report greater connectedness with nature compared to college students, suggesting that connectedness with nature may be related to pro-environmental attitudes and behaviors (Bruni and Schultz, 2010).…”

Study on combustion and emission characteristics of chars from low-temperature and fast pyrolysis of coals with TG-MS

“…They believed that the HCN and NH 3 may be produced by HNCO after a series of reactions. In CFB boiler, HNCO released from pyrolysis would quickly decompose into NCO in the combustion chamber [14][15][16], while Miller [17] found that the reaction between NCO and NO reaction was the main source for N 2 O. Therefore, HNCO may be one of the main precursors of N 2 O under fluidized bed combustion.…”

Analyses and prevention of coal spontaneous combustion risk in gobs of coal mine during withdrawal period

“…From Equations 1 and 2, we know that when the porosity is small, permeability decreases with porosity (Peña et al 2017;Oliveira et al 2018;Zhou 2017). O 2 distribution in gob is influenced by porosity.…”