Characterization of Elemental Transport from Fly Ash: A Column Study

Abstract

The development of sustainable management practices for coal fly ash requires the understanding of the release of toxic elements from fly ash into the environment. Reactive mass transfer modeling implemented by AQUASIM was able to adequately describe the release and transport of magnesium and cadmium from fly ash. However, the adsorptive interactions between arsenic and carbon residues in fly ash complicated the modeling of the retardation of arsenic transport in fly ash. Selenium was another toxic element exhibited strong retardation in the column leaching study due to adsorptive interactions. The results from this study suggest that processes in addition to reactive mass transfer need to be included to describe the leaching of elements exhibit strong adsorption/desorption characteristics. The modeling approaches reported in this study provide a framework for assessing the release and transport of toxic elements from fly ash during beneficial reuse.

Impact assessment of fly ash on ground water quality: An experimental study using batch leaching tests

“…Also, many researchers have attempted to understand the amount and nature of pollutants in fly ash and their trace element mobility (leaching behaviour), so as to provide a sustainable solution to the problem at an appropriate time (Akar et al, 2012; Akinyemi et al, 2011; Baba and Kaya, 2004; Becker et al, 2013; de Groot et al, 1989; Dutta et al, 2009; Fleming et al, 1996; Ghosh and Subbarao, 1998; Guru et al, 2014; Hjelmar, 1990; Iyer, 2002; Izquierdo and Querol, 2012; Jegadeesan et al, 2008; Khodadoust et al, 2011; Manjare et al, 2005; Nayak and Panda, 2010; Neupane and Donahoe, 2013; Praharaj et al, 2002; Ram et al, 2007; Sarode et al, 2010; Bin-Shafique et al, 2006; Singh et al, 2014a; Tsiridis et al, 2015; Wang et al, 2009; Xiang et al, 2012; Zhu and He, 2014).…”