Removal of heavy metals from wastewater using CFB-coal fly ash zeolitic materials

Synergistic Sintering of Lignite Fly Ash and Steelmaking Residues towards Sustainable Compacted Ceramics

“…The sintered mixture (FA-EAFD-LFS) also contains an amorphous phase, which becomes evident from a hump in the pattern recorded between 2 = 30 ∘ and 2 = 35 ∘ (Figure 2). The occurrence of amorphous phase may be mainly ascribed to bloating of LFS particles and secondarily to the aluminosilicate glass which is present in FA [27,28].…”

Reduction of Toxic Element Mobility in Mining Soil by Zeolitic Amendments

“…The CFA was converted to synthetic zeolitic material (FAZ) via a low temperature alkaline hydrothermal treatment with 1M NaOH. The hydrothermal treatment, proposed by Koukouzas et al (2010) and Itskos et al (2015) took place at 90-100 0 C. The zeolite produced was Na-P1(Na6Al6Si10O32·12H2O), a synthetic mineral with high ion exchange capacity due to the substitution of Si (IV) by Al (III) in its structure, which results in an increased overall negative charge. Heavily contaminated soil samples (LSoil) were collected near the Lavrion harbor, (Figure 1).…”

“…The fly ash low temperature hydrothermal zeolitization processes implemented in the present study, are based on the chemical attack of Al-Si bearing phases of the fly ash by alkaline solutions and the subsequent transformation to zeolitic material (Querol et al, 2002;Mouhtaris et al, 2003;Koukouzas et al, 2010 andItskos et al, 2015). Products of such transformation have been described by better ion-exchange properties and several fold-enlarged surfaces (Remenarova et al, 2014 andGiannatou et al, 2015).…”

Opportunities and challenges in the use of coal fly ash for soil improvements – A review

“…One of such alternative sorbents is CFA, which has received special attention as an economical sorbent for removing trace elements from wastewater due to its abundance and easy availability. Numerous studies on the efficiency of CFA on the sorption and removal of PTEs from aqueous solutions and wastewater streams (Gupta and Torres, 1998;Weng and Huang, 2004;Alinnor, 2007;Pehlivan and Cetin, 2007;Wang et al, 2007;Aydin et al, 2008;Koukouzas et al, 2010) have shown that CFA can be used in wastewater treatment because of its major chemical components such as alumina, silica, ferric oxide, calcium oxide, magnesium oxide, and carbon, and its physical properties, such as fine particle size and high surface area, which together make CFA a strong sorbent of both organic and inorganic contaminants. Table 4 summarizes results of the use of CFA for PTEs removal from wastewaters.…”