Preparation of an Aluminum and Iron‐Based Coagulant From Fly Ash for Industrial Wastewater Treatment

Abstract

Fly ash was investigated to produce a composite coagulant containing aluminum (Al) and iron (Fe) salts through the calcination and leaching processes. The extraction of Al and Fe oxides from fly ash demonstrated similar results for HCl and H2SO4 leaching. Besides, the calcination pretreatment of fly ash (without any additive) was found to be less effective in extraction. However, the conversion efficiencies of Al and Fe were affected greatly by calcination pretreatment with addition of Na2CO3, and leaching conditions of ratio of solution to fly ash (L/S) and H+ concentration. The maximum concentrations of Al and Fe solubilized from fly ash were 0.21 and 0.04 mol/L, respectively, which were attained by calcination pretreatment using an optimal mass ratio (ca. 1:16.7) of Na2CO3 to fly ash at 805°C. These concentrations correspond to conversion efficiencies of 31.2% for Fe and 18.3% for Al in the fly ash. The slurry was filtrated to obtain a solution containing Al‐ and Fe‐sulfates and silicates. The Al/Fe/Si mole ratio indicated the feasibility of further production of inorganic polymer coagulant. The produced coagulant was determined to be effective for treating soybean wastewater and dairy wastewater in terms of COD and SS removal.

Adsorption of Cd(II) on mesoporous Al2O3 prepared from high-aluminum fly ash

“…First, HAFA was activated and pretreated [20]. HAFA and Na 2 CO 3 were uniformly mixed at a mass ratio of 1:1, and the mixture was transferred to a nickel crucible and calcined at a temperature of 900 °C for 90 min in a boxtype resistance furnace.…”

Separation of Dissolved Organic Matter (DOM) and Per- and Polyfluoro-Alkyl Substances (PFAS) from Landfill Leachate Using Modified Coal Fly-Ash (CFA)

“…According to a report in 2010 by American Coal Ash Association, the use of CFA in construction industry was found to be 43% (American Coal Ash Association, 2010). Application of CFA has also been found in wastewater treatment such as removal of organic matter (COD & BOD) and suspended solids (Ahmaruzzaman, 2009;Andersson et al, 2012;Devi and Dahiya, 2006;Hu et al, 2017;Laohaprapanon et al, 2010; "Removal of sulfonated humic acid from aqueous phase by modified coal fly ash waste," 2016; Ugurlu et al, 2005;Yan et al, 2012;Zaharia and Suteu, 2013;Zhao et al, 2013). However, in each of these studies, CFA was treated or modified prior to wastewater treatment application.…”

Kajian Pemanfaatan Koagulan Recovery Aluminium Dan Besi Dari Abu Terbang

“…Ada beberapa penelitian terkait potensi pemanfaatan limbah abu terbang. Salah satu penelitian yang telah dilakukan adalah memanfaatkan limbah abu terbang untuk keperluan bahan komposit koagulan (Hu et al, 2017;Yan et al, 2012). Komposisi kimia abu terbang didominasi oleh kandungan oksida berupa SiO2, Al2O3, Fe2O3, dan CaO.…”

“…Kandungan Al2O3 dan Fe2O3 ini dimanfaatkan oleh peneliti sebagai sumber mineral komposit koagulan untuk pengolahan limbah industri maupun domestik (Mushtaq et al, 2019;Hu et al, 2015;Yan et al, 2015). Koagulan hasil recovery aluminium dan besi dari abu terbang dengan asam sulfat berupa Fe2(SO4)3, Al2(SO4)3 maupun polimer (Fan et al, 2003;Hu et al, 2015;Hu et al, 2017;Li et al, 2009;Sun et al, 2011;Valeev et al, 2018). Sedangkan koagulan hasil recovery aluminium dan besi dari abu terbang dengan asam klorida berupa FeCl3, AlCl3 maupun polimer (Hu et al, 2017;Yan et al, 2012;Yan et al, 2015).…”