Characterization of CFB-coal fly ash zeolitic materials and their potential use in wastewater treatment

Koukouzas, N; Vasilatos, C; Itskos, GS; Moutsatsou, A

dc.contributor.author	Koukouzas, N	en
dc.contributor.author	Vasilatos, C	en
dc.contributor.author	Itskos, GS	en
dc.contributor.author	Moutsatsou, A	en
dc.date.accessioned	2014-03-01T02:51:57Z
dc.date.available	2014-03-01T02:51:57Z
dc.date.issued	2009	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/35774
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-74849096876&partnerID=40&md5=06070554f05e54b22c4d09b6aec9be7d	en
dc.subject	CFB	en
dc.subject	Coal fly ash	en
dc.subject	Heavy metals	en
dc.subject	Synthetic zeolites	en
dc.subject	Water treatment	en
dc.subject.other	Analytical methodology	en
dc.subject.other	Cation exchange capacities	en
dc.subject.other	CFB	en
dc.subject.other	Chemical compositions	en
dc.subject.other	Coal fly ash	en
dc.subject.other	Energy dispersive x-ray	en
dc.subject.other	Industrial wastewaters	en
dc.subject.other	Liquid wastes	en
dc.subject.other	Macro-porosity	en
dc.subject.other	Main parameters	en
dc.subject.other	Mineralogical compositions	en
dc.subject.other	NaOH solutions	en
dc.subject.other	Pilot scale	en
dc.subject.other	Scanning Electron Microscope	en
dc.subject.other	Specific gravity	en
dc.subject.other	Synthetic zeolites	en
dc.subject.other	Work Focus	en
dc.subject.other	X ray fluorescence	en
dc.subject.other	Zeolite-A	en
dc.subject.other	Zeolitic materials	en
dc.subject.other	Aluminum	en
dc.subject.other	Calcium	en
dc.subject.other	Chromium	en
dc.subject.other	Coal	en
dc.subject.other	Coal ash	en
dc.subject.other	Coal combustion	en
dc.subject.other	Coal industry	en
dc.subject.other	Density (specific gravity)	en
dc.subject.other	Fluidization	en
dc.subject.other	Fluidized bed combustion	en
dc.subject.other	Fluidized beds	en
dc.subject.other	Fly ash	en
dc.subject.other	Heavy water	en
dc.subject.other	Hydrates	en
dc.subject.other	Leaching	en
dc.subject.other	Lead	en
dc.subject.other	Materials testing	en
dc.subject.other	Metals	en
dc.subject.other	Scanning electron microscopy	en
dc.subject.other	Silicate minerals	en
dc.subject.other	Silicon	en
dc.subject.other	Synthetic metals	en
dc.subject.other	Waste incineration	en
dc.subject.other	Wastewater	en
dc.subject.other	Wastewater reclamation	en
dc.subject.other	Wastewater treatment	en
dc.subject.other	X ray diffraction	en
dc.subject.other	Zeolites	en
dc.subject.other	Zinc	en
dc.subject.other	Chemicals removal (water treatment)	en
dc.title	Characterization of CFB-coal fly ash zeolitic materials and their potential use in wastewater treatment	en
heal.type	conferenceItem	en
heal.publicationDate	2009	en
heal.abstract	Two different fly ash (FA) samples were tested for their ability to give synthetic zeolitic products. Polish bituminous (PB) and South African (SA) coal fly ash (FA) samples, derived from pilot-scale circulated fluidized bed (CFB) combustion facilities, have been utilized as raw materials. The two FAs underwent a hydrothermal activation with 1M NaOH solution at 90°C for 24 h. Two different FA/NaOH solution/ratios (50, 100 g/L) were applied for each sample and the following zeolitic materials were formed: Na-Al-Si Zeolite A (Na), K-Al-Si Zeolite A (K), Erionite, ZSM-18, K-Ca-Al-Si-Hydrate Unnamed Zeolite, Erionite and Linde (L). The experimental products were characterized by means of X-Ray Diffraction (XRD) and Energy Dispersive X-Ray coupled-Scanning Electron Microscope (EDX/SEM), while X-Ray Fluorescence (XRF) was applied for the determination of their chemical composition. The zeolitic products were also evaluated in terms of their cation exchange capacity (CEC), specific surface area (SSA), specific gravity (SG), particle size distribution (PSD), pH and the range of their micro- and macroporosity. The current work focuses on testing the synthesized zeolitic materials for their potential of retaining heavy metals from industrial wastewater. Therefore, the aforementioned products were tested for their ability of adsorbing Cr, Pb, Ni, Cu, Cd and Zn from contaminated liquids, by the use of instrumental analytical methodologies. It must be noticed that the main goal is the treatment of liquid waste with such by-products and the capability of the zeolitic material to inhibit the leaching of the metals. Main parameters, as it is concluded from the experimental results, are the mineralogical composition of the initial fly ashes, as well as the type and the amount of the produced zeolite and specifically the mechanism by which the metals ions are hold on the substrate.	en
heal.journalName	3rd World of Coal Ash, WOCA Conference - Proceedings	en