Naslov
Purification of zinc plating wastewater using alkaline residue of electric arc furnace dust

Autori
Elez, Loris ; Oreščanin, Višnja ; Lovrenčić Mikelić, Ivanka ; Sofilić, Tahir ; Mikulić, Nenad

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
The 11th European Meeting on Environmental Chemistry (EMEC 11) : Book of abstracts / Trebše, Polonca ; Petrič, Marta ; Lavtižar, Vesna - Nova Gorica, 2010, 200-200

ISBN
978-961-6311-66-3

Skup
European Meeting on Environmental Chemistry (11 ; 2010)

Mjesto i datum
Portorož, Slovenija, 08.12.2010. - 11.12.2010

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
waste water; EAF dust; purification

Sažetak
The purpose of this work was development of an appropriate procedure for the purification of zinc plating wastewater (ZPW) with alkaline solid residue (ASR) by-product of the alkaline extraction of zinc and lead from various types of electric arc furnace dust (EAFD). Removal efficiency of alkaline solid residue at optimum purification conditions (pH 8 and mixing time ; 20 minutes) for the elements Pb, Cr (VI), Cr (III), Fe, Ni, Cu and Zn were 99.17 %, 100 %, 100 %, 99.88 %, 100 %, 99.69 % and 99.95 %, respectively. The concentrations of all elements in the purified wastewater were significantly lower in relation to the upper permissible limit. The remaining waste mud was regenerated in the strong alkaline medium and successfully applied once again for the purification of zinc plating wastewater. Removal efficiencies of heavy metals accomplished with regenerated waste mud were comparable to these achieved by original alkaline solid residue. Elemental concentrations in the eluates of the waste mud were in accordance with regulated values. There was no progressive increase in toxicity of waste mud after its regeneration and repeated usage for zinc plating effluent purification which justified closed cycle of: EAFD alkaline extraction - usage of remaining alkaline solid residue for zinc plating effluent purification - regeneration of waste mud by alkaline extraction - usage of solid residue of waste mud for zinc plating effluent purification. Conducted research confirmed successful application of toxic waste from one industry for the treatment of waste from other industrial processes.

Izvorni jezik
Engleski

Znanstvena područja
Temeljne tehničke znanosti

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