Naslov
Application of alkaline solid residue of electric arc furnace dust for neutralization/purification of electroplating wastewaters

Autori
Elez, Loris ; Oreščanin, Višnja ; Sofilić, Tahir ; Mikulić, Nenad ; Ruk, Damir

Izvornik
Journal of Environmental Science and Health. Part A Toxic/Hazardous Substances and Environmental Engineering (1093-4529) 43 (2008), 12; 1417-1423

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
electric arc furnace dust ; alkaline extraction ; alkaline solid residue ; electroplating wastewater treatment ; mud regeneration

Sažetak
The purpose of thisworkwas development of an appropriate procedure for the neutralization/purification of electroplatingwastewater (EWW) with alkaline solid residue (ASR) by-product of the alkaline extraction of zinc and lead from electric arc furnace dust (EAFD). Removal efficiency of ASR 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 94.92%, 97.58%, 99.59%, 99.48%, 97.25% and 99.97%, respectively. The concentrations of all elements in the purified wastewater were significantly lower in relation to the upper permissible limit for wastewaters suitable for discharge into the environment. The remaining waste mud was regenerated in the strong alkaline medium and successfully applied once again for the neutralization/purification of EWW. Removal efficiencies of heavy metals accomplished with regenerated waste mud were comparable to these achieved by original ASR. Elemental concentrations in the leachates of the waste mud were in acordance with regulated values

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA