Green industry work: production of FeCl 3 from iron and steel industry waste (mill scale) and its use in wastewater treatment.

Autor: Solmaz A; Department of Environmental Protection and Control-Iskenderun Vocational School of Higher Education, Iskenderun Technical University, Hatay, Turkey. alper.solmaz@iste.edu.tr., Bölükbaşi ÖS; Department of Metallurgy and Materials Engineering, Faculty of Engineering and Natural Sciences, Iskenderun Technical University, 31200, Hatay, Turkey., Sari ZA; Department of Metallurgy-Iskenderun Vocational School of Higher Education, Iskenderun Technical University, Hatay, Turkey.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2024 Mar; Vol. 31 (13), pp. 19795-19814. Date of Electronic Publication: 2024 Feb 17.
DOI: 10.1007/s11356-024-32451-6
Abstrakt: Mill scale (MS) is considered to be a significant metallurgical waste, but there is no economical method yet to utilize its metal content. In this study, which covers various processes in several stages, the solution of iron in MS, which is the Iron and Steel Industry (I&SI) waste, as FeCl 3 (MS-FeCl 3 ) in the thermoreactor in the presence of HCl, was investigated. In the next step, the conditions for using this solution as a coagulant in the treatment of I&SI wastewater were investigated using the jar test. The results of the treated water sample were compared by chemical oxygen demand (COD), total suspended solids (TSS), color, and turbidity analyses using commercial aluminum sulfate (Al 2 (SO 4 ) 3 ) and FeCl 3 (C-FeCl 3 ). Additionally, heavy metal analyses were conducted, and the treatment performance of three coagulants was presented. Accordingly, while 2.0 mg/L anionic polyelectrolyte was consumed at a dosage of 4.05 mg/L Al 2 (SO 4 ) 3 at pH 7.0, 0.25 mg/L anionic polyelectrolyte was consumed at a dosage of 1.29 mg/L at pH 5.0 in the C-FeCl 3 and MS-FeCl 3 studies. Also, Fe, Cr, Mn, Ni, Zn, Cd, Hg, and Pb removal efficiencies were over 93.56% for all three coagulant usage cases. The results showed that the wastewater treatment performance of MS-FeCl 3 by the recycling of MS, which is an I&SI waste, was at the same level as C-FeCl 3 . Thus, thanks to recycling, waste scale can be used as an alternative to commercial products for green production.
(© 2024. The Author(s).)
Databáze: MEDLINE
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