A Step by Step Investigation of Cr(III) Recovery from Tannery Waste †
Laboratory of Chemical & Environmental Technology, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
*
Author to whom correspondence should be addressed.
†
Presented at the 4th International Electronic Conference on Water Sciences, 13–29 November 2019;
Available online: https://ecws-4.sciforum.net/.
Proceedings 2020, 48(1), 1; https://doi.org/10.3390/ECWS-4-06436
Published: 12 November 2019
(This article belongs to the Proceedings of The 4th International Electronic Conference on Water Sciences)
The effluent of tanneries is a hazardous waste and a combination of physical-chemical and biological techniques is required for its treatment. As a result of the previous processes, a sludge with high chromium content is produced. So, the aim of this study is the hydrometallurgical recovery of chromium in the context of a circular economy. According to chemical characterization, the only form of metal that existed in the sludge was the trivalent, while its content was up to 14.8% w/w. Among the examined acids, the highest efficiency in Cr(III) leaching was achieved by the H2SO4 (93%), due to the formation of the soluble CrSO4+. Regarding the step of precipitation, no significant varions were observed between the two alkaline medias that were tested, namely NaOH and Ca(OH)2.
Keywords:
tannery sludge; chromium recovery; hydrometallurgy; circular economy
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
MDPI and ACS Style
Kokkinos, E.; Zouboulis, A. A Step by Step Investigation of Cr(III) Recovery from Tannery Waste. Proceedings 2020, 48, 1. https://doi.org/10.3390/ECWS-4-06436
AMA Style
Kokkinos E, Zouboulis A. A Step by Step Investigation of Cr(III) Recovery from Tannery Waste. Proceedings. 2020; 48(1):1. https://doi.org/10.3390/ECWS-4-06436
Chicago/Turabian StyleKokkinos, Evgenios, and Anastasios Zouboulis. 2020. "A Step by Step Investigation of Cr(III) Recovery from Tannery Waste" Proceedings 48, no. 1: 1. https://doi.org/10.3390/ECWS-4-06436
Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.
