LAPSE:2021.0083
Published Article
LAPSE:2021.0083
Scale-Up of Self-Regenerating Semi-Batch Adsorption Cycles through Concurrent Adsorption and Reduction of Cr(VI) on Sheep Wool
Mohamed Badrelzaman, Mustafa I. Khamis, Taleb H. Ibrahim, Fawwaz H. Jumean
March 1, 2021
A previous publication by our group reported that adsorption of Cr(VI) on sheep wool reached 99% when allowed a long residence time, with concurrent reduction to Cr(III). In this study, the process was scaled up by optimizing a pilot plant based on semi-batch adsorption cycles. This yielded Cr(III), which is about 300 times less toxic than Cr(VI), and can be precipitated using lime at high pH. Since the reduction step is slower than the adsorption one, an adsorption column was designed to perform semi-batch operation cycles, whereby the extended “off cycle” allows reduction to take place. Since reduction of Cr(VI) frees active sites on wool, the plant acts in lieu of in situ regeneration, accompanied by additional adsorption of Cr(VI). The results show that 97% of the column efficiency can be recovered within 24 h of “off cycle”. Wastewater from a local electroplating industry was treated by this method with high removal of Cr(VI), reaching the limit permitted by environmental standards. This study also reveals that typical concentrations of heavy metals, present in wastewater produced from electroplating, had no substantial antagonistic interference with Cr(VI) adsorption.
Keywords
Adsorption, hexavalent chromium, industrial wastewater, semi-batch adsorption cycles, wool
Suggested Citation
Badrelzaman M, Khamis MI, Ibrahim TH, Jumean FH. Scale-Up of Self-Regenerating Semi-Batch Adsorption Cycles through Concurrent Adsorption and Reduction of Cr(VI) on Sheep Wool. (2021). LAPSE:2021.0083
Author Affiliations
Badrelzaman M: Department of Chemical Engineering, American University of Sharjah, Sharjah 26666, UAE [ORCID]
Khamis MI: Department of Biology, Chemistry and Environmental Sciences, American University of Sharjah, Sharjah 26666, UAE
Ibrahim TH: Department of Chemical Engineering, American University of Sharjah, Sharjah 26666, UAE
Jumean FH: Department of Biology, Chemistry and Environmental Sciences, American University of Sharjah, Sharjah 26666, UAE
Journal Name
Processes
Volume
8
Issue
9
Article Number
E1092
Year
2020
Publication Date
2020-09-02
Published Version
ISSN
2227-9717
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Original Submission
Other Meta
PII: pr8091092, Publication Type: Journal Article
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LAPSE:2021.0083
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doi:10.3390/pr8091092
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Mar 1, 2021
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Mar 1, 2021
 
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Mar 1, 2021
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Calvin Tsay
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