Chromium removal from tannery wastewaters with a strong cation exchange resin and species analysis of chromium by MINEQL+

Abstract

Chromium (III) salts are highly applied for tanning purpose in tannery industries. The purpose of this study was removal and recovery of chromium(III) from tannery wastewater with a strong cation exchange resin. For this purpose, Amberlite 252 ZU was chosen as a strong cation exchange resin. In the first part of this study, The MINEQL+ computer program was applied depending on the optimum concentration and pH for determining Cr species in aqueous solutions. The second part of the work consists of measuring the exchange equilibrium of H+ ions and Cr(III) ions. Therefore, solutions containing fixed amounts of chromium were brought into contact with different amounts of resins. The evaluation of the obtained equilibrium parameters was done by surface complexing theory. Retention and regeneration steps were successfully performed in the column without any significant change up to 10 cycles. Efficiency was between 90 and 98% in removal studies, and between 81 and 92% in recovery studies. The results showed that a strong cation exchange resin Amberlite 252 ZU can be successfully used for chromium removal and recovery.

Selective Isolation and Identification of Microorganisms with Dual Capabilities: Leather Biodegradation and Heavy Metal Resistance for Industrial Applications

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Investigation of kinetic, isotherm and adsorption efficacy of thorium by orange peel immobilized on calcium alginate

“…There are various common methods for treating wastewater containing heavy metal ions, including thorium, which include chemical precipitation 9 , 10 , oxidation or reduction 11 , 12 , membrane technologies 13 , 14 , filtration, flotation 15 , 16 , electrochemical treatment 17 – 19 , reverse osmose 20 , and solvent extraction 21 – 26 , ion exchange 27 – 29 . Most of these methods involve high capital costs or are only suitable for separating high concentrations of heavy metals.…”

High-efficiency adsorption of Cd2+ and Cr3+ by sodium vanadate nanowire arrays

“…With the rapid economic developments, the ecological environment we live in is gradually being destroyed, and heavy metal pollution in water from metallurgy, mining, and other industries has aroused wide concern all over the world (Bensalah et al, 2023;Jebli et al, 2023;Lebkiri et al, 2023). Cadmium (Cd 2+ ) and chromium (Cr 3+ ) are common toxic heavy metals and have been identified as harmful to the human body (Elfeghe et al, 2022;Kocaoba et al, 2022). Studies have shown that small amounts of chromium and cadmium can have a significant toxic effect on humans (El Gaayda et al, 2023).…”