Emulsion liquid membrane modeling for chromium removal from electroplating wastewater using TOMAC as a carrier

Hexavalent chromium, emanating primarily from the electroplating industries, can be reduced to the less toxic trivalent variety by several methods, including emulsion liquid membrane (ELM). In this work, studies on the continuous removal of chromium from authentic electroplating wastewater by ELM ar...

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Bibliographic Details
Published in:Water environment research 2021-09, Vol.93 (9), p.1669-1679
Main Authors: Othman, Norasikin, Noah, Norul Fatiha Mohamed, Sulaiman, Raja Norimie Raja, Jusoh, Norela, Tan, Wan Ting
Format: Article
Language:English
Subjects:
Accuracy
Chromium
Electroplating
electroplating wastewater
Emission
emulsion liquid membrane
Emulsions
extractant
Feeds
Hexavalent chromium
Industrial wastewater
Industry
Liquid membranes
Plating
prediction model
Removal
Simulation
Wastewater
Wastewater treatment
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Summary:Hexavalent chromium, emanating primarily from the electroplating industries, can be reduced to the less toxic trivalent variety by several methods, including emulsion liquid membrane (ELM). In this work, studies on the continuous removal of chromium from authentic electroplating wastewater by ELM are reported. The effects of treat ratio, external feed phase, and stripping agent concentration were examined. A mathematical boundary breakage model was used to study the extraction efficiency of chromium through the ELM process. The model representing the prediction of ELM extraction performance for chromium was validated through the comparison between the simulation and experimental results. The result showed the simulation model is found to be in good agreement with the experimental result. Almost 100% of 40 ppm chromium in the external feed phase was extracted within 3 to 5 min using 0.022 M TOMAC as extractant, 1.0 M acidic thiourea in the internal phase, and 1 to 5 of treat ratio. Practitioner Points Hexavalent chromium, emanating primarily from electroplating industries, can be reduced to the less toxic trivalent using ELM process. The developed method was tested for its applicability with predominant species of Cr2O72− in real rinse electroplating wastewater. The extraction efficiency (%) of Cr (VI) was almost 100% for 40 ppm Cr in the external feed phase within 3 to 5 min. The result showed the simulation model is found to be in good agreement with the experimental result. A schematic diagram of mixer‐settler extraction using in emulsion liquid membrane.
ISSN:1061-4303
1554-7531
DOI:10.1002/wer.1551