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

Abstract

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. © 2021 Water Environment Federation • 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 Cr 2 O 7 2− 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.

Pengaruh Surfaktan terhadap Pemisahan Logam Transisi Periode Pertama Menggunakan Metode Emulsion Liquid Membrane

“…Beberapa peneliti telah melakukan pemisahan logam transisi periode pertama menggunakan surfaktan Span 80 dan menghasilkan emulsi yang stabil seperti dalam pemisahan dan recovery V(IV) dari larutan asam pelindian pengotor batu bara dengan efisiensi ekstraksi sebesar 87,5% [37]. Selanjutnya penelitian untuk pemisahan Cr(VI) dengan efisiensi ekstraksi sebesar 100% [38] dan penelitian untuk pemisahan Co(II) dari larutan klorida dengan efisiensi ekstraksi sebesar 99% [12]. Kemudian ekstraksi Ni(II) dengan efisiensi ekstraksi sebesar 99% [39] serta peneltian untuk pemisahan Zn(II) dari limbah electroplating dengan efisiensi ekstraksi sebesar 97,4% [40].…”

Emulsion Liquid Membrane Modelling for Cadmium Removal using Taylor-Couette Column

“…Teramoto et al, [12] developed a model by taking into account external phase mass transfer and membrane breakage phenomenon. In the research of Othman et al, [13], the extraction and stripping reaction of chromium and carrier was considered. Liu and Liu [14] expanded the model by investigating the fractional resistances of external phase diffusion as well as emulsion globule diffusion towards the overall process.…”

Vegetable Oil–Ionic Liquid-Based Emulsion Liquid Membrane for the Removal of Lactic Acid from Aqueous Streams: Emulsion Size, Membrane Breakage, and Stability Study

“… 18 Therefore, ELM stability can be improved by adding an external agent termed “carrier”. 19 Conventional carriers employ organic solvents, including di(2-ethylhexyl) phosphoric acid (D 2 EHPA), 20 trioctylamine (TOA), 21 and so forth. To overcome the well-known problems associated with organic solvents such as toxicity, non-biodegradability, and environmental pollution, ionic liquids (ILs) are increasingly being employed as environmentally friendly, or greener, alternatives.…”

“…ELM instability can also occur when the water molecules enter emulsion, causing it to swell, which decline the extraction efficiency . Therefore, ELM stability can be improved by adding an external agent termed “carrier” . Conventional carriers employ organic solvents, including di­(2-ethylhexyl) phosphoric acid (D 2 EHPA), trioctylamine (TOA), and so forth.…”