Parameter Screening of Remazol Black Extraction from Liquid Waste Using Emulsion Liquid Membrane

Abstract

The textile industry generates substantial liquid waste, primarily containing stable and toxic dye compounds that persist in aquatic environments, posing severe ecological and health risks. Among these, Remazol Black is a commonly used anionic dye known for its resistance to degradation. This study investigates the use of emulsion liquid membrane (ELM) technology, employing waste cooking oil as a sustainable alternative to petroleum-based diluents, for the extraction of Remazol Black dye from wastewater. The ELM process utilizes Span 80 as a surfactant and Aliquat 336 and D2EHPA as carrier agents, along with NaOH as a stripping agent, to encapsulate and transport dye molecules effectively. Key parameters, including treat ratio, solute concentration, and surfactant concentration, were screened to determine their impact on extraction efficiency. Results indicate that increasing the treat ratio enhances extraction efficiency, reaching up to 96.4% at a 1:2 ratio, while higher solute concentrations further improve dye removal. However, an increase in surfactant concentration beyond 1% reduced efficiency due to emulsion stability issues. This study highlights the potential of ELM technology with waste-derived materials for effective dye removal, providing a foundation for scalable, environmentally friendly wastewater treatment solutions.