Vol. 9, Special Issue 4, Part B (2023)

The current study enumerates the use of supported liquid membrane (SLM) technology to remove and recover the crystal violet dye from wastewaters. The management of textile industry waste effluents is one of the main concerns of environmental health experts due to having excessive concentrations of dyes and resistance to biodegradation. A lab-scale study on the application of supported liquid membranes (SLM) has been conducted for recovery and selective removal of Malachite Green dye from wastewater. Naturally occurring non-toxic vegetable oils have been used as membrane liquids. Polyvinylidene fluoride (PVDF) films have been used as supports for the liquid membrane. Various parameters affecting the dye permeation such as initial dye concentration, pH, stripping acid concentration, oil viscosity and membrane stability have been investigated. In this research liquid-liquid extraction and bulk liquid membrane methods are used to study on the removal and recovery of methylene blue dye from textile wastewater by using salicylic acid in benzene. First, the liquid-liquid extraction of mennyien methylene blue dye was investigated. The parameters examined in this research were the effect of diluents, effect of pH, effect of Extractant concentration, effect of dye concentration and the suitable stripping agent. Second, taking into consideration the obtained results, the transport of methylene blue dye across a bulk liquid membrane was studied. The present work describes the application of Supported Liquid Membrane (SLM) technology towards the removal and recovery of a cationic dye (Methylene Blue) from aqueous solutions. Natural and non-toxic vegetable oils have been impregnated on micro porous polymeric films of polyvinylidene fluoride (PVDF) to constitute a liquid membrane.

The supported liquid membrane technique has proven to be one of the promising methods for the separation and recovery of dyes from wastewater. The cationic dyes MB, MG and anionic dyes EY, TY were tested for removal and more than 89% of the dyes were removed and recovered. The SE/LLE method was used as a preliminary proceeded in determine the appropriate carrier and optimal conditions that were to be applied in BLM and SLM methods in this research work. The BLM technique has been used in compare the effectiveness of SL.M. When comparing BLM with SIM, although BLM removes more dyes than SIM, lots of chemicals required making the less environmentally friendly.

Compared to SK and BLM, SLM has proven to be a very simple, effective and cost effective separation method. Experiments have shown that SLM is a good alternative because of its advantages such as efficient separation, economy and high selectivity to separate the dyes. Also, the use of expensive chemicals in low consumption makes it economical and eco-friendly.