Comparative study between liquid–liquid extraction and bulk liquid membrane for the removal and recovery of methylene blue from wastewater

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 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. All the mentioned parameters applied in BLM technique and results are discussed.