- Thesis topic: Lithium Extraction Using Biodegradable Diluent and Non-biodegradable Diluent from Wastewater

- Doi: https://doi.org/10.6840/cycu202100909

- Abstract: 

        Heavy metals contamination in water systems had a posed global environmental concern because people are more inclined to use technology, the use of heavy metals has increased, along with the effect of limited resources these days. The Supported Liquid Membrane (SLM) method is being widely applied in metal recovery, highly focus on to the combination of the process of extraction and stripping, with high selectivity. By replacing non-bio solution with bio-solution for organic dilution, the method is environmentally friendly and has increased applicability. In addition, extraction systems were measured as a function of various extraction parameters, including pH value of aqueous phase, extraction time, extraction concentration, and composition of the organic phase were investigated. Optimum parameters for solvent extraction by using shaker for mixing the solution via 1 M D2EHPA in Sunflower Oil by O: A = 1: 15 ratio, pH 3 within 20 minutes has reached 89% as the optimum. Lithium concentration will be stripped using 1 M HCl; by A: O = 1: 4 ratio to be prepared. Selected parameter from solvent extraction applied to SLM process of Feed: Extractant: Stripping Agent Ratio is 2:1:1/4. The SLM cycle provided an enriched feed of 6 times higher compare to initial concentration to stripping agent from initial 230 ppm to 1380 ppm within 240 minutes. Moreover, the SLM machine has a recovery efficiency of 75%. This shows that vegetable oils have the ability to dilute organically, and give high processing efficiency, with potential applications in the future.

Keywords: SLM, Lithium, Biodegradable Diluent, Solvent Extraction, Stripping, SLM