Contaminants Removal from Wastewater of LFP Batteries Recycling Process Using Adsorption Methods

Wastewater from the LFP battery cathode recycling process still contains metals such as lithium, calcium, sodium, and silica. Adsorption method was used to remove metal ions in the artificial waste of LFP batteries. This experiment was carried out by adding 2, 4, 6, 8, and 10 g of activated carbon, respectively, into 100 mL of an artificial waste solution then put into water-bath shaker at room temperature. For kinetic data, the filtrate was taken every 1 hour, while for equilibrium data the filtrate was taken every 24 hours. The concentrations of the initial solution and the filtrate were analyzed by ICP-OES. The experimental results showed the maximum percentage removal of lithium, calcium, sodium, and silica was at a dose of 100 g L-1 of activated carbon, which were 99.90%, 97.51%, 86.10%, and 79.08%, respectively. It was found that the Freundlich equilibrium model was more suitable for the adsorption isotherm indicated by the correlation coefficients value for lithium, calcium, sodium, and silicon were 0.9869, 0.8850, 0.8974, and 0.9576, respectively. This adsorption followed the Pseudo second order kinetic model derived from correlation coefficient values of chemical kinetic studies.