Multi-objective optimization of heavy metals bioleaching from discarded mobile phone PCBs: Simultaneous Cu and Ni recovery using Acidithiobacillus ferrooxidans

摘要: Abstract The present study examined bioleaching of heavy metals from mobile phone printed circuit boards (MPPCBs) using adapted Acidithiobacillus ferrooxidans . adaptation phase (10% v/v inoculum) began with 1 g PCB powder per 1L culture medium and continued for 55 days to a level 20 g medium. factors that metal were initial pH, Fe 3+ concentration, pulp density particle size. To maximize simultaneous extraction Cu Ni MPPCBs, these optimized under multi-objective optimization strategy the central composite design response surface methodology. Two modified quadratic models selected predict interactions behavior influence parameters on e-waste samples. An pH 1, concentration 4.18 g/l, 8.5 g/l size 114.02 μm (#100 mesh) determined as optimal conditions. Under conditions, 100% was achieved. Eh, bacterial count, varied over time measured