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Copper extraction from coarsely ground printed circuit boards using moderate thermophilic bacteria in a rotating-drum reactor

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Fig. 1. Schema of the rotating-drum reactor (all dimensions in mm).
Fig. 2. Influence of solid density (a and b) and Fe 2+ concentration (c and d) on redox potential during shake flask leaching of ground PCB
Fig. 3. Effect from initial Fe 2+ concentration and temperature (30 ° C (a) and 50 ° C (b)) on copper extraction from ground PCB
Fig. 4. SEM micrographs of a cross sectional area of PCB fragments showing 4 copper layers (a), lacquer covering the entire section (b), view after lacquer coating removal (c);
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