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S. 1999. The efficiency of a rotating biological contactor (RBC) in the treatment of waters contaminated with cadmium, copper and zinc, in particular the effect of rotational speed, namely 3, 15 and 25 rev min −1 , on heavy metal reclamation was evaluated. Atomic absorption spectrophotometric analysis indicated × 92% and ³ 20% removal of copper (Cu 2+ ) and zinc (Zn 2+ ), respectively. Cadmium (Cd 2+ ) levels, however, remained constant. Similar results were obtained at all three rotation speeds tested.

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