Abstract
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 < 20% removal of copper (Cu2+) and zinc (Zn2+), respectively. Cadmium (Cd2+) levels, however, remained constant. Similar results were obtained at all three rotation speeds tested.
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