Abstract
A packed cage rotating biological contactor (RBC) system was applied to treat wastewater containing Cl 2 residue with concentration even up to 20 mg/L. However, Cl 2 exhibited a negative effect on the efficiency of the system as evidenced by the decrease in the growth of bio-film. It could be concluded that the removal efficiency of the system decreased with the increase of Cl 2 concentration or Cl 2 loading. Due to inhibition of bio-film growth by the effects of Cl 2 residue, the effluent suspended solids (SS) of the system was decreased. The bio-film was easily detached from the media under high growth rate conditions resulting in an increase of effluent SS. The COD and BOD 5 removal efficiencies of the system under the highest organic and Cl 2 loadings of 4.07 g BOD 5/m 2 d and 203.6 mg Cl 2/m 2 d, respectively, were 58.0 ± 3.2% and 60.7 ± 3.9%, respectively, while they were up to 83.3 ± 1.8% and 85.8 ± 2.0%, respectively, under the lowest organic and Cl 2 loading of 2.04 g BOD 5/m 2 d and 25.5 mg Cl 2/m 2 d. However, the effluent SS of the system under above operating conditions was lower than 20 mg/L.
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