Abstract
The treatment of combined sewer overflow (CSO) is one of potential concerns in domestic wastewater treatment in Korea due to the pre-announce of CSO regulations. This work investigated the effects of disinfectant (NaOCl) concentration (0.11 to 4.0 mg Cl2/L), pH (6.5 to 8.0), temperature (15 to 25°C), ammonia (10 to 41 mg N/L), and suspended solids (91 to 271 mg SS/L) on the chlorine disinfection of CSO. The effect of NaOCl concentration on the pseudo-1 order reaction rate for total coliform inactivation was described well with a saturation-type model with the half-velocity constant of 1.212 mg/L. The total coliform inactivation reaction rate decreased with SS and pH, and increased with temperature. Ammonia in the examined range did not affect the disinfection kinetics. A chlorine contact tank with the injection chlorine level of 1 mg Cl2/L and the hydraulic retention time of 1.25 min is estimated to reduce total coliform from 1 × 10 MPN/mL to 1,000 MPN/mL at 271 mg SS/L, 15°C, and pH 8.0. Chlorine would be a proper option for the disinfection of CSO.
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