In this study, the removal efficiencies of organics, nitrogens and phosphorus from municipal wastewater using A2/O process were investigated. BO D5 removal efficiencies were indicated 95% and 94% with HRT of 12 hr and 10 hr, respectively. CO DCr average removal efficiency and concentration of effluent were indicated 87% and 34mg/ℓ. SS average removal efficiency and concentration of effluent were indicated 93% and 4~17mg/ℓ. T-N removal efficiency and concentration of effluent were shown as 60~80% and below 15mg/ℓ. In aerobic basin, removal efficiency of NH4-N was shown over 97% with NH4-N volume load 0.16kg NH4-N/㎥.d and in anoxic basin, denitrification efficiency was indicated over 80% with return sludge rate 0.5Q and internal recirculation rate 2.5Q. Removal efficiency and effluent concentration of phosphorus were shown over 80% and below 2 mg/ℓ with return sludge rate 0.5Q.Q.
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