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KMID : 0382420000260040009
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Korean Journal of Environmental Health Society
2000 Volume.26 No. 4 p.9 ~ p.14
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Application of A2 / O Process for Removal of Nitrogen and Phosphorus in Sewage
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Ahn Chul-Woo
Park Jin-Sick
Moon Choo-Yeun
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Abstract
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In this study, the removal efficiencies of organics, nitrogens and phosphorus from municipal wastewater using A^2/O process were investigated. BOD_5 removal efficiencies were indicated 95% and 94% with HRT of 12 hr and 10 hr, respectively. COD_Cr average removal efficiency and concentration of effluent were indicated 87% and 34 mg/ℓ. SS average removal efficiency and concentration range of effluent were indicated 93% and 4~17 mg/ℓ. T-N removal efficiency and concentration of effluent were shown as 60~80% and below 15 mg/ℓ. In aerobic basin, removal efficiency of NH_4-N was shown over 97% with NH_4-N volume load 0.16 kg NH_4-N /㎥·d and in anoxic basin, denitrification efficiency was indicated over 80% with return sludge rate 0.5 Q and internal recirculation rate 2.5 Q. Removal efficiency and effluent concentration of phosphorus were shown over 80% and below 2 mg/ℓ with return sludge rate 0.5 Q.
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