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DOI : , Vol.19, No.6, 77 ~ 87, 2011
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| Title |
| Removal of carbon and nitrogen from wastewater by anaerobic-aerobic biofilm process with no addition of external carbon |
| 정수정 Soo Jung Jung , 이용운 Young Woon Lee , 김덕진 Duck Jin Kim , 배상옥 Sang Ok Bae , 강창민 Chang Min Kang |
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| Abstract |
| The combined anaerobic/aerobic(A/O) biofilm reactors filled with different types of media were operated under various conditions for simultaneous removal of carbon and nitrogen in wastewater. In this com bined system, the effect on nitrification was examined under operating conditions with various HRT(hydraulic retention time), influent CODCr and NH4+-N concentration. Effluent from aerobic reactor was recycled internally to anaerobic reactor with the ratio of 1.0 and 1.5. In anaerobic reactor, removal of organic matters in the influent wastewater and denitrification of NO3-N in effluent recycled internally from aerobic reactor was successfully accomplished without any addition of external carbon sources. Removal ratio of CODCr and NO3-N were above 96% and almost 97% in anaerobic reactor. To investigate the optimal operation conditions in aerobic reactor, NH4+-N concentration and HRT varied with 50~200 mg-N/L and 6~24h. Under the operating condition of HRT of 9h, the removal ratio of NH4+-N and CODCr was 96.2% and 81.7%, respectively in aerobic reactor. The removal ratio of NH4+-N was obtained as > 95% regardless of HRT and influent NH4+-N concentration in aerobic reactor. In conclusion, this combined system was well operated with no addition of external carbon source, and the competition between nitrifiers and heterotrophs was not an important factor. |
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| Key Words |
| A/O system, biofilm, Nitrogen removal, Denitrification, Internal recycling |
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