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Environmental Engineering Research 2009;14(4): 238-242. DOI: https://doi.org/10.4491/eer.2009.14.4.238
Effects of Organic Loading Rates on Treatment Performance in a Polyvinylidene Media Based Fixed-Film Bioreactor
Zubair Ahmed1, Sang-Eun Oh2, and In S. Kim3
1Department of Environmental Engineering, Faculty of Civil Engineering, University Teknologi Malaysia
2Department of Biological Environment, Kangwon National University, Hyoja 2-dong, Chunchon-si, Gangwon-do 200-701, Korea
3Department of Environmental Science & Engineering, Gwangju Institute of Science and Technology, Oryong-dong Buk-gu, Gwangju 500-712, Korea
Corresponding Author: Sang-Eun Oh ,Tel: +82-33-250-6449, Fax: +82-33-241-6640, Email: ohsangeun@kangwon.ac.kr
Received: June 13, 2009;  Accepted: November 14, 2009.
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This study investigated the effects of organic loading rates on simultaneous carbon and nitrogen removal in an innovative fixed-film aerobic bioreactor. The fixed-film bioreactor (FFB) was composed of a two-compartment aeration tank, in which a synthetic filamentous carrier was submerged as biofilm support media, and a settling tank which polyvinylidene media (Saran) was used as settling aid for suspended solids. Three different organic loading rates, ranging from 0.92–2.02 kg chemical oxygen demand/m3/day were applied by varying hydraulic retention time (HRT). The total soluble organic carbon removal efficiencies were in the range of 90–97%. The removal efficiency of ammonia was found to be in the range of 70–84%. Total nitrogen removal efficiency was found to be in the range of 40–45%, which indicates that denitrification reactions occurred simultaneously in the attached biofilm on the fibrous media in the aeration tank. The settling performance of suspended solids was significantly improved due to the presence of Saran media in the settling compartment, even for a short HRT. The fixed-film aerobic bioreactor used in this study demonstrated efficient treatment efficiency even at higher organic loading rates and at short HRTs.
Keywords: Organic loading rate | Denitrification | Saran media | Fixed-film bioreactor | Settling behaviour
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