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Environmental Engineering Research 2004;9(3): 113-118. DOI: https://doi.org/10.4491/eer.2004.9.3.113
Won-kwon Lee1, Woo-Keun Bae1, and Daewon Pak2
1Department of Civil and Environmental Engineering, Hanyang University
2Water Environment and Remediation Research Center, Korea Institute of Science and Technology, P.O.Box 131 Cheongryang, Seoul, 130-650, Korea
Corresponding Author: Daewon Pak ,Tel: +82-2-958-5835, Fax: +82-2-958-5839, Email: daewon@kist.re.kr
Received: January 9, 2004;  Accepted: June 7, 2004.
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Pilot plant of two-step biofiltration, a pre-denitrification step followed by a nitrifying step (CN-biofilter), was designed to treat the primary settled municipal wastewater. Performance of the two-step biofiltration was evaluated and compared with the one-step biofiltration (CN-biofilter only). The two-step biofiltration was more effective in removing COD and BOD from municipal wastewater. The pre-denitrification step reduced significantly the organic loading to the following step, CN-biofilter. Therefore, in the CN-biofilter, nitrification rate was enhanced. An important factor affecting the performance of two-step biofiltration is the recirculation ratio. The recirculation ratio determines SCOD/NO3-N in the pre-denitrification step. In order to maximize total nitrogen removal, SCOD/NO3-N ratio has to be maintained at 6.
Keywords: Biofilter | two-step biofiltration | pre-denitrification | municipal wastewater | nitrogen removal
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