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Environmental Engineering Research 2019;24(2): 238-245. DOI: https://doi.org/10.4491/eer.2017.181
An aerobic granular sludge process for treating low carbon/nitrogen ratio sewage
JaeBin Yae1, JaeHoon Ryu1, Nguyen Van Tuyen1, HyunGu Kim2, SeongWan Hong1,2, and DaeHee Ahn1,2 
1Department of Environmental Engineering and Energy, Myongji University, Yongin 17058, Republic of Korea
2BlueBank Co., Ltd., Business Incubator Center, Myongji University, Yongin 17058, Republic of Korea
Corresponding Author: DaeHee Ahn ,Tel: +82-31-321-5901, Fax: +82-505-300-5901, Email: dhahn@mju.ac.kr
Received: November 19, 2017;  Accepted: July 26, 2018.
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This study investigated the characteristic of aerobic granular sludge (AGS) process to treat the sewage having low carbon/nitrogen ratio (Biochemical oxygen demand (BOD5):Total nitrogen (T-N), 4.5:1) in sequencing batch reactor (SBR). The removal efficiency of BOD5, suspended solid (SS), T-N and phosphorus (PO43--P) were 92.6%, 64.3% and 90.1%. Concentration and size of AGS were changed in proportion to the organic matters and nitrogen concentration of the influent (Concentration and size of AGS: 1,700-3,000 mg/L, 0.5-1.0 mm). Mixed liquor suspended solid (MLSS) also changed with the concentration of AGS (MLSS: 2,000-3,500 mg/L). When the settling time was shortened from 15 min to 10 min, size and shape of AGS were maintained (Size of AGS: 1.0-1.5 mm). In addition, the concentration of AGS and MLSS increased (Concentration of AGS: 3,500 mg/L, MLSS: 4,000 mg/L). Concentration, size and shape of AGS were affected the settling time of the reactor more than the concentration of organic matter and nitrogen in the influent. In the results of removal efficiency and changes in AGS, we confirmed that the SBR process using AGS can be used to treat the sewage having low carbon/nitrogen ratio by applying short settling time.
Keywords: Aerobic granular sludge (AGS) | Low carbon/nitrogen ratio | Sequencing batch reactor (SBR) | Sewage
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