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Environmental Engineering Research 2019;24(3): 376-381. DOI: https://doi.org/10.4491/eer.2018.083
A shell layer entrapping aerobic ammonia-oxidizing bacteria for autotrophic single-stage nitrogen removal
Hyokwan Bae1, and Minkyu Choi2
1Department of Civil and Environmental Engineering, Pusan National University, Busan 46241, Republic of Korea
2Center for Water Resource Cycle Research, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
Corresponding Author: Hyokwan Bae ,Tel: +82-51-510-2392, Fax: +82-51-514-9574, Email: hyokwan.bae@pusan.ac.kr
Received: March 1, 2018;  Accepted: September 3, 2018.
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In this study, a poly(vinyl) alcohol/sodium alginate (PVA/SA) mixture was used to fabricate core-shell structured gel beads for autotrophic single-stage nitrogen removal (ASNR) using aerobic and anaerobic ammonia-oxidizing bacteria (AAOB and AnAOB, respectively). For stable ASNR process, the mechanical strength and oxygen penetration depth of the shell layer entrapping the AAOB are critical properties. The shell layer was constructed by an interfacial gelling reaction yielding thickness in the range of 2.01-3.63 mm, and a high PVA concentration of 12.5% resulted in the best mechanical strength of the shell layer. It was found that oxygen penetrated the shell layer at different depths depending on the PVA concentration, oxygen concentration in the bulk phase, and free ammonia concentration. The oxygen penetration depth was around 1,000 μm when 8.0 mg/L dissolved oxygen was supplied from the bulk phase. This study reveals that the shell layer effectively protects the AnAOB from oxygen inhibition under the aerobic conditions because of the respiratory activity of the AAOB.
Keywords: Autotrophic single-stage nitrogen removal | Core-shell structured gel bead | Free ammonia | Mechanical strength | Oxygen penetration depth | Poly(vinyl) alcohol/sodium alginate
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