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DOI: https://doi.org/10.4491/eer.2019.115
Nitrification of low concentration ammonia nitrogen using zeolite biological aerated filter (ZBAF)
Jin-Su Kim, Ji-Young Lee, Seung-Kyu Choi, Qian Zhu, and Sang-Ill Lee
Department of Environmental Engineering, Chungbuk National University, Cheongju, Republic of Korea
Corresponding Author: Sang-Ill Lee ,Tel: 82-43-261-2469, Email: gatorlee@chungbuk.ac.kr
Received: March 20, 2019;  Accepted: August 7, 2019.
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ABSTRACT
This study focuses on nitrification through a biological aerated filter (BAF) that is filled with a zeolite medium at low concentrations of ammonia. The zeolite medium consists of natural zeolite powder. The BAF is operated under two types of media, which are a ball-type zeolite medium and expanded poly propylene (EPP) medium. Nitrification occurred in the zeolite BAF (ZBAF) when the influent concentration of ammonia nitrogen was 3 mg L-1, but the BAF that was filled with an EPP medium did not experience nitrification. The ammonia nitrogen removal efficiency of ZBAF was 63.38% and the average nitrate nitrogen concentration was 1.746 mg/L. The ZBAF was tested again after a comparison experiment to treat pond water, and municipal wastewater mixed pond water. The ZBAF showed remarkable ammonia-nitrogen treatment at low concentration and low temperature. During this period, the average ammonia nitrogen removal efficiency was 64.56%. Especially, when water temperature decreased to 4.7℃, ammonia nitrogen removal efficiency remained 79%. On the other hand, the chemical-oxygen demand (COD) and phosphorus-removal trends were different. The COD and phosphorus did not show as efficient treatment as the ammonia-nitrogen treatment.
Keywords: Biological aerated filter; Low concentration; Low temperature | Nitrification | Zeolite
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