Nitrification of low concentration ammonia nitrogen using zeolite biological aerated filter (ZBAF)

• Published in: Environmental engineering research Vol. 25; no. 4; pp. 554 - 560
• Main Authors: Kim, Jin-Su, Lee, Ji-Young, Choi, Seung-Kyu, Zhu, Qian, Lee, Sang-Ill
• Format: Journal Article
• Language: Korean
• Published: 2020
• Subjects: Nitrification; Biological aerated filter; Zeolite; Low concentration; Low temperature
• ISSN: 1226-1025; 2005-968X

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.