Sorial G A, Smith F L, Suidan M T, Brenner R C
Department of Civil and Environmental Engineering, University of Cincinnati, Cincinnati, Ohio, USA.
J Air Waste Manag Assoc. 2001 May;51(5):756-65. doi: 10.1080/10473289.2001.10464307.
A trickle bed air biofilter (TBAB) was evaluated for the oxidation of NH3 from an airstream. Six-millimeter Celite pellets (R-635) were used for the biological attachment medium. The efficiency of the biofilter in oxidizing NH3 was evaluated using NH3 loading rates as high as 48 mol NH3/m3 hr and empty-bed residence times (EBRTs) as low as 1 min. Excess biomass was controlled through periodic backwashing of the biofilter with water at a rate sufficient to fluidize the medium. The main goal was to demonstrate that high removal efficiencies could be sustained over long periods of operation. Ammonia oxidation efficiencies in excess of 99% were consistently achieved when the pH of the liquid nutrient feed was maintained at 8.5. Quick recovery of the biofilter after backwashing was observed after only 20 min. Evaluation of biofilter performance with depth revealed that NH3 did not persist in the gas phase beyond 0.3 m into the depth of the medium (26% of total medium depth).
评估了滴流床空气生物滤池（TBAB）对气流中氨的氧化作用。使用6毫米的硅藻土颗粒（R-635）作为生物附着介质。生物滤池氧化氨的效率通过高达48摩尔氨/立方米·小时的氨负荷率和低至1分钟的空床停留时间（EBRT）来评估。通过以足以使介质流化的速率用水对生物滤池进行定期反冲洗来控制过量的生物量。主要目标是证明在长时间运行中可以维持高去除效率。当液体营养进料的pH值保持在8.5时，氨氧化效率始终超过99%。仅20分钟后就观察到反冲洗后生物滤池的快速恢复。对生物滤池性能随深度的评估表明，在介质深度0.3米以内（占总介质深度的26%），氨在气相中不会持续存在。
