Institute of Agricultural Bio-Environmental Engineering, College of Biosystems Engineering and Food Science, Zhejiang University, China.
Institute of Agricultural Bio-Environmental Engineering, College of Biosystems Engineering and Food Science, Zhejiang University, China.
Chemosphere. 2020 Sep;255:126931. doi: 10.1016/j.chemosphere.2020.126931. Epub 2020 May 3.
A lab-scale biotrickling filter (BTF) packed with porcelain Rasching ring and ceramsite was applied for co-treating of low concentrations of hydrogen sulfide (HS) and ammonia (NH), as major pollutants typically found in e.g., intensive livestock production facilities. In this study, the outlet gas concentrations of HS and NH were used for indicators if the treated gas reached odor-free condition. Overall, excellent removal efficiencies were obtained for both HS and NH in the BTF during Stage I (HS alone) and Stage II (HS and NH). Specifically, the HS outlet concentration was below the detection limit (∼3.6 ppbv) and the NH outlet concentration was less than 0.4 ppmv when the inlet concentrations of HS and NH were around 1.8 ppmv and 35.3 ppmv, respectively. In this case, the running empty bed residence time was 10.2 s. During Stage II, the outlet HS concentration was decreased significantly when the inlet NH concentration was increased, likely due to the influence by pH. Meanwhile, the outlet nitrous oxide (NO) concentration was kept low (<2% NH) during the experiment, suggesting a proper operation of the BTF. After the inlet gas shifted from HS alone at Stage I to HS and NH at Stage II, the main sulfur-oxidizing bacteria (SOB) species in the BTF switched from Acidithiobacillus to Thiobacillus.
采用实验室规模的生物滴滤塔（BTF），填充瓷拉西环和陶粒，用于协同处理低浓度的硫化氢（HS）和氨（NH），这两种污染物通常存在于集约化养殖设施中。在这项研究中，出口气体中的 HS 和 NH 浓度被用作处理气体是否达到无臭条件的指标。总的来说，在 BTF 中，在第一阶段（仅 HS）和第二阶段（HS 和 NH），对 HS 和 NH 都获得了优异的去除效率。具体而言，当入口 HS 和 NH 浓度分别约为 1.8 ppmv 和 35.3 ppmv 时，HS 的出口浓度低于检测限（∼3.6 ppbv），NH 的出口浓度小于 0.4 ppmv。在这种情况下，空床停留时间为 10.2 s。在第二阶段，当入口 NH 浓度增加时，出口 HS 浓度显著降低，可能是由于 pH 的影响。同时，在实验过程中，出口氧化亚氮（NO）浓度保持在低水平（<2% NH），表明 BTF 运行良好。当入口气体从第一阶段的仅 HS 切换到第二阶段的 HS 和 NH 时，BTF 中的主要硫氧化细菌（SOB）物种从嗜酸硫杆菌切换到硫杆菌。
