Interactions and microbial variations in a biotrickling filter treating low concentrations of hydrogen sulfide and ammonia
Interactions and microbial variations in a biotrickling filter treating low concentrations of hydrogen sulfide and ammonia
复制标题
处理低浓度硫化氢和氨的生物滴滤器中的相互作用和微生物变化
DOI：
10.1016/j.chemosphere.2020.126931
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发表时间：
2020
期刊：
影响因子：
8.8
通讯作者：
Liu Dezhao
中科院分区：
文献类型：
--
作者：
Ying Shihao;Kong Xianwang;Cai Zhen;Man Zun;Xin Yicong;Liu Dezhao
实验室规模的生物滴滤器（BTF）填充有陶瓷拉西环和陶粒，用于共处理低浓度的硫化氢（H2S）和氨（NH3），作为通常在例如，集约化畜牧生产设施。本研究以出口气体中H2S和NH3的浓度为指标，考察处理后气体是否达到无臭条件。总体而言，在第I阶段（仅H2S）和第II阶段（H2S和NH3）期间，BTF中的H2S和NH3都获得了优异的去除效率。具体地，当H2S和NH3的入口浓度分别为约1.8 ppmv和35.3 ppmv时，H2S出口浓度低于检测限（约3.6 ppbv），并且NH3出口浓度小于0.4 ppmv。在这种情况下，运行空床停留时间为10.2秒。在第二阶段，当入口NH3浓度增加时，出口H2S浓度显著降低，这可能是由于pH值的影响。同时，在实验过程中，出口N2O浓度保持较低（<2%NH3），表明BTF的正常运行。当进口气体由第一阶段的H2S转变为第二阶段的H2S和NH3时，BTF中的主要硫氧化细菌（Sulfur）物种由酸性硫杆菌（Acidithiobacillus）转变为硫杆菌（Thiobacillus）。
A lab-scale biotrickling filter (BTF) packed with porcelain Rasching ring and ceramsite was applied for co-treating of low concentrations of hydrogen sulfide (H2S) and ammonia (NH3), as major pollutants typically found in e.g., intensive livestock production facilities. In this study, the outlet gas concentrations of H2S and NH3were used for indicators if the treated gas reached odor-free condition. Overall, excellent removal efficiencies were obtained for both H2S and NH3in the BTF during Stage I (H2S alone) and Stage II (H2S and NH3). Specifically, the H2S outlet concentration was below the detection limit (∼3.6 ppbv) and the NH3outlet concentration was less than 0.4 ppmv when the inlet concentrations of H2S and NH3were 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 H2S concentration was decreased significantly when the inlet NH3concentration was increased, likely due to the influence by pH. Meanwhile, the outlet nitrous oxide (N2O) concentration was kept low (<2% NH3) during the experiment, suggesting a proper operation of the BTF. After the inlet gas shifted from H2S alone at Stage I to H2S and NH3at Stage II, the main sulfur-oxidizing bacteria (SOB) species in the BTF switched fromAcidithiobacillustoThiobacillus.