College of Architecture and Environment, Sichuan University, Chengdu, 610065, People's Republic of China.
College of Architecture and Environment, Sichuan University, Chengdu, 610065, People's Republic of China; National Engineering Research Center for Flue Gas Desulfurization, Chengdu, 610065, People's Republic of China.
Chemosphere. 2020 Jun;249:126127. doi: 10.1016/j.chemosphere.2020.126127. Epub 2020 Feb 7.
In this study, high concentration of HS (i.e., 5000 ppmv) in biogas was effectively removed by a slightly alkaline biotricking filter (BTF) with Polypropylene rings as packing material and oxygen from air as the electron acceptor. The results showed that when the inlet loading of HS increased from 101.7 to 422.0 g/m/h, the removal efficiency of HS decreased from 100.0% to 91.4%, and the maximum elimination capacity (EC) was 386.0 ± 10.5 gHS/m/h when empty bed retention time (EBRT) was 1.0 min. The slightly alkaline condition could increase the mass transfer of HS from gas to liquid phase and avoid the toxic effect of high concentration of HS, resulting in high removal performance of HS in the system. With the increase of HS inlet loading, the ratio of SO in bio-desulfurization products gradually decreased, while that of S increased. At 101.7-210.7 gHS/m/h of inlet loading, SO was the dominant product with the ratio of above 50.00%, while S became the dominant product with 62.96% at 422.0 gHS/m/h of inlet loading. The 16S rDNA sequencing results showed that the dominant genus in the BTF was sulfide-oxidizing bacteria (SOB), with the abundance of SOB decreased with the increase of inlet loading. The dominant genus were Pseudomonas, Halothiobacillus and Sulfurimonas in the BTF at 101.7, 139.8 and 210.7 gHS/m/h of inlet loading, respectively. The SOB Sulfurimonas might play an important role for bio-desulfurization of high concentration of HS in a slightly alkaline BTF under high inlet loading of HS.
在这项研究中，通过一个略微碱性的生物滴滤器（BTF），使用聚丙烯环作为填充材料，以空气中的氧气作为电子受体，有效地去除沼气中的高浓度 HS（即 5000 ppmv）。结果表明，当入口 HS 负荷从 101.7 增加到 422.0 g/m/h 时，HS 的去除效率从 100.0%下降到 91.4%，最大消除容量（EC）为 386.0±10.5 gHS/m/h，当空床保留时间（EBRT）为 1.0 分钟。略微碱性的条件可以增加 HS 从气相到液相的传质，避免高浓度 HS 的毒性作用，从而使系统对 HS 具有较高的去除性能。随着 HS 入口负荷的增加，生物脱硫产物中 SO 的比例逐渐降低，而 S 的比例增加。在 101.7-210.7 gHS/m/h 的入口负荷下，SO 是主要产物，比例超过 50.00%，而在 422.0 gHS/m/h 的入口负荷下，S 成为主要产物，比例为 62.96%。16S rDNA 测序结果表明，BTF 中的优势属是硫氧化细菌（SOB），随着入口负荷的增加，SOB 的丰度降低。在入口负荷为 101.7、139.8 和 210.7 gHS/m/h 时，BTF 中的优势属分别为假单胞菌属、盐单胞菌属和硫单胞菌属。在高 HS 入口负荷下，略微碱性的 BTF 中硫氧化细菌 Sulfurimonas 可能对高浓度 HS 的生物脱硫起着重要作用。
