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Enhanced Removal of Hydrophobic Short-Chain n-Alkanes from Gas Streams in Biotrickling Filters in Presence of Surfactant
Environmental Science & Technology ( IF 11.4 ) Pub Date : 2022-06-24 , DOI: 10.1021/acs.est.2c02022
Xin Wu 1, 2 , Yan Lin 1, 2 , Yongyi Wang 3 , Shaohua Wu 2, 4 , Xiang Li 1, 2 , Chunping Yang 1, 2, 4
Affiliation  

Emissions of n-alkanes are facing increasingly stringent management challenges. Biotrickling filtration in the presence of surfactants is a competitive alternative for the enhanced removal of n-alkanes. Herein, sodium dodecyl benzene sulfonate (SDBS) was added into the liquid phase feeding a biotrickling filter (BTF) to enhance the removal of various short-chain n-alkanes from n-hexane (C6) to methane (C1). The removal performance of C6–C1 and microbial response mechanisms were explored. The results showed that the removal efficiency (RE) of n-alkanes decreased from 77 ± 1.3 to 35 ± 5.6% as the carbon chain number of n-alkanes decreased from C6 to C1, under the conditions of an n-alkane inlet load of 58 ± 3.0 g/m3·h and EBCT of 30 s. The removal performance of n-alkanes was enhanced significantly by the introduction of 15 mg/L SDBS, as the RE of C6 reached 99 ± 0.7% and the RE of C1 reached 74 ± 3.3%. The strengthening mechanisms were that the apparent Henry’s law coefficient of n-alkanes decreased by 11 ± 1.4–30 ± 0.3%, and the cell surface hydrophobicity of microorganisms improved from 71 ± 5.6 to 87 ± 4.0% with the existence of SDBS. Moreover, the presence of SDBS promoted the succession and activity of the microbial community. The activities of alkane hydroxylase and alcohol dehydrogenase were 5.8 and 5.9 times higher than those without SDBS, and the concentration of the cytochrome P450 gene was improved 2.2 times. Therefore, the addition of SDBS is an effective strategy that makes BTF suitable for the removal of various n-alkanes from waste gas streams.

中文翻译:

在存在表面活性剂的情况下,在生物滴滤过滤器中加强从气流中去除疏水性短链正构烷烃

正构烷烃的排放面临越来越严格的管理挑战。在表面活性剂存在下的生物滴滤过滤是增强构烷烃去除率的竞争选择。在此,将十二烷基苯磺酸钠 (SDBS) 添加到液相中,通过生物滴滤器 (BTF) 进料,以增强从正己烷 (C6) 到甲烷 (C1) 的各种短链正烷烃去除探讨了 C6-C1 的去除性能和微生物响应机制。结果表明,当构烷烃的碳链数从 C6 减少到 C1 时,构烷烃的去除效率(RE)从 77±1.3% 下降到 35±5.6% 。构烷烃入口负载为 58 ± 3.0 g/m 3 ·h,EBCT 为 30 s。加入 15 mg/L SDBS 后正构烷烃的去除性能显着提高,C6 的 RE 达到 99 ± 0.7%,C1 的 RE 达到 74 ± 3.3%。强化机制是n的表观亨利定律系数-烷烃降低了11±1.4-30±0.3%,微生物的细胞表面疏水性随着SDBS的存在从71±5.6提高到87±4.0%。此外,SDBS的存在促进了微生物群落的演替和活动。烷烃羟化酶和乙醇脱氢酶的活性分别比不含SDBS的高5.8倍和5.9倍,细胞色素P450基因浓度提高2.2倍。因此,添加 SDBS 是一种有效的策略,使 BTF 适用于从废气流中去除各种正构烷烃。
更新日期:2022-06-24
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