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Enhanced interfacial microbial degradation of n-hexane-contaminated waste gas using a novel magnetic silicone oil.

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Title: Enhanced interfacial microbial degradation of n-hexane-contaminated waste gas using a novel magnetic silicone oil.
Authors: Ou, Guangquan1 (AUTHOR), Ran, Fangzhen1 (AUTHOR), Shang, Zhengwei2 (AUTHOR), Meng, Chenhang1 (AUTHOR), Liu, Jiahao1 (AUTHOR), Sun, Zhuqiu3 (AUTHOR), Chen, Dongzhi1 (AUTHOR) cdz@zjut.edu.cn, Lin, Rongsheng1,4 (AUTHOR) linrongsheng@xjjurong.com, Lu, Lichao1 (AUTHOR) lu_lc21@zjou.edu.cn
Source: Journal of Biotechnology. Jan2026, Vol. 409, p14-21. 8p.
Subjects: Hexane, Volatile organic compounds, Mass transfer, Silicones, Biodegradation, Microbial growth, Bioreactors, Mycobacterium
Abstract: Two-phase partitioning bioreactors have addressed the challenges of treating waste gases contaminated with hydrophobic volatile organic compounds (VOCs), primarily by improving mass transfer. However, the efficient recovery of the non-aqueous phase remains a significant issue. In this study, a novel magnetic silicone oil, designated KH602, was developed as a non-aqueous phase medium in a two-phase partitioning air-lift bioreactor for the treatment of gaseous n -hexane. KH602 improved the oil/water partition coefficient by 1.402-fold compared to conventional silicone oil. When used in the bioreactor, KH602 increased the elimination capacity by 33.3 % at an inlet concentration of 500 mg·m−3. KH602 also promoted microbial extracellular polymer secretion, with protein content increasing by 25 %. It stimulated a higher proportion of activated cells and enhanced their capacity to utilize n -hexane metabolic intermediates, particularly esters, which showed a 117.9 % increase. Biomass was enriched at the oil–water interface, facilitating the mass transfer of n -hexane via a "gas–oil–biological" pathway. Additionally, microbial genera with known or potential n -hexane degradation capabilities, including Mycobacterium and Gordonia , were enriched. These findings offer theoretical insights and technical support for the efficient treatment of hydrophobic VOCs. [Display omitted] • KH602 increased the oil/water partition coefficient of nH by 40.16 %. • Elimination capacities were improved by 33.3 % in KH602. • Protein contents were increased by 25 % in KH602. • The ability of microorganisms to utilize esters increased by 117.9 % in KH602. • KH602 allowed more n -hexane-degrading bacteria to adhere to the oil–water interface. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Two-phase partitioning bioreactors have addressed the challenges of treating waste gases contaminated with hydrophobic volatile organic compounds (VOCs), primarily by improving mass transfer. However, the efficient recovery of the non-aqueous phase remains a significant issue. In this study, a novel magnetic silicone oil, designated KH602, was developed as a non-aqueous phase medium in a two-phase partitioning air-lift bioreactor for the treatment of gaseous n -hexane. KH602 improved the oil/water partition coefficient by 1.402-fold compared to conventional silicone oil. When used in the bioreactor, KH602 increased the elimination capacity by 33.3 % at an inlet concentration of 500 mg·m−3. KH602 also promoted microbial extracellular polymer secretion, with protein content increasing by 25 %. It stimulated a higher proportion of activated cells and enhanced their capacity to utilize n -hexane metabolic intermediates, particularly esters, which showed a 117.9 % increase. Biomass was enriched at the oil–water interface, facilitating the mass transfer of n -hexane via a "gas–oil–biological" pathway. Additionally, microbial genera with known or potential n -hexane degradation capabilities, including Mycobacterium and Gordonia , were enriched. These findings offer theoretical insights and technical support for the efficient treatment of hydrophobic VOCs. [Display omitted] • KH602 increased the oil/water partition coefficient of nH by 40.16 %. • Elimination capacities were improved by 33.3 % in KH602. • Protein contents were increased by 25 % in KH602. • The ability of microorganisms to utilize esters increased by 117.9 % in KH602. • KH602 allowed more n -hexane-degrading bacteria to adhere to the oil–water interface. [ABSTRACT FROM AUTHOR]
ISSN:01681656
DOI:10.1016/j.jbiotec.2025.10.002