Enhanced biodegradation of n-hexane in a two-phase partitioning bioreactor inoculated with Pseudomonas mendocina NX-1 under chitosan stimulation

Two-phase partitioning bioreactors (TPPBs) have been extensively used for volatile organic compounds (VOCs) removal. To date, most studies have focused on improving the mass transfer of gas phases/non-aqueous phases (NAPs)/aqueous phases, whereas the NAP/biological phases and gas/biological phases t...

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Bibliographic Details
Published in:Journal of hazardous materials 2021-10, Vol.419, p.126330-126330, Article 126330
Main Authors: Chen, Dong-Zhi, Liu, Hao-Yang, Yu, Yang, Yu, Ning-Ning, Ye, Jie-Xu, Cheng, Zhuo-Wei, Zhang, Shi-Han, Chen, Jian-Meng
Format: Article
Language:English
Subjects:
Cell surface hydrophobicity
Chitosan
n-hexane
Silicone oil
Two-phase partitioning bioreactor
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Summary:Two-phase partitioning bioreactors (TPPBs) have been extensively used for volatile organic compounds (VOCs) removal. To date, most studies have focused on improving the mass transfer of gas phases/non-aqueous phases (NAPs)/aqueous phases, whereas the NAP/biological phases and gas/biological phases transfer has been neglected. Herein, chitosan was introduced into a TPPB to increase cell surface hydrophobicity (CSH) and improve the n-hexane mass transfer. The performance and stability of the TPPB with chitosan for n-hexane biodegradation were investigated, and it was found out that the TPPB with chitosan achieved maximum removal efficiency and elimination capacity of 80.6% and 26.5 g m−3 h−1, thereby reaching much higher values than those obtained without chitosan (61.3% and 15.2 g m−3 h−1). Chitosan not only obvio usly increased cell surface hydrophobicity and cell dry biomass on the surface of silicone oil, but might also allow hydrophobic cells in aqueous phases to directly capture and biodegrade n-hexane, resulting in an obvious improvement of mass transfer from the gas phase to biomass. Stability enhancement was another attractive advantage from chitosan addition. This study might provide a new strategy for the development of TPPB in the hydrophobic VOCs treatment. [Display omitted] •Removal of n-hexane was enhanced in a TPPB with chitosan.•Chitosan was introduced into a TPPB to increase cell surface hydrophobicity.•The mass transfer of n-hexane was improved in a TPPB with chitosan.•Cell dry biomass on the surface of oil was increased in a TPPB with chitosan.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2021.126330