Comparative investigation on a hexane-degrading strain with different cell surface hydrophobicities mediated by starch and chitosan

Chen, Dong Zhi; Jiang, Ning; Ye, Jie Xu; Cheng, Zhuo; Zhang, Shihan; Chen, Jian Meng

doi:10.1007/s00253-017-8100-4

Cited by 12 publications

(2 citation statements)

References 29 publications

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“… Chen et al (2017) discovered that a higher negative zeta potential of of EPS is more beneficial for generating migration potential and increasing the probability of collision between the pollutant molecules and degrading strains. The analysis results show that the zeta potential of the biofilm EPS in the B-BF changed from −13.7 mV to −9.5 mV.…”

Section: Resultsmentioning

confidence: 99%

A comparison of the performance of bacterial biofilters and fungal–bacterial coupled biofilters in BTEp-X removal

Wang,

Xue,

Nan

et al. 2024

PeerJ

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Background Conventional biofilters, which rely on bacterial activity, face challenges in eliminating hydrophobic compounds, such as aromatic compounds. This is due to the low solubility of these compounds in water, which makes them difficult to absorb by bacterial biofilms. Furthermore, biofilter operational stability is often hampered by acidification and drying out of the filter bed. Methods Two bioreactors, a bacterial biofilter (B-BF) and a fungal–bacterial coupled biofilter (F&B-BF) were inoculated with activated sludge from the secondary sedimentation tank of the Sinopec Yangzi Petrochemical Company wastewater treatment plant located in Nanjing, China. For approximately 6 months of operation, a F&B-BF was more effective than a B-BF in eliminating a gas-phase mixture containing benzene, toluene, ethylbenzene, and para-xylene (BTEp-X). Results After operating for four months, the F&B-BF showed higher removal efficiencies for toluene (T), ethylbenzene (E), benzene (B), and para-X (p-Xylene), at 96.9%, 92.6%, 83.9%, and 83.8%, respectively, compared to those of the B-BF (90.1%, 78.7%, 64.8%, and 59.3%). The degradation activity order for B-BF and F&B-BF was T > E > B > p-X. Similarly, the rates of mineralization for BTEp-X in the F&B-BF were 74.9%, 66.5%, 55.3%, and 45.1%, respectively, which were higher than those in the B-BF (56.5%, 50.8%, 43.8%, and 30.5%). Additionally, the F&B-BF (2 days) exhibited faster recovery rates than the B-BF (5 days). Conclusions It was found that a starvation protocol was beneficial for the stable operation of both the B-BF and F&B-BF. Community structure analysis showed that the bacterial genus Pseudomonas and the fungal genus Phialophora were both important in the degradation of BTEp-X. The fungal-bacterial consortia can enhance the biofiltration removal of BTEp-X vapors.

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Section: Resultsmentioning

confidence: 99%

A comparison of the performance of bacterial biofilters and fungal–bacterial coupled biofilters in BTEp-X removal

Wang,

Xue,

Nan

et al. 2024

PeerJ

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“…This indicated that the EPS had little effect on the adsorption of SCCPs by E. coli strain 2, and it was hypothesized that the lipids absorbed most of the SCCPs [56]. Previous observations have revealed that the surface hydrophobicity of bacteria is closely related to the content of surface lipopolysaccharides in the outer bacterial cell walls [57].…”

Section: Cell Surface Hydrophobicity Analysismentioning

confidence: 97%

Effects of Pressurized Aeration on the Biodegradation of Short-Chain Chlorinated Paraffins by Escherichia coli Strain 2

Qian

Han

Zhou³

et al. 2022

Membranes

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Short-chain chlorinated paraffins (SCCPs) were defined as persistent organic pollutants in 2017, and they can migrate and transform in the environment, accumulate in organisms, and amplify through the food chain. Although they pose a serious threat to environmental safety and human health, there are few papers on their removal. The current SCCP removal methods are expensive, require severe operating conditions, involve time-consuming biological treatment, and have poor removal specificities. Therefore, it is important to seek efficient methods to remove SCCPs. In this paper, a pressurized reactor was introduced, and the removal performance of SCCPs by Escherichia coli strain 2 was investigated. The results indicated that moderate pure oxygen pressurization promoted bacterial growth, but when it exceeded 0.15 MPa, the bacterial growth was severely inhibited. When the concentration of SCCPs was 20 mg/L, the removal rate of SCCPs was 85.61% under 0.15 MPa pure oxygen pressurization for 7 days, which was 25% higher than at atmospheric pressure (68.83%). In contrast, the removal rate was only 69.28% under 0.15 MPa air pressure. As the pressure continued to increase, the removal rate of SCCPs decreased significantly. The total amount of extracellular polymeric substances (EPS) increased significantly upon increasing the pressure, and the amount of tightly bound EPS (TB-EPS) was higher than that of loosely bound EPS (LB-EPS). The pressure mainly promoted the secretion of proteins in LB-EPS. Furthermore, an appropriate pure oxygen pressure of 0.15 MPa improved the dehydrogenase activity. The gas chromatography–mass spectrometry (GC–MS) results indicated that the degradation pathway possibly involved the cleavage of the C–Cl bond in SCCPs, which produced Cl−, followed by C–C bond breaking. This process degraded long-chain alkanes into short-chain alkanes. Moreover, the main degradation products detected were 2,4-dimethylheptane (C9H20), 2,5-dimethylheptane (C9H20), and 3,3-dimethylhexane (C8H18).

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Crystal substrate inhibition during microbial transformation of phytosterols in Pickering emulsions

Zhao

Xie

Zhang

et al. 2022

Appl Microbiol Biotechnol

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Comparative investigation on a hexane-degrading strain with different cell surface hydrophobicities mediated by starch and chitosan

Cited by 12 publications

References 29 publications

A comparison of the performance of bacterial biofilters and fungal–bacterial coupled biofilters in BTEp-X removal

A comparison of the performance of bacterial biofilters and fungal–bacterial coupled biofilters in BTEp-X removal

Effects of Pressurized Aeration on the Biodegradation of Short-Chain Chlorinated Paraffins by Escherichia coli Strain 2

Crystal substrate inhibition during microbial transformation of phytosterols in Pickering emulsions

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