Removal of high-molecular-weight polycyclic aromatic hydrocarbons by a microbial consortium immobilized in magnetic floating biochar gel beads

A bacterial consortium immobilized in magnetic floating biochar gel beads is proposed to remove high-molecular-weight polycyclic aromatic hydrocarbons. The microbial consortium performed better than single strains and consisted of four strains of marine bacteria for degrading pyrene (PYR), two strai...

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Bibliographic Details
Published in:Marine pollution bulletin 2020-10, Vol.159, p.111489-111489, Article 111489
Main Authors: Qiao, Kaili, Tian, Weijun, Bai, Jie, Wang, Liang, Zhao, Jing, Song, Tiantian, Chu, Meile
Format: Article
Language:English
Subjects:
Andrews model
Aromatic compounds
Aromatic hydrocarbons
Beads
Benzo(a)pyrene
Biodegradation
Charcoal
Consortia
Floating
Gel beads
Gels
HMW-PAHs
Immobilization
Immobilized cells
Kinetics
Magnetic field
Magnetic fields
Magnetic properties
Microbial consortium
Microbiological strains
Microorganisms
Molecular weight
Oil pollution
Polycyclic aromatic hydrocarbons
Pyrene
Removal
Seawater
Strains (organisms)
Temperature tolerance
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Summary:A bacterial consortium immobilized in magnetic floating biochar gel beads is proposed to remove high-molecular-weight polycyclic aromatic hydrocarbons. The microbial consortium performed better than single strains and consisted of four strains of marine bacteria for degrading pyrene (PYR), two strains for benzo(a)pyrene (BAP), and three strains for indeno(1,2,3-cd)pyrene (INP), which were isolated from oil-contaminated seawater. The immobilized cells could biodegrade 89.8%, 66.9% and 78.2% of PYR, BAP and INP, respectively, and had better tolerance to pH, temperature and salinity than free cells. The Andrews model was used to explore the biodegradation kinetics, and when the initial concentrations of PYR, BAP, and INP were 7.80, 3.05, and 3.41 mg/L, the specific biodegradation rates reached maximum values of 0.2507, 0.1286, and 0.1930 d−1, respectively. The immobilized microbial consortium had a high HMW-PAH removal ability and good floatability and magnetic properties and could be collected by an external magnetic field. •The microbial consortium has great biodegradation efficiency on HMW-PAHs.•Magnetic floating biochar gel bead is a good support material to immobilize cells.•Immobilized microbial consortium has high removal ability in adverse environment.•The Andrews model is appropriate to explore the kinetics of the immobilized cells.
ISSN:0025-326X
1879-3363
DOI:10.1016/j.marpolbul.2020.111489