Degradation of Decabromodiphenyl Ether in an Aerobic Clay Slurry Microcosm Using a Novel Immobilization Technique

A novel chitosan immobilization technique that entraps photocatalyst and microbes was developed and applied to decompose decabromodiphenyl ether (BDE-209) in a clay slurry microcosm. The optimized conditions for immobilization were obtained by mixing 1.2% ( / ) chitosan dissolved in 1% ( / ) acetic...

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Published in:Microorganisms (Basel) 2022-02, Vol.10 (2), p.402
Main Authors: Hsu, Jung-Shan, Yu, Ting-Yu, Wei, Da-Jiun, Jane, Wann-Neng, Chang, Yi-Tang
Format: Article
Language:English
Subjects:
Acetic acid
Bacteria
Beads
Biodegradation
Bioremediation
Carbon
Chemicals
Chitosan
chitosan immobilization
Clay
Crosslinking
decabromodiphenyl ether
Free radicals
Immobilization
Irradiation
Laboratories
Mechanical properties
Mixed culture
Nanoparticles
Photocatalysis
Photodegradation
Photolysis
Pollutants
Polybrominated diphenyl ethers
Slurries
Sodium triphosphate
Sodium tripolyphosphate
Titanium dioxide
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Summary:A novel chitosan immobilization technique that entraps photocatalyst and microbes was developed and applied to decompose decabromodiphenyl ether (BDE-209) in a clay slurry microcosm. The optimized conditions for immobilization were obtained by mixing 1.2% ( / ) chitosan dissolved in 1% ( / ) acetic acid with nano-TiO particles and the BDE-209-degrading bacterial mixed culture. This aqueous mixture was injected into 1% ( / ) water solution containing sodium tripolyphosphate to form spherical immobilized beads. The surface of the immobilized beads was reinforced by 0.25% ( / ) glutaraldehyde cross-linking. These beads had enough mechanical strength during BDE-209 degradation to maintain their shape in the system at a stirring rate of 200-rpm, while undergoing continuous 365 nm UVA irradiation. This novel TiO -Yi-Li immobilized chitosan beads system allowed a successful simultaneous integration of photolysis, photocatalysis and biodegradation to remove BDE-209. The remaining percentage of BDE-209 was 41% after 70 days of degradation using this system. The dominant bacteria in the BDE-209-degrading bacterial mixed culture during remediation were spp., spp., spp. and spp. These bacteria tolerated the long-term UVA irradiation and high-level free radicals present, while utilizing BDE-209 as their primary carbon resource. This new method has great potential for the treatment of a range of pollutants.
ISSN:2076-2607
2076-2607
DOI:10.3390/microorganisms10020402