Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 285, Issue -, Pages -Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2021.112119
Keywords
Pyridine; Quinoline; Synergy; Biodegradation; Bacillus sp
Categories
Funding
- ability construction project of local Colleges and Universities in Shanghai [16070503000]
- State Key Joint Laboratory of Environment Simulation and Pollution Control [16K10ESPCT]
- Shanghai Gaofeng & Gaoyuan Project for University Academic Program Development
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Three bacterial strains were isolated from activated sludge adapted to degrade pyridine and quinoline simultaneously, with Rhodococcus ruber demonstrating the fastest kinetics. Combining R. ruber with one or both of the Bacillus strains further increased the biodegradation kinetics. The three strains together significantly reduced the time needed for complete biodegradation compared to using R. ruber alone.
Three bacterial strains were isolated from activated sludge acclimated to biodegrade pyridine and quinoline simultaneously. The strains were identified as Bacillus tropicus, Bacillus aquimaris, and Rhodococcus ruber. When the isolated bacteria were used for pyridine and quinoline biodegradation in separate or combined modes, R. ruber had much faster kinetics, and combining R. ruber with one or both of the Bacillus strains increased further the biodegradation kinetics. For example, the time needed for complete biodegradation of 1 mM quinoline and pyridine decreased to 20 h and 6 h, respectively, with the three strains combined, compared to 26 h and 7 h with R. ruber alone. Whereas quinoline was completely mineralized by all three strains, 10?14% of the pyridine persisted as a dead-end product, 2-hydroxypyridine (2HP). The acclimated sludge from which the three bacterial species were isolated was able to transform 2HP, and adding the bacterial strains (especially R. ruber) to the acclimated sludge accelerated the rate of 2HP removal and mineralization through a form of synergy.
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