Performance evaluation and metagenomic analysis of sequencing batch reactor under transient 2,4,6-trichlorophenol shock

The transient chlorophenol shock under some emergency conditions might directly affect the pollutant removal of bioreactor. Therefore, the recovery of bioreactor performance after transient chlorophenol shock is a noteworthy issue. In the present research, the performance, antioxidant response, micr...

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Bibliographic Details
Published in:Journal of hazardous materials 2024-05, Vol.469, p.133983-133983, Article 133983
Main Authors: Chu, Guangyu, Wang, Qianzhi, Gao, Chang, Zhang, Zhiming, Jin, Chunji, Chen, Wenzheng, Lu, Shuailing, Guo, Liang, Gao, Mengchun
Format: Article
Language:English
Subjects:
2,4,6-trichlorophenol shock
Antioxidants
Bioreactors
Chlorophenols
Enzymatic activity
Functional genes
Metagenomic analysis
Nitrogen
Sequencing batch reactor
Sewage
Waste Disposal, Fluid
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Summary:The transient chlorophenol shock under some emergency conditions might directly affect the pollutant removal of bioreactor. Therefore, the recovery of bioreactor performance after transient chlorophenol shock is a noteworthy issue. In the present research, the performance, antioxidant response, microbial succession and functional genes of sequencing batch reactor (SBR) were evaluated under transient 2,4,6-trichlorophenol (2,4,6-TCP) shock. The chemical oxygen demand (COD) and ammonia nitrogen (NH4+-N) removal efficiencies decreased sharply in the first 4 days after 60 mg/L 2,4,6-TCP shock for 24 h and gradually recovered to normal in the subsequent 8 days. The nitrogen removal rates and their corresponding enzymatic activities rapidly decreased after transient 2,4,6-TCP shock and then gradually increased to normal. The increase of antioxidant enzymatic activity, Cu-Zn SOD genes and Fe-Mn SOD genes contributed to the recovery of SBR performance. The abundance of genes encoding ammonia monooxygenase and hydroxylamine dehydrogenase decreased after transient 2,4,6-TCP shock, including amoA, amoC and nxrA. Thauera, Dechloromonas and Candidatus_Competibacter played key roles in the restorative process, which provided stable abundances of narG, norB , norC and nosZ. The results will deeply understand into the effect of transient 2,4,6-TCP shock on bioreactor performance and provide theoretical basis to build promising recoveries strategy of bioreactor performance. [Display omitted] •Nitrogen removal rate sharply reduced after transient 2,4,6-trichlorophenol shock.•Transient 2,4,6-trichlorophenol shock promoted reactive oxygen species production.•The increase of genes SOD1 and SOD2 abundance could resist the peroxidation.•Transient 2,4,6-trichlorophenol shock reduced genes amoA, amoC and nxrA abundance.•Functional gene contribution shifted under transient 2,4,6- trichlorophenol shock.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2024.133983