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Wu, Haizhen; Wang, Ming; Zhu, Shuang; Xie, Junting; Preis, Sergei; Li, Fusheng; Wei, Chaohai
Chemosphere (Oxford), 08/2019, Volume: 228Journal Article
Coking wastewater (CWW) contains high contents of phenols and other toxic and refractory compounds including polycyclic aromatic hydrocarbons (PAHs) with the most carcinogenic benzoapyrene (BaP) among them. The mechanism of PAHs/BaP degradation in activated sludge of CWW treatment with phenol as co-substrate was studied. For characterizing the structure and functions of microbial community associated with BaP degradation with phenol as co-substrate, high-throughput MiSeq sequencing was used to examine the 16S rRNA genes of microbiology, revealing noticeable shifts in CWW activated sludge bacterial populations. Major genera involved in anaerobic degradation were Tissierella_Soehngenia, Diaphorobacter and Geobacter, whereas in aerobic degradation Rhodanobacter, Dyella and Thauera prevailed. BaP degradation with phenol as co-substrate induced bacterial diversification in CWW activated sludge in opposite trends when anaerobic and aerobic conditions were applied. In order to predict the microbial community functional profiling, a bioinformatics software package of phylogenetic investigation of communities by reconstruction of unobserved states (PICRUSt) was run to find that some dominant genera enriched in the BaP pathway may own the ability to degrade PAHs/BaP. Further experiments should focus on testing the dominant genera in BaP degradation at different oxygen levels. •Phenol as co-substrate improves BaP biodegradation in activated sludge of CWW.•Degradation of BaP with phenol as co-substrate induced notable microbial diversity changes.•Opposite bacterial diversity trends appeared in anaerobic and aerobic biodegradation of BaP with phenol as co-substrate.•Phenol as co-substrate changed the microbial populations in favor of BaP degrading species.
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