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- W4229456225 abstract "• The nutrients and PAHs removal were highly enhanced in Si-CW. • The combination of siphon and magnetite formed the iron cycle in Si-CW. • Microbial degradation was the main mechanism of PAHs removal in CW. • PAH-degrading bacteria possessed better propagation and growth condition in Si-CW. • Si-CW had higher siderophores produced which promoted the PAHs removal. Due to its limited dissolved oxygen concentration, constructed wetland (CW) could not remove nutrients and benzo[a]pyrene (B[a]P) effectively. Therefore, in this study, a siphon was applied in CW (Si-CW) to create tidal flow to achieve efficient removal of nutrients and B[a]P, and the removal mechanism was explored. The results showed that the NH 4 + and TP removal values for the Si-CW were 55.95% ± 7.75% and 20.79% ± 8.39%, which exceeded those for the conventional CW (CCW). Alternative anaerobic and aerobic environments formed by siphon also enabled magnetite in Si-CW to form the iron cycle (Fe 2+ /Fe 3+ cycle), which promoted the occurrence of simultaneous nitrification and denitrification and hydrogen-utilizing autotrophic denitrification and improved nitrogen removal significantly. The mass balance showed that microbial degradation was the main mechanism of B[a]P removal (39.0% – 54.0%). Si-CW possessed better oxygen conditions and iron cycles, favoring the propagation and growth of B[a]P-degrading bacteria (i.e., Pseudoxanthomonas ) while enhancing the proportion of microbial degradation of B[a]P. Metagenomic analysis indicated that Si-CW had a higher TC.FEV.OM gene expression of Pseudoxanthomonas , which could regulate the siderophores produced by Pseudoxanthomonas through the metabolic pathway (K02014) of the iron complex outer-membrane receptor protein to achieve efficient B[a]P removal." @default.
- W4229456225 created "2022-05-11" @default.
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- W4229456225 date "2022-10-01" @default.
- W4229456225 modified "2023-10-16" @default.
- W4229456225 title "Highly enhanced removal of nutrients and benzo[a]pyrene in a siphon constructed wetland with magnetite: Performance and mechanisms" @default.
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- W4229456225 doi "https://doi.org/10.1016/j.cej.2022.136895" @default.
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