Augmentation of nitrogen removal by MBF bio-nests supplemented with nano-Fe2O3
Addressing the issue of low C/N ratio in municipal wastewater in China,this study aims to investigate the enhanced nitrogen removal efficacy and its mechanism of nano-iron oxide in an MBF bio-nest reactor treating municipal wastewater with low C/N ratio.As nano-iron oxide was added to the MBF bio-nest treating actual municipal wastewater with low C/N ratio,the nitrogen removal efficiency and carbon source utilization were monitored,and the microbial community structure and functional gene expression levels were also analyzed,then the performance on treating wastewater with low C/N ratio was evaluated.The results showed that addition of nano-iron oxide significantly increased the nitrogen removal efficiency of the reactor by 58％.Microbial community structure analysis revealed that nano-iron oxide affected the relative abundance of specific nitrogen-removing microorganisms.Functional gene expression analysis found that nano-iron oxide downregulated the expression of electron transfer proteins on the outer membrane of microorganisms,reducing interspecies electron transfer and thereby enhancing the effective utilization of electrons within the cells.Above results indicated that nano-iron oxide increased the efficiency of carbon source utilization and effectively removed nitrogen from municipal wastewater with low C/N ratio through regulating microbial community structure and functional gene expression.This provides a new technical approach for municipal wastewater treatment.
nano-iron oxidebiological nestbiological contact oxidation reactorlow carbon-to-nitrogen ratio sewagedenitrification efficiency
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