Abstract
This study investigated the influence of aeration rates on the denitrification performance and microbial community of heterotrophic nitrification-aerobic denitrification (HN-AD) bacteria-inoculated MBBR systems treating nitrate wastewater. The results demonstrated high removal efficiencies for COD (93.8 %) and TN (86.2 %) at an optimal aeration rate of 1 mL/min, indicating enhanced TN removal with reduced energy consumption. High-throughput sequencing results revealed that Proteobacteria, Bacteroidota, and Chloroflexi were key players in denitrification, with notable genera including Stappia, Thauera, norank_f__A4b, SM1A02, Pseudomonas, and Flavobacteria. HN-AD bacteria Stappia and Thauera played the key denitrification role at 1 mL/min and lower aeration rate was more conducive to the enrichment of Stappia and Thauera. Functional gene analysis further highlighted the importance of narG, narH and narI in denitrification processes.
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