Abstract
This study evaluated the performance of thiosulfate-driven denitratation (TDD) systems. The results demonstrated that a cycle time of 4.00 h was adequate for NO3--N removal and NO2--N accumulation (average NO3--N removal efficiencies (NREs): 95%; average NO3--N accumulation efficiencies (NAEs): 79%) under pH range of 6.50–9.50. According to metagenomic research, the enrichment of dominant denitrifiers is essential for the pH responsiveness of the TDD system. Furthermore, interspecific microorganism cooperation and the potential selective advantage of NO3--N reducing bacteria over NO2--N reducing bacteria contributed to a higher NO2--N accumulation efficiency. In addition, the results revealed that the reduction in hydraulic loading time (HRT) improved metabolic activities (i.e., energy metabolism). Overall, this study broadened the application potential of the TDD system and enhanced the understanding of microbial niches and the metabolic potential of autotrophic denitrification from electron transfer and metagenomic insights.
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