Abstract
In order to explore the operation performance, kinetic characteristics and bacterial community of the short-cut nitrification and denitrification (SND) system, the SND system with pre-cultured short cut nitrification and denitrification sludge was established and operated under different ferrous ion (Fe (II)) conditions. Experimental results showed that the average NH4+–N removal efficiency (ARE) of SND system was 97.3% on Day 5 and maintained a high level of 94.9% ± 1.3% for a long operation period. When the influent Fe(II) concentration increased from 2.3 to 7.3 mg L−1, the sedimentation performance, sludge concentration and organic matter removal performance were improved. However, higher Fe(II) of 12.3 mg L−1 decreased the removal of nitrogen and CODCr with the relative abundance (RA) of Proteobacteria and Bacteroidetes decreased to 30.28% and 19.41%, respectively. Proteobacteria, Bacteroidetes and Firmicutes were the dominant phyla in SND system. Higher Fe(II) level of 12.3 mg L−1 increase the RA of denitrifying genus Trichococcus (33.93%), and the denitrifying genus Thauera and Tolumonas dominant at Fe(II) level of no more than 7.3 mg L−1.
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This research was supported by Zhejiang Provincial Natural Science Foundation of China under Grant No. LY23E080006.
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Ben-ze Chang: Data curation, Software, Visualization, Writing, original draft, Conceptualization, Methodology.Shuai Zhang: Data curation, Formal analysis. Dong-zhi Chen: Data curation, Resources. Kai-tuo Gao:Data curation, review.Guangfeng Yang: Data curation, Methodology, Investigation,Visualization, Writing, review & editing, Resources.
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Chang, Bz., Zhang, S., Chen, Dz. et al. Performance, kinetic characteristics and bacterial community of short-cut nitrification and denitrification system at different ferrous ion conditions. Biodegradation (2024). https://doi.org/10.1007/s10532-024-10080-7
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DOI: https://doi.org/10.1007/s10532-024-10080-7