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. 2024 Aug;35(5):621-639.
doi: 10.1007/s10532-024-10080-7. Epub 2024 Apr 15.

Performance, kinetic characteristics and bacterial community of short-cut nitrification and denitrification system at different ferrous ion conditions

Ben-Ze Chang  1 , Shuai Zhang  1 , Dong-Zhi Chen  1   2 , Kai-Tuo Gao  1   3 , Guang-Feng Yang  4   5
Affiliations

Performance, kinetic characteristics and bacterial community of short-cut nitrification and denitrification system at different ferrous ion conditions

Ben-Ze Chang et al. Biodegradation. 2024 Aug.

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.

Keywords: Apparent affinity; Ferrous ion; Nitrogen removal; Short-cut nitrification and denitrification.

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Conflict of interest statement

The authors declare no competing interests.

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