1. Metagenomic unveils the promotion of mainstream PD-anammox process at lower nZVI concentration and inhibition at higher dosage.
- Author
-
Ahmad HA, Sun X, Wang Z, Ahmad S, El-Baz A, Lee T, Ni BJ, and Ni SQ
- Subjects
- Bacteria, Metagenomics methods, Denitrification, Oxidation-Reduction, Metal Nanoparticles chemistry, Ammonium Compounds, Iron chemistry, Iron pharmacology, Nitrogen
- Abstract
The partial-denitrification-anammox (PdNA) process exhibits great potential in enabling the simultaneous removal of NO
3 - -N and NH4 + -N. This study delved into the impact of exogenous nano zero-valent iron (nZVI) on the PdNA process. Adding 10 mg L-1 of nZVI increased nitrogen removal efficiency up to 83.12 % and maintained higher relative abundances of certain beneficial bacteria. The maximum relative abundance of Candidatus Brocadia (1.6 %), Candidatus Kuenenia (1.5 %), Ignavibacterium (1.3 %), and Azospira (1.2 %) was observed at 10 mg L-1 of nZVI. However, the greatest relative abundance of Thauera (1.3 %) was recorded under 50 mg L-1 . Moreover, applying nZVI selectively enhanced the abundance of NO3 - -N reductase genes. So, keeping the nZVI concentration at 10 mg L-1 or below is advisable to ensure a stable PdNA process in mainstream conditions. Considering nitrogen removal efficiency, using nZVI in the PD-anammox process could be more cost-effective in enhancing its adoption in industrial and mainstream settings., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)- Published
- 2024
- Full Text
- View/download PDF