1. Achieving high nitrogen and antibiotics removal efficiency by nZVI-C in partial nitritation/anammox system with a single-stage membrane-aerated biofilm reactor.
- Author
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Song Z, Zhang L, Yang J, Ni SQ, and Peng Y
- Subjects
- Water Pollutants, Chemical metabolism, Membranes, Artificial, Ammonia metabolism, Oxidation-Reduction, Metal Nanoparticles chemistry, Charcoal chemistry, Waste Disposal, Fluid methods, Oxidoreductases, Bioreactors, Anti-Bacterial Agents, Biofilms, Nitrogen metabolism, Iron metabolism, Iron chemistry
- Abstract
This study innovated constructed an activated carbon-loaded nano-zero-valent iron (nZVI-C) enhanced membrane aerated biofilm reactor (MABR) coupled partial nitritation/anammox (PN/A) system for optimizing nitrogen and antibiotics removal. Results showed that nitrogen and antibiotic removal efficiencies of 88.45 ± 0.14% and 89.90 ± 3.07% were obtained by nZVI-C, respectively. nZVI-C hastened Nitrosomonas enrichment (relative abundance raised from 2.85% to 12.28%) by increasing tryptophan content in EPS. Furthermore, nZVI-C proliferated amo gene by 3.92 times and directly generated electrons, stimulating Ammonia monooxygenase (AMO) co-metabolism activity. Concurrently, via antibiotic resistance genes (ARGs) horizontal transfer, Nitrosomonas synergized with Arenimonas and Comamonadaceae for efficient antibiotic removal. Moreover, nZVI-C mitigated antibiotics inhibition of electron transfer by proliferating genes for PN and anammox electron production (hao, hdh) and utilization (amo, hzs, nir). That facilitated electron transfer and synergistic substrate conversion between ammonia oxidizing bacteria (AOB) and anaerobic ammonia oxidizing bacteria (AnAOB). Finally, the high nitrogen removal efficiency of the MABR-PN/A system was achieved., Competing Interests: Declaration of Competing Interest I acknowledge that I have consulted the Guide for Authors and have prepared the manuscript in compliance with the Publishing Policy as described in the Guide for Authors. This manuscript has not been published or presented elsewhere in part or in entirety and is not under consideration by another journal. This study is the original work of the authors, and all authors mutually agree that it should be submitted to your journal. We have read and understood your journal’s policies, and we believe that neither the manuscript nor the study violates any of these. There are no conflicts of interest to declare., (Copyright © 2024 Elsevier B.V. All rights reserved.)
- Published
- 2024
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