Efficient manganese ammonia oxidation (Mnammox) and its influencing factors at low temperature: Metal oxide-mediated denitrification process in water bodies.

Autor: Guanglei L; School of Municipal and Environmental Engineering, Shenyang Jianzhu University, Shenyang 110168, China., Tabassum S; Department of Chemistry, Faculty of Science, Sakarya University, Sakarya 54187, Turkey; Biomedical, Magnetic and Semiconductor Materials Research Center (BIMAS-RC), Sakarya University, Sakarya 54187, Turkey. Electronic address: tsalma@sakarya.edu.tr., Li J; School of Municipal and Environmental Engineering, Shenyang Jianzhu University, Shenyang 110168, China. Electronic address: junlee@sjzu.edu.cn., Altundag H; Department of Chemistry, Faculty of Science, Sakarya University, Sakarya 54187, Turkey; Biomedical, Magnetic and Semiconductor Materials Research Center (BIMAS-RC), Sakarya University, Sakarya 54187, Turkey.
Jazyk: angličtina
Zdroj: Bioresource technology [Bioresour Technol] 2024 Dec; Vol. 414, pp. 131617. Date of Electronic Publication: 2024 Oct 10.
DOI: 10.1016/j.biortech.2024.131617
Abstrakt: This study explores the metal oxide-mediated NH 4 + -N reduction process: manganese ammonia oxidation efficiency, influencing factors and its resistance to low-temperature environments in water bodies. After 177d of stabilized startup of an up-flow reactor, NH 4 + -N removal efficiency was 63.51 %, total nitrogen (TN) removal rate was 0.021 kg/(m 3 .d), and effluent Mn 2+ concentration was 1.503 mg/L, which was in dynamic equilibrium. X-ray photoelectron spectroscopy exhibited manganese valence state 3.29, similar to biological manganese oxidation. High-throughput sequencing revealed that phyla's denitrification function increased relative abundance, and manganese-reducing bacterial genera appeared. The batch test showed that 5 mg MnO 2 had NH 4 + -N removal at 85.01 %. After 44 days, NH 4 + -N removal efficiency was 77.47 %, effluent Mn 2+ concentration was 3.280 mg/L, TN removal rate was 0.063 kg/(m 3 .d). The long-term effect of the influent load change on the denitrification and Mnammox efficiency at 25 ∼ 15 °C was examined. Effluent Mn 2+ concentration was 1.811 mg/L was relatively stable. Manganese valence decreased from 3.29 to 3.20, Mn 4+ decreased by 9.58 %, while Mn 3+ and Mn 2+ increased by 10.94 % and 1.37 %, respectively. A new phylum Thermotogota and genus SBR1031 appeared in the microbial community.
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.)
Databáze: MEDLINE
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