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DE-627 |
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20250911232505.0 |
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250911s2025 xx |||||o 00| ||eng c |
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|a 10.1080/09593330.2025.2556497
|2 doi
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|a pubmed25n1564.xml
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|a (DE-627)NLM392336480
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|a (NLM)40929468
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Xiang, Yu
|e verfasserin
|4 aut
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|a Nitrogen removal efficiency and pathways of the simultaneous nitrification and denitrification process under ultra-low oxygen conditions
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|c 2025
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Revised 10.09.2025
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|a published: Print-Electronic
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|a Citation Status Publisher
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|a To explore strategies for further reducing aeration energy consumption in the simultaneous nitrification and denitrification (SND) process, an SND reactor was constructed to treat low carbon-to-nitrogen (C/N) ratio domestic wastewater under ultra-low dissolved oxygen (DO) conditions (DO < 0.05 mg·L⁻1). The effects of hydraulic retention time (HRT) and C/N ratio on nitrogen removal performance were systematically evaluated, and batch experiments were conducted to determine nitrification and denitrification rates. Under influent condition of 50.0 mg·L⁻1 ammonia and a C/N ratio of 2.2, the reactor maintained stable ultra-low DO levels, achieved effluent ammonia concentrations below 5.0 mg·L⁻1, and attained optimal SND efficiencies exceeding 80.0%. Although a shortened HRT destabilised performance, increasing the C/N ratio successfully restored nitrogen removal stability. Nitrification and denitrification rates ranged from 4.20-30.89 mg·L⁻1·h⁻1 and 1.57-21.92 mg·L⁻1·h⁻1, respectively, under C/N ratios from 2.2-8.0. High-throughput sequencing and metagenomic analysis revealed that heterotrophic nitrification and aerobic denitrification dominated nitrogen transformation, with microorganisms utilising low-energy nap and nirK enzymes to adapt to the ultra-low DO environment. These findings provide novel insights into energy-efficient nitrogen removal pathways under ultra-low oxygen conditions
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|a Journal Article
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|a Simultaneous nitrification and denitrification
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4 |
|a carbon-to-nitrogen ratio
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4 |
|a dissolved oxygen concentration
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|a heterotrophic nitrification-aerobic denitrification
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| 650 |
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4 |
|a periplasmic nitrate reductase
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| 700 |
1 |
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|a Man, Xiangtian
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Zhang, Han
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Chen, Mengli
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Yang, Ruxin
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
|t Environmental technology
|d 1993
|g (2025) vom: 10. Sept., Seite 1-12
|w (DE-627)NLM098202545
|x 1479-487X
|7 nnas
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| 773 |
1 |
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|g year:2025
|g day:10
|g month:09
|g pages:1-12
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|u http://dx.doi.org/10.1080/09593330.2025.2556497
|3 Volltext
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