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- Title
Effect of exogenous folate addition on the start-up process of single-stage partial nitritation-anammox system.
- Authors
Hu, Xingxing; Liu, Lingjie; Bi, Yanmeng; Meng, Fansheng; Li, Lu; Qiu, Chunsheng; Yu, Jingjie; Wang, Shaopo
- Abstract
In this study, two lab-scale reactors were operated to evaluate the impact of exogenous folate on the start-up process of single-stage partial nitritation-anammox (SPNA). Folate at a dose of 0.5, 1.0, and 1.5 mg/L was continuously added into the experimental reactor (RI) at different operation stages. The highest nitrogen removal rate was 0.26 kg N/(m3•d) in RI with a nitrogen loading rate of 0.45 kg N/(m3•d), which was higher than that in the control reactor (RII) of 0.20 kg N/(m3•d). Moreover, the extracellular polymeric substances production in RI with 1.5 mg/L folate dosage was 264.24 ± 6.74 mg/gVSS, enhancing by 0.5-fold that of the RII, and the activity of hydrazine oxidase increased to the highest level of 0.37 ± 0.01 μmol cyt- c /(gVSS•s). Meanwhile, the activity of dehydrogenase in RI was enhanced from 796.39 ± 2.19 μg/(gVSS•min) to 819.17 ± 24.47 μg/(min•gVSS). The relative abundance of Candidatus Brocadia was 0.64 % at the end of phase 5 in RI whereas it remained at 0.25 % in RII. Function prediction showed that the nitrogen-related genes highly increased with the folate addition. [Display omitted]
- Subjects
NEW business enterprises; FOLIC acid; HYDRAZINE; CANDIDATUS; HYDRAZINES; NITROGEN
- Publication
Process Safety & Environmental Protection: Transactions of the Institution of Chemical Engineers Part B, 2024, Vol 181, p87
- ISSN
0957-5820
- Publication type
Article
- DOI
10.1016/j.psep.2023.11.003