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| Characterization of molecular transformation and bioavailability of dissolved organic nitrogen in the A/A/O process |
| HAN Cheng-long, ZHAO Ling-yun, DUAN Bing, CUI Xian, LIU Cai-feng, HU Hai-dong, REN Hong-qiang |
| State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210023, China |
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Abstract The concentration distribution, molecular transformation, and bioavailability characteristics of DON along the anaerobic/anoxic/oxic (A2/O) process were investigated by various methods. The results showed that the concentration of DON decreased from (5.3±0.3)mg/L in the influent to (2.0±0.1)mg/L and (1.8±0.2)mg/L along the anaerobic and anoxic tanks respectively. Interestingly, the concentration of DON in the oxic unit increased to (1.9±0.1)mg/L, and the removal rate was (-5.6±0.6)%. Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) analysis of the molecular composition of DON showed that the proportion of active DON molecules (H/C≥1.5) in each unit was: anaerobic unit (38%)
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Received: 26 August 2022
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