Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Jinjing Road #26, Tianjin, 300384, PR China; Beijing Enterprises Water Group (China) Investment Limited, BEWG Building, Poly International Plaza T3, Zone 7, Wangjingdongyuan, Chaoyang District, Beijing, 100102, PR China.
Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Jinjing Road #26, Tianjin, 300384, PR China.
Environ Res. 2022 Jun;209:112743. doi: 10.1016/j.envres.2022.112743. Epub 2022 Jan 20.
The aerobic granular sludge simultaneous partial nitrification, denitrification and phosphorus removal (AGS-SPNDPR) process was carried out via tapered aeration in sequencing batch reactor (SBR) for treating low strength and low COD/TN ratio municipal wastewater. The results showed that aerobic granular sludge was successfully cultivated with good sedimentation performance when treating the municipal wastewater. Meanwhile, the median granule size increased to 270 (R1) and 257 (R2) μm on day 80. The excellent removal performance of COD (92%) and NH-N (95%) were achieved under different aeration modes, while the higher TN removal efficiency (76%) was achieved by tapered aeration. The accumulation of NO-N in R2 indicated that the tapered aeration was beneficial to achieve simultaneously partial nitrification and denitrification. Meanwhile, the high-efficiency phosphorus (95%) removal was realized via additional carbon source, and SPNDPR process was formed under tapered aeration. The bacterial community analysis indicated denitrifying glycogen-accumulating organisms (DGAOs) Candidatus_Competibacter and ammonia-oxidizing bacteria (AOB) Nitrosomonas were more effectively enriched via tapered aeration, while phosphorus-accumulating organisms (PAOs) Candidatus_Accumulibacter were effectively enriched under additional organic carbon. AOB, denitrifying bacteria and PAOs were simultaneously enriched by tapered aeration and additional carbon source, which was beneficial to nutrients removal. This study might be conducive to the application of AGS-SPNDPR system for treating low strength and low COD/TN ratio municipal wastewater under tapered aeration.
采用变曝气方式的序批式反应器（SBR）中实现了好氧颗粒污泥同步硝化反硝化除磷（AGS-SPNDPR）工艺，用于处理低浓度、低 COD/TN 比的市政废水。结果表明，当处理市政废水时，成功培养出具有良好沉降性能的好氧颗粒污泥。同时，在第 80 天，中值颗粒尺寸分别增加到 270（R1）和 257（R2）μm。在不同曝气模式下，COD（92%）和 NH-N（95%）均具有优异的去除效果，而通过变曝气实现了更高的 TN 去除效率（76%）。R2 中 NO-N 的积累表明变曝气有利于实现同时的部分硝化和反硝化。同时，通过添加额外的碳源实现了高效的磷（95%）去除，在变曝气下形成了 SPNDPR 工艺。细菌群落分析表明，通过变曝气更有效地富集了反硝化糖原积累菌（DGAOs）Candidatus_Competibacter 和氨氧化菌（AOB）Nitrosomonas，而通过添加额外的有机碳更有效地富集了聚磷菌（PAOs）Candidatus_Accumulibacter。AOB、反硝化细菌和 PAOs 通过变曝气和外加碳源同时富集，有利于养分去除。本研究可能有助于在变曝气和外加碳源条件下应用 AGS-SPNDPR 系统处理低浓度、低 COD/TN 比的市政废水。
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