A pilot-scale continuous-flow modified anaerobic-anoxic-oxic (MAAO) process examined the impact of external carbon sources (acetate, glucose, acetate/propionate) on ammonium assimilation, denitrifying phosphorus removal (DPR), and microbial community. Acetate exhibited superior efficacy in promoting the combined process of ammonia assimilation and DPR, enhancing both to 50.0 % and 60.0 %, respectively. Proteobacteria and Bacteroidota facilitated ammonium assimilation, while denitrifying phosphorus-accumulating organisms (DPAOs) played a key role in nitrogen (N) and phosphorus (P) removal. Denitrifying glycogen-accumulating organisms (DGAOs) aided N removal in the anoxic zone, ensuring stable N and P removal and recovery. Acetate/propionate significantly enhanced DPR (77.7 %) and endogenous denitrification (37.9 %). Glucose favored heterotrophic denitrification (29.6 %) but had minimal impact on ammonium assimilation. These findings provide valuable insights for wastewater treatment plants (WWTPs) seeking efficient N and P removal and recovery from low-strength wastewater.

中文翻译：

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低浓度废水改良厌氧-缺氧-好氧工艺中各种碳源对铵同化和反硝化除磷的评价

中试规模的连续流改良厌氧-缺氧-好氧 (MAAO) 工艺检查了外部碳源（乙酸盐、葡萄糖、乙酸盐/丙酸盐）对铵同化、反硝化除磷 (DPR) 和微生物群落的影响。醋酸盐在促进氨同化和 DPR 联合过程方面表现出卓越的功效，分别提高到 50.0% 和 60.0%。变形菌门和拟杆菌门促进了铵的同化，而反硝化聚磷生物（DPAO）在氮（N）和磷（P）的去除中发挥着关键作用。反硝化糖原积累生物（DGAO）有助于缺氧区的氮去除，确保稳定的氮和磷去除和回收。乙酸盐/丙酸盐显着增强 DPR (77.7 %) 和内源反硝化作用 (37.9 %)。葡萄糖有利于异养反硝化作用（29.6%），但对铵同化作用影响最小。这些研究结果为寻求从低浓度废水中高效去除和回收 N 和 P 的废水处理厂 (WWTP) 提供了宝贵的见解。