Algal-bacterial granular sludge (ABGS) and bacterial granular sludge (BGS, control group) were operated over 240 days to investigate the role of algae in treating synthetic municipal wastewater. The results showed that algae significantly improved the removal efficiency of total nitrogen (TN). The nitrogen removal load of ABGS was 2.6 mg-N/g-VSS/day (22.8 %, light) and 1.1 mg-N/g-VSS/day (9.6 %, dark) higher than that of BGS, respectively, which was attributed to algae enhanced NH₃-N removal capacity in the anaerobic stage and increased the utilization efficiency of organics in denitrification. Algae increased the relative abundance of denitrifying bacteria, and ABGS (28.83 %) was higher than BGS (14.28 %). Moreover, the dominant phylum of algae was Chlorophyta (98.39 %), the chlorophyll-a was sustained at 1.28 ± 0.26 mg/g-VSS. Algae significantly increased the content of extracellular polymeric substances (EPS), and the increased polysaccharide came from the tightly bound EPS. This study expands the understanding of the role of algae in ABGS.

藻细菌颗粒污泥（ABGS）和细菌颗粒污泥（BGS，对照组）运行超过 240 天，以研究藻类在处理合成城市废水中的作用。结果表明，藻类显着提高了总氮（TN）的去除效率。ABGS 的脱氮负荷分别比 BGS 高 2.6 mg-N/g-VSS/day（22.8 %，浅色）和 1.1 mg-N/g-VSS/day（9.6 %，深色），分别为归因于藻类增强的NH ₃- 厌氧阶段的N去除能力，提高了反硝化中有机物的利用效率。藻类增加了反硝化细菌的相对丰度，ABGS（28.83%）高于BGS（14.28%）。此外，藻类的优势门是绿藻门（98.39 %），叶绿素-a 维持在 1.28 ± 0.26 mg/g-VSS。藻类显着增加了细胞外聚合物（EPS）的含量，增加的多糖来自紧密结合的EPS。这项研究扩展了对藻类在 ABGS 中作用的理解。