School of Environment, MOE Key Laboratory of Water and Sediment Sciences/State Key Lab of Water Environment Simulation, Beijing Normal University, Beijing 100875, China.
School of Civil and Architecture Engineering, Xi'an Technological University, Xi'an 710021, China.
Bioresour Technol. 2019 Mar;275:307-313. doi: 10.1016/j.biortech.2018.12.069. Epub 2018 Dec 21.
To assess the stability of aerobic granular sludge (AGS) under nitrogen deficiency conditions, three sequence batch reactors were operated with chemical oxygen demand (COD) to nitrogen (N) ratios of 100/5, 100/2.5, and 100/2, while COD concentration was kept consistent. AGS variations in its physicochemical characteristics, microbial community, and treatment performance were investigated. The results indicated that good treatment performance and stable AGS were achieved under nitrogen deficiency. Extracellular polymeric substances (EPS) regulating mechanism preserved AGS stability under nitrogen deficiency, especially through increased secretion of polysaccharide. In addition, members of the Anaerolineaceae were the major filamentous bacteria, which are strictly anaerobic organism, providing a possible explanation to the lack of filamentous bacteria outgrowth under N deficient condition. Insights from this study could help lower chemical costs in AGS applications for specific industrial wastewater treatments.
为评估在氮缺乏条件下好氧颗粒污泥（AGS）的稳定性，使用化学需氧量（COD）与氮（N）比值分别为 100/5、100/2.5 和 100/2 的三个序批式反应器，同时保持 COD 浓度一致。研究了 AGS 在理化特性、微生物群落和处理性能方面的变化。结果表明，在氮缺乏条件下可实现良好的处理性能和稳定的 AGS。胞外聚合物（EPS）调节机制在氮缺乏条件下保持 AGS 的稳定性，特别是通过增加多糖的分泌。此外，Anaerolineaceae 是主要的丝状菌，属于严格厌氧菌，这为在 N 缺乏条件下丝状菌生长不良提供了一种可能的解释。本研究的结果可以帮助降低 AGS 在特定工业废水处理中的应用中的化学成本。
