中文摘要：

丝状菌膨胀是好氧颗粒污泥（AGS）不稳定的主要原因之一，然而，对于这种失稳的AGS的修复研究国内外尚较少涉及。因此，在SBR中接种发生丝状菌膨胀的AGS，通过逐步缩短沉降时间及降低C／N值，研究失稳AGS的修复进程及对污染物的去除效果。观察发现，失稳的AGS外表毛糙、结构松散且很不稳定，修复过程中部分大颗粒经历了先解体后重新颗粒化的过程，且解体的颗粒污泥可以作为新颗粒污泥形成的晶核及载体。失稳AGS的修复时间稍短于直接利用活性污泥培养AGS的：19d时大部分颗粒表面已经比较光滑，25d时AGS在反应器中已占主导，30d时完全重新实现颗粒化（颗粒化率为91．48％），此时的AGS外表光滑、形状规则，但颜色偏淡。44d时AGS呈明显的黄色、结构致密，SVI、平均粒径及颗粒化率分别为65．77mL／g、1．42mm及95．19％。最终，出水COD、TIN、NH4^＋-N及TP分别为41．12、6．17、3．67及0．54mg／L，相应的去除率分别为95％、92％、95％及97％。

英文摘要：

Filamentous bulking is one of the main reasons causing the instability of aerobic granular sludge （AGS）. However, few researches were conducted to remedy the instable AGS at home and abroad. Therefore, the AGS with filamentous bulking was inoculated in SBR. The remediation process of instable AGS and the removal efficiency of pollutants were investigated by gradually reducing settling time and C/N ratio. It was observed that the instable AGS had rough surface, loose and instable structure. During the remediation, the majority of large granules experienced the process of first disintegration and then regranulation, and the disintegrated granules could serve as the crystal nucleus and catalyst carrier for the new granules. The time for remediation of the instable AGS was shorter than that of direct cultivation of AGS by using activated sludge. On the 19th day, the surface of most AGS was relatively smooth. AGS was dominated in the reactor on the 25th day. The reactor realized aerobic granulation completely on the 30th day, and the granulation rate was 91.48%, while the granules were smooth, regular-shaped and pale in color. On the 44th day, AGS was obviously yellow with dense structure, and SVI, average particle size and granulation rate were 65.77 mL/g, 1.42 mm and 95.19% respectively. Finally, the concentrations of COD, TIN, NH^4＋ - N and TP in the effluent were 41.12 mg/L, 6.17 mg/L, 3.67 mg/L and 0.54 mg/L respectively, and the corresponding removal rates were 95%, 92% , 95% and 97%.