Rapid granulation was realized in a continuous-flow reactor with a two-zone sedimentation tank (CFR-TST), and a novel strategy involving the continuous addition of dewatered sludge during the start-up phase to treat the actual domestic sewage with low concentration. The selection pressure produced by the two-zone sedimentation tank can discharge light flocs with poor settleability and retain the fine particles in the reactor. The continuous addition of dewatered sludge in the start-up phase can increase the small particles in the aeration tank by acting as nuclei to accelerate granulation. The experimental results indicated that aerobic granular sludge (AGS) was formed successfully on day 25 (the sludge volume index at 5 min (SVI₅) was 37.7 mL/g, the mean particle size was 0.42 mm, and the average settling velocity was 35.2 m/h); after operated continuously for 45 days, the sedimentation capacity and biomass concentration were further enhanced (SVI₅ and the mixed liquor suspended solids (MLSS) were stable in the range of 25.8–31.3 mL/g and 4200−4600 mg/L, respectively). Although the dewatered sludge with low biological activity had a slight negative impact on pollutants degradation in the start-up phase, the biological activity of the sludge was enormously upgraded (compared with those of the inoculated dewatered sludge, the SOUR and dehydrogenase activity of the mature AGS increased 3.72 times and 5.01 times on day 84, respectively), and microbes that promote the secretion of EPS and facilitate the degradation of pollutants were enriched during the whole process of granulation. Moreover, the approach developed in this case was simple and eco-friendly for potential full-scale implementation.

在带有两区沉淀池（CFR-TST）的连续流反应器中实现了快速制粒，并且采用了一种新颖的策略，其中涉及在启动阶段连续添加脱水污泥以处理低浓度的实际生活污水。由两区沉淀池产生的选择压力可以排出沉降性较差的轻絮状物并将细颗粒保留在反应器中。在启动阶段连续添加脱水的污泥可通过充当核来加速造粒，从而增加曝气池中的小颗粒。实验结果表明，好氧颗粒污泥（AGS）在第25天成功形成（污泥体积指数为5分钟（SVI ₅）为37.7mL / g，平均粒径为0.42mm，平均沉降速度为35.2m / h）。连续运行45天后，沉淀能力和生物量浓度进一步提高（SVI ₅混合液悬浮固体（MLSS）的稳定范围分别为25.8-31.3 mL / g和4200-4600 mg / L。尽管具有低生物活性的脱水污泥在启动阶段对污染物的降解有轻微的负面影响，但是污泥的生物活性得到了极大的提高（与接种的脱水污泥的生物活性相比，成熟的污泥的SOUR和脱氢酶活性高）。在第84天，AGS分别增加了3.72倍和5.01倍，并且在整个制粒过程中，富含促进EPS分泌并促进污染物降解的微生物。此外，在这种情况下开发的方法对于潜在的全面实施而言是简单且环保的。