A continuous-flow reactor with two-zone sedimentation tank (CFR-TST) was developed to evaluate the formation of aerobic granular sludge (AGS). Micropowder made of excess sludge was added for a while in the CFR-TST, and selection pressure associated with settling time was created by the two-zone sedimentation tank. To avoid AGS disintegration, an airlift system for sludge return was used. The results show that AGS (mean particle size of 105μm; sludge volume index of approximately 26mL/g) was formed successfully in the CFR-TST. The micropowder induced bacterial attachment by acting as nuclei. The two-zone sedimentation tank made the well settling granules (i.e., heavy sludge) always retained in the CFR and poorly settling flocs (i.e., light sludge) washed away. After granulation, the contents of extracellular polymeric substances and metal precipitations in sludge increased, and the microbial community changed obviously. Additionally, the effluent concentrations of CODCr and NH4+-N were relatively low after granulation.

中文翻译：

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在开发的带有两区沉淀池的连续流反应器中培养好氧颗粒污泥，处理真实和低强度废水


开发了一种带有两区沉淀池 （CFR-TST） 的连续流反应器，用于评估好氧颗粒污泥 （AGS） 的形成。在 CFR-TST 中加入由过量污泥制成的微粉一段时间，并通过两区沉淀池产生与沉降时间相关的选择压力。为避免 AGS 分解，使用了用于污泥返回的气升系统。结果表明，在 CFR-TST 中成功形成 AGS（平均粒径为 105μm;污泥体积指数约为 26mL/g）。微粉通过充当细胞核诱导细菌附着。两区沉淀池使沉降良好的颗粒（即重污泥）始终保留在 CFR 中，并冲走沉降不良的絮凝物（即轻质污泥）。造粒后，污泥中胞外聚合物物质和金属沉淀物含量增加，微生物群落发生明显变化。此外，造粒后出水中 CODCr 和 NH4+-N 的浓度相对较低。