WU Yue,ZHAO Chuan-feng,SUN Fa-wen,et al.Feasibility of Aerobic Granular Sludge Formation in Continuous Flow Reactor Based on Two-zone Sedimentation Tank[J].China Water & Wastewater,2020,36(19):9-15.
双区沉淀池用于连续流好氧颗粒污泥工艺的可行性
- Title:
- Feasibility of Aerobic Granular Sludge Formation in Continuous Flow Reactor Based on Two-zone Sedimentation Tank
- Keywords:
- aerobic granular sludge; continuous flow; two-zone sedimentation tank; radial sedimentation tank; selection pressure
- 摘要:
- 选取一座已初步形成好氧颗粒污泥的工业污水处理厂的辐流式沉淀池为研究对象，结合实际运行情况建立固液二相流模型，分析沉淀池内活性污泥的沉降性能和分布规律。从沉淀池底径向距离中心1、6和12 m处取得3个污泥样本S1、 S2和S3，其中S1的平均粒径（294.6 μm）远高于S2（142.8 μm）和S3（55.2 μm），对应的污泥指数（SVI）分别为56.2、63.4和81.3 mL/g。综合试验结果和计算流体力学(CFD)模拟结果可以发现，沉淀池内颗粒污泥主要集中在半径为1~6 m的圆环区域内。因此，可以通过选择性回流中心区域内的颗粒污泥来制造选择压，从而实现连续流工艺的污泥颗粒化。
- Abstract:
- A radial sedimentation tank from a full-scale industrial sewage treatment plant which has formed the primary aerobic granular sludge (AGS), was used to investigate the settling performance and distribution of the activated sludge in a solid-liquid two-phase flow system using computational fluid dynamics (CFD) model. Three sludge samples (S1, S2 and S3) were taken from the bottom of the sedimentation tank at the different radial distances (1 m, 6 m and 12 m, respectively) from the center of the tank. The average particle size of S1 sludge (294.6 μm) was higher than that of S2 sludge (142.8 μm) and S3 sludge (55.2 μm), while the corresponding sludge volume index for three sludge samples were 56.2 mL/g, 63.4 mL/g and 81.3 mL/g, respectively. Both CFD simulation and experimental data showed that the ring area with a radius of 1-6 m in sedimentation tank contributed to the retention of heavier and larger granular sludge. Therefore, the selection pressure could be generated by selective recirculation of the granular sludge in the center area of the sedimentation tank to enhance the aerobic granulation in the continuous flow reactor.
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