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 19):9-15.
Feasibility of Aerobic Granular Sludge Formation in Continuous Flow Reactor Based on Two-zone Sedimentation Tank
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
19 19
Page:
9-15
Column:
Date of publication:
2020-10-01
- Keywords:
- aerobic granular sludge; continuous flow; two-zone sedimentation tank; radial sedimentation tank; selection pressure
- 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.
Last Update:
2020-10-01