Improvement of Suspended Solids Removal Efficiency in Sedimentation Tanks by Increasing Settling Area Using Computational Fluid Dynamics

In the renovation design of sedimentation tanks for the wastewater treatment plant, the small settling velocity particles should be removed to improve total suspended solids (SS) removal efficiency. Theoretically speaking, when the flow rate is constant, the increased settling area in the sedimentat...

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Bibliographic Details
Published in:Journal of Water and Environment Technology 2019, Vol.17(6), pp.420-431
Main Authors: Nguyen, The-Anh, Dao, Nguyet Thi-Minh, Terashima, Mitsuharu, Yasui, Hidenari
Format: Article
Language:English
Subjects:
Area
Computational fluid dynamics
Computer applications
Computer simulation
Configurations
Design optimization
Efficiency
Flow rates
Flow velocity
Fluid dynamics
Hydrodynamics
increased settling area
Lamella
Particulates
Removal
Sedimentation
Sedimentation & deposition
Sedimentation tanks
Settling rate
Settling velocity
small settling velocity particle
Solid suspensions
Suspended particulate matter
Tanks
Total suspended solids
Velocity
Wastewater treatment
Wastewater treatment plants
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Summary:In the renovation design of sedimentation tanks for the wastewater treatment plant, the small settling velocity particles should be removed to improve total suspended solids (SS) removal efficiency. Theoretically speaking, when the flow rate is constant, the increased settling area in the sedimentation tank results in high removal efficiency of small settling velocity particles. Alternatively, the SS removal efficiency increases in lamella settling tank as installing inclined plates. However, the actual effect of increased settling area due to different tank configuration to improve the removal efficiency of small settling velocity particles was not fully investigated. In this study, the computational fluid dynamics model was applied to simulate the effect of increased settling area on SS removal efficiency in three types of configuration when flow rate was remained unchanged. The simulation results show that the highest SS removal efficiency was observed in the tank with increased settling area by extending the length of the tank, in which the increased settling area contributed 69% to improve the removal efficiency of small settling velocity particles. These results have an important role in optimizing the design to enhance the SS removal efficiency of the settling tank.
ISSN:1348-2165
1348-2165
DOI:10.2965/jwet.19-052