The optimization on distributions of flow field and suspended solids in a full-scale high-rate clarifier using computational fluid dynamics

Xu, Qi; Xiao, Keke; Wu, Qiongxiang; Wang, Hui; Liang, Sha; Yu, Wenbo; Tao, Siyu; Hou, Huijie; Liu, Bingchuan; Hu, Jingping; Yang, Jiakuan

doi:10.1016/j.bej.2020.107489

Cited by 9 publications

(16 citation statements)

References 46 publications

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“…In order to diagnose and mitigate SO impact on the environment, a recent study recommends a sewer system-treatment plant-receiving natural environment approach (Todeschini et al, 2011). Also, the low treatment efficiency and poor cost-effectiveness of WWTP are due to a lack of optimization of the various processes of WWTP (Xu et al, 2020). Therefore, CFD (computational fluid dynamic) modelling of the WWTP processes is encouraged before constructing future WWTPs to improve treatment efficiency, avoid redesigning costs, and reduce dredging/maintenance costs.…”

Section: Hybrid Method-based Studiesmentioning

confidence: 99%

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Impact of sewer overflow on public health: A comprehensive scientometric analysis and systematic review

Sojobi

Zayed

2022

Environmental Research

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Section: Hybrid Method-based Studiesmentioning

confidence: 99%

“…(Kim et al, 2018;Todeschini et al, 2011) Physical analysis This approach recommends optimizing the design of various processes of WWTP to improve WWT efficiency and hence, minimize residence time and dredging costs. (Xu et al, 2020)…”

Section: Hybrid Method-based Studiesmentioning

confidence: 99%

Impact of sewer overflow on public health: A comprehensive scientometric analysis and systematic review

Sojobi

Zayed

2022

Environmental Research

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“…The three-dimensional (3D) geometry model of the full-scale high-rate clarifier was constructed using the software of Gambit (Gambit 2.4.6, Exceed 13) in Figure 2. The unstructured meshes of tetrahedrons were introduced and the grid of the model was generated by Gambit [41,46]. There were 13,378,966 tetrahedral cells for computed volume.…”

Section: Mathematical Modeling 221 Cfd Modelmentioning

confidence: 99%

“…However, the whole process of solid-liquid two-phase flow simulation in the high-rate clarifier to avoid SS sedimentation has been seldom studied. Xu et al [41] studied hydrodynamics in the mixing zone of the high-rate clarifier. In other words, it is not enough to only study the hydraulic characteristics of the mixing zone because of the sedimentation-targeted of the high-rate clarifier [42,43].…”

Section: Introductionmentioning

confidence: 99%

The Whole Process CFD Numerical Simulation of Flow Field and Suspended Solids Distribution in a Full-Scale High-Rate Clarifier

Luo

et al. 2022

Sustainability

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To further reduce the contents of phosphorus and suspended solids (SS) in the effluent, the high-rate clarifier is adopted by some wastewater treatment plants (WWTPs) to upgrade their processes. However, due to the complex phosphorus species and unclear hydraulic characteristics after the addition of the high-rate clarifier, the removal efficiencies of total phosphorus and the optimization strategies of SS removal remain unclear. The high-rate clarifiers are mainly composed of the mixing zone and the settling zone. Only the hydraulic characteristics of the mixing zone have been studied. It is necessary to focus on the hydrodynamics of the settling zone to understand the sedimentation process and pollutant removal mechanism in depth. Therefore, this study focused on the whole process of high-rate clarifier of the Wuhan Nantaizi Lake WWTP in China. The distributions of flow velocity and SS in the full-scale high-rate clarifier were simultaneously simulated by the solid-liquid two-phase whole process computational fluid dynamics (CFD) model which was established in this study. The simulated results of the developed CFD model were in good agreement with the experimental data obtained in the high-rate clarifier. The normalized standard error was less than 7.66%. The overall flow velocities in the settling tank were much smaller than that in the reaction tank. After the fluid passed through the diversion effect of the overflow wall and the under-through channel, the overall kinetic energy loss was relatively large. Meanwhile, the residence time of fluid in the settling tank was longer than that in the reaction tank. The sludge sedimentation happened at the edge of the settling tank due to the vertical angle between the plug-flow fluid and the outlet. The successful construction of the CFD model could lay the foundation for the next step of the high-rate clarifier optimization operation and research on pollutant removal.

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“…It is of great significance to study the mixing process in the stirred reactor for better control of the reaction process and optimization of the reactor structure. Mixing equipment is widely used in the chemical industry, , medicine, food, mining, papermaking, wastewater treatment, and other fields. − It can be used not only for chemical reactions but also for material mixing, heat transfer, mass transfer, and suspension preparation . The mixing equipment is mainly composed of a shell, mixing device, and heat exchange equipment.…”

Section: Introductionmentioning

confidence: 99%

Study on the Flow Field Characteristics of a Liquid–Solid–Solid Three-Phase System and the Influence of a Draft Tube in a Stirred Reactor

Wang

et al. 2020

Ind. Eng. Chem. Res.

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The liquid−solid−solid three-phase flow field was established in a stirred reactor with a draft tube and baffles. The solid concentration distribution, mixing time, velocity distribution, flow pattern, and power consumption of the flow field were systematically studied by means of a cold model experiment and computational fluid dynamics (CFD) simulation. The CFD model was based on the Euler multiphase flow model and the RNG k−ε turbulence model. Different momentum exchange coefficient models were taken into account for each phase. It was found that at the same stirring speed, the solid distribution was more uniform and the mixing time was less when the draft tube was equipped. The flow pattern of the flow field was more regular and the velocity distribution of the solid phase was more uniform in the reactor with the draft tube. According to the Nagata correlation, a power consumption formula was derived, and its applicability was verified by comparison of the experimental results.

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The optimization on distributions of flow field and suspended solids in a full-scale high-rate clarifier using computational fluid dynamics

Cited by 9 publications

References 46 publications

Impact of sewer overflow on public health: A comprehensive scientometric analysis and systematic review

Impact of sewer overflow on public health: A comprehensive scientometric analysis and systematic review

The Whole Process CFD Numerical Simulation of Flow Field and Suspended Solids Distribution in a Full-Scale High-Rate Clarifier

Study on the Flow Field Characteristics of a Liquid–Solid–Solid Three-Phase System and the Influence of a Draft Tube in a Stirred Reactor

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