Recent Developments on Application of Different Turbulence and Multiphase Models in Sedimentation Tank Modeling—a Review

Raeesh, Mk; Devi, Thiyam Tamphasana; Hirom, Kirpa

doi:10.1007/s11270-022-06007-8

Cited by 9 publications

(3 citation statements)

References 117 publications

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“…In addition to the geometric configuration, the operating conditions (such as dosage of dense media particles, stirring rate, and inlet velocity) of the high-efficiency sedimentation tank also have significant impacts on the tank's overall performance [28].…”

Section: Dosage Of Heavy Medium Particlesmentioning

confidence: 99%

Three-Dimensional Numerical Analysis and Operational Optimization of High-Efficiency Sedimentation Tank

Ye,

Kang,

Wang

et al. 2023

Water

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The high-efficiency sedimentation tank has a wide range of application prospects in industrial wastewater treatment due to its small footprint, strong resistance to shock loads, and high efficiency. However, the complex flow field distribution inside significantly affects the treatment performance of the high-efficiency tank. In this study, a three-dimensional geometric model of the high-efficiency sedimentation tank was constructed based on an engineering prototype. The corresponding solid–liquid two-phase, whole-process computational fluid dynamics (CFD) model for the high-efficiency sedimentation tank was established using the realizable k-ε turbulent model and the multiple reference frame (MRF) method. The internal structures of the flocculation zone, plug-flow zone, and clarification zone were optimized, and then the influence of operational process conditions on the flocculation treatment performance was investigated. The results indicate that, for the given engineering model, the average turbulent kinetic energy k in the flocculation zone exhibits a trend that initially increases and then decreases with the increase in the diameter and height of the draft tube. The optimal hydraulic conditions for the flocculation zone are achieved when the diameter of the draft tube is 2.5 m and the height is 3.5 m. The average turbulent kinetic energy dissipation rate in the plug-flow/clarification zone tends to decrease first and then increase as the height of the water tunnel and water-retaining weir increases. The optimal hydraulic conditions for the plug-flow and clarification zones are achieved when the height of the water tunnel is 1.0 m and the height of the water-retaining weir is 1.6 m. Under optimal operating conditions (dosage of dense media particles: 40 mg/L, stirring rate: 30 rpm, and inlet velocity: 0.72 m/s), satisfactory overall hydraulic conditions can be achieved throughout the entire high-efficiency sedimentation tank. Comparisons between a high-efficiency settling tank and a conventional clarifier for the treatment of circulating water sewage in a practical implementation reveals that the ballasted high-efficiency settling tank has advantages in terms of high hydraulic loading, high removal efficiency of hardness, small footprint, and low doses of flocculant. This research will provide reference values for the design and operation optimization of high-efficiency sedimentation tanks.

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Section: Dosage Of Heavy Medium Particlesmentioning

confidence: 99%

Three-Dimensional Numerical Analysis and Operational Optimization of High-Efficiency Sedimentation Tank

Ye,

Kang,

Wang

et al. 2023

Water

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“…Industrial effluents contain a wide range of pollutants that adversely affect human health when they enter the environment and come into contact with humans through various pathways (in detail in Table 1 ). Traditionally, water treatment has relied on several methods to ensure the purification of water for various applications, such as coagulation/flocculation [ 3 , 4 ], sedimentation [ 5 , 6 ], filtration [ 7 ], disinfection [ 8 ], adsorption [ 9 ], membrane filtration [ 10 , 11 ]. Although these traditional water treatment methods have specific advantages, they also have certain disadvantages.…”

Section: Introductionmentioning

confidence: 99%

Next-Generation Water Treatment: Exploring the Potential of Biopolymer-Based Nanocomposites in Adsorption and Membrane Filtration

Kolya

Kang

2023

Polymers

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This review article focuses on the potential of biopolymer-based nanocomposites incorporating nanoparticles, graphene oxide (GO), carbon nanotubes (CNTs), and nanoclays in adsorption and membrane filtration processes for water treatment. The aim is to explore the effectiveness of these innovative materials in addressing water scarcity and contamination issues. The review highlights the exceptional adsorption capacities and improved membrane performance offered by chitosan, GO, and CNTs, which make them effective in removing heavy metals, organic pollutants, and emerging contaminants from water. It also emphasizes the high surface area and ion exchange capacity of nanoclays, enabling the removal of heavy metals, organic contaminants, and dyes. Integrating magnetic (Fe2O4) adsorbents and membrane filtration technologies is highlighted to enhance adsorption and separation efficiency. The limitations and challenges associated are also discussed. The review concludes by emphasizing the importance of collaboration with industry stakeholders in advancing biopolymer-based nanocomposites for sustainable and comprehensive water treatment solutions.

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“…Different methods were used in the degradation of effluents, such as adsorption (Chai et al 2021 ), coagulation (Zhao et al 2021a , b ), sedimentation (Raeesh et al 2023 ), photocatalysis (Sinar Mashuri et al 2020 ), biodegradation (Wang et al 2023a , b ), and piezocatalysis (Mondal et al 2022 ).…”

Section: Introductionmentioning

confidence: 99%

A comprehensive review on the application of semiconducting materials in the degradation of effluents and water splitting

Mahmoud,

Alsehli,

Alotaibi

et al. 2023

Environ Sci Pollut Res

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In this comprehensive review article, we delve into the critical intersection of environmental science and materials science. The introduction sets the stage by emphasizing the global water shortage crisis and the dire consequences of untreated effluents on ecosystems and human health. As we progress into the second section, we embark on an intricate exploration of piezoelectric and photocatalytic principles, illuminating their significance in wastewater treatment and sustainable energy production. The heart of our review is dedicated to a detailed analysis of the detrimental impacts of effluents on human health, underscoring the urgency of effective treatment methods. We dissected three key materials in the realm of piezo-photocatalysis: ZnO-based materials, BaTiO3-based materials, and bismuth-doped materials. Each material is scrutinized for its unique properties and applications in the removal of pollutants from wastewater, offering a comprehensive understanding of their potential to address this critical issue. Furthermore, our exploration extends to the realm of hydrogen production, where we discuss various types of hydrogen and the role of piezo-photocatalysis in generating clean and sustainable hydrogen. By illuminating the synergistic potential of these advanced materials and technologies, we pave the way for innovative solutions to the pressing challenges of water pollution and renewable energy production. This review article not only serves as a valuable resource for researchers and scholars in the fields of material science and environmental engineering but also underscores the pivotal role of interdisciplinary approaches in addressing complex global issues.

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Recent Developments on Application of Different Turbulence and Multiphase Models in Sedimentation Tank Modeling—a Review

Cited by 9 publications

References 117 publications

Three-Dimensional Numerical Analysis and Operational Optimization of High-Efficiency Sedimentation Tank

Three-Dimensional Numerical Analysis and Operational Optimization of High-Efficiency Sedimentation Tank

Next-Generation Water Treatment: Exploring the Potential of Biopolymer-Based Nanocomposites in Adsorption and Membrane Filtration

A comprehensive review on the application of semiconducting materials in the degradation of effluents and water splitting

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