Computational fluid dynamics (CFD) modeling applied to biological wastewater treatment systems: An overview of strategies for the kinetics integration

Sadino-Riquelme, M. Constanza; Donoso‐Bravo, Andrés; Zorrilla, Fernando; Valdebenito-Rolack, Emky; Gómez, Daniel; Hansen, Felipe

doi:10.1016/j.cej.2023.143180

Cited by 11 publications

(6 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The rheological behavior of non-Newtonian fluids in biological reactors (such as anaerobic digestors) has been the object of many studies, , which pointed out the dependence of cohesiveness on the solids concentration, pH, and temperature. Some researchers have also modeled these reactors through CFD, not without difficulties especially when including reactions. Nonetheless, the simulation of non-Newtonian sludges in hydrothermal reactors is, thus far, an unexplored task.…”

Section: Resultsmentioning

confidence: 99%

Mixing Due to Natural Convection in a Hydrothermal Reactor: A CFD Study

Marchelli,

Fiori

2024

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The successful design of biomass hydrothermal reactors could be substantially enhanced by computational fluid dynamics (CFD) simulations. However, their performance is still limited by the complexity of the involved physicochemical phenomena and the scarcity of experimental data. This study employs such simulations to analyze the thermo-fluid dynamics of an unstirred batch hydrothermal reactor. By assessing the reactor's response to a lateral heat source, we show that correctly including various phenomena, such as phase transfers and temperature-dependent properties, enables accurate reproduction of natural convection, providing a more solid base for CFD studies on hydrothermal units. The results provide valuable insights into the reactor's inner mixing, which for pure water appears adequate despite the absence of stirring. Additionally, we explore two approaches to include a biomass fixed bed or a non-Newtonian sludge. Discussing future efforts needed to make the simulation of such media more established, we show that their presence may indeed hinder mixing, with implications for the products' quality and safety and for hydrothermal processing control and design.

show abstract

Section: Resultsmentioning

confidence: 99%

Mixing Due to Natural Convection in a Hydrothermal Reactor: A CFD Study

Marchelli,

Fiori

2024

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Simulations can be computationally demanding and require significant computational resources and time [86,87]. Handling large-scale simulations for entire poultry buildings with multiple scenarios can pose computational power and storage capacity challenges.…”

Section: Computational Resource Requirementsmentioning

confidence: 99%

Modeling Environmental Conditions in Poultry Production: Computational Fluid Dynamics Approach

Küçüktopçu,

Cemek,

Simsek

2024

Animals

View full text Add to dashboard Cite

In recent years, computational fluid dynamics (CFD) has become increasingly important and has proven to be an effective method for assessing environmental conditions in poultry houses. CFD offers simplicity, efficiency, and rapidity in assessing and optimizing poultry house environments, thereby fueling greater interest in its application. This article aims to facilitate researchers in their search for relevant CFD studies in poultry housing environmental conditions by providing an in-depth review of the latest advancements in this field. It has been found that CFD has been widely employed to study and analyze various aspects of poultry house ventilation and air quality under the following five main headings: inlet and fan configuration, ventilation system design, air temperature–humidity distribution, airflow distribution, and particle matter and gas emission. The most commonly used turbulence models in poultry buildings are the standard k-ε, renormalization group (RNG) k-ε, and realizable k-ε models. Additionally, this article presents key solutions with a summary and visualization of fundamental approaches employed in addressing path planning problems within the CFD process. Furthermore, potential challenges, such as data acquisition, validation, computational resource requirements, meshing, and the selection of a proper turbulence model, are discussed, and avenues for future research (the integration of machine learning, building information modeling, and feedback control systems with CFD) are explored.

show abstract

“…Considering a hypothetical steady state may also be unrealistic, since the vast majority of HTC reactors are operated in batch mode, due to their research-oriented purposes. An alternative, utilized for slow processes such as wastewater treatment [68], is to decouple the CFD equations from the kinetics and only solve the latter once a fluid dynamic steady state is reached. This would indeed be effective in reducing the simulation time but may not allow the prediction of the interphase mass transfers.…”

Section: Cfd Modelsmentioning

confidence: 99%

Research Needs and Pathways to Advance Hydrothermal Carbonization Technology

Dang,

Cappai,

Chung

et al. 2024

Agronomy

View full text Add to dashboard Cite

Hydrothermal carbonization (HTC) is a proven cost-effective and energy-efficient method for waste management and value-added product recovery. There are, however, several issues that require further improvement or research. Identifying the strengths and weaknesses of HTC in comparison to traditional pyrolysis is crucial for scientists to choose between them or use both (complementary) to achieve specific product properties. Additionally, sharing information on diverse modeling approaches and scales is crucial to enhance the robustness and universality of HTC process models. In addition, the study on the applicability of hydrochars on target applications such as soil amendment is crucial to give back nutrients to soils and face the dependence on finite specific feedstocks in this field. Also, proper management of the process by-products, especially process water, must be addressed to improve the carbon and hydric footprint of the process. Reviewing the suitability of HTC to treat specific challenging wastes, whose strength is not related to their calorific value but to their nutrient composition (i.e., manures), is also an appealing topic for HTC research. This paper aims to tackle the above-mentioned issues through an updated review and discussion of research gaps that require further investigation.

show abstract

Computational fluid dynamics (CFD) modeling applied to biological wastewater treatment systems: An overview of strategies for the kinetics integration

Cited by 11 publications

References 49 publications

Mixing Due to Natural Convection in a Hydrothermal Reactor: A CFD Study

Mixing Due to Natural Convection in a Hydrothermal Reactor: A CFD Study

Modeling Environmental Conditions in Poultry Production: Computational Fluid Dynamics Approach

Research Needs and Pathways to Advance Hydrothermal Carbonization Technology

Contact Info

Product

Resources

About