Download or read book CFD Modelling for Wastewater Treatment Processes written by Julien Laurent and published by IWA Publishing. This book was released on 2022-06-15 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Scientific and Technical Report (STR) provides in-depth fundamentals and guidelines regarding Computational Fluid Dynamics (CFD) simulations of Water Resources Recovery Facilities (WRRFs) unit processes (e.g. headworks, aerobic and anaerobic biological reactors, settling tanks, disinfection). Each unit process is described with respect to: Literature review and process description Relevant CFD concepts and modelling approach Case studies Future research needs CFD Modelling for Wastewater Treatment Processes also opens the discussion on two fundamental topics: experimental validation of CFD simulations, and the complementarity between CFD and Chemical Reaction Engineering approaches. This book is intended for undergraduate and graduate students majoring in fields related to wastewater treatment and/or fluid mechanics, as well as researchers and engineers who conduct research and practices in modelling such unit processes. Water resource recovery modelling is not just about lab-scale processes. Now and in the future, it is about improving our understanding of (and designing better) full-scale facilities!

Download or read book Computational Fluid Dynamics written by Xiaofeng Liu and published by . This book was released on 2019-05-16 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an introduction, overview, and specific examples of computational fluid dynamics and their applications in the water, wastewater, and stormwater industry.

Download or read book Hydrodynamic Design and Assessment of Water and Wastewater Treatment Units written by Edmilson Costa Teixeira and published by CRC Press. This book was released on 2019-01-31 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: Water and wastewater treatment normally take place in a series of continuous flow units, each designed to perform a step of the intended purification process - typically involving coagulation or flocculation, sedimentation or filtration, and disinfection. The flow pattern governs the residence/contact time, turbulence levels, collisions and shear to which different fluid portions are subjected in their passage through the unit. The efficiency of a given unit depends as much on the relevant physical, chemical or biological reaction as on the flow pattern taking place inside. This combined effect of flow features on process efficiency is often overlooked in teaching the design of water and wastewater treatment units, and so it is not uncommon to find treatment units in operating in a cost-ineffective way, causing health and environmental problems. This book introduces engineering students to concepts and practical measures associated with the rational design of treatment units, leading to more realistic and potentially optimal solutions for new units as well as for retrofitting existing units. Key basic concepts and suitable analytical tools are described, illustrated and worked through using practical examples. Engineering undergraduates and graduates should benefit from the book while undertaking standalone modules on the topic and/or supplementary classes of existing courses on unit treatment processes. The book may also be useful for technical and engineering staff involved in designing and/or retrofitting units for better cost-effectiveness and footprint reduction of the water and wastewater treatment sector.

Download or read book Computational Fluid Dynamics in Drinking Water Treatment written by Bas Wols and published by IWA Publishing. This book was released on 2011-10-20 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: Special Offer: KWR Drinking Water Treatment Set - Buy all five books together and save £119! Computational Fluid Dynamics (CFD) uses advanced numerical models to predict flow, mixing and (bio)-chemical reactions. In drinking water engineering, CFD is increasingly applied to predict the performance of treatment installations and to optimise these installations. A lack of understanding of the hydraulics in drinking water treatment systems has resulted in suboptimal design of installations. The formation of unwanted disinfection-by-products and the energy consumption or use of chemicals is therefore higher than necessary. The aim of this work is to better understand the hydraulic and (bio)-chemical processes in drinking water treatment installations using experimental and numerical techniques. By combining these techniques, CFD modelling is further developed as a tool to evaluate the performance of these installations. This leads to new insights in the applicability of models in ozone and UV systems, and new insights in design concepts of these systems. CFD modelling proves to be a powerful tool to understand the hydrodynamic and (bio)-chemical processes in drinking water systems. If applied properly, accounting for the complex turbulent motions and validated by experiments, this tool leads to a better design of UV reactors, ozone systems and other systems dictated by hydraulics.

Download or read book Development of Computational Fluid Dynamics Based Artificial Neural Network Metamodels for Wastewater Disinfection written by Wangshu Wei and published by . This book was released on 2018 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mechanisms of the mixing of two streams are investigated numerically. The transport processes of both mass and heat transfer in the mixing of either two gases or two miscible liquids are studied with 3-D time-dependent computational fluid dynamics (CFD) simulations. The flow fields are calculated for the T-junction (of two circular cross-section pipes that meet orthogonally at a junction) which is one of the most common mixing devices in the study of mass and heat transfer. For turbulent flow regimes, the large eddy simulation (LES) technique is employed. Second-order differencing scheme is applied in the simulation to minimize numerical diffusion. The results obtained by the numerical simulations are verified with available experimental data in the literature for air-methane mixing in a T-junction. In the wastewater disinfection process, Peracetic acid (PAA) is an effective anti-microbial agent for disinfection and has a significant applicability in wastewater treatment processes. Similar to other chemical disinfection technologies, such as chlorination, and ozonation, the performance of PAA is determined by hydraulics of a disinfection contactor, chemical kinetics of microbial inactivation, and specific water characteristics. On-site physical modelling on pilot scale has been an important and usual method to validate the kinetics and the performance for a particular system. However, physical modelling is expensive and time consuming. CFD technique offers an alternative to physical modelling. With increasing computational power on personal computers (PCs), applying CFD simulation on a full-scale reactor is becoming more and more achievable. With proven accuracy on predicting the performance of full scale facilities, CFD is now playing a significant role in the wastewater treatment industry. A transient CFD simulation of a full-scale contactor with reasonable accuracy can be achieved within hours on PCs, which significantly lower the cost of undertaking physical modelling experiments. Metamodels based on artificial neural network (ANN) are computationally efficient mathematical approximations to a highly complex system with multiple non-linear features. With a parametric study of CFD simulations providing training dataset, the metamodel is able to be calibrated to predict the performance of a variety contactors with different geometries, inlet conditions and chemical kinetics. In this thesis, the results of microorganism inactivation and PAA decay in full scale contactors using three-dimensional CFD models are presented. Then the results of the simulations were applied to develop ANN-based metamodels. The performance of metamodels were validated with both CFD simulations and pilot scale experiments.

Download or read book Frontiers in Wastewater Treatment and Modelling written by Giorgio Mannina and published by Springer. This book was released on 2017-05-04 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the latest research advances, innovations, and applications in the field of water management and environmental engineering as presented by leading researchers, engineers, life scientists and practitioners from around the world at the Frontiers International Conference on Wastewater Treatment (FICWTM), held in Palermo, Italy in May 2017. The topics covered are highly diverse and include the physical processes of mixing and dispersion, biological developments and mathematical modeling, such as computational fluid dynamics in wastewater, MBBR and hybrid systems, membrane bioreactors, anaerobic digestion, reduction of greenhouse gases from wastewater treatment plants, and energy optimization. The contributions amply demonstrate that the application of cost-effective technologies for waste treatment and control is urgently needed so as to implement appropriate regulatory measures that ensure pollution prevention and remediation, safeguard public health, and preserve the environment. The contributions were selected by means of a rigorous peer-review process and highlight many exciting ideas that will spur novel research directions and foster multidisciplinary collaboration among different water specialists.

Download or read book Computational Fluid Dynamics Applications in Bio and Biomedical Processes written by Satya Eswari Jujjavarapu and published by Springer Nature. This book was released on 2024-01-17 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers emerging areas in novel design and their hydrodynamic properties relevant to bioreactors, environmental system, electrochemical systems, food processing and biomedical engineering. This book uses an interdisciplinary approach to provide a comprehensive prospective simulation modeling and hydrodynamic study in advanced biotechnological process and includes reviews of the most recent state of art in modeling and simulation of flows in biological process, such as CFD. Written by internationally recognized researchers in the field, each chapter provides a strong introductory section that is useful to both readers currently in the field and readers interested in learning more about these areas.

Download or read book CFD Modeling and Simulation in Materials Processing 2016 written by Lifeng Zhang and published by John Wiley & Sons. This book was released on 2016-02-08 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection explores computational fluid dynamics (CFD) modeling and simulation of engineering processes, with contributions from researchers and engineers involved in the modeling of multiscale and multiphase phenomena in material processing systems. The papers cover the following processes: Iron and Steelmaking (Tundish, Casting, Converter, Blast Furnace); Microstructure Evolution; Casting with External Field Interaction; and Smelting, Degassing, Ladle Processing, Mechanical Mixing, and Ingot Casting. The collection also covers applications of CFD to engineering processes, and demonstrates how CFD can help scientists and engineers to better understand the fundamentals of engineering processes.

Download or read book Advances in Wastewater Treatment written by Giorgio Mannina and published by . This book was released on 2018 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Emerging Areas in Bioengineering written by Ho Nam Chang and published by John Wiley & Sons. This book was released on 2018-03-12 with total page 898 pages. Available in PDF, EPUB and Kindle. Book excerpt: With more than 40 contributions from expert authors, this is an extensive overview of all important research topics in the field of bioengineering, including metabolic engineering, biotransformations and biomedical applications. Alongside several chapters dealing with biotransformations and biocatalysis, a whole section is devoted to biofuels and the utilization of biomass. Current perspectives on synthetic biology and metabolic engineering approaches are presented, involving such example organisms as Escherichia coli and Corynebacterium glutamicum, while a further section covers topics in biomedical engineering including drug delivery systems and biopharmaceuticals. The book concludes with chapters on computer-aided bioprocess engineering and systems biology. This is a part of the Advanced Biotechnology book series, covering all pertinent aspects of the field with each volume prepared by eminent scientists who are experts on the topic in question. Invaluable reading for biotechnologists and bioengineers, as well as those working in the chemical and pharmaceutical industries. Advanced Biotechnology Biotechnology is a broad, interdisciplinary field of science, combining biological sciences and relevant engineering disciplines, that is becoming increasingly important as it benefits the environment and society as a whole. Recent years have seen substantial advances in all areas of biotechnology, resulting in the emergence of brand new fields. To reflect this progress, Sang-Yup Lee (KAIST, South Korea), Jens Nielsen (Chalmers University, Sweden), and Gregory Stephanopoulos (MIT, USA) have joined forces as the editors of a new Wiley-VCH book series. Advanced Biotechnology will cover all pertinent aspects of the field and each volume will be prepared by eminent scientists who are experts on the topic in question.

Download or read book Computational Fluid Dynamics written by Jiyuan Tu and published by Butterworth-Heinemann. This book was released on 2012-11-07 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: An introduction to CFD fundamentals and using commercial CFD software to solve engineering problems, designed for the wide variety of engineering students new to CFD, and for practicing engineers learning CFD for the first time. Combining an appropriate level of mathematical background, worked examples, computer screen shots, and step by step processes, this book walks the reader through modeling and computing, as well as interpreting CFD results. The first book in the field aimed at CFD users rather than developers. New to this edition: A more comprehensive coverage of CFD techniques including discretisation via finite element and spectral element as well as finite difference and finite volume methods and multigrid method. Coverage of different approaches to CFD grid generation in order to closely match how CFD meshing is being used in industry. Additional coverage of high-pressure fluid dynamics and meshless approach to provide a broader overview of the application areas where CFD can be used. 20% new content .

Download or read book Biological Wastewater Treatment Principles Modeling and Design written by Guang-Hao Chen and published by IWA Publishing. This book was released on 2020-07-15 with total page 867 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first edition of this book was published in 2008 and it went on to become IWA Publishing’s bestseller. Clearly there was a need for it because over the twenty years prior to 2008, the knowledge and understanding of wastewater treatment had advanced extensively and moved away from empirically-based approaches to a fundamental first-principles approach based on chemistry, microbiology, physical and bioprocess engineering, mathematics and modelling. However the quantity, complexity and diversity of these new developments was overwhelming for young water professionals, particularly in developing countries without readily available access to advanced-level tertiary education courses in wastewater treatment. For a whole new generation of young scientists and engineers entering the wastewater treatment profession, this book assembled and integrated the postgraduate course material of a dozen or so professors from research groups around the world who have made significant contributions to the advances in wastewater treatment. This material had matured to the degree that it had been codified into mathematical models for simulation with computers. The first edition of the book offered, that upon completion of an in-depth study of its contents, the modern approach of modelling and simulation in wastewater treatment plant design and operation could be embraced with deeper insight, advanced knowledge and greater confidence, be it activated sludge, biological nitrogen and phosphorus removal, secondary settling tanks, or biofilm systems. However, the advances and developments in wastewater treatment have accelerated over the past 12 years since publication of the first edition. While all the chapters of the first edition have been updated to accommodate these advances and developments, some, such as granular sludge, membrane bioreactors, sulphur conversion-based bioprocesses and biofilm reactors which were new in 2008, have matured into new industry approaches and are also now included in this second edition. The target readership of this second edition remains the young water professionals, who will still be active in the field of protecting our precious water resources long after the aging professors who are leading some of these advances have retired. The authors, all still active in the field, are aware that cleaning dirty water has become more complex but that it is even more urgent now than 12 years ago, and offer this second edition to help the young water professionals engage with the scientific and bioprocess engineering principles of wastewater treatment science and technology with deeper insight, advanced knowledge and greater confidence built on stronger competence.

Download or read book Computational Fluid Dynamics CFD of Chemical Processes written by Young-Il Lim and published by MDPI. This book was released on 2021-02-22 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this Special Issue, one review paper highlights the necessity of multiscale CFD, coupling micro- and macro-scales, for exchanging information at the interface of the two scales. Four research papers investigate the hydrodynamics, heat transfer, and chemical reactions of various processes using Eulerian CFD modeling. CFD models are attractive for industrial applications. However, substantial efforts in physical modeling and numerical implementation are still required before their widespread implementation.

Download or read book Computational Fluid Dynamics Modeling of Secondary Settling Tank written by HAIWEN GAO and published by . This book was released on 2019 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: Secondary settling tanks (SSTs) are a very crucial process that determines the performance of the activated sludge process (ASP). Due to the importance of its performance, computational fluid dynamics (CFD) models have been employed for the designing new SSTs, the modifying the geometries of existing SSTs and improving control techniques in wastewater treatment plants. However, the practical application of SST CFD models remains challenges due to several difficulties, such as the uncertainty of model structures and the accuracy of different sub-models. To facilitate the practical application of CFD SST models, this dissertation focuses on the numerical analysis of SST models, including the evaluation of different turbulence sub-models and investigation the impact of different parameters in modeling structures and the application of CFD models on the design and operation of SSTs, including improving the understanding the effects of different operation parameters, and surface wind conditions on the performance of SSTs. To improve the understanding of CFD modeling of SSTs, this dissertation provides a comprehensive literature review of different multiphase approaches and the widely applied single-phase approach to model the motion of the particle in SSTs. The literature review also provides a thorough introduction of current CFD research and engineering practice, focusing on the formation and the effect of density currents, effects of different design variables, parameter uncertainties in modeling structures and atmospheric conditions. Also, the widely applied standard k- (SKE) turbulence sub-model is investigated with two more advanced turbulence models (RNG k- and Realizable k- models). The results show that turbulence sub-model selection has a strong influence on the prediction of hydrodynamics of an SST, especially inside the inlet zone, and on the prediction of flow capacity. Moreover, due to the inconsistency of coupling or decoupling the buoyancy-term in the turbulence model structure among different studies as well as the discrepancies observed in other modeling structures, including in the sludge transport model, sludge settling model, dry solids density and different inlet turbulence boundary conditions, their impact on the prediction accuracy of an SST are all investigated. This dissertation also investigates CFD applications on the design and operation of SSTs, including improving the understanding of the effects of different operation parameters, and surface wind conditions on the performance of SSTs. The effects of different operation parameters, such as surface overflow rate (SOR), sludge loading rate (SLR), the concentration of mixed liquid suspended solids (MLSS), and returned activated sludge (RAS) concentration, are firstly evaluated with professor McCorquodale's Quasi-3D SST model. Next, the operational strategy to these operating parameters is investigated with Ansys Fluent-based model in order to maximize the SST capacity. The maximum capacity predicted by the Fluent-based CFD model is then compared with the prediction of one-dimensional idealized flux theory (1DFT) model. Also, the performance of the McKinney baffle on the SST performance is evaluated and shows significant improvement on the SST performance. Finally, instead of focusing on the influential factors inside SSTs, the effects of wind on the performance of both circular and rectangular SSTs are studied. Due to the strong negative impact of wind on the SST performance, the prediction results suggest that in strong windy climates covering SSTs or protecting them from strong winds may be justified.

Download or read book Dynamical Modelling Estimation in Wastewater Treatment Processes written by D. Dochain and published by IWA Publishing. This book was released on 2001-12-01 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Environmental quality is becoming an increasing concern in our society. In that context, waste and wastewater treatment, and more specifically biological wastewater treatment processes play an important role. In this book, we concentrate on the mathematical modelling of these processes. The main purpose is to provide the increasing number of professionals who are using models to design, optimise and control wastewater treatment processes with the necessary background for their activities of model building, selection and calibration. The book deals specifically with dynamic models because they allow us to describe the behaviour of treatment plants under the highly dynamic conditions that we want them to operate (e.g. Sequencing Batch Reactors) or we have to operate them (e.g. storm conditions, spills). Further extension is provided to new reactor systems for which partial differential equation descriptions are necessary to account for their distributed parameter nature (e.g. settlers, fixed bed reactors). The model building exercise is introduced as a step-wise activity that, in this book, starts from mass balancing principles. In many cases, different hypotheses and their corresponding models can be proposed for a particular process. It is therefore essential to be able to select from these candidate models in an objective manner. To this end, structure characterisation methods are introduced. Important sections of the book deal with the collection of high quality data using optimal experimental design, parameter estimation techniques for calibration and the on-line use of models in state and parameter estimators. Contents Dynamical Modelling Dynamical Mass Balance Model Building and Analysis Structure Characterisation (SC) Structural Identifiability Practical Identifiability and Optimal Experiment Design for Parameter Estimation (OED/PE) Estimation of Model Parameters Recursive State and Parameter Estimation Glossary Nomenclature

Download or read book CFD Modeling of Complex Chemical Processes written by Li Xi and published by MDPI. This book was released on 2021-09-01 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computational fluid dynamics (CFD), which uses numerical analysis to predict and model complex flow behaviors and transport processes, has become a mainstream tool in engineering process research and development. Complex chemical processes often involve coupling between dynamics at vastly different length and time scales, as well as coupling of different physical models. The multiscale and multiphysics nature of those problems calls for delicate modeling approaches. This book showcases recent contributions in this field, from the development of modeling methodology to its application in supporting the design, development, and optimization of engineering processes.

Download or read book Secondary Settling Tanks written by G. A. Ekama and published by International Water Assn. This book was released on 1997-01-01 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: The secondary settling tank (SST) plays a major ro