Download or read book Dynamics and Simulation of a Biological Fluidized Bed Reactor written by David K. Stevens and published by . This book was released on 1982 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: Getting consistently high efficiency for biological nitrification during cold weather is an important problem that was stuided by operating and modeling a fluidized bed pilot plant. The pilot plant experiments, including some step change and impulse dynamic tests were encouraging, and a model has been used successfully to fit both steady-state and dynamic performance data. The calibration runs indicated that the kinetic model, which includes rate limitations from several substrates and intraparticle diffusion, adequately describes the rate of substrate flux into the bioparticles. Alkalinity, pH, and nitrate data give good verification of the steady state prediction. The values of parameters used to fit the experimental data seem typical and their trends with time can be qualitatively explained. The parameters obtained in the steady state runs were used to successfully simulate the dynamic experiments. The results of these dynamic experiments lend general validity to the theoretical approach and provide a basis for further work to eliminate the uncertainty incorporated in the fitting parameters.
Download or read book Biological Reaction Engineering written by Elmar Heinzle and published by John Wiley & Sons. This book was released on 2021-07-06 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: This practical book presents the modeling of dynamic biological engineering processes in a readily comprehensible manner, using the unique combination of simplified fundamental theory and direct hands-on computer simulation. The mathematics is kept to a minimum, and yet the 60 examples illustrate almost every aspect of biological engineering science, with each one described in detail, including the model equations. The programs are written in the modern user-friendly simulation language Berkeley Madonna, which can be run on both Windows PC and Power-Macintosh computers. Madonna solves models comprising many ordinary differential equations using very simple programming, including arrays. It is so powerful that the model parameters may be defined as "sliders", which allow the effect of their change on the model behavior to be seen almost immediately. Data may be included for curve fitting, and sensitivity or multiple runs may be performed. The results can be viewed simultaneously on multiple-graph windows or by using overlays. The examples can be varied to fit any real situation, and the suggested exercises provide practical guidance. The extensive teaching experience of the authors is reflected in this well-balanced presentation, which is suitable for the teacher, student, biochemist or the engineer.
Download or read book Dynamics of Nitrification in a Biological Fluidized Bed Reactor written by Slawomir Witold Hermanowics and published by . This book was released on 1982 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Fluid Dynamics of Fluidized Bed Reactors written by Srdjan Sasic and published by . This book was released on 2005 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bioreactor Modeling written by Jerome Morchain and published by Elsevier. This book was released on 2017-10-06 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic simulation of bioreactors is a challenge for both the industrial and academic worlds. Beyond the large number of physical and biological phenomena to be considered and the wide range of scales involved, the central difficulty lies in the need to account for the dynamic behavior of suspended microorganisms. In the case of chemical reactors, knowledge of the thermodynamic equilibrium laws at the interfaces makes it possible to produce macroscopic models by integrating local laws. Microorganisms, on the other hand, have the ability to modulate the rate of substrate assimilation. Moreover, the nature of the biochemical transformations results from a compromise between the needs of the cell and the available resources. This book revisits the modeling of bioreactors using a multi-scale approach. It addresses issues related to mixing, phase-to-phase transfers and the adaptation of microorganisms to variations in concentration, and explores the use of population balances for the simulation of bioreactors. By adopting a multidisciplinary perspective that draws on process engineering, fluid mechanics and microbiology, this book sheds new light on the particularity of bioprocesses in relation to physical and chemical phenomena. Presents a multiphase description of bioreactor modeling Includes a combination of concepts issued from different scientific fields to address a practical issue Provides a detailed description of the population balance concept as applied to biological systems Covers a set of illustrative examples of the interaction between hydrodynamics and biological response
Download or read book Fluidized Bed Reactors Processes and Operating Conditions written by John G. Yates and published by Springer. This book was released on 2016-09-27 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fluidized-bed reactor is the centerpiece of industrial fluidization processes. This book focuses on the design and operation of fluidized beds in many different industrial processes, emphasizing the rationale for choosing fluidized beds for each particular process. The book starts with a brief history of fluidization from its inception in the 1940’s. The authors present both the fluid dynamics of gas-solid fluidized beds and the extensive experimental studies of operating systems and they set them in the context of operating processes that use fluid-bed reactors. Chemical engineering students and postdocs as well as practicing engineers will find great interest in this book.
Download or read book Computational Fluid Dynamics Simulation of Fluidized Bed Polymerization Reactors written by Rong Fan and published by . This book was released on 2006 with total page 4735 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluidized beds (FB) reactors are widely used in the polymerization industry due to their superior heat- and mass-transfer characteristics. Nevertheless, problems associated with local overheating of polymer particles and excessive agglomeration leading to FB reactors defluidization still persist and limit the range of operating temperatures that can be safely achieved in plant-scale reactors. Many people have been worked on the modeling of FB polymerization reactors, and quite a few models are available in the open literature, such as the well-mixed model developed by McAuley, Talbot, and Harris (1994), the constant bubble size model (Choi and Ray, 1985) and the heterogeneous three phase model (Fernandes and Lona, 2002). Most these research works focus on the kinetic aspects, but from industrial viewpoint, the behavior of FB reactors should be modeled by considering the particle and fluid dynamics in the reactor. Computational fluid dynamics (CFD) is a powerful tool for understanding the effect of fluid dynamics on chemical reactor performance. For single-phase flows, CFD models for turbulent reacting flows are now well understood and routinely applied to investigate complex flows with detailed chemistry. For multiphase flows, the state-of-the-art in CFD models is changing rapidly and it is now possible to predict reasonably well the flow characteristics of gas-solid FB reactors with mono-dispersed, non-cohesive solids. This thesis is organized into seven chapters. In Chapter 2, an overview of fluidized bed polymerization reactors is given, and a simplified two-site kinetic mechanism are discussed. Some basic theories used in our work are given in detail in Chapter 3. First, the governing equations and other constitutive equations for the multi-fluid model are summarized, and the kinetic theory for describing the solid stress tensor is discussed. The detailed derivation of DQMOM for the population balance equation is given as the second section. In this section, monovariate population balance, bivariate population balance, aggregation and breakage equation and DQMOM-Multi-Fluid model are described. In the last section of Chapter 3, numerical methods involved in the multi-fluid model and time-splitting method are presented. Chapter 4 is based on a paper about application of DQMOM to polydisperse gas-solid fluidized beds. Results for a constant aggregation and breakage kernel and a kernel developed from kinetic theory are shown. The effect of the aggregation success factor and the fragment distribution function are investigated. Chapter 5 shows the work on validation of mixing and segregation phenomena in gas-solid fluidized beds with a binary mixture or a continuous size distribution. The simulation results are compared with available experiment data and discrete-particle simulation. Chapter 6 presents the project with Univation Technologies on CFD simulation of a Polyethylene pilot-scale FB reactor, The fluid dynamics, mass/heat transfer and particle size distribution are investigated through CFD simulation and validated with available experimental data. The conclusions of this study and future work are discussed in Chapter 7.
Download or read book Design and Modeling of a Fluidized Bed Reactor Using Computational Fluid Dynamics written by Mark More and published by . This book was released on 2010 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Study of Fluidized Bed Reactor written by Jing-Wen Tzeng and published by . This book was released on 1991 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamic Operating Characteristics of a Coupled Biological Fluidized Bed Reactor System written by Jeffrey Frid Mullin and published by . This book was released on 1987 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Particle Fluid Dynamics Simulations of a Commercial Scale Turbulent Fluidized Bed Reactor written by Paul Zhao and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Essentials of Fluidization Technology written by John R. Grace and published by John Wiley & Sons. This book was released on 2020-06-15 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt: A concise and clear treatment of the fundamentals of fluidization, with a view to its applications in the process and energy industries.
Download or read book Spouted and Spout Fluid Beds written by Norman Epstein and published by Cambridge University Press. This book was released on 2010-12-23 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the pioneering text by Mathur and Epstein over 35 years ago, much of the work on this subject has been extended or superseded, producing an enormous body of scattered literature. This edited volume unifies the subject, pulling material together and underpinning it with fundamental theory to produce the only complete, up-to-date reference on all major areas of spouted bed research and practice. With contributions from internationally renowned research groups, this book guides the reader through new developments, insights and models. The hydrodynamic and reactor models of spouted and spout-fluid beds are examined, as well as such topics as particle segregation, heat and mass transfer, mixing and scale-up. Later chapters focus on drying, particle-coating and energy-related applications based on spouted and spout-fluid beds. This is a valuable resource for chemical and mechanical engineers in research and industry.
Download or read book Advanced Biological Treatment Processes written by Lawrence K. Wang and published by Springer Science & Business Media. This book was released on 2010-03-10 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt: The past 30 years have seen the emergence of a growing desire worldwide that positive actions be taken to restore and protect the environment from the degrading effects of all forms of pollution—air, water, soil, and noise. Because pollution is a direct or indirect consequence of waste, the seemingly idealistic demand for “zero discharge” can be construed as an unrealistic demand for zero waste. However, as long as waste continues to exist, we can only attempt to abate the subsequent pollution by converting it to a less noxious form. Three major questions usually arise when a particular type of pollution has been identi?ed: (1) How serious is the pollution? (2) Is the technology to abate it available? and (3) Do the costs of abatement justify the degree of abatement achieved? This book is one of the volumes of the Handbook of Environmental Engineering series. The principal intention of this series is to help readers formulate answers to the last two questions above. The traditional approach of applying tried-and-true solutions to speci?c pollution problems has been a major contributing factor to the success of environmental en- neering, and has accounted in large measure for the establishment of a “methodology of pollution control. ” However, the realization of the ever-increasing complexity and interrelated nature of current environmental problems renders it imperative that intelligent planning of pollution abatement systems be undertaken.
Download or read book Environmental Biotechnology written by Lawrence K. Wang and published by Springer Science & Business Media. This book was released on 2010-04-05 with total page 989 pages. Available in PDF, EPUB and Kindle. Book excerpt: The past 30 years have seen the emergence of a growing desire worldwide that positive actions be taken to restore and protect the environment from the degrading effects of all forms of pollution – air, water, soil, and noise. Since pollution is a direct or indirect consequence of waste production, the seemingly idealistic demand for “zero discharge” can be construed as an unrealistic demand for zero waste. However, as long as waste continues to exist, we can only attempt to abate the subsequent pollution by converting it to a less noxious form. Three major questions usually arise when a particular type of pollution has been identi ed: (1) How serious is the pollution? (2) Is the technology to abate it available? and (3) Do the costs of abatement justify the degree of abatement achieved? This book is one of the volumes of the Handbook of Environmental Engineering series. The principal intention of this series is to help readers formulate answers to the last two questions above. The traditional approach of applying tried-and-true solutions to speci c pollution problems has been a major contributing factor to the success of environmental engineering, and has accounted in large measure for the establishment of a “methodology of pollution control. ” However, the realization of the ever-increasing complexity and interrelated nature of current environmental problems renders it imperative that intelligent planning of pollution abatement systems be undertaken.
Download or read book Biological Fluidized Bed Reactor written by Renalda Samih El-Samra and published by . This book was released on 1994 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theoretical model describing the various kinetic reactions occurring in a biological fluidized bed reactor is proposed in this study. The model covers both the steady and the unsteady conditions of the process, taking into account the bulk liquid biomass activity, and adopting Rittmann's (1982) shearing model. The model resulted from writing four mass balance equations dealing with the state of the process. The state was defined by: (a) the substrate in bulk liquid medium, (b) the substrate in the biofihn, (c) the suspended microorganisms in the bulk liquid medium, and (d) the microorganisms attached to the solid media. The sensitivity of each of the four state variables to the various biological parameters, and system design variables, were investigated at steady state conditions. The theoretical model was verified by conducting experiments under steady and unsteady state conditions, using a pilot scale fluidized bed reactor treating synthetic wastewater. The experimental data obtained were compared to the predicted values calculated from the proposed theoretical model. The sensitivity analysis performed showed that the main factors affecting the process state variables are: the fluidization velocity, the size of the solid media used, the initial bed porosity, the specific yield, and the maximum rate of substrate utilization. The discrepancy between the steady state experimental data obtained, and the corresponding calculated theoretical values was quite large and significant. However, the discrepancy was much lower in the case of the unsteady state experiments. With further modifications and verifications, the proposed theoretical model can be adopted in comprehensive representation of the biological fluidized bed process.
