Download or read book Simulation of Flow Mass Transfer and Bio Chemical Reactions in Anaerobic Digestion written by David Mitchell and published by . This book was released on 2018-12-13 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: Anaerobic digestion (AD) has demonstrated growing importance in practice in recent years. It is a green technology that can extract methane-rich biogas from the biological degradation of regionally abound biomass such as municipal solid wastes and wastewaters. With the development of high rate systems in the period from the 1950s to 1980s the technology was applied to agro-industrial effluents. As the technology matured, increased knowledge on toxicity and biodegradability enabled applications to include effluents containing toxic and recalcitrant compounds from the chemical, petrochemical and pulp/paper industries (Mata-Alvarez et al., 2000). The current designs of the AD systems reflect the need for shorter hydraulic retention times, higher retention of biomass, smaller reactor volume and higher loading rates, indicative of their application in urban locations. The users of the technology benefit by using the biogas produced, reducing odor and the volume of sludge produced, as well as sanitizing the wastes. Germany and Denmark, where environmental legislation concerning waste disposal is stringent, lead the way. Since 2000, there has been almost a 25-fold increase in the annual electricity generation from digester projects in USA, from about 14 million kilowatt-hours (kWh) to an estimated 331 million kWh per year

Download or read book Simulation of Flow Mass Transfer and Bio chemical Reactions in Anaerobic Digestion written by Liang Yu (dd) and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The mechnisim of a high rate digestor was explored by a multi-fluid model with KTGF. The simulation results suggest that the dairy manure particles tend to have soft and deformable fluid properties due to the lower contribution of collisional and kinetic components. The evaluation for biomass retention allowed the determination of the optimum SRT in anaerobic digestion. Aided with CFD simulation, the scale-up effect of the hydrodynamic nature from the bottle reactor to the column reactor was reduced.

Download or read book Anaerobic Digestion Model No 1 ADM1 written by IWA Task Group for Mathematical Modelling of Anaerobic Digestion Processes and published by IWA Publishing. This book was released on 2002-02-01 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: The IWA Task Group for Mathematical Modelling of Anaerobic Digestion Processes was created with the aim to produce a generic model and common platform for dynamic simulations of a variety of anaerobic processes. This book presents the outcome of this undertaking and is the result of four years collaborative work by a number of international experts from various fields of anaerobic process technology. The purpose of this approach is to provide a unified basis for anaerobic digestion modelling. It is hoped this will promote increased application of modelling and simulation as a tool for research, design, operation and optimisation of anaerobic processes worldwide. This model was developed on the basis of the extensive but often disparate work in modelling and simulation of anaerobic digestion systems over the last twenty years. In developing ADM1, the Task Group have tried to establish common nomenclature, units and model structure, consistent with existing anaerobic modelling literature and the popular activated sludge models (See Activated Sludge Models ASM1, ASM2, ASM2d and ASM3, IWA Publishing, 2000, ISBN: 1900222248). As such, it is intended to promote widespread application of simulation from domestic (wastewater and sludge) treatment systems to specialised industrial applications. Outputs from the model include common process variables such gas flow and composition, pH, separate organic acids, and ammonium. The structure has been devised to encourage specific extensions or modifications where required, but still maintain a common platform. During development the model has been successfully tested on a range of systems from full-scale waste sludge digestion to laboratory-scale thermophilic high-rate UASB reactors. The model structure is presented in a readily applicable matrix format for implementation in many available differential equation solvers. It is expected that the model will be available as part of commercial wastewater simulation packages. ADM1 will be a valuable information source for practising engineers working in water treatment (both domestic and industrial) as well as academic researchers and students in Environmental Engineering and Science, Civil and Sanitary Engineering, Biotechnology, and Chemical and Process Engineering departments. Contents Introduction Nomenclature, State Variables and Expressions Biochemical Processes Physicochemical Processes Model Implementation in a Single Stage CSTR Suggested Biochemical Parameter Values, Sensitivity and Estimation Conclusions References Appendix A: Review of Parameters Appendix B: Supplementary Matrix Information Appendix C: Integration with the ASM Appendix D: Estimating Stoichiometric Coefficients for Fermentation Scientific & Technical Report No.13

Download or read book Novel Simulation of Anaerobic Digestion Using Computational Fluid Dynamics written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In an effort to optimize the economy and performance of covered anaerobic reactor systems, a comprehensive dynamic and mechanistic model was created to simulate the constituent processes of full-scale anaerobic digestion. These processes included the following: bulk fluid motion, sedimentation, bubble mixing, bubble entrainment, buoyant mixing, advection, biological reactions, internal heat transfer, and heat exchange with the environment. This model contrasted with conventional models that assumed uniform concentrations and temperature throughout the reacting medium. Novel numerical simulation techniques were developed to simulate the heat and mass transfer resulting from two phase gas-liquid flow and unsteady buoyancy driven flow. The complete model was implemented in a computer code called LagoonSim3D. Three years of performance data from a full-scale covered anaerobic digestion system in central North Carolina were used to quantify unknown parameters as well as validate the LagoonSim3D software. The LagoonSim3D software predicted the temperature of the covered lagoon within 5.7% and the dynamic monthly gas production within 11%. The external convective heat transfer coefficient was found to be a linear function of wind speed. The convective heat transfer coefficient of the gas gap between the cover and the slurry was found to be 10 W/m2K. The average particle settling velocity was found to be 0.02 cm/s. These previously unknown parameters were important for the design of future anaerobic digestion systems. The validated LagoonSim3D model was used to determine the effect of design changes on reactor performance. In part, it was found that the case study system had at least twice the optimal volume, and a nearly optimal depth. It was also found that the performance of the case study system could be improved by cutting the flush water volume in half. It was concluded that the LagoonSim3D software enabled a flexible and general evaluation of covered anaerobic l.

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 Dynamics of Environmental Bioprocesses written by Jonathan B. Snape and published by John Wiley & Sons. This book was released on 2008-07-11 with total page 515 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic environmental processes are complex; the easiest and most effective way to understanding them lies through the disciplines of dynamic modelling and computer simulation. The prerequisite modelling fundamentals are presented in the first chapter in a manner comprehensible to students as well as to practising scientists and engineers. The second chapter describes the many environmental processes that lend themselves to modelling, for example pollution and wastewater treatment. The third part of the book provides 65 simulation examples both on the page and on an accompanying diskette in the simulation language ISIM - the first time that this has been done with a teaching book in this field - ready-to-run on any DOS personal computer. Crucially, the simulation runs can be interrupted to allow rapid interactive parameter changes and easy plotting of results; this enables the reader to get a feel for the model and system behaviour.

Download or read book Computer Games and Simulation for Biochemical Engineering written by Henry R. Bungay and published by Wiley-Interscience. This book was released on 1985-01-18 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Water Resources Research Catalog written by and published by . This book was released on 1966 with total page 1464 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dynamic Modeling and Simulation of the Anaerobic Digestion Process written by John F. Andrews and published by . This book was released on 1970 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Kinetic Modeling and Experimentation of Anaerobic Digestion written by Jonathan E. Rea and published by . This book was released on 2014 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: Anaerobic digesters convert organic waste (agricultural and food waste, animal or human manure, and other organic waste), into energy (in the form of biogas or electricity). An added benefit to bio-digestion is a leftover high-grade organic fertilizer. Models of the anaerobic digestion process do exist, but either rely on simple algebraic equations instead of biochemical reactions, or consider so many external parameters that they become overly complicated and require much input information and computation time. This work provides an intermediate kinetic model that predicts biogas output over time with few inputs. This kinetic model is justified by a small-scale laboratory experiment, and parameters are adjusted to match experimental results. This model can be used to optimize design parameters for an anaerobic digester, and provides information such as the relationship between digester sizing and feed rate. The process used here may be expanded to other feedstock materials and repeated for other similar applications, in an effort to expand anaerobic digestion systems as a clean energy source.

Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 884 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mass Transfer in Biological Systems written by American Institute of Chemical Engineers and published by . This book was released on 1970 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bioenergy Principles and Technologies written by Zhenhong Yuan and published by Walter de Gruyter GmbH & Co KG. This book was released on 2017-12-18 with total page 497 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second part of Bioenergy: Principles and Technologies continues the discussion of biomass energy technologies covering fuel ethanol production, pyrolysis, biomass-based hydrogen production and fuel synthesis, biodiesel, municipal solid water treatment and microbial fuel cells. With a combination of theories, experiments and case studies, it is an essential reference for bioenergy researchers, industrial chemists and chemical engineers.

Download or read book Anaerobic Digestion written by Sevcan Aydin and published by BoD – Books on Demand. This book was released on 2024-02-07 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides comprehensive insights into the biotechnological process of converting organic matter into biogas, which is an essential renewable energy resource for addressing challenges related to fossil fuel depletion and environmental pollution. It includes six chapters that cover a spectrum of topics, including approaches to biogas upgrading, the optimization of biogas production through examination, mathematical modeling, and applied calculations, the application of bacteriophages to enhance anaerobic digestion, and more.

Download or read book Young Researchers 2004 written by Tom Dupuis and published by IWA Publishing. This book was released on 2004-04-30 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: The selection of papers in this special issue of WEMS illustrates the various aspects of water and wastewater treatment and management. These papers were presented at the 2nd Young Researchers Conference held on 23-24 April 2004, at the University of Wageningen, The Netherlands. It was organised on behalf of the International Water Association (IWA) and supported by the European Symposium of Environmental Biotechnology (ESEB 2000). The IWA Young Researcher Conferences' mission is to provide young researchers in water and wastewater science, technology and management with a forum to discuss current and future environmental concerns. The conferences aim to confront environmental researchers with technologists and regulatory instances dealing with environmental quality. Moreover, the IWA Young Researchers Conferences address issues related to the development of careers in the water sector.

Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1990 with total page 1180 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mathematical Modelling and Computer Simulation of Activated Sludge Systems written by Jacek Makinia and published by IWA Publishing. This book was released on 2020-03-02 with total page 682 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mathematical Modelling and Computer Simulation of Activated Sludge Systems – Second Edition provides, from the process engineering perspective, a comprehensive and up-to-date overview regarding various aspects of the mechanistic (“white box”) modelling and simulation of advanced activated sludge systems performing biological nutrient removal. In the new edition of the book, a special focus is given to nitrogen removal and the latest developments in modelling the innovative nitrogen removal processes. Furthermore, a new section on micropollutant removal has been added. The focus of modelling has been shifting in the last years to models that can describe the performance of a whole plant (plant-wide modelling). The expanded part of this new edition introduces models describing the most important processes interrelated with the mainstream activated sludge systems as well as models describing the energy balance, operating costs and environmental impact. The complex process evaluation, including minimization of energy consumption and carbon footprint, is in line with the present and future wastewater treatment goals. By combining a general introduction and a textbook, this book serves both intermediate and more experienced model users, both researchers and practitioners, as a comprehensive guide to modelling and simulation studies. The book can be used as a supplemental material at graduate and post-graduate levels of wastewater engineering/modelling courses.