Intensifying Activated Sludge Using Media Supported Biofilms
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| Author | : Dwight Houweling |
| Publisher | : CRC Press |
| Total Pages | : 144 |
| Release | : 2019-08-16 |
| Genre | : Technology & Engineering |
| ISBN | : 0429535899 |
Intensifying Activated Sludge Using Media-Supported Biofilms will be of interest to practicing wastewater treatment process designers, along with those seeking more compact and energy-efficient wastewater treatment options. The advantages of Moving Bed Biological Reactor (MBBR)-based hybrid processes are now well-established in practice, leading to their increased use in the field. Membrane Aerated Biofilm Reactor (MABR)-based hybrid processes are much newer and offer further systematic process and energy advantages. This book examines the evolution of hybrid technologies as well as the potential for continued improvement of biological wastewater treatment techniques. Features: Reviews current approaches for intensifying biological wastewater treatment processes and their mechanistic bases. Examines hybrid suspended growth/biofilm-based wastewater treatment processes, including the newly-developed MABR-based processes, and their unique dynamic performance characteristics. Presents a novel method for characterizing the performance and process intensification advantages of hybrid processes. Provides guidance for simulating the performance of hybrid processes, including oxygen transfer in MABR hybrid processes.
| Author | : Marcos Von Sperling |
| Publisher | : IWA Publishing |
| Total Pages | : 337 |
| Release | : 2007-03-30 |
| Genre | : Science |
| ISBN | : 1843391651 |
Activated Sludge and Aerobic Biofilm Reactors is the fifth volume in the series Biological Wastewater Treatment. The first part of the book is devoted to the activated sludge process, covering the removal of organic matter, nitrogen and phosphorus.A detailed analysis of the biological reactor (aeration tank) and the final sedimentation tanks is provided. The second part of the book covers aerobic biofilm reactors, especially trickling filters, rotating biological contractors and submerged aerated biofilters. For all the systems, the book presents in a clear and informative way the main concepts, working principles, expected removal efficiencies, design criteria, design examples, construction aspects and operational guidelines. About the series: The series is based on a highly acclaimed set of best selling textbooks. This international version is comprised by six textbooks giving a state-of-the-art presentation of the science and technology of biological wastewater treatment. Other titles in the series are: Volume 1: Waste Stabilisation Ponds; Volume 2: Basic Principles of Wastewater Treatment; Volume 3: Waste Stabilization Ponds; Volume 4: Anaerobic Reactors; Volume 6: Sludge Treatment and Disposal
| Author | : Valter Tandoi |
| Publisher | : IWA Publishing (International Water Assoc) |
| Total Pages | : 588 |
| Release | : 2002 |
| Genre | : Science |
| ISBN | : |
The microbial complexity and the functions of the biomass present in activated sludge and biofilm systems were the subject matter of the 3rd Conference on Microorganisms in Activated Sludge and Biofilm Processes. Detailed knowledge of the identity, physiology and ecology of the microorganisms involved is central to any attempts to modify the composition of the biomass and hence optimise its performance. The Conference covered a wide range of topics dealing with the microbiology and microbial processes in activated sludge and biofilms, including sessions on newly identified microorganisms, microbial selection mechanisms and biomass storage processes. Many of these papers reported on the use of new molecular biological tools that directly address the population structure, dynamics and function of microbial communities. Other sessions dealt with work solving problems and improving performance in full-scale treatment plants and industrial wastewater treatment processes. From the extensive programme, a full peer review has selected for these proceedings 88 of the very best papers on the following topics: microbial dynamics; filamentous bacteria; polyphosphate and glycogen accumulating microorganisms; biofilm composition and processes; nitrifiers and denitrifiers; storage processes in biomass; biomass characterization; microbiology and biochemistry; full-scale experiences; foaming; industrial wastes. Together they form an unrivalled summary of work by the world?s leading experts to research the microbiological basis of wastewater treatment and improve the design and operation of biological processes. These proceedings are an essential reference for engineers, chemists, microbiologists and plant operators researching or applying activated sludge or biofilm techniques.
| Author | : Nicholas F Gray |
| Publisher | : World Scientific |
| Total Pages | : 626 |
| Release | : 2023-02-27 |
| Genre | : Technology & Engineering |
| ISBN | : 180061389X |
Activated sludge is the most widely used biological wastewater treatment process globally to date, although its high energy demand makes it a major contributor of greenhouse gas emissions. Over recent decades it has been constantly modified and retrofitted to treat ever higher loads or improve effluent standards which have often resulted in even greater carbon emissions. Conventional activated sludge treatment is at a crossroads where new sustainable solutions are required if we are to protect the quality of our rivers and meet net-zero carbon targets.The book details current operation and design with special emphasis on the biological aspects of the process. From the microbial kinetics to the fascinating process of floc formation and development, the book explores the development of our understanding of the process looking at new sustainable designs, including biological nutrient removal and new aeration systems. Sludge separation problems and control options are explained, with a trouble-shooting guide to non-bulking problems. Environmental issues including noise, odor, aerosols, micro-plastics and nanoparticles are all reviewed, as is pathogen removal and the problem of antibiotic resistant genes and bacteria. The development of membrane bioreactors has increased process reliability and effluent quality, while integrated fixed-film activated sludge processes are more efficient and compact. The book concludes by exploring how activated sludge can become more sustainable, for example, by carbon harvesting and byproduct recovery.This interdisciplinary book is essential reading for both engineers and scientists whether training at university or practitioners and consultants in the wastewater industry.Related Link(s)
| Author | : International Specialised Conference on Microorganisms in Activated Sludge and Biofilm Processes (3, 2001, Roma) |
| Publisher | : |
| Total Pages | : 440 |
| Release | : 2002 |
| Genre | : |
| ISBN | : |
| Author | : Jiri Wanner |
| Publisher | : CRC Press |
| Total Pages | : 338 |
| Release | : 2014-07-22 |
| Genre | : Technology & Engineering |
| ISBN | : 1498710816 |
The result of over 25 years of research, this book is a concise guide to the microbiological and technical aspects of bulking and foaming control. It stresses practical control measures based on kinetic and metabolic selection theories and supported by case histories. Topics include: biochemical processes in wastewater treatment, evaluation of separation problems, settling and foaming principles, bulking and foaming control methods, and system design. More than 100 tables and figures illustrate complex processes, and over 500 references provide a detailed compendium of available resources. Cross-references provide background of a problem, its connection to similar problems, and their solutions.
| Author | : G.H. Williams |
| Publisher | : |
| Total Pages | : |
| Release | : 1996 |
| Genre | : |
| ISBN | : |
| Author | : Benjamin Lefebvre |
| Publisher | : |
| Total Pages | : 158 |
| Release | : 2019-02-05 |
| Genre | : |
| ISBN | : 9781536152029 |
In this collection, the authors report on the pretreatment methods for waste activated sludge based on pulsed electric field and corona discharge techniques. The effects of pulse magnitude, frequency, temperature and pretreatment time are demonstrated on the basis of cell membrane electroporation. The influence of voltage polarity, frequency, magnitude, treating time and temperature has also been demonstrated. A description of fundamental techniques in molecular biology for the analysis of the microbiota of activated sludge is provided. Activated sludge is a heterogeneous system of organisms, organic and inorganic material, and therefore giving a specific protocol for each molecular technique would be imprudent. The authors go on to discuss the Monod model, which provides a functional relationship between specific growth rate and substrate concentration in the bulk. Important research efforts dedicated to adequate use of the Monod model are presented, consolidating knowledge from activated sludge and biofilm modelling, identifying misdirections, and setting parameters for further research. In one study, different microwave power outputs and times were optimised for sludge solubilisation without evaporation loss in waste activated sludge from two different sources. The variable effects of pre-treatments on extracellular polymeric substances fraction, cellular oxidative stress and solubilisation of both sludges were evaluated to understand the impact of sludge complexity. The penultimate chapter examines how toxic carbon sources can cause higher residual effluent dissolved organic carbon than easily biodegraded carbon sources in the activated sludge process. Based on the variations of chemical components of activated sludge, mainly intracellular storage materials, extracellular polymeric substances and soluble microbial products, the performance and mechanism of toxic carbon on the activated sludge process can be clarified. The purpose of the final study is to research the supplementation of different concentrations of substrate on the degradation rate of xenobiotics, and to determine the optimal concentrations of auxiliary substrates that are most beneficial. The results show that sugar and peptone can affect 2,4-D degradation rate by several different degrees at different concentrations.
| Author | : Fadi Youssef Gebara |
| Publisher | : |
| Total Pages | : 194 |
| Release | : 1998 |
| Genre | : |
| ISBN | : |
This research project deals with a proposed modification of the conventional activated sludge process which involves placing a set of plastic nets inside the aeration tank. The new system is termed in this report "Activated Sludge Biofilm Wastewater Treatment System (ASBWTS)". Theoretical mathematical models describing the kinetics of the system are proposed. The accuracy of the proposed models has been checked experimentally. The experimental work involved five experimental conditions as defined below : During the first month, the system was operated as a conventional activated sludge system, and the experimental test results were recorded. Four sets of plastic nets were then fitted in a staggered manner in the aeration tank. Each set consisted of 6 nets. Four conditions were thus obtained, in which the aeration tank contained : 6 nets. 12 nets, 18 nets and 24 nets. Each condition was studied for one week and experimental results were recorded. Significant improvements in BOD removal and sludge settling characteristics were observed. Accordingly, the ASBWTS is recommended as a robust and relatively cheap wastewater treatment system.
| Author | : N. F. Gray |
| Publisher | : Oxford University Press, USA |
| Total Pages | : 298 |
| Release | : 1990 |
| Genre | : Language Arts & Disciplines |
| ISBN | : |
Activated sludge is the most widely used biological wastewater treatment process in the world, both for domestic and industrial purposes. This book reviews the major theoretical concepts and practical operational factors, and describes the complexities inherent in the process, which depends on a dense microbial population mixed in wastewater under specific aerobic conditions. It is an ideal reference source for scientists, and a useful troubleshooting guide for practicing engineers and plant operators.
