Analyse des mécanismes physico-chimiques et biochimiques en vue d'optimiser le traitement biologique aérobie des résidus lipidiques PDF Download
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Author: Xavier Lefebvre
Publisher:
ISBN:
Category :
Languages : fr
Pages : 218
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Book Description
Les résidus lipidiques sont des rejets très concentrés, traités par des bioréacteurs à alimentation séquentielle. Ces procédés subissent des dysfonctionnements importants et chroniques, liés en particulier à l'apparition de mousse. Nous avons étudié les mécanismes physiques, chimiques et biochimiques inhérents à la dégradation de ces résidus afin de proposer des stratégies de conduite des procédés, fiabilisant le traitement. Majoritairement composées d'acides gras longues chaînes, les graisses de consistance pâteuse vont se répartir aux interfaces eau/air et eau/flocs biologiques. Dans le mode de fonctionnement du procédé industriel (pH 7, Substrat/Micro-organismes (S/X) de l'ordre de 0,1 g/g), plus de 97% des graisses sont adsorbées sur la biomasse et devront se solubiliser par un processus pH?dépendant (pKa = 8) pour être assimilées par les micro-organismes. La cinétique de dégradation est ainsi limitée par la solubilisation de ces graisses et s'apparente à une réaction d'ordre 1 (k = 0,5 j-1, T = 25ʿC). L'étude du moussage en fonction de facteurs déterminants pH, S/X et [graisses]solubles a permis d'identifier deux mécanismes distincts de formation de la mousse qui sont un moussage de type savons et un moussage stabilisé par la biomasse. Le pouvoir moussant et les facteurs déclenchants de ces mousses ont été déterminés, ce qui nous a permis de proposer, à l'aide d'une modélisation adaptée, différentes stratégies opératoires (alimentation continue, conditionnement des graisses) pour assurer un fonctionnement fiable vis-à-vis du moussage (pH
Author: Xavier Lefebvre
Publisher:
ISBN:
Category :
Languages : fr
Pages : 218
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Book Description
Les résidus lipidiques sont des rejets très concentrés, traités par des bioréacteurs à alimentation séquentielle. Ces procédés subissent des dysfonctionnements importants et chroniques, liés en particulier à l'apparition de mousse. Nous avons étudié les mécanismes physiques, chimiques et biochimiques inhérents à la dégradation de ces résidus afin de proposer des stratégies de conduite des procédés, fiabilisant le traitement. Majoritairement composées d'acides gras longues chaînes, les graisses de consistance pâteuse vont se répartir aux interfaces eau/air et eau/flocs biologiques. Dans le mode de fonctionnement du procédé industriel (pH 7, Substrat/Micro-organismes (S/X) de l'ordre de 0,1 g/g), plus de 97% des graisses sont adsorbées sur la biomasse et devront se solubiliser par un processus pH?dépendant (pKa = 8) pour être assimilées par les micro-organismes. La cinétique de dégradation est ainsi limitée par la solubilisation de ces graisses et s'apparente à une réaction d'ordre 1 (k = 0,5 j-1, T = 25ʿC). L'étude du moussage en fonction de facteurs déterminants pH, S/X et [graisses]solubles a permis d'identifier deux mécanismes distincts de formation de la mousse qui sont un moussage de type savons et un moussage stabilisé par la biomasse. Le pouvoir moussant et les facteurs déclenchants de ces mousses ont été déterminés, ce qui nous a permis de proposer, à l'aide d'une modélisation adaptée, différentes stratégies opératoires (alimentation continue, conditionnement des graisses) pour assurer un fonctionnement fiable vis-à-vis du moussage (pH
Author: Linda Strande
Publisher: IWA Publishing
ISBN: 1780404735
Category : Technology & Engineering
Languages : en
Pages : 428
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Book Description
It is estimated that literally billions of residents in urban and peri-urban areas of Africa, Asia, and Latin America are served by onsite sanitation systems (e.g. various types of latrines and septic tanks). Until recently, the management of faecal sludge from these onsite systems has been grossly neglected, partially as a result of them being considered temporary solutions until sewer-based systems could be implemented. However, the perception of onsite or decentralized sanitation technologies for urban areas is gradually changing, and is increasingly being considered as long-term, sustainable options in urban areas, especially in low- and middle-income countries that lack sewer infrastructures. This is the first book dedicated to faecal sludge management. It compiles the current state of knowledge of the rapidly evolving field of faecal sludge management, and presents an integrated approach that includes technology, management, and planning based on Sandecs 20 years of experience in the field. Faecal Sludge Management: Systems Approach for Implementation and Operation addresses the organization of the entire faecal sludge management service chain, from the collection and transport of sludge, and the current state of knowledge of treatment options, to the final end use or disposal of treated sludge. The book also presents important factors to consider when evaluating and upscaling new treatment technology options. The book is designed for undergraduate and graduate students, and engineers and practitioners in the field who have some basic knowledge of environmental and/or wastewater engineering.
Author: S. Roussos
Publisher: Springer Science & Business Media
ISBN: 9401706611
Category : Technology & Engineering
Languages : en
Pages : 641
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Book Description
G.HAINNAUX Departement Milieu et Activites Agricoles, Centre ORSTOM, 911 Avenue d' Agropolis, B.P. 5045, 34032 Montpellier Cedex , France. Solid state fermentation, popularly abbreviated as SSF, is currently investigated by many groups throughout the world. The study of this technique was largely neglected in the past in European and Western countries and there is now a high demand for SSF, meaning in food, environment, agricultural, phannaceutical and many other biotechnological applications. It gives me satisfaction to note that the importance of this technique was realised at my department way back in 1975 since then, our team has put concentrated efforts on developing this technique. xvii Foreword Advances in Solid State Fermentation Foreword M. PUYGRENIER Agropolis Valorisation, Avenue d' Agropolis, 34394 Montpellier Cedex 5, France. On the name of the Scientific Community, I would like to express the wish that this International Symposium on SSF should be successful. Solid State Fermentation is part of biotechnology research. It consists on seeding solid culture medium with bacteria or fungi (filamentous or higher) and on producing, in this medium (solid components and exudates) metabolites and high value products. In fact, this process is very old. In older industries such the food and agricultural, this technique has been extensively used. An example of this is the production of pork sausages and Roquefort cheese. Pharmaceutical industry could make extensive use of SSF in the production of secondary metabolites of many kinds and development in this direction is soon expected.
Author: Osvaldo Jaeggli
Publisher: ISSN
ISBN: 9783112420218
Category : Language Arts & Disciplines
Languages : en
Pages : 0
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Book Description
The architecture of the human language faculty has been one of the main foci of the linguistic research of the last half century. This branch of linguistics, broadly known as Generative Grammar, is concerned with the formulation of explanatory formal accounts of linguistic phenomena with the ulterior goal of gaining insight into the properties of the 'language organ'. The series comprises high quality monographs and collected volumes that address such issues. The topics in this series range from phonology to semantics, from syntax to information structure, from mathematical linguistics to studies of the lexicon. To discuss your book idea or submit a proposal, please contact Birgit Sievert
Author: David M. Robbins
Publisher: IWA Publishing
ISBN: 178040476X
Category : Science
Languages : en
Pages : 148
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Book Description
This is a practical handbook providing a step-by-step approach to the techniques used for characterizing wastewater sources and investigating sites where collection, treatment and reuse/disposal technologies will be installed. It is intended to help enable local implementation of on-site and decentralized wastewater management system (DWMS)for wide scale use in development settings. How to Design Wastewater Systems for Local Conditions in Developing Countries helps local service providers and regulatory officials make informed decisions through the use of tools, checklists and case studies. It includes a link to a web based community of on-site and decentralized wastewater professionals, which contains related tools and case studies. This handbook serves as a reference for training classes, certification programs, and higher education programs in civil and sanitary engineering. There is an increasing interest on the part of local government officials and private sector service providers to implement wastewater treatment systems to solve sanitation problems. The model presented in this handbook promotes activities that first generate data related to source and site conditions that represent critical inputs, and then applies this information to the technology selection process. Matching the most appropriate technologies to the specific needs of the wastewater project is the key that leads to long term sustainability. How to Design Wastewater Systems for Local Conditions in Developing Countries is an invaluable resource for public sector decision makers and private sector service providers in developing countries. It is also a useful text for students at engineering colleges in developing countries interested in taking a class that teaches the methods of decentralized wastewater management system (DWMS) development.
Author: Elizabeth Tilley
Publisher:
ISBN: 9783906484570
Category :
Languages : en
Pages : 176
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Book Description
Author: Ismail Serageldin
Publisher: CABI
ISBN: 9780851996752
Category : Technology & Engineering
Languages : en
Pages : 340
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Book Description
Based on the first scientific conference convened at the Library of Alexandria, 'Biotechnology and Sustainable Development: Voices of the South and North', which was held in Alexandria, Egypt, in March 2002, this book contains overviews of agriculture, health, ethics and the environment. It discusses how dramatic improvements in food security, health, and lifestyle could accrue to the poor people of developing countries through the applications of new technologies.
Author: Rao Y. Surampalli
Publisher: ASCE Publications
ISBN: 9780784407417
Category : Technology & Engineering
Languages : en
Pages : 585
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Book Description
Annotation "Advances in Water and Wastewater Treatment provides state-of-the-art information on the application of innovative technologies for water and wastewater treatment with an emphasis on the scientific principles for pollutant or pathogen removal. Described in detail are the practice and principles of wastewater treatment on topics such as: global warming, sustainable development, nutrient removal, bioplastics production, biosolid digestion and composting, pathogen reduction, metal leaching, secondary clarifiers, surface and subsurface constructed wetland, and wastewater reclamation. Environmental engineers and scientists involved in the practice of environmental engineering will benefit from the basic principles to innovation technologies application."--BOOK JACKET. Title Summary field provided by Blackwell North America, Inc. All Rights Reserved.
Author: R. D. Tyagi
Publisher: Amer Society of Civil Engineers
ISBN: 9780784410516
Category : Technology & Engineering
Languages : en
Pages : 344
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Book Description
Stricter regulations in many countries are increasing interest in sludge management processes which promote sustainability. Engineers and scientists are looking for viable options for resource management through the creation of value added-products from wastewater sludge. The ASCE's Technical Committee on Hazardous, Toxic, and Radioactive Waste Management identified the need to collect and present the latest information on recent trends in the bioconversion of sludge to value-added products like biopesticides, biosurfactants, enzymes, bioplastics, and biofertilizers/bioflocculants. The committee envisioned an easy-to-read book to serve as a reference for practicing professionals and as a textbook in undergraduate or graduate courses. Sustainable Sludge Management: Production of Value-Added Products offers an examination of wastewater sludge characteristics; a road to sustainability by converting sludge into value-added products; and detailed information on the various types of value-added products being created from sludge. This book will be valuable to undergraduate and graduate students in environmental engineering, educators, researchers, practicing engineers and scientists.
Author:
Publisher:
ISBN: 9789240698345
Category : MEDICAL
Languages : en
Pages :
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