Download or read book Capture passive du phosphore d une eau us e municipale en contexte de biofiltration written by Gabriel Roy-Dumesnil and published by . This book was released on 2016 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: En concentration excessive, le phosphore rejeté à l'environnement favorise la croissance anormalement rapide de la flore aquatique. Des efforts doivent donc être faits pour développer des traitements qui permettront d'abaisser la concentration des rejets à des valeurs pouvant être aussi basses que 0,3 mgPtot/L. En ce sens, des travaux de recherche ont été réalisés. La méthodologie utilisée est basée sur l'utilisation d'un média filtrant constitué de broyure de bois activée imprégnée d'hydroxyde de fer à sa surface. Des essais en colonne ont été réalisés à partir de ce média filtrant. Opérées en immersion durant plus de 250 jours, des colonnes ont été alimentées avec une eau synthétique dopée en phosphore. Par ces essais, il a été mis en évidence que les colonnes opérées en milieu anaérobie sont plus efficaces que les colonnes opérées en aérobie. L'absence d'oxygène entraine une chute progressive du potentiel d'oxydoréduction. Lorsqu'il atteint des valeurs de l'ordre de -100mV, le fer en surface de la broyure se réduit et passe de la forme Fe3+ à la forme Fe2+. La forme Fe2+ étant plus soluble que la forme Fe3+, il y a donc une augmentation de la concentration en fer dissout. Appelé dissolution réductive, ce phénomène lent permet la complexation du fer solubilisé avec les ions phosphates en solution. C'est la combinaison de l'adsorption et de la complexation du fer qui permet d'obtenir un média performant. Sur une période de 291 jours, la colonne opérée en anaérobie a permis de maintenir à 85% l'enlèvement du phosphore. Puisque le phénomène de dissolution réductive entraine des relargages de fer et de phosphate ferrique à la sortie de la colonne, le contrôle de ces relargages par l'ajout d'une zone aérobie permet une hausse de la performance globale d'enlèvement du phosphore pour un % d'enlèvement global de 95%.
Download or read book Capture passive du phosphore d une eau us e municipale en contexte de biofiltration written by Thomas Thibault and published by . This book was released on 2013 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Capture passive du phosphore d une eau us e municipale en contexte de biofiltration written by Soureyatou Hamidou and published by . This book was released on 2018 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: En quantité excessive, le phosphore est responsable de l’eutrophisation des plans d’eau. De ce fait, les normes de rejet du phosphore des eaux usées municipales font l’objet d’un resserrement. Des travaux ont porté sur la mise au point d’un procédé de capture passive de phosphore caractérisé par des biofiltres dotés de média actif à base de bois imprégné par l’hydroxyde de fer. L’abattement de phosphore se fait par le mécanisme de sorption qui regroupe l’adsorption, la dissolution réductive et les échanges d’ions. Le présent mémoire s’inscrit dans la continuité des travaux sus-cités. L’objectif est d’évaluer l’influence des nitrates sur la performance d’enlèvement du phosphore. Des essais en colonne ont été réalisés à partir d’une broyure activée opérée enanaérobie et par immersion sur une période de 150 jours. Les colonnes ont été alimentées durant 30 jours par une solution synthétique dopée à 5 mg P/L. Différentes concentrations de nitrates (5, 10 et 25 mg N-NO3/L) ont ensuite été appliquées sur trois colonnes (C2, C3 etC4), la colonne C1 servant de témoin.Les résultats ont démontré que l’addition des nitrates réduit les performances d’enlèvement du phosphore des biofiltres. Le suivi du phosphore montre que la concentration en P à la sortie des biofiltres dépasse l’objectif de 0.3 mg P/L, 30 jours après l’injection des nitrates pour la colonne C2 et 15 jours après pour les colonnes C3 et C4. L’ajout des nitrates augmente le potentiel d’oxydoréduction. Il en résulte une inhibition de la dissolution réductive, caractérisée par une baisse de production des ions ferreux. Une dénitrification simultanée se produit au sein des colonnes. Elle est à la fois biologique etchimique à travers l’oxydation des ions ferreux par NO2, produit lors de la dénitrification biologique. Par ailleurs, des tests d’identification bactérienne ont mis en évidence la présence des bactéries reliées au fer, dénitrifiantes, sulfo-oxydantes, réductrices de sulfate,productrices de biofilm ainsi qu’une variété de micro-organismes hétérotrophes tels que les Pseudomonas et les bactéries entériques dans les biofiltres.
Download or read book How to Design Wastewater Systems for Local Conditions in Developing Countries written by David M. Robbins and published by IWA Publishing. This book was released on 2014-03-15 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Methods for Faecal Sludge Analysis written by Konstantina Velkushanova and published by IWA Publishing. This book was released on 2019-03-15 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: The importance and need for faecal sludge management has been recognised worldwide. One major gap in developing appropriate and adequate faecal sludge treatment and monitoring techniques is the ability to understand faecal sludge characteristics, its quantification and correlation to source populations. Faecal sludge characteristics are highly variable, but as standard methods for sampling and analysis do not exist, results are not comparable and hence the actual variability is not yet fully understood. Due to the lack of standard methods for sampling and analysis of faecal sludge, standard methods from other fields such as water, wastewater and soil science are usually applied. However, these methods are not necessarily the most suitable for faecal sludge, and have not been specifically adapted for that purpose. Characteristics of faecal sludge are typically different from these other matrices by orders of magnitude. The methods for faecal sludge sampling are also greatly complicated by the wide range of technologies in each local context, and the heterogeneity within systems. Another gap in existing knowledge is how to quantify faecal sludge on a city-wide scale, or scale relevant for the design of treatment technologies. Moreover, the lack of standardisation complicates the transfer of knowledge and data between different regions and institutions as the results are not comparable. This illustrates the urgent need to establish common methods and procedures for faecal sludge characterisation and quantification. This book aims to address these challenges and provide a basis towards standardized methods for characterisation and quantification of faecal sludge from onsite sanitation technologies, including sampling techniques and health and safety procedures for faecal sludge handling. It also aims at improved communication between sanitation practitioners, comparative faecal sludge database and improved confidence in the methods and obtained results. The book will be beneficial for researchers, laboratory technicians, academics, students and sanitation practitioners.
Download or read book Global Energy and Water Cycles written by K. A. Browning and published by Cambridge University Press. This book was released on 1999-02 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive treatment of models and processes related to water fluxes for meteorologists, hydrologists and oceanographers.
Download or read book Liquid Phase Extraction written by Colin F. Poole and published by Elsevier. This book was released on 2019-08-29 with total page 818 pages. Available in PDF, EPUB and Kindle. Book excerpt: Liquid Phase Extraction thoroughly presents both existing and new techniques in liquid phase extraction. It not only provides all information laboratory scientists need for choosing and utilizing suitable sample preparation procedures for any kind of sample, but also showcases the contemporary uses of sample preparation techniques in the most important industrial and academic project environments, including countercurrent chromatography, pressurized-liquid extraction, single-drop Microextraction, and more. Written by recognized experts in their respective fields, it serves as a one-stop reference for those who need to know which technique to choose for liquid phase extraction. Used in conjunction with a similar release, Solid Phase Extraction, it allows users to master this crucial aspect of sample preparation. Defines the current state-of-the-art in extraction techniques and the methods and procedures for implementing them in laboratory practice Includes extensive referencing that facilitates the identification of key information Aimed at both entry-level scientists and those who want to explore new techniques and methods
Download or read book Biology of Subterranean Fishes written by Eleonora Trajano and published by CRC Press. This book was released on 2010-05-20 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: In most habitats, adaptations are the single most obvious aspects of an organism's phenotype. However, the most obvious feature of many subterranean animals are losses, not adaptations. Even Darwin saw subterranean animals as degenerates: examples of eyelessness and loss of structure in general. For him, the explanation was a straightforward Lamarc
Download or read book Geomicrobiology Molecular and Environmental Perspective written by Alexander Loy and published by Springer Science & Business Media. This book was released on 2010-07-23 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interaction of microorganisms with geological activities results in processes influencing development of the Earth’s geo- and biospheres. In assessing these microbial functions, scientists have explored short- and longterm geological changes attributed to microorganisms and developed new approaches to evaluate the physiology of microbes including microbial interaction with the geological environment. As the field of geomicrobiology developed, it has become highly interdisciplinary and this book provides a review of the recent developments in a cross section of topics including origin of life, microbial-mineral interactions and microbial processes functioning in marine as well as terrestrial environments. A major component of this book addresses molecular techniques to evaluate microbial evolution and assess relationships of microbes in complex, natural c- munities. Recent developments in so-called ‘omics’ technologies, including (meta) genomics and (meta)proteomics, and isotope labeling methods allow new insights into the function of microbial community members and their possible geological impact. While this book summarizes current knowledge in various areas, it also reveals unresolved questions that require future investigations. Information in these chapters enhances our fundamental knowledge of geomicrobiology that contributes to the exploitation of microbial functions in mineral and environmental biotechn- ogy applications. It is our hope that this book will stimulate interest in the general field of geomicrobiology and encourage others to explore microbial processes as applied to the Earth.
Download or read book Mip Synthesis Characteristics and Analytical Application written by and published by Elsevier. This book was released on 2019-08-09 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mip Synthesis, Characteristics and Analytical Application, Volume 86 in the Comprehensive Analytical Chemistry series, highlights advances in the field, with this new volume presenting interesting chapters on synthesis and polymerization techniques of molecularly imprinted polymers, Solid phase extraction technique as a general field of application of molecularly imprinted polymer materials, Advanced artificially receptor- based sorbents for solid phase extraction using molecular imprinting technology: a new trend in food analysis, Application of molecularly imprinted polymers in microextraction and solventless extraction techniques, Magnetic molecularly imprinted microspheres – analytical approach, Surface Imprinted Micro- and Nanoparticles, and much more. Contains a valuable source of information on the wide spectrum of application fields of molecularly imprinted polymers as a green sorption medium Describes the application potential of currently molecular imprinting technologies, associated with the solid phase extraction techniques, magnetic imprinted microspheres, sorbents in mass spectrometry, and imprinted polymer electrochemical sensors
Download or read book Water and Sustainable Development written by Peter Michael Schmitz and published by Peter Lang Pub Incorporated. This book was released on 2005 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: On the occasion of awarding the Developing Countries Prize 2004.
Download or read book Environmental Biotechnology written by S. V. S. Rana and published by . This book was released on 2009 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: 1. An Introduction to Environmental Science 2. Environmental Pollution 3. Global Environmental Problems 4. Fundamentals of Biotechnology 5. Biotechnological Processes 6. Essentials of Genetic Engineering (Recombinant DNA Technology) 7. Cell and Tissue Culture 8. Energy and Biofuels 9. Biofertilizers, Biopesticides and Integrated Pest Management 10. Bioremediation and Phytoremediation 11. Bioabsorption and Bioleaching of Heavy Metals 12. Wastewater Treatment 13. Solid Waste Pollution and Its Management 14. Biomedical Waste Management 15. Biodegradation of Pollutants by Microorganisms 16. Biodegradation of Pollutants by Fungi 17. Biotransformation 18. Biodiversity and Biotechnology 19. Transgenic Animals and Plants 20. Ecogenomics 21. Bioprospecting Subject Index
Download or read book Red Algae in the Genomic Age written by Joseph Seckbach and published by Springer. This book was released on 2012-10-13 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: r ed Algae in Genome Age book most people reading this book have childhood memories about being enthralled at the beach with those rare and mysterious living forms we knew as seaweeds. We were fascinated at that time by their range of red hues and textures, and most of all, their exotic beauty. t o a scientist, red algae represent much more than apparent features. t heir complex forms have attracted morphologists for centuries; their intricate life cycles have brought more than one surprise to plant biologists familiar only with ferns and fowering plants; their unusual tastes have been appreciated for mill- nia, and their valuable chemical constituents have been exploited for nearly as long, most recently by biotech companies; their diversity in marine, freshwater, and t- restrial environments has offered centuries of engaging entertainment for botanists eager to arrange them in orderly classifcation systems; still, the red algae continue to teach us how many more challenges need to be overcome in order to understand their biodiversity, biological functions, and evolutionary histories.
Download or read book Dynamics and Control of Underactuated Multibody Spacecraft written by Sangbum Cho and published by . This book was released on 2002 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Filtering for Some Stochastic Processes with Discrete Observations written by Oleg V. Makhnin and published by . This book was released on 2002 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On Propagating Instabilities in Nickel titanium Steel Alloys written by Mark Anthony Iadicola and published by . This book was released on 2002 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Guidance Strategies for Microburst Escape written by Atilla Dogan and published by . This book was released on 2000 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
