Author: Erika Varga
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
L'objectif de la thèse est d'analyser les problèmes opérationnels et de modéliser l'élimination des nutriments dans les petites/moyennes installations qui mettent en œuvre une élimination combinée biologique et physico-chimique du phosphore. Le procédé étudié utilise une aération alternée optimisée pour une élimination complète de l'azote par nitrification et dénitrification, un système très représentatif en France. Comme une zone anaérobie est également présente, l'élimination biologique du phosphore est effectuée et combinée avec l'ajout de FeCl3 pour garantir que la qualité des effluents est conforme aux normes de l'UE. Afin de maximiser la fraction biologique de l'élimination du P, les paramètres d'aération et les temps de rétention aérobie/anoxique/anaérobie ont été analysés et optimisés par la programmation d'un système de contrôle automatisé. La libération de P secondaire lors de l'extraction intermittente des boues (et le retour de la liqueur de boue dans la zone anaérobie) a été observée. Une relocalisation du dosage de fer a été proposée du bassin d'aération vers spécifiquement la liqueur de boue avant son retour en tête. Ce changement permet à l'opérateur d'économiser sur les coûts des produits chimiques. Pour évaluer d'autres scénarios, des simulations ont été réalisées avec le logiciel Sumo. La simulation du procédé en fonctionnement régulier a mis en évidence quelques écarts de modélisation propres à ces conditions, à savoir les rejets de phosphore (en bassin non aéré et rejet secondaire lors de la déshydratation) et les transformations redox du Fer dans les boues activées. Plusieurs expériences spécifiques ont été menées pour répondre à ces questions. Comme la récupération du P est une préoccupation émergente (et mal mise en œuvre pour les usines de petite/moyenne taille), il est essentiel d'analyser ces interactions en détail afin de trouver un produit de récupération idéal pour chaque condition. Les boues physico-chimiques, contenant du fer, sont idéales pour la récupération de vivianite, pour laquelle une compréhension approfondie de la réduction du fer est essentielle. Cette thèse présente une étude complète des procédés de réduction du fer dans les boues activées. Avec les résultats des expériences, les observations dans l'installation et la littérature des recherches antérieures, des modifications/extensions au modèle ont été recommandées. Le modèle a été calibré par rapport à de nombreuses données de l'installation avec différentes conditions d'exploitation et des données mesurées à partir d'essais de réacteurs discontinus. Le modèle calibré peut simuler correctement le fonctionnement de l'installation dans différentes conditions et peut également être utilisé pour évaluer différents scénarios de traitement et de récupération.
Author: P. M. J. Janssen
Publisher: IWA Publishing
ISBN: 9781843390121
Category : Science
Languages : en
Pages : 228
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Book Description
Biological phosphorus (bio-P) removal has become a reliable and well-understood process within wastewater treatment, despite being one of the most complex processes in the activated sludge process. Extended fundamental and full-scale research has been carried out into the bio-P process and the state-of-the-art is described in this report. A summarising historical overview gives insight into the establishment of the appropriate microbiological and biochemical basis of the process and the development of bio-P configurations in practice. Aspects of the bio-P process that have a direct influence on the efficiency of phosphorus removal are subjected to an in-depth investigation. This report presents guidelines for design and dimensioning in order to introduce and/or optimise the bio-P process in practice. Twelve bio-P installations are extensively described and the operational results and experiences are related to existing bio-P knowledge and guidelines. Based on a number of parameters, a comparison is made between the described bio-P plants. A steady state model is verified with extensive periods of practical experience of the plants. The bio-P model, which is provided on CD-ROM (available for download here), offers a reliable insight into the bio-P process, coupled with sensitivity analyses regarding wastewater characteristics and process parameters for the anaerobic volume and the P-ortho concentration in the final effluent. The report ends with a systematic approach to the design of the bio-P process, based on the background of the bio-P process itself, much practical experience and the analysis of operational bio-P plants. Also presented is a systematic approach to tackle operational aspects of the bio-P process in order to generate an acceptable low P effluent concentration. This optimisation of the bio-P process operation is supported by a decision diagram. Biological Phosphorus Removal will be an invaluable source of information for all those concerned with wastewater treatment, including plant managers, process designers, consultants and researchers.
Author: Parnian Izadi
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Enhanced Biological Phosphorus Removal (EBPR), as a promising technology, has been implemented in many wastewater treatment plants (WWTP) worldwide, with high efficiency in phosphorus removal performance. In a well-operated EBPR, lower operational cost, reduced sludge production, and lower environmental impacts are achievable. Yet, with the proven capability of EBPR in efficient phosphorus removal, disturbance and periods of unexplained insufficient phosphorus removal have been detected in real WWTP in different cases due to loss of PAO biomass under presumed favorable conditions for EBPR. These complications may lead to process upset, system failure, and violation of discharge regulations. Disruption in process performance may originate from several external factors such as heavy rainfall, excessive nitrate loading to the anaerobic reactor, excessive aeration of activated sludge, or it may be a result of PAOs competition with other groups of microorganisms such as glycogen accumulating organisms (GAO). Therefore, the key in reaching low P-effluent levels is to optimize the operation and minimize the effect of inefficient factors. This Ph.D. study has focused on aeration as a crucial operational factor in the EBPR process in sequential batch reactor (SBR) systems. EBPR aerobic P-uptake, anaerobic P-release, and carbon storage of phosphorus accumulating organisms (PAOs) are closely related to oxygen mass transfer. The study is oriented to different aspects of aeration, addressing aeration concentration (dissolved oxygen (DO) concentration), aeration duration (aerobic hydraulic retention time (HRT)), and aeration pattern (continuous/intermittent). The performance of EBPR in SBRs under various aeration strategies was investigated for different DO concentrations (0.4-4 mg/L), HRT (120-320 minute), and aeration patterns of continuous and intermittent (25 to 50 minute on/off intermittent aeration/non-aeration intervals). Moreover, this study investigated the effect of reaching micro-aeration with adaptation strategies on EBPR performance. The development of steady and instant-DO reduction in different aeration strategies was studied in batch tests with enriched PAOs at different DO levels. Subsequently, comparative modeling using calibrated BioWin software was implemented for SBRs to predict the nutrient removal performance by changing DO concentration and the aerobic-HRT and understanding the effect of parameters on treatment performance to improve operation and control.
Author: RichardI. Sedlak
Publisher: Routledge
ISBN: 1351424939
Category : Technology & Engineering
Languages : en
Pages : 258
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Book Description
This valuable new book offers practical guidance regarding the design and operation of systems for reducing effluent nitrogen and phosphorus. The principles of nitrogen and phosphorus removal are discussed, including sources of nitrogen and phosphorus in wastewater, removal options, nitrogen and phosphorus transformations in treatment, process selection, and treatment. The book also covers the design and operation of nitrogen and phosphorus removal systems, including system options, system design, facility design, facility costs, and operation. Practical case studies are provided as examples of successful system implementations that may be able to help you decide what will work best in your plant.
Author: Richard I. Sedlak
Publisher: CRC Press
ISBN: 9780873716833
Category : Technology & Engineering
Languages : en
Pages : 258
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Book Description
This valuable new book offers practical guidance regarding the design and operation of systems for reducing effluent nitrogen and phosphorus. The principles of nitrogen and phosphorus removal are discussed, including sources of nitrogen and phosphorus in wastewater, removal options, nitrogen and phosphorus transformations in treatment, process selection, and treatment. The book also covers the design and operation of nitrogen and phosphorus removal systems, including system options, system design, facility design, facility costs, and operation. Practical case studies are provided as examples of successful system implementations that may be able to help you decide what will work best in your plant.
Author:
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 772
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Book Description
Author:
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 1344
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Book Description
Author: Oula Khodor Shebab
Publisher:
ISBN:
Category :
Languages : en
Pages : 292
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Book Description
Author: Damir Brdanovic
Publisher: CRC Press
ISBN: 1000657981
Category : Science
Languages : en
Pages : 272
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Book Description
This text looks at different effects on the process of biological phosphorus removal. Topics include: biological phosphorus removal processes; process and molecular ecological studies; and the effect of potassium limitation on biological phosphorus removal.
Author: R. Ramadori
Publisher: Elsevier
ISBN: 1483160599
Category : Technology & Engineering
Languages : en
Pages : 405
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Book Description
Biological Phosphate Removal from Wastewaters contains the proceedings of an International Association on Water Pollution Research and Control Specialized Conference held in Rome, Italy on September 28-30, 1987. Contributors review advances that have been made in the removal of biological phosphates from wastewaters, both at the fundamental scientific level and in the practical application of the process. Topics range from the fundamental microbiology and biochemistry of the enhanced biological removal of phosphate to the practical full-scale plant experiences with phosphorus removal and sludge handling from such processes. This text is comprised of 43 chapters; the first of which describes the utilization of polyphosphate as an energy reserve in Acinetobacter sp. and activated sludge. Attention then turns to metabolic control in polyphosphate-accumulating bacteria and its role in enhancing biological phosphate removal. The biochemistry and energetics of biological phosphorus removal are also considered. The next section is devoted to process modeling and includes chapters that explore the kinetics of biological excess phosphorus removal; factors affecting anaerobic stabilization during biological phosphorus removal; and the behavior of magnesium in biological phosphate removal. In the next section, bench/pilot-scale studies are presented; one of which investigated the reduction of returned phosphorus from a sludge treatment process. The book concludes with a discussion on phosphate removal mechanisms and pilot- and full-scale experiences. This book will be of interest to students, practitioners, and policymakers in water pollution control.
