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Activated Sludge

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Gunnel Dalhammar - One of the best experts on this subject based on the ideXlab platform.

  • thickening of waste Activated Sludge by biological flotation
    Water Research, 1992
    Co-Authors: Simona Ciẑinska, Vit Matěj, Claes Wase, Yvonne Klasson, Jakub Krejci, Gunnel Dalhammar
    Abstract:

    Waste Activated Sludge was thickened by biological flotation without polymer flocculant dosage. The BIOFLOT® process utilizes the denitrifying ability of Activated Sludge bacteria. Gaseous products of anaerobic nitrate reduction cause spontaneous flotation of the Sludge suspended solids. Laboratory tests confirmed the dependence of Sludge thickening efficiency on available nitrate concentration, flotation time and temperature. Full-scale experiments were performed in a fully automatized unit for discontinuous Sludge thickening from wastewater treatment plants with a capacity of up to 5000 I.E. Waste Activated Sludge from wastewater treatment plants at Pisek. Milevsko and Bjornlunda was thickened from 6.2, 10.7 and 3.5 g/l MLSS to 59.4, 59.7 and 66.7 g/t MLSS, respectively. Concentrations of COD, ammonium and phosphate ions were decreased in Sludge water. The average nitrate consumption for bioflotation was 21.2 mg NO1− per 1 g of MLSS of Activated Sludge. Flotation time ranged from 4 to 48 h.

Takashi Mino - One of the best experts on this subject based on the ideXlab platform.

  • Biopolymers Online - Production of Polyhydroxyalkanoates from Activated Sludge
    Biopolymers Online, 2002
    Co-Authors: Hiroyasu Satoh, Takashi Mino
    Abstract:

    Introduction Activated Sludge Processes Historical Outline Studies on PHA in Activated Sludge Microbial Studies Chemical Structure and its Occurrence Biochemistry of PHA Production by Activated Sludge PHA Production by PAOs under Anaerobic Conditions PHA Production by GAOs under Anaerobic Conditions Microbiologic and Genetic Aspects of PHA Accumulation by Activated Sludge Outlook and Perspectives Patents Keywords: Activated Sludge; polyhydroxyalkanoates; polyphosphate-accumulating organisms; glycogen-accumulating organisms; unculturable organisms; polyphosphate; glycogen; glycolysis; TCA cycle; 3HV fermentation; anaerobic-aerobic; microbial ecology; enhanced biological phosphorus removal

  • Recovery of biodegradable plastics from Activated Sludge process
    Water Science and Technology, 2000
    Co-Authors: Hirotsugu Takabatake, Takashi Mino, Hitoshi Satoh, T Matsuo
    Abstract:

    In this research, PHA (polyhydroxyalkanoate) production system by Activated Sludge was studied. PHA behaves as carbon and energy storage material in bacteria. And PHA is a biodegradable plastic when extracted from bacteria. In this paper, the investigations from 3 aspects were reported; control of PHA composition, PHA production under coexistence of nitrogenous compounds, and influence of enrichment condition on PHA productivity. As results, it was possible to regulate PHA composition by utilizing acetate and propionate as carbon source and by regulating its composition. Nitrogenous compounds did not depress PHA productivities in the case of Activated Sludge, while nitrogenous compounds usually depress in general. PHA contents of MLSS were achieved up to 57% by using anaerobic-aerobic Activated Sludge. But microaerophilic-aerobic process could supply stably the Activated Sludge which accumulated PHA with high efficiency.

  • PHA production by Activated Sludge.
    International Journal of Biological Macromolecules, 1999
    Co-Authors: Hiroyasu Satoh, Takashi Mino, Tomonori Matsuo
    Abstract:

    Abstract The production of polyhydroxyalkanoate by anaerobic–aerobic Activated Sludge was reviewed concentrating on the biochemical mechanisms and on the trials to increase polyhydroxyalkanoate (PHA) content in Activated Sludge. The anaerobic–aerobic Activated Sludge system selects microorganisms with the capabilities to couple glycolysis, polyphosphate degradation, and PHA accumulation for anaerobic substrate uptake. Some of the PHA-related metabolisms observed there have not been seen in pure cultures so far. Such metabolisms are the formation of PHA containing 3-hydroxy-2-methylvalerate, and ‘3-hydroxyvalerate fermentation’ in which glucose or glycogen is converted to 3-hydroxyvalerate-rich PHA while yielding energy. The PHA content of Activated Sludge can be increased up to 62% by applying a microaerophilic–aerobic Activated Sludge process. PHA production by Activated Sludge is worth investigation.

  • Activated Sludge model no 3
    Water Science and Technology, 1999
    Co-Authors: Willi Gujer, Takashi Mino, Mogens Henze, Mark C M Van Loosdrecht
    Abstract:

    The Activated Sludge Model No. 3 (ASM3) can predict oxygen consumption, Sludge production, nitrification and denitrification of Activated Sludge systems. It relates to the Activated Sludge Model No. 1 (ASM1) and corrects for some defects of ASM1. In addition to ASM1, ASM3 includes storage of organic substrates as a new process. The lysis (decay) process is exchanged for an endogenous respiration process. ASM3 is provided as a reference in a form which can be implemented in a computer code without further adjustments. Typical kinetic and stoichiometric parameters are provided for 10°C and 20°C together with the composition of a typical primary effluent in terms of the model components.

  • Activated Sludge model no 2d asm2d
    Water Science and Technology, 1999
    Co-Authors: Mogens Henze, Takashi Mino, Tomonori Matsuo, Willi Gujer, M. C. Wentzel, G V R Marais, Mark C M Van Loosdrecht
    Abstract:

    The Activated Sludge Model No. 2d (ASM2d) presents a model for biological phosphorus removal with simultaneous nitrification-denitrification in Activated Sludge systems. ASM2d is based on ASM2 and is expanded to include the denitrifying activity of the phosphorus accumulating organisms (PAOs). This extension of ASM2 allows for improved modeling of the processes, especially with respect to the dynamics of nitrate and phosphate.

Robert J. Seviour - One of the best experts on this subject based on the ideXlab platform.

  • microbial ecology of Activated Sludge
    Water intelligence online, 2010
    Co-Authors: Robert J. Seviour, Per Halkjaer Nielsen
    Abstract:

    Microbial Ecology of Activated Sludge, written for both microbiologists and engineers, critically reviews our current understanding of the microbiology of Activated Sludge, the most commonly used process for treating both domestic and industrial wastes. The contributors are all internationally recognized as leading research workers in Activated Sludge microbiology, and all have made valuable contributions to our present understanding of the process. The book pays particular attention to how the application of molecular methods has changed our perceptions of the identity of the filamentous bacteria causing the operational disorders of bulking and foaming, and the bacteria responsible for nitrification and denitrification and phosphorus accumulation in nutrient removal processes. Special attention is given to how it is now becoming possible to relate the composition of the community of microbes present in Activated Sludge, and the in situ function of individual populations there, and how such information might be used to manage and control these systems better. Detailed descriptions of some of these molecular methods are provided to allow newcomers to this field of study an opportunity to apply them in their research. Comprehensive descriptions of organisms of interest and importance are also given, together with high quality photos of Activated Sludge microbes. Activated Sludge processes have been used globally for nearly 100 years, and yet we still know very little of how they work. In the past 15 years the advent of molecular culture independent methods of study have provided tools enabling microbiologists to understand which organisms are present in Activated Sludge, and critically, what they might be doing there. Microbial Ecology of Activated Sludge will be the first book available to deal comprehensively with the very exciting new information from applying these methods, and their impact on how we now view microbiologically mediated processes taking place there. As such it will be essential reading for microbial ecologists, environmental biotechnologists and engineers involved in designing and managing these plants. It will also be suitable for postgraduate students working in this field.

  • Encyclopedia of Environmental Microbiology - Activated Sludge—The Process
    Encyclopedia of Environmental Microbiology, 2003
    Co-Authors: K.c. Lindrea, Robert J. Seviour
    Abstract:

    Features of the Process Configurations for Activated Sludge Systems Conventional Activated Sludge Systems Activated Sludge Systems Designed to Remove Nitrogen Activated Sludge Systems Designed to Remove Phosphorus The Future for Activated Sludge Processes? Keywords: Activated Sludge; wastewater treatment

  • Encyclopedia of Environmental Microbiology - Activated Sludge—The Microbial Community
    Encyclopedia of Environmental Microbiology, 2003
    Co-Authors: Robert J. Seviour, A. M. Maszenan
    Abstract:

    Why This Ignorance? So What is Known So Far About the Microbial Communities in Activated Sludge Plants? The Activated Sludge Food Chain? Which Factors Decide the Fate of These Microbes in Activated Sludge? Can Our Communities be Manipulated to Improve Plant Performance? Keywords: Activated Sludge; wastewater treatment

  • The Microbiology of Activated Sludge - The Microbiology of Activated Sludge
    1999
    Co-Authors: Robert J. Seviour, Linda L. Blackall
    Abstract:

    Preface. 1. Introduction to the microorganisms found in Activated Sludge processes R.J. Seviour, L.L. Blackall. 2. The Activated Sludge process R.J. Seviour, et al. 3. The normal microbial communities of Activated Sludge plants R.J. Seviour. 4. Factors affecting the occurrence of filamentous bacteria in Activated Sludge plants R.J. Seviour. 5. Current taxonomic status of filamentous bacteria found in Activated Sludge plants R.J. Seviour, L.L. Blackall. 6. Bulking L.L. Blackall. 7. Foaming J. Soddell. 8. The microbiology of nitrogen removal in Activated Sludge systems L.L. Blackall, P. Burrell. 9. Microbiological aspects of phosphorus removal in Activated Sludge systems P.I. Bond, G.N. Rees. 10. Practical methods for the examination and characterization of Activated Sludge K.C. Lindrea, et al. 11. Descriptions of the filamentous bacteria causing bulking and foaming in Activated Sludge plants E.M. Seviour, et al. Flossary, References. Index.

Simona Ciẑinska - One of the best experts on this subject based on the ideXlab platform.

  • thickening of waste Activated Sludge by biological flotation
    Water Research, 1992
    Co-Authors: Simona Ciẑinska, Vit Matěj, Claes Wase, Yvonne Klasson, Jakub Krejci, Gunnel Dalhammar
    Abstract:

    Waste Activated Sludge was thickened by biological flotation without polymer flocculant dosage. The BIOFLOT® process utilizes the denitrifying ability of Activated Sludge bacteria. Gaseous products of anaerobic nitrate reduction cause spontaneous flotation of the Sludge suspended solids. Laboratory tests confirmed the dependence of Sludge thickening efficiency on available nitrate concentration, flotation time and temperature. Full-scale experiments were performed in a fully automatized unit for discontinuous Sludge thickening from wastewater treatment plants with a capacity of up to 5000 I.E. Waste Activated Sludge from wastewater treatment plants at Pisek. Milevsko and Bjornlunda was thickened from 6.2, 10.7 and 3.5 g/l MLSS to 59.4, 59.7 and 66.7 g/t MLSS, respectively. Concentrations of COD, ammonium and phosphate ions were decreased in Sludge water. The average nitrate consumption for bioflotation was 21.2 mg NO1− per 1 g of MLSS of Activated Sludge. Flotation time ranged from 4 to 48 h.

Juan Zhao - One of the best experts on this subject based on the ideXlab platform.

  • Biodegradation of nonylphenol polyethoxylates by denitrifying Activated Sludge
    Water Research, 2008
    Co-Authors: Jian Lu, Yiliang He, Jun Wu, Wen-ying Zhang, Juan Zhao
    Abstract:

    Abstract Biodegradation of nonylphenol polyethoxylates (NPEOs) by denitrifying Activated Sludge was investigated. The results showed that NPEOs were readily degraded in the denitrifying Activated Sludge process. Organic substance, initial concentration, and temperature had great influence on biodegradation of NPEOs in the denitrifying Activated Sludge process while the influence of biodegradation intermediates such as nonylphenol (NP) could be neglected. Biodegradation of NPEOs was severely inhibited in the presence of organic substances. Different organic substances had different inhibition ability on the biodegradation of NPEOs. The maximum biodegradation rate increased 2.51 μM d−1 for each 10 μM increase in initial concentration of NPEOs. This linear relationship was maintained even at relatively high initial concentration. The decrease in temperature caused a sharp decrease in the removal efficiency of NPEOs. The temperature coefficient (Φ) for the biodegradation of NPEOs in the denitrifying Activated Sludge process was 0.011 °C−1. NPEOs were biodegraded through a nonoxidative pathway, through which NPEOs were degraded via sequential removal of ethoxyl units (as acetaldehyde) to NP. Compared to anaerobic Activated Sludge treatment, denitrifying Activated Sludge treatment had much higher removal efficiency of NPEO contaminants. To our knowledge, it is the first report on the biodegradation of NPEOs in denitrifying Activated Sludge process.

  • Biodegradation of nonylphenol polyethoxylates by denitrifying Activated Sludge.
    Water research, 2007
    Co-Authors: Jian Lu, Yiliang He, Jun Wu, Wen-ying Zhang, Juan Zhao
    Abstract:

    Biodegradation of nonylphenol polyethoxylates (NPEOs) by denitrifying Activated Sludge was investigated. The results showed that NPEOs were readily degraded in the denitrifying Activated Sludge process. Organic substance, initial concentration, and temperature had great influence on biodegradation of NPEOs in the denitrifying Activated Sludge process while the influence of biodegradation intermediates such as nonylphenol (NP) could be neglected. Biodegradation of NPEOs was severely inhibited in the presence of organic substances. Different organic substances had different inhibition ability on the biodegradation of NPEOs. The maximum biodegradation rate increased 2.51 microM d(-1) for each 10 microM increase in initial concentration of NPEOs. This linear relationship was maintained even at relatively high initial concentration. The decrease in temperature caused a sharp decrease in the removal efficiency of NPEOs. The temperature coefficient (Phi) for the biodegradation of NPEOs in the denitrifying Activated Sludge process was 0.011 degrees C(-1). NPEOs were biodegraded through a nonoxidative pathway, through which NPEOs were degraded via sequential removal of ethoxyl units (as acetaldehyde) to NP. Compared to anaerobic Activated Sludge treatment, denitrifying Activated Sludge treatment had much higher removal efficiency of NPEO contaminants. To our knowledge, it is the first report on the biodegradation of NPEOs in denitrifying Activated Sludge process.