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Diffusion of Oxygen Through Activated Sludge Flocs: Experimental Measurement, Modeling, and Implications for Simultaneous Nitrification and Denitrification
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ABSTRACT:
Diffusion of dissolved oxygen through activated sludge flocs was studied, as it represents a potential mechanism for simultaneous nitrification and denitritication in activated sludge systems. Dissolved oxygen profiles through six floc particles collected at different times from a full-scale activated sludge plant demonstrated that that the dissolved oxygen concentration declines through all floc particles. For larger floc particles (2-mm diameter and greater), the dissolved ...
Related newspaper, magazine, and journal articles from HighBeam Research
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Diffusion of Oxygen Through Activated Sludge Flocs: Experimental Measurement, Modeling, and Implications for Simultaneous Nitrification and Denitrification
Water Environment Research
; ABSTRACT: Diffusion of dissolved oxygen through activated sludge flocs was studied, as it represents a potential mechanism for simultaneous nitrification and denitritication in activated sludge systems. Dissolved oxygen profiles through six floc particles collected at different times from a
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Improved Computational Model (AQUIFAS) for Activated Sludge, Integrated Fixed-Film Activated Sludge, and Moving-Bed Biofilm Reactor Systems, Part I: Semi-Empirical Model Development
Water Environment Research
; ABSTRACT: Research was undertaken to develop a model for activated sludge, integrated fixed-film activated sludge (IFAS), and moving-bed biofilm reactor (MBBR) systems. The model can operate with up to 12 cells (reactors) in series, with biofilm media incorporated to one or more cells, except the
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Biotransformation of Estrogens in Nitrifying Activated Sludge Under Aerobic and Alternating Anoxic/Aerobic Conditions
Water Environment Research
; ABSTRACT: Natural and synthetic estrogens present in municipal wastewater can be biodegraded during treatment, particularly in activated sludge. The objective was to assess the extent of transformation of 17946;-estradiol (E2) and 17945;-ethinylestradiol (EE2) by nitrifying activated sludge and
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Oxidation-Reduction Potential Changes in Aeration Tanks and Microprofiles of Activated Sludge Floc in Medium- and Low-Strength Wastewaters
Water Environment Research
; ABSTRACT: Real-lime control of aeration tank operation is key to high-efficiency pollutant removal and energy savings. One of the aims of this study was to examine the potential for using redox potential (oxidation-reduction potential [ORP]) to indicate wastewater quality online in aeration tanks
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Effects of Nitrogen and Phosphorus Limitation on the Activated Sludge Biomass in a Kraft Mill Biotreatment System
Water Environment Research
; ABSTRACT: Unlike wastewater, pulp and paper mill effluents are generally severely deficient in bioavailable nitrogen and phosphorus. The influence of nitrogen and phosphorus limitations on steady-state or typical pulp and paper mill activated sludge floc properties and performance was studied using
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Varying effects of low dissolved oxygen on trophic interactions in an estuarine food web.
Ecological Monographs
; INTRODUCTION The extent to which ecologists should focus on populations or species as compared to ecosystem-level properties in order to understand ecological systems has been debated throughout this century. In 1926, Gleason suggested that every species is a law unto itself, the distribution of
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Physiological tolerance ranges of larval Caenis latipennis (Ephemeroptera: Caenidae) in response to fluctuations in dissolved oxygen concentration, pH and temperature.
The Texas Journal of Science
; Abstract. -- Laboratory experiments were conducted to investigate the physiological tolerance ranges of the mayfly Caenis latipennis (Ephemeroptera: Caenidae) from Tanyard Branch Creek in Walker County, Texas in response to stepwise fluctuations in dissolved oxygen concentrations, temperature and
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Of: A Comparison of Membrane Bioreactor and Conventional-Activated-Sludge Mixed Liquor and Biosolids Characteristics/Closure to Discussions
Water Environment Research
; (ProQuest Information and Learning: denotes formulae omitted.) Of: A Comparison of Membrane Bioreactor and Conventional-Activated-Sludge Mixed Liquor and Biosolids Characteristics, R. David Holbrook, Kevin A. Massie, John T. Novak, 77, 323 (2005). doi:10.2175/106143006X111367 Submitted by S. W.
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A comparison of physical properties of synthetic sludge with activated sludge
Water Environment Research
; ABSTRACT: Conducting physical and chemical tests with activated sludge is difficult because of its constantly changing properties. To overcome this difficulty a synthetic sludge that physically and chemically resembles activated sludge was created. In this study, the physical properties of
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The Effect of Wastewater Cations on Activated Sludge Characteristics: Effects of Aluminum and Iron in Floc
Water Environment Research
; ABSTRACT: Wastewater samples collected from seven wastewater treatment plants (WWTPs) were characterized to assess the impacts of wastewater cations on the activated sludge process. The cations included in this study were sodium (Na potassium, ammonium, calcium, magnesium, aluminum (Al), and iron
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