Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"PAOs"”.
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Growing an Enhanced Culture of Polyphosphate Accumulating Organisms using a University of Cape Town Membrane Bioreactor (UCTMBR) System
… utilizes polyphosphate accumulating organisms (PAOs), which can accumulate P as polyphosphate (a metal phosphate complex that requires much larger P quantities than the P used for nutritional purposes in the biomass anabolic process). The resulting P-rich sludge generated in EBPR activated …
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The effects of acetate concentrations on competition between microbial populations in enhanced biological phosphorus removal from wastewater
… for EBPR, polyphosphate accumulating organisms (PAOs), have an advantage over their competitors, the glycogen accumulating organisms (GAOs). Because research EBPR systems have been primarily sequencing batch reactors (SBRs), which include rapid feed addition and relatively high substrate …
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The Effects Of Ph On Enhanced Biological Phosphorus Removal (ebpr) With Propionic Acid As The Dominant Volatile Fatty Acid (vfa)
… where phosphorus-accumulating organisms (PAOs) are able to take up acetate faster than glycogen-accumulating organisms (GAOs). They explained this observation by comparing the growth rate of phosphorus-accumulating organisms (PAOs) and glycogen-accumulating organisms (GAOs) and found that …
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Improved tracking of phosphorus in wastewater treatment works through anaerobic digestion of p-rich sludge
… processes of phosphorus accumulating organisms (PAOs). Two major models: the “Comeau-Wentzel” model (Comeau et al., 1987) and the “Mino” model (Mino et al., 1988) were developed to explain PAO intracellular processes but the failure of these models to achieve data reconciliation when modelling …
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The Effects of Temperatures on System Performance and Bacterial Community Structure in a Biological Phosphorus Removal System
… population of phosphate accumulating organisms (PAOs) relative to non-PAOs and, therefore, greater EBPR efficiency even though the reaction rates are slower. The proliferation of PAOs relative to non-PAOs at cold temperature indicates that some of the PAOs are psychrophilic, i.e., they have …
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Prediction of struvite formation potential in Ebpr digested sludge using mass balances, batch precipitation tests, and chemical equilibrium modeling
… because phosphorus accumulating organisms (PAOs) can accumulate phosphorus beyond their metabolic needs and phosphosphorus can be relased when they are digested anaerobically. The work presented in this thesis focuses on determining the potential for struvite formation at the City of Las …
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Quantifying polyphosphate energy for modelling of polyphosphate accumulating organisms behaviour in anaerobic digestors
… of polyphosphate accumulating organisms (PAOs) in linked activated sludge-anaerobic digestion (AS-AD) systems, with particular focus on quantifying polyphosphate (PolyP) energy and its role in PAO metabolism. The study was motivated by observed discrepancies between theoretical predictions …
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Characterizing Kinetic Shifts in Nitrifying, Denitrifying, and Phosphorus Removing Biomass Adapting to Low DO
… kinetics for nitrifiers, denitrifiers, and PAOs simultaneously is lacking. Here a method was developed to simultaneously measure the oxygen kinetics of nitrifiers, denitrifiers, and PAOs. This method, termed the SND and P-Uptake Oxygen Kinetics test, was able to estimate the ammonia …
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Metagenomic characterization of Candidatatus Defluviicoccus tetraformis TFO71, a tetrad-forming organism, predominant in an anaerobic-aerobic membrane bioreactor with deteriorated biological phosphorus removal
… transporters that are characteristic of PAOs (CAP UW-1, Microlunatus phosphovorus NM-1, and Tetrasphaera species). As a first step in characterizing EBPR-associated DTFO metabolism, this study identifies important differences between TFO and PAO that may contribute to EBPR community …
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Aerobic digestion of waste activated sludge from biological nutrient removal activated sludge systems
… rates of phosphorus accumulating organisms (PAOs) and ordinary heterotrophic organisms (OHOs), and (5) evaluate the ASM-2 simulation results with steady state aerobic batch digestion model.
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Evaluation of Glycerol and Waste Alcohol as Supplemental Carbon Sources for Denitrification
… by polyphosphate-accumulating organisms (PAOs), or due to competition between PAOs and GAOs. Although denitrification of nitrate to nitrite occurs more quickly with prolonged glycerol addition, it also results in an increased carbon demand which causes a significant impact economically.
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A Decomposition Strategy Based on Thermoeconomic Isolation Applied to the Optimal Synthesis/Design and Operation of an Advanced Fighter Aircraft System
… vapor compressor and PAO loops sub-system (VC/PAOS), and airframe sub-system (AFS) of which the AFS is a non-energy based sub-system. Configurational optimization was applied. Thus, a number of different configurations for each sub-system were considered. The most promising set of candidate …
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Optimizing Enhanced Biological Phosphorus Removal at WRRFs: Impact of Low DO Operation and Full-Scale Strategies
… toward polyphosphate-accumulating organisms (PAOs). Statistical analysis revealed that low DO operation (DO concentrations below 1 mg O2/L) did not negatively impact effluent TP concentrations and were positively correlated with increased PAO abundance. High rates of denitrification fueled by …
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Anaerobic Digestion Steady State model parameter estimation for determination of waste activated sludge characteristics
… containing Polyphosphate Accumulating Organisms (PAOs) from a full-scale WWTP as input variables in the Steady State (SS) Anaerobic Digestion (AD) model to ensure accurate prediction of AD performance. The experimental setup used in this research consisted of two completely mixed laboratory scale …
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Nutrient (Ammonium and Phosphate) Removal Using Aerobic Granulation at Pilot scale
… potential polyphosphate accumulating organisms (PAOs) were also identified. The long-term performance showed that the ammonium nitrogen (NH4-N) removal efficiencies established inverse relation with ammonium nitrogen loading rate (NLR). Phosphate (PO4-P) removal efficiency, on the contrary, …
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Tracking Inorganic Solids in Biological Enhanced Phosphorus Removal Wastewater Treatment Systems
… by phosphorus accumulating microorganisms (PAOs) and precipitation of inorganic minerals (e.g., struvite). Up until now, the only test that provides information on inorganic settleable or suspended solids (ISS) is the total solids test which yields the total lumped ISS mass of sewage or …
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The Effect of Slowly Biodegradable Carbon on the Morphology, Integrity and Performance of Aerobic Granular Sludge
… nitrous acid (FNA) inhibited the selection of PAOs when nitrite accumulated in the AGRs. The microscopic investigations and the EPS extraction showed that the presence of particulate starch in the feeding solution influenced the morphology and the structure of the granules. The granule surface …
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Fighter Aircraft Synthesis/Design Optimization
… compression/polyalphaolefin loop subsystem (VC/PAOS), electrical subsystem (ES), central hydraulics subsystem (CHS), oil loop subsystem (OLS), and flight controls subsystem (FCS). The decomposition strategy called Iterative Local-Global Optimization (ILGO) is incorporated into a new engineering …
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Evaluation of Nitrification Inhibition Using Bench-Scale Rate Measurements, Profile Sampling, and Process Simulation Modeling
… uptake by phosphorus accumulating organisms (PAOs). • Evaluate the impact of sporadic ferric chloride addition to the biological process as a means of preventing effluent TP exceedances. • Evaluate the design μmax to the actual observed μmax for AOB through simulation modeling. • Compare …
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A Comparison of Wastewater Process Modelling Tools: Case Study of Potsdam WWTW
… rates for the poly accumulating organisms (PAOs), namely a higher growth rate constant under phosphorous rich conditions which results in a higher uptake of phosphorous, and a lower growth rate constant under phosphorous limited conditions, where phosphorous uptake is limited. With a lower …