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Showing 1 to 20 of 78 for “"Activated Sludge Process"”.
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The contact stabilization activated sludge process
… and Marais put forward a general model for the activated sludge process based on an energy requirement for adsorption of the nutrient onto the organisms. They briefly outlined an alternative bi-substrate hypothesis in which the energy requirement for adsorption fell away. No evidence in support …
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Kinetics of the activated sludge process
… the more important papers on the kinetics of the activated sludge process. These papers chronologically trace developments in the kinetic theory, from aerobic steady state behaviour to aerobic, nitrification and denitrification behaviour under cyclic flow and load conditions in multi-reactor …
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Nitrification and denitrification in the activated sludge process
The characteristics of the single-sludge nitrification-denitrification process were investigated using influent organics as the carbon source and nitrate as an electron acceptor to see if any oxygen savings could be obtained. The key research tools used were mathematical modeling, computer …
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Phosphorus removal in the modified activated sludge process
… contributes to excess removal of phosphorus in activated sludge systems, i.e. removal in excess of the basic biological requirement for metabolic purposes. This objective was pursued by imposing conditions in which one or the other of the two mechanisms had negligible influence. From the series …
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Biological Removal of Colloidal Waste in Activated Sludge Process
Made available in DSpace on 2014-12-08T23:56:26Z (GMT). No. of bitstreams: 1 6604134.pdf: 6171729 bytes, checksum: b61d4796934bedbcc291a2eddcc80dcd (MD5) Previous issue date: 1965
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Nitrification and denitrification kinetics in the activated sludge process
… Ekama and Marais (1980), to describe the aerobic activated sludge process, was extended to provide a reliable description of the behaviour of the nitrification-denitrification single sludge activated sludge process under constant, cyclic or unsteady conditions of flow and load. The extended model …
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Air diffusion in the activated sludge process of sewage treatment
Made available in DSpace on 2016-11-09T23:47:16Z (GMT). No. of bitstreams: 2 5997918.pdf: 4944231 bytes, checksum: f9c73842c43441ba0bebd6fd49669b27 (MD5) license.txt: 4183 bytes, checksum: 1dcc2037833d76bede73d5717587543b (MD5) Previous issue date: 1917
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Activated sludge process : effects of feed concentration on effluent COD
The concentration of substrates in the feed to an activated sludge process was found to exert a significant effect upon its effluent COD. A mathematical model was proposed to explain this effect and was successful in correlating the data of this study. The model was based on the hypothesis that COD …
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Kinetics of enhanced phosphorus removal in the activated sludge process
… into the removal of phosphorus in the activated sludge process showed that: (1) Luxury uptake of phosphorus may be induced by the presence of an anoxic zone (2) If a primary and secondary anoxic reactor are present in the system, the actual retention time of the primary anoxic reactor …
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Chemical and biological phosphorus removal in the activated sludge process
… removal characteristics of the Modified Activated Sludge Process could be enhanced by the in-plant addition of iron salts. The motivation for the investigation was: 1. Due to the lack of understanding of the exact pre-requisites for inducing excess biological phosphorus removal (luxury …
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D.O. control and O.U.R. estimation in the activated sludge process
… estimation in a completely mixed diffused air activated sludge reactor.
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Practical aspects of the activated sludge process with seawater inclusion
The capability of the activated sludge process to operate with sea water included in the influent substrate. Sea water was added at various percentages from 5-40. The study concluded that from a biological standpoint the activated sludge process could operate successfully. However, rapid settling …
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Oxygen transfer studies in the completely mixed activated sludge process
Utilization of the activated sludge process is widespread although many of the mechanisms that make it work are still relatively misunderstood. Recent studies have indicated that dual substrate limitations may occur in the process. Several misconceptions in the basic fundamentals regarding the …
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The effect of high purity oxygen on the activated sludge process
… high purity oxygen as the gas of aeration on the activated sludge process. Three completely-mixed cylindrical reactors were used in the study. The working volume for two of the reactors was 10.4 liters while that for the third was 4 liters. The gas of aeration for the small reactor and one of the …
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The effects of nickel on the completely mixed activated sludge process
… flow laboratory experiments with bench scale activated sludge units to determine the effects of nickel on the completely mixed activated sludge process. The model units were located in a constant temperature room maintained at 20±2°C. The batch reactors were operated under acclimated and shock …
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Kinetics of biological nitrogen removal in a single sludge activated sludge process
… nitrification and denitrification in the single sludge nitrification-denitrification activated sludge process.
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Verification of the bisubstrate concept in modelling of the activated sludge process
… research, since 1970, into the behaviour of activated sludge systems at the University of Cape Town has culminated in the formulation of a general kinetic model, by Dold and Marais (1986). The model is highly complex, incorporating a number of different processes; however extensive simulation …
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A comparison of oxygen utilization determination techniques for the activated sludge process
Evaluation of the data from the series of batch experiments has led to the following conclusions: 1. Currently used methods of quantifying oxygen uptake rate, especially for batch reactors, yield values of oxygen utilization considerably lower than those predicted by mass balance considerations for …
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Evaluation of oxygen uptake rate as an activated sludge process control parameter
… is a valid control parameter for monitoring the activated sludge process. A laboratory study was conducted to attempt to shed light on the controversy. Two bench-scale reactors were operated at steady state and under shock load. Oxygen uptake rate (OUR) was measured with the BOD bottle technique …
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A study of nitrate versus oxygen respiration in the activated sludge process
Utilization of the activated sludge process is widespread although many of the mechanisms involved are still relatively misunderstood. Incorporation of nitrate respiration (denitrification) into the activated sludge process can have many advantages, but little is known about microbial growth and …
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