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 46 for “"Removal mechanism"”.
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Investigation on removal mechanism in catalytic aided electrical discharge machining of polycrystalline diamond
… EDM performance, machined surface and erosion mechanism of PCD in the influence of different types of electrode which are Copper-Nickel (Cu-Ni) and Copper (Cu) in roughing and finishing condition. Two levels of full factorial with eight center points and two replication technique was used to …
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Substrate induced failure of biological phosphorus removal
The possibility that the biological phosphorus removal mechanism can be inhibited in a continuous flow process by acetic acid passing through into the anoxic and aerobic zones of the reactor was investigated. The objectives of the research were to determine the amenability of a wastewater from the …
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Industrial Wastewater Treatment Using Dolomite And Dolomitic Sorbents
… <br/>2. Investigation of the optimum char time, removal mechanism for the removal reactive dye from aqueous solution and compare the findings with activated carbon, (F400), magnesium oxide and calcium carbonate. To determine the mechanism for the pollutant removal and finally to describe the …
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The erosion of ultrafine WC-Co
… a transition from a localised material removal mechanism to a bulk material removal mechanism was observed in both erosive systems as the WC grain size of the material decreased below about lμm. The erosion resistance of sub-micron materials was found to be considerably more sensitive to …
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The use of simultaneous chemical precipitation in modified activated sludge systems exhibiting biological enhanced phosphate removal
… been gained with biological enhanced phosphate removal (BEPR) in activated sludge systems for treating wastewater. However, BEPR tends to be sensitive and subject to many fluctuations, making it difficult to achieve full compliance with discharge standards. Simultaneous chemical addition in the …
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Development and assessment of a physics-based model for subcooled flow boiling with application to CFD
… mode of heat transfer and is the preferred heat removal mechanism in power systems in general and, more recently, in electronics cooling. Physics-based models that describe boiling heat transfer, when coupled with Computational Fluid Dynamics (CFD), can be an invaluable tool to increase the …
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Mn(II) oxidation by HOCl in the presence of iron oxides: a catalyzing effect
… (HOCI) is one specific aspect of manganese removal via oxidation that requires further investigation. Data collected in this study indicate that the rate of Mn(II) oxidation may be beneficially catalyzed by the presence of previously formed Fe(OH)₃<sub>(s)</sub> particles. The mechanistic …
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Comparative phosphorus removals using modified activated sludge processes
… cell residence times result in higher phosphorus removal efficiencies in biological reactors. 2. Higher mean solids residence times result in higher phosphorus removal efficiencies in strictly chemical reactors. 3. Calcium-phosphate precipitation can occur in continuous flow reactors in a normal …
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Mechanisms of lead and zinc removal from lead mine drainage in constructed wetland
… due to lack of detailed knowledge about metal removal mechanisms. This research has studied individually the chemistry of the major removal mechanisms and generated the parameters describing the reactions involved in metal removal in constructed wetlands, which can be used to combine different …
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Advances in measurements of particle cycling and fluxes in the ocean
The sinking flux of particles is an important removal mechanism of carbon from the surface ocean as part of the biological pump and can play a role in cycling of other chemical species. This work dealt with improving methods of measuring particle export and measuring export on different scales to …
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Advances in measurements of particle cycling and fluxes in the ocean
The sinking flux of particles is an important removal mechanism of carbon from the surface ocean as part of the biological pump and can play a role in cycling of other chemical species. This work dealt with improving methods of measuring particle export and measuring export on different scales to …
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The effect of flyash on the removal of soluble phosphate from solution
… determine the feasibility of soluble phosphate removal in a flyash contact system. The investigation consisted of experiments involving batch adsorption studies and continuous flow studies. Removal kinetics and relationships between contact time, “t” , and flyash concentration, “D<sub>f</sub>”, …
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Chemical and biological phosphorus removal in the activated sludge process
… out to establish in what degree the phosphorus 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 …
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Removal of hydrocarbons from urban stormwater runoff by gravity separation
… lab-scale Plexiglas~ settling columns to monitor removal of total hydrocarbons (THC) by extended quiescent settling. Samples were collected from the columns at specific depths and times over the 48-hour settling period. The samples were analyzed for total hydrocarbon content on a Horiba oil …
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Green approach to treat institutional wastewater by using cassava peels starch (CPS) as coagulant aid
… coagulants. This study traces the potential removal of pollutants from institutional wastewater by coagulation-flocculation processes. Alum as primary coagulant and CPS as coagulant aid was used for removal of pollutants. A series of batch experiments were performed to study the removal …
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Synergistic Environmental Aging of Glass Reinforced Polymer Composites
… of the PVC resin. Based on the synergistic aging mechanisms observed on the surfaces of the tested GRPs, a new model of synergistic aging of polymers under UV and water condensation was proposed. The model includes numerical simulations of UV radiation, numerical simulations of hydrodynamic …
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Utilization of the Phanerochaete chrysosporium ligninolytic system and the potential for toxaphene degradation
… released over a three week period. The main removal mechanism of the toxaphene from solution was observed to be adsorption to the mycelium biomass. Ligninolytic activity was equally active at temperatures less than optimum for maximum growth of the fungus which implies that the ligninolytic …
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Examination of Silica Removal with Solids Recycle for Reverse Osmosis Pretreatment
… For this reason, the subject of silica removal has been the focus of many studies; yet, there remains much to be learned. This thesis aimed to study the complex issue of silica removal as a pretreatment step to RO. A review of the literature indicated that silica is most commonly removed …
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Laser micro-processing of silicon using nanosecond pulse shaped fibre laser at 1 μm wavelength
… of the laser material interactions and material removal mechanism when using fast rise-time nanosecond laser pulse envelopes. The IR fibre laser was able to perform percussion drilling and single pulse machining on the polished Si over a range of intensities up to 1.22 GW/cm2. With the optimum …
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The Kinetics of Particulate Substrate Utilization by Bacterial Films
… expression capable of describing the removal of particulate chemical oxygen demand (PCOD) from wastewaters in biological film systems. In this context, organic particles that are maintained in suspension (i.e., not removed during normal settling) are the focus of experimentation, …
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