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 28 for “"Feed composition"”.
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Study of population dynamics in a biological phosphorous removal wastewater treatment system
… the system to fail. The study indicated that feed composition may have been responsible for the bacteria population shift. The purpose of this study was to examine population shifts of polyphosphorous-removing (PP) bacteria and the unknown bacteria (G bacteria) in a bench-scale sequencing …
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Feedforward control of binary distillation
… functions relating distillate and bottoms composition to feed composition, reflux rate and boilup rate were determined from pulse tests of a binary distillation column. Similar transfer functions were determined by mathematical solution of the linearized differential equations describing …
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Hydroformylation of high temperature Fischer-Tropsch synthol products for the production of detergent alcohols
… an inexpensive and alternative hydroformylation feedstock for producing Oxo alcohols has been investigated. These alcohols are precursors for biodegradable detergents. The HTF-T product targeted as a feedstock source was Synthol Light Oil (SLO), in the C₈ to C₁₂ range. The aim of the work was to …
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Methods and challenges of experimental system identification of a distillation column
… as a teaching tool, but is currently without a feedback control system. An eventual goal of developing such a control system requires that the behavior of the column be understood. It is necessary to identify which of the column parameters can change, either ones that change to cause a …
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Characterization of starch-additive interactions in starch-based systems during twin-screw extrusion
… is important to be able to predict behavior of feed ingredients on the characteristics of extruded products. Thus, the effects of feed composition on the overall performance of a twin-screw extruder and the final product characteristics were investigated. Addition of ingredients such as silicon …
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The use of ruthenium Y zeolite catalysts for the selective methanation of carbon monoxide
… and 210°C at various space velocities with a feed composition of 1% CO, 20% CO2, 10% H2O, 59% H2 and 10% Ar. The effects of loading, space velocity and reaction temperature on the CO conversion and CO selectivity were investigated. The 2.2 wt.% was found to be the optimum loading by displaying …
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Exploring volatile fatty acids (VFAs) as a novel substrate for microbial oil production
… production of biofuels depends critically on feedstock cost and availability. As such, volatile fatty acids (VFAs) can play an important role in advancing sustainable biofuel production since they can be derived from low cost feedstock including gases and municipal solid waste. To this end, we …
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Computer control of chemical process plants with special reference to distillation
… and in the face of a step change in the feed rate. A method of extending linear filtering theory to highly nonlinear systems with very nonlinear measurement functional relationships has been proposed and tested by simulation on binary distillation. The simulation results have proved that …
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Controlling trace impurities in a dividing wall distillation column
… wall distillation columns (DWCs) separate a feed mixture into three pure product streams using one column shell. Though attractive due to capital and operational savings, DWCs have yet to gain widespread industrial acceptance. One notable concern is controllability. The research within this …
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Synthesis and characterization of thermally stable palladium-based composite membranes for high temperature applications
… equilibrium predicted (< 35%) for the feed composition at these process conditions. The long term operation (> 500 hours) revealed the potential suitability of these Pd-alloys to be candidates for use in SMR membrane reactors at temperature as high as 600 °C. The permeate hydrogen flux …
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The chromatographic separation of carbohydrate mixtures
… relationships. The effects of flow rates, feed composition and concentration on the separation performance of the SCCR7 were identified and general relationships between them and the switch time, which was found to be the controlling parameter, were developed. Fructose rich (FRP) and …
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Digestible Energy and Carbohydrates in the Nutrition of Tilapia (Oreochromis niloticus Linn.)
… apparent digestibilities of a series of tropical feeds were evaluated in feeding trials with tilapia. A standardised method of measuring feed digestibility is reported and microassays are described which enable analysis of energy, nitrogen and chromium in the small faecal samples (c. 150 mg) …
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Zeolite deactivation during hydrocarbon reactions: characterisation of coke precursors and acidity, product distribution
… reaction temperatures, time-on-streams and composition. Three novel techniques, coke classification, thermogravimetric method for characterising coke precursors and indirect temperature programmed desorption (TPD) for catalyst acid sites characterisation were developed to further study …
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Optimal retrofit and process design of distillation plants for energy saving and process intensification
… mixture considered with five different feed compositions. All the possible simple column sequences were first analyzed using different sets of heuristic rules and after with more rigorous evaluation. The different solutions are compared to put in evidence the limitations of the heuristic …
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Fundamental investigations on the barrier effect of polyester micro fiber fabrics towards particle-loaded liquids induced by surface hydrophobization
… high level with increasing amount of C2H4 in the feed composition. An essentially vital concern of the work was the characterization of the treatment effect comprising both physical and chemical aspects. By washing the materials for 20 times no significant impairment of hydrophobic character has …
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Industrial Ni-Based Catalyst Development for Carbon Dioxide Reforming of Methane
… at 850 °C were evaluated with various biogas feed compositions. Steam content in the feed gas was the key factor affecting the catalytic performance. The Ni-Co bimetallic, Ni monometallic, and Co monometallic catalysts could not handle a biogas feed composition with more than 12, 15, and 6 …
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Evaluating Winemaking Applications of Ultrafiltration
… membrane-based technology that separates liquid feed by a molecular size principle, producing permeate with smaller molecules and retentate with larger molecules. Widely used in water treatment, it finds application in the food and beverage industries for processes such as clarification, specific …
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Thyroid Status in Exercising Horses and Laminitic Ponies
… study assessed the effects of exercise and feed composition on thyroid status. Thirteen mature Arabian geldings, adapted to either a high sugar and starch (SS) or high fat and fiber (FF) feed, underwent 15 wk of exercise training followed by a treadmill exercise test. The TRH response tests …
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Kinetic study of dry reforming of Methane with Ni over different supports and Pt/Al2O3
… CO and H2 on reaction network, respective co-feeds CO and H2 were added. Therefore, the complete kinetic test can be divided into three parts: stabilization period, parameter field test, and co-feed test. For the stabilization period, the feed composition amounted to 10% CH4, 10% CO2, 10% N2 …
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