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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 69 for “"upflow"”.
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Limestone dissolution kinetics in upflow reactor systems
Waters derived from the Table Mountain sandstones are soft and acidic. Consequently they tend to be highly aggressive to cement materials and corrosive to metals. Full stabilization is normally effected using lime and carbon dioxide, this however is expensive and inappropriate in many rural areas. …
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Pelletization in the upflow anaerobic sludge bed (UASB) reactor
… of treating an apple juicing waste water in an upflow anaerobic sludge bed (UASB) reactor system. Past experience with this system suggested that a pelletized sludge would be produced due to the nature of the waste water. This indeed was observed but the system exhibited an unusual feature, a …
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Feasibility study of upflow anaerobic filter for pretreatment of municipal wastewater
Feasibility Study of Upflow Anaerobic Filter for Pretreatment of Municipal Wastewater SUMMARY Anaerobic reactors have been successfully installed in full-scale plants world-wide for treating high-strength industrial wastewater over the years. Recently, there has been significant interest in …
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Distribution and Characteristics of Biomass in an Upflow Biological Aerated Filter
The biomass from a pilot-scale two-stage (carbon oxidation first stage, ammonia oxidation second stage) fixed-film biological aerated filter (BAF) was divided in three fractions depending on their attachment strength to the media: detached, easily detachable and strongly attached. VSS measurement …
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Weak acid/bases and pH control in upflow anaerobic sludge bed reactors
Prior to the investigation into H₂CO₃*alkalinity, each waste (substrate) was studied with respect to its potential for pellet formation. During these feasibility studies, the need emerged for a simple, reliable and accurate method to monitor the H₂CO₃*alkalinity and SCFA concentration in the …
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Treatment of clam-processing wastewater using upflow anaerobic sludge blanket (UASB) technology
The Upflow Anaerobic Sludge Bed reactor (UASB) has been used successfully by the food processing, pulp and paper and municipal wastewater industries. High organic strength wastewater, limited space, extended down times and sludge handling and disposal have been critical factors in waste treatment …
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Investigation into the start-up and operation of upflow anaerobic sludge bed reactors
… biological wastewater treatment using the upflow anaerobic sludge bed (UASB) reactor technology offers the potential to reform wastewater treatment. However, the lack of clarity regarding the mechanisms responsible for self-immobilisation of the microbial consortia involved, known as …
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Upflow anaerobic sludge blanket reactors for treatment of wastewater from the brewery industry
Anaerobic digestion can be utilized to convert industrial wastewater into clean water and energy. The goal of this project was to set up lab-scale anaerobic digesters to collect data that will be used to develop and validate a predictive monitoring and controls solution to improve digester …
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Effects Of Environmental Factors On Anaerobic Granular Sludge In Upflow Anaerobic Sludge Blanket Reactors
… (20 litres) and bench-scale (1.2 litres) upflow anaerobic sludge blanket (UASB) reactors.;The anaerobic bacteria, when grown in feed lacking iron and cobalt, could become iron and/or cobalt deficient and had low specific activity. Supplements of iron and cobalt in the feed provided …
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Evaluation of Granulation Processes in Upflow Anaerobic Sludge Blanket Reactors Using Oligonucleotide Probe Hybridizations
… from non-granular sludge in two laboratory-scale upflow anaerobic sludge blanket reactors (Reactor G and Reactor GP). New probes for Methanosaeta spp. and Syntrophobacter spp. were developed. The influent of Reactor G contained glucose as the only energy source, while Reactor GP was fed glucose …
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Denitrification of Recirculating Aquaculture System Waters Using an Upflow Biofilter and a Fermented Substrate
The ability of an upflow, denitrifying biofilter using a fermentation generated carbon source to treat the high nitrate concentrations typically seen in recirculating aquaculture systems was studied using a synthetic nitrate wastewater supplied at two nitrate loadings, 1.13 and 2.52 kg …
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Development, Evaluation and Improvement of Correlations for Interphase Friction in Gas-Liquid Vertical Upflow
In this study, liquid-vapor vertical upflow has been research with the intent of finding an improved method of modelling the interphase friction in two-phase vertical flow in nuclear thermal-hydraulic codes. An improved method of modelling interphase friction should allow for better prediction of …
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Investigating upflow biofiltration using the Biostyr process by varying the organic strength of the influent
The performance of Biostyr media using an upflow biofilter scheme was investigated. Three separate Modes that varied the organic strength of the influent at an operating temperature of 12°C were evaluated to explore how nitrification and denitrification responded to different concentrations of …
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Treatment of blue crab processing wastewater using Upflow Anaerobic Sludge Blanket (UASB) and air stripping technologies
Crab cooker wastewater contains high concentrations of chemical oxygen demand (COD), total suspended solids (TSS), and total Kjeldahl nitrogen (TKN). Biological treatment of the wastewater releases high concentrations of ammonia. In this study, UASB treatment of crab cooker wastewater was …
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Bench-scale two-dimensional fluidized bed hydrodynamics and struvite growth studies
… relationship between dynamic pressure drop and upflow velocity as well the experimental protocol to determine the minimum fluidization velocity. Findings indicated that the mixture of two-sized particles would behave rather independently of each other, before the bed expansion. It was suggested …
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Collection, analysis, and utilization of biogas generated by the anaerobic treatment of crab processing wastewater
… investigated. Biogas from two laboratory-scale, upflow anaerobic filters (Systems A and B) was collected and analyzed to determine percent by volume composition of methane (CH₄), carbon dioxide (CO₂), and hydrogen sulfide (H₂S). Biogas produced by System A (upflow anaerobic bed filter) produced …
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Studies of Convective Heat Transfer Coefficient Enhancement in Two-Phase, Non-Boiling Flow
… non-boiling, two-component, two-phase flow. Both upflow and downflow of air-water mixtures were studied in a 1 inch pipe. The superficial water velocities ranged from 0.40 to 3.24 m/s with the corresponding Reynolds numbers from 15,000 to 116,000. The superficial air velocities ranged from 0.39 to …
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Experimental and modeling studies using packed bed reactors: Liquid phase ethylene production by hydrogenation of acetylene
… and in packed bed reactors in trickle flow and upflow at selected operating conditions to study the reactor performance. The selective solvent, N-methyl pyrrolidone (NMP) with absorbed acetylene, was used as the liquid phase. Rate equation models were derived and fit to the experimental data to …
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The influence of gravity on pressure drop and heat transfer in flow boiling
… flow boiling of R11 can be studied in vertical upflow, vertical downflow, and horizontal flow configurations.
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