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 31 for “"Capillary suction"”.
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Characterization of sludges produced when using polyaluminum chloride coagulants
… specific resistance to filtration (r*), capillary suction time (CST), and sludge pH. The effects of chemical conditioning (lime and cationic polymer) and mixing intensity (Gt) upon the sludge dewatering characteristics in a pilot-scale plate and frame press were also studied. The …
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Effect of high-stress mixing on polyelectrolyte conditioning of sludges
… and cationic high molecular weight polymers. Capillary suction time (CST) was used to measure relative changes in dewatering rates. Results indicated that readily dewatered sludges can be obtained when subjected to high-stress mixing conditions. The most significant parameters governing …
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Effect of Solids Retention Time on Activated Sludge Properties and Effluent Quality
… SRT, the resistance to shear decreased and the capillary suction time (CST) increased. Following an initial increase, the sludge volume index (SVI) decreased at higher SRT.
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Polymer dose prediction for sludge dewatering with a belt filter press
… and two sludge dewatering response tests: the capillary suction time test and the time-to filter test. Full-scale testing measured the belt press response to belt speed, sludge throughput, and polymer dose. Data indicated that the conditioning and dewatering scheme of the three belt filter …
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Conceptual models of fluid flow in fractures
… It is then absorbed by the matrix due to the capillary suction. Then, due to the capillary force, the liquid moves towards the heat source. A region of liquid vapor flow is formed which is called the heat pipe region. The heat pipe phenomenon will be analyzed for different models of fractures. …
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Formulation and testing of a distributed triangular irregular network rainfall/runoff model
… modified to allow for continuous simulation and capillary suction. This thesis also develops the datasets needed for the tRIBS model. Starting from Digital Elevation Models, watersheds are delineated and then manipulated using geographic information systems to form a TIN. Algorithms to create …
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Laboratory studies using sodium-bearing waste simulant - ADL 26-94
… to properly condition the sludge by use of capillary suction time (CST) apparatus and wedge zone simulator (WZS). Low impeller mixing speeds cause less excess floc deterioration and lower resistance to filtration. Slower base addition rates increase the overall titration time but improve …
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High-Intensity Shear as a Wet Sludge Disintegration Technology and a Mechanism for Floc Structure Analysis
… properties of activated sludge, measured by capillary suction time, deteriorated with the addition of sheared solids, but reaeration resulted in near complete recovery. The role of iron and iron chemistry plays a critical role in the activated sludge. Iron apparently selectively removes …
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Effect of mixing intensity on polymer conditioning of sludges
… agents. Dewatering rates were measured by the capillary suction time (CST) apparatus. The effect of rapid mixing on the polymer efficiency was evaluated by premixing the polymer, using the same mixing apparatus, prior to applying it to condition the sludge. Data analyses revealed the great …
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Transport and sorption phenomena in concrete and other porous media
… shown to decrease the penetration. <br> RII:1, Capillary suction is studied using a Newtonian fluid assumption together with a momentum source term reflecting the influence of the pore walls on the capillary sucked fluid. <br> RIII:1, The heat of adsorption of different molecule layers on dry …
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The effect of polymer dose and mixing intensity on sludge dewatering with a plate and frame filter press
… was measured in bench- scale experiments with a Capillary Suction Time (CST) device and dewatering rate in pilot-scale experiments was quantified by measuring the volume of filtrate from the plate and frame press. The dimensionless quantity, Gt, was used to measure total mixing intensity input …
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Effects of storage on water treatment plant sludges
… as measured by specific resistance and capillary suction time were found to improve when sludge redox potential readings remained over 100 mV but varied greatly when readings were below this level. Field monitoring and sampling of the clarifiers at Lee Hall WTP and Harwood's Mill WTP …
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Impact, spreading, and drying of complex fluid drops
… of coupled processes—rapid inertial spreading, capillary-driven relaxation, contact-line motion, imbibition into porous substrates, evaporation, and, in complex fluids, compositional redistribution. This thesis investigates how these mechanisms collectively shape the observable footprint and how …
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The mechanisms of moisture ingress & migration in rammed earth walls.
… used for laboratory experiments that determined capillary suction and pressure-driven moisture ingress properties, and full-scale test walls were used in the SHU climatic simulation chamber. The experimental data was analysed and found to be in good agreement with existing theories on …
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Physical Sulphate Attack on Concrete
… diameter pores and the associated growth of capillary suction and surface area for evaporation. Epoxy- and silane-based surface treatment materials were found to be adequate for protecting both cured and non-cured concrete exposed to physical sulphate attack. However, it was found that …
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Entrained Air-Void System For Durable Highway Concrete
… including introducing water through capillary suction and changing the freezing solution to incorporate deicing salts, 3- A combination of modification approaches including application of a concentrated pre-storm brine followed by drying.The F-T research was performed in three phases. …
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Dewatering Of Biosolids By Sodium Ferrate
… were evaluated. For filtration, the Capillary Suction Time test was used. The optimum doses and conditions for dewatering of the sludge using ferrate were determined for each type of sludge. The centrifugation and filtration results were compared with those obtained for polymer doses …
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Optimal transport strategies
… and tested against existing data. While suction is the most common drinking strategy, various alternative styles have evolved among creatures whose morphological, physiological and environmental constraints preclude it. Many small creatures rely on relatively subtle capillary effects for …
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Investigation of effect of dynamic operational conditions on membrane fouling in a membrane enhanced biological phosphorus removal process
… tests were conducted, including critical flux, capillary suction time (CST), time to filter (TTF) and, bound and soluble extracellular polymeric substances (EPS) were quantified, to evaluate their role on membrane fouling. The tests results suggest that the inflow variation in an MEBPR process …
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