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Showing 1 to 20 of 39 for “"Breakthrough Curves"”.
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Correlation by dimensional analysis of breakthrough curves in fixed-bed adsorption systems
Includes bibliographical references.
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Describing and Predicting Breakthrough Curves for non-Reactive Solute Transport in Statistically Homogeneous Porous Media
… approaches to describe and predict breakthough curves (BTCs) for non-reactive solutes in statistically homogeneous porous media were numerically and experimentally investigated. Modeling approaches were: the convection-dispersion equation (CDE) with scale-dependent dispersivity, mobile-immobile …
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Solute dispersion in selected tropical soils
… and was used to trace fluid dispersion. Tritium breakthrough curves differed because of different dead-end porosities of these soils and were estimated to range from 4 to 30 per cent. Potassium, calcium, and phosphate showed trends in their breakthrough curves that were due to dead-end pores. …
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Field and laboratory investigations of solute transport through soil
… filings (Cu-Fe) at three velocities and effluent breakthrough curves were determined with an on-line HPLC. There was no detectable TCE degradation in the sand column experiments. More TCE was reduced in the presence of Cu-Fe than iron. The reduction of TCE produced ethylene which resulted in …
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On Single Well Forced Gradient Tracer Tests: Implications of Aquifer Physical Heterogeneity and Tracer Behaviour
… mixtures in these tests. Dipole flow tracer test breakthrough curves are highly susceptible to heterogeneity, and could be used to identify discrete permeability variations in aquifers. The effect of heterogeneity is not significant on push-pull test breakthrough curves, but seriously affects …
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Transport of solutes in complex hydrogeological media
… flowpaths. This was also noticed in the breakthrough curves in the form of large tails. The correlation structures displayed a trend, suggesting nonstationarity of the concentration field and the spatial continuity was higher in the transverse directions than the longitudinal direction.
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Liquid-phase adsorption of n-paraffins on type 5A molecular sieves
… mathematical model for the prediction of dynamic breakthrough curves was developed analytically and solved from the equilibrium isotherm and the mass transfer rate equation. The experimental breakthrough curves were tested against both the proposed model and a graphical method developed by …
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A new process for the separation and purification of egg yolk antibodies
… for the separation of the antibody. Analysis of breakthrough curves indicates that superficial velocity is the governing parameter in the binding of IgY to the cation exchanger. Results of a pilot scale experiment involving the application of 46.5 litres of WSF containing approximately 0.8 mg/ml …
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Transport, Stability, and Deposition of Gold Nanoparticles in Porous Media
… concentrations using both types of AuNP yielded breakthrough curves that both adhere and deviate from this hypothesis. BSA-AuNP was found to be more stable relative to cit-AuNP during porous media flow in the presence of increasing concentrations of CaCl2, but the opposite occurred with …
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Heterogeneity effects on flow and transport within a shallow fluvial aquifer
… anisotropy of the transport rates. The resulting breakthrough curves for the homogeneous and traditional geostatistical models showed no directional anisotropy but the integrated models showed anisotropic behavior consistent with the bedding direction as well as non-Fickian transport rates.
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Removal of carbon dioxide and water using a solid amine adsorption bed for extended space flight
… HSC+). Nineteen experimental adsorption breakthrough tests were conducted using a test bench at NASA/Johnson Space Center, Houston, Texas. CO$\sb2$ and H$\sb2$O adsorption equilibrium data was obtained. Analytical equations were developed to predict the overall water and carbon dioxide …
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Anomalous transport through porous and fractured media
… on correlation, whereas late-time scaling of breakthrough curves is mainly controlled by velocity heterogeneity. Our transport model captures the anomalous behavior in the breakthrough curves for both push-pull and convergent flow geometries, with the same set of parameters. Moreover, the …
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Observation scale effects on fluid transport behavior of soil
… bicontinuum models. Bicontinuum-predicted solute breakthrough curves (BTC) closely agreed with observed BTC data with mean errors of reduced concentrations </- 0.05 for 97% of the samples, Monocontinuum predicted BTC's had comparable fits with 80% of the samples having mean errors </- 0.07. The …
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Selective cation-exchange adsorption of the two major whey proteins
… acetate buffer. The t1/2 for the resulting ALA breakthrough was 75% longer than its BLG counterpart. The above results suggest the possibility of the occurrence of competitive adsorption between the proteins when adsorbed simultaneously. In traditional batch uptake experiments, the kinetic rate …
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A Field and Numerical Study of Heat and Solute Transport in a Discrete Fracture
… water (6-10 Lpm). Both solute and thermal breakthrough were observed with peak arrival within ½ hour for solute and within two hours for heat. Based on the analytical analysis of pulse interference tests that were conducted prior to the experiments (in the same test section), hydraulic …
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Selective salt recovery from reverse osmosis concentrate using inter-stage ion exchange
… in which these isotherms were used to predict breakthrough curves. Regressions relationships developed from the batch tests were used in conjunction with the model to predict the number of bed volumes to breakthrough of calcium, magnesium, and sulfate. Model and regression relationships were …
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Chloride Salts Removal by non Planted Constructed Wetlands Receiving Synthetic Brines from Belle Plaine Potash Mining
… In the 4-day format operation, the chloride breakthrough curve was discovered in all treatment CW cells, excluding the control. Moreover, the curve stated at less than 6 hours (C/C0 > 0.05) and approximately reached the break point (C/C0 > 0.95) after passing 48 hours. Then the clay media was …
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Speciation of inorganic aluminum solutions and modeling their kinetics and mechanisms of adsorption on selected solids
… and desorbed Ca as a function of time. Observed breakthrough curves (BTC) for continuous injection of the various Al solutions through kaolinite suggested the existence of at least two mechanisms for Al adsorption. It was shown that a relatively rapid reaction, where solution Al was in …
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Sorption and release of dissolved pollutants via bioretention media.
… 50%, by volume) were conducted to develop metal breakthrough curves. The breakthrough curves for Cd and Zn were fit to the Thomas Model. The resulting sorption capacities are 0.07, 0.23, 0.37, 0.78 mg Cd/g and 0.10, 0.23, 0.33, 0.61 mg Zn/g for 0, 10, 30, and 50% compost fractions, respectively. …
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The Adsorptive Separation of Aromatic Hydrocarbon Mixtures
… is proposed for the prediction of dynamic breakthrough curves from equilibrium isotherms and kinetic data. The dynamic properties of liquid phase adsorption of aromatics from slack waxes were studied at different temperatures and concentrations. The optimum operating temperature was 543 K. …
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