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Showing 1 to 20 of 66 for “"Column Experiments"”.
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Effect of surfactants on the sorption and transport of Cu(II) in a sandy soil : batch, column experiments and modeling
… in this area has been limited. Batch and column studies were conducted to investigate the sorption processes and transport behavior of Cu(II) in a sandy soil in the presence of surfactants. SDS (sodium dodecyl sulfate) and Triton X-100 were chosen as representatives of an anionic …
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Stormwater treatment during infiltration and its effect on shallow urban groundwater quality in the Cape Flats Aquifer: field study and soil-column experiments
… and in the laboratory using large-scale soil column experiments. During the field study stormwater contaminants were detected at concentrations typical of an urban residential catchment with mean values of dissolved ammonium (0.35 mg/L), dissolved nitrate (0.7 mg/L) dissolved phosphorous (0.16 …
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Carbon Nanotube Behavior in Represntative Old Leachate
… MSW was evaluated by conducting saturated 1-D column experiments.</p> <p>Batch experiments were conducted to evaluate the influence of humic acid (HA) concentrations (20 - 800 mg/L as C), ionic strength (NaCl: 50 - 400 mM), and pH (6, 7 and 8) on the electrophoretic mobility and relative …
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ADSORPTION OF ANTIBIOTICS BY VERMICULITE
… has been studied using batch (static) and column (dynamic) adsorption techniques. The Langmuir and Freundlich isotherm models were initially used to explain the adsorption processes. The separation factor (RL) values derived from the Langmuir model and the 1/n values derived from Freundlich …
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Effect of formulation on the movement of atrazine, alachlor, and metribuzin in a coarse-textured soil
… Plainfield sand was evaluated in field and soil column experiments. Controlled release formulations included starch-based encapsulations of the three herbicides and a commercially available microencapsulation.
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Field and laboratory investigations of solute transport through soil
… included batch or resident concentration column experiments to study degradation processes and to design remediation systems; however, difficulties were associated with these methods such as determination of sorbed concentrations and estimation of effluent concentrations from resident …
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Poly(ethylenimine)-Functionalized Pyroxene Nanoparticles Embedded on Diatomite for Removal of Total Organic Carbon from Industrial Wastewater: Batch and Fixed-bed studies
… wastewater in batch and contenuious fixed-bed column studies under various conditions. Our study includes arrays of characterization techniques for the prepared nanoparticles and for Diatomite (commonly used filter aid) before and after embedding it with the nanoparticles at a very low mass …
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Impact of Porous Media Grain Size on the Transport of Multiwalled Carbon Nanotubes
… on MWNT retention. Results from one dimensional column experiments conducted under various physical and chemical conditions coupled with results of numerical modeling assess the suitability of traditional transport models to predict MWNT mobility. MWNTs were found to be mobile though porous media …
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Evaluation of the Impacts of De-Icing Salts on the Performance of Bioretention Media in Retaining Phosphorus From Urban Stormwater
… salt inputs on P retention by conducting column experiments using three different bioretention media with and without an amendment added. Non-amended columns showed net P release, whereas amended columns showed net P retention. While some non-amended columns showed prolonged salt exposure …
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Transport, Stability, and Deposition of Gold Nanoparticles in Porous Media
… stability of these AuNP would be replicated in column studies. Column experiments with varying monovalent and divalent ion 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 …
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Flow and transport in wetland deposits
… flow in wetland soils. To accomplish this, Column Experiments, run on a specialized permeameter, were conducted on both re-sedimented and undisturbed wetland soil specimens. During these experiments, sodium chloride (NaCl) tracer was injected into the soil specimen, and its breakthrough was …
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Foam-surfactant technology in soil remediation
… However research in this area has been limited. Column experiments were conducted to investigate the factors that limit the use of foam as an agent for soil flushing. Pressure build up in the soil is an important factor that was studied for foam with different characteristics. In addition, the …
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Investigations on mobility of carbon colloid supported nanoscale zero-valent iron (nZVI) for groundwater remediation
… charge and stability of suspensions. In field experiments maximum transport distances of a few metres were achieved. A new approach, which is investigated in this thesis, is enhanced mobility of nZVI by a more mobile carrier colloid. The investigated composite material consists of activated …
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The effect of sea level rise on radionuclide mobility at contaminated nuclear sites
… during sea level rise. Here batch and column experiments were used to simulate and investigate the effect of these processes on the mobilisation of key radionuclides Tc, 90Sr and U from oxic and reduced sediments under sea level rise scenarios. Strontium-90 was rapidly mobilised from …
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The treatability of a munitions-manufacturing waste with activated carbon
… bench-scale packed-bed granular activated carbon column experiments were performed. Test parameters included the removal of nitroaromatic compounds and color. Results show that treatment of the TNT manufacturing waste from Radford Army Ammunition Plant, Radford, Virginia, with activated carbon is …
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Untersuchungsergebnisse zur Mobilität und Remobilisierung von Kupfer und Antimon in wasserwirtschaftlich relevanten, porösen Lockergesteinen durch Säulenversuche und mit reaktiver Transportmodellierung
… of planning, conception and set-up of a column arrangement which served as a model of the sediment-/groundwater system as well as the development of appropriate preparation and sampling techniques. The experimental set-up run was suitable for simulation of groundwater flow with velocities …
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Sorption and degradation of pesticides in biopurification systems
… and major part of this thesis was performed with column experiments, thus incorporating transport of pesticides. Sorption and degradation characteristics of linuron, bentazone, metalaxyl and isoproturon were quantified using inverse modeling techniques present in the transport model HYDRUS-1D. The …
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THE MOBILITY OF ENGINEERED MULTI-WALLED CARBON NANOTUBES IN POROUS MEDIA
… disposal regulations. Results from the 1D column experiments, conducted under a variety of physical/chemical conditions, are used to assess the ability of existing models to predict carbon nanotube transport in porous media systems. This study shows that the mobility of MWCNTs is …
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Comparison of gold extraction yields by cyanide treatment vs. bioleaching procedure
… bacteria, <em>Alcaligenes faecalis,</em> in column experiments to compare the gold recovery yields in the effluents. Four columns were treated with a different liquid: water, bacteria, NaCN and a mixture of cyanide and bacteria. After they were leached the effluents were analyzed to determine …
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