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Showing 1 to 20 of 37 for “"Column Studies"”.
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Evaluation of spray irrigation as a methodology for on-site wastewater treatment and disposal on marginal soils
… field sites with soil limitations, supported by column and laboratory studies, were used to evaluate spray irrigation as an alternative methodology for onsite wastewater treatment and disposal. The first site was located in Montgomery Co., VA on a Chilhowie soil (very-fine, mixed, mesic Typic …
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Compost Bioreactors for Removing Agricultural Chemicals From Tile Drainage Water
… for its capacity to promote denitrification in column studies. The extent of nitrate removal depended on the solid retention time, but could also have been influenced by the amount of compost in the column that could be utilized as an energy source by denitrifying microorganisms. The results of …
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Remediation of acid mine drainage using natural zeolite
… These include, equilibrium tests, batch kinetic studies, column studies and desorption studies. Equilibrium studies showed that the capacity of natural zeolite for heavy metals increased with an increase in initial solution pH. Fitting of the Langmuir and Freundlich isotherms to experimental data …
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Effects of Sulfide and pH on Microbial Sulfate Reducing Efficiency
… lower sensitivity to sulfide. Two types of studies were undertaken. First, long-term column studies were utilized that employed five rock-filled columns. Second, 21-day static bottle studies were utilized to examine the effect of removal of sulfide by purging with nitrogen gas on the ability …
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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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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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Removal of silver and mercury from COD waste solutions
… from COD waste solutions. Batch equilibrium studies were conducted to determine ion exchange selectivity of several commercial and regenerated resins. Resin capacity and metal ion recovery efficiency were evaluated in continuous-flow column studies. Solubility studies were included to …
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Investigating nitrate-dependent humic substance oxidation and in-service K-12 teachers' understanding of microbiology
… where they are degraded; however, previous studies have shown that some microorganisms are capable of utilizing humic substances as electron acceptors and electron donors in anaerobic respiration. Even though there have been humic-reducing and humic-oxidizing microorganisms isolated and …
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Surfactant enhanced mobilisation of non-aqueous phase liquids
… concentration on the removal of a residual NAPL. Column studies were conducted to investigate the relative flushing efficiencies of very dilute Triton X-100 solutions delivered through Ottawa sand spiked with light white mineral oil. At the higher flow rate, the surfactant solutions yielded N T …
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Effect of Various Saturation Levels, Leaching Solution pH, and Leaching Cycle on Electrical Conductivity from Coal Mine Spoil Leachate
… on acid mine drainage and reclamation. Recent studies suggest that electrical conductivity (EC) levels above 500 ?S cm-1 can impair Appalachian streams, shifting the focus towards limiting release of total dissolved solids (TDS) and associated elements of concern. Previous column studies …
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Development of a Novel Perfluoroalkyl Substance Sequestration Scheme Using Alginate Macrobeads and Common Water Treatment Polymers
… and cationic polymer. Finally, sand and soil column studies were used to assess the behavior of beads containing polyDADMAC and the transport potential of PFOS in a dynamic environment with sorption enhancer present. PolyDADMAC exhibited little retention on Ottawa sand but significant …
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The Effects of Manganese-Reducing Bacteria on Desorption of Manganese from MnOx(s) Coated Media
… and environmental samples. Bench-scale filter column studies were completed to investigate the impacts of Mn-reducing microbial populations on desorption of Mn from MnOx(s) coatings. Secondarily, the effects of influent carbon loading and MnOx(s) age on Mn desorption were investigated. In situ …
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The Role of Aluminum within MnOx(s)-Coated Filtration Media in Drinking Water Treatment
… analyzed by conducting a series of bench-scale column studies, treatment plant data collection, and analysis of the MnOx(s) surface utilizing an electron microscope. The results confirm that Al deposits onto the MnOx(s) media surface by two separate mechanisms; adsorption of dissolved Al species …
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Sorption and release of dissolved pollutants via bioretention media.
… sorbent materials is discussed. Batch and column experiment were performed to investigate the removal of cadmium, copper, and zinc form synthetic stormwater by compost-amended sand. The results of these experiments are discussed in Chapter 2. The batch sorption capacities for Cd and Zn are …
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A poultry litter marker gene correlates with pathogen and indicator bacteria deposition on, growth in and transport from poultry bedding
… in the U.S. and litter disposal practices. Two studies were conducted during this research: (1) to determine the temporal rate of deposition and growth or decay of microorganisms in poultry litter originating from poultry feces and (2) the release and transport of poultry litter associated …
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Bioremediation of chlorinated ethanes and ethenes in vertical flow engineered wetland systems
… systems were investigated in microcosm and column studies. Experiments on environmental and biogeochemical factors that affect system performance were conducted, and a numerical model involving advection, sorption, and sequential biodegradation was developed to describe the fate and …
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Removal of Nitrates from Stormwater Using Nanoclays
… significant additional benefits to the clays. Column studies were also conducted on the most successful clay, pre-modified trimethyl stearyl ammonium nanoclay, to assess the breakthrough point when 0.1% w/w and 1% w/w of the nanoclay were added to Nevada Sand. The results showed a projected …
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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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Extractant Impregnated Membranes for Cr(III) and Cr(VI)
… O and 76.3% C, 19.3% O, 4.4% P, respectively. Column studies under simulated groundwater conditions utilizing the extractant impregnated membranes showed no statistical difference in Cr(VI) recoveries from those obtained in batch experiments. Cr(III) extraction revealed a statistical difference …
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