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Showing 1 to 20 of 48 for “"soil columns"”.
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The effects of winter cover cropping on nutrient leaching through repacked soil columns
… ecosystems. This study utilized laboratory-scale soil columns and the one-dimensional water and solute transport model HYDRUS-1D to quantify and understand the potential decrease in nitrogen and phosphorus loss through tile drainage due to cover crops, as well as compare the amount of nitrogen and …
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The Effect of Root Distribution on Water and Nutrient Uptake by Soybean Plants Grown in Soil Columns
Made available in DSpace on 2014-12-10T17:12:45Z (GMT). No. of bitstreams: 1 7000957.pdf: 4014119 bytes, checksum: 499301b9285bf68defa93f43a2a51cf8 (MD5) Previous issue date: 1969
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Characterization of TPH biodegradation patterns in weathered contaminated soil
Two weathered, petroleum contaminated soils were studied to determine if weathered products are amenable to bioremediation and to determine which TPH (total petroleum hydrocarbon) fractions were degrading during particular time frames under different remediation alternatives. Delineation of …
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Groundwater effects of land applied alum residuals
Soil columns of predominantly Peawick and Slagle soils had various amounts of alum residuals, lime and plant nutrients incorporated into the topsoil. A weekly dose of rainwater was applied to each column over a six month period. Leachate and soil constituents were analyzed to evaluate migration of …
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On-site wastewater treatment and disposal systems on reclaimed mined land
… hydraulic performance. In the fall of 1989, topsoil and minespoil materials were transported from southwest Virginia to Blacksburg, Virginia. The soil material was screened, air-dried, and packed into large plastic cylinders. Septic tank effluent and sand filter effluent was applied to the soil …
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A poultry litter marker gene correlates with pathogen and indicator bacteria deposition on, growth in and transport from poultry bedding
… of poultry litter associated microorganisms from soiled poultry litter applied as fertilizer through soil columns under simulated rainfall. First, deposition studies were conducted to evaluate the deposition rate of microorganisms on poultry bedding during the growth of poultry. The studies were …
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Wastewater renovation with soil depth as influenced by additional treatment of septic tank effluent
Many soils are marginally suited for installation of on-site wastewater disposal systems. With soil limitations, additional wastewater treatment prior to soil application may allow for a reduction in soil depth. Undisturbed 20-cm-diameter soil columns (fine loamy, mixed, mesic Typic Hapludult), in …
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Bioremediation of petroleum hydrocarbon contaminated soil
The bioremediation of petroleum contaminated soil in large-scale treatment units was studied in conjunction with Sybron Chemicals Inc., Salem, VA. The soil had been previously contaminated and was spiked with additional petroleum. Water with different characteristics was circulated through the soil …
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Factors Affecting Mobility of Copper in Soil-Water Matrices
… mechanisms that account for the movement through soil to the subsurface. From the factors that may affect this mobility process; TOC, dryness and its temperature cycle and water content of the soil were selected for study. These factors were investigated in both batch and continuous flow (column) …
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Thermal gradients and water transfer in unsaturated soil.
An investigation into the flux of soil water under the influence of a thermal gradient was conducted in closed soil systems in the laboratory. A thermal gradient was imposed across the sandy loam soil columns and measured continuously for the duration of the experiment. The movement of soil water …
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Transport and fate of veterinary sulfonamide antibiotics in soil
… fluxes of pharmaceuticals in the agricultural soils. The main purpose of this study is to investigate the transport processes of veterinary sulfonamide antibiotics (Sulfadimethoxine, Sulfamethazine, and Sulfamethoxazole) in agricultural soils in Haean catchment located in South Korea. In …
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Characterization of Denitrification and Leaching Losses of Fertilizer Nitrogen From Soil (Evolution, Isotope, Nitrous Oxide, Dinitrogen)
… and denitrification losses of fertilizer N from soil requires that appropriate methods be developed for their measurement. The objectives of this work were to: (1) evaluate potential errors in measuring denitrification by use of ('15)N-tracer techniques recently developed for determination of …
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Evaluating post-fire woody mulch effects on soil and stream nitrogen
… Woody mulch is commonly applied to mitigate soil erosion and enhance revegetation post-fire, but it also provides a source of labile carbon (C) that may stimulate microbial immobilization and limit N release from soils. The objective of our study was to evaluate whether mulch application …
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Simulation of concentration effects on mobility and persistence of alachlor
… investigation was divided into two components: soil column study and model study. In the soil column study, PVC pipe was hand packed to a depth of 30 cm with Catlin silt loam soil. The surface of the soil columns was contaminated with alachlor at rates of 3, 30 and 3000 kg a.i./ha. Columns were …
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Soil Salinity Study in Northern Great Plains Sodium Affected Soil
… and sodium (Na) transport in undisturbed soil columns and to develop a remote sensing technique to characterize salinization in South Dakota soils. Fortyeight undisturbed soil columns (30 cm x 15 cm) collected from White Lake, Redfield, and Pierpont were used to assess the chemical …
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Illuminating controls on solute and water transport in the critical zone
… TMX-coated corn seeds in coarse vs fine-textured soil columns maintained with versus without growing corn plants. Fine-textured soil transported TMX at concentrations that were two orders of magnitude higher than coarse-textured soil, due to preferential flow in the fine-textured soil columns and …
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Efficiency of soil aquifer treatment in the removal of wastewater contaminants and endocrine disruptors. A study on the removal of triclocarban and estrogens and the effect of chemical oxygen demand and hydraulic loading rates on the reduction of organics and nutrients in the unsaturated and saturated zones of the aquifer.
… was carried out to evaluate the performance of Soil Aquifer Treatment (SAT) under different loading regimes, using wastewater of much higher strength than usually encountered in SAT systems, and also to investigate the removal of the endocrine disruptors triclocarban (TCC), estrone (E1), …
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Microbial and Chemical Affects on Leachate from Calcareous Soils Treated with Wastewater Effluent
… natural and artificially constructed calcareous soils in greenhouse and field lysimeters, and in soil columns. The leachate from one field lysimeter contained increased fecal coliform counts than the effluent. Leachate coliform counts were decreased or not significantly changed in two field …
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Method development and application for measuring representative & potential denitrification rates during wastewater reclamation in soil treatment units
… utilizing a septic tank connected to a soil treatment unit. Although soil treatment units provide significant removal of many contaminants such as suspended solids, pathogens and organic content; mass loading of nitrogen remains a top concern. Previous research focused on quantifying and …
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Multiphase immiscible flow through porous media
… model is developed for multiphase flow through soil involving three immiscible fluids: namely air, water, and an organic fluid. A variational method is employed for the finite element formulation corresponding to the coupled differential equations governing the flow of the three fluid phase …
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