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 61 for “"Electrical Conductivity (EC)"”.
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Brine Spill Remediation: Crestwood Pipeline, McKenzie County, North Dakota
<p>Electrical Conductivity (EC) analyses of soil samples collected at a coproduced brine spill site near Mandaree, McKenzie County, North Dakota suggest that the site has been remediated. Five soil samples were taken from the area 12 inches below the ground surface. In the lab the saturation …
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Microbial and Chemical Affects on Leachate from Calcareous Soils Treated with Wastewater Effluent
… United States. To determine the potential effects of using secondary effluent for irrigation, we applied wastewater effluent and irrigation waters to natural and artificially constructed calcareous soils in greenhouse and field lysimeters, and in soil columns. The leachate from one field …
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Determining a Total Dissolved Solids Release Index from Overburden in Appalachian Coal Fields
… industry has been very successful in developing technologies to identify, handle, treat and isolate potentially acid-forming overburden materials at coal mines in the region. However, the techniques to predict acid mine drainage potential may not adequately predict the release of total dissolved …
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Optimizing Hydroponic Lettuce Yield: Evaluation of Potassium Source and Concentration with Plant Imaging
… Lettuce (Lactuca sativa) possesses considerable economic importance as one of the foremost leafy vegetables worldwide in terms of financial value for production in CEA. Rapid growth rate, high yield, and potential return further enhance its suitability for cultivation within CEA. Pursuing optimal …
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Criteria signaling reapplication of controlled-release fertilizer for maximum growth of Ilex crenata Thunb. 'Helleri'
Medium solution N and electrical conductivity (EC), and foliar N levels were measured to determine criteria which signal the need for reapplication of a controlled-release fertilizer (CRF) in order to maximize growth of container-grown Ilex crenata Thunb. ‘Helleri’. Rooted cuttings of ‘Helleri’ …
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Physical and chemical properties of coarse coal refuse from Southwest Virginia
Coarse coal refuse is difficult to reclaim due to high potential acidity and coarse fragment content, low water holding capacity, low fertility, and other problems. Little is known about coal refuse properties, particularly as they relate to revegetation potential. This study was undertaken to …
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Effect of Various Saturation Levels, Leaching Solution pH, and Leaching Cycle on Electrical Conductivity from Coal Mine Spoil Leachate
… surface mines focused 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 …
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Determination and assessment of procedures of the pour-through nutrient extraction procedure for bedding flats and plug trays
… bedding flats and plug trays. The Pour-through technique involves pouring a prescribed volume of water on a recently irrigated medium, then collecting and analyzing the leachate to predict nutrient availability in the medium. The volume of water necessary to collect a Pour-through from a 1204 …
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Characterizing the Impact of Freshwater Salinization on Engineered Ecosystems: Implications for Performance, Resilience, and Self-Repair Through Phytoremediation
… plants. However, during winter, these basins receive saline runoff from road salt application, which contributes to Freshwater Salinization Syndrome (FSS). Since limited research has connected direct measurement of soil and stormwater salinities to biodiversity and phytoremediation potential of …
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Development of an acid mine drainage treatment technology and recovery of minerals
… sources. There is need for development of a technology which treats and recover beneficial minerals from AMD. Samples of AMD, water, sediments from the field and sludge from neutralization batch experiments were characterised for their chemical compositions using advanced research techniques. …
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Investigating Subsurface Flow Delivery to a Small High Arctic River
… being shown to possess similar delivery mechanisms, however the topic is understudied, acutely so in the High Arctic. This work assesses the nature of delivery mechanisms in the High Arctic over the thaw season and in response to rainfall at the Cape Bounty Arctic Watershed Observatory …
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Development of instrumented oedometer incorporated with bender element and electrical conductivity
… and fine-grained particles possessing poor geotechnical properties such as low shear strength and high compressibility. Solidification, using hydraulic binders could be adopted to improve these poor properties. The compressibility of soil is quantified by the settlement reduction due to the …
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Characterisation of groundwater in mainly old and closed landfill sites
… and were not designed with environmental protection in mind. Boreholes were tested for methane, carbon dioxide and groundwater samples were analysed for electrical conductivity (EC), ammonium nitrogen (NI14-N), COD, TOC, Cl-, NO3, SO42-, Na+, K+, Ca2+, Ni2+, Cu2+, Pb2+, oxidation - reduction - …
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Effects of soil texture, soil depth, and treatment on septic tank effluent renovation
This study compared the effects of soil texture, soil depth, and additional treatment, by constructed wetland (CW) and recirculating sand filter (RSF) systems, on wastewater renovation in a texture group 2 (loam) and a texture group 3 (clay loam) soil. The soils with depths of 15, 30, and 45 cm …
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Mine soil properties influencing white pine (Pinus atrobus L.) growth in Southwest Virginia
… properties influencing white pine growth on reclaimed mine sites in southwest Virginia. PRESSAll (SAS Views, 1984) was used to determine relationships between soil properties and growth, soil properties and functional environmental factors (plant moisture stress and foliar nutrients), and …
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SOIL SALINITY AND SODICITY OF GALVESTON AND PELICAN ISLANDS, TEXAS
<p>Galveston Island, Texas, is frequently affected by hurricanes. In 2008, Hurricane Ike inundated much of the island with seawater, causing elevated soil salinity levels that killed much of the vegetation on the island, including tens of thousands of trees. Residual salinity in soils and …
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Spatial Variability of Saline and Sodic Soils in the Black Glaciated Region of the Northern Great Plains, USA
<p>Recent (1990-2014) increases in salt affected soils in the Northern Great Plains states of South Dakota (SD) and North Dakota (ND), MLRA 55B and 55C, have prompted more intensive research on groundwater derived saline and sodic soil characteristics in semi-humid and humid climates. Past research …
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Assessment of the Quality of Domestic water in Kinondoni District, Dar es salaam, Tanzania
… wards in Kinondoni District, Dar es Salaam. Objectives were: (i) to determine levels of fecal and total coliform bacteria in domestic water supplied from private wells (boreholes) and water trucks, and compare these with the Tanzania Drinking Water Standards of 2008; (ii) to assess the physical …
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Hydroponic and Soilless Culture Systems and Transplant Practices Influence Production of Basil (Omicum basilicum L.)
… and transplant date into hydroponic culture effects on basil growth and yield at harvest. For the first experiment, four basil cultivars (‘Genovese’, ‘Mrs. Burns Lemon’, ‘Sweet Thai’, and ‘Cinnamon’) were grown in deep flow technique (DFT) hydroponics, nutrient film technique (NFT) hydroponics, …
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Soil Salinity Study in Northern Great Plains Sodium Affected Soil
… the salinization and sodification risks. The objectives of this dissertation were to compare three chemical amendments (calcium chloride, sulfuric acid and gypsum) remediation strategies on water permeability and sodium (Na) transport in undisturbed soil columns and to develop a remote sensing …
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