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 17 of 17 for “"Drainage waters"”.
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Passive detection of phosphorus in agricultural drainage waters using reactive hybrid anion exchange resins
… are needed to identify specific fields and or watersheds that are major contributors of P loss. A passive detection technique can be ideal for the monitoring of concentrations and loads of dissolved reactive P (DRP) from a large number of agricultural waterways because of its simplicity and …
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A one-step ambient temperature ferrite process for treatment of acid mine drainage waters
Acid mine drainage (AMD) waters are low in pH, very high in dissolved iron, high in non-ferrous (mainly heavy) metals and very high in sulphate salinity. As such, AMD waters present a serious environmental problem in the mining regions of South Africa and elsewhere in the world. Treatment of AMD …
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Multifunctional experimental assessment in a newly established Mediterranean restored marsh : marsh elevation, carbon accumulation and pollutant concentration reduction
… riverine irrigation water (IW) and rice field drainage water (DW) and three water levels (10, 20 and 30 cm depth). The results indicate overall benefits of the restored marsh providing marsh elevation, C accumulation and pollutant removal services. This study indicates that Mediterranean …
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Biofilms as sources of fecal bacteria contamination in the stormwater drainage system in Singapore
… originating from within the stormwater drainage system in Singapore. The extent of fecal bacteria presence in storm drain biofilms was evaluated as a pathway for fecal bacteria contamination. In the research, biofilms were evaluated as reservoirs for fecal indicator bacteria (FIB), FIB …
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The impact of plantations of Pinus spp. on the chemical properties of soils and stream waters in South African upland catchments
… result in a significant transfer of acidity to drainage solutions and consequently to associated surface waters has, to a large extent, been discounted due to the self-limiting nature of " natural" acidification processes which purportedly do not involve significant concentrations of the strong …
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Challenges and Opportunities for Denitrifying Bioreactors in the Mid-Atlantic
… widespread nutrient pollution in agricultural drainage waters necessitate cost-effective, adaptable, and reliable solutions. In this context, enhanced denitrification approaches developed over the last several decades have produced denitrifying bioreactors that harness the ability of ubiquitous …
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An investigation of heavy metal tolerance and reproduction in Nereis diversicolor with reference to their use for biomonitoring
… for contamination of coastal and estuarine waters. All stages of metal production are sources of contamination, the main contributors being acidic mine drainage waters and smelting works. Other major sources are industrial water discharges, sewage sludge, the atmosphere, shipyard paints and …
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AMINO ACIDS AS DIAGNOSTICS OF SOIL AND SOIL WATER QUALITY
… and combined (DCAA) amino acids in natural waters at picomolar concentration. These methods were used to examine the content of amino acids and their distribution patterns in waters from 3 different settings. Firstly, field-sized lysimeters (1 ha) were used to examine dissolved free and …
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Environmental and efficacy studies of a chromated fluoride wood preservative
… found around remedially treated field poles. The drainage waters of the control unit contained fluoride and total chromium concentrations which were frequently significantly lower than those concentrations found in leachates collected adjacent to treated timbers but compatible with values from …
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Long-term Effects of Broiler Litter Application Rate on Runoff, Leaching, and Soil Respiration from a Captina Silt Loam
… enter surface or groundwater via runoff or drainage. Additionally, BL applications stimulate carbon dioxide (CO2) release from the soil to the atmosphere and may contribute to global warming. The objectives of this study were to determine long-term trends in runoff and soil leachate water …
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The relation of soil characteristics and chemical constituents of soil solutions to the self corrosion of underground lead cable
… are the presence of organic matter and poor drainage. When organic matter decomposes the resulting organic solids, mainly acetic, attack the cable sheath with resulting corrosion products. Moisture, up to a certain point, is very detrimental, not only in aiding electrolysis, but by causing …
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Evaluation of A Small In-Stream Constructed Wetland in North Carolina's Coastal Plain
… surface area be at least 1% of the contributing watershed size. Most urban areas are severely limited with regard to availableland areas for wetland creation, thus, to be practical, smaller wetlandswill be necessary in many locations. This research involved a two year study to quantify impacts of …
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Hydrochemical Dynamics Under Differing Winter Climate Regimes at the Hubbard Brook Experiment Forest
… two-phase study of the hydrochemical dynamics of drainage waters at the Hubbard Brook Experimental Forest (HBEF) in New Hampshire, USA, that aims to improve understanding of changes in water quality associated with winter climate variation. The first phase was an analysis of the long-term stream …
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Phosphate stabilisation of partly oxidised, polyminerallic mine wastes
… and sulphate into local surface and ground waters. This process is known as acid mine drainage and is considered the most important environmental problem currently facing the mining industry. Phosphate induced stabilisation has been used to create passive iron phosphate coatings on pyrite …
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Characterisation of Schwertmannite - Geochemical Interactions with Arsenate and Chromate and Significance in Sediments of Lignite Opencast Lakes
… of sulphide weathering in acidic, sulfate-rich waters. In order to investigate the environmental importance of schwertmannite, geochemical and mineralogical methods were applied in field- and laboratory-experiments. Thereby this thesis focussed on two consequential questions: The first (1) was …
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Carbon dosing of denitrifying bioreactors to remove nitrate from agricultural drainage
… of a pilot-scale (58 m³) bioreactor treating drainage waters from a 0.65 ha paddock on a dairy farm. The effects of carbon dosing on the bioreactor's nitrate removal rates were assessed following a constant dosage of 8% (v/v) methanol solution at 10 mL min⁻¹ to the bioreactor's inlet …
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Quantifying texture for acid rock drainage characterisation and prediction
… problems. One of these is acid rock drainage (ARD), which forms through a complex series of acid formation (mainly via sulfide oxidation), neutralisation (primarily by carbonates) and gangue mineral dissolution reactions in waste rock and tailings storage piles. The resulting drainage …