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 11 of 11 for “"Particulate iron"”.
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The performance of free chlorine and chlorine dioxide oxidation and/or alum coagulation for the removal of complexed Fe(II) from drinking water
Past research regarding complexed iron has focused on the resistance to and kinetics of oxidation by O₂(aq) and the extent of stabilization. The 0.45 um filter was typically used to differentiate between dissolved and particulate iron. This research investigated Fe(II) oxidation by free chlorine …
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The performance of potassium permanganate and hydrogen peroxide oxidation and/or alum coagulation in the removal of complexed FE(II) from drinking water
… and H20 2 oxidation. The differentiation between particulate, colloidal, and soluble iron species was achieved through the use of 0.2 urn filters and 100K ultrafilters. Results from oxidation and ultrafiltration studies indicated incomplete complexation of the Fe(II) by DOC in solution. Following …
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Iron biogeochemistry in the waters surrounding the Crozet Islands, Southern Ocean
… was to improve our understanding of the natural iron fertilisation processes<br/>that can alleviate the High Nutrient Low Chlorophyll conditions normally associated with the<br/>Southern Ocean. The annual phytoplankton bloom occurring north of the Crozet Plateau (46°26’S<br/>- 52°18’E) provided a …
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Hydrological and biogeochemical cycling along the Greenland ice sheet margin
… cycling in terms of export of carbon and iron from the Greenland ice sheet. I develop a new isotope mixing-model to quantify water source contributions to the bulk meltwater discharge draining a GrIS outlet glacier. Results illustrate (a) the new application of a naturally occurring …
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Hydrological and biogeochemical cycling along the Greenland ice sheet margin
… cycling in terms of export of carbon and iron from the Greenland ice sheet. I develop a new isotope mixing-model to quantify water source contributions to the bulk meltwater discharge draining a GrIS outlet glacier. Results illustrate (a) the new application of a naturally occurring …
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Impact of atmospheric cycling on the release of iron and manganese into seawater from Saharan soil particles
Atmospheric transported dust is a major source of iron, manganese and other nutrients to the ocean. During atmospheric transport, dust containing iron and manganese undergoes cloud processes that can increase the reactivity and solubility of iron and manganese species when they enter into seawater. …
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Role of Chloride in Galvanized Iron Plumbing Corrosion and the Use of Fingerprinting Methods to Identify Water Lead Sources
… this change could be problematic for galvanized iron pipe (GIP) installed in consumers' homes and buildings. The higher levels of chloride might increase the rate of galvanic corrosion between the sacrificial zinc coating and the underlying iron (steel) pipe. There are also concerns that the iron …
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Lead and Copper Contamination in Potable Water: Impacts of Redox Gradients, Water Age, Water Main Pipe Materials and Temperature
… of pipes, faucets, and fixtures. The US Environmental Protection Agency Lead and Copper Rule (LCR) is intended to target sampling at high-risk sites to help protect public health by minimizing lead and copper levels in drinking water. The LCR is currently under revision with a goal of better …
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Phosphate use for Sequestration, Anti-Scaling, and Corrosion Control: Critical Review, Simultaneous Optimization of Polyphosphate Dosing, Sequestration Mechanisms, and Stabilization of Magnesium Silicate Scale
… used by drinking water utilities to 1) reduce iron/manganese aesthetic problems by sequestration, 2) inhibit calcium carbonate scale formation via threshold inhibition, and 3) reduce corrosion of pipes by forming protective pipe scales. Orthophosphates can control lead, copper and iron …
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Practical Application of NSF/ANSI 53 Lead Certified Filters: Investigating Lead Removal, Clogging and Consumer Experience
… synthesized waters with 150 μg/L of soluble and particulate lead. In Flint, as in Washington, there were initial concerns that the filters would not be effective when exposed to lead levels far above the NSF/ANSI 53 150 μg/L Pb level used for certification. However, the EPA conducted a 2016 study …
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The seasonal cycling and physico-chemical speciation of iron on the Celtic and Hebridean shelf seas
Shelf seas represent an important source of iron (Fe) to the open ocean. Additionally, shelf seas are highly productive environments which contribute to atmospheric carbon dioxide drawdown and support large fisheries. The work presented in this thesis describes the seasonal cycle of Fe in the …