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Desorption Of Copper From Illite Clay Using A Chelating Resin Encapsulated Between Porous Membranes, John Leonard Plude

Doctoral Dissertations

Toxicity studies have established the need for information concerning species distribution of heavy metals in the environment. In aquatic environments, the nature of trace metals, whether free, adsorbed, or complexed controls impact on biota. Often, major portions of the trace metals present in an aquatic system are immobilized on suspended particulates. Changes in environmental conditions such as pH, soluble ligand concentration and type, and concentration of suspended particulate material in the water column, can affect speciation of a metal. Filter feeding organisms are especially susceptable to these environmental changes. High bioconcentrations of trace metal species which are available to organisms …

Phosphate Adsorption And Desorption On Two Contrasting Soils Used For Land Treatment Of Wastewater, Stephen Arthur Gasiorowski

Doctoral Dissertations

Land treatment of wastewater involves the use of plants and the soil to remove unwanted constituents. Removal of phosphorus is particularly important to avoid excessive biological activity in water systems receiving the treated wastewater. This research examines the phosphate adsorption - desorption behavior of two soils: Charlton silt loam, a typical acid soil from New England which is being used in experimental wastewater treatment, and Tujunga coarse sandy loam from a wastewater land treatment facility located at Manteca, California, which has failed to remove phosphate from wastewater efficiently.

The effects of changing the pH and phosphate content of municipal wastewater …

The Influence Of Fulvic Acid On Copper(Ii), Cadmium(Ii) And Zinc(Ii) Removal From Drinking Water By Alum Coagulation And Copper(Ii) And Cadmium(Ii) Complexing Capacity Measurements Of Fulvic Acid And Natural Freshwater Samples By Dialysis Titration, Ralph Edward Truitt

Doctoral Dissertations

The metal ion complexing chemistry of organic ligands commonly found in drinking water sources is the object of the studies in this dissertation. These ligands, called humics as a class, were modelled in some cases by a soil-derived humic material called fulvic acid. The role of natural humics in the transport and speciation of dissolved metal ions in drinking water sources, particularly health hazards like Cd('2+), is investigated. Some properties of soil-derived fulvic acid (SFA) were also elucidated.

One study modelled a drinking water clarification and decolorizing process using aluminum hydroxide coagulation to measure Cd('2+), Zn('2+) and Cu('2+) removal from …