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 46 for “"Metal removal"”.
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E -commerce for the metal removal industry
<p>The popularity of outsourcing fabrication introduces a problem, namely an inevitable loss of data as information is translated from design to fabrication or from one system to another. Unsatisfactory information, delivered to the outsourcing facility, and inefficient communications between …
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Heavy metal removal from bilge water by electrocoagulation treatment
… purpose of this research was to observe the removal efficiency for copper (Cu), nickel (Ni), and zinc (Zn) using Electrocoagulation (EC) technique in a continuous flow reactor with a synthetic bilge water emulsion; and additionally, to discuss the operation cost of the treatment. The optimal …
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LOW IMPACT DEVELOPMENT MIXTURE EVALUATION FOR HEAVY METAL REMOVAL
To address non-point heavy metal pollutant sources to urban stormwater runoff, the LIDMATTM (Low Impact Development MAT) is a stormwater management runoff system designed and manufactured for effective treatment for heavy metals. The LIDMATTM contains approximately 70% sand, 25% manure compost, and …
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Design of High Efficiency Fibers for Ion Exchange and Heavy Metal Removal
… substrate, for the purpose of arsenite (As3+) removal from water. Physical/chemical aspects of naturally occurring thiols and disulfides was used to draw parallels to observations found with the polyvinyl alcohol mercaptyl system and its reactivity towards arsenite. The ability of these systems …
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Permeable Reactive Concrete For Enhanced Heavy Metal Removal With Optimization Of Individual Components
Catastrophic release of heavy metals in Colorado, U.S or Minas Gerais, Brazil exposed the importance heavy metal contamination have on the surrounding peoples and environment. Permeable reactive barriers (PRBs) are an effective method of remediation the use a reactive media to passively remove …
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EFFECTS OF COMPLEXATION WITH THE SIDEROPHORE DESFERRIOXAMINE B ON TRANSITION METAL REMOVAL FROM SEAWATER
Complexation of transition metals with strong organic ligands of unknown structure and origin plays an important role in their behavior and distributions in seawater. I present here a series of stability constants for complexes of several transition metals with the trihydroxamate siderophore …
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Integration of Metal-Organic Frameworks with Electrospun Fibers for Heavy Metal Removal and Carbon Dioxide Capture
… contamination of water sources with toxic heavy metals represent two of the most pressing environmental challenges of the 21st century. Efficient and scalable materials capable of capturing CO2 and removing pollutants such as Pb(II) and Cu(II) are urgently needed to mitigate climate change and …
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Synthesis and characterisation of low-cost biopolymeric/mineral composite systems and evaluation of their potential application for heavy metal removal
Heavy metal pollution and waste management are two major environmental problems faced in the world today. Anthropogenic sources of heavy metals, especially effluent from industries, are serious environmental and health concerns by polluting surface and ground waters. Similarly, on a global scale, …
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Mechanisms of lead and zinc removal from lead mine drainage in constructed wetland
… due to lack of detailed knowledge about metal removal mechanisms. This research has studied individually the chemistry of the major removal mechanisms and generated the parameters describing the reactions involved in metal removal in constructed wetlands, which can be used to combine …
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The influence of abrasive surface topography on the basic mechanics of the metal grinding process
… topography on the actual mechanics of the metal removal process. The characterisation of abrasive surfaces using statistical properties of the cutting profile is discussed. A study is undertaken which examines the influence of abrasive grit geometry on the mode of metal deformation. In …
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Nanotechnology and Biotechnology for Water Treatment: A Comparative Study
… For instance, chemical precipitation for heavy metal removal is effective only when the metal concentration is low; while other methods require long contact times, are ineffective at low metal concentrations between 1-100 mg/L, and are, in most cases, expensive because they require energy or …
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Application of carbonated calcium silicate materials in metal sorption processes
… Batch sorption experiments demonstrated better metal removal efficiencies by carbonated cement, particularly for cadmium and cesium. It was concluded that the metal removal mechanisms ranged from adsorption (e.g. ion-exchange, complexation, isomorphic substitution) to surface and bulk …
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The mechanics of power hacksawing and the cutting action of blunt tools
… <p>Process parameters which influence the metal. removal rate during power hacksawing have been identified and thus a detailed explanation of the basic sawing mechanism-suggested. Power hacksaw machine characteristics have also been investigated.</p> <p>The problem of blade testing is …
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Characterization and remediation of toxic metals in wastewater reuse for agricultural irrigation
… food products. Common contaminants include toxic metals, which are conservative within the soil-plant-water system. While conventional treatment of these waste streams is possible the treatment is resource intensive leaving it beyond the reach of many developing nations. Inventory of metals in the …
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Arsenic and Selenium Distribution in Coal-Fired Plant Samples
… goal being to examine the distribution of these metals in these materials and calculate a materials balance for the system. All samples were analyzed using ICP-ES. This research shows that 60-80% of the arsenic in coal-fired plant samples will be associated with the fly ash. Approximately 35-55% …
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Fate and Treatability of Engineered Nanoparticles in Urban Stormwater
… particle size distribution, it was noticed that metallic ENPs tend to aggregate initially, while extended turbulence in the system leads to disaggregation. Stormwater samples with added ENPs exhibited larger particles than those in stormwater without added ENPs. The effects of n-Ag were explored …
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Approaches for chatter reduction in deep cavity and intricate surface milling
The goal of the project was to increase the metal removal rate or improve the surface quality of an intricate surface cut by a long overhang tool. The results of the metal cutting tests show that the surface quality of a finish cut at conventional milling speeds can be improved by approximately 50% …
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Precipitation of nickel and cobalt sulphides using different reactor configurations
… unreacted dissolved nickel and cobalt. Removal of these metals to optimum levels is desired, however, the product should also be easy to handle and the process easy to incorporate into the current system. There are various precipitation agents that can be used to remove metals from …
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Removal of Heavy Metals Using Modified Limestone Media: Zinc and Cadmium
<p>Heavy metal contamination is a serious concern throughout the world. Increased concentrations in drinking water have many negative impacts on human health. Limestone is an inexpensive and simple media for removing high concentrations of heavy metals from drinking water supplies. Ferric based …
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The effect of tooth geometry on power hacksaw blade performance.
… chip flow by the gullet causes very inefficient metal removal. This is supported by examination of hacksaw chips, and a theoretical model has been developed to show how rapidly cutting forces increase when the chip is restricted from flowing. Two testing procedures have been developed to examine …
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