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 25 for “"zero-valent iron"”.
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Hydrogen Gas Production and Effects During Remediation Using Nano-scale Zero-valent Iron
… of hydrogen gas (H2) exsolution during nanoscale zero-valent iron (nZVI) groundwater remediation applications. An improved understanding of gas exsolution and its effects can be applied to remediation technologies that produce gas in excess of solubility limits, including bioremediation and nZVI. …
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Reaction Rates For The Dehalogenation Of Trichloroethylene Using Various Types Of Zero-valent Iron
… their toxicity and their persistence in the environment. Iron has been used extensively in the past decade as a subsurface reactive agent for the remediation of dense, nonaqueous-phase liquids (DNAPLs). Permeable reactive barrier walls (PRBW) have been installed at many sites around the country …
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Comparision of zero-valent iron and activated carbon for treating chlorinated contaminants in groundwater
… Institute of Technology, Dept. of Civil and Environmental Engineering, 1998.
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Investigations on mobility of carbon colloid supported nanoscale zero-valent iron (nZVI) for groundwater remediation
Injection of nanoscale zero-valent iron (nZVI) is an innovative technology for in situ installation of a permeable reactive barrier in the subsurface. Zerovalent iron (ZVI) is highly reactive with chlorinated hydrocarbons (CHCs) and renders them into less harmful substances. Application of nZVI …
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Combination of zero-valent iron and granular activated carbon for the treatment of groundwater contaminated with chlorinated solvents
… Institute of Technology, Dept. of Civil and Environmental Engineering, 1996.
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Degradation of groundwater contaminants by iron containing systems.
Iron-containing systems are effective at reducing common groundwater contaminants. Zero-valent iron particles are an effective remediation technology for groundwater contaminated with halogenated organic compounds. Iron salts were used to generate iron oxide nanoparticles, which were reduced to …
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Reaction condition effects on Re(VII) sorption kinetics at the zerovalent iron-water interface
… This study evaluated the reducing capacity of zero valent iron (ZVI) as a potential reducing agent in the CWT. Using perrhenate (Re(VII)O4-) as a chemical analogue for 99Tc(VII)O4-, batch Re(VII) sorption experiments were conducted in ZVI as a function of pH (8.2-10.2) and nitrate concentration …
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In Situ Remediation Of Heavy Metal Contaminated Sediments Using Emulsified Zero-valent Metal Particles
… cadmium from saturated spiked soils. The use of zero-valent metal particles, particularly those of zero-valent iron (Fe0), as an in situ remediation technique, is currently undergoing evaluation. The basic mechanism for removal appears to be reduction of contaminant metals followed by the …
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Continued optimization of a microelectrolysis treatment process for removal of arsenic from landfill gas condensate, characterization of materials, and evaluation of Fe as a predictor of treatment monitoring
… (ME) treatment that uses a combination of zero-valent iron (ZVI) and granular activated carbon (GAC). This study compared the performance of alternative types of ZVI/GAC media and examined effects of other treatment variables including pH, agitation methods, and media cycling. This study …
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Enhanced Dechlorination of 1,2-Dichloroethane by Coupled Nano Iron-Dithionite Treatment
… was also achieved using magnetite and iron sulfide as the metal surface, with kobs values of 6.2 x 10-3 and 4.7 x 10-3 day-1, respectively. Characterization analysis of the nZVI/dithionite nanoparticles shows that zero valent iron as such remains in solution after more than one year of …
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Advanced oxidative wastewater treatment using cavitational reactors
… a modified classic Fenton reaction which uses zero valent iron catalysts (instead of iron salts) and hydrogen peroxide under acidic conditions was studied. This process, named the advanced Fenton process (AFP), is the main foundation of the phenolic wastewater treatment reported in this thesis. …
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Impact of metallic nanoparticles on anaerobic digestion
… applied in various consumer products while nano zero valent iron (NZVI) has been proposed for site remediation and industrial wastewater treatment. In batch anaerobic digestion systems, AgNPs at the concentration of 40 mg/L did not inhibit methane production, as more than 90% of AgNPs were …
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Novel treatment technologies for arsenic removal from water
… can have a significant adverse impact on the environment. Arsenic pollution in water has been found in many parts of the world, especially in developing countries such as Bangladesh, India, Nepal, and Vietnam. It is also detected in some areas of Australia. In rural area of Victoria, arsenic …
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Removal of Per- and Poly-fluoroalkyl Substances (PFAS) from Water: A Computational Approach
… synthetic compounds widely detected in the environment due to the exceptional stability of the carbon–fluorine bond, posing significant risks to human health and ecosystems. This dissertation develops a multiscale framework for PFAS remediation and detection by integrating ab-initio …
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Abiotic nitrate reduction by redox activated iron-bearing smectites
… to chronic human illness and a variety of environmental problems, including hypoxia in coastal waters. Previous work has shown that nitrate is naturally removed from soils below the redox interface of the soil profile. A lack of denitrifying bacteria in the studied profiles points to an …
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Hydraulic and Electrokinetic Delivery of Remediants for In-situ Remediation
Nano-scale zero valent iron (nZVI) has shown promising mobility and in-situ reactivity with chlorinated volatile organic compounds when injected into saturated porous media. The current study evaluated nZVI mobility and subsequent reactivity with in-situ contaminants in a variably saturated porous …
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The remediation of tributyltin-contaminated dredgins and waters
… is a pollutant, mainly introduced to the environment as a marine anti-fouling agent. The aim of this work was to assess and develop sustainable and cost-effective remediation technologies for TBT-contaminated dredged materials. For this purpose, analytical methods were developed for sediments …
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Effects of Microbial Community Stress Response and Emerging Contaminants on Wastewater Treatment Plants
… using silver, titanium dioxide, ceria, and zero valent iron nanoparticles. Silver nanoparticles were found to enhance trihalomethane formation, which was attributed to the citrate coating of the nanoparticles. These studies both raise concern over the relationship between engineered …
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Forecasting groundwater contaminant plume development using statistical and machine learning methods
… model for a focus area downgradient of a zero-valent iron permeable reactive barrier was developed to generate a detailed, synthetic carbon tetrachloride concentration dataset that was input to two forecasting models, Prophet and the damped Holt's method. By increasing the temporal …
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