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 34 for “"contaminant removal"”.
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EDTA-enhanced metal contaminant removal from soils by electric fields
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
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Microbial contaminant removal and alternative nitrogen removal pathways in denitrifying bioreactors
… and low-cost technology for the effective removal of nitrogen (N) from water by enhancing denitrification (i.e. the bacterial conversion of nitrate [NO3-] to N gas). To date, studies on denitrifying bioreactors have mainly focused on the ability of, and factors influencing, the removal of …
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Contaminant removal from impervious pavements and its relationship with raindrop impact energy, cumulative kinetic energy of rainfall events, and rainwater pH
The relationships between contaminant removal from impervious pavements and raindrop impact energy, cumulative kinetic energy of rainfall events, and rainwater fit were evaluated. A commercial urban area was chosen to perform simulated rainfall experiments. The runoff from these experiments was …
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Evaluation of Contaminant Removal Through Soil Aquifer Treatment by a Lab Scale Soil Column Experiment Including a Trace Contaminant Spike Test
Soil aquifer treatment (SAT), the removal of contaminants during percolation through soil, is a strategy employed in managed aquifer recharge (MAR), one method of indirect potable water reuse. As part of Hampton Roads Sanitation District's (HRSD) MAR project, The Sustainable Water Initiative for …
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Analysis of Aquifer and Operational Conditions for Successful Soil Aquifer Treatment of Treated Wastewater via Synthesis of Published Full-Scale and Laboratory-Scale Studies
… study was to develop a basis for predicting the contaminant removal capabilities of any given aquifer during managed recharge with treated wastewater.</p> <p>Over 40 published SAT studies were reviewed and systematically compared to determine the influence of five major factors on contaminant …
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Multifunctional Graphene-Based Nanomaterials for Removal of Diverse Water Contaminants
… alternative methods of water treatment and contaminant removal. Based on these premises, with the increasing interest in sustainable, less energy-intensive technologies, graphene-based nanomaterials have gained a lot of attention due to their unique properties in a wide range of …
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Treatment of Oil-Sands Produced Water by Electrocoagulation
… is to develop new treatment solutions for the removal of contaminants, particularly silica but also organics and some hardness, using electrocoagulation to enable increased water recycling while decreasing capital and operating costs. The treatment of oil sands produced water by …
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Evaluating the Metal Tolerance Capacity of Oil Sands Tailings Microbes, and their Ability to Degrade Naphthenic Acids While Attached to Biochar
… OSPW microbes would be more effective at contaminant removal than either independent approach. Metal susceptibility experiments with the OSPW community demonstrated elevated tolerances to OSPW metals. Microbial-biochar work showed biochar NA removal was enhanced by microbial degradation, …
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The Role of Streambed Biofilms in The Removal of Biodegradable Contaminants From Shallow Streams
… that streambed biofilms are important in contaminant removal in shallow streams. However, the ability to predict the rate at which this removal occurs did not exist. To develop a model describing streambed biofilm activity, experiments were conducted in an 8-meter long artificial stream to …
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Effectiveness of Wastewater Treatment for Selected Contaminants Using Constructed Wetlands in Mediterranean Climates
… on looking at the effectiveness of selected contaminant removal based on pilot-scale and full-scale case studies conducted in Mediterranean climate regions around the world for potential application to Mediterranean climate regions in California. The case studies consisted of three basic …
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A Review of Alternatives to Injection of Petroleum Wastewater from Oil and Gas Extraction
… wastewater is likely increasing the toxic contaminants in freshwater sources and contributing to freshwater scarcity despite regulatory guidelines, resulting in negative impacts to aquatic life, soil microbial communities, wildlife, and human communities With the predicted increase in …
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Justification of village scale photovoltaic powered electrodialysis desalination systems for rural India
… system capacity, biological and chemical contaminant removal; water aesthetics; recovery ratio; energy source; economics of water provision; maintenance; and the energetic and cost considerations of available technologies. Within the salinity range of groundwater in India, ED requires less …
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Microbial fuel cells coupled with open pond for wastewater treatment: is it viable?
… a natural water body for energy production and contaminant removal. This MS project aims to explore whether it will be viable to apply SMFCs for wastewater treatment. Experimental SMFCs were studied in several configurations and operational modes for organic removal, nitrate reduction, and …
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The Evaluation of Permeable Cementitious Media for Nutrient Removal
… Permeable pavement systems have been studied for contaminant removal, but there are limitations to the current state of knowledge. Laboratory studies were utilized to fundamentally characterize permeable cementitious media for the removal of nitrate-nitrogen and orthophosphate-phosphorus. Batch …
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Analysis and Treatment of Emerging Polar Contaminants
… the detection and treatment of emerging polar contaminants was developed with accompanying instrumentation. A liquid chromatography system, hyphenated to a universal gas phase detector, flame ionization detector (FID), was designed. By using pure subcritical water as a mobile phase, temperature …
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Efficacy of Catalytic Ozonation Advanced Oxidation Processes Compared to Traditional Ozone-Based Advanced Oxidation Processes for Degradation of Recalcitrant Compounds
… of treatment in order to account for emerging contaminants (ECs) such as pharmaceuticals and personal care products. Advanced oxidation processes (AOPs) have been developed to degrade ECs that are not effectively removed by conventional wastewater treatment. The goal of implementing AOPs is to …
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Visible Light Photocatalytic MoO3-Based Nanomaterials Synthesis, the Effect of Polymer Coatings on Their Photocatalytic Activity and Dissolution, and Their Applications in Water Treatment
… though MoO3 photocatalysts demonstrated high contaminant removal, their stability in water is poor. High dissolution was observed in a wide pH range and particle aggregation was elevated in the presence of inorganic and organic compounds, resulting in diminished photocatalytic activity. …
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Aqueous Silica in the Environment: Effects on Iron Hydroxide Surface Chemistry and Implications for Natural and Engineered Systems
… with silica for 1.5 hours, percentage arsenate removals were high. In contrast, arsenate removals decreased markedly as pH and silica concentrations increased if silica was pre-equilibrated with the iron for 50 days. Trends in percentage removal of humic substances were similar. Competition for …
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Nanoscale structural/chemical characterization of manganese oxide surface layers and nanoparticles, and the associated implications for drinking water
… treatment facilities commonly reduce soluble contaminants, such as soluble manganese (Mn2+), in water by oxidation and subsequent filtration. Previous studies have shown that conventional porous filter system removes Mn2+ from drinking water by developing Mn-oxides (MnOx(s)) bearing coating …
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MANGANESE OXIDE AS A NEW CATHODE CATALYST IN MICROBIAL FUEL CELLS (MFCs)
… Power generation and organic substrate removal efficiency of Co-OMS-2 and Cu-OMS-2 were also compared with Pt cathodes in continuous-flow SCMFCs under different hydraulic retention times (HRTs) and chemical oxygen demands (CODs). The 600-hr continuous-flow tests showed that Cu-OMS-2 …
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