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 23 for “"water contaminants"”.
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Multifunctional Graphene-Based Nanomaterials for Removal of Diverse Water Contaminants
Importance of the quality of potable water is becoming more critical to the health and safety of the world’s population as widespread water crisis and risks of natural and man-made contamination are rising all around the world. Limitations of the conventional water treatment techniques has drawn …
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Occurrence, monitoring and removal of drinking water contaminants by advanced technologies
<p>"In order to maintain drinking water primary standards compliance under the USEPA Stage 2 Disinfectant Disinfection Byproducts Rule, drinking water treatment plants (DWTPs) are switching from free chlorine (FC) to chloramines (MCA). Concerns are raised as MCA disinfection has been linked …
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Calibration, feature extraction and classification of water contaminants using a differential mobility spectrometer
… and concentration classification of water contaminants for FAIMS signals. The three steps in this approach are calibration, feature extraction, and classification. Calibration was carried out to remove baseline fluctation and other variations in FAIMS data sets. Four feature …
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Toxicity mechanism of anthropogenic water contaminants: drinking water disinfection by-products (haloacetic acids) and particle associated contaminants from sealcoats (polyaromatic hydrocarbons) in lake sediments
Drinking water disinfection was one of the major public health accomplishments of 20th century. Water disinfection helps in reducing waterborne diseases like typhoid fever, cholera, and hepatitis A. However, chemical water disinfection also produces unwanted toxic chemicals, known as water …
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Examining the Relationship Between Safe Drinking Water Violations and Adverse Birth Outcomes in Virginia
The Safe Drinking Water Act (SDWA) was established to protect consumers from potential exposure to over 90 water contaminants. Each contaminant is assigned a health-based standard meant to reflect the maximum level at which an adverse human health outcome is unlikely; measurements beyond that level …
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The biodegradation potential of methanol, benzene, and m-xylene in a saturated subsurface environment
… can successfully be applied to remove ground water contaminants particularly in situations where the adsorptive capacity of the soil plays a major role. Frequently, enhanced in situ bioremediation techniques rely on indigenous microorganisms to degrade ground water contaminants; this technique …
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Chemical exposures in drinking water: contaminant analysis and physicochemical behavior
… and leveraged to characterize human exposures to contaminants in drinking water and improve methods for assessing such risks. The occurrence of organic industrial pollutants in domestic well waters was investigated, with a particular focus on the impacts of region-specific industrial activity …
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Nanofiltration membranes modified with aromatic polyamide dendrimers active layers
… the basis of rejection abilities of a variety of water contaminants having a range of sizes and chemistry. As the water flux is inversely proportional to the thickness of the active layer, we optimize the amount of dendrimers deposited for specific contaminants to improve the solute rejection …
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Aerosolization of Drinking Water Metals to Indoor Air and Assessment of Human Taste and Visual Thresholds for Manganese
Exposure to excess manganese via drinking water raises concerns due to potential for adverse neurological impacts, particularly in children. Manganese is ubiquitous in US groundwaters above the SMCL = 0.05 mg/L. Manganese is an essential nutrient, but exposures to elevated manganese have neurotoxic …
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Dietary Intake and Bio-activation of Nitrite and Nitrate in Newborn Infants
… possibly carcinogenic food additives, or well-water contaminants. However, recent studies have shown that nitrate and nitrite play an important role in cardiovascular and gastrointestinal homeostasis through conversion back into NO via a physiological system involving enterosalivary …
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Social Data Mining for Crime Intelligence: Contributions to Social Data Quality Assessment and Prediction Methods
… innovatively adapting the methods of monitoring water contaminants. Several experiments were conducted and the results obtained revealed the significance of this study in mining social data for crime intelligence and in developing social data quality filters and decision support systems.
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Optimization of biosorption process using cucumis melo rind for the removal of Fe, Mn and Pb ions from groundwater
… for the treatment of metal-bearing groundwater. Several fruits and agricultural by-products demonstrated the ability to remove the heavy metals and thereby reduce the water contaminants. In the present study, the potential use of biosorbent material obtained from Cucumis melo rind for the …
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Advancing Rural Public Health: From Drinking Water Quality and Health Outcome Meta-analyses to Wastewater-based Pathogen Monitoring
… non-federally regulated, primary drinking water sources. Chronic conditions prevalent in rural communities such as diabetes and hypertension are frequently linked with longer duration and higher severity of symptoms than in urban areas; this association suggests that the risk of exposure to …
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Fate and effect of amoxicillin in space and terrestrial water reclamation systems
… towards long-term manned space travel, wastewater recycling will be necessary to provide adequate water. Contaminants, including pharmaceuticals, may be present if astronauts take medications. The overall effects of pharmaceuticals, specifically antibiotics, in recycled wastewater are …
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Novel Approaches to Exposure Assessment and Dose Response to Contaminants in Drinking Water and Food
In the fields of water safety, food safety, and public communications, the overarching goal is to improve public health. Thus, this dissertation focuses on risk assessment and applying novel methods for exposure assessments and dose responses to contaminants in drinking water and foods. Factors …
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Leveraging the Photochemistry of N-Nitrosamines for Their Aqueous Detection, and Development of a Novel Hemi-Iptycene for Porous Polymers
… N-nitrosamines. The role of N-nitrosamines as water contaminants and the methods for their detection are also discussed. In Chapter 2, two synthetic routes are used to synthesize several 9,9-disubstituted-9,10-dihydroacridines (DHAs). In one route, the final synthetic step consists of …
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Nanotechnology and Biotechnology for Water Treatment: A Comparative Study
… world’s population does not have access to clean water and about 1.6 million deaths are caused by contaminated water annually. Even though there are several drinking water treatment technologies available today, they are not widely distributed or suitable for all types of water contamination …
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Development of a sustainable water treatment technology for oxyanions using palladium-based catalysts: catalyst design, reaction mechanisms, and life cycle assessment
Perchlorate and nitrate are oxyanion contaminants found in many drinking water sources, causing human health risks when consumed even at low concentrations. These oxyanions are not removed via conventional drinking water treatment processes, and require specialized treatment. One emerging …
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Electrochemical and thermochemical destruction of chlorinated solvents
… belongs to the most potential technique for wastewater treatment--only electrochemical method is possible to simultaneously destroy all water contaminants; the invented thermochemical method is the fastest way to destroy chlorinated solvents. In the first part of this work, the anodic oxidation of …
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EVALUATION OF TERAHERTZ TECHNOLOGY TO DETERMINE CHARACTERISTICS AND CONTAMINANTS IN ENGINE OIL
… oil grades, engine oil types, and engine oil contaminants by using terahertz time-domain spectroscopy (THz-TDS). The first experiment was classifying gasoline engine oils of various viscosities by using THz-TDS. The range of 0.5–2.0 THz was evaluated for distinguishing among gasoline engine …
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