Browsing Earth and Environmental Sciences by Supervisor "Ptacek, Carol"
Now showing items 1-15 of 15
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Characterizing and Modelling Tailings Hydrogeochemistry Under a Composite Cover at the Abandoned Kam Kotia Mine, ON
(University of Waterloo, 2023-01-09)A principal environmental concern associated with mining is the weathering of mine waste in the presence of oxygen and water that generates acid mine drainage (AMD) concentrated in toxic elements. Installation of composite ... -
Effectiveness of Organic Carbon Cover Systems on Sulfide-rich Tailings
(University of Waterloo, 2021-09-27)Acid mine drainage (AMD) occurs when sulfide minerals oxidize; generating low pH water and the release of dissolved metals. This phenomena is of primary concern in the mining industry, where the future loading of dissolved ... -
Emerging Contaminants: Artificial Sweetener Sample Preservation and Palladium Nanoparticle Transport in Porous Media
(University of Waterloo, 2017-04-25)Emerging contaminants are an increasing concern for regulatory bodies: artificial sweeteners and nanoparticles (NPs) included. Artificial sweeteners are found in domestic waste waters and can be used as tracers of anthropogenic ... -
Evaluation of the Removal of Perfluoroalkyl Substances from Aqueous Matrices in the Presence of Zerovalent Iron
(University of Waterloo, 2018-01-17)Per- and polyfluoroalkyl substances (PFASs) are a class of persistent organic pollutants present in the environment that pose a threat to human health. PFASs primarily reside within aqueous phases and are present in ... -
Impacts of Dredging and Brush Cutting of Paired Agricultural Drainage Ditches on GHG Emissions and Nutrient Filtration Capacity
(University of Waterloo, 2023-01-04)Agriculture provides many beneficial and essential ecosystem services. Along with these beneficial services, the conversion of natural ecosystems into heavily modified agricultural ecosystems is also a source of ... -
Integration of Active and Passive Sampling Techniques for Characterization of Non-point Source Contamination from Septic Systems in Rural Ontario Hamlets
(University of Waterloo, 2019-04-30)Excessive nutrient loading to surface water bodies can lead to the development of eutrophic conditions, including deterioration of water quality and ecological stability. Sources of nutrient loading include wastewater ... -
Investigation of the Efficacy of in situ Degradation Methods for Perfluorooctanoic Acid (PFOA) and Perfluorooctane Sulfonic Acid (PFOS) in Groundwater
(University of Waterloo, 2018-01-17)Per- and polyfluoroalkyl substances (PFASs) are a group of emerging contaminants that include perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS). PFASs can be released into groundwater through the ... -
Mercury Stabilization in Contaminated Sediment by Co-blending with Solid-Phase Reactive Media
(University of Waterloo, 2016-09-01)Mercury (Hg) is a toxic heavy metal and environmental contaminant that can accumulate in both terrestrial and aquatic environments. Pollutant Hg is derived primarily from anthropogenic sources such as mining, coal burning ... -
Mercury Transformation and Release from Contaminated Soil Following Perturbations in Solution Chemistry and Application of Polysulfide
(University of Waterloo, 2018-04-09)Mercury (Hg) is a contaminant of concern due to the very high toxicity and bioaccumulating nature of organic Hg and the persistent leaching of Hg to water bodies from contaminated soils and sediments. The deleterious ... -
Metal Isotope Fractionation Associated with Cu and Zn Attenuation by Zero-Valent Iron in Anaerobic Flow-Through Cell Experiments
(University of Waterloo, 2018-01-12)Metal stable isotope fractionation is an emerging tool in the environmental sciences for studying biogeochemical pathways for cycling of metals in the environment. Copper and zinc are essential elements for many biological ... -
Mitigating Agricultural Impacts from Field to Stream: Optimizing Biochar Field Amendments and Novel Denitrifying Bioreactors for Mitigating Greenhouse Gas Emissions
(University of Waterloo, 2021-06-01)Greenhouse gas (GHG) emissions resulting from agricultural activities are a major contributor to total emissions in Canada and around the world. The application of synthetic and animal-manure fertilizers is common practice ... -
Passive sampling to understand and predict sources of wastewater and agricultural contamination in rural watersheds
(University of Waterloo, 2023-07-12)Passive sampling techniques have emerged as valuable tools in environmental monitoring, offering distinct advantages over traditional discrete sampling methods. Discrete sampling techniques are only representative of the ... -
Removal of Arsenic and Metals from Mine-impacted Groundwater Using Organic Carbon and Zero-valent Iron in Passive Remediation Systems
(University of Waterloo, 2020-09-21)Arsenic (As) is a wide-spread contaminant, often encountered in drainage associated with Au mining. The oxidation state controls the mobility and toxicity of As in water. Passive remediation is a potential management ... -
Removal of Perchlorate, Pharmaceutical Compounds, Artificial Sweeteners, and Perfluoroalkyl Substances from Water Using Photocatalytic and Passive Treatment Systems
(University of Waterloo, 2017-07-12)The persistence and widespread occurrence of emerging contaminants (ECs) such as perchlorate (ClO4-), pharmaceutical compounds, artificial sweeteners, and perfluoroalkyl substances in the environment has received increasing ... -
Stabilization of Mercury in River Water and Sediment Using Biochars
(University of Waterloo, 2016-11-29)Mercury (Hg) is a common contaminant in air, oceans, lakes, rivers, soils, and sediments as elemental, inorganic and organic forms. Organic Hg (e.g., methylmercury (MeHg)), which is much more toxic than other forms and can ...