Browsing Earth and Environmental Sciences by Title
Now showing items 241-260 of 434
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A mechanistic approach to assessment of the geochemical evolution of low sulfide mine-waste rock
(University of Waterloo, 2019-01-04)The potential for mine wastes to generate elevated concentrations of solutes including metals, sulfate, and reduced pH exists wherever mine-waste rock is stockpiled at the Earth’s surface representing one of the world’s ... -
A Mechanistic Derivation of The Monod Equation For Biofilm in Porous Media
(University of Waterloo, 2021-12-20)A mechanistic derivation of the Monod bioreaction equation is presented. The numerical model developed for this derivation involves four processes. 1)On the pore scale, substrate diffuses from the bulk aqueous phase crossing ... -
Mercury distribution and speciation in biochar particles reacted with contaminated sediment up to 1030days: A synchrotron- based study
(Elsevier, 2019-04-20)A previous long-term microcosm experiment showed mercury (Hg) in the aqueous phase of contaminated sediment was effectively stabilized through the addition of biochar. The present study focuses on the application of ... -
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 ... -
Meso – and Neoarchean tectonic evolution of the northwestern Superior Province: Insights from a U-Pb geochronology, Nd isotope, and geochemistry study of the Island Lake greenstone belt, Northeastern Manitoba
(University of Waterloo, 2011-01-21)What tectonic processes were operating in the Archean, and whether they were similar to the “modern-style” plate tectonics seen operating today, is a fundamental question about Archean geology. The Superior Province is the ... -
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 ... -
Metal loads in an urban catchment (Don River, Ontario)
(University of Waterloo, 2015-01-19)The Don River watershed has been called the most urbanized watershed in Canada. Trace metals are common contaminants in urban areas that may threaten ecosystems at high concentrations. Major urban sources of trace metal ... -
Metamorphic History of the Mougooderra Formation, Yilgarn Craton, Western Australia
(University of Waterloo, 2018-12-05)Sedimentary sequences are common in granite-greenstone belts of Archean terranes. In the Yilgarn Craton of Western Australia, the Mougooderra Formation is an extensive sedimentary sequence that preserves low-variance ... -
Methane gas transport in unconfined aquifers: A numerical sensitivity study of a controlled release experiment at CFB Borden
(Elsevier, 2019-08)Subsurface leakage of natural gas from petroleum wells can impact freshwater aquifers. Accurate prediction of gas migration in the subsurface will depend on knowledge of permeability, porosity, and flow system conditions. ... -
Methodologies for capture zone delineation for the Waterloo Moraine well fields
(University of Waterloo, 2000)The Region of Waterloo relies mainly (75 %) on local groundwater resources for its drinking water supply. The water demand is increasing with the growth of the population and there is a need to enhance the present water ... -
Methylmercury Production in Riverbank Sediments of the South River, Virginia (USA) and Assessment of Biochar as a Mercury Treatment Option
(University of Waterloo, 2014-01-24)Mercury (Hg) is a toxic element which bioaccumulates in the food chain when methylated and poses a health risk to the human population mainly through fish consumption. It is released into the environment through both ... -
Metolachlor and TCE Plume Characteristics in a Dolostone Aquifer Using a Transect
(University of Waterloo, 2006)Much is known about natural attenuation of contaminants in granular aquifers because many contaminant plumes in these aquifers have been intensively monitored with detailed sampling along cross sections positioned across ... -
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 ... -
Mo isotope variations in molybdenites at single-crystal, ore deposit, and global scales: Implications for Mo source fluid, transport, fractionation mechanisms, and molybdenite mineralization
(University of Waterloo, 2018-05-22)In this study, the Mo isotopic composition (δ98Mo) of molybdenite from 29 hand samples from various ore deposit types was analyzed. This data was compiled with data from the literature and all data (n = 420) was reported ... -
A Model for the Oceanic Mass Balance of Rhenium and Implications for the Extent of Proterozoic Ocean Anoxia
(Elsevier, 2018-04-15)Emerging geochemical evidence suggests that the atmosphere-ocean system underwent a significant decrease in O2 content following the Great Oxidation Event (GOE), leading to a mid-Proterozoic ocean (ca. 2.0–0.8 Ga) with ... -
Modeling a controlled-sourced, multichemical plume undergoing natural attenuation
(University of Waterloo, 2004)Sampling of an emplaced creosote source installed below the water table at CFB Borden was conducted over a period of ten years, with over nine thousand samples taken from approximately 250 multilevel samplers. This ... -
Modeling of carbon dioxide dissolution in an injection well for geologic sequestration in aquifers
(Elsevier, 2021-04-15)Carbon dioxide (CO2) sequestration is considered to be one of the most effective technologies of mitigating greenhouse gas emissions. In this technology, single phase supercritical CO2 is injected into an underground ... -
Modeling Phosphorus Cycling in a Seasonally Stratified Reservoir (Fanshawe Reservoir, Ontario, Canada)
(University of Waterloo, 2020-09-22)Human activities, such as mining, sewage discharge, fertilizer usage and dam construction for electricity and flood controll, have significantly disturbed the biogeochemical cycling of nutrients, such as carbon, phosphorus, ... -
Modelling Biogeochemical Cycles Across Scales: From Whole-Lake Phosphorus Dynamics to Microbial Reaction Systems
(University of Waterloo, 2020-01-21)Lakes are ecologically, economically, and culturally significant resources that are, at the same time, very fragile and sensitive to human disturbances. During the last decades, intensified urbanization and discharge of ...