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 quality guidelines"”.
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Selenium Contamination: The Environmental Effectiveness of Current Treatment Methods in the Mining Industry Based on Water Quality Guidelines
Selenium (Se) contamination in water bodies and ecosystems presents challenges to the environment, including wild species, and human communities. The Elk Valley region in British Columbia (BC), Canada, exemplifies these challenges. This research examines the effectiveness of Teck's Saturated Rock …
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One Size Doesn't Fit All: Developing Bioavailability-based Models for Zinc Toxicity to Microalgae
… This includes metal contamination in freshwater environments. Australia is a major miner and refiner of zinc ore. These operations could lead to increased risk of zinc contamination to freshwater systems due to spills, discharge and runoff. Australia implements national default water …
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Performance assessment of rural water supply system: A case study of Matatani Village, Musina Local Municipality, South Africa
Assessment of the performance of a water supply system is essential to ensure its effectiveness in supplying water to households. The study assessed the performance of rural water supply system using Matatani Village as a case study. Field observations were conducted to identify existing water …
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An investigation of the treatment efficacy of permeable pavements for water quality performance in South Africa
Stormwater pollution has been recognised as a leading cause of ecological degradation of urban streams. Sustainable Drainage Systems (SuDS) attempt to address stormwater impacts by flow attenuation and pollutant treatment, simultaneously providing amenities such as water for use in irrigation or …
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Development of a rapid Hormosira banksii bioassay using chlorophyll a fluorescence
… to future acceptance of fluorescence data into water quality guidelines. Essentially, this work describes the development of, and also the successful application of, a novel, fluorescence macroalgae bioassay that not only has advantages over currently employed methods, but also offers a powerful …
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Quantifying stormwater pollutants and the efficacy of sustainable drainage systems on the R300 highway, Cape Town
Stormwater provides a direct link between urban infrastructure and the urbanised natural environment. In particular, highway drainage presents a high risk of pollution when compared to other urban land use areas (Ellis et al., 2012); introducing heavy metals, suspended solids and hydrocarbons to …
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Evaluation of potential acid mine drainage: A case study of the Albert Silver Mine, Mpumalanga Province, South Africa
… little attention was being given to acid mine water generation. This study investigated the current status of acid mine drainage on the Moses river and the potential of the silver ore to produce acid mine drainage. This was achieved through investigating both sulfide and carbonate minerals in …
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Effects of seasonal changes on the depletion of microflora in natural wetlands in Northern KwaZulu Natal
… wetlands are known for their ability to improve water quality through purification and sinking of nutrients and carbon in the sediments. The interactions occurring between microorganism and macrophytes at the rhizosphere also aid in water quality improvement in natural wetlands. In some rural …
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Assessing the Effects of Chronic Neonicotinoid Insecticide Exposure on Aquatic Insects using Multiple Experimental Approaches
… Collectively, these data suggest more rigorous water quality guidelines and agricultural management strategies are needed to protect aquatic insects and the higher trophic organisms that rely on this important food source.
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The Influence of Water Quality Characteristics on Vanadium Toxicity to Model Aquatic Organisms
… used to treat oil sands process-affected water (OSPW) to reduce organic toxicants. However, PC contains up to 1,000 mg of V per kg of PC, and during OSPW treatment V leaches from coke reaching levels of up to 7 mg/L in “treated” OSPW, a concentration that is toxic to aquatic organisms. …
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Water Quality and Groundwater Discharge in the Halton Region
… Halton and the Halton Region, we assessed water quality in 21 of Conservation Halton’s watersheds at a high resolution (n>500 samples across n>40 streams) in 2022 to better understand nutrient, major and trace element dynamics and underlying controls in streams in this rapidly urbanizing …
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Assessing the microbial community structure’s diversity associated with nutrients concentration in the natural wetland systems
… and challenging environmental problems in the water that usually result to serious environmental and health challenges. For this study, water and sediment samples were collected over a period of twelve months from Lake Icubhu, which is a fresh water wetland, and Nhlabane mouth Estuary. The …
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Crop response to irrigation with acidic and neutralized, saline mine water
… (AMD) to surrounding environments. In the Witwatersrand Goldfields, AMD arising from abandoned mines is currently being treated by High-Density Sludge (HDS) neutralization and released into surrounding natural water bodies as part of a short-term intervention. Long term management of the water …
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The variance in the water quality of the lower orange river
… for measuring the status of river ecosystems, water quality and water demand, and can provide early warning for management intervention with regard to water quality and quantity. This can be quite a daunting undertaking for rivers that cross national boundaries such as the Orange River. …
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Sewage, salt, and sediments: water-quality assessment of the lower Vaal-Orange River system
ENGLISH ABSTRACT: Water users in the lower Vaal-Orange River system are subjected to chemicals and pathogens from sources over which they have little control. These sources include raw sewage from dysfunctional wastewater-treatment works, saline irrigation return flows and upstream discharges from …
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Potential groundwater contamination from pit latrines in Ga-Maja and Reefentse
… excreta removal in low-income countries. Groundwater is a critical water resource in many peri-urban areas where there is no municipal water supply. Groundwater resources are commonly vulnerable to pollution from on-site sanitation practises, which may degrade their quality. Because groundwater …
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Environmental Impacts of Tin Mine Waste: A Case Study of the Zaaiplaats Tin Mine, Limpopo Province, South Africa
… Heavy metals were investigated in the tailings, water and plants found at the mine. A radiation survey was also conducted to check for the possibility of potential radionuclides induced by the mine. Fieldwork involved collection of tailings within the old river channel, Heap A, B and C. A total …
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Selenium uptake, trophic transfer, and toxicity in boreal lake ecosystems
… in aquatic systems, and fish tissue-based guidelines for the protection of aquatic life are preferred over water quality guidelines. To date, few studies have assessed Se bioaccumulation in cold-water systems, such as Canadian boreal forest lakes. These lakes, which comprise a large …
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Bioaccumulation and Toxicokinetics of Polycyclic Aromatic Compounds and Metals in Giant Floater Mussels (Pyganodon grandis) Exposed to a Simulated Diluted Bitumen Spill
… and potential toxic effects of dilbit in a freshwater Boreal lake to inform evidence-based management strategies for the transport of dilbit. A range of controlled dilbit spills was performed in seven 10 m diameter limnocorrals (~100,000 L of water) resulting in environmentally realistic …
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