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 62 for “"Receiving Waters"”.
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Characterization of pond effluents and biological and physicochemical assessment of receiving waters in Ghana
… actual impacts of pond aquaculture effluents on receiving stream quality in the Ashanti and Brong Ahafo regions of Ghana. Water, fish and macroinvertebrate samples were collected from upstream, downstream and nearby reference streams of, and questionnaires administered to, 32 farms. Total …
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Determination of Urban Land Use Variables That Accurately Predict Fecal Coliform Levels In Shellfish Harvesting Waters Within Estuarine Salt Marsh Ecosystems of the Southeastern United States of America.
… concern of the impacts of development on receiving waters. The increased use of Geographic Information Systems (GIS) at the county level has led to greater availability of land use data at larger scales. This newly, widely available large-scale data may prove to be useful in the study of …
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Understanding the role of scale in assessing sediment and nutrient loads from Coastal Plain watersheds delivered to the Chesapeake Bay
… nitrogen (N) and phosphorus (P) loading to receiving waters. Coastal waters in the southeastern U.S. are vulnerable to human impacts due to the proximity to urban an agricultural land uses, and hydrologic connection of the Coastal Plain to receiving waters. To mitigate the impacts of urban …
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Natural and synthetic estrogens in wastewater treatment plant effluent and the coastal ocean
… (e.g., humans and fish) and can enter natural waters through the discharge of treated and raw sewage. Because estrogens are detrimental to aquatic organisms at picomolar concentrations, many studies have measured so-called “free” estrogen concentrations in wastewater effluents, rivers, and …
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Predictive control of urban wastewater systems
… Tackling this concern, the incorporation of receiving water quality objectives within the control strategy is proposed. To this end, the application of linear MPC to the control of dissolved oxygen concentrations in the receiving waters under storm conditions is demonstrated. The drawbacks …
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Natural and synthetic estrogens in wastewater treatment plant effuent and the coastal ocean
… (e.g., humans and fish) and can enter natural waters through the discharge of treated and raw sewage. Because estrogens are detrimental to aquatic organisms at picomolar concentrations, many studies have measured so-called "free" estrogen concentrations in wastewater effluents, rivers, and …
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OPEs, What Do We Do? Modeling Emissions, Fate, and Mitigation of Organophosphate Esters in Urban Systems
… driven by efficient scavenging from air to receiving waters by precipitation while non-chlorinated-OPEs acted as Persistent, Bioaccumulative and Toxic (PBTs) compounds. Stormwater and treated wastewater discharges were important pathways of OPEs from Toronto air emissions to receiving …
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Examination of synergism in nitrate and orthophosphate removal in bioreactors
… fertilizers has had a detrimental effect on the receiving waters of agricultural watersheds. Due to their important role in plant nutrition, the two main nutrients generally associated with these impacts are nitrogen and phosphorus resulting from high application rates as well as high potential …
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Characterizing water quality, nutrients, and dissolved oxygen dynamics in four Lake Ontario coastal wetlands
… their role in regulating nutrient loadings to receiving waters remains unclear. Over a decade of monitoring by the Toronto and Region Conservation Authority revealed that four wetlands (Rouge Marsh, Duffin’s Marsh, Carruthers Marsh, and Frenchman’s Bay) vary as net sinks or sources of …
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First Flush Characterization of Storm Water Runoff
… heavy metals and particulate matter, to receiving waters. Heavy metals, either in dissolved or particulate bound phases, are unique in the fact that unlike organic compounds, they are not degraded in the environment. The objective was to develop a mass loading based diagram of the "first …
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Degradation of orthochlorophenol by an aquatic actinomycete
… phenolic wastes which are objectionable to receiving waters by conventional biological treatment, It has been established that some actinomycetes, especially Streptomyces species, are capable of decomposing a wide variety of aromatic compounds, including phenols, The.purpose of this …
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Storm Water System Monitoring for the Small Municipality Under Phase II of the National Pollutant Discharge Elimination System
… water quality can have a significant impact on receiving water bodies. The chief recipients of these impacts are aquatic life in the receiving water body and downstream water users. Over the last few decades, legislation, regulations, institutions and facilities have evolved to recognize the …
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Understanding the role of aquatic plants in stormwater management pond performance in Oshawa, Ontario, Canada
… and treat stormwater runoff before it enters receiving waters in urbanizing landscapes. While these systems are not considered natural, they are typically colonized by aquatic plants. Although submergent and emergent vegetation is common in SMPs, not much is known about their potential impacts …
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The effect of varying food-to-microorganism ratios on phosphate uptake in an activated sludge environment
… process for the removal of nutrients to receiving waters has become a difficult problem of major proportions. It was the purpose of this study to clarify the importance of the food-to-microorganism ratio (F/M) and to evaluate the nature of phosphate uptake in the activated sludge …
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The Environmental Fate and transport of Trenbolone Acetate Metabolites in Agro-Ecosystems
… occur if trace concentrations (>10 ng/L) reach receiving waters. While the ecotoxicity of TBA metabolites, including 17alpha-trenbolone (17a-TBOH), 17a-trenbolone, and trendione, have been reasonably well characterized, their fate and transport in the environment is poorly characterized. …
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Characterization of Rain and Stormwater Nitrogen Inputs to the Mississippi Sound: A Landscape Approach
<p>Urbanization in coastal watersheds is becoming an increasingly important issue in the world. Increased impervious surface cover, a factor of urbanization, has drawn more attention to stormwater runoff as a source of contamination to receiving waters. In this study, nitrogen species from rain and …
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Impact of Substrate on Nutrient Removal in In-Ditch Bioreactors
… negative effects, such as eutrophication in the receiving waters. In-ditch bioreactors are a simple, inexpensive treatment technology that could potentially remove nitrogen and phosphorus from agricultural runoff. In-ditch bioreactors are intended to reduce flow rate and stimulate denitrification …
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The development and assessment of an automated biological monitoring system using crayfish locomotor activity to detect toxic stress
… rapidly enough to prevent serious damage to receiving waters. A computer automated system was developed to continuously monitor spontaneous locomotor activity of eight crayfish. Electric potentials generated by muscular movements of untethered crayfish were detected by external electrodes, …
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Fate and behaviour of drugs in the environment
… containing myriads of chemicals are passed into receiving waters due to incomplete removal processes as have been identified in several studies. The current work aimed to determine the levels of these chemicals in the effluents from Stoke Bardolph STW, Nottingham and to determine the fate and …
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The effect of alternative detergent builders on the nutrient removal activated sludge sewage treatment process
… countries of reducing the phosphorous load to receiving waters. In South Africa, detergent manufacturers are anticipating consumer pressure to reformulate their detergent products to eliminate phosphate. The two possible replacements for phosphates are zeolite 4A and high surface area {HSA) …
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