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 21 for “"pollutant load"”.
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Effluent characterization of flow-through aquaculture operations in West Virginia
In order to reduce pollutant loading nationwide, the U.S. Environmental Protection Agency (EPA), working in conjunction with the U.S. Department of Agriculture (USDA), is in the process of developing effluent management guidelines and standards for private and public aquaculture operations. The …
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Urban drainage modeling and evolutionary multiobjective optimization for combined sewer overflows prediction and control
… support for the minimization of both the pollutant load of CSOs and the risk of basement and street flooding. We first implemented a computationally efficient model that predicts the volume, frequency, and duration of CSOs. The model uses an existing probabilistic approach to simulate the …
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Evolution and Application of Urban Watershed Management Planning
… use and selection of hydrologic, hydraulic, and pollutant load models were identified, specifically in the past decade. Project prioritization was found to increasingly focus on feasibility in implementation. Additional qualitative trends identified include an increased focus on water quality and …
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Comparing Two Methods for Developing Local Sediment TMDLs to Address Benthic Impairments
… by the Clean Water Act, a total maximum daily load (TMDL) must be developed for impaired waters. When developing a TMDL for aquatic life use impairment where sediment has been identified as the primary pollutant, the target sediment load is often determined using a non-impaired reference …
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Locally derived nonpoint loading estimates for the Boeuf River/Bayou Lafourche watershed
… that can be used to quantify nonpoint source pollutant loads from different land-use types. The Louisiana Department of Environmental Quality (LDEQ) is in the process of implementing management programs for impacted water bodies based on the Total Maximum Daily Load (TMDL) of a pollutant. …
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Performance Evaluation of a Low Impact Development Retrofit for Urban Stormwater Treatment
… located in Northern Virginia was examined for pollutant removal and hydrologic performance. The treatment train included four in-line grass swales followed by a bioretention cell with a gravel base. The facility retained 85% of the rainfall. Influent and effluent pollutant loads were calculated …
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Analysis of an Urban Stormwater Bioretention Management Practice in Prince William County, Virginia
… management practice (BMP) intended to mimic the pollutant-removal characteristics of an upland forest habitat. Typical bioretention areas utilize shallow ponding and highly-infiltrative sandy soils to treat the stormwater runoff from small commercial or residential drainage sites. The Kingsbrooke …
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Zinc distribution in a small stream receiving treated textile wastewater
… of the stream functioning to dilute stream pollutant load. Sulfide precipitation appeared to be an important mechanism by which zinc was concentrated in the sediments 40 m below the domestic sewage discharge. Zinc concentrations declined further downstream likely as a result of such factors …
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The threat to South African water security posed by wastewater-driven eutrophication: a proposal for a new regulatory approach
… of all sources of phosphorus (or other pollutants) at a catchment level, rendering problematic, if not impossible, the fair and equitable allocation of levies on wastewater discharges. This dissertation examines how wastewater-originating eutrophication is regulated in the USA and …
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Harvesting of microalgae botryococcus sp. Through phycoremediation of bathroom greywater
… efficiency of Botryococcus sp. in assimilating pollutant load, to optimize the flocculation process and investigate the interactive effects of experimental factors through Response Surface Methodology (RSM) design expert software. Botryococcus sp. was inoculated in bathroom greywater with 4.5 x …
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Tratamiento de aguas residuales de matadero con elevado contenido en sangre mediante combinación de sistemas, anaerobio de película fija (BAPF) y aerobio de membrana (MBR)
… of the slaughterhouse wastewater, increasing its pollutant load, which makes difficult and increases cost of its treatment by means of the conventional processes habitually implanted in this industry. In addition, the increasing requirements in the quality of effluent, specially regarding the …
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A statistical approach to urban stormwater detention planning
… which provide a fixed level of runoff control. A pollutant load model was also formulated, based on a first-order washoff model. This model was used to define pollutant control isoquants. Optimal values of the required storage capacity and treatment rate were obtained by treating the isoquants as …
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Assessing environmental equivalents for water quality trading
… source (PS) dischargers who need to reduce their pollutant loads with land managers who could offset those loads with nonpoint source (NPS) reductions to economically achieve water quality improvements in a watershed. The potential issues impeding WQT are its inability to address trading risks and …
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Simulation of conservation practice effects on water quality under current and future climate scenarios
… practices were effective in reducing a targeted pollutant load, but combined practices were more effective in reducing multiple pollutant loadings simultaneously. No-till was the most effective individual conservation practice, while a combination of five conservation practices was most effective …
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Near bed solids transport in combined sewers
… The mass of solids transport, and associated pollutant load, is compared with other modes of transport.<br/><br/>Using the data collected, contemporary sediment transport models are employed. A modified relationship is proposed for near bed sediment transport over a deposited bed. The …
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Improvement of simulating BMPs and LID practices in L-THIA-LID model
… the greatest reduction in runoff volume and pollutant loads among all scenarios. However, this scenario was not as cost-efficient as most other scenarios. The L-THIA-LID 2.1 model is a valid tool that can be applied to various locations to help identify cost effective BMP/LID practice plans …
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QuickLET : a web-based tool for estimating pollutant loads in a watershed
Web-based modeling tools for estimating pollutant loads in watersheds are few in literature. Those that are available for public access often require domain expertise, making them relevant mostly among environmental researchers. Aside from intensive efforts required to gather enormous amount of …
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Predictability and trends of annual pollutant loads in Midwestern watersheds
… and refining the science of predicting pollutant (nutrient and sediment) export from large scale watersheds. To enable these goals, this research is centered on large watersheds in Midwestern United States, which have been some of the primary sources of nutrient and sediment export to …
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Investigating the properties of persistent organic carbon in municipal wastewater treatment biosolids
… such as pharmaceuticals and persistent organic pollutants (POPs) found in domestic, industrial and hospital effluents to reach the environment. These substances can accumulate in WWPT sludges or treated biosolids, which are currently subject to limited environmental monitoring or regulation for …
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Development and Evaluation of Infilling Methods for Missing Hydrologic and Chemical Watershed Monitoring Data
Watershed monitoring programs generally do not have perfect data collection success rates due to a variety of field and laboratory factors. A major source of error in many stream-gaging records is lost or missing data caused by malfunctioning stream-side equipment. Studies estimate that between 5 …
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