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 783 for “"pollutant"”.
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Mechanistic Study of Pollutant Degradation
… been developed to clean sites contaminated with pollutants. More knowledge and better understanding in this field will help to protect our environment. The goal of the research in this thesis is to gain a better understanding of the mechanism of organic pollutant degradation in Fenton reactions …
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One dimensional pollutant transport model
… of a numerical model for one-dimensional pollutant transport in a porous medium. A computer program POLUTE1D has been developed. The numerical model is based on the flow and mass transport equations and the finite element method has been used for its formulation. The problem involves …
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Pollutant swapping in constructed agricultural wetlands
… However, wetlands may potentially facilitate ‘pollutant swapping’: the transfer of one form or pathway of pollution for another, as a result of mitigation efforts. Retained pollutants may be remobilised through solubilisation or as the greenhouse gases (GHGs): methane (CH4), carbon dioxide …
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Aesthetic pollutant loadings in upstream combined sewers.
… Treatment Directive (1991). To prevent aesthetic pollutants being discharged from a CSO, it is first necessary to gain an understanding of the quantity and temporal distribution of solids that enter the structure. This knowledge can then be used to predict the quantity of solids that are presented …
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Precombustion Removal of Hazardous Air Pollutant Precursors
… standards for 190 potentially hazardous air pollutant precursors (HAPPs). Studies have suggested that many of these HAPPs have the potential to be removed prior to combustion. This thesis details the findings of a bench-scale test program that was implemented to evaluate the capabilities of …
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Novel mesoporous silicates as indoor air pollutant scavengers
… organic compounds (VOCs). The indoor air pollutants of interest were formaldehyde, toluene, ethylbenzene, o-xylene, cumene and dichlorobenzene. The indoor air pollutants were actively sampled onto (i) Tenax filled sampling tubes and subsequently analysed by thermal desorption gas …
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Extended stormwater detention basin design for pollutant removal
… detention time is used in conjunction with a pollutant settling efficiency-detention time curve to estimate the settling efficiency. This curve is generated from Storm Water Management Model (SWMM) simulations and shown to be independent of runoff statistics, pond configuration, and arbitrary …
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Numerical modelling of transport of pollutant through soils
Prediction of subsurface migration of contaminant through soils involves analyses of unsaturated and saturated flow of water and advective dispersive transport of contaminant species. A finite element model is developed here for such an analysis. It is based on the transient nonlinear Richard's …
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SUB-SURFACE MIGRATION OF AN OIL POLLUTANT INTO AQUIFERS
… following a sub-surface spillage of immiscible pollutants such as oil, petroleum and other organic chemicals is an increasingly potent threat, through escalating industrial application of such pollutants. This study significantly enhances the understanding of the flow of immiscible pollutants …
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Pollutant monitoring with fibre optics in the deep ultraviolet
This thesis reports on work carried out in the development of ultraviolet fibre-optic based absorption sensor systems, including those with the newly available ultraviolet improved silica fibres having low attenuation in the 200 nm to 250 nm wavelength region. Several approaches to optimize the …
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Economically Optimal Design of Particulate Air Pollutant Control Equipment
Made available in DSpace on 2014-12-10T22:48:23Z (GMT). No. of bitstreams: 1 7412199.pdf: 4266540 bytes, checksum: a5a2498042c23f1216258867e9cc74e6 (MD5) Previous issue date: 1973
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The influence of buoyancy upon near wake pollutant dispersal
… particular interest since it is a region where pollutant is likely to accumulate and become trapped. Understanding the mechanisms of pollutant trapping within wakes, and how pollutant buoyancy might change this, is crucial to understand human exposure to the many sources of pollutant present …
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Towards an improved procedure for estimating industrial-pollutant emissions
Thesis (M.C.P.)--Massachusetts Institute of Technology, Dept. of Urban Studies and Planning, 1992.
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Simulation of Runoff and Pollutant Loss in Urbanizing Watersheds
… planners. Urbanization increases runoff and pollutant loadings to the watershed outlet. Watershed planners in areas that previously had little impervious cover must now consider the effects of new roads and buildings on hydrologic processes. The ANSWERS-2000 watershed model was modified to …
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Responses of an Environmental Gram-negative Bacterium to Pollutant Stress
… kDa proteins for strain VUN10,077. Selected pollutants impacted on the cell viability and sub-lethal levels of these were determined as follows; 2.0 gL-1 for CdCl2, 2.0 gL-1 for CuCl2.2H2O, 2.0 gL-1 for NiCl2.6H2O, 1.0 gL-1 for CoCl2.6H2O, 0.025 gL-1 for HgCl2, 0.25 gL-1 for SDS, 0.2 gL-1 for …
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Zeolite Incorporated Materials for Targeted Biomass Retention and Pollutant Removal
… describes the assessment and treatment of pollutants, namely nutrients, in waste streams. Nutrients such as nitrogen, are of major and growing concern because nitrogen removal from waste streams is energy and cost intensive; yet, without treatment cause eutrophication in aquatic systems. …
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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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