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 37 for “"BTEX"”.
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Application of a Novel Heterogeneous Fenton Catalyst in the Treatment of BTEX-Contaminated Waters
… was applied towards the oxidation of aqueous BTEX solutions in batch reactions, there was an 80% decrease in BTEX concentrations after 3 hours (reaction conditions: [BTEX]o: 100 mg/L, [H2O2]o: 50 mg/L, PAN-(Fe3+): 9 g, pH: 3, reaction volume: 160 mL). Similar results were observed when the …
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Groundwater redox conditions at a petroleum contaminated site, Kuils River, South Africa : pathways for BTEX biodegradation
A shallow sandy aquifer, contaminated by petrol from an underground storage tank, was studied to determine if intrinsic bioremediation of the hydrocarbons is taking place. Groundwater samples taken from 32 monitoring wells were analysed for NO₃-,NH₄+, Mn²+, Fe²+, SO₄²-, and ΣH₂S. Portable …
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Avaliação preliminar da contaminação por BTEX, em água subterrânea de poços tubulares, no município de Natal-RN
… for contamination by volatile hydrocarbons (BTEX - benzene, toluene, ethylbenzene and xylenes), so this work aimed to assess the quality of groundwater wells that supply funding for public supply and trade in the urban area of the city of Natal, in Rio Grande do Norte, contributing to the …
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A Numerical Model (SEAM3D) to Assess the Biotransformation of Chlorinated Ethenes at a TCE/BTEX Contaminated Site
Numerical models (GMS MODFLOW, SEAM3D, and SEAM3D Interface) were applied to simulate groundwater flow, petroleum hydrocarbon compound (PHC) transport and biodegradation, and the transport and biotransformation of chlorinated ethenes at Site FT-002 Plattsburgh Air Force Base (PAFB), NY. Site FT-002 …
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Sequential Electron Acceptor Model of Intrinsic Bioremediation at a BTEX Contaminated LUST Site in Laurel Bay, South Carolina
… benzene, toluene, ethylbenzene, and xylene (BTEX) as well as methyl tertiary butyl ether (MTBE) leaked into the subsurface at the site late in 1990, and monitoring of the water table elevations and contaminant concentrations began in 1993. Using the field data, the groundwater flow model …
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Assessing the Spatial and Temporal Distribution of MTBE and BTEX Compounds in Lake Lewisville, Texas February 1999 - February 2000
… of Methyl Tertiary-Butyl Ether (MTBE) and BTEX (Benzene, Toluene, Ethylbenzene, Xylenes) compounds were assessed in a multipurpose reservoir, Lake Lewisville, Texas between February 1999 and February 2000. Concentrations of MTBE ranged from 0.0 - 16.7 mg/L. Levels of MTBE in the lake were …
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Potential for City Parks to Reduce Exposure to Hazardous Air Pollutants
Benzene, toluene, ethylbenzene, and xylenes (BTEX) are hazardous air pollutants commonly found in outdoor air. Several studies have explored the potential of vegetation to mitigate BTEX in outdoor air, but they are limited to a northern temperate climate and present conflicting results. To …
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An analysis of field data for evidence of anaerobic degradation of PAH and BTEX plumes at manufactured gas plant sites
Field data (including geology, hydrogeology, soil chemistry, groundwater chemistry, and aquifer characteristics) were analyzed at eight MGP sites located in the New Jersey Coastal Plain. These data were used to calculate biodegradation rate constants, which were then compared with laboratory …
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Methodologies for the analysis of petroleum hydrocarbons extracted from contaminated soils
Australian research into TPH and BTEX test methods has, to date, not been coordinated and no standard methods have been agreed to. Overseas research also lacks acceptable solutions for the standardisation of TPH and BTEX methodologies. Since Australia carries out many thousands of analyses of TPH …
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The effects of pH on the biodegradation of benzene, toluene, ethylbenzene, m-Xylene in soils
… a higher cumulative degradation rate of the BTEX compounds than did microcosms under denitrifying conditions. The results from this study suggest that the natural soil pH did not provide an optimum environment for those aerobic respiring microorganisms which degrade BTEX. But rather, each …
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Evaluation of gasoline-denatured ethanol as a carbon source for wastewater denitrification
… as benzene, toluene, ethylbenzene and xylenes (BTEX). Herein are presented the results of using dEtOH, EtOH (95.5% ethanol-4.5% water) and MeOH for denitrification in lab-scale, sequencing batch reactors (SBRs). We also focused on the quantification of BTEX present in dEtOH solution and the …
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Quantitative analysis of volatile organic compounds (VOCs) in soil via passive sampling : polyethylene sampler design and optimization
… and deployment time on the detection limit of BTEX compounds. Preliminary testing of the deployment probe indicates that a design to secure the PE around the outside of a driven rod must include a protective cover over the PE during insertion. A perforated pipe design is suggested. After …
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Containment of Organic Contaminants Using Geosynthetics
… for benzene, toluene, ethylbenzene, and xylenes (BTEX) and PCBs through geomembranes are evaluated. Diffusion of BTEX is also evaluated through vapour barriers, as well as diffusion of PCBs through a compacted clay liner (CCL) and a GCL. The permeation coefficient (Pg) for BTEX diffusion was …
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Metal organic frameworks as sorbents for volatile organic compounds
… toluene, ethyl benzene, and the xylene isomers (BTEX). The Henry’s constant, which describes the adsorption capacity for each MOF, was calculated from the mass change during the adsorption isotherm at 30°C, 25°C, and 20°C. The enthalpy of adsorption and entropy change was determined by plotting …
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DEVELOPMENT OF STANDARD OPERATING PROCEDURE WITH MODIFIED METHOD TO QUANTIFY BENZENE AND OTHER VOLATILE ORGANIC COMPOUNDS IN AIR SAMPLES USING GAS CHROMATOGRAPHY
… as benzene, toluene, ethylbenzene, and xylenes (BTEX). The goal of this project was to develop a standard operating procedure (SOP) and modify the current method for the detection of VOCs associated with oil and gas drilling activity to accommodate the equipment and capabilities of SFASU …
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A Gas Sensor for the Selective Detection of Volatile Organic Compounds
… benzene, toluene, ethyl benzene, para-xylene (BTEX), due to their proven toxicity and prevalence in human environments. With the aim of producing a potentially deployable device, a novel sensing platform was designed and constructed. The main features of this Adsorption Device were an aluminium …
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Characterization of redox conditions in a petroleum contaminated aquifer: Implications for bioremediation potential
… benzene, toluene, ethylbenzene, and the xylenes (BTEX); 2) examine the biodegradation potential in different portions of the plume; and 3) compare methods of TEAP characterization. In general, the presence of Fe-oxides in microcosms inhibited methanogenesis. Although Fe-reducers did not actively …
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Examination of produced water from the Al-Hamada oilfield, Libya.
… TOG, TPH, Base/Neutrals acids, Total phenols, BTEX, PAH carbon distribution of the oil extracted from the samples, inorganic compounds (heavy metals), added chemicals (corrosion inhibitor and biocides). Determinations were carried out using techniques, such as, GC-FID (HS-SPME), GC-MS, …
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Appraisal and validation of rapid, integrated chemical and biological assays of environmental quality
… techniques are presented. Initially, the BTEX RaPDD Assay® ELISA is evaluated to detect semi-volatile hydrocarbons in contaminated groundwater. Although overestimating concentrations when compared to GC-FID/PID, results are well correlated. Secondly, the effectiveness o f the BTEX and …
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Eignung von Mikrokosmen zur Bewertung von Selbstreinigungsprozessen (Natural Attenuation) im Grundwasser eines ehemaligen Kokereigeländes
… für die meisten der untersuchten Schadstoffe (BTEX, PAK) ein anaerober Abbau nachgewiesen werden. Dieser Abbau erfolgte sequenziell und war teils von erhöhten Gesamtzellzahlen begleitet. Durch Versuche mit radioaktiven Schadstoffen wurde die Bildung nicht-extrahierbarer Rückstände im …
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