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 396 for “"Biodegradation"”.
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Biodegradation of Benzene
… of soil inoculation to expedite the biodegradation of benzene. A complete-mix, bench-scale, continuous-flow, activated-sludge reactor was used to develop organisms capable of utilizing benzene as a sole carbon and energy source. Settled pond water was used as seeding inocula and about …
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Enhanced Biodegradation in Landfills
… and bioreactor landfills at enhancing biodegradation, and to optimize the operation of a bioreactor. Waste Management has been examining leachate recirculation landfills for several years. Samples of Municipal Solid Waste (MSW) from existing leachate recirculation (LR) landfills were …
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Biodegradation of leather solid waste
… effectively deal with leather industry wastes. Biodegradation (anaerobic), as a management option, of solid wastes from the leather industry is an area that is attracting increased interest in recent years as being a technique that has wide public acceptability as well as process efficiency. …
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Lignin biodegradation: reduced oxygen species
… of the lignin macromolecule, during its biodegradation, was investigated. Using Coriolus versicolor as a representative of white-rot fungi, I demonstrated that C. versicolor exports superoxide radical and hydrogen peroxide during lignin degradation, into the lignolytic medium. Results …
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Biodegradation of RDX in Rhodococcus spp.
The manufacture, use and storage of explosives over decades have seriously contaminated the environment. Hexa-hydro-1,3,5-trinitro-1,3,5-triazine (Royal Demolition Explosive - RDX) is one of the most widely used explosives. RDX is a man-made compound, recalcitrant to degradation and proven to be …
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Biodegradation and Properties of Phosphated Polyurethanes
… further investigation into effective methods of biodegradation, as well as into the synthesis of biodegradable polymers. Three standard polyurethanes with varying soft:hard segment ratios were synthesised and characterized via FTIR, 1H NMR and GPC. Phosphate-functionalised polyurethanes (GP-PU) …
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Biodegradation of benzene in soil systems
… addition and benzene concentration on the biodegradation of benzene in soil systems. More specifically, a primary objective was to correlate measurable soil properties with benzene biodegradation characteristics in the soil. Benzene biodegradation was measured in seven uncontaminated …
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Studies on lignin biosynthesis and biodegradation
For the first time, the bonding patterns of specific carbon atoms in woody plant lignin have been identified in situ. This was accomplished by administering and incorporating into the lignin fraction of Leucaena leucocephala, a tropical hardwood, ferulic acid enriched with ¹³C at either the 1-, 2-, …
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Biodegradation of Volatile Hydrocarbons in Estuarine Environments
… and microbial community composition. Aerobic biodegradation of all VOCs occurred in sediment slurries. More than 80% of the benzene, toluene and isoprene added was degraded within 10 days, while there was more than 40% degradation of ethane and propane within 37 days. Degradation of VOCs …
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Sorption and biodegradation of phenanthrene in soils
… the relationship between sorption and biodegradation on the ultimate fate of subsurface contaminants. Sorption and biodegradation of phenanthrene, a hydrophobic polycyclic aromatic hydrocarbon, were modeled using soil and water microcosms. The soils were prepared in the laboratory from …
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Strategies for Improving the Bacterial Biodegradation of PET
… content of aromatic terephthalate units. While biodegradation is an environmentally friendly method for tackling this waste, it is proven to be somewhat inefficient. One contributing factor is that the temperature required for bacterial growth is significantly lower than the glass transition …
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Biodegradation, surface rugosities and biofilm coverage of biopolymers
… and medical systems. This Thesis describes biodegradation of poly(3-hydroxybutyrate) (PHB), poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (P(HB-co-HV)), poly(3- hydroxyoctanoate) (PHO), poly-DL-lactide (PDLL), poly-DL-lactide-co-glycolide (PDLLG) and ethyl cellulose (EC). Polymers were buried …
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Methanogenic Paraffin Biodegradation and the Underlying Syntrophic Relationships
… concerns they pose when spilled. Methanogenic biodegradation through syntrophy plays an important role in their degradation, with implications for remediation and oil recovery. There is still much to learn about methanogenic biodegradation of recalcitrant hydrocarbons such as paraffinic …
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Ecological Aspects of the Biodegradation of Town Waste
… completed at this stage were applied to the biodegradation of the main component of domestic refuse which is cellulose. A screening programme revealed that thermophilic fungi, generally have a much faster growth rate than mesophilic fungi. In shake-flask cultures with suspensions of …
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Weed control efficacy and biodegradation characteristics of imazethapyr
The soybean herbicide imazethapyr (2-(4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl) -5-ethyl-3-pyridinecarboxylic acid) was evaluated in the field for weed control in soybean (Glycine max) during 1985 and 1986. Imazethapyr at 0.05, 0.07, 0.10, and 0.14 kg ai/ha was applied preplant …
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Biodegradation and Dewatering of an Industrial Waste Oil
… with sufficient air for mixing and oxygen. Biodegradation, and the role of a synthetic surfactant in promoting biodegradation, was measured using chemical oxygen demand (COD), fluorescein diacetate (FDA), and gas chromatography (GC) analyses with extractable material. Dewatering of …
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SYNTHETIC AND BIODEGRADATION STUDIES OF SOME SEDIMENTARY ISOPRENOID HYDROCARBONS
… of these new 'biomarker' hydrocarbons is made. Biodegradation of the synthetic alkanes and alkenes using pure cultures of the bacterium Pseudomonas aeruginosa indicated that the high abundance of the hydrocarbons relative to normal alkanes in certain environments is related to their resistance …
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Biodegradation studies of polyether polyurethane in a landfill site
… presents an evaluation of polyether polyurethane biodegradation based on a field study made at Baxenden Chemicals Limited, Accrington, England. The study of the landfill site of up to 100m 2 and 30m depth, has offered us the unique opportunity to investigate the fate of polyether polyurethane over …
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Substrate interactions during the anaerobic biodegradation of 1,1,1-trichloroethane
… the most important mechanism for the anaerobic biodegradation of highly halogenated aliphatic hydrocarbons. The concentrations of primary electron-donor and -acceptor substrates, which control the intracellular availability of electrons, can affect the rates of these reactions. A mechanism-based …
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Biodegradation of pesticide and indolic compounds under methanogenic conditions
Degradability of atrazine, cyanazine, and dicamba under methanogenic conditions was evaluated using serum bottle microcosms containing wetland soil inocula obtained from three different sites. Pesticides were monitored by high-performance liquid chromatography (HPLC) and the production of methane …
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