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 25 for “"biological degradation"”.
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A Pore Scale Study of Substrate Mixing and Biological Degradation in Porous Media
Finally, degradation rates obtained from a simple continuum model with uniform flow field are compared to results from the full pore scale model. Substrate degradation rates are consistently underpredicted when transverse dispersion coefficients obtained from nonreactive transport simulations are …
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Applications of aerobic and anaerobic bacteria in the fields of biological degradation of contaminants and biological wastewater treatment
… The first problem was an investigation into the degradation of Dichloroethylene (DCE) and 1,1-bis (p-Chlorophenyl)-2-dichloroethylene (DDE) utilising pure bacterial cultures. The second investigation dealt with the degradation of DDE and polychlorinated Biphenyl’s (PCB’s) utilising anaerobic …
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Biological degradation of soluble microbial products in a combined system of anaerobic packed-bed reactors and a down-flow hanging sponge reactor
Anaerobic biological processes are a reliable alternative to the conventional activated sludge process for the treatment of high-strength industrial wastewater, offering various advantages. Such advantages include, for example, less sludge generation, less operational cost, greater energy recovery, …
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The Threat and Cascade Method of estuarine health assessment: a logical sequence from human impact to biological degradation via system physics and chemistry
A methodology for the comparative assessment of estuarine health over a range of systems is presented. It is based on the assumption that anthropogenic impact is the causative variable when considering negative impacts on estuarine health. The methodology follows a logical cascade of estuarine …
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Aspects of the biogeochemistry of carbohydrates in aquatic environments
… How do metal-carbohydrate interactions and biological degradation affect the diagenesis of carbohydrates in recent sediments? Can fossil carbohydrates be used as a means to elucidate paleo-environments? In order to investigate these questions in a quantitative manner, a liquid …
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Investigation into the bioremediation and benefication of olive-derived wastewaters from the Western Cape
… operations, such as an extraction system and a biological degradation system, would allow for the recovery of a valuable product that would offset the cost of producing a treated effluent.
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Effects of biologically produced surfactants on the mobility and biodegradation of petroleum hydrocarbons
… was conducted to determine the effects of biologically produced surfactants (biosurfactants) on petroleum hydrocarbons and their potential for the removal of hydrocarbons from groundwater systems. Bioaurfactanta have been found to be produced by microorganisms during growth on insoluble …
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Anaerobic/aerobic degradation of a textile dye wastewater
… dye wastewater. Both anaerobic and aerobic biological degradation of azo dyes have been reported in the literature; the rate and extent of degradation is often quite dye-specific. This research utilized laboratory-scale reactors to investigate the effectiveness of those treatments, both …
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Light Enhanced Toxic/tumorigenic Potential of Trinitrotoluene (Tnt) and Analogs
… concentrations and their production during biological degradation of TNT related waste must be considered. Binary mixtures of TNT, 2A or 4A demonstrated a more than additive toxicity towards the Microtox reagent with nUV coexposure. 2A and 4A also proved to be developmental toxicants towards …
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Chemical reduction and oxidation combined with biodegradation for the treatment of a textile dye wastewater
… the reduced wastewater was inhibitory to biological degradation. Additional tests were conducted with sodium hydrosulfite. These included reductions followed by pH adjustment, nutrient addition, pH adjustment and nutrient addition, and lime addition. These tests were also successful in …
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The effect of alternative electron acceptors on the subsurface biodegradation rates of methanol and tertiary-butyl alcohol
… study evaluated the potential for increasing the biological degradation of methanol and tertiary-butyl alcohol (TBA), components of a gasoline-alcohol blend, in the subsurface by stimulating the growth of the microorganisms. The primary objective of this study was to evaluate the stimulatory …
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Removal of Endocrine Disrupting Compounds Using Membrane Bioreactor
… a challenge due to their resistant chemical and biological degradation and extreme low concentrations. Membrane bioreactor (MBR) used in this study is novella better water reclamation technology that shows several advantages including stable operation conditions due to long solid retention time …
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Bioavailability of dissolved organic matter in coastal waters
… bacteria and a refractory part that resists biological degradation.<br/>In this study the seasonal variation in bioavailability of DOM was quantified in two contrasting marine systems: Loch Creran (Scotland) and the Ría de Vigo (Spain). The bioavailable DOM (BDOM) varied temporally at both …
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Biodegradation of organic contaminants in subsurface systems: kinetic and metabolic considerations
… bacteria to man-made organic chemicals or the degradation rates of these compounds. Such information would be useful in planning cleanup or protection strategies for groundwater systems. This study was designed to measure the kinetic response of tertiary butyl alcohol (TBA), determine the …
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The Reaction of Aqueous Free Chlorine With Organic Compounds Adsorbed on Granular Activated Carbon
… organics are often resistant to biological degradation and some may pose a health risk. Capillary and packed column gas chromatography were used to examine whether unique organic compounds were formed by the reaction of chlorine with adsorbed humic materials. At no time during the …
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Farm waste management: the effects of fine bubble aeration on cattle slurry and the fate of ammonia during the treatment process
… during treatment to establish the chemical and biological changes. Finally, the effect of aeration on the fertiliser value of the treated slurry was studied. Experiments at laboratory-scale showed that N was released as NH 3 within the exhaust gases and that there were major changes in the …
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Characterization of Environmentally Friendly Polymers: Amylopectin and Its Blends
… as in packaging, agriculture, and medicine. Its biological degradation by microorganisms accelerated the interest in biodegradable polymers during the last decades. Within this group of innovative environmentally friendly biodegradable polymers, starch or Amylpectin plays a predominant role, due …
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Profiling of Microbial Communities, Antibiotic Resistance, Functional Genes, and Biodegradable Dissolved Organic Carbon in a Carbon-Based Potable Water Reuse System
… contaminants of emerging concern (CECs), through biological degradation or transformation. In this dissertation, various aspects of the operation of a microbially-active carbon-based advanced treatment train producing water intended for potable reuse are examined, including fate of dissolved …
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Anaerobic and Combined Anaerobic/Aerobic Digestion of Thermally Hydrolyzed Sludge
… to anaerobic digestion increases the biological degradation of organic volatile solids and biogas production. The thermal hydrolysis process destroys pathogens and hydrolysis makes the sludge readily available for digestion, while at the same time facilitating a higher degree of …
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