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 646 for “"Pretreatment"”.
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Pretreatment and enzymatic hydrolysis of lignocellulosic materials
… parts: (a) comparison of efficiency of different pretreatment methods on lignocellulosic materials; and (b) enhancing enzymatic hydrolysis in a continuous tubular membrane reactor (TMR) process.;The alkaline oxidation pretreatment method was found to be more efficient than ammonia steeping …
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Assessing Biofiltration Pretreatment for Ultrafiltration Membrane Processes
… effectiveness. The impact of biofiltration pretreatment on UF membrane performance was evaluated holistically by investigating the native source water chemistry and extending the analysis into the drinking water distribution system. The biofiltration process was also compared in treatment …
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Switchable butadiene sulfone pretreatment of lignocellulosic biomass
… the source of value-added products. “Pretreatment” is the term that describes the chemical, physical or physicochemical process that breaks the structure of biomass prior to further processing, and represents the most expensive step in the production of biofuels. Towards a more …
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Pretreatment Characteristics of Legally Coerced Drug Treatment Seekers
… coercion on gender, age, educational status, pretreatment criminality and current treatment modality. In addition, differences between the legally coerced and not legally coerced clients varied across geographic regions.</p>
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Effect of Coagulation Pretreatment on Membrane Filtration Performance
This research accomplished two significant goals with important implications for the water treatment industry. First, an understanding of the conditions under which coagulation can improve membrane performance has been developed. Improved understanding of this relationship allows microfiltration …
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Effects of catalyst pretreatment for carbon nanotube growth
The effects of pretreatment of iron catalyst for carbon nanotube (CNT) growth was studied. CNTs were grown on Fe/A1203 (1/10 nm) thin-film catalyst deposited on silicon substrates via exposure to C2H4 in a thermal chemical vapor deposition (CVD) furnace. During CVD, the sample was exposed to a …
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Performance Characterization of Coagulation Pretreatment for Two Industrial Effluents
In this work, performances of coagulation and flocculation were tested for two different industrial effluents. Coagulation-Flocculation and activated carbon adsorption were applied for the remediation of oil sands process-affected water (OSPW), generated from oil sands operations in Alberta, …
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Biomass pretreatment toward efficient hydrolysis for sustainable biofuel applications
… degradation often requires severe and costly pretreatment processes such as heat, physical and chemical treatments to disturb and fractionate the biomass. Significant research effort has been devoted to understanding the recalcitrant nature and to accelerate the commercialization process of …
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Pretreatment and hydrolysis of recovered fibre for ethanol production
… exploitation of biomass materials requires a pretreatment to disrupt the lignin and cellulose matrix. The pretreatment utilized for this research was oxygen delignification, which is a standard process stage in the production of bleached chemical pulp. The model substrate utilized as a …
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Purification of C-phycocyanin from Spirulina - adsorption pretreatment options
… research, it was recommended that an adsorption pretreatment be incorporated into the process prior to the ATPS and precipitation to improve the C-PC purity entering these stages. This adsorption pretreatment was proposed to use chitosan and activated charcoal due to the potential they have shown …
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Improving Anaerobic Digestion of Sewage Sludge Using Free Ammonia Pretreatment
… is also the limiting factor. Free ammonia (FA) pretreatment has been recently revealed as a promising approach to improve the biochemical methane potential and hydrolysis rate of sewage sludge through small-scale batch studies. However, a comprehensive understanding of the impact of FA …
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Performance and microbial community structure of Midwestern groundwater pretreatment reactors
… in order to meet disinfection requirements, so a pretreatment configuration is the one of the few feasible locations for biological activity. Parallel fixed-bed column reactors were operated in order to investigate the applicability of biological pretreatment for Midwestern groundwater containing …
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Two-stage acidic-alkaline pretreatment of Miscanthus for bioethanol production
Pretreatment is the rate-limiting step for bioethanol production from lignocellulosic biomass, and subsequently intensive studies have been undertaken to improve the pretreatment efficiency. However, so far most pretreatment methods failed to achieve desirable sugar recovery from both cellulose and …
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Increasing dry grind ethanol yield through fiber pretreatment after liquefaction
… study were to study the effects of hot water pretreatment, disk milling and cellulase dose on conversion of corn fiber into ethanol and to modify the conventional dry grind process for converting corn fiber into ethanol. Mash obtained after liquefaction was filtered and retentate (referred to …
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Investigating pretreatment methods for struvite precipitation in liquid dairy manure
… of this study was to investigate different pretreatment methods to enhance struvite precipitation in dairy manure. Generally there are two challenges that need to be overcome to precipitate struvite in liquid dairy manure. The first is the relatively high calcium (Ca) concentration. The …
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Anaerobic/aerobic pretreatment of blue crab (Callinectes sapidus) cooker wastewater
Wastewater from the pressure cooking of blue crabs presents a difficult treatment challenge. COD concentrations in the range of 15,000 to 30,000 mg/L are found in this wastewater, with TKN concentrations above 2,000 mg/L. Direct discharge of the wastewater, which is currently allowed, adds …
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Rare Earth Extraction from Clayey Waste Materials by Alkali Pretreatment
… a novel leaching process consisting of NaOH pretreatment followed by ammonium sulfate leaching has been proposed to recover REEs from monazite, which served as a proxy for the rare earth phosphates identified in coal-based clays. In this process, monazite can be decomposed at 80 oC. The …
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Granular activated carbon pretreatment for the removal of trihalomethane precursors
Granular activated carbon (GAC) pretreatment was evaluated for the removal of trihalomethane (THM) precursors from a surface water supply, the Occoquan Reservoir, in northern Virginia. The carbon contactors were operated in the upflow mode at flow rates of 2, 4, and 6 gpm which provided empty bed …
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