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 30 for “"biosorption"”.
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Extraction, characterisation and metal biosorption of extracellular polysaccharides from activated sludge
Dissertation submitted in compliance with the requirements for the Master's Degree in Technology : Biotechnology, Technikon Natal, Durban, South Africa, 1998.
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Biosorption of uranium and its effect on uranium transport in groundewater
… research was to determine the effects of uranium biosorption on the overall transport of uranium by understanding the solution chemical equilibrium and its effects on modeling sorption. This was done by first evaluating the uncertainty associated with uranium equilibrium speciation and its effect …
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Optimization of biosorption process using cucumis melo rind for the removal of Fe, Mn and Pb ions from groundwater
Biosorption can be an effective technique for the treatment of metal-bearing groundwater. Several fruits and agricultural by-products demonstrated the ability to remove the heavy metals and thereby reduce the water contaminants. In the present study, the potential use of biosorbent material …
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Uptake of manganese into the exoskeleton of the swimming crab Liocarcinus depurator (L.) in relation to biomonitoring and biosorption
… carapace to remove Mn from aqueous solution in a biosorption column system in the remediation of contaminated waters was also investigated as an attempt to turn this un-commercial species into beneficial use. Measured using standard atomic absorption spectroscopy (AAS), the concentrations of Mn in …
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Utilisation de résidus de bacillus subtilis comme matrice de bio-adsorption de métaux
… à ces techniques serait l'utilisation de la biosorption qui implique plusieurs processus chimiques tels que l'échange d'ions, l'adsorption et la liaison covalente entre les métaux d'une solution et les sites de biosorption d'une biomasse morte ou vivante à faible coût. Pour notre recherche, …
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Natural biosorbents for the removal of metals from aqueous solutions
… concentrations. Recent research has shown that biosorption by low cost biomass can be an effective alternative. Biosorption is the passive (non-metabolic) uptake and concentration of metals by non-viable biological materials. In this work, natural materials and shellfish processing wastes were …
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Sequestration of metal and metalloid ions by thermophilic bacteria
… were selected to describe further biosorption reactions between cadmium ions and chemically reactive functional groups (potential ligands) within and onto the bacterial cell walls. Data obtained from electrophoretic mobility, potentiometric titration and cadmium ion adsorption …
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The influence of zinc on the physiology of industrial strains of <i>Saccharomyces cerevisiae</i>
… This stage of uptake is often referred to as biosorption and zinc uptake is influenced by temperature, pH, biomass concentration and the presence of competing ions. The second phase of zinc uptake (metabolism-dependent metal ion accumulation) concerns the intracellular accumulation of the …
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Untersuchungen zum Verhalten von Schwermetallen in kommunalen Kläranlagen unter besonderer Berücksichtigung der Metallanreicherung an Belebtschlämmen
… Herkunft und Zusammensetzung wurden die Biosorption von Cd und Cu vergleichend betrachtet, die Anreicherungsmechanismen charakterisiert sowie der Einfluß von Exopolysacchariden auf die Anreicherung geprüft. Im Zulaufder Kläranlage lag eine überproportional hohe Cu- (249 myg/l) und eine …
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Metal contamination and methane oxidising bacteria around a formerly industrialised suburban river.
… or all of the chromium removal could be due to biosorption and uptake into the cells e.g. via the sulphate transport pathway. It was also found that the removal of Cr (VI) was inhibited by the addition of the metabolic inhibitor sodium azide, thus indicating that removal of chromium is largely a …
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Metal contamination and methane oxidising bacteria around a formerly industrialised suburban rive
… or all of the chromium removal could be due to biosorption and uptake into the cells e.g. via the sulphate transport pathway. It was also found that the removal of Cr (VI) was inhibited by the addition of the metabolic inhibitor sodium azide, thus indicating that removal of chromium is largely a …
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Estudio de procesos para la solubilización y precipitación de iones metálicos contaminantes mediante bacterias azufre-oxidantes y sulfatoreductoras
… are relevant.Techniques as bioleaching, biosorption and bioprecipitation apply the microorganism capacities to modify the solubility of heavy metals.Bioleaching consists of the solubilization of heavy metal ions from insoluble compounds. Among the microorganisms that have this capacity, …
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An investigation into the enzymatic activity of deepsea actinobacteria in decolourising crystal violet dye
… to decolourise CV by either biodegradation or biosorption. Gordonia sp. JC 51 was selected as a candidate for further study as it could decolourise CV efficiently and could tolerate high concentrations (1mM) of CV. A combination of spectral scan studies, dye decolourisation, biodegradation …
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Biotreatment of waste streams containing isopropyl alcohol and copper from semiconductor manufacturing
… the results of previous research studying the biosorption of copper on immobilized cells, a system for the simultaneous removal of IPA and copper was tested experimentally. After acclimation, the system was able to treat effectively a model wastewater containing 100 ppm of IPA and 50 ppm of …
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Engineering functional biomaterials to advance environmental and resource sustainability
… forms. In recent years, protein-based biosorption and biocatalysis have emerged as promising alternatives to conventional methods due to their inherent advantages, such as strong substrate affinity, selectivity, rapid adsorption kinetics, potent enzymatic activity, and minimal energy …
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Improvement of a cell-based test system for the biological assessment of plastics for use in single-use bioreactors
… to different leachables was assessed. Results of biosorption experiments indicate an increased affinity towards hydrophobic leachables and the highest adsorption coefficient was determined for bDtBPP for both cell types.
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Interaction of zinc with the yeast <i>Saccharomyces cerevisiae</i>
… rather than via a cell surface biosorption phenomenon. After initial periods of cellular zinc accumulation, and during the course of the subsequent fermentation, zinc became virtually undetectable in wort. As yeast cells grew during this period, zinc was distributed to daughter …
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