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 24 for “"biohydrogen"”.
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Biohydrogen production in Escherichia coli – a synthetic biology approach
… component of agricultural fertilizers.<br/>Biohydrogen (Bio-H2) is molecular hydrogen produced by microorganisms and is an exciting prospect as a fully renewable, commercially-viable second-generation biofuel. Bio-H2 can be produced at ambient temperatures by metal-dependent hydrogenase …
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Experimental investigation of integrated systems for biohydrogen and biomethane production
This thesis study presents two unique systems for biohydrogen (bioH2) and biomethane (bioCH4) production. The first system consists of a single-chamber cylindrical membraneless the microbial electrolysis cell (MEC), while the second system is an MEC-anaerobic digestion system. The system 1 …
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Experimental investigation of dark fermentation of poplar leaves for biohydrogen production
Biohydrogen, a sustainable and environmentally friendly energy alternative, is pivotal in transitioning to a more energy-efficient future. Thesis research explores the variations of H2 hydrogen production potential of poplar leaves as a substrate for biohydrogen production via dark fermentation, an …
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Biohydrogen as a Fuel: Understanding and Engineering Hydrogenase Enzymes for Biotechnological Applications
… new, more suitable modes of H2 derivation. Biohydrogen – i.e. H2 derived from cellular metabolism – is a particularly promising future fuel, owing to it being a truly renewable means to generate H2 that would contribute to neither pollutant nor greenhouse gas emissions. The predominant …
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Enhanced biohydrogen production and substrate utilization by co-culture fermentation with reduced extracellular electron shuttles
… However, three key challenges for large-scale biohydrogen production are to increase i) the hydrogen production rate, ii) the hydrogen molar yield, and iii) the extent of substrate utilization. A co-culture system of C. beijerinckii and G. metallireducens with extracellular electron shuttles …
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Life cycle sustainability assessment of next generation energy infrastructure in Africa: Is there a case for biohydrogen after biomethane?
… show that the dark fermentation process for biohydrogen production faces several challenges such as low yield and slower production rate. Furthermore, it is unclear whether the biohydrogen production technology offers potential benefits in terms of ecological and socioeconomic sustainability. …
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Biorefining Sewage for Energy and Green Chemicals
… products. During the intermediate stages of AD, biohydrogen and volatile fatty acids (VFAs) are produced which are gaining increased attention due to their higher energy density and higher market value, respectively.<br/><br/>For their production to be adopted at industrial scale however, the …
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Utilisation of biomass-derived gaseous fuels using solid-oxide fuel cells
… supported (ESC) button cells. The utilisation of biohydrogen and biohythane mixtures have been investigated in fuel cell, electrolysis and co-electrolysis modes. Cell electrical performance was characterised using potentiostatic techniques and fuel processing was characterised using online …
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Performance analysis of bioanode materials and the study of the metabolic activity of Rhodopseudomonas palustris in photo-bioelectrochemical systems
… to carbon sources (N:C) to maximise both biohydrogen production and exoelectrogenesis for conversion into bioelectricity in photosynthetic microbial fuel cells (photoMFCs). A linear correlation was obtained between average surface roughness/surface area and maximum power density of …
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Karanlik fermentasyon ile biyohidrojen üretiminde pH kontrolü
… of pH value of a batch bioreactor in which biohydrogen was produced from potato medium using Clostridium butyricum microorganism under anaerobic conditions was performed. In order to reach the maximum growth rate and production amount in the bioreactor, the process should be operated at the …
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Improving the bioconversion of lignocellulosic feedstock to bio-fuels and chemicals
… on the pattern of degradation. The two-stage (biohydrogen-biomethane) anaerobic system was found to be more effective in the degradation of lignocellulose, when compared to the conventional single-stage system. The perennial rye grass substrate possessed about 21% higher holocellulose …
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The economics of biological methods of hydrogen production
… ability to produce hydrogen and developing biohydrogen plants whose economics compete with current commercial plants are key hurdles that must be overcome. Economic models for the production of hydrogen through biological systems are examined in detail in this thesis. The key technical …
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Application of physicochemical and biological pretreatments to enhance volatile fatty acids production via Dark Fermentation from agri-food waste
… (HTP) to optimize the sequential production of biohydrogen (H2) and (VFA) within a biorefinery framework, as detailed in Article 3 and Article 4. pretreatment effectively enhanced the solubilization of organic matter, serving as a crucial first-stage intensification method prior to (DF). …
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Coenzyme engineering of NAD(P)+ dependent dehydrogenases
… production of low-value biocommodities (i.e., biohydrogen). There is a significant need to first address the coenzyme selectivity of the NADP-dependent dehydrogenases and evolve mutated enzymes that accept biomimetic coenzymes. This is a major focus of this dissertation. Establishment of …
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Synthetic enzymatic pathway conversion of cellulosic biomass to hydrogen
… highest possible yield and rates as high as any biohydrogen production method.
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Reduced extracellular electron shuttles increase hydrogen production and substrate utilization in pure culture Clostridium beijerinckii fermentation
… shuttles to develop better strategies to extract biohydrogen from the lignocellulosic materials by allowing us to manipulate the fermentative metabolism at the physiological level.
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The viability and public perception of the introduction of bio-hydrogen technology to Wales with specific reference to anaerobic dark fermentation of agricultural crops
… under this MPhil study was the quantification of biohydrogen potential from crops available in the UK and undertaken as part of the UK SHEC work package. This is the first time this has been calculated and this work was done in order to determine whether it is energetically feasible if performed …
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Improving the Hydrogen Yield of Microbial Electrolysis Cell with Facilitated Electron Transfer Using Mediators, Choice of Environmental Conditions and Anode Treatment with Conductive Materials
… fermentative conversion of organic substrate to biohydrogen produces volatile fatty acid (VFA) rich effluents, typically a 40 % acetate and 60 % butyrate mixture. These VFA products can be used as feedstock for microbial fuel cells (MFC), to recover more energy as electricity, or microbial …
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Development of Rhodopseudomonas palustris as a chassis for biotechnological applications
The recent surge in biodiesel production has resulted in a huge surplus of crude glycerol, a by-product of the process to the level of 10% by weight. This is turn has caused the price of glycerol to fall dramatically, and there are now few economically viable channels for using this resource: waste …
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