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 42 for “"Digestate"”.
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Comprehensive evaluation of cow dung digestate composition for potential soil fertilization: Advanced analytical techniques
Cow dung digestate, a nutrient-rich byproduct of anaerobic digestion, offers a sustainable alternative to synthetic fertilizers, aligning with the United Nations Sustainable Development Goals (SDGs), particularly Goal 2 (Zero Hunger) and Goal 13 (Climate Action). This study aims to evaluate the …
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Optimization of Phosphorus Removal and Mineral Characterization in Aerated Anaerobic Digestate with Divalent Cation Addition
Struvite and other minerals often form at WRRFs when phosphorus-rich activated sludge from EBPR processes undergo anaerobic digestion. Without proper control, these minerals can cause scale deposits that clog pipes and damage dewatering equipment. However, managing when and where these minerals …
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Optimisation of anaerobic digestion of organic solid waste for the production of quality compost for soil amendment
… qualities of the resulting post treated digestate (anaerobic digestate compost). This study investigated suitability of laboratory simulated feedstock for biogas and compost production and the impacts of the compost produced on physical, chemical and biological properties of soil. The …
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Linking microbial community dynamics and performance of a biological sulphate reducing system using a mixed volatile fatty acid stream as electron donor
… Firstly, to evaluate the use of an anaerobic digestate, obtained from a partially anaerobically digested Cyanobacteria species (Arthrospira platensis, commonly known as Spirulina), as a carbon source and electron donor for BSR. Secondly, to validate, optimise and apply the molecular tools for …
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Evaluation of Sewage Digested Sludge Conditioning and Dewatering Through Qualitative and Quantitative Laboratory Methodologies Towards Process Monitoring
… AD (CMAD) on conditioning and dewatering of the digestate, as this knowledge seemed to be lacking for an AAD technology that is increasingly being implemented. An additional contribution to knowledge from this study relates to the evaluation of how polymer conditioning and dewatering of digested …
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Phosphorus speciation, agronomic performance and soil nutrient testing for waste recovered fertiliser use in Northern Irish soil
… to reduce pathogen content and waste volume. The digestate end product is a nutrient rich organic source which has the potential to supply local agriculture with P. <br/><br/>In this PhD, experimental platforms have been developed to assess the most effective way to measure soil test P (STP) in …
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Optimization of Growth Parameters for Algal Regrowth Potential Experiments
… for algal cultures was also conducted. The digestate (diluted 50% v/v with a saline make-up) grew significantly faster than the controls (p-value<0.001). Further, after the introduction of trace metals and micronutrients the digestate columns outlived the control columns increasing the …
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Improved Polyhydroxyalkanoate Production from Selected Volatile Fatty Acids using Cupriavidus necator
… profile.<br/><br/>The novel use of low cost digestates based media was demonstrated. Results demonstrated that possibly due to the nutrients/trace elements in a digestate (from food wastes and wheat feed) the PHA accumulation was enhanced by 3-fold (to 12.29 g/l); with a resulting highest …
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Geochemical changes, plant growth and ecosystem recovery in soils after high temperature remediation
… organic soil conditioners (compost and anaerobic digestate) were used to improve the yield of biomass crops. In a calcium-rich topsoil, toxic conditions generated during smouldering (pH>11) were too severe and biomass crop growth could not be established. In a nutrient-poor soil, higher levels of …
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Effects of Raceway Pond Water and Nutrient Recycling on Microalgae Production and Harvesting
… anaerobically-digested algal biomass (algae digestate) and the other set chemical fertilizer. Both recycling raceway sets were monitored to determine if water and nutrient recycling had any detrimental impacts on algal biomass growth.</p> <p>Productivity was reported as gross and net in terms …
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The Effect of Destoning and Enzymatic Pretreatments on the Biofuel Production from Olive Cake
… suitability for biomethane production. The digestate, residue from the anaerobic digestion, have high Kjeldahl nitrogen content (3.6%, db) and low polyphenol concentration (0.02 mg GAE/g), which then qualify it as an ingredient for soil amendment. Ethanol production investigations showed …
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Ecosustainable biomethane and fertilizerproduction through anaerobic co-digestionof animal manure and energy crops
… involving post-methanation emissions from the digestate storage; 3. ammonia emissions from the storage and land spreading of digested materials, low fertilising efficiency of manure and digestate, nitrate contamination of groundwater. The described emissions and energy inefficiency could …
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Production of biofuels in a circular cascading bio-based energy system
… and value-added pyrochar via pyrolysis of solid digestate, were proposed to produce sustainable biofuels, namely biogas and biomethane. The preliminary energy analysis revealed that the proposed system could increase final net energy output by 70% as compared with a conventional biomethane system …
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6- and 5-Halodecaboranes: Selective Syntheses From ClOSO-B10H10(2-) and Use as Polyborane Building Blocks
… digestion of the polymer, complexation of the digestate with a base, reduction of B-X bonds to B-H bonds, and finally displacement of the base with ammonia. While digestion schemes proved unable to digest all forms of the dehydrogenated materials, portions of the polymer digested to …
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Improving the anaerobic co-digestion of pelagic Sargassum and food waste into biogas and a bio-fertiliser using hydrothermal pre-treatment: Concept to application in the Caribbean
… effluent of biogas production, a solid-liquid digestate, is nutrient-dense and pathogen free, exhibiting application in agricultural practice as an organic bio-fertiliser or soil conditioner. Presently, research on the hydrothermal pretreatment of pelagic Sargassum and its co-digestion with …
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Development of a Conceptual Framework for Adoption and Sustainable Utilization of Biogas as an Alternative Source of Energy for Emmission
… Fermentation also produces a nutrient-rich digestate. Biogas can be used for domestic purposes, such as cooking and heating. Furthermore, it can be converted into electricity. Biogas technology is of particular significance in rural households, where energy crisis are common. This thesis …
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Harnessing <i>Haloferax mediterranei</i> for Bioplastic Production from Organic Waste
… generation. Then, ex-situ VFA recovery from digestate was experimentally evaluated using hydrophobic deep eutectic solvents with omniphobic membranes, and kinetic-affinity relationships guided the separation design. To bypass VFA purification needs, in-situ VFAs produced from arrested …
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Molecular characterization of microbial communities in small-scale biodigesters using whole genome shotgun metagenomic approach
… acetogenesis, and methanogenesis, resulting in digestate and biogas production. Advances in metagenomic techniques, surpassing traditional culture-based methods, have enabled a deeper characterization of the microbial populations involved in this process. However, a knowledge gap remains …
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Production of biogas from sugarcane wastes: an assessment of microbial community dynamics for an efficient process
… commodities such as energy-rich biogas and digestate with fertilizer properties. Additionally, the proper treatment of the four major waste types (straw, bagasse, filter cake and vinasse) would avoid greenhouse gas emissions, air pollution and environmental contamination of soil and water. …
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Green grass: developing grass for sustainable gaseous biofuel
… research in enzymatic hydrolysis and for use of digestate in added value products.
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