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 40 for “"biomethane"”.
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Biomethane production from macroalgae
… for handling such wet feedstock. However, the biomethane potential of seaweed is highly dependent on its chemical composition which can vary by species type, cultivation method, and time of harvest. This study aims to investigate and optimize the process for the production of biomethane from …
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Enhancing biomethane production from anaerobic digestion of Sargassum muticum
Higher methane yields from the anaerobic digestion (AD) of Sargassum muticum could improve the process energy balance and make its use during AD more economical and energetically favourable. Previous research showed that after 28 days of AD, methane yields from S. muticum were low (17% of the …
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Experimental investigation of integrated systems for biohydrogen and biomethane production
… 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 investigates the effects of …
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Biomethane production from grass silage: laboratory assessment to maximise yields
… fuel an anaerobic digestion industry. Biomethane associated with biomass from 1.1 % of grassland in Ireland, could potentially generate over 10 % renewable energy supply in transport. This study aims to identify and optimise technologies for the production of biomethane from grass …
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Biomethane Recovery Potential from Brewer’s Yeast Using Two-Stage Anaerobic Digestion
… and two-stage anaerobic digestion process using Biomethane Potential Assay on RBY has been performed to assess the methane production from RBY. Before setting up a two-stage reactor, the RBY was pre-treated using the High-Rate Hydrolysis/Acidification (HRHA) process to further evaluate the effect …
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Ecosustainable biomethane and fertilizerproduction through anaerobic co-digestionof animal manure and energy crops
… choice for biogas valorisation could be biomethane production (also called green gas) through biogas purification and upgrading processes in order to remove CO2 and trace components. Biomethane production and its injection into natural gas grid (or its use as a transport vehicle fuel) …
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Optimal Location of Biomethane Gas Manufacturing Plants and Allocation of Feedstock and Liquified Carbon Product
Biomethane gas (BMG), known for its sustainability, low environmental impact, and high profitability, has received wide attention in recent years. To facilitate the process of making strategic plans for building a BMG production system, this dissertation leverages the mathematical modeling and …
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The Effect of a Trace Element Supplement on the Biomethane Potential of Food Waste Anaerobic Digestion
… element was determined by the gas density-based biomethane potential method at mesophilic (37°C) conditions over 30 days. The three treatments were inoculum only, food waste and inoculum, and food waste and inoculum with an added trace element solution. There was no significant difference between …
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Life cycle sustainability assessment of next generation energy infrastructure in Africa: Is there a case for biohydrogen after biomethane?
The recovery of energy in the form of biomethane gas from inexpensive biodegradable organic wastes is starting to become a cornerstone of green economy investments. It is possible that such installations could serve as a precursor for the infrastructural development of a hydrogen economy, since …
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Recovering biomethane from fats, oils, and greases: Examining the impacts of microbial ecology on anaerobic codigester stability and bioconversion kinetics
Recovering biomethane with anaerobic digestion is of global interest to reduce carbon footprints and improve process economics for the treatment of organic wastes. Fats, oils, and greases (FOG) are desirable co-substrates for biomethane recovery because they have a substantially higher energy …
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The Effect of Thermophilic Anaerobic Digestion on Ceftiofur and Antibiotic Resistant Gene Concentrations in Dairy Manure
… use in animals can cause negative effects on biomethane production during anaerobic digestion. Previous literature has found decreased biomethane production rates from a variety of antibiotics, but biogas inhibition differs between studies of continuous and batch reactors and the type of …
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Sequential temperature phased enhanced anaerobic digestion using bioaugmentation microbes to enhance biomethane production from alkali pretreated late cut grass and late cut grass silage
… greenhouse gas emissions. Apart from producing biomethane that can substitute for fossil derived natural gas, heat and electricity, the digestate from the anaerobic digestion process can serve as biofertilizer that can also replace fossil-based fertilizer usage. Anaerobic digestion in most …
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The Effect of Destoning and Enzymatic Pretreatments on the Biofuel Production from Olive Cake
… has potential for biofuel (bioethanol and biomethane) production because it is rich in polysaccharides such as pectin, hemicellulose, and cellulose. Yet, olive cake contains olive stones that can impede its conversion to biofuel. Therefore, two methods of destoning, centrifugation and …
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Integration of anaerobic digestion with bio-electrochemical technologies in cascading circular bioeconomy systems producing biofuel and chemicals
… pollution whilst simultaneously generating biomethane (a clean energy source which can be used as a direct replacement for natural gas), biofertilizer (which can reduce fossil fertiliser use), and biogenic CO2 (which can be further valorised). However, many anaerobic digestion systems are …
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Production of biofuels in a circular cascading bio-based energy system
… 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 if the electricity used to produce hydrogen is assumed to be otherwise …
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Technical and economical evaluation of Power-to-Methane technologies, based on green H2 and biogenic CO2
… of green fuels, such as hydrogen (H2) and biomethane (CH4), exploiting Renewable Energy Sources (RES) and biogenic CO2. In the frame of the Sardinia energy scenario, one of the biggest islands in Italy, the only one without a natural gas grid and, at the same time, a high availability of …
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International biogas applications
… waste and sewage sludge for the production of biomethane as a transport fuel can be economically feasible. The co-digestion of food waste and pig slurry appear less profitable due to higher operational costs and reduced gate fees. The implementation of economic instruments can help increasing …
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An update on the process economics of biogas in South Africa based on observations from recent Installations
… Heat and Power (CHP) system, and biogas-to-biomethane. Regression analysis was carried out on the observed costs, and this was used to predict future costs. A capacity-cost factor of 0.68 for biogas-to-electricity and 0.57 for biogas-tobiomethane was obtained. Statistical hypothesis testing …
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Improving the Environmental and Economic Sustainability of Dairy Farming using Value-Added Products derived from the Anaerobic Digestion of Manure
… for co-digestion with dairy manure to increase biomethane production at the on-farm AD. The effective pasteurization temperature and duration to reduce fecal coliform, E. coli, and Salmonella concentrations in the AD effluent to acceptable levels for use as an organic fertilizer were determined. …
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Biorefining Sewage for Energy and Green Chemicals
… VFA yields in the first stage and overall biomethane yields in the second stage. It was shown that a two-stage fermentation of PS successfully enhanced biomethane yields by up to 19.14%. Also, a first-stage HRT of 5 days achieved the highest mean total VFA yield of 95 gvfa kgvs-1 as well as …
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