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 34 for “"methane yield"”.
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The Effect of Pretreatment Methods on Methane Yield and Nutrient Solubilization During Anaerobic Digestion of Microalgae
… biodegradability, which was assessed in terms of methane yield, volatile solids destruction, and solubilization of N, P, and K. The microalgae were harvested by sedimentation from outdoor wastewater-fed raceways ponds operated in coastal southern California. Four pretreatment methods (sonication, …
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Improvement of the digestion of cattle slurry via the process of co-digestion
… rates tested with the greatest volumetric methane yield, 1.46 l l-1 d-1, produced at a 5 g VS l-1 d-1 OLR consisting of 40% cattle slurry; this corresponded to a specific methane yield of 0.26 l g-1 VS added. Successful digestion was shown at retention times as low as 15 days where a …
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Bioenergy Recovery from Bulk Greenhouse Waste and Raw Sewage Sludge
… of GCW with RS is first investigated and the methane yield is compared for different mixing ratios. Results reveal that with higher concentrations of GCW in the substrate mix, the methane yield per mass COD of substrate added is improved by 13 – 27% as compared to the mono-digestion of RS. …
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The Effect of a Trace Element Supplement on the Biomethane Potential of Food Waste Anaerobic Digestion
… zinc, calcium, copper, manganese, cobalt) on the methane yield and organic waste destruction of anaerobically digested food waste. Methane yield of food waste with and without the inorganic salt trace element was determined by the gas density-based biomethane potential method at mesophilic (37°C) …
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Kinetic Parameters in Thermophilic Methane Fermentation of Swine Manure
… of about 10%, of which 85% were VS. The ultimate methane yield of the manure (0.508 L CH(,4)/g VS fed) was determined by extrapolation using steady-state data. Inhibition played a significant role in the determination of the ultimate methane yield. A hypothesis was set forth to describe the …
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STUDY OF BIOGASIFICATION OF COAL TO METHANE FOR EX SITU AND IN SITU APPLICATIONS
… was investigated for the purpose of producing methane from coal. The first part of the dissertation characterized microbial communities dedicated for conversion of coal to methane in situ and ex situ. To enhance methane production in situ in bituminous coal seams, distribution of microorganisms …
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Anaerobic Co-digestion of Wastewater Treatment Pond Algae with Wastewater Sludge
… ammonia concentrations and increase methane production. However, high carbon waste co-substrates have become costly or are not readily available in many communities. Although domestic wastewater sludge has only a marginally higher C:N ratio than algae biomass, sludge is a practical …
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Investigating the effects of pre-treatment of tropical seaweeds and freshwater macrophytes for bioenergy production
… adapted anaerobic fresh sludge produced higher methane in L. digitata 378 ml/g VS added followed by E. crassipies 275 ml/g VS added, P. stratiotes 232 ml/g VS added, and S. fluitans 139 ml/g VS added, respectively. Similar pattern was observed in adapted saline reactors. However, the methane …
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In vitro screening of commercial sorghum hybrids and omega-3 supplementation in Holstein steers
… (r) , and maximum rate of gas production (m). Methane yield was estimated from each in vitro culture, using the VFA concentrations from the in vitro cultures solution using the formula Methane Yield (g/kg DM) = 4.08×(Acetate (mol/100 mol)/Propionate (mol/100 mol) + 7.05 (Williams et al., 2019). …
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Low strength wastewater treatment using emerging anaerobic treatment processes
… the AnMBR. Both the effluent water quality and methane yield were enhanced. Municipal wastewater contains complex organic constituents while multi-step biochemical processes are involved in anaerobic treatment processes. Two identical AnMBR were operated under decreasing HRTs (24 h, 12 h, and 6 …
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Anaerobic Co-digestion of Microalgae with Food Waste and Wastewater Sludge
… wastes. The goal was to produce high methane yields and stable digestion without the need for supplemental alkalinity addition. A key research question was if algae digestion could be improved via the synergistic effects of co-digestion. Cell disruption to increase digestibility was …
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International biogas applications
… energy crops are preferred due to their higher methane yields. Concerns about the sustainability of the use energy crops for biogas production have reduced the use of these substrates worldwide, which has encouraged the research on algae feedstock for AD. In the first part of this thesis, the …
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Advanced anaerobic treatment for energy recovery and improved process economics in the management of biorefinery wastewaters
… was further evaluated to determine potential methane yield, drawing upon a combination of literature-derived values and theoretical calculations. Finally, the results from the wastewater analysis were fed into the developed process model for the chosen anaerobic treatment technology. The …
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Performance of Acid-Gas Anaerobic Digestion for Minimization of Siloxane and Hydrogen Sulfide Produced in Biogas for Energy Recovery
… these compounds volatilize and enter the methane gas recovery stream. As the methane is combusted for energy cogeneration, these compounds become oxidized to microcrystalline silicon dioxide and cause damage and potential failure of expensive infrastructure. Adsorption and other catchment …
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Production of biogas from sugarcane wastes: an assessment of microbial community dynamics for an efficient process
… strategies. Despite the promising results of the methane potential for all the waste products, chemical and physical pre-treatments were applied successfully to increase the methane yield of straw, bagasse and filter cake. The microbial community dynamics observed during co-digestion of filter …
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Optimizing high-rate activated sludge: organic substrate for biological nitrogen removal and energy recovery
… to the measurement of the heterotrophic aerobic yield coefficient and decay rate of the pilot process. The yield coefficient was estimated to be 0.79±0.02 gCOD/gCOD, which was higher than the accepted value of 0.67 g/g. It was speculated that the batch respirometry tests resulted in the aerobic …
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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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Cellulose mineralization in two-stage anaerobic digestion systems
… were examined in both the thermo-meso and acid-methane two-stage systems under different hydraulic retention times (HRTs), feed concentrations and organic loading rates (OLRs). The emphasis of this research was to characterize the similarities and differences between these two processes;The …
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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 silage. …
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Biomethane production from macroalgae
… bio-resource with potentially high specific methane yields. Anaerobic digestion is deemed the most feasible technology due to its commercial viability for handling such wet feedstock. However, the biomethane potential of seaweed is highly dependent on its chemical composition which can vary …
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