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Title: Anaerobic digestion of Saccharina latissima
Author: Paul, Roshni
ISNI:       0000 0004 8501 5788
Awarding Body: Birmingham City University
Current Institution: Birmingham City University
Date of Award: 2018
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Anaerobic digestion, AD, of brown macroalgae biomass species Saccharina latissima (S. Latissima) was investigated in this research study for its biochemical methane potential in batch and continuous operations, co-digestion performance and technoeconomic feasibility. Environmental conditions of the cultivation site were observed to have a significant effect on the organic and inorganic content of the samples from different locations. For S.Latissima harvested from three different locations, the specific methane production of biomass from Strangford Lough was found to be 0.393 L CH₄/kg VS added, while biomass from Ventry Harbour had a methane production of 0.391 L CH₄/kg VS added. The lowest of the specific methane production was shown for the biomass from Isle of Seil with a value of 0.265 L CH₄/kg VS added. Growth cycle of the macroalgae was found an important indicator to optimise harvest times to target highest storage carbohydrates in the biomass. Highest methane production was obtained for summer biomass which showed highest carbon percentages and C/N ratios. Biomass characteristics of wild and cultivated S. Latissima was found to be significantly different. The specific methane potential of the macroalgae biomass exhibited an inverse relationship with the volatile solids and ash content. Co-digestion with S. Latissima in a 70:30 ratio resulted in higher rates of methane production and methane yields. Co-digestion of wheat and sugar beet - vegetable mix was found synergistic with S. Latissima with a specific methane production of 0.472 and 0.373 L CH₄/kg VS added however antagonistic with pig manure with methane production of 0.172 L CH₄/kg VS added. The net percentage increase observed for wheat was 21.59%, and 15.95% of SBV mix however a decrease of -17.43% for pig manure while co-digested with S. Latissima. Semi-continuous digestion experiments showed that mesophilic temperatures were more stable with higher gas production while thermophilic digesters had higher volatile solids destruction. In the case of S. Latissima macroalgae biomass, addition of trace element solution only enhanced the methane concentrations in the biogas production. In the techno economic analysis, AD of S. Latissima as a monodigestion feedstock was found to be economically not feasible due to the high price of the macroalgae biomass. However co-digestion with sugar beet - vegetable mix with a gate fee of 29 Euros per tonne was found to be economically feasible with macroalgae biomass priced at 50 Euros per tonne.
Supervisor: Melville, L. ; Suhartini, S. ; Sulu, M. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: C700 Molecular Biology, Biophysics and Biochemistry