• Malthe Fredsgaard
  • Laura Sini Sofia Hulkko
4. semester, Bæredygtig Energiteknik, Kandidat (Kandidatuddannelse)
Salt-tolerant succulent halophyte S. dolichostachya is characterised to evaluate its suitability to biorefinery in different stages of plant growth, as the soil salinisation has seen as a major agricultural issue and the worlds biofuel demand is increasing. The green fractionation approach is chosen, where the liquid and solid fractions of the biomass are considered separately. Soxhlet extractions are used to separate different biochemical groups from the pulp, and the lignocellulosic residue is fed to black soldier fly larvae (BSFL) for sugars-to lipids conversion. The ASTM approved route of hydroprocessed esters and fatty acids is applied in in silico study of processing BSFL lipids to sustainable jet fuel. The fractionation shows biomass consisting 47-69 w% green juice and 28-48 w% pulp. Up to 62 w% of the pulp dry matter (DM) is lignocellulose, and the ash content is also relatively high, due to accumulation of salts to halophyte tissues. Results show, that 12-14 w% of total DM is covered by protein. The total lipid content is low, but increases over time when plant produces seeds. Feed trials show, that up to 40 w% of the traditional BSFL feed can be replaced with S. dolichostachya biomass with only small effects in the growth, yielding 38 w% lipid content of BSFL. Simulation and techno-economic analysis show, that with the applied process routes, inputs and production rates, the jet fuel production will be profitable only with large fresh biomass input and applied pretreatment. Anotherwise, the process will not be profitable due to high operational costs. Therefore, further research and optimisation studies are needed to evaluate the suitability of S. dolichostachya feedstock and sugars-to-lipids conversion method to biorefinery and liquid fuel production more accurately and in an aim to develop a robust biorefinery process.
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ID: 333161907