TY - CONF
T1 - Ensiling of Sugar Kelp Biomass for Biorefining
AU - Larsen, S.U.
AU - Ma, N.
AU - Denmark, Bruhn
AU - Boderskov, Teis
AU - Macleod, Adrian
AU - Bak, U.G.
AU - Bjerre, A
N1 - ISBN: 978-88-89407-20-2
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PY - 2021
Y1 - 2021
N2 - Seaweeds are generally harvested at certain seasons to obtain optimal yield and quality for specific purposes. Year-round biorefining of seaweed, therefore, requires storage of the biomass from harvest to processing. We investigated ensiling as a method for preserving seaweed biomass for subsequent biorefinery. In lab-scale and pilot-scale experiments of up to one-year duration, sugar kelp (Saccharina latissima) biomass was preserved by either biological ensiling by means of lactic acid bacteria (LAB) fermentation or by chemical ensiling by addition of lactic acid to reduce pH. The results clearly demonstrated that the ensilability of sugar kelp was positively correlated with the glucose content of the biomass. The ensiling process could be optimized by application of molasses and further improved by addition of LAB inoculum. The doses of molasses and lactic acid were important for pH after biological and chemical ensiling, respectively. Biological ensiling reduced the content of glucose and increased the content of fermentation products. In conclusion, ensiling appears to be an interesting preservation method for seaweed biomass, which may be optimized by application of ensiling additives. However, ensiling also changes the chemical composition of the biomass, and the applicability of ensiling for preserving seaweed biomass may depend on the subsequent use of the silage in biorefinery processes.
AB - Seaweeds are generally harvested at certain seasons to obtain optimal yield and quality for specific purposes. Year-round biorefining of seaweed, therefore, requires storage of the biomass from harvest to processing. We investigated ensiling as a method for preserving seaweed biomass for subsequent biorefinery. In lab-scale and pilot-scale experiments of up to one-year duration, sugar kelp (Saccharina latissima) biomass was preserved by either biological ensiling by means of lactic acid bacteria (LAB) fermentation or by chemical ensiling by addition of lactic acid to reduce pH. The results clearly demonstrated that the ensilability of sugar kelp was positively correlated with the glucose content of the biomass. The ensiling process could be optimized by application of molasses and further improved by addition of LAB inoculum. The doses of molasses and lactic acid were important for pH after biological and chemical ensiling, respectively. Biological ensiling reduced the content of glucose and increased the content of fermentation products. In conclusion, ensiling appears to be an interesting preservation method for seaweed biomass, which may be optimized by application of ensiling additives. However, ensiling also changes the chemical composition of the biomass, and the applicability of ensiling for preserving seaweed biomass may depend on the subsequent use of the silage in biorefinery processes.
KW - Macroalgae
KW - storage
KW - fermentation
KW - biorefinery
KW - chemical composition
U2 - 10.5071/28thEUBCE2020-3BO.11.2
DO - 10.5071/28thEUBCE2020-3BO.11.2
M3 - Paper
SP - 531
EP - 536
T2 - 28th European Biomass Conference and Exhibition
Y2 - 6 July 2020 through 9 July 2020
ER -