Mitigation of variable seasonal productivity in algae biomass through blending and ensiling: An assessment of compositional changes in storage

Wahlen, Bradley D.; Wendt, Lynn M.; Murphy, J. Austin; Seibel, Fábio

doi:10.1016/j.algal.2019.101584

Cited by 14 publications

(21 citation statements)

References 36 publications

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“…The moisture contents of initial and stored materials were determined gravimetrically by drying representative samples at 105 °C until reaching a constant weight. The mass of the algal biomass samples before and after storage were measured and dry matter loss was estimated as percentage of the initial materials using equation (1).…”

Section: Wet Anaerobic Storagementioning

confidence: 99%

“…Algal biomass is a versatile, viable, and sustainable biomass feedstock. This is due to its high biomass productivity, biochemical composition, ability to be cultivated on marginal lands, and utilization of non-potable water resources and carbon dioxide emitted from fossil fuel-based power plants [1][2][3]. Its biochemical composition (comprising of carbohydrate, protein, and lipid) has made it a suitable feedstock for conversion into a wide range of biofuels and bioproducts.…”

Section: Introductionmentioning

confidence: 99%

“…Wendt et al [9] explained that even though cultivation and production of algal biomass occurs throughout the year across various geographical locations, seasonal decrease in temperature and solar irradiation negatively impact growth rate and yield, preventing constant conversion throughput. To mitigate the seasonal variation in algal biomass productivity and ensure continuous feedstock supply to the biorefinery while maintaining dry matter stability and minimal change in biochemical composition, various preservation techniques such as drying, freezing, pasteurization, blending, and wet anaerobic storage have been explored and reported in literature [1,8,9,11].…”

Section: Introductionmentioning

confidence: 99%

“…They undergo homolactic (lactic acid only) or heterolactic (acetic and lactic acids) fermentation of algal sugars to produce organic acids. The reduced pH along with the presence of the organic acids limits the microbial activities of mold, yeast, and clostridia associated with biomass degradation [1,14].…”

Section: Introductionmentioning

confidence: 99%

“…The effectiveness of wet anaerobic storage in preserving biochemical composition and dry matter content of algal biomass can be fully evaluated when this storage approach is utilized for various algae strains and the results are consistent. Previous work by the authors have focused on wet anaerobic storage of freshwater algae strains (S. obliquus, S. acutus), algae blended with yard waste and corn stover [1,2,15,16]. However, this study is investigating the wet anaerobic storage of a saline algae strain and the results from this study will contribute to the development of a holistic understanding of the effectiveness of wet anaerobic storage in preserving algal biomass feedstocks.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Inoculation with Lactic Acid Bacteria on the Preservation of Nannochloropsis Gaditana Biomass in Wet Anaerobic Storage and Its Impact on Biomass Quality

Oginni¹,

Wahlen²,

Wendt³

et al. 2022

Preprint

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Wet anaerobic storage of algal biomass is a promising preservation approach which can ensure continuous supply of these feedstocks to biorefineries year-round. An effective solution to preservation must ensure minimal dry matter loss and change in biochemical composition during storage. Therefore, the objective of this study was to investigate the preservation of Nannochloropsis gaditana biomass through wet anaerobic storage and its impact on biomass quality. Prior to storage, algae sample was inoculated with two different strains of lactic acid bacteria and thereafter stored for 30 and 180 days. Each inoculant limited dry matter loss to &lt;10% (dry basis) after the storage durations. Final pH values (4.3 - 4.8) indicate that the biomass samples were properly ensiled, achieving the acidic conditions necessary for preservation. Compositional analysis of the biomass after storage showed a reduction in carbohydrate content, a relative increase in lipid content, and no significant change to the protein fraction. Glucose and galactose were the prevalent sugar monomers. The low dry matter loss and minimal compositional change indicates that wet anaerobic storage is an effective means of preserving algal biomass, ensuring a constant supply of algal biomass feedstock to a biorefinery.

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Section: Wet Anaerobic Storagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%