Mesophilic and thermophilic anaerobic laboratory-scale digestion of Nannochloropsis microalga residues

Microalgae-utilizing biorefinery concept for pulp and paper industry: Converting secondary streams into value-added products

“…Calculated methane yield in lipid-extracted algal residue digestion would be 160 kg t −1 added volatile solids, which is in the range of published experimental results [e.g. 37]. Fertilizer mass flow is linearly dependent on WAS flow rate, but its sensitivity to other parameter variation is low: the flow is only slightly affected by amount of incoming nutrients to digestion.…”

Anaerobic digestion of microalgal biomass: Challenges, opportunities and research needs

“…Nevertheless, the disadvantage of this higher temperature range is related to the high ammonia and VFA levels that are associated with process failure due to possible inhibition of methanogens by these compounds. This is the case for instance ofKinnunen et al, (2014) who compared the anaerobic degradation of Nannochloropsis sp. at thermophilic and mesophilic range.…”

Pre-treatment options for halophytic microalgae and associated methane production

“…was dried for the extraction process and redried after the extraction to remove entrained hexane, it is considered that this excessive drying of biomass could have significantly influenced the bio-methane potential of the substrate, further reducing gas potential. Kinnunen et al (2014) reported a significant decrease in methane potential between dry and wet extracted Nannochloropsis, where wet biomass produced 482 mL per g VS compared to 194 mL per g VS for dry biomass. This reduction in methane clearly illustrates that the processing methods utilised for lipid extraction in microalgae needs to be considered if the residual biomass is targeted for anaerobic digestion.…”