Effects of thermal pretreatment on anaerobic digestion of Nannochloropsis salina biomass

Prospects for methane production and nutrient recycling from lipid extracted residues and whole Nannochloropsis salina using anaerobic digestion

“…While the effect of microwave treatment on semi-continuous AD was not reported before, a similar improvement was achieved for Nannochloropsis when using thermal (at 120°C) or microwave treatments followed by batch digestion (up to 30-100% increase in methane yield) [31,68] and for mixed Scenedesmus/Chlorella biomass (up to 27-75% increase) [26]. Also, thermal treatment at 90-120°C significantly improved lipid extraction efficiency [69] showing that it might be applied to lipid recovery followed by AD of the LEA.…”

Acutodesmus obliquus as a benchmark strain for evaluating methane production from microalgae: Influence of different storage and pretreatment methods on biogas yield

“…Thermal pretreatment at 100°C for 60 min was previously shown to be a proper method for enhancing CH 4 yields [42]. We used an ULTRAClave microwave with the following settings: heating for 14 min at 40 bar to finally reach 100°C (T 100 ) and temperature maintained constant for 60 min.…”

Density of biogas digestate depending on temperature and composition

“…Samples for the density measurements were taken after 245 days of the semi-continuous digestion. Further details on the set up and configuration of the fermenters, the feedstocks and the feeding intervals can be found at Schwede et al (2013aSchwede et al ( , 2013b.…”

“…Three different biogas digestates were chosen for the experiments, which originated from anaerobic, semi-continuous experiments carried out by Schwede et al (2013a), Schwede et al (2013b). As inoculum biogas digestate from an agricultural biogas plant was used in both studies, which was operated with corn silage and cattle dung as feedstock.…”

“…As inoculum biogas digestate from an agricultural biogas plant was used in both studies, which was operated with corn silage and cattle dung as feedstock. During the experiments of Schwede et al (2013b) the fermenter was fed with biomass from the marine microalga Nannochloropsis salina (A). For the study of Schwede et al (2013a) one fermenter was fed with corn silage (CS) and a second fermenter was fed with a mixture of algal biomass and corn silage in a ratio of 1:6 based on fresh matter (A + CS).…”