Abstract
Abstract While the recovery of nutrients (nitrogen and phosphorus) from anaerobic digestion (AD) of lipid-extracted microalgae biomass has been suggested to increase microalgae biofuel sustainability, most studies use assumed biogas and nutrient recovery values that do not take into consideration how microalgae speciation and biomass composition may affect these recovery values. This study is among the first to examine how microalgae speciation and biomass composition influence the recovery of biogas and nutrients from the AD of lipid-extracted microalgae. Batch AD of lipid-extracted Chlorella vulgaris (a model freshwater microalgae) and lipid-extracted Cyclotella sp. (a model marine diatomic microalgae with a high silica composition) resulted in similar 30-day biogas yields of 0.37 ± 0.02 L-biogas/g-microalgaeVS and 0.38 ± 0.02 L-biogas/g-microalgaeVS, respectively. However, biogas production rates varied significantly between species with lipid-extracted Cyclotella producing 79% ± 1% of its biogas withi...
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