Anaerobic digestion of lipid-extracted Auxenochlorella protothecoides biomass for methane generation and nutrient recovery

Bioresource Technology
Pavlo BohutskyiEdward J Bouwer

Abstract

This study evaluated methane production and nutrient recovery from industrially produced, lipid extracted algal biomass (LEA) of Auxenochlorella protothecoides using semi-continuous anaerobic digestion (AD) at different organic loading rates (OLRs) and hydraulic retention times (HRTs). It was shown, that AD can improve biofuel production efficiency and sustainability, especially for scaled processes, through up to 30% increase in energy generation (up to 0.25 L of methane per g of LEA volatile solids) and partial nutrient recovery and recycling. The nutrient recycling with the AD effluent may reduce the cost of the supplied fertilizers by up to 45%. However, methane production was limited to nearly 50% of theoretical maxima potentially due to biomass recalcitrance and inhibition effects from the residual solvent in the LEA. Therefore, further AD optimization is required to maximize methane yield and nutrient recovery as well as investigation and elimination of inhibition from solvent residues.

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Citations

May 11, 2016·Bioresource Technology·Rahulkumar MauryaSandhya Mishra
Oct 14, 2016·International Journal of Molecular Sciences·Luca ZulianiMatteo Ballottari
Jan 4, 2017·International Journal of Molecular Sciences·Junping LvShulian Xie
Jul 6, 2017·International Journal of Molecular Sciences·Krystian MiazekDorothee Goffin
Jun 27, 2021·Environmental Science and Pollution Research International·Faiz Ahmad AnsariFaizal Bux

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