title: Efficient anaerobic digestion of whole microalgae and lipid-extracted microalgae residues for methane energy production.
abstract: The primary aim of this study was to completely investigate extensive biological methane potential (BMP) on both whole microalgae and its lipid-extracted biomass residues with various degrees of biomass pretreatment. Specific methane productivities (SMP) under batch conditions for non-lipid extracted biomass were better than lipid-extracted biomass residues and exhibited no signs of ammonia or carbon/nitrogen (C/N) ratio inhibition when digested at high I/S ratio (I/S ratio⩾1.0). SMP for suitably extracted biomass ranged from 0.30 to 0.38LCH4/gVS (volatile solids). For both whole and lipid-extracted biomass, overall organic conversion ranged from 59.33 to 78.50 as a measure of %VS reduction with greater percentage biodegradability in general found within the lipid-extracted biomass. Higher production levels correlated to lipid content with a linear relationship between SMP and ash-free lipid content being developed at a R(2) of 0.814.
authors.affiliation: Biological Systems Engineering, Washington State University, Pullman, WA 99164, USA; Graduate School, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
authors.forename: Baisuo
authors.initials: B
authors.lastname: Zhao
authors.affiliation: Biological Systems Engineering, Washington State University, Pullman, WA 99164, USA.
authors.forename: Jingwei
authors.initials: J
authors.lastname: Ma
authors.affiliation: Biological Systems Engineering, Washington State University, Pullman, WA 99164, USA.
authors.forename: Quanbao
authors.initials: Q
authors.lastname: Zhao
authors.affiliation: National Renewable Energy Laboratory, Golden, CO 80401-3305, USA.
authors.forename: Lieve
authors.initials: L
authors.lastname: Laurens
authors.affiliation: National Renewable Energy Laboratory, Golden, CO 80401-3305, USA.
authors.forename: Eric
authors.initials: E
authors.lastname: Jarvis
authors.affiliation: Biological Systems Engineering, Washington State University, Pullman, WA 99164, USA.
authors.forename: Shulin
authors.initials: S
authors.lastname: Chen
authors.affiliation: Biological Systems Engineering, Washington State University, Pullman, WA 99164, USA. Electronic address: cfrear@wsu.edu.
authors.forename: Craig
authors.initials: C
authors.lastname: Frear
mesh_terms: D000693:Anaerobiosis; D056804:Biofuels; D018533:Biomass; D008697:Methane; D058086:Microalgae / Q000737:chemistry*
chemical_list: D056804:Biofuels; D008697:Methane
keywords: Anaerobic digestion; Lipid-extracted microalgae residues; Methane production; Microalgae