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Optimization of Dilute Acid Pretreatment and Enzymatic Hydrolysis of Phalaris aquatica L. Lignocellulosic Biomass in Batch and Fed-Batch Processes

Karapatsia, Anna, Pappas, Ioannis, Penloglou, Giannis, Kotrotsiou, Olympia, Kiparissides, Costas
BioEnergy research 2017 v.10 no.1 pp. 225-236
Phalaris aquatica, Taguchi method, biomass, cellulose, enzymatic hydrolysis, glucose, grasses, hemicellulose, hydrolysis, lignin, lignocellulose, particle size, perennials, saccharification
Phalaris aquatica L., a rich in holocellulose (69.80 %) and deficient in lignin (6.70 %) herbaceous, perennial grass species, was utilized in a two-step (biomass pretreatment-enzymatic hydrolysis) saccharification process for sugars recovery. The Taguchi methodology was employed to determine the dilute acid pretreatment and enzymatic hydrolysis conditions that optimized hemicellulose conversion (75.04 %), minimized the production of inhibitory compounds (1.41 g/L), and maximized the cellulose to glucose yield (69.69 %) of mixed particulate biomass (particles <1000 μm) under batch conditions. The effect of biomass particle size on saccharification process efficiency was also investigated. It was found that small-size biomass particles (53–106 μm) resulted in maximum hemicellulose conversion (81.12 %) and cellulose to glucose yield (93.24 %). The determined optimal conditions were then applied to a combined batch pretreatment process followed by a fed-batch enzymatic hydrolysis process that maximized glucose concentration (62.24 g/L) and yield (92.48 %). The overall efficiency of the saccharification process was 88.13 %.