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Biomass and Bioenergy
Volume 137, 2020, 105555

Integrated consolidated bioprocessing for simultaneous production of Omega-3 fatty acids and bioethanol

Nisha Singha,c, Adarsha Guptab, Anshu S.Mathurc, Colin Barrowa, Munish Puria,b

Centre for Chemistry and Biotechnology, School of Life and Environmental Sciences, Deakin University, Waurn Ponds, Geelong, 3217, Australia.

Abstract

Lignocellulosic biomass represents a promising feedstock for supplying biofuels and other useful bioproducts in near future. As an example of process innovation, this study describes an integrated microbial fermentation process involving a thermoanaerobe and a marine thraustochytrid, aiming at the co-production of docosahexaenoic acids and bioethanol from rice straw biomass as substrate. Key points of the process are: (a) consolidated bioprocessing of pretreated rice straw biomass to bioethanol (anaerobic fermentation) resulting into 1.8 g L-1 bioethanol and 29.40% solubilization of rice straw biomass; (b) utilization of spent lignocellulose derived sugars in microalgal fermentation (aerobic fermentation) with subsequent promising cell growth (2.77 g L-1), substantial lipids (17.05%) and docosahexaenoic acids production (44.0% of total fatty acids). Other major fatty acids (as total fatty acid %) were palmitic acid (13.95%), stearic acid (5.07%), eicosapentaenoic acid (7.24%), and docosapentaenoic acid (16.12%). This study provides a new route for marine algae utilization of lignocellulosic biomass for co-production of bioethanol and value-added bioproducts.

Keywords: Biofuels, Biorefinery, DHA/EPA, Marine, PUFAs, Thermophiles, Lignocellulosic biomass.

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