Integrated consolidated bioprocessing for simultaneous production of Omega-3 fatty acids and bioethanol. (June 2020)

• Record Type: Journal Article
• Authors: Singh, Nisha; Gupta, Adarsha; Mathur, Anshu S.; Barrow, Colin; Puri, Munish
• Is Part Of: Biomass and bioenergy. Volume 137(2020)
• Publication Date: 2020-06
• Subjects: Biofuels -- Biorefinery -- DHA/EPA -- Marine -- PUFAs -- Thermophiles -- Lignocellulosic biomass; Biomass energy -- Periodicals; Biomass -- Periodicals; Energy-Generating Resources -- Periodicals; Bioénergie -- Périodiques; 333.9539
• DOI: 10.1016/j.biombioe.2020.105555
• Languages: English
• ISSNs: 0961-9534

Abstract

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. Highlights: Consolidated bioprocessing of rice straw biomass for bioethanol production. Use of spent microbial broth for DHA production. No exogenous enzyme was added during biomass saccharification. Process integration for effective biomass valorization and omega-3 fatty acids production.