Comparison of extraction techniques for product diversification in a supercritical water gasification-based sugarcane-wet microalgae biorefinery: Thermoeconomic and environmental analysis

Author(s)

Albarelli, Juliana Q. ^{[1, 2]} ; Santos, Diego T. ^{[1, 2]} ; Ensinas, V, Adriano ; Marechal, Francois ^[3] ; Cocero, Maria J. ^[2] ; Meireles, M. Angela A. ^[1]

Affiliation

^[1] Univ Estadual Campinas, UNICAMP, Sch Food Engn, LASEFI, DEA, FEA, Cidade Univ Zeferino Vaz, Rua Monteiro Lobato 80, BR-13083862 Campinas, SP - Brazil

^[2] Univ Valladolid, Dept Chem Engn & Environm Technol, High Pressure Proc Grp, Doctor Mergelina S-N, E-47005 Valladolid - Spain

^[3] EPFL, IPESE, CH-195 Sion - Switzerland

• Document type: Journal article
• Source: JOURNAL OF CLEANER PRODUCTION; v. 201, p. 697-705, NOV 10 2018.
• Web of Science Citations: 3

Abstract

This study presents a thermoeconomic and environmental assessment of the extraction of lipids and proteins from wet microalgal biomass in a 3G biorefinery by two different technologies: supercritical fluid extraction (SFE) and low-pressure solvent extraction (LPSE). Simulation tools were used to study a sugarcane biorefinery producing ethanol from sugarcane juice (1G) and bagasse (2G); the microalgal growth in an open pond; and the processing of microalgal biomass into lipids, proteins and synthetic natural gas (SNG). Supercritical water gasification (SONG) of microalgal biomass enables an increase in biofuel production of 10.2% MJ when no extraction process is considered and of 1.9% MJ when LPSE is considered. The heat demand of the proposed biorefinery with LPSE was increased by 87.8% compared with the demand of the sugarcane biorefinery without microalgal growth and processing. When the SFE process is considered, the heat demand of the overall process increased 3.2 times. SFE for wet microalgae processing is not economically attractive, as it increases the total investment by 71%. The CO2 flow used in the SFE process demonstrated to be a key factor in the thermoeconomic viability of the process. Regarding the wet processing of microalgae prior to SCWG, the best alternative studied was the use of LPSE technology. (C) 2018 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 15/13299-0 - From seeds to final products: feasible manufacturing routes of annatto applying process intensification and process integration
• Grantee: Maria Angela de Almeida Meireles Petenate
• Support Opportunities: Regular Research Grants
• FAPESP's process: 15/06954-1 - Development of an energetic self-sufficient and economically viable integrated sub/supercritical fluid-based biorefinery by the aid of computational modeling and simulation
• Grantee: Juliana Queiroz Albarelli
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• FAPESP's process: 13/18114-2 - Integral utilization of biomasses using sub/supercritical fluids: environmental, energetic and economic assessment of technological scenarios
• Grantee: Juliana Queiroz Albarelli
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 12/10685-8 - Combination and coupling of processes for the production and encapsulation of value-added vegetal extracts: technical and economic evaluation
• Grantee: Maria Angela de Almeida Meireles Petenate
• Support Opportunities: Regular Research Grants