Techno-economic assessment of subcritical water hydrolysis process for sugars production from brewer's spent grains

Author(s)

Sganzerla, William Gustavo ^[1] ; Zabot, Giovani Leone ^[2] ; Torres-Mayanga, Paulo Cesar ^[3] ; Buller, Luz Selene ^[1] ; Mussatto, I, Solange ; Forster-Carneiro, Tania ^[1]

Affiliation

^[1] Univ Campinas UNICAMP, Sch Food Engn FEA, Monteiro Lobato St 80, BR-13083862 Campinas, SP - Brazil

^[2] Fed Univ Santa Maria UFSM, Lab Agroind Proc Engn LAPE, Sete Setembro St, BR-96508010 Cachoeira Do Sul, RS - Brazil

^[3] Natl Univ Barranca, Profess Sch Engn Food Ind, Dept Engn, Lima - Peru

• Document type: Journal article
• Source: INDUSTRIAL CROPS AND PRODUCTS; v. 171, NOV 1 2021.
• Web of Science Citations: 1

Abstract

Breweries generate a high amount of brewer's spent grains (BSG), which is a valuable feedstock for industrial applications. In the current study, a techno-economic assessment of the flow-through subcritical water hydrolysis reactor to produce sugars from BSG was performed. Simulations were done for a sequential hydrolysis process in three-extractor vessels of 10 L (pilot-plant) and 500 L (industrial-plant), coupled or not to a separation system. The sugar separation system was composed of a five-zone simulated moving bed (SMB) process. A study on the cost of manufacturing (COM), profitability indicators, and sensitivity analysis was conducted to verify the project feasibility. Moreover, the mass and energy balance of the industrial process was accomplished to evidence the main operational parameters. Simulation results indicated that the scale-up process from pilot to industrial scale reduced the COM by approximately 80 %. In the process coupled with the SMB separation system, arabinose and galactose represented 83.68 % of the costs for sugars separation. Arabinose COM decreased from 64.10 USD kg(-1) pilot-plant to 7.22 USD kg(-1) in industrial-plant. The implementation of a separation system recovering six sugars with high added-value can be an advantage in the industrial-plant process when comparing to the process without SMB process, which produces a single hydrolysate fraction with low commercial value. Finally, the integrated subcritical water hydrolysis of BSG coupled with a separation system can be a promising alternative to produce different concentrated sugars in a biorefinery concept. (AU)

• FAPESP's process: 18/05999-0 - Waste2energy: integration of the supercritical and anaerobic digestion technologies for the management of water and food waste
• Grantee: Tânia Forster Carneiro
• Support Opportunities: Regular Research Grants
• FAPESP's process: 20/10323-5 - Life cycle and technical-financial assessment of the integration of anaerobic digestion and hydrothermal technologies for waste recovery
• Grantee: Luz Selene Buller
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 18/14938-4 - Waste2energy: integration of supercritical technologies and anaerobic digestion through an automated system for the production of biofuel precursors
• Grantee: Tânia Forster Carneiro
• Support Opportunities: Research Grants - Young Investigators Grants - Phase 2
• FAPESP's process: 19/26925-7 - Development of an automated system for biofuel precursor production using sub-critical technology
• Grantee: William Gustavo Sganzerla
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)