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Biorefinery Optimization Workshop Summary Report

The U.S. Department of Energy’s (DOE’s) Bioenergy Technologies Office (BETO) hosted a workshop on October 5–6, 2016, to gather stakeholder inputs and opinions on integrated biorefinery (IBR) development and optimization issues. More than 100 bioenergy industry stakeholders, representing public and private sector organizations, national laboratories, and academic institutions, participated in the Biorefinery Optimization Workshop. Workshop topics covered three areas of primary focus, including (1) feedstock and solid materials handling; (2) process scale-up, intensification, and cost reduction; and (3) co-product and waste stream monetization. Day one of the workshop featured a morning plenary session where key industry leaders presented on topics relevant to the IBR technology development community. In the afternoon, three concurrent breakout sessions focused on one of the three workshop topics. On the second day of the workshop, all three breakout sessions addressed the topics of stakeholder collaboration and BETO’s role in addressing biorefinery optimization challenges.

09 BIOMASS FUELS↗

Aqueous-phase product treatment and monetization options of wet waste hydrothermal liquefaction: Comprehensive techno-economic and life-cycle GHG emission assessment unveiling research opportunities

While wet waste hydrothermal liquefaction technology has a high biofuel yield, a significant amount of the carbon and nitrogen in the feedstock reports to the aqueous-phase product. Pretreatment of this stream before sending to a conventional wastewater plant is essential or at the very least, advisable. In this work, techno-economic and life-cycle assessments were conducted for the state-of-technology baseline and four aqueous-phase product treatment and monetization options based on experimental data. Further, these options can cut minimum fuel selling prices by up to 13 % and life-cycle greenhouse gas emissions by up to 39 % compared to the baseline. These findings highlight the substantial influence of aqueous produce treatment strategies on the entire wet waste hydrothermal liquefaction process, demonstrating the potential for optimizing economic viability and environmental impact through further research and development of milder treatment methods and diversified by-product valorization pathways.

09 BIOMASS FUELS↗